The scope of the claims
[Claim 1]
It is a manufacturing method for press-molded products.
A manufacturing intermediate is formed by forming a contour forming planned portion including an undulating shape on a flat plate-shaped blank sheet as a scheduled portion of the contour forming portion that forms the contour of the outer peripheral portion of the press-molded product.
The flat shape of the blank sheet is maintained in the region from the contour formation planned portion toward the center of the manufacturing intermediate, or the manufacturing intermediate is formed in the region from the contour forming planned portion toward the center of the manufacturing intermediate. Forming an overhanging midway portion with a predetermined midway molding height,
A through hole is formed by piercing the flat portion as the portion where the flat shape is maintained or the overhanging side top portion of the overhanging portion.
The flat portion after the through hole is formed is formed into an overhanging portion having a predetermined height, or the overhanging intermediate portion after the through hole is formed is larger than the intermediate forming height. Molding into the overhanging portion of a predetermined height,
A method for manufacturing a press-molded product.
[Claim 2]
The method for manufacturing a press-molded product according to claim 1, wherein the blank sheet is a plate member having a plate thickness of 0.5 mm or less.
[Claim 3]
The contour forming planned portion includes a flat contour flat scheduled portion as a scheduled portion of the flat contour flat portion.
After forming the contour-forming planned portion from the blank sheet, the contour is formed from the press machine that forms the contour-forming planned portion by transporting the manufacturing intermediate while supporting the contour-flattening portion with a conveyor. The method for producing a press-molded product according to claim 1 or 2, wherein the production intermediate is conveyed to another press machine used in a downstream process after forming the planned formation portion.
[Claim 4]
Claims 1 to claim that the contour forming planned portion is formed from the blank sheet and then the contour forming planned portion is subjected to a finishing process including a wrist-like process to make the contour forming planned portion the contour forming portion. Item 3. The method for manufacturing a press-molded product according to any one of Items 3.
[Claim 5]
The method for manufacturing a press-molded product according to any one of claims 1 to 4, wherein the shape of the outer peripheral portion of the overhanging portion is polygonal.
[Claim 6]
The method for manufacturing a press-molded product according to claim 5, wherein the intermediate molding height is less than 1/2 the height of the overhanging portion.
[Claim 7]
The outer peripheral portion of the overhanging portion is formed into an M square (M is an integer of 3 or more).
The edge of the through hole is formed into an N-square (N is an integer of 3 or more).
M = N, and the position of the corner portion of the outer peripheral portion and the position of the corner portion of the edge portion in the circumferential direction of the through hole are shifted.
The method for manufacturing a press-molded product according to claim 5 or 6.
[Claim 8]
The press-molded product according to claim 7, wherein in the circumferential direction, the corner portion of the edge portion is arranged at a position of 1/2 of the angle pitch between two corner portions adjacent to each other on the outer peripheral portion. Manufacturing method.
[Claim 9]
The shape of the edge is a regular polygon,
Each corner of the regular polygon of the edge is formed in an arc shape.
Claimed that 0.3 ≦ a / b ≦ 1.0 when the radius of curvature of the arc shape is a and the distance from the center of the through hole to the middle point of any one side of the edge portion is b. The method for manufacturing a press-molded product according to any one of Items 5 to 8.
[Claim 10]
The method for manufacturing a press-molded product according to any one of claims 1 to 4, wherein the shape of the outer peripheral portion of the overhanging portion is circular.
[Claim 11]
The method for manufacturing a press-molded product according to claim 10, wherein the intermediate molding height is larger than 1/2 of the height of the overhanging portion and less than the height.
[Claim 12]
The method for manufacturing a press-molded product according to claim 10 or 11, wherein the edge of the through hole is circular.

Title of the invention: Method for manufacturing a press-molded product
Technical field
[0001]
The present invention relates to a method for manufacturing a press-molded product.
Background technology
[0002]
Press-molded products such as inner panels of automobile hoods are formed by press-molding blanks (see, for example, Patent Documents 1 and 2).
Prior art literature
Patent documents
[0003]
Patent Document 1: Japanese Unexamined Patent Publication No. 2001-87818
Patent Document 2: Patent No. 5920280
Outline of the invention
Problems to be solved by the invention
[0004]
The inner panel has, for example, a bottom, a vertical wall rising from the bottom, and a flange provided on the vertical wall and joined to the outer panel. When the inner panel is molded from a steel blank, a part of the blank is projected by press molding to form an overhanging portion. This overhanging portion includes a portion that becomes a vertical wall and a portion that becomes a flange.
[0005]
Press-formed products are required to be thinner by using steel plates with higher tensile strength in order to further reduce the weight. For example, while it is being considered to reduce the thickness of the inner panel of an automobile hood to less than 0.6 mm in order to achieve weight reduction, it is also required to secure bending rigidity. When the plate thickness of the inner panel is reduced in this way, it is necessary to increase the height of the vertical wall, that is, the overhang height of the overhanging portion in order to secure the rigidity. In that case, the amount of strain in the vicinity of the tip side of the overhanging portion in the overhanging direction becomes large during press molding, the ductility is insufficient, and cracks may occur during press molding. Such cracks cause molding defects.
