Technical field
[0001]
　The present invention relates to a press-molded parts and a manufacturing method thereof for an automobile body can increase the strength and rigidity of the automobile body efficiently. Specifically, the present invention, the top plate, the vertical wall, the flange, and the top plate - vertical wall, the vertical wall - automotive body press-formed having a hat-shaped cross-sectional shape with a ridgeline formed between the flange parts, and a method for producing the same. The automobile body for press molding component has an outward flange formed by bent outwardly relative to the part cross-section from the vertical wall to at least one end of the extending direction of the ridge. Further, the automobile body for press molding parts, an outward flange leading to a vertical wall (hereinafter, referred to as "vertical wall flange") and the flange (hereinafter referred to as "floor flange") are continuously formed, and the vertical wall of the outward flange and the curvature radius of the corner portion adjacent the floor flange (hereinafter, referred to as vertical wall angle R) is small metal plate of the press molded part. The metal plate, steel plate resistance and aluminum sheeting can be exemplified.
BACKGROUND
[0002]
　Automobile body, typically, in a number of molded panels together with a box body and joined by resistance spot welding Align overlapping each other edge portions, resistance spot welding a reinforcing member and strength members to key points of the box body constructed by joining. The thus be members referred to as automobile body structural member. Such automobile body structural member, the floor cross member, the rocker (sill), there is a belt line or the like. In the following description, taken as an example of the floor cross member as automobile body structural member.
[0003]
　Floor cross member, for example, is press-formed, a top plate, two ridge lines leading to the top plate (hereinafter, referred to as "upper edge line") and two longitudinal walls connected to each ridge on two, two vertical walls two ridge leading to each (hereinafter, referred to as "lower ridge") has a, two cross-sectional shape of the formed substantially hat shape by two floor flanges connected below each ridge. The end portion of the extending direction of the upper ridge and lower edge line of steel plate body having the cross-sectional shape to form an outward flange bent outwardly against the part cross-section, the outward flange and the side sill inner after superposition, assembled by resistance spot welding or arc welding or the like. Also, the floor cross member, and the vehicle body rigidity, an important automobile body structural member that contributes to crushing suppression of the passenger compartment in the event of a side collision. Therefore, until also this member shape and, invention and to increase the rigidity of vehicle body by reviewing the structure of the coupling portion between the members, the invention discloses a number of manufacturing methods member.
[0004]
　Patent Document 1, provided at a longitudinal end of the hat-shaped cross-section of the press-molded product, the top plate, by forming continuously the outward flange adjacent the vertical wall, and the upper ridge, member invention is disclosed to improve the performance. Patent Document 2, an opening is provided on the side surface of the side sill inner, increasing the binding strength between the side sill and the floor cross member by welding the sill inner reinforcement and the floor cross member which is disposed inside the side sill invention It has been disclosed. Further, Patent Document 3, as well as opening the side sill inner without enlarging the cross section, and the invention to increase the bond strength between the side sill and the floor cross member by providing a plurality of the welds between the floor cross member is disclosed there.
CITATION
Patent Document
[0005]
Patent Document 1: JP 2015-74354 JP
Patent Document 2: Japanese Patent 2996031 Patent Publication
Patent Document 3: JP-A 2-141372 Patent Publication
Patent Document 4: Japanese Patent No. 5569661
Patent Document 5: Japanese Patent No. 2560416
Patent Document 6: Patent No. 2554768 specification
Patent Document 7: JP-a 7-112219 Pat
Patent Document 8: JP-a 4-118118 JP
Summary of the Invention
Problems that the Invention is to Solve
[0006]
　~ Patent Document 1 3 are those invented in order to improve the side impact safety. However, the invention is not focused on the magnitude of the vertical wall angle R in any of the patent document. For example, Patent Document 1, a large vertical wall angle R, the vertical wall flange - between the floor flange member which is formed continuously gradually is illustrated. On the other hand, in Patent Document 2, unlike that shown in Patent Document 1, a vertical wall angle R is relatively small. In Patent Document 3, vertical wall angle R how near is unclear. In any of Patent Document, none have described in detail the dimensions of the vertical wall angle R. From the above, not been little attention on the effect of the vertical wall angle R on member performance, detailed studies have not been made.
Means for Solving the Problems
[0007]
　The present inventors, in view of such problems of the prior art have the result of intensive studies to solve the above problems, and obtained a finding A ~ D of listed below, and have completed the present invention.
(A) By reducing the vertical wall angle magnitude of R (curvature radius), cross line length at the member end is increased. Therefore, members performance (load resistance) is improved in the axial collapse deformation mode as input to the floor cross member during a side collision.
Specifically in (B) (A), the dimensions of the vertical wall angle R, may be 13% or less of the cross line length at the member ends.
(C) with the reduction of the vertical wall angle R, the area of the vertical wall flanges and the floor flange is increased. Therefore, when combined with other members, it becomes possible to increase the welding length of strike number, or arc welding or laser welding spot welding, leading to improvement of body performance such as coupling efficiency and stiffness between the members.
