Title of invention: Member and vehicle frame
Technical field
[0001]
　The present invention relates to members and vehicle skeletons. The present application claims priority based on Japanese Patent Application No. 2018-205024 filed in Japan on October 31, 2018, the contents of which are incorporated herein by reference.
Background technology
[0002]
　Conventionally, Patent Document 1 below describes a laser welded lap joint between high-strength steel plates. Further, Patent Document 2 below describes a technique assuming that different deformation modes are set without complicatedly combining reinforcing steel plates.
Prior art literature
Patent documents
[0003]
Patent Document 1: Japanese Patent No. 6203647 Japanese Patent
Document 2: Japanese Patent No. 6049146
Outline of the invention
Problems to be solved by the invention
[0004]
　In order to further reduce the weight of the vehicle, for example, the thickness of the structural member is increased by increasing the thickness of the portion where high strength is required and reducing the thickness of the portion where high strength is not required. Is desirable. A differential thickness blank is known as a technique for realizing a differential thickness of structural members. As a technique related to the differential thickness blank, there are techniques such as TRB (Taillor Rolled Blank) and TWB (Taillor Welded Blank).
[0005]
　TRB is a technique for manufacturing a differential thickness blank by producing a difference thickness only in the rolling direction, but the direction in which the thickness is changed is limited to the rolling direction. Therefore, the thickness cannot be changed except in the rolling direction, and it is difficult to freely design the plate thickness.
[0006]
　Further, TWB is a technique for manufacturing a differential thickness blank by arranging plate materials having different thicknesses and welding end faces corresponding to the contour lines of the plate materials. In TWB, from the viewpoint of ease of welding and the like, the end faces of straight lines are often welded to each other, and the welding line is a straight line. Therefore, it is difficult to freely design the plate thickness for each plane region.
[0007]
　Therefore, for example, as described in Patent Document 1 and Patent Document 2, it is conceivable to change the plate thickness for each region by joining the surfaces of a plurality of plate materials (for example, two plate materials). .. However, the technique described in Patent Document 1 is used for joint applications by laser welding high-strength steel plates to each other, and is not intended for free blank thickness design. In addition, since it is used for joints, the direction in which the load is applied is assumed to be perpendicular to the welding line.
[0008]
　Further, the technique described in Patent Document 2 is a technique assuming that the deformation mode is controlled by laminating plate materials, and a plurality of plate materials are joined to exhibit the same strength as one plate. It is not a technology that assumes.
[0009]
　Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to satisfy both the requirements for improvement of collision safety and weight reduction by realizing free difference thickness. It is to provide new and improved components and vehicle skeletons capable of.
Means to solve problems
[0010]
　In order to solve the above problems, the present disclosure employs the following means.
(1) The member according to the first aspect of the present disclosure includes a first plate material, a second plate material, a first joint line portion, a second joint line portion, and a third joint line portion. The plate thickness of the first plate material is equal to or less than the plate thickness of the second plate material, the first plate material and the second plate material are superposed, and the first joint line portion and the first plate material are overlapped. The second joint line portion and the third joint line portion join the first plate material and the second plate material at the interface, respectively, and the first joint line portion is connected to the second joint line portion. The shortest in-plane distance is 20 times or more and 120 times or less the plate thickness of the first plate material, and the second joint line portion has the shortest in-plane distance from the first joint line portion. A portion B having a plate thickness of 20 times or more and 120 times or less the plate thickness of the first plate material is provided, and the third joint line portion is in a first region sandwiched between the A portion and the B portion, and the first The length of the length component in the extending direction of the intermediate line between the first joint line portion and the second joint line portion of the third joint line portion in the region is 250 mm or more.
(2) In the embodiment described in (1) above, the third joint line portion is the first region, and the first joint line portion and the first joint line portion are formed on a straight line orthogonal to the intermediate line. It may be in the second region within 20% of the distance between the first joint line portion and the second joint line portion from the midpoint with the second joint line portion.
(3) In the embodiment described in (2) above, the extension of the intermediate line between the first joint line portion and the second joint line portion of the third joint line portion in the second region. The continuous length of the length component in the direction may be 250 mm or more.
(4) In the embodiment according to any one of (1) to (3) above, the third joint line portion is the first region, and the first joint line portion to the first. It may be in the third region which is 40 times or less the plate thickness of the plate material of 1.
(5) In the embodiment described in (4) above, the extension of the intermediate line between the first joint line portion and the second joint line portion of the third joint line portion in the third region. The continuous length of the length component in the existing direction may be 250 mm or more.
(6) The vehicle skeleton according to the second aspect of the present disclosure is a vehicle skeleton provided with the member according to any one of (1) to (5) above, and has a first ridgeline portion and a second. The top wall portion is located between the first ridge line portion and the second ridge line portion, and the first joint line portion and the second joint line portion are provided. The third joint line portion is located on the top wall portion, and the top wall portion is arranged so as to be on the outside of the vehicle.
(7) The member according to the third aspect of the present disclosure includes a first plate material, a second plate material, a first joint line portion, a third joint line portion, a first ridge line portion, and the like. The plate thickness of the first plate material is equal to or less than the plate thickness of the second plate material, and in the first ridge line portion, the first joint line portion, and the third joint line portion, the first The first plate material and the second plate material are superposed, and the first joint line portion and the third joint line portion respectively join the first plate material and the second plate material at an interface, and the first plate material and the second plate material are joined. The joint line portion 1 includes an A portion whose shortest in-plane distance from the first ridge line portion is 20 times or more and 120 times or less the plate thickness of the first plate material, and the first ridge line portion is the said. The shortest in-plane distance from the first joint line portion includes a B portion having a plate thickness of 20 times or more and 120 times or less of the plate thickness of the first plate material, and the third joint line portion is formed on the A portion and the B portion. The length in the extending direction of the intermediate line between the first joint line portion and the first ridge line portion of the third joint line portion in the sandwiched first region. The length of the component is 250 mm or more.
(8) In the embodiment described in (7) above, the third junction line portion is the first region, and on a straight line orthogonal to the intermediate line, the first junction line portion and the said It may be in the second region within 20% of the distance between the first joint line portion and the first ridge line portion from the midpoint with the first ridge line portion.
(9) In the embodiment described in (8) above, the extending direction of the intermediate line between the first joint line portion and the first ridge line portion of the third joint line portion in the second region. The continuous length of the length component of is 250 mm or more.
(10) In the embodiment according to any one of (7) to (9) above, the third junction line portion is the first region, and the first junction line portion to the first. It may be in the third region which is 40 times or less the plate thickness of the plate material of 1.
(11) In the embodiment described in (10) above, the extension of the intermediate line between the first joint line portion and the first ridge line portion of the third joint line portion in the third region. The continuous length of the length component in the direction may be 250 mm or more.
(12) In the embodiment according to any one of (7) to (11) above, the third junction line portion is the first region, and the first ridge line portion to the first. It may be in the fourth region which is 40 times or less the plate thickness of the plate material of.
(13) In the embodiment described in (12) above, the extension of the intermediate line between the first joint line portion and the first ridge line portion of the third joint line portion in the fourth region. The continuous length of the length component in the direction may be 250 mm or more.
(14) In the embodiment according to any one of (7) to (13) above, all the ends of the first plate material may be inside the second plate material.
(15) In the embodiment according to any one of (7) to (14) above, all the ends of the second plate material may be inside the first plate material.
(16) In the embodiment according to any one of (1) to (5) and (7) to (15), the first joint line portion is formed along the longitudinal direction of the first plate material. It may be provided.
(17) In the embodiment according to any one of (1) to (5) and (7) to (15), the first joint line portion is formed along the longitudinal direction of the second plate material. It may be provided.
(18) The vehicle skeleton according to the fourth aspect of the present disclosure is a vehicle skeleton provided with the member according to any one of (7) to (13) above, and has a second ridgeline portion and a top wall. The top wall portion is located between the first ridge line portion and the second ridge line portion, and the first joint line portion and the third joint line portion are on the top wall portion. Yes, the top wall is arranged so as to be on the outside of the vehicle.
(19) In the embodiment described in (18) above, the first plate material and the second plate material may be overlapped with each other at the second ridge line portion.