[0006]
Further, in the press molding process, the material in the process of molding may be sequentially transferred between a plurality of pressing machines for each one or a plurality of processes to form the material into a press molded product. Therefore, when transferring a thin-walled material between press machines, care must be taken not to deform the material by receiving unnecessary external force. Here, the means for transferring the thin-walled material is limited, and for example, it is conceivable to transfer the thin-walled material while sucking the thin-walled material with a vacuum carrier. However, in reality, it is not realistic for the suction port of the vacuum carrier to suck the entire surface of the material, and the suction port transfers the material while sucking a part of the material. For this reason, a portion of the material away from the suction port may bend downward due to its own weight, resulting in unintended plastic deformation. When such deformation occurs, the dimensional accuracy of the press-molded product deteriorates. In addition, if the material bends while being sucked by the vacuum carrier, a gap is created between the material and the suction port due to the bending of the material, even if plastic deformation does not occur, and the suction force is increased. There is also the risk of a drop. The decrease in suction force causes the material to be misaligned with respect to the suction port and the material to fall. If such a misalignment occurs, the relative position between the material and the press machine will be misaligned, and in this case as well, the dimensional accuracy of the press-molded product will deteriorate. Also, if the material falls, it will lead to a decrease in productivity.
[0007]
However, in Patent Documents 1 and 2, it cannot be said that the problem of transferring the thin-walled material at the time of press molding is devised. And, such a problem exists not only in the automobile inner panel but also in other press-molded products.
[0008]
One of the objects of the present invention is to provide a method for manufacturing a press-molded product, which can suppress the occurrence of molding defects such as cracks in the material during press molding and can suppress the inconvenience when the material is transferred during press molding. To do.
Means to solve the problem
[0009]
The gist of the present invention is the following method for manufacturing a press-molded product.
[0010]
(1) A method for manufacturing press-molded products.
A manufacturing intermediate is formed by forming a contour forming planned portion including an undulating shape on a flat plate-shaped blank sheet as a scheduled portion of the contour forming portion that forms the contour of the outer peripheral portion of the press-molded product.
The flat shape of the blank sheet is maintained in the region from the contour formation planned portion toward the center of the manufacturing intermediate, or the manufacturing intermediate is formed in the region from the contour forming planned portion toward the center of the manufacturing intermediate. Forming an overhanging midway portion with a predetermined midway molding height,
A through hole is formed by piercing the flat portion as the portion where the flat shape is maintained or the overhanging side top portion of the overhanging portion.
The flat portion after the through hole is formed is formed into an overhanging portion having a predetermined height, or the overhanging intermediate portion after the through hole is formed is larger than the intermediate forming height. Molding into the overhanging portion of a predetermined height,
A method for manufacturing a press-molded product.
[0011]
(2) The method for manufacturing a press-molded product according to (1) above, wherein the blank sheet is a plate member having a plate thickness of 0.5 mm or less.
[0012]
(3) The contour formation scheduled portion includes a flat contour flat schedule portion as a scheduled portion of the flat contour flat portion.
After forming the contour-forming planned portion from the blank sheet, the contour is formed from the press machine that forms the contour-forming planned portion by transporting the manufacturing intermediate while supporting the contour-flattening portion with a conveyor. The method for producing a press-molded product according to (1) or (2) above, wherein the production intermediate is conveyed to another press machine used in a downstream process after forming a planned formation portion.
[0013]
(4) After forming the contour-forming planned portion from the blank sheet, the contour-forming planned portion is subjected to finish processing including rest-like processing to make the contour-forming planned portion the contour-forming portion. 1) The method for manufacturing a press-molded product according to any one of (3) above.
[0014]
(5) The method for manufacturing a press-molded product according to any one of (1) to (4) above, wherein the shape of the outer peripheral portion of the overhanging portion is polygonal.
[0015]
(6) The method for manufacturing a press-molded product according to (5) above, wherein the intermediate molding height is less than 1/2 of the height of the overhanging portion.
[0016]
(7) The outer peripheral portion of the overhanging portion is formed into an M square (M is an integer of 3 or more).
The edge of the through hole is formed into an N-square (N is an integer of 3 or more).
M = N, and the position of the corner portion of the outer peripheral portion and the position of the corner portion of the edge portion in the circumferential direction of the through hole are shifted.
The method for producing a press-molded product according to (5) or (6) above.
[0017]
(8) The above-mentioned (7), wherein the corner portion of the edge portion is arranged at a position of 1/2 of the angular pitch between two corner portions adjacent to each other in the peripheral portion in the circumferential direction. How to manufacture press-molded products.
[0018]
(9) The shape of the edge is a regular polygon.
Each corner of the regular polygon of the edge is formed in an arc shape.