The reduction of the (D) vertical wall angle R, can fill the gap generated upon binding with other members. It leads to improved body performance of the coupling efficiency and rigidity between the members.
(E) In addition to the reduction of the vertical wall angle R, provided in the longitudinal direction of the end portion of the hat-shaped cross-section of the press-molded product, the top plate, the vertical wall, and an outward flange that is adjacent to the upper edge line continuously by forming, it is possible to enhance the further member performance.
[0008]
　The present invention is as listed below.
(1) through the upper ridge line on both sides of the top plate and the top plate a member comprising a vertical wall facing the two,
of the members through the top plate ridge on the end portion side of the member of the top plate a top plate flange extending outwardly
and two vertical walls flanges through the vertical wall ridge extending on the end side of said member of said vertical wall extending outwardly of the member
adjacent said vertical wall flange of the vertical wall comprises two floor flanges extending outwardly of the member through the lower ridge extending to an end of another of said longitudinal walls and end,
respectively the floor flange adjacent consecutive said vertical wall flange and the end portion and,
at the end of the member, .SIGMA.L sum of the top plate and the vertical wall of a width in the curvature of the vertical wall corner radius sum .SIGMA.R and member end between the lower ridge and the vertical wall ridges, .SIGMA.R / member, characterized in that have a relationship of .SIGMA.L ≦ 0.13.
(2) member according to claim 1, wherein the radius of curvature of the corner of the vertical wall between the lower ridge and the vertical wall ridge is 20mm or less.
(3) member according to claim 1 or claim 2 wherein the top plate flange and the vertical wall flange is continuous.
(4) the longitudinal walls is triangular, member according to any one of claims 1 to 3, characterized in that the floor flange also serves as the vertical wall flange.
(5) according to any one of claims 1 to 4 A manufacturing method according to the press molding of the member, the floor flange in at least two positions of the blank of the vertical wall flange that is continuous with at least a portion the floor flange some of the first step and flanging shrinkage each
vertical wall which is continuous with the top plate flange to the top plate flange to at least two positions between at least two positions in the following the first step in the first step of the blank method for producing a press-molded article, characterized in that it comprises a second step of flanging stretch flange of the remainder, respectively.
[0009]
　The present invention has an object to provide a member such as a floor cross member of FIG. However, members to which the present invention is not intended to be limited to the floor cross member, the vertical wall is also not limited to a rectangle. For example, the vertical wall may be triangular press-molded product as shown in FIG.
[0010]
　However, an attempt to produce this member by press molding, the vertical wall flange - for between floor flange comprising a shrink flange portion, the meat more than wrinkling. For example, Patent Document 4, although the production method of the member disclosed in Patent Document 1 is shown, the vertical wall flange with the patent document 4 - When the shrinkage flange portion between the floor flange is press-molded, press-molded meat more than wrinkles in order to not be able to apply tension to the sometimes steel plate. Thus, may be provided a notch between the vertical wall flanges and the floor flange, by the vertical wall angle R is set to, for example 30mm and larger, had to reduce the occurrence of wrinkles. Therefore, as described above, the floor crossmember, be joined with the side sill inner via vertical wall flange, Ya notch in the vicinity of the junction between the floor cross member and the side sill, a large vertical wall angle R gap caused by exist inevitably, load bearing performance such as during axial collapse during collision is lowered. Therefore, when forming the outward flange, it is necessary to realize the molding of the flange portion shrinkage while suppressing the occurrence of wrinkles shrinkage flange portion. Up to now, the invention of wrinkles without press-molding the flange section contraction is disclosed numerous. For example, the roof Patent Document 5, disclosed invention to prevent the generation of wrinkles by applying a specific shape to the flange portion contraction of the diaphragm rectangular tube molding, the 6,7, having an opening for a sunroof the panel, is disclosed invention to impart a shape to absorb excess line length in shrink flange, furthermore, Patent Document 8, wrinkles by molding while loading the pressure pressing the flange shrinkage using a cam structure inhibiting invention of generation is disclosed.
[0011]
　However, the invention disclosed in Patent Document 5 can be carried when not affect the appearance and performance of products, for example, the particular shape at a position connected to the other part (side sill) as the floor cross member is granted am with bonding becomes difficult, and load transmission performance during collision deformation also decreases.
[0012]
　Invention disclosed in Patent Document 6 and 7, the surplus line length which is a cause of more than wrinkles and meat, and absorbs the excess thickness shape preset. Therefore, in this 予肉 portion by resistance spot welding, of course, when the excess thickness portion is in the way of other parts of the spot welding can not carried out the invention disclosed by Patent Documents 6 and 7.
[0013]
　Further, the invention disclosed in Patent Document 8, although it certainly suppressed plane deformation due to buckling, there is no change in the portion where the plate thickness shrinkage deformation is concentrated is increased. Therefore, excessive increase durability per type of strong will die in the meat point, and thus productivity is reduced.