(20) The vehicle skeleton according to the fifth aspect of the present disclosure is a vehicle skeleton which is a hat-shaped member, and is a first member, a second member, a fourth joint line portion, and a first. A ridge line portion and a second ridge line portion are provided, and the plate thickness of the first member is equal to or less than the plate thickness of the second member. The first member and the second member are superposed, the first member has a top wall portion extending in the longitudinal direction of the hat-shaped member, and the second member has a top wall portion extending in the longitudinal direction of the hat-shaped member. The first ridgeline portion has an extending top wall portion, and the top wall portion of the first member and one end of the top wall portion of the second member, the first member and the second member. The second ridgeline portion is a ridgeline portion on which the members of the above members are overlapped, and the second ridgeline portion is the first member of the top wall portion of the first member and the other end of the top wall portion of the second member. And the second member are overlapped with each other, and the first ridge line portion, the second ridge line portion, and the fourth joint line portion are the first member and the second member. The first ridge line portion includes a C portion whose shortest in-plane distance from the second ridge line portion is 20 times or more and 120 times or less the plate thickness of the first member. The second ridge line portion includes a D portion whose shortest in-plane distance from the first ridge line portion is 20 times or more and 120 times or less the plate thickness of the first member, and the fourth joint line portion is the said. An intermediate line between the first ridge line portion and the second ridge line portion of the fourth joint line portion in the fifth region located in the fifth region sandwiched between the C portion and the D portion. The continuous length of the length component in the extending direction is 250 mm or more, and the top wall portion of the first member and the top wall portion of the second member are arranged so as to be on the outside of the vehicle. Will be done.
(21) In the embodiment described in (20) above, the fourth junction line portion is the fifth region, and the first ridge line portion and the first ridge line portion are on a straight line orthogonal to the intermediate line. It may be in the sixth region within 20% of the distance between the first ridgeline portion and the second ridgeline portion from the midpoint between the two ridgeline portions.
(22) In the embodiment described in (21) above, in the extending direction of the intermediate line between the first ridge line portion and the second ridge line portion of the fourth joint line portion in the sixth region. The continuous length of the length component may be 250 mm or more.
(23) In the embodiment according to any one of (20) to (22) above, the fourth junction line portion is the fifth region, and the first from the first ridge line portion. It may be in the seventh region which is 40 times or less the plate thickness of the member of.
(24) In the embodiment described in (23) above, the extending direction of the intermediate line between the first ridge line portion and the second ridge line portion of the fourth joint line portion in the fifth region. The continuous length of the length component of is 250 mm or more.
Effect of the invention
[0011]
　According to the present invention, it is possible to provide a member and a vehicle skeleton capable of satisfying both the requirements for improvement of collision safety and weight reduction by realizing free thickness difference.
A brief description of the drawing
[0012]
FIG. 1 is a schematic view showing a state in which the B pillar is viewed from the side of the vehicle.
FIG. 2 is a perspective view showing a structure of a blank according to an embodiment of the present invention.
FIG. 3A is a schematic view showing a line welding joint line 200 for welding a first plate material and a second plate material of the same embodiment.
FIG. 3B is a schematic view showing a joint line of line welding for welding a first plate material and a second plate material of the same embodiment.
FIG. 3C is a schematic view showing a joint line of line welding for welding a first plate material and a second plate material of the same embodiment.
[Fig. 4] Fig. 4 is a diagram showing the effect of the number of joint lines on the initial reaction force.
FIG. 5 is a characteristic diagram showing the relationship between the ratio of the plate width W 0 to the plate thickness t (W 0 / t) and the effective width of the plate material.
FIG. 6 is a schematic view showing an example configured from the blank of FIG.
FIG. 7A is a schematic view showing a vehicle skeleton manufactured by molding a blank of the same embodiment.
FIG. 7B is a schematic view showing a vehicle skeleton manufactured by molding a blank of the same embodiment.
FIG. 7C is a perspective view of the vehicle skeleton shown in FIG. 7B.
FIG. 7D is a schematic view showing a vehicle skeleton manufactured by molding a blank of the same embodiment.
FIG. 7E is a schematic view showing a vehicle skeleton manufactured by molding a blank of the same embodiment.
FIG. 7F is a schematic view showing a vehicle skeleton manufactured by molding a blank of the same embodiment.
FIG. 7G is a schematic view showing a vehicle skeleton manufactured by molding a blank of the same embodiment.
FIG. 7H is a partial schematic view showing a vehicle skeleton manufactured by molding a blank of the same embodiment.
FIG. 8 is a diagram showing a vehicle skeleton as an example to which the member according to the same embodiment is applied.
Mode for carrying out the invention
[0013]
　Preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. In the present specification and the drawings, components having substantially the same functional configuration are designated by the same reference numerals, so that duplicate description will be omitted.
[0014]
1. 1. Outline A
　steel plate is used, for example, to form the body of a vehicle such as an automobile. The vehicle body is required to withstand buckling in order to ensure collision characteristics in the event of a collision. At the same time, the vehicle body is also required to be lighter in order to improve its performance as a vehicle. The present embodiment relates to a member used for such a vehicle body and a vehicle skeleton including the member. In addition, such a member is manufactured by molding a blank. In the present disclosure, the blank is included in the member. This is because the members and the blanks used as the materials for the members have the same characteristics. In the following, the member may be replaced with a blank for description.
[0015]
　FIG. 1 is a schematic view showing an example of members constituting a vehicle body, and shows a B-pillar 400 that connects a floor and a roof between a front seat and a rear seat on a side surface of the vehicle. Here, FIG. 1 shows a state in which the B pillar 400 is viewed from the side (outside) of the vehicle.
[0016]
　The resistance to buckling required for members constituting the vehicle body such as the B-pillar 400 differs depending on the position or region in the member. For example, in the B-pillar 400, the range shown by the region R1 in FIG. 1 corresponds to a position where there is a high possibility that a bumper or the like of another vehicle will collide when another vehicle collides from the side surface. Therefore, in the region R1, it is desirable that the plate thickness of the B pillar 400 is relatively thin so that the impact of the collision can be easily absorbed. By reducing the plate thickness of the B-pillar 400 in the region R1, the B-pillar 400 is deformed (crushed) when the bumper of another vehicle collides, and the impact can be effectively absorbed.
[0017]
　On the other hand, the range indicated by the region R2 has higher rigidity and resistance to buckling than the range indicated by the region R1. Therefore, when the bumper collides, it has a function of suppressing deformation (deflection) to the minimum and suppressing the entry of the colliding object into the vehicle. Further, the range indicated by the area R2 supports the roof of the vehicle, and has a function of suppressing the collapse of the roof and protecting the occupants when the vehicle rolls over. By suppressing the bending and crushing of the B-pillar 400 in the range indicated by the region R2, it is possible to reliably protect the occupants inside the vehicle body. Therefore, in the region R2, it is desirable to increase the plate thickness of the B pillar 400 from the viewpoint of ensuring resistance to buckling and rigidity. By increasing the thickness of the B-pillar 400 in the area R2, it is possible to prevent the B-pillar 400 from entering the inside of the vehicle body when another vehicle collides or the own vehicle rolls over. Since the pillar 400 is prevented from being crushed in the longitudinal direction, the occupant can be reliably protected.
[0018]
　As described above, the resistance to buckling required for the members constituting the vehicle body differs depending on the position and region in the member. For this reason, in the blank for molding the member, the plate thickness of the portion where high buckling resistance is required is increased, and the plate thickness of the portion where high buckling resistance is not required is decreased. A plate thickness design is required. With such a plate thickness design, it is possible to reduce the weight of the vehicle body by ensuring a sufficient plate thickness only in the necessary parts.
[0019]
　On the other hand, as mentioned above, with technologies such as TRB and TWB, it is not possible to freely design the plate thickness, and the plate thickness becomes thicker even in places where resistance to buckling is not required, resulting in further weight reduction and seating. It is difficult to secure resistance to buckling at the same time. In the present embodiment, by realizing a member that enables free plate thickness design, it is possible to provide a member and a vehicle skeleton that can meet higher demands for both resistance to buckling and weight reduction. And. Hereinafter, a detailed description will be given.