When the radius of curvature of the arc shape is a and the distance from the center of the through hole to the middle point of any one side of the edge portion is b, 0.3 ≦ a / b ≦ 1.0. (5) The method for manufacturing a press-molded product according to any one of (8) above.
[0019]
(10) The method for manufacturing a press-molded product according to any one of (1) to (4) above, wherein the shape of the outer peripheral portion of the overhanging portion is circular.
[0020]
(11) The method for manufacturing a press-molded product according to (10), wherein the intermediate molding height is larger than 1/2 of the height of the overhanging portion and less than the height.
[0021]
(12) The method for manufacturing a press-molded product according to (10) or (11) above, wherein the edge of the through hole is circular.
Effect of the invention
[0022]
According to the present invention, it is possible to suppress the occurrence of molding defects such as cracks in the material during press molding, and it is possible to suppress the inconvenience when the material is transferred during press molding.
A brief description of the drawing
[0023]
FIG. 1 is a schematic exploded perspective view of an automobile panel according to an embodiment of the present invention.
FIG. 2 is a plan view of an inner panel of an automobile panel.
FIG. 3 is a schematic cross-sectional view taken along line III-III of FIG.
FIG. 4 is a cross-sectional view taken along the IV-IV line of FIG. 2, and the portion appearing behind the cross section is not shown.
[FIG. 5] FIG. 5 is an enlarged view of a part of FIG.
[FIG. 6] FIG. 6 is an enlarged plan view of a part of the inner panel.
FIG. 7 is an enlarged perspective view of the periphery of one overhanging portion of the inner panel.
FIG. 8 is a schematic perspective view of a main part of a vacuum carrier and a blank sheet.
9 (A) is a schematic cross-sectional view showing a blank sheet and a main part of the press machine in the step (i). FIG. 9B is a schematic cross-sectional view of a main part showing the pressing process in the step (i) by the pressing machine.
10 (A) is a perspective view of the manufacturing intermediate after the step (i). FIG. 10B is a schematic perspective view showing a state in which the vacuum carrier is attached to the manufacturing intermediate after the step (i), and a part of the vacuum carrier is not shown.
11 (A) is a schematic cross-sectional view showing the manufacturing intermediate and the main part of the press machine in the step (ii). FIG. 11B is a schematic cross-sectional view of a main part showing piercing by a press machine in the step (ii). FIG. 11C is a schematic perspective view of the manufacturing intermediate that has undergone the step (piercing) of (ii).
FIG. 12 (A) is a schematic cross-sectional view showing the manufacturing intermediate and the main part of the press machine in the step (iii). FIG. 12B is a schematic cross-sectional view of a main part showing the processing of the overhanging part by the press machine in the step (iii).
13 (A) is a schematic cross-sectional view showing the manufacturing intermediate and the main part of the press machine in the step (iv). FIG. 13 (B) is a schematic cross-sectional view of a main part showing rest-like processing by a press machine in the step (iv).
14 (A) is a schematic cross-sectional view showing the manufacturing intermediate and the main part of the press machine in the step (v). FIG. 14 (B) is a schematic cross-sectional view of a main part showing molding by a press machine in the step (v).
FIG. 15 is a diagram showing a main part of a modified example of the step (ii).
FIG. 16A is a schematic perspective view showing an overhanging portion when an overhanging portion is formed from a blank without forming a through hole. FIG. 16B is a graph showing the relationship between the position on the OO'line and the maximum principal strain for the overhanging portion shown in FIG. 16A.
FIG. 17 (A) is a schematic perspective view showing an overhanging portion when an overhanging portion is formed after forming a through hole in a blank. FIG. 17B is a graph showing the relationship between the position on the OO'line and the maximum principal strain for the overhanging portion shown in FIG. 17A.
FIG. 18 (A) is an enlarged view of a press machine. FIG. 18B is a schematic cross-sectional view for explaining the finished quality of the through hole.
FIG. 19 is a diagram showing the relationship between the height of the overhanging portion when a through hole is formed by the piercing and the limit value (allowable value) of the height that can be formed as the overhanging portion.
20A and 20B show an example of deformation of the shape of the edge portion of the through hole of the overhanging portion, and FIG. 20A is a plan view showing one overhanging portion, and FIG. 20B is shown in FIG. 20B. ) Is the ratio a / b of the radius of curvature a of each corner of the edge of the through hole and the distance b from the center of the through hole to the midpoint of one side of the edge of the through hole, and the molding limit height. It is a graph which shows the relationship.
21 is a diagram showing a modified example of the overhanging portion, FIG. 21A is a schematic plan view of the main portion, and FIG. 21B is FIG. 21A. It is sectional drawing along the XXIB-XXIB line of.
[Fig. 22] Fig. 22 shows a limit value (allowable value) of the height of the overhanging portion when a through hole is formed by the piercing and the height that can be formed as the overhanging portion in the modified example of the shape of the overhanging portion. It is a figure which shows the relationship with).
