JP4622624B2 - Pre-formed body, hydraulic forming method and hydraulic forming member - Google Patents

Description

  The present invention relates to a preform, a hydraulic forming method, and a hydraulic forming member.

The conventional structural member supplements the strength by arranging the reinforcing ribs on the inner side. The hydraulic forming member applied to the structural member is manufactured by supplying hydraulic pressure to the inside of a preformed body having an outer surface material and a reinforcing material, and bulging and deforming (see, for example, Patent Document 1).
JP 2003-320960 A

  However, when connecting a plurality of structural members to form a connecting portion having a branch portion, it is difficult to efficiently supplement the strength of the connecting portion because the reinforcing ribs arranged inside do not continue at the branch portion. Has some problems.

  The present invention has been made in order to solve the problems associated with the prior art described above, and is a preformed body and a hydraulic molding method for obtaining a hydraulic molded member having a branch portion with good strength, and good strength. It is an object of the present invention to provide a hydraulic forming member having a bifurcated portion.

In order to achieve the above object, the invention described in claim 1
An outer surface portion having a branch portion having an extended portion extending in at least three directions and having a central portion where the extended portions are gathered, having an edge portion that is overlapped and joined; and
Having first and second reinforcing ribs that partition the hollow cross section of the outer surface portion;
The first and second reinforcing ribs each have an extended portion and a central portion that are opposed to the extended portion and the central portion of the branch portion, respectively.
The opposing inner surfaces of the expansion part and the central part of the first and second reinforcing ribs are joined to each other,
The lateral surfaces of the expanded portion and the central portion of the first and second reinforcing ribs are respectively joined to the expanded portion of the outer surface portion and the inner surface of the central portion ,
The inner surface joining portion at the central portion of the first and second reinforcing ribs is a hydroformed member characterized by defining a closed surface corresponding to the shape of the branching portion .

In order to achieve the above object, the invention according to claim 11 provides:
First and second outer surface materials having edge portions that are overlapped and joined, and forming the outer surface portion of the hydroformed member; and
The first and second reinforcing members, which are disposed inside the first and second outer surface materials and form first and second reinforcing ribs that partition the hollow cross section of the hydroformed member;
The first and second outer surface materials each include a branch portion having an extended portion extending in at least three directions and a central portion where the extended portions are assembled,
The first and second reinforcing members each have an extended portion and a central portion that are opposed to the extended portion and the central portion of the branch portion, respectively.
The opposing inner surfaces of the expansion portion and the central portion of the first and second reinforcing members are joined to each other,
The outer surface of the first and second reinforcing members and the outer surface of the central portion are joined to the inner surface of the first and second outer surface members of the outer surface portion and the central portion, respectively .
The inner surface joint portion in the central portion of the first and second reinforcing members is a preformed body that defines a closed surface corresponding to the shape of the branch portion .

In order to achieve the above object, the invention described in claim 19 provides:
First and second outer materials having edges joined in superposition, and
Having first and second reinforcing members disposed inside the first and second outer surface materials;
The first and second outer surface materials each include a branch portion having an extended portion extending in at least three directions and a central portion where the extended portions are assembled,
The first and second reinforcing members each have an extended portion and a central portion that are opposed to the extended portion and the central portion of the branch portion, respectively.
The opposing inner surfaces of the expansion portion and the central portion of the first and second reinforcing members are joined to each other,
The outer surface of the first and second reinforcing members and the outer surface of the central portion are respectively inside the preforms that are joined to the inner and outer surfaces of the first and second outer surface members of the outer surface portion, respectively.
Apply hydraulic pressure, bulge and deform,
The first and second outer surface materials form an outer surface portion of a hydroformed member having a branch portion having an expansion portion and a central portion where the expansion portions gather,
In the hydraulic forming method for forming the first and second reinforcing ribs that partition the hollow section of the hydraulic forming member by the first and second reinforcing members, respectively ,
The inner surface joint portion at the central portion of the first and second reinforcing members defines a closed surface corresponding to the shape of the branch portion, and applies a hydraulic pressure to the inside of the preform to bulge out When deforming, the inner surface joining portion suppresses the material surplus of the first and second reinforcing materials .

According to the first aspect of the present invention, the reinforcing ribs are continuously arranged on the inner side of the extended portion and the central portion of the branch portion in the hydraulic forming member. Therefore, the strength of the branching portion is efficiently improved. Moreover, the inner surface joint part in the center part of the 1st and 2nd reinforcement rib defines the closed surface corresponding to the shape of a branch part, and can suppress the material surplus of the 1st and 2nd reinforcement material. . That is, it is possible to provide a hydroformed member having a branch portion that can suppress the material surplus of the first and second reinforcing members and has good strength.