[0020]
　2. 2. Configuration of the member (blank)
　Figure 2 is a perspective view showing the configuration of a blank 100 according to this embodiment. As shown in FIG. 2, the blank 100 according to the present embodiment is composed of a first plate material 110 and a second plate material 120, and the first plate material 110 and the second plate material 120 are overlapped with each other. All the ends of the second plate member 120 are inside the first plate member 110 when viewed in the plate thickness direction. That is, the second plate material 120 is smaller than the first plate material 110, and the contour line showing the contour of the second plate material 120 is located inside the contour line showing the contour of the first plate material 110. .. Further, all the ends of the first plate member 110 may be inside the second plate member 120 when viewed in the plate thickness direction. That is, the first plate material 110 is smaller than the second plate material 120, and the contour line showing the contour of the first plate material 110 is located inside the contour line showing the contour of the second plate material 120. May be good.
[0021]
　The second plate member 120 is joined to the first plate member 110. In the present embodiment, in particular, the first plate member 110 and the second plate member 120 are joined by continuous joining. Here, continuous joining does not include point-shaped joining such as so-called spot welding. The first plate member 110 and the second plate member 120 are joined by continuous wire joining.
[0022]
　Preferably, the first plate member 110 and the second plate member 120 are joined by wire welding. However, it is not necessary that all the joint lines of the line welding are continuous, and there may be a region on the extension line of the joint line where the line welding is not performed. Further, preferably, the line welding is performed by laser welding. FIG. 2 shows a state in which the first plate member 110 and the second plate member 120 are joined by line welding by laser welding. Therefore, three joint line portions 200 are formed on the surface of the second plate member 120. Specifically, each of the three joint line portions 200 joins the first plate material 110 and the second plate material 120 at an interface. In addition, in this specification, a "joint line portion" may be simply referred to as a "joint line". The joining line 200 may be provided along the longitudinal direction of a plate material having a small contour line (second plate material 120 in FIG. 2). The joint lines 200 may not be completely continuous, and may be partially spaced by about 30 mm, preferably about 20 mm. A film such as plating or foil may be interposed between the first plate material 110 and the second plate material 120.
　In FIG. 2, three joint line portions are formed on the plate material, but when the ridge lines are formed on the overlapped members, the joint line portions may be replaced with the ridge line portions. At the ridge line portion, the first plate member 110 and the second plate member 120 may be overlapped with each other. This is because the portion where the ridge line of the plate material is formed is not easily curved, and thus is not easily deformed as if the plate material is restrained by the joint line.
[0023]
　Although FIG. 2 shows an example in which the blank 100 is composed of the first plate material 110 and the second plate material 120, the blank 100 may be composed of three or more plate materials. When the blank 100 is composed of three or more plate materials, if the first plate material 110 and the second plate material 120 are appropriately joined by line joining, other plate materials constituting the blank 100 The presence or absence of joining the first plate member 110 and / or the second plate member 120 and the mode of joining are not particularly limited. Further, the blank 100 may be composed of a plurality of plate materials selected from a plurality of plate thicknesses. In the present embodiment, a case where the plate thickness of the first plate material 110 is equal to or less than the plate thickness of the plate material of the second plate material 120 will be described as an example.
[0024]
　The first plate material 110 and the second plate material 120 may be plate materials having different tensile strengths. For example, the first plate material 110 having a larger contour line than the second plate material 120 is a plate material serving as a base of the blank 100, and the second plate material 120 functions as a reinforcing plate material. Therefore, the tensile strength of the second plate material 120 may be higher than the tensile strength of the first plate material 110.
[0025]
　Further, the first plate material 110 and the second plate material 120 may have different amounts of carbon (C amount) contained in the plate materials. The amount of carbon shall be measured at a depth of 1/4 of the thickness of each plate material from the surface of each plate material. For example, the blank 100 can be molded by being subjected to hot stamping. At that time, the tensile strength of the first plate material 110 and the second plate material 120 after quenching can change depending on the amount of C contained in the plate material. For example, when the amount of C contained in the second plate material 120 is larger than the amount of C contained in the first plate material 110, the tensile strength of the portion of the second plate material 120 after hot stamping is the first. It becomes higher than the tensile strength of the portion of the plate material 110. The tensile strength of the first plate material 110 and the second plate material 120 is preferably 590 MPa or more.
[0026]
　Further, the surfaces of the first plate material 110 and the second plate material 120 may be plated with aluminum or the like. However, the surface of the joint surface where the first plate member 110 and the second plate member 120 are in close contact with each other does not have to be plated.
[0027]
　According to the blank 100 of the present embodiment configured as described above, by joining the second plate material 120 only to the necessary parts on the first plate material 110, resistance to buckling (that is, collision safety) It is possible to secure resistance to buckling by thickening only the part where resistance to buckling is required, and to reduce the plate thickness of the part where resistance to high buckling is not required. As a result, it is possible to construct a blank 100 that allows free plate thickness design and satisfies both buckling resistance and weight reduction requirements. Members such as the B-pillar 400 shown in FIG. 1 are formed by press-molding the blank 100.
[0028]
　3A and 3B are schematic views showing a line welding joint line 200 for welding the first plate member 110 and the second plate member 120. FIG. 3A shows an example in which the first plate member 110 and the second plate member 120 are joined by three joining lines 200 as in FIG. 2. Further, FIG. 3B shows an example in which the first plate member 110 and the second plate member 120 are joined by five joining lines 200.
[0029]
　When a load is applied to the blank 100 from the direction of the arrow A2 shown in FIGS. 3A and 3B, an initial reaction force is generated. At that time, the plate material may warp. If the plate material is warped, it means that the entire cross section of the plate material is not loaded. In order to increase the initial reaction force, it is desirable to suppress the occurrence of warpage and to make the region for receiving the load larger in the cross section in the plate width direction. The present inventor has found that by arranging at least three joint line portions (including the ridge line portion) at predetermined positions, the warp of the region surrounded by the joint line portions can be suppressed. The details will be described below.
[0030]
　As shown in FIG. 3A, the first plate member 110 and the second plate member 120 are overlapped with each other, and the first joint line portion 200a, the second joint line portion 200b, and the third joint line portion 200c are each first. The plate material 110 and the second plate material 120 are joined at an interface.
　FIG. 3C is a schematic view showing different aspects of the first joint line portion 200a, the second joint line portion 200b, and the third joint line portion 200c. As shown in FIG. 3C, the first joint line portion 200a has the shortest in-plane distance from the second joint line portion 200b 20 times or more and 120 times or less the plate thickness of the first plate material 110. It has. The second joint line portion 200b includes a B portion 310 whose shortest in-plane distance from the first joint line portion 200a is 20 times or more and 120 times or less the plate thickness of the first plate member 110. As shown in FIG. 3A, of the three junction line portions 200, the central third junction line portion 200c is in the first region 500 sandwiched between the A portion 300 and the B portion 310. The "shortest in-plane distance" is the shortest distance along the path of the first plate member 110 and the second plate member 120 along the plate material. In the example shown in FIG. 3A, it is the distance between the first joint line portion 200a and the second joint line portion 200b when the plate material is viewed in a plan view.
　The length component of the length component of the third joint line portion 200c in the first region 500 in the extending direction α of the intermediate line between the first joint line portion 200a and the second joint line portion 200b is 250 mm. That is all. The “direction in which the intermediate line between the first joint line portion 200a and the second joint line portion 200b extends” is the direction indicated by the reference numeral α in FIG. 3C.
　With such a configuration of the three joint wire portions 200, the initial reaction force can be increased and the warp of the plate material can be suppressed.
　The first joint line portion 200a, the second joint line portion 200b, and the third joint line portion 200c may be a straight line or a curved line. When at least one of the first joint line portion 200a and the second joint line portion 200b is a curved line, the intermediate line between the first joint line portion 200a and the second joint line portion 200b is also a curved line. If the middle line is a curve, the extending direction of the middle line cannot be uniquely defined. Therefore, in the present disclosure, when the intermediate line is a curved line, the direction of the straight line connecting the end of the first region 500 and the intersection of the intermediate line is regarded as the extending direction of the intermediate line.
　Each junction line portion 200 may be connected to another junction line portion 200 to form one junction line.