Embodiment for carrying out the invention
[0024]
In the following, first, the process leading to the idea of ​​the present invention will be described, and then the embodiment will be described in detail.
[0025]
[Background to the idea of ​​the present invention]
The present invention is an inner panel and an outer panel for automobile hoods, etc. This was conceived during the diligent research to ensure tension rigidity and dent resistance while achieving thin wall weight reduction for press-molded products such as the above.
[0026]
In the present specification, the tension rigidity is a press-molded product having a relatively gentle curved surface and a very large surface area with respect to the plate thickness, for example, the outer panel when an external force is applied to the outer panel of an automobile hood. The rigidity of the panel. Tension rigidity is an index showing the resistance to bending of the outer panel. For example, if the tension rigidity is high, the outer panel is less likely to bend when the outer panel is touched. Tension rigidity corresponds to the feeling of elastic resistance and bending deformation when the outer panel is pushed by hand. This characteristic is usually expressed by the amount of deflection when a load is applied, and the smaller the amount of deflection when a constant load is applied, the higher the tension rigidity.
[0027]
In the present specification, the dent resistance is an index of the difficulty of permanent strain remaining after being strongly pressed (an index showing the difficulty of denting and flawing). For example, when the outer panel is pressed strongly, if the dent resistance is low, a dent is easily formed. In addition, if the dent resistance is low, dents and scratches are easily formed when pebbles or the like hit the outer panel. Dent resistance refers to the difficulty of residual dents after removing a local load on the outer panel for some reason. In an actual automobile body, it occurs when the outer panel such as a door is strongly pressed with a finger or palm, or when a flying stone hits while driving. Dent is generated by plastic deformation of the part of the outer panel to which a load is applied. Therefore, when the strain of the panel reaches a certain magnitude when the outer panel is loaded, the strain remains even after unloading and dent occurs. The minimum value of the load that causes a certain residual strain on the outer panel is called the dent load, and the larger the dent load, the better the dent resistance.
[0028]
In an automobile panel, the thinner the panel thickness, the lower both the tension rigidity and the dent resistance. And, it cannot be said that the improvement of the automobile panel has been made mainly from the viewpoint of ensuring the tension rigidity while achieving the weight reduction. Furthermore, it cannot be said that improvements have been made mainly from the viewpoint of ensuring both tension rigidity and dent resistance.
[0029]
From the above viewpoint, the inventor of the present application has come up with the idea of ​​providing the inner panel with a honeycomb shape whose side length is shorter than the length of one side of the inner panel. In order to form such a honeycomb shape, the following steps 1) and 2) are usually performed.
Step 1) Form the entire member shape, including the highly rigid shape, by drawing.
Step 2) Perform piercing (punching) to remove unnecessary parts as the final product in the highly rigid shape part.
In addition, during these processes, wrist-like and trimming of unnecessary parts around the parts are performed, such as processing the loosely shaped parts into the final product shape.
[0030]
However, in the above-mentioned usual method, when forming a high-rigidity shape in step 1), the material is not durable enough to be overhanging due to the deep shape, and the material is liable to break. Therefore, as a result of diligent studies, the inventors of the present application have considered changing the deformed form of the overhang of the highly rigid shape. In other words, it was examined to improve the moldability by changing to the hole expansion molding instead of the overhang molding.
[0031]
As a result of diligent examination, it was found that the formability is improved by applying piercing before or during the overhang molding of the high-rigidity shape and changing the deformation form to the hole expansion molding. As a result of further detailed investigation, when the plan view shape is non-axially symmetric, for example, a hexagonal honeycomb shape or a quadrangular shape, the piercing timing is performed at the initial stage of forming the high rigidity shape, while the plan view shape is an axially symmetric circular shape. It was found that it is better to perform piercing timing in the latter stage of molding of a highly rigid shape in order to maximize the effect of improving moldability.
[0032]
Furthermore, by examining the feasibility of a configuration in which an inner panel or the like is press-molded with a thin-walled material, it was found that there is a problem in the transportability of the material when the material is press-molded. Specifically, as described above, in the press molding process of a press-molded product, the material in the process of molding is sequentially transferred between a plurality of press machines for each one or a plurality of steps, and the material is molded into the press-molded product. I have something to do. Therefore, when transferring a thin-walled material between press machines, care must be taken not to deform the material by receiving unnecessary external force. For example, when transferring a thin-walled material while sucking it with a vacuum carrier, in reality, the suction port of the vacuum carrier cannot suck the entire surface of the material, and the suction port is the material. Transfer the material while sucking a part of it. For this reason, a portion of the material away from the suction port may bend downward due to its own weight, resulting in unintended deformation. When such deformation occurs, the dimensional accuracy of the press-molded product is lowered, and the productivity is lowered.