According to invention of Claim 11 , the 1st and 2nd reinforcement material is continuously arrange | positioned inside the expansion part and center part of the branch part in the 1st and 2nd outer surface material of a preforming body. . Therefore, when applying a hydraulic pressure to the preformed body to cause bulging deformation, reinforcing ribs are continuously arranged inside the expansion part and the central part of the branch part in the hydraulic forming member, and the branch part It is possible to efficiently improve the strength of the. Further, since the inner surface joint portion at the central portion of the first and second reinforcing members defines a closed surface corresponding to the shape of the branch portion, a fluid pressure is applied to the inside of the preform and the bulge is formed. When making it deform | transform, the material surplus of a 1st and 2nd reinforcement material can be suppressed by an internal surface junction part. That is, it is possible to provide a preformed body for obtaining a hydraulically molded member having a branch portion with good strength , which can suppress the material surplus of the first and second reinforcing materials .

According to the nineteenth aspect of the present invention, since the reinforcing ribs are continuously arranged inside the expansion portion and the central portion of the branch portion in the hydraulic forming member, the strength of the branch portion of the hydraulic forming member is improved. Can be improved. In addition, when applying a hydraulic pressure to the inside of the preform and causing it to bulge and deform, the inner surface joining portion can suppress the material surplus of the first and second reinforcing materials. In other words, it is possible to suppress the material more than the first and second reinforcing members, and can provide a hydroforming method for strength obtain hydroforming member having good branching unit.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view for explaining a hydraulic forming member according to Embodiment 1, and FIG. 2 is a perspective view for explaining a vehicle body structural member to which the hydraulic forming member shown in FIG. 1 is applied. is there.

  The hydroforming member 110 includes an outer surface portion including a branch portion 112 having an expansion portion 116 and a central portion 114, and reinforcing ribs (first and second reinforcing ribs) 140 and 150 that partition the hollow cross section of the outer surface portion. Have. The expansion part 116 extends in three directions from the central part 114 and has a tridental shape (T-shape). That is, the extended part 116 is gathered at the central part 114. The outer surface portion has an edge portion 160 joined in an overlapping manner, and the end surface of the expansion portion 116 has an opening 118.

  Reinforcing ribs 140 and 150 have an extended portion and a central portion that are opposed to extended portion 116 and central portion 114, respectively. The opposing inner surfaces of the expansion portion and the central portion of the reinforcing ribs 140 and 150 are joined to each other. The lateral surfaces of the expansion portion and the central portion of the reinforcing ribs 140 and 150 are joined to the inner surface of the expansion portion 116 and the central portion 114 of the outer surface portion, respectively, and the side joint 162 is connected to the expansion portion 116 and the central portion 114. Each extends along.

  The inner surface joint portion 164 at the central portion of the reinforcing ribs 140 and 150 defines a closed surface corresponding to the shape of the central portion 114 of the hydroformed member 110. Since the extended portion 116 extends in three directions, the closed surface is set to be approximately triangular. The substantially triangular inner surface joining portion 164 suppresses the material surplus of the first and second reinforcing materials that constitute the reinforcing ribs 140 and 150 during the hydraulic forming for manufacturing the hydraulic forming member 110. It is provided to do.

  The central portions of the reinforcing ribs 140 and 150 have openings 148 and 158 located inside the closed surface defined by the inner surface joint 164, respectively. The openings 148 and 158 are arranged in order to reduce the weight of the hydraulic forming member 110. Since the vicinity of the closed surface is substantially flat and is a region having a poor reinforcing function, the influence on the strength due to the formation of the openings 148 and 158 is small and preferable.

  The inner surface joint portion 166 at the expansion portion of the reinforcing ribs 140 and 150 extends substantially at the center of the expansion portion and is connected to the inner surface joint portion 164 at the center portion.

  According to the hydraulic forming member 110 according to the first embodiment, the reinforcing ribs 140 and 150 are continuously arranged inside the expansion portion 116 and the central portion 114 of the branch portion 112, and the strength of the branch portion 112 is determined. Has improved efficiently. Therefore, when the hydraulic forming member 110 is applied to, for example, the trident connecting portion 100 for connecting the side sill 102 and the center pillar 104 in an automobile, the strength of the trident connecting portion 100 is improved and made strong. It is possible.

  Next, a method for manufacturing the hydraulic forming member 110 will be described.

  3 is a plan view for explaining the preform according to the first embodiment, FIG. 4 is a rear view of the preform shown in FIG. 3, and FIG. 5 is a cross section taken along line V-V in FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 3, and FIG. 7 is a plan view for explaining a reinforcing material of the preform shown in FIG.

  The preform 10 includes an upper plate (first outer surface material) 20, a lower plate (second outer surface material) 30, an upper middle plate (first reinforcing material) 40, and a lower middle plate (second reinforcing material) 50. . The upper plate 20