[0014]
　Thus, in the prior art, the vertical wall flange - for it has not been possible to press molding without wrinkles during the floor flange, reduction of the load transmission characteristics such as time of axial collapse during collision was inevitable .
[0015]
　The present inventors have made intensive studies in order to solve the above problems, with the listed findings (A) ~ (C) below, and have completed the present invention.
(A) in a first step, the vertical wall flange performed flanging shrinkage at any constraint conditions blank - an intermediate molded article by molding the connecting part between the floor flange.
(B) In the second step, the vertical wall flanges - by performing press molding the intermediate molded article the connecting portion is formed between the floor flange, the press having a desired cross-sectional shape with the top plate, the vertical walls and flanges and molded parts.
(C) In the second step, by using the inner pad shaping to be described later, the top plate, the vertical wall, and an outward flange continuous shape adjacent to the upper edge line can be produced.
[0016]
　The present invention is as listed below.
(1) By flanging shrink the lower flange connecting portion by performing press forming on the blank, the first step of producing an intermediate molded article comprising at least the lower flange connecting portion, the press-molding the intermediate molded article go and method for producing a press-molded part, characterized by a second step of producing the press molded part having the cross-section.
Effect of the invention
[0017]
　The present invention is used by joining with other members, when the member is subjected to a collision load, it is possible to provide a member with a high load bearing on the joint. In addition, it provides a method for producing the member by press molding.
BRIEF DESCRIPTION OF THE DRAWINGS
[0018]
[1] Figure 1 is an explanatory view of the member end.
FIG. 2 is an illustration of another member.
FIG. 3 is an explanatory view showing a member according to the present invention.
[4] FIG. 4 is an explanatory diagram showing another member according to the present invention.
FIG. 5 is an explanatory view of a corner portion of the high strength member.
FIG. 6 is an explanatory view of a corner portion of the lower strength member.
[7] FIGS. 7 (a) and 7 (b), axial collapse by member, to load the impact load to the extending direction of the upper ridge while bonded via another member and the outward flange is a graph showing the results of analysis by curvature effects a computer simulation of the radius R (mm) of the corner portion between the lower ridge and the vertical wall ridge on axial collapse characteristic of when the.
[8] FIG. 8 is an explanatory diagram showing an analysis result.
[9] FIG. 9 is an explanatory diagram showing an analysis result.
[10] FIG 10 is an explanatory diagram showing an analysis result.
[11] FIG 11 is an explanatory diagram showing an analysis result.
[12] FIG 12 is an explanatory view of the impact test.
[13] FIG 13 is an explanatory view of the manufacturing process by press molding.
[14] FIG 14 is an explanatory view showing a manufacturing device 20.
[15] FIG 15 is an explanatory view showing the arrangement of the blanks before the start forming in the manufacturing device 20.
[16] FIG 16 is an explanatory diagram showing a status of a molding bottom dead center of the manufacturing apparatus 20.
[17] FIG 17 is an explanatory diagram showing a manufacturing apparatus 30.
[18] FIG 18 is an explanatory view showing a blank before starting preform in the manufacturing apparatus 30.
[19] FIG 19 is an explanatory view showing the blank after preforming completion by the manufacturing apparatus 30.
[20] FIG 20 is an explanatory view showing a manufacturing device 40.
[21] FIG 21 is an explanatory view showing the arrangement of the preform before the start forming in the manufacturing apparatus 40.
[22] FIG 22 is an explanatory diagram showing a status of a molding bottom dead center of the manufacturing apparatus 40.
[23] FIG 23 is an explanatory diagram showing the structure of an example of a manufacturing apparatus for manufacturing apparatus 50.
[24] FIG 24 is an explanatory view showing the disposition of an intermediate product in the production apparatus 50.
[25] FIG 25 is an explanatory diagram showing a status of a molding bottom dead center in the manufacturing device 50.
FIG. 26 is an explanatory diagram showing a configuration of another example of a manufacturing apparatus for manufacturing apparatus 60.
[27] FIG 27 is an explanatory view showing the disposition of an intermediate product in the production apparatus 60.
FIG. 28 is an explanatory view showing the condition of the hold of the edge line pads in the manufacturing apparatus 60.
[29] FIG 29 is an explanatory diagram showing a status of a molding bottom dead center in the manufacturing device 60.
DESCRIPTION OF THE INVENTION
[0019]
　Reference will now be described in detail preferred embodiments of the present invention. In the specification and the drawings, components having substantially the same function and structure are a repeated explanation thereof by referring to the figures.
[0020]
1. Member according to the present invention
(1) the shape of the member
　Figure 3 is an explanatory view showing a member 1 according to the present invention, FIG. 4 is an explanatory diagram showing another member 12 according to the present invention. 1 main line edge members in the figure, two lines are ridge, dotted line means the portion hidden behind the member.
[0021]
　Member 1 in FIG. 3, a tensile strength of at least 440 MPa, preferably more than 590 MPa, more preferably be more than 980 MPa, a member of the plate thickness is from 2.3mm following high-tensile steel plate or 0.7 mm.