[0033]
Further, as described above, when forming a honeycomb-shaped portion on the inner panel, it was extremely difficult to automatically transport the blank with holes. That is, when a thin and low-rigidity blank is automatically transported, the blank is likely to come off from the transport jig during transportation. Further, even if the perforated blank cannot be removed from the vacuum machine, it is often not possible to attach the suction port of the vacuum machine to the perforated portion. As a result, the perforated portion of the honeycomb shape bends, causing breakage, which causes a problem that the material cannot be conveyed. That is, it was found that if a large number of holes were simply pierced in a blank state, automatic transfer in a mass production press machine would not be possible.
[0034]
Based on these findings, the inventors of the present application have diligently studied a method for suppressing a decrease in tension rigidity due to a thinning of the outer panel and a decrease in dent resistance, and further, during press molding. We also enthusiastically studied methods for suppressing the occurrence of inconveniences such as unintended deformation of the material when transporting the material. As a result, the method for producing the press-molded product of the present invention has been established.
[0035]
[Explanation of Embodiment]
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this embodiment, an automobile panel will be described as an example of a press-molded product. More specifically, as an example of an automobile panel, an automobile hood inner will be described as an example. The press-molded product of the present invention is not limited to the automobile hood inner, but is a panel component for an automobile outer panel including an inner panel and an outer panel, for example, a quarter panel stiffener, a door panel (door inner panel, door outer panel). ) Can be exemplified. Further, the press-molded product of the present invention can also be used as a press-molded product constituting a structure other than an automobile.
[0036]
FIG. 1 is a schematic exploded perspective view of an automobile panel 1 according to an embodiment of the present invention. FIG. 2 is a plan view of the inner panel 2 of the automobile panel 1. FIG. 3 is a schematic cross-sectional view taken along the line III-III of FIG. FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG. 2, and the portion appearing behind the cross section is not shown. In addition, in FIGS. 3 and 4, the outer panel 3 which does not appear in FIG. 2 is shown by a two-point chain line which is an imaginary line.
[0037]
FIG. 5 is an enlarged view of a part of FIG. FIG. 6 is an enlarged plan view of a part of the inner panel 2. FIG. 7 is an enlarged perspective view of the periphery of one overhanging portion 9 of the inner panel 2. Hereinafter, unless otherwise specified, FIGS. 1 to 7 will be referred to as appropriate.
[0038]
The automobile panel 1 is a front hood provided at the front of the automobile and is also called a bonnet. The automobile provided with the automobile panel 1 is, for example, a passenger vehicle. Examples of the above-mentioned passenger vehicle include a sedan type passenger vehicle, a coupe type passenger vehicle, a hatchback type passenger vehicle, a minivan type passenger vehicle, an SUV (Sport Utility Vehicle) type passenger vehicle, and the like.
[0039]
In this specification, the front / rear, left / right, and up / down are referred to with reference to the time when the automobile panel 1 is attached to the automobile and the automobile panel 1 is closed. The front is the direction in which the car moves forward. The rear is the direction in which the automobile moves backward. The right is the turning direction of the moving vehicle when the vehicle makes a right turn. The left is the turning direction of the moving vehicle when the vehicle makes a left turn. Further, in the present embodiment, the vehicle width direction of the vehicle on which the automobile panel 1 is mounted is referred to as the width direction X. Further, the vehicle length direction of the vehicle on which the vehicle panel 1 is mounted is referred to as the length direction Y. Further, the vehicle height direction of the vehicle on which the automobile panel 1 is mounted is referred to as the height direction Z.
[0040]
The automobile panel 1 has an automobile inner panel 2, an automobile outer panel 3 supported by the automobile inner panel 2, and a joint portion 7 for joining the automobile outer panel 3 and the inner panel 2. In the following, the automobile inner panel 2 is simply referred to as an inner panel 2, and the automobile outer panel 3 is simply referred to as an outer panel 3.
[0041]
The outer panel 3 is a part of the automobile panel 1 that constitutes a part of the outer surface of the automobile. The outer panel 3 is made of a metal material such as a mild steel plate or a high tension steel plate. As the high tension steel plate, a steel plate having a tensile strength of 340 MPa or more, for example, a steel plate having a tensile strength of 590 MPa or more can be exemplified. The outer panel 3 is formed, for example, by pressing a single steel plate. The plate thickness t3 (plate thickness of the steel plate) of the outer panel 3 is set to 0.6 mm or less, preferably 0.5 mm or less, and more preferably 0.4 mm or less. There is. As described above, the thinner the plate thickness t3 of the outer panel 3, the lighter the automobile panel 1. The lower limit of the plate thickness t3 of the outer panel 3 is, for example, 0.1 mm.
[0042]
There are no particular restrictions on the shape of the outer panel 3. In the present embodiment, the outer panel 3 has a shape in which the central portion is convex upward in the height direction Z.