[0031]
　As shown in FIG. 3A, the third junction line portion 200c is preferably in the second region 510. The second region 510 is included in the first region 500, and is first from the midpoint between the first junction line portion 200a and the second junction line portion 200b on a straight line orthogonal to the intermediate line. It is a region within 20% of the distance between the joint line portion 200a and the second joint line portion 200b.
　The continuous length of the length component in the extending direction of the intermediate line between the first joint line portion 200a and the second joint line portion 200b of the third joint line portion 200c in the second region 510 is It is preferably 250 mm or more. The “direction in which the intermediate line between the first joint line portion 200a and the second joint line portion 200b extends” is the direction indicated by the reference numeral α in FIG. 3C.
[0032]
　As shown in FIG. 3C, the third junction line portion 200c is preferably in the third region 520. The third region 520 is included in the first region 500 and is a region 40 times or less the plate thickness of the first plate member 110 from the first joint line portion 200a.
　The continuous length of the length component in the extending direction of the intermediate line between the first joint line portion 200a and the second joint line portion 200b of the third joint line portion 200c in the third region 520 is It is preferably 250 mm or more.
[0033]
　In FIGS. 2 and 3A, three joint line portions are formed on the plate material, but when the blank is formed and the member has a shape including a ridge line such as a hat type, the joint line portion is the ridge line portion. You may. That is, the joint line portion can be replaced with the ridge line portion. For example, the second joint line portion 200b shown in FIG. 3A may be replaced with a ridge line portion. Due to the configuration of the two joint line portions 200a and 200c and the joint line portion 200b which is a ridge line, the initial reaction force can be increased and the warp of the plate material can be suppressed. In this case, the third joint line portion 200c is the first region 500, and is a fourth region (shown) 40 times or less the plate thickness of the first plate member 110 from the joint line portion 200b which is the ridge line portion. It may be inside. The continuous length of the length component in the extending direction of the intermediate line between the first joint line portion 200a and the ridge line portion of the third joint line portion 200c in the fourth region is preferably 250 mm or more. .. Further, there may be a third joint line portion 200c in the third region 520.
[0034]
　As described above, in order to increase the initial reaction force, it is desirable to suppress the occurrence of warpage and to make the region for receiving the load larger in the cross section in the plate width direction. Furthermore, the inventor has found that the initial reaction force is increased by the relationship between the plate thickness and the plate width of a predetermined plate material. The details will be described below.
　In order to increase the initial reaction force, it is desirable that the width that can receive the load is larger than the total plate width W 0 of the plate material . Therefore, the total plate width W of the plate 0 defines the ratio of the width of the sheet material that can receive a load to the effective width. Specifically, the effective width is the ratio of the width of the total plate width W 0 to the width of the work for receiving the load.
[0035]
　Plate width W of the plate 0 larger is the plate width W 0 cross section is widened in the direction of, to become susceptible to warping of the plate (deflection), the effective width is reduced. Further, the thinner the plate thickness t, the larger the warp of the plate material, and the ratio of the width that receives the load to the total plate width W 0 decreases. Therefore, the larger the plate width W 0 and the thinner the plate thickness t, the smaller the effective width. That is, the effective width becomes smaller as the ratio of the plate width W 0 to the plate thickness t (W 0 / t) increases. FIG. 5 shows the ratio (W 0 / t) of the plate width W 0 to the plate thickness t of the plate material having a tensile strength of 1470 MPa and the effectiveness of the plate material when restrained so as to suppress the deformation of both ends of the plate material in the out-of-plane direction. In the characteristic diagram showing the relationship with the width, W 0 / t is shown on the horizontal axis and the effective width is shown on the vertical axis.
[0036]
　As shown in FIG. 5, the effective width becomes smaller as W 0 / t increases. Therefore, in order to increase the effective width and increase the initial reaction force, it is desirable to reduce the plate width and increase the plate thickness. As shown in FIG. 5, in the region where W 0 / t is less than 20, the effective width is 1.0, so that the load can be received by the entire plate width W 0 and the initial reaction force can be increased. ..
[0037]
　In other words, in the region where W 0 / t is less than 20 , the load can be received by the entire plate width W 0 . Therefore, even if the two plate materials are not joined by wire welding, each plate material can receive a load over the entire plate width W 0 , so that the initial reaction equivalent to that of one plate material having the same total plate thickness. You can gain power.
[0038]
　The present inventor pays attention to this point, and for a plate material having W 0 / t whose effective width is smaller than 1.0 in FIG. 5 , that is, a plate material having W 0 / t of 20 or more, a plurality of plate materials. It was conceived that, for example, by joining by welding, it is possible to secure the same tensile strength as a plate material having the same total plate thickness.
[0039]
　That is, the blank 100 according to the present embodiment has a first plate material 110 and a second plate material 120, and these plate materials are joined by at least three joining lines. Here, of the three joint lines 200a, 200b, and 200c, the distance between the two outer joint lines (distance between the first joint line portion 200a and the second joint line portion 200b) is defined as W. In this case, following the relationship between the plate width W 0 and the plate thickness t described above , two joint lines (first joint line portion 200a and second joint) are formed on the outside so that the W / t value is 20 or more. A wire portion 200b) is provided, and at least one joining wire is provided between them. As a result, a blank 100 having a plurality of regions where the effective width is increased can be obtained. This improves resistance to buckling. Since the ridge line is also suppressed from being deformed in the out-of-plane direction like the joint line, the same effect can be obtained even if the joint line is replaced with the ridge line.
[0040]
　When W / t is less than 20, the original effective width is 1.0, and the two plate materials are joined in order to work to receive the load on the entire cross section along the direction of the plate width W 0. Even without it, an initial reaction force equivalent to that of a single plate having the same total plate thickness can be obtained. Therefore, when the value of W / t is 20 or less, it can be excluded from the target of the method of joining a plurality of plate materials according to the present embodiment.
[0041]
　On the other hand, if the value of W / t is too large, the distance between the joint lines is too large, and the effect of providing the joint lines may not be obtained. With reference to FIG. 5, it can be estimated that a large effect cannot be obtained when the interval between the joining lines is larger than 60 times the plate thickness. Therefore, the value of W / t is set to 120 or less. Then, when a third joint line portion is added between the first joint line portion and the second joint line portion, the distance between the third joint line portion and the first or second joint line portion becomes large. The thickness is less than 60 times the plate thickness, and the effect of providing the third joint line portion can be obtained. As a result of the study by the present inventor, the upper limit of W / t is preferably 120. Therefore, it is preferable that the value of W / t satisfies the following equation (1).
20 ≦ W / t ≦ 120 ・ ・ ・ (1)
[0042]
　Further, of the arbitrary three joint lines, the length component in the extending direction of the intermediate line of the middle line of the two outer joint lines of the joint line portion 200 provided between the two outer joint line portions. The length is 250 mm or more. When the length of the length component in the extending direction of the intermediate line of the joint line portion 200 is less than 250 mm, the plate members are overlapped when bending deformation occurs in the overlapped portion of the formed member. The effect of integrating the plate materials is not sufficient, and bending and bending may occur from unexpected places. The upper limit of the length of the length component in the extending direction of the intermediate line of the joint line portion 200 is not particularly limited, and can be set according to the shape of the plate material to be used, the place to be welded, and the like. The "direction in which the intermediate line of the two outer joint lines is extended" is the direction indicated by the reference numeral α in FIG. 3C, as described with reference to FIG. 3C.
[0043]
　Further, if the distance between any two adjacent joining lines 200 of the joining lines 200 provided on the blank 100 is W', W'/ t may be 40 or less. As shown in FIG. 5, when W 0 / t is 40 or less, the effective width is about 0.5 or more. Therefore, if the region is divided by the welding line, the effective width is improved. As a result, the warp of the plate material is suppressed, and the initial reaction force can be sufficiently increased. Therefore, if W'/ t is 40 or less after the region is divided, the warp of the region surrounded by the two adjacent joint lines is suppressed, and the effect of integration can be further obtained. Preferably, W'/ t is less than 20. As a result, the effective width when the region surrounded by the two adjacent joint lines is regarded as one plate material is 1.0, so that the warp of the region surrounded by the joint lines can be further suppressed. As a result, the effect of integration can be further obtained.