[0022]
　FIG member 1 of 3, has a cross-section of the hat with a vertical wall 3,2 pieces of lower ridge lines 5 and two beds flange 9 facing over ridge 4,2 sheets of the top plate 2, 2 present.
[0023]
　Upper ridge line 4 is present between the top plate 2 and the longitudinal wall 3. Each lower ridge 5 is present between the vertical wall 3 and a floor flange 9.
[0024]
　Member 1 has an outward flange via a ridge on at least one end portion of the upper ridgeline 4. Top plate flange 11 to the outside of the member through the top plate ridge 6 extending between the ends of the upper edge line 4 extends. Further, the vertical wall flange 10 on the outside of the member through the vertical wall ridge 7 that extends to the end of the adjacent vertical wall 3 on the top plate ridge lines 6 extends. Top plate flange 11 and the vertical wall flange 10 is continuous, the outward flange and a top plate flange 11 and the vertical wall flange 10.
[0025]
　End and a floor flange 9 of the vertical wall flange 10 even through the flange ridge 8 consecutive, end portions of the flange ridge 8 ends and the lower ridge 5 of the vertical wall ridge 7 are connected at one point.
[0026]
　Incidentally, at the end of the upper edge line 4, the top plate flange 11 and the vertical wall flange 10 it may not be contiguous. However, at the end of the upper edge line 4, the top plate flange 11 and the vertical wall flange 10 is better to be continuous, the performance of the members is improved. Case of continuous top plate flange 11 and the vertical wall flange 10, since the level of difficulty in molding is increased, it is necessary to pay attention to the selection and the flange width of the material.
[0027]
　Differences member 12 and the member 1 of FIG. 3 in FIG. 4 is a vertical wall 3 is triangular member 12, at the other end of the upper ridge line 4 without vertical wall flange 10, the upper edge line 4 and the lower ridge 5 It has led and end. As a result, at the other end, it is that the ceiling plate flange 11 and the floor flange 9 are connected. In another aspect, since the vertical wall 3 becomes a triangle, at the other end, the floor flange 9 and vertical wall flange 10 is doubles. Even if the vertical wall 3 becomes triangular in this embodiment, as in the case longitudinal walls of Figure 3 is square, also allowable that no continuous with the top plate flange 11 floor flange 9 and the vertical wall flanges 10 . Moreover, the longitudinal wall 3 is triangular, the vertical wall 3, a corner portion where the upper edge line 4 and the vertical wall ridge 7 intersect, corner the vertical wall ridge 7 and the lower ridge 5 intersect the upper edge line 4 and the lower ridge lines 5 intersect corners, which means that comprises three corner portions of the. Corners or Maruka', be somewhat deviates from the triangular ridge line is made from the side of the three straight lines or have meandering allowed.
[0028]
　Figure 5 shows the case where the high strength of the part B of FIG. Figure 6 shows the case of low strength of the B portion of FIG. Ridgeline section between the two lines in the drawing is curved. Showing a small radius of curvature range of the cross section of the ridge by an arrow. Comparing Figure 5 and Figure 6, the radius of curvature R of the corner portion of the vertical wall 3 during the lower ridge 5 and the vertical wall ridge 7 end of the lower ridge 5 and the vertical wall ridge 7 sag (the cross section of the ridge bending radius of curvature becomes larger) with increase of. When the end portion of the lower ridge 5 and the vertical wall ridge 7 sag, i.e. large radius of curvature R, decreases the strength of the end portions of the vertical wall ridge 5 below ridge line 7, further vertical wall flange 10 and the floor can no longer be bonded to the other member of the flange 9 to the vicinity of the flange edge line 8, load capacity and stiffness of the member is reduced.
[0029]
　In members of the present invention, the sum ΣR curvature of the corner portion of the vertical wall 3 during the lower ridge 5 and the vertical wall ridge line 7 radius (vertical wall angle R), a top plate ridge lines 6 of the top plate 2 at the member ends the length of the sum .SIGMA.L vertical wall ridge 7 of the longitudinal wall 3 has a relation of ΣR / ΣL ≦ 0.13. Incidentally, the sum of the width of the top plate 2 and the longitudinal wall 3 of the member end is the length of the case where the corner of the vertical wall 3 or the top plate 2 of each end has a pin angle (radius of curvature is 0).
[0030]
　Assuming the application as automotive parts of members of the present invention, since the ΣL of automotive parts is generally 300 mm, the radius of curvature (vertical wall corner of the vertical wall 3 during the lower ridge 5 and the vertical wall ridge 7 corner R) is generally made in 20mm or less.