[0043]
The inner panel 2 is joined to the lower surface 3a of the outer panel 3 to reinforce the outer panel 3. As a result, the inner panel 2 increases the tension rigidity of the outer panel 3. Further, in the present embodiment, the inner panel 2 enhances the dent resistance of the outer panel 3. That is, in the present embodiment, the tension rigidity and the dent resistance of the outer panel 3 are not ensured by increasing the plate thickness of the outer panel 3, but are ensured by the shape of the inner panel 2. The inner panel 2 is made of a metal material such as a steel plate. The inner panel 2 is formed, for example, by pressing a single steel plate. The inner panel 2 may be an integrally molded product, or may be formed by joining a plurality of members to each other. In the present embodiment, the inner panel 2 is an integrally molded product. The plate thickness t2 (plate thickness of the steel plate) of the inner panel 2 is preferably 0.3 mm to 0.6 mm. The plate thickness t2 of the inner panel 2 may be less than the plate thickness t3 of the outer panel 3, may be the same as the plate thickness t3 of the outer panel 3, or may be larger than the plate thickness t3 of the outer panel 3. May be good.
[0044]
The inner panel 2 has an outer peripheral portion 4 provided with a contour forming portion 5 and an overhanging structure 6 arranged so as to be surrounded by the contour forming portion 5.
[0045]
The outer peripheral portion 4 is the outer peripheral portion of the inner panel 2. When the outer panel 3 closes the engine room, the outer peripheral portion 4 of the inner panel 2 is received by the vehicle body (not shown) together with the outer peripheral portion of the outer panel 3. As a result, the load acting on the upper surface 3b of the outer panel 3 is received by the vehicle body via the inner panel 2.
[0046]
The contour forming portion 5 of the outer peripheral portion 4 is a three-dimensional shape portion that forms the contour of the outer peripheral portion 4 of the inner panel 2, and is a portion of the outer peripheral portion 4 of the inner panel 2 in which bending rigidity is enhanced. In the present embodiment, the contour forming portion 5 is formed over the entire circumferential direction of the outer peripheral portion of the inner panel 2.ing. The contour forming portion 5 may be formed only on a part of the outer peripheral portion 4 of the inner panel 2 in the circumferential direction. The contour forming portion 5 includes a portion that undulates in the height direction Z when the inner panel 2 is moved in the horizontal direction. The contour forming portion 5 bends and deforms downward when the outer peripheral portion 4 of the inner panel 2 receives a load of bending downward due to lifting the flat portion of the inner panel 2 or the overhanging structure 6. It does not matter what the specific shape is, as long as it contains an undulating shape that suppresses the movement.
[0047]
In the present embodiment, the contour forming portion 5 has a contour flat portion 20, a first pedestal 21, and a second pedestal 22 formed on the first pedestal 21 and supporting the overhanging structure 6.
[0048]
The contour flat portion 20 is a portion to be adsorbed that can be adsorbed by a vacuum cup 51 described later for transportation. The contour flat portion 20 may have an area and flatness (small change in height in the height direction Z when moving in the width direction X and the length direction Y) so that the vacuum cup 51 can be attracted. .. In the present embodiment, the contour flat portions 20 are arranged at seven locations, and the contour flat portions 20 (201 to 207) are provided as the contour flat portions.
[0049]
A plurality of contour flat portions 20 are arranged on the outer peripheral side portion (outside of the first pedestal 21) of the inner panel 2, and are formed at five locations in the present embodiment. The contour flat portion 201 is formed at the front end portion of the inner panel 2 and at the center of the width direction X, and is a portion to which the bonnet striker is connected. In the present embodiment, the contour flat portions 202 and 203 are arranged near the rear end of the overhanging structure 6 in the length direction Y, and are located so as to sandwich the overhanging structure 6 in the width direction X. .. In the present embodiment, the contour flat portions 204 and 205 are arranged at the rear end portions of the inner panel 2 in the length direction Y, and are located near both ends of the inner panel 2 in the width direction X.
[0050]
A plurality of contour flat portions 20 are also arranged near the inner peripheral portion of the inner panel 2 (second pedestal 22 in the present embodiment), and are formed at two locations in the present embodiment. The contour flat portions 206 and 207 are arranged at positions advanced from the positions of the contour flat portions 201 to 205 to the center of the inner panel 2 in a plan view. The "center of the inner panel 2" means the center of the inner panel 2 when the inner panel 2 is viewed in a plan view. In the present embodiment, the contour flat portions 206 and 207 are arranged near the front end of the overhanging structure 6 in the length direction Y, and are located so as to sandwich the overhanging structure 6 in the width direction X.
[0051]
In the present embodiment, the configuration in which the contour flat portions 201 to 207 are provided will be described as an example, but this may not be the case. The number of the contour flat portions 20 may be at least 2 and may be 3. The contour flat portion 20 is arranged so that the material of the inner panel 2 can be lifted by the vacuum cup 51 with a small amount of deflection in the plan view of the inner panel 2.
[0052]
The first pedestal 21 includes a wall portion 21a rising in the height direction Z and a flat top plate 21b extending from the upper end of the wall portion toward the center of the inner panel 2. The first pedestal 21 is formed in an endless annular shape in a plan view. The outer peripheral edge portion 21c of the first pedestal 21 is shown by a thick line in FIG. The second pedestal 22 is supported on the inner peripheral edge of the top plate 21b of the first pedestal 21.