[0044]
　The configuration of the blank (member) 100 according to the present embodiment has been described above. For example, when the B pillar 400 as shown in FIG. 1 is composed of the blank 100 of the present embodiment, the region R2 in which it is necessary to suppress the bending at the time of collision is the first plate member 110 which is the base material. A second plate material 120 having a thick plate thickness may be joined to ensure high rigidity. At that time, by applying the portion of the blank 100 according to the present embodiment to which the second plate member 120 is provided, the characteristics equivalent to those obtained from a single blank (for example, bending) are applied to the region R2. The characteristic) can be exhibited in the region R2. This makes it possible to freely design the thickness of the B-pillar 400, ensure resistance to buckling (that is, improve collision safety), and reduce weight.
[0045]
　3. 3. Vehicle skeleton composed of members
　Next, a vehicle skeleton for a vehicle, which is a hat-shaped member according to an embodiment, will be described. FIG. 6 is a schematic view showing an example of a vehicle skeleton manufactured by press-molding the blank (member) 100 of FIG. 2 into the B pillar 400 shown in FIG. Similar to FIG. 1, FIG. 6 shows a state in which the B pillar 400 is viewed from the side (outside) of the vehicle. Similar to FIG. 1, the region R1 and the region R2 are shown in FIG. In the example shown in FIG. 6, the B-pillar 400 is composed of the blank 100 according to the present embodiment, and the second member 122 is joined to the first member 112 which is the base material in the region R2. The first member 112 corresponds after the processing of the first plate material 110 constituting the blank 100, and the second member 122 corresponds after the processing of the second plate material 120 constituting the blank 100. In this case, as shown in FIG. 6, the entire surface of the second member 122 facing the first member 112 may face the first member 112.
[0046]
　7A to 7H are schematic views showing a vehicle skeleton composed of the blank (member) 100 of the same embodiment. The members shown in FIGS. 7A to 7E may be replaced with hat-shaped members as shown in FIGS. 7F to 7H. The vehicle skeleton 600 is a member extending in a predetermined direction, and FIGS. 7A to 7B and 7D to 7H show a cross-sectional shape in a direction orthogonal to the extending direction. As shown in FIGS. 7A to 7H, the vehicle skeleton 600 has a ridge line portion 610, a top wall portion 620, and a vertical wall portion 630 formed by bending the blank 100.
[0047]
　The vehicle skeleton 600 is composed of a first member 112 and a second member 122, and the first member 112 and the second member 122 are overlapped with each other. The first member 112 has a top wall portion 114 extending in the longitudinal direction of the hat-shaped member. The second member 122 has a top wall portion 124 extending in the longitudinal direction of the hat-shaped member. The plate thickness of the first member 112 is equal to or less than the plate thickness of the plate material of the second member 122.
　In the vehicle skeleton 600 shown in FIG. 7A, in the top wall portion 620 (top wall portion 114 of the first member 112, top wall portion 124 of the second member), three joint line portions 200 (first joint line). The first member 112 and the second member 122 are welded at the portion 200a, the second joint line portion 200b, and the fourth joint line portion 200d). In this specification, the "joint line portion" may be simply referred to as a "joint line". The joining lines 200a, 200b, and 200d are formed along the extending direction of the vehicle skeleton 600. The first joint line portion 200a and the second joint line portion 200b are two ridge line portions 610 of the first member 112 and the second member 122 (first ridge line portion 610a, second ridge line portion 610b). It is provided in. Of the two ridge line portions 610a and 610b, the first ridge line portion 610a is the first member 112 and one end of the top wall portion 114 of the first member 112 and the top wall portion 124 of the second member 122. It is a ridge line portion 610a on which the second member 122 is overlapped. The second ridge line portion 610b is a ridge line on which the first member 112 and the second member 122 are overlapped at the other end of the top wall portion 114 of the first member 112 and the top wall portion 124 of the second member 122. Part 610b.
　The three joint line portions 200 (first joint line portion 200a, second joint line portion 200b, fourth joint line portion 200d) join the first member 112 and the second member 122 at an interface. doing.
　As shown in FIG. 7C, the first ridge line portion 610a includes a C portion 320 whose shortest in-plane distance from the second ridge line portion 610b is 20 times or more and 120 times or less the plate thickness of the first member 112. There is. The second ridge line portion 610b includes a D portion 330 whose shortest in-plane distance from the first ridge line portion 610a is 20 times or more and 120 times or less the plate thickness of the first member 112. The fourth junction line portion 200d is in the fifth region 530 sandwiched between the C portion 320 and the D portion 330. The "shortest in-plane distance" is the shortest distance along the path of the first member 112 and the second member 122. In FIG. 7C, the "shortest in-plane distance" is the line length along the outer surface in the cross section crossing the longitudinal direction of the member.
　The continuous length of the length component in the extending direction of the intermediate line between the first ridge line portion 610a and the second ridge line portion 610b of the fourth joint line portion 200d in the fifth region 530 is 250 mm or more. Is. "The extending direction of the intermediate line between the first ridge line portion 610a and the second ridge line portion 610b" means that the first joint line portion 200a and the second joint line portion 200b in FIG. 3C are replaced with the ridge line portion 610. This is the direction indicated by the symbol α.
　In the vehicle skeleton 600 described above, the top wall portion 114 of the first member 112 and the top wall portion 124 of the second member 122 are arranged so as to be on the outside of the vehicle.
　With such a vehicle skeleton 600, the top wall portion 114 of the first member 112 and the top wall portion 124 of the second member 122 are more firmly adhered to each other, and the top wall portion 114 and the top wall portion 124 are joined. It is possible to efficiently increase the resistance to buckling of the skeleton.
[0048]
　The fourth junction line portion 200d is preferably in the sixth region (not shown). The sixth region is included in the fifth region, and on a straight line orthogonal to the above intermediate line, the first ridge line portion 610a from the intermediate point between the first ridge line portion 610a and the second ridge line portion 610b. It is a region within 20% of the distance between the ridge and the second ridge portion 610b.
[0049]
　The continuous length of the length component in the extending direction of the intermediate line between the first ridge line portion 610a and the second ridge line portion 610b of the fourth joint line portion 200d in the sixth region is 250 mm or more. It is preferable to have.
[0050]
　The fourth joint line portion 200d is a fifth region, which is in a seventh region (not shown) of 40 times or less the plate thickness of the first plate member 110 from the first ridge line portion 610a. Is preferable.
[0051]
　The continuous length of the length component in the extending direction of the intermediate line between the first ridge line portion 610a and the second ridge line portion 610b of the fourth joint line portion 200d in the fifth region is 250 mm or more. Is preferable.
[0052]
　In the vehicle skeleton 600 shown in FIG. 7A, the first member 112 and the second member 122 are welded at the three joint line portions 200a, 200b, and 200d in the top wall portion 620, but FIGS. 7B and 7C are formed. In the vehicle skeleton 600 shown in FIG. 6, the first member 112 and the second member 122 are welded to each other at the fourth joint line portion 200d in the top wall portion 620. In the vehicle skeleton 600 of FIG. 7A, the first joint line portion 200a located at the first ridge line portion 610a and the second joint line portion 200b located at the second ridge line portion 610b of the vehicle skeleton 600 are omitted. Is also possible. Since the first member 112 and the second member 122 are engaged with each other at the first ridge line portion 610a and the second ridge line portion 610b, the ridge line portions 610a and 610b are joined to the first joint line portion 200a and the second joint. It exhibits the same effect as the line portion 200b. That is, it is possible to replace the joint line portion with the ridge line portion. Therefore, as shown in FIGS. 7B and 7C, for example, the ridge line portions 610a and 610b are not provided with the joint line portions, and only one fourth joint line portion 200d is used as the first member 112 and the second member. 122 may be joined. Further, by not providing the joint line portions 200a and 200b on the ridge line portions 610a and 610b, it is possible to reduce the possibility that the ridge line portions 610a and 610b are cracked when the vehicle skeleton 600 is deformed. Further, the number of joint line portions to be installed can be reduced, the cost can be reduced, or the joints of the top wall portions 114 and 124 can be strengthened.