[0031]
(2) Effect of member
　Figure 7 (a) and 7 (b) is a graph showing the results of the axial collapse characteristic of the member 1 was analyzed by computer simulation. Analytics member 1 with other members (side sill inner) and an outward flange model loaded with impact load in the direction of extension of the upper edge line 4 in a state where the bonded via the (vertical wall flange 10 and the top plate flange 11) went. FIGS. 7 (a) and 7 (b), the curvature radius of the corner portion of the vertical wall 3 during the lower ridge 5 and the vertical wall ridge 7 on the axial collapse characteristic of when the axial collapse R (vertical wall angle R) It shows the effect of (mm). 7 (a) is the case the radius of curvature R of 2mm and 20 mm, showing the relationship between the crushing stroke and the load in the extending direction of the upper edge line 4. In FIG. 7 (a), the solid line shows the case the radius of curvature R of 2 mm, the broken line radius of curvature R indicates the case of 20 mm. Figure 7 (b) shows the relationship between the radius of curvature R and the maximum load (load capacity). The cross-sectional shape of the member 1, the sum ΣL of the width of the top plate 2 and the longitudinal wall 3 of the member end portion is 300 mm. The material is tensile strength 980MPa, simulating the steel sheet having a thickness of 1.2mm. In order to focus only on the influence of the radius of curvature R corners of the vertical wall 3 of the between the lower ridge 5 and the vertical wall ridge line 7 (vertical wall angle R), the corners of the other of the top plate 2 and the longitudinal wall 3 pins angle (the radius of curvature of the corner is 0) are simulated by.
[0032]
　As shown in the graph of FIG. 7 (a), the maximum should curvature radius R is small, especially the load is increased in the initial collision, and as shown in the graph of FIG. 7 (b), the smaller the radius of curvature R it can be seen that the load (load-bearing) is increased. Thus, member 1, such as during axial collapse during a collision as the radius of curvature R corners of the vertical wall 3 of the between the lower ridge 5 and the vertical wall ridge line 7 (vertical wall angle R) (mm) is small It can be improved load transfer characteristics (crashworthiness).
[0033]
　The height of the vertical wall 3 of the member 1 of FIG. 3 in FIG. 8 shows a comparison of load-bearing (maximum load) of changing the width of the top plate 2. Both ΣL sum of the width of the top plate 2 and the longitudinal wall 3 of the member end portion is 300 mm. Figure 8 is a strength 980 MPa, the analysis result of member 1 consisting of a plate thickness 1.2mm material simulating a case of inputting a impact load in the direction of extension of the upper edge line 4 pulling. .SIGMA.R / .SIGMA.L the horizontal axis of the graph in FIG. 8 has changed the curvature radius R of the corner portion of the vertical wall 3 during the vertical wall ridge 7 and the lower ridge 5 (vertical wall angle R). While the length of the sum .SIGMA.L vertical wall ridge 7 and the top plate ridge lines 6 of the constant, but changed the length of the vertical wall ridge 7 and the top plate ridge line 6, to the point of improving the load bearing in .SIGMA.R / .SIGMA.L ≦ 0.13 change was observed.
[0034]
　It shows a comparison of load-bearing in the case of changing the cross-sectional line length without changing the length ratio of the vertical wall ridge 7 and the top plate ridge lines 6 of the member 1 of FIG. 3 (maximum load) in FIG. Height and width of the top plate 2 of FIG. 9, the vertical wall 3 are equal. Conditions of analysis of FIG. 9 is identical to FIG. Changing the section line length without changing the ratio of the width of the vertical wall 3 of the top plate 2 at the member ends, but the change in the point of improving the load bearing in .SIGMA.R / .SIGMA.L ≦ 0.13 was observed.
[0035]
　Figure 10 shows the analysis result of changing the radius of curvature R (vertical wall angle R) corner portion of the vertical wall 3 of between vertical wall ridge 7 and the lower ridge 5 of the member 1 of FIG. Model analysis of Figure 10, while the sum .SIGMA.L width of the top plate 2 and the longitudinal wall 3 of the member end portion of the member 1 is 300 mm, .SIGMA.R / .SIGMA.L is 0.13, the vertical between the vertical wall ridge 7 and the lower ridge 5 changing the curvature radius R of the corner portion of the wall 3 (vertical wall angle R). That changing the radius of curvature of the vertical wall angle R sum and a constant one of the one vertical wall angle R and the other vertical wall angle R. Conditions of analysis of FIG. 10 is the same as FIG. The horizontal axis of the graph in Figure 10 shows the curvature radius of the corner portion of the vertical wall 3 during the vertical wall ridge 7 and the lower ridge 5 R (vertical wall angle R). If ΣR / ΣL is constant, a large change in the load-bearing even if the change in the radius of curvature of the corner of the vertical wall 3 was observed.
[0036]
　8, 9, from the results of FIG 10, regardless of the cross-sectional shape of the member 1, member 1 it can be seen that with a high load capacity (maximum load) in the case of ΣR / ΣL ≦ 0.13.
[0037]
　11 the width of the vertical wall 3 at the end of the member 12 of FIG. 4 shows a comparison of the maximum load of changing the width of the top plate 2. Both section line length L is 300 mm. Material of the member 12 is the same as the analysis of FIG. Analysis As shown in FIG. 12, the member 12 is disposed within the hat member, simulating a case of inputting a shock load from the top plate surface of the hat member. As a result, a result of the load-bearing is improved similarly .SIGMA.R / .SIGMA.L ≦ 0.13 and 8 were obtained.