[0053]
The second pedestal 22 includes a wall portion 22a rising from the top plate 21b in the height direction Z, and a flat top plate 22b extending from the upper end of the wall portion 22a toward the center of the inner panel 2. The second pedestal 22 is formed in an endless annular shape in a plan view. Flat contour portions 206 and 207 are formed on the top plate 22b of the second pedestal 22. The inner peripheral edge portion 22c of the top plate 22b of the second pedestal 22 is shown by a thick line in FIG. The overhanging structure 6 is supported on the top plate 22b.
[0054]
The overhanging structure 6 has a three-dimensional structure provided for receiving a load acting on the upper surface 3b of the outer panel 3. The overhanging structure 6 has a structure in which members having a cross-sectional hat shape (V-shaped cross section or U-shaped cross section) are combined.
[0055]
The overhanging structure 6 has a plurality of incomplete overhanging portions 8 and a plurality of reinforcing overhanging portions adjacent to the top plate 22b (inner peripheral edge portion 4b of the outer peripheral portion 4) of the second pedestal 22 and continuous with the top plate 22b. It has 23 (231 to 234) and a plurality of overhanging portions 9.
[0056]
The incomplete overhanging portion 8 has a configuration corresponding to a configuration in which a part of the overhanging portion 9 is cut off along the circumferential direction of the overhanging portion 9 of a polygon (hexagon in the present embodiment). .. The incomplete overhanging portion 8 has a side portion similar to that of the partial unit 10 described later in the overhanging portion 9. And this side portion is continuous with the top plate 22b.
[0057]
In the present embodiment, the reinforcing overhanging portions 23 are arranged at four locations near the front portion of the overhanging structure 6 so as to reinforce the inner peripheral region of the top plate 22b of the second pedestal 22 in a plan view. It is formed. The reinforcing overhangs 231,232 are arranged symmetrically in the width direction X at the front end of the top plate 22b. The reinforcing overhanging portions 233 and 234 are arranged symmetrically in the width direction X at positions advanced rearward in the length direction Y from the reinforcing overhanging portions 231 and 232. Each reinforcing overhanging portion 231 to 234 has a vertical wall rising upward from the top plate 22b, and a flange formed at the upper end of the vertical wall.
[0058]
Each overhanging portion 9 is formed in a polygonal (hexagonal in this embodiment) annular shape in a plan view in the height direction Z. Hereinafter, when simply expressed as a plan view, it means a plan view in the height direction Z. Since each overhanging portion 9 is formed in an annular polygonal shape, the inner panel 2 can be made lightweight and the inner panel 2 can be made to have high rigidity.
[0059]
In the present embodiment, each overhanging portion 9 is formed into a regular hexagon with substantially rounded corners. A regular hexagon is a hexagon in which the lengths of each side are all the same and the internal angle is 120 degrees. Further, the term "substantially regular hexagon" refers to a hexagon that can be treated as a regular hexagon in the present specification from the viewpoint of tension rigidity and dent resistance of the outer panel 3. The shape of each overhanging portion 9 is substantially the same. In this case, "substantially the same" means that the configuration is the same except that the shape of each overhanging portion 9 is matched to the shape matching the curved shape of the outer panel 3. ..
[0060]
Each overhanging portion 9 may be formed into a hexagon other than a regular hexagon. As a hexagon other than a regular hexagon, a hexagon having a non-uniform length on each side and a hexagon having an internal angle of 120 degrees can be exemplified. As a hexagon with non-uniform length of each side, the length of the front end side and the length of the rear end side are set to a predetermined first length, and a predetermined second length different from the first length. An example is a hexagon having four sides set in.
[0061]
The overhanging structure 6 has a structure in which a plurality of hexagonal annular overhanging portions 9 are closely arranged. In this case, "closest" means that a plurality of overhanging portions 9 adjacent to each other are arranged without a gap. Specifically, the overhanging portion 9 is partitioned from the other overhanging portion 9 at the overhanging portion boundary 14 described later. As shown in FIG. 6, the overhanging portion boundary 14 is formed by the tip 13c (lower end) of the bottom 13 forming the boundary of the bottom 13 including the tip 13c. The overhanging portion boundary 14 is formed in a hexagonal shape in a plan view. With such a dense hexagonal arrangement, the overhanging structure 6 can withstand loads in all directions, including the height direction Z, in all regions in plan view in much the same way.
[0062]
When the flanges 11 described later of the overhanging portion 9 are arranged most closely, it is preferable that the plurality of overhanging portions 9 have the same shape. Further, the overhanging portions 9 having different shapes and similar shapes may be arranged most closely. In the overhanging structure 6, the overhanging portions 9 may not be arranged most closely, and other portions may be formed between the overhanging portions 9 and 9 adjacent to each other.