[0053]
　As shown in FIG. 7D, the ridge line portions 610a and 610b are not provided with the joint line portions, and the top wall portion 620 (the top wall portion 114 of the first member 112 and the top wall portion 124 of the second member) Even if the first member 112 and the second member 122 are joined only by the three joint line portions 200 (the first joint line portion 200a, the second joint line portion 200b, and the fourth joint line portion 200d). good. In the vehicle skeleton 600 shown in FIG. 7D, the first joint line portion 200a and the second joint line portion 200b correspond to the ridge line portion 610 extending in the longitudinal direction. Further, as shown in FIG. 7D, the top wall portion 620 is provided with three or more joint line portions 200 (first joint line portion 200a, second joint line portion 200b, fourth joint line portion 200d). Therefore, the strain at the joint line portion 200 of the top wall portion 620 can be dispersed, and a higher load can be withstood.
[0054]
　As shown in FIG. 7E, a fourth joint line portion 200d is provided on the top wall portion 620 of the vehicle skeleton 600 (top wall portion 114 of the first member 112, top wall portion 124 of the second member), and the ceiling is provided. A joint line portion 200 (first joint line portion 200a, second joint line portion 200b) may also be provided on the vertical wall portion 630 connected from the wall portion 620 via the ridge line portion 610. Even in this case, since the ridge line portion 610 exerts the same effect as the joint line portion 200 (first joint line portion 200a, second joint line portion 200b), the ridge line portion 610 is combined with the joint line portion 200 (first joint line portion 200b). It can also be regarded as the joint line portion 200a and the second joint line portion 200b).
[0055]
　FIG. 7F shows an example in which the first member 112, which is a hat-shaped member having a flange portion, is arranged on the outside, and the U-shaped second member 122 is arranged on the inside as a reinforcing member. In the example of FIG. 7F, similarly to FIG. 7D, the first member 112 is formed by the three joint line portions 200 (the first joint line portion 200a, the second joint line portion 200b, and the fourth joint line portion 200d). And the second member 122 are welded together.
[0056]
　FIG. 7G shows an example in which the first member 112, which is a hat-shaped member having a flange portion, is arranged inside, and the U-shaped second member 122 is arranged outside as a reinforcing member. In the example of FIG. 7G, similarly to FIG. 7D, the first member 112 is formed by the three joint line portions 200 (first joint line portion 200a, second joint line portion 200b, fourth joint line portion 200d). And the second member 122 are welded together.
[0057]
　In the vehicle skeleton 600 shown in FIG. 7H, in the top wall portion 620, the first member 112 and the second member are formed by the two joint line portions 200 (fourth joint line portion 200d and fifth joint line portion 200e). 122 is welded. The two joint line portions 200 (fourth joint line portion 200d, fifth joint line portion 200e) join the first member 112 and the second member 122 at an interface.
　In FIG. 7H, the fourth joint line portion 200d has an E portion (not shown) whose shortest in-plane distance from the second ridge line portion 610b is 20 times or more and 120 times or less the plate thickness of the first member 112. I have. The second ridge line portion 610b includes an F portion (not shown) whose shortest in-plane distance from the fourth joint line portion 200d is 20 times or more and 120 times or less the plate thickness of the first member 112. The fifth junction line portion 200e is in an eighth region (not shown) sandwiched between the E portion and the F portion. The "shortest in-plane distance" is the distance between the fourth joint line portion 200d and the second ridge line portion 610b when the top wall portion 620 is viewed in a plan view in the example shown in FIG. 7H.
　The continuous length of the length component in the extending direction of the intermediate line between the second ridge line portion 610b and the fourth junction line portion 200d of the fifth junction line portion 200e in the eighth region is 250 mm or more. Is. The "extending direction of the intermediate line between the second ridge line portion 610b and the fourth joint line portion 200d" is the direction indicated by the reference numeral α when the junction line portion 200b in FIG. 3C is replaced with the ridge line portion 610b. ..
　In the vehicle skeleton 600 described above, the top wall portion 114 of the first member 112 and the top wall portion 124 of the second member 122 are arranged so as to be on the outside of the vehicle.
　With such a vehicle skeleton 600, the top wall portion 114 of the first member 112 and the top wall portion 124 of the second member 122 are more firmly adhered to each other, and the top wall portion 114 and the top wall portion 124 are joined. It is possible to efficiently increase the resistance to buckling of the skeleton.
[0058]
　The fifth junction line portion 200e is preferably in a ninth region (not shown). The ninth region is included in the eighth region, and on a straight line orthogonal to the intermediate line, the second ridge line portion 610b from the intermediate point between the second ridge line portion 610b and the fourth joint line portion 200d. It is a region within 20% of the distance between the joint line portion 200d and the fourth joint line portion 200d.
[0059]
　The continuous length of the length component in the extending direction of the intermediate line between the second ridge line portion 610b and the fourth junction line portion 200d of the fifth junction line portion 200e in the ninth region is 250 mm or more. Is preferable.
[0060]
　The fifth joint line portion 200e is an eighth region, which is in a tenth region (not shown) of 40 times or less the plate thickness of the first plate member 110 from the second ridge line portion 610b. Is preferable.
[0061]
　The relationship between the plate thickness and the plate width in the same embodiment described above will be described in detail below.
　At least three joint line portions 200 (200a, 200b, 200c) are provided along the longitudinal direction of the B pillar 400 on the top wall portion 650 of the B pillar in the region R2 of the B pillar 400 shown in FIG. .. It is represented by the distance W between the two outer joint line portions (200a, 200b) of the three joint line portions and the smaller plate thickness t of the first member 112 and the second member 122. The length of the W / t and the joint line portion 200c satisfies the provisions of the above-described embodiment. That is, at least three components satisfying 20 ≦ W / t ≦ 120 and having a length component in the extending direction of the intermediate line between the joint line portion 200a and the joint line portion 200b of the joint line portion c200 of 250 mm or more. The joint line portion of is provided on the top wall portion 650 of the B pillar 400.
[0062]
　The B-pillar 400 can be manufactured, for example, by press-molding the blank 100 according to the above-described embodiment. Specifically, the B-pillar 400 can be obtained by trimming the blank 100 according to the above embodiment into a shape for molding into the B-pillar 400, and performing general press molding on the trimmed blank 100. .. In the B-pillar 400, for example, the first plate member 110 and the second plate member 120 are separately press-molded to form the first member 112 and the second member 122, and then the first member 112 and the first member 112 It may be provided by superimposing the members 122 of 2 and then joining both members so as to provide a joining line satisfying the above-mentioned regulations by a laser or the like. However, by using the blank 100 according to the above embodiment, the B pillar 400 can be obtained only by press-molding the blank 100 once.
[0063]
　Hereinafter, the vehicle skeleton 600 composed of the blank 100 of the present embodiment will be described. Here, also in the B pillar 400 shown in FIG. 6 or the vehicle skeleton 600 described below, the resistance to buckling (that is, collision safety) can be achieved by defining the value of W / t as in the case of the blank described above. (Improvement of sex) can be improved.
[0064]
　That is, the B-pillar 400 according to the present embodiment has a first member 112 and a second member 122, and these members are joined by at least three joining lines. Here, when the distance between the two outer joint lines of the three joint lines is W, the outer joint lines are provided so that the W / t value is 20 or more, and at least one is provided between them. By providing the joint line of the above, a B-pillar 400 or a vehicle frame 600 having a plurality of regions where the effective width is increased can be obtained. This improves resistance to buckling.
[0065]
　On the other hand, if the value of W / t is too large, the distance between the joint lines is too large, and the effect of providing the joint lines may not be obtained. With reference to FIG. 5, it can be estimated that a large effect cannot be obtained when the interval between the joining lines is larger than 60 times the plate thickness. Therefore, the value of W / t is set to 120 or less. Then, when a joint line is added between the outer joint lines, the distance between the additional joint lines between the outer joint line and the outer joint line will be less than 60 times the plate thickness, and the outer joint line will be smaller than 60 times the plate thickness. The effect of providing an additional joint line between the joint lines can be obtained. Therefore, as with the blank 100, it is preferable that the upper limit of W / t is 120 in the B pillar 400 or the vehicle skeleton 600 as a result of the examination by the present inventor.