[0038]
　The member 12 of FIG. 4, FIG. 9, were subjected to analysis of Figure 12 in the model corresponding to FIG. 10, the same results as member 1 was obtained. That is, regardless of the shape of the member 1 and 4 of the member 12 in the flange 11 of Figure 3 (width of the vertical wall 3 of the member end portion, the top plate 2 of the width, vertical wall angle R), the .SIGMA.R / .SIGMA.L ≦ 0.13 showing high load capacity (maximum load) in the case.
[0039]
　Member 12 of the member 1 and 4 in FIG. 3, the shape although different, the point indicating a high load-bearing (maximum load) in the case of .SIGMA.R / .SIGMA.L ≦ 0.13 are common.
[0040]
　2. Apparatus and a method for manufacturing members 1, 12
　member of the present invention (part 1, member 12) when prepared by press forming, can be prepared by two processes. The first step, some shrinkage flanging of the vertical wall flange 10 continuous through the floor flange 9 and the flange ridge 8 on the floor flange 9. The second step is performed next to the first step, forming the remainder of the top plate flange 11 and the top plate a vertical wall flange 10 that did not molded in a first step of continuous flange 11. The flow of process in the case of producing a member of the present invention by press molding shown in FIG. 13. In the first step, to produce the intermediate product 27 from the blank 26, 34. To produce a preform 35 using Case1-1 the manufacturing apparatus 30 that uses the manufacturing apparatus 20 to the manufacturing process, the production of the intermediate molded article 27 from the preform 35 by using the manufacturing apparatus 40 Case1- Although 2 is exemplary, and may be either way. In a second step member 1 from the intermediate molded article 27, to produce the member 12. Although Case2-2 is exemplified to use Casse2-1 the manufacturing apparatus 60 that uses the manufacturing apparatus 50 to the manufacturing method, it may be either way.
[0041]
(1) Case1-1 (first step, the manufacturing apparatus 20)
　device 20, a portion of the vertical wall flange 10 to the blank 26 by press molding successively through the floor flange 9 and the flange ridge 8 on the floor flange 9 the shrinkage was flanging, to produce an intermediate molded article 27.
[0042]
　Figure 14 is an explanatory view showing a manufacturing device 20. Figure 15 is an explanatory view showing an arrangement of a molding before the start of the blank 26 in the manufacturing apparatus 20. Figure 16 is an explanatory diagram showing a status of a molding bottom dead center by the manufacturing apparatus 20, the punch 21 is omitted as to make the drawings easy to see.
[0043]
　Manufacturing apparatus 20, as shown in FIG. 14 has a punch 21, and with projections die 22, a pad 23. With projections die 22 is arranged opposite the punch 21. With projections die 22 is provided integrally with the bending tool 25 includes a projection 24. Bending tool 25, the die 22 may be configured as separate bodies.
[0044]
　Manufacturing apparatus 20, as shown in FIGS. 14-16, by the protrusions 24, the portion corresponding to the flange ridge 8 in the blank 26 to press before the portion other than the projection 24 of the bending tool 25, a portion to be molded to the flange ridge 8 in stretch flangeability is shear deformation. Thus, the manufacturing apparatus 20, forming the blank 26 into the intermediate molded article 27 with a flange ridge 8. Site 28 that will be formed in the top plate flange 11 of the intermediate molded article 27, may not be molded by the manufacturing apparatus 20.
[0045]
　This method, the reason why the occurrence of wrinkles is suppressed and around flange ridge 8, will be described.
[0046]
　By pressing ahead at least a part of the portion to be molded to the flange edge line 8 by protrusions 24, the deformation speed difference occurs in the prior to pressing the region to the other region. Therefore, it is possible to increase the element of shear deformation field at the portion to be molded to the flange ridge 8 reliably.
[0047]
　In other words, by using the bending tool 25 includes a projection 24, the deformation element of the flange ridge 8, shrinkage flange deformation field (strain ratio β (ε2 / ε1) <- 1: thickening) shear deformation from If (strain ratio β (ε2 / ε1) ≒ -1: plate thickness no change) in order to vary the. In addition, the meat more than that occurring in the flange edge line 8, are dispersed extruded into the surrounding. These result, can be effectively suppressed wrinkles and excessive thickness increases occurring in and around the flange ridge 8.
[0048]
　Pressing the projections 24, that it is preferable that the circumferential length direction of the center position of the flange ridge 8 may be performed on a position shifted from the circumferential length direction of the center position of the flange ridge 8.
[0049]
　The height of the projection 24 provided on the surface of the bending tool 25 h (mm), it is desirable to satisfy the following formula (1) with respect to the radius of curvature rf of bending the flange ridge 8 (mm). The height h of the protrusion 24 becomes smaller effect of suppressing the increase in thickness to form a shear deformation field to the flange ridge 8 is less than (0.5 × rf), also, (3.5 × rf) there is a possibility of causing to be greater than the damage to the protrusion 24.