[0063]
In the present embodiment, the plurality of overhanging portions 9 are formed symmetrically in the width direction X as a whole. For example, in the present embodiment, three overhanging portions 9 are lined up in the front-rear direction at the center of the width direction X. Then, in a plan view, the plurality of overhanging portions 9 are arranged symmetrically in the width direction X with reference to the virtual line A1 extending in the front-rear direction through the center of the width direction X in the three overhanging portions 9. Not limited to this configuration, tension rigidity, dent resistance, and mass do not depend on the direction of the overhanging portion 9, so that there is no restriction on the direction of the overhanging portion 9.
[0064]
In the present embodiment, four overhanging portions 9 arranged in the length direction Y are arranged in order from the three overhanging portions 9 arranged at the center position in the width direction X toward the right side, and further, the length is further increased. Three overhangs 9 arranged in the direction Y are arranged, two overhangs 9 arranged in the length direction Y are arranged, and two overhangs 9 arranged in the length direction Y are further arranged. There is. Further, in the same manner as described above, the four overhanging portions 9 arranged in the length direction Y are arranged in order from the three overhanging portions 9 arranged at the center position in the width direction X toward the left side, and further. , Three overhanging portions 9 arranged in the length direction Y are arranged, two overhanging portions 9 arranged in the length direction Y are arranged, and two overhanging portions 9 arranged in the length direction Y are further arranged. Have been placed.
[0065]
Each overhanging portion 9 has six partial units 10 (10a to 10f). In the present embodiment, in each overhanging portion 9, the front partial unit 10a and the rear partial unit 10d extend along the width direction X, respectively. Then, in each overhanging portion 9, the remaining four partial units 10 extend in a direction inclined with respect to the length direction Y in a plan view. In this way, the polygonal overhanging portion 9 is formed by the plurality of partial units 10.
[0066]
As is well shown in FIGS. 5 to 7, each partial unit 10 (10a to 10f) is separated from the flange 11, the vertical wall 12 continuous with the flange 11, and the vertical wall 12 continuous with the flange 11. It has a bottom portion 13 which is formed.
[0067]
The flange 11 is adjacent to the outer panel 3 and is the portion of the partial unit 10 that is closest to the outer panel 3. The flange 11 is a strip-shaped portion. In one overhanging portion 9, the flanges 11 of the six partial units 10a to 10f form a hexagonal flange as a whole. The inner end 11a of the six flanges 11 constitutes an annular end as a whole. That is, the through hole 18 is formed by the inner end portions 11a of the six flanges 11. The width of the upper surface 11b of the flange 11 (the width in the cross section orthogonal to the longitudinal direction L of the partial unit 10) is the distance between the inner end 11a and the outer end 11c of the flange 11. In a cross section orthogonal to the longitudinal direction L of the partial unit 10 (cross section shown in FIG. 5), the outer end portion 11c is a virtual line V1 including the upper surface 11b (straight portion) of the flange 11 and the upper side surface 12a of the vertical wall 12. It is an intersection of virtual lines V2 including an intermediate portion (straight portion). When the flange 11 and the vertical wall 12 are connected in a curved shape as in the present embodiment, the outer end portion 11c becomes a virtual end portion. On the other hand, when the flange 11 and the vertical wall 12 are connected in a linearly pointed shape, the outer end portion 11c serves as a connection point between them. Of the flanges 11, the width of the upper surface 11b to which the joint portion 7 can be applied is preferably 2 mm or more in that a sufficient amount of the joint portion 7 is provided.
[0068]
In the cross section orthogonal to the longitudinal direction L of the partial unit 10, the inner end portion 13a of the bottom portion 13 is an intersection of the virtual line V3, which is a tangent line of the top of the lower side surface 13b of the bottom portion 13, and the virtual line V2 described above. When the vertical wall 12 and the bottom portion 13 are connected in a curved shape as in the present embodiment, the inner end portion 13a of the bottom portion 13 becomes a virtual portion. On the other hand, when the vertical wall 12 and the bottom portion 13 are connected in a linearly pointed shape, the inner end portion 13a of the bottom portion 13 becomes an existing portion.
[0069]
Both ends of the flange 11 in the longitudinal direction L are each formed in a curved shape in a plan view, and slide with the flange 11 of the adjacent partial unit 10.It is continuous. In the present embodiment, in each overhanging portion 9, at least a part of the flange 11 of the partial unit 10 is adhered to the joint portion 7 on the upper surface 11b, and is adhered to the outer panel 3 via the joint portion 7. There is. As shown in FIG. 5, the vertical wall 12 extends downward from the flange 11.
[0070]
The vertical wall 12 is arranged between the flange 11 and the bottom 13, and connects the flange 11 and the bottom 13. The vertical wall 12 is provided over the entire area in the longitudinal direction L of the partial unit 10 in which the vertical wall 12 is provided. For example, the vertical wall 12 is formed in a tapered shape that advances toward the central axis side (inner end portion 11a side) of the overhanging portion 9 as it approaches the outer panel 3 side.