[0066]
　Further, of the arbitrary three joint lines, the length component in the extending direction of the intermediate line of the two outer joint lines of the joint line portion 200 provided between the two outer joint line portions 200. The length of is 250 mm or more. When the length of the length component in the extending direction of the intermediate line of the joint line portion 200 is less than 250 mm, the plate members are overlapped when bending deformation occurs in the overlapped portion of the formed member. The effect of integrating the plate materials is not sufficient, and bending and bending may occur from unexpected places. The upper limit of the length of the length component in the extending direction of the intermediate line of the joint line portion 200 is not particularly limited, and can be set according to the shape of the plate material to be used, the place to be welded, and the like.
[0067]
　Further, the B-pillar 400 or the vehicle skeleton 600 may be composed of a plurality of members selected from a plurality of plate thicknesses, or may be composed of a plurality of members having substantially the same plate thickness.
[0068]
　The first member 112 and the second member 122 may be members having different tensile strengths. For example, the first member 112 is the main skeleton member of the B-pillar 400 or the vehicle skeleton 600, and the second member 122 functions as a reinforcing member. Therefore, the tensile strength of the second member 122 may be higher than the tensile strength of the first member 112. The tensile strength of the first member 112 is preferably 1000 MPa or more. Further, the tensile strength of the second member 122 is preferably 1500 MPa or more.
[0069]
　Further, the first member 112 and the second member 122 may have different amounts of carbon (C amount) contained in the plate material. The amount of carbon is measured at a depth of 1/4 of the thickness of each member from the surface of each member. For example, the B-pillar 400 or the vehicle skeleton 600 is obtained by subjecting the blank 100 described above to hot stamping.
[0070]
　Further, the surfaces of the first member 112 and the second member 122 may be plated with aluminum or the like. However, the surface of the joint surface where the first member 112 and the second member 122 are in close contact with each other does not have to be plated.
[0071]
　Further, as described in the embodiment relating to the blank, if the distance between any two adjacent joint lines of the joint lines 200 is W ' , W ' / t may be 40 or less.
[0072]
　4. Example of application of the skeleton plate material according to the
　present embodiment FIG. 8 is a diagram showing an automobile skeleton 1 as an example to which the blank 100 and the vehicle skeleton 600 according to the present embodiment are applied. The vehicle skeleton 600 formed from the blank 100 may constitute the automobile skeleton 1 as a cabin skeleton or a shock absorbing skeleton. Examples of application of the vehicle skeleton 600 as a cabin skeleton are roof center lean force 201, roof side rail 203, B pillar 207, side sill 209, tunnel 211, A pillar lower 213, A pillar upper 215, kick clean force 227, and floor cross member. 229, under lean force 231 and front header 233 and the like can be mentioned.
[0073]
　Further, examples of application of the vehicle skeleton 600 as the shock absorbing skeleton include a rear side member 205, an apron upper member 217, a van parin force 219, a crash box 221 and a front side member 223.
[0074]
　When the vehicle skeleton 600 formed from the blank 100 is used as a cabin skeleton or a shock absorbing skeleton, the plate thickness for each region of the blank 100 is optimally adjusted, so that the vehicle skeleton 600 has a sufficient load capacity. .. Further, since the plate thickness for each region of the blank 100 is optimally adjusted, the impact absorption capacity and proof stress of the vehicle skeleton 600 are enhanced, which is sufficient even when a side collision or the like is input to the automobile skeleton 1. It is possible to suppress the amount of entry of the vehicle skeleton 600 into the vehicle while absorbing the impact due to the deformation. Further, when used for a floor panel of an automobile, the blank 100 can be used as it is for an automobile skeleton. Even in this case, it is possible to realize a free design such as increasing the plate thickness only in the portion of the floor panel that requires rigidity.
[0075]
　The blank 100 and the vehicle skeleton 600 have shown examples applied to the automobile skeleton 1, but the present disclosure is not limited thereto. The blank 100 and the vehicle skeleton 600 can be applied to skeletons constituting vehicles other than automobiles. Further, the blank 100 and the vehicle skeleton 600 can also be applied to a structure constituting a building or the like.
Example
[0076]
　The present inventor has diligently studied the effect of the welding mode on the blank 100 and the number of joint lines 200 on the initial reaction force with respect to the load. FIG. 4 is a diagram showing the effect of the welding mode and the number of 200 joint lines on the initial reaction force. In FIG. 4, a plate material having a plate width W 0 of 76 mm is used, and the end face of the blank 100 is formed from a direction orthogonal to the width direction (direction along the joining line 200, arrow A2 direction shown in FIGS. 3A and 3B). The vertical axis shows the initial reaction force generated when a load is applied.
[0077]
　Here, in the example shown in FIG. 4, a plate material having a tensile strength of about 1500 MPa is used, and a sample 1 made of one plate material having a plate thickness of 2.6 mm and a plate material having a plate thickness of 1.3 mm are used. Stacked samples (samples 2 to 6) were prepared. That is, in Samples 2 to 6, the total thickness of the two sheets is the same as the thickness of Sample 1. Sample 2 is obtained by stacking two plate materials and wire-welding only both ends of the plate materials. In Samples 3 to 6, two plate materials are joined by welding, but the welding method (number of joining lines, etc.) is different. In sample 3, wire welding is performed with a total of three joint wires 200 at both ends and the center of the plate material, and in sample 4, wire welding is performed with a total of four joint wires 200 at both ends and the center of the plate material, and sample 5 is performed. Then, wire welding was performed with a total of five joint wires 200 at both ends and the center of the plate material. In sample 6, both ends of the plate are line welded, and the nugget diameter is 5√t (t is the thickness (mm) of the thinner plate, that is, 1.3 mm) at a pitch of 50 mm along a total of three virtual lines in the center. Spot welding was performed. The line welding was performed by laser welding. Then, for each of Samples 1 to 6, the initial reaction force when a load was applied in the direction orthogonal to the plate width W 0 was measured. Since the outer joint line 200 is provided near both ends of the plate material, the plate width W 0 is substantially equal to the distance W between the two outer joint lines.
[0078]
　As shown in FIG. 4, in sample 1, the initial reaction force was about 140 [kN]. In sample 2, the total plate thickness was 2.6 mm, which was the same as in sample 1, but the initial reaction force did not reach 50 [kN], and the initial reaction force was less than half that of sample 1.
[0079]
　As shown in Samples 3 to 5, the initial reaction force increased as the number of joint wires 200 increased. In sample 5, the same initial reaction force as in sample 1 was obtained. On the other hand, in sample 6 where spot welding was performed, although spot welding was performed along three lines, only an initial reaction force lower than that of sample 3 was obtained, and the initial proof stress was equivalent to that of sample 2. became.
[0080]
　From the above results, it was found that when the two plate members are welded by wire welding, the initial proof stress can be improved by providing at least three joint wires 200. In particular, by providing three or more joining wires 200 in addition to the outer joining wire 200, it is possible to secure the same tensile strength as one plate material having the same plate thickness, which is the sum of the plate thicknesses of the two plate materials. Shown. It is considered that this is due not only to the effect of expanding the effective area of ​​the plate material, but also to the reduction of the breakability of the joint line due to the dispersion of strain on the joint line.
[0081]
　Although the preferred embodiments of the present disclosure have been described in detail with reference to the accompanying drawings, the present disclosure is not limited to such examples. It is clear that anyone with ordinary knowledge in the field of technology to which this disclosure belongs can come up with various modifications or modifications within the scope of the technical ideas set forth in the claims. , These are also naturally understood to belong to the technical scope of the present disclosure.
Industrial applicability
[0082]
　According to the present invention, it is possible to provide a member and a vehicle skeleton capable of satisfying both the requirements for improvement of collision safety and weight reduction by realizing free thickness difference. Therefore, the present invention has extremely high industrial applicability.
Code description
[0083]
　100 Blank (member)
　110 First plate material
　112 First member
　114 Top wall portion of first member 112 Top wall portion
　120 Second plate material
　122 Second member
　124 Top wall portion of second member 122
　Joint line
　300 A Part
　310 B Part
　320 C Part
　330 D Part
　500 First area
　510 Second area
　520 Third area
　530 Fifth area
　600 Vehicle skeleton
　610 Ridge line part
　620 Top wall part
　α Intermediate line extending direction
The scope of the claims
[Claim 1]
　A first plate material, a
　second plate material, a
　first joint line portion, a
　second joint line portion, and a
　third joint line portion
are provided, and
　the plate thickness of the first plate material is the first plate material. The thickness is less than or equal to the plate thickness of the second plate material,
　the first plate material and the second plate material are overlapped, and
　the first joint line portion, the second joint line portion, and the third joint line portion are respectively. The first plate material and the second plate material are joined at an interface,
　and the shortest in-plane distance between the first joint line portion and the second joint line portion is the plate thickness of the first plate material.