　0.5 × rf ≦ h ≦ 3.5 × rf ······· (1)
[0050]
　Thus, the manufacturing apparatus 20, in a first step, the blank 26, a punch 21, by using a nubbed die 22, a pad 23, a portion where the protrusion 24 corresponds to the flange ridge 8, the protrusion by pressing before the portion other than 24, forming the intermediate molded article 27.
[0051]
(2) Case1-2 (first step, the manufacturing apparatus 30, the manufacturing apparatus 40)
　FIG. 17 is an explanatory view showing a manufacturing apparatus 30 used in Case1-2. Figure 18 is an explanatory view showing the blank 34 prior to the start of the preform in the manufacturing apparatus 30. Figure 19 is an explanatory view showing a preform 35 that is manufactured preformed by the manufacturing apparatus 30. 17-19 illustrate one half of the manufacturing apparatus 30. Omitted as the die 31 for clarity of illustration 18, the drawing in FIG. 19 of the manufacturing apparatus 30.
[0052]
　Manufacturing apparatus 30 includes a die 31, a pad 32, and a punch 33 disposed opposite to the die 31 and the pad 32, by performing press forming on the blank 34, a portion corresponding to the floor flange 9 molded to, to produce a preform 35.
[0053]
　Figure 20 is an explanatory view showing a manufacturing device 40. Figure 21 is an explanatory view showing the arrangement of the preform 35 before the start forming in the manufacturing apparatus 40. Figure 22 is an explanatory diagram showing a status of a molding bottom dead center by the manufacturing apparatus 40. In Figure 21, the punch 36 is omitted as to make the drawings easy to see. Further, the upper right view in FIG. 21 shows a punch 36 with a broken line.
[0054]
　Manufacturing apparatus 40, to mold the preform 35 into the intermediate molded article 27. Tool that constitutes the manufacturing apparatus 40 includes a punch 36, a die 37 which is disposed opposite to the punch 36, out-of-plane deformation suppressing tool to be disposed in the vicinity of the portion corresponding to the flange edge line 8 so as to face the punch 36 and 38, a pad 39. Using these tools, at the start molding while restraining pressing the preform 35 by a punch 36 and pad 39, it is molded by molding a portion corresponding to the flange edge line 8 of the preform 35 to the intermediate molded article 27.
[0055]
　During press-molding, by restraining the portion corresponding to the floor flange 9 of the preform 35 by the side of the out-of-plane deformation suppressing tool 38 and the punch 36, to suppress the out-of-plane deformation of the parts during molding .
[0056]
　Out-of-plane deformation suppressing tool 38, from the side of the punch 36, by providing a gap obtained by adding the clearance necessary in the thickness of the plate thickness of the preform 35, are arranged.
[0057]
　Specifically, out-of-plane deformation suppressing tool 38, the preform 35 during press molding so as to face the surface of the portion corresponding to the floor flange 9, the thickness of the plate of the preform 35 at a predetermined distance x it is preferably disposed with a gap. As a result, it is possible to reliably suppress the out-of-plane deformation of a portion corresponding to the floor flange 9. The predetermined distance x (2) formula: 1.00 × t ≦ x <1.40 × t ( however, t: a distance (mm): thickness of the preform 35 (mm), x) defined by It is.
　In addition, the plate thickness and flange ridge 8 in which the plate thickness than the plate thickness of the front press molding of the preform 35 is increased in the area of its peripheral, even greater than 1.5 times the plate thickness before the press forming with a maximum not so. Incidentally, it is better to provide a slight clearance in order to suppress the galling mold during molding. Further, since the occurrence of the out-of-plane deformation becomes conspicuous when the plate thickness is thin, while the out-of-plane deformation suppressing tool 38 and punch 36 have a clearance of a predetermined distance x direction of the thickness of the preform 35 It is desirable Predetermined distance x, (3): by 1.03 × t ≦ x <1.35 × t ( a distance (mm) provided that, t:: thickness of the preform 35 (mm), x) It is defined.
　Also, out-of-plane deformation suppressing tool 38 may be provided in the die 37, but are not limited to this example. Out-of-plane deformation suppressing tool 38 may if restraining a portion corresponding to the floor flange 9 in the preform 35. Therefore, the installation position of the out-of-plane deformation suppressing tool 38 is not limited to a particular position. Also, out-of-plane deformation suppressing tool 38 rather than in association with the upper mold may be arranged as the lower mold.
[0058]
　Thus, the manufacturing apparatus 30 performs press forming blank 26 with pad 32, a die 31 and a punch 33. Thus, to produce the preform 35 which is molded a portion corresponding to the floor flange 9. Then the manufacturing apparatus 40, a punch 36, a die 37, the out-of-plane deformation suppressing tool 38, by molding a portion corresponding to the flange edge line 8 of the preform 35 with the pad 39, the intermediate molded article molded to 27.
　Although not shown, in the first step, the blank holder, which is arranged opposite the die 22 and 31 may be performed press molding while pressing the blank 26, 34 together with the die 22 and 31.
[0059]
(3) Case2-1 (second step, the manufacturing apparatus 50)
　FIG. 23 is an explanatory view showing a configuration of a manufacturing apparatus 50. Figure 24 is an explanatory view showing the disposition of an intermediate molded article 27 in the manufacturing apparatus 50. Figure 25 is an explanatory diagram showing a status of a molding bottom dead center in the manufacturing device 50. In Figure 25 omitted as the die 53.
　As shown in FIGS. 23-25, the manufacturing apparatus 50, a die 53 for supporting the punch 51 having the inner pad 52 freely disposed out of the punch top 51a, a die pad 54 while being arranged opposite to the punch 51 provided with a door.
　The second device 50, in the second step, starts the press-molding the intermediate molded article 27 away from the punch top 51a with the inner pad 52 and the die pad 54. More specifically, in a state of projecting the inner pad 52, to hold the intermediate product 27, 40 between the inner pad 52 and the die pad 54. Next, the die 53 is moved down, the die 53 pushes the die pad 54, the molded intermediate product 27, 40 and the inner pad 52 is pushed by the flow proceeds to the die pad 54. The molding bottom dead center, in a state in which the inner pad 52 is housed in the punch 51. This makes it possible to mold a portion not molded in the first step of the vertical wall flange 10 in member 1,12, the top plate flange 11, the upper edge line 4.
[0060]
(4) Case2-2 (second step, the manufacturing apparatus 60)
　FIG. 26 is an explanatory view showing a configuration of a manufacturing apparatus 60. Figure 27 is an explanatory view showing the disposition of an intermediate molded article 27 in the manufacturing apparatus 60. Figure 28 is an explanatory view showing the condition of the hold of the edge line pad 63 in the manufacturing apparatus 60. Further, FIG. 29 is an explanatory diagram showing a status of a molding bottom dead center in the manufacturing device 60. Die 62 in FIG. 29 will be omitted.
[0061]
　As shown in FIGS. 26-29, the second device 60, a punch 61, a die 62 which is disposed opposite to the punch 61, each end top plate ridge 6 and the upper edge line 4 and the vertical wall ridge 7 and a ridge line pad 63 for pressing the part to be molded in place lead.
[0062]
　Manufacturing apparatus 60, in a second step, press molded with ridges pad 63. Ridge pad 63 presses the portion to be formed at a position top plate ridge lines 6 and the upper edge line 4 and the vertical wall ridge line 7 each end of the intermediate molded article 27 is connected. In this way, forming the ends and the top plate ridge lines 6 and top plate flange 11 of the upper ridge line 4. Next, forming the upper ridge 4 the die 62 is moved towards the punch 61 to the intermediate molded article 27. In this way, the production of members 1,12. This makes it possible to mold a portion not molded in the first step of the vertical wall flange 10 in member 1,12, the top plate flange 11, the upper edge line 4.
DESCRIPTION OF SYMBOLS
[0063]
1 member
2 the top plate
3 the vertical wall
4 above the ridge line
5 under ridge
6 top plate ridge line
7 vertical wall ridge
8 flange ridge
9 floor flange
10 vertical wall flange
11 top plate flange
12 members (vertical wall
triangle) 26 expanded blank
27 intermediate molded goods

The scope of the claims
[Requested item 1]
　A member comprising a vertical wall facing the two through the upper ridge line on both sides of the top plate and top plate,
　extending outwardly of the member through the top plate ridge on the end portion side of the member of the top plate top plate flange and
　the longitudinal wall through said vertical wall ridge extending on the end side of the member with the two vertical walls extending flange outwardly of the member
　and the end portion of the adjacent said vertical wall flange said vertical wall comprises two floor flanges extending outwardly of the member through the lower ridge extending to an end of another of said longitudinal walls,
　each floor flange adjacent continuously by the vertical wall flange and its end,
　the at the end of the member, .SIGMA.L sum of the top plate and the vertical wall of a width in the curvature of the vertical wall corner radius sum .SIGMA.R and member end between the lower ridge and the vertical wall ridges, ΣR / ΣL ≦ 0.13 characterized in that it is a relationship member.
[Requested item 2]
　Wherein the radius of curvature of the corner of the vertical wall between the lower edge line said vertical wall ridge is 20mm or less A member according to claim 1.
[Requested item 3]
　Wherein the vertical wall flange and the top plate flanges are continuous member of claim 1 or claim 2.
[Requested item 4]
　The vertical wall is triangular, wherein the floor flange also serves as the vertical wall flange, member according to any one of claims 1 to 3.
[Requested item 5]
　A method of manufacturing a member as claimed in any one of claims 4,
flange shrinkage each part of the vertical wall flange contiguous to at least two positions of the blank and at least a portion of the floor flange on the floor flange first step and of forming
each stretched at least two positions to the remainder of the vertical wall flanges continuous with the top plate flange to the top plate flange between at least two places in the first step of the blank next to the first step second, characterized in that it comprises the step, a manufacturing method of a press molded article flanging.