　The second joint line portion is provided with an A portion of 20 times or more and 120 times or less, and the shortest in-plane distance from the first joint line portion is 20 times or more and 120 times or less of the plate thickness of the first plate material. comprises a portion B,
　the third bonding wire portion is in the first region interposed between the a portion and the B portion,
　the third bonding wire portion in said first region, said first A
member having a length component of 250 mm or more in the extending direction of the intermediate line between the joint line portion 1 and the second joint line portion .
[Claim 2]
　The third joint line portion is the first region, and is the first from the intermediate point between the first joint line portion and the second joint line portion on a straight line orthogonal to the intermediate line. The member according to claim 1, which is in a second region within 20% of the distance between the joint line portion 1 and the second joint line portion.
[Claim 3]
　The continuous length of the length component in the extending direction of the intermediate line between the first joint line portion and the second joint line portion of the third joint line portion in the second region is 250 mm or more. The member according to claim 2.
[Claim 4]
　The third joint line portion is the first region, and is in a third region from the first joint line portion to 40 times or less the plate thickness of the first plate material. The member according to any one of 1 to 3.
[Claim 5]
　The continuous length of the length component in the extending direction of the intermediate line between the first joint line portion and the second joint line portion of the third joint line portion in the third region is 250 mm. The member according to claim 4, which is the above.
[Claim 6]
　A vehicle skeleton provided with the member according to any one of claims 1 to 5, comprising a
　first ridge line portion, a second ridge line portion, and a top wall portion, and the top
　wall portion is the first. of is between ridge portion and the second ridge portion,
　wherein the first joining line portion and the second joining line portion third joint line portion of the is in the top wall portion,
　said top wall The part is a
vehicle skeleton that is placed on the outside of the vehicle.
[Claim 7]
　A first plate material, a
　second plate material, a
　first joint line portion, a
　third joint line portion, and a
　first ridge line portion
are provided, and
　the plate thickness of the first plate material is the second plate material.
　The first plate material and the second plate material are overlapped with each other at the first ridge line portion, the first joint line portion, and the third joint line portion, which is equal to or less than the plate thickness of the plate material
　. The first joint line portion and the third joint line portion join the first plate material and the second plate material at an interface, respectively, and
　the first joint line portion is connected to the first ridge line portion. The shortest in-plane distance is 20 times or more and 120 times or less the thickness of the first plate material, and
　the first ridge line portion has the shortest in-plane distance from the first joint line portion.
　A portion B having a plate thickness of 20 times or more and 120 times or less the plate thickness of the plate material 1 is provided, and the third joint line portion is in a first region sandwiched between the A portion and the B portion, and
　the first region. A
member in which the length component of the length component in the extending direction of the intermediate line between the first joint line portion and the first ridge line portion of the third joint line portion is 250 mm or more .
[Claim 8]
　The third joint line portion is the first region, and is the first from an intermediate point between the first joint line portion and the first ridge line portion on a straight line orthogonal to the intermediate line. The member according to claim 7, which is located in a second region within 20% of the distance between the joint line portion and the first ridge line portion.
[Claim 9]
　The continuous length of the length component in the extending direction of the intermediate line between the first joint line portion and the first ridge line portion of the third joint line portion in the second region is 250 mm or more. The member according to claim 8.
[Claim 10]
　The third joint line portion is the first region, and is in a third region from the first joint line portion to 40 times or less the plate thickness of the first plate material. The member according to any one of 7 to 9.
[Claim 11]
　The continuous length of the length component in the extending direction of the intermediate line between the first joint line portion and the first ridge line portion of the third joint line portion in the third region is 250 mm or more. The member according to claim 10.
[Claim 12]
　7. The third joint line portion is the first region, and is located in a fourth region from the first ridge line portion to 40 times or less the plate thickness of the first plate material. The member according to any one of 1 to 11.
[Claim 13]
　The continuous length of the length component in the extending direction of the intermediate line between the first joint line portion and the first ridge line portion of the third joint line portion in the fourth region is 250 mm or more. The member according to claim 12.
[Claim 14]
　The member according to any one of claims 1 to 5 and 7 to 13, wherein all the ends of the first plate material are inside the second plate material.
[Claim 15]
　The member according to any one of claims 1 to 5 and 7 to 14, wherein all the ends of the second plate material are inside the first plate material.
[Claim 16]
　The member according to any one of claims 1 to 5 and 7 to 15, wherein the first joint line portion is provided along the longitudinal direction of the first plate material.
[Claim 17]
　The member according to any one of claims 1 to 5 and 7 to 15, wherein the first joint line portion is provided along the longitudinal direction of the second plate material.
[Claim 18]
　A vehicle skeleton provided with the member according to any one of claims 7 to 13
　,
　comprising a second ridge line portion and a top wall portion, and the top wall portion includes the first ridge line portion and the first ridge line portion. 　A vehicle skeleton that is located between two ridgeline portions,
　the first joint line portion and the third joint line portion are located on the top wall portion, and the
top wall portion is arranged so as to be outside the
vehicle.
[Claim 19]
　The vehicle skeleton according to claim 18, wherein the first plate material and the second plate material are overlapped on the second ridge line portion.
[Claim 20]
　A vehicle frame is a hat-shaped member,
　a first member,
　a second member,
　and the fourth joining line portion,
　a first ridge line portion,
　and a second ridge portion
provided with a
　first The plate thickness of the member is equal to or less than the plate thickness of
　the second member, and the first member and the second member are overlapped with each other at the first ridge line portion and the second ridge line portion, and the first member is overlapped with the second member
　. The member 1 has a top wall portion extending in the longitudinal direction of the hat-shaped member,
　the second member has a top wall portion extending in the longitudinal direction of the hat-shaped member, and
　the first ridgeline portion has a top wall portion extending in the longitudinal direction . A ridgeline portion where the first member and the second member are overlapped at one end of the top wall portion of the first member and the top wall portion of the second member, and
　the second ridgeline. portion is the top wall portion and said other end of said top wall portion of the second member, ridge portion where the first member and the second member are superimposed in the first member,
　the The first ridge line portion, the second ridge line portion, and the fourth joint line portion join the first member and the second member at an interface, and
　the first ridge line portion is the said. A C portion having a shortest in-plane distance from the second ridge line portion of 20 times or more and 120 times or less the plate thickness of the first member is provided.
　The second ridge line portion includes a D portion whose shortest in-plane distance from the first ridge line portion is 20 times or more and 120 times or less the plate thickness of the first member, and
　the fourth joint line portion is It is located in the fifth region sandwiched between the C portion and the D portion,
　and is intermediate between the first ridge line portion and the second ridge line portion of the fourth joint line portion in the fifth region. The continuous length of the length component in the extending direction of the line is 250 mm or more, so that
　the top wall portion of the first member and the top wall portion of the second member are on the outside of the vehicle. The
vehicle skeleton to be placed .
[Claim 21]
　The fourth joint line portion is the fifth region, and is the first from the intermediate point between the first ridge line portion and the second ridge line portion on a straight line orthogonal to the intermediate line. The vehicle skeleton according to claim 20, which is located in a sixth region within 20% of the distance between the ridgeline portion and the second ridgeline portion.
[Claim 22]
　The continuous length of the length component in the extending direction of the intermediate line between the first ridge line portion and the second ridge line portion of the fourth joint line portion in the sixth region is 250 mm or more. , The vehicle skeleton according to claim 21.
[Claim 23]
　20. The fourth joint line portion is the fifth region, and is located in a seventh region from the first ridge line portion to 40 times or less the plate thickness of the first member. 9. The vehicle skeleton according to any one of 22.
[Claim 24]
　The continuous length of the length component in the extending direction of the intermediate line between the first ridge line portion and the second ridge line portion of the fourth joint line portion in the fifth region is 250 mm or more. The vehicle skeleton according to claim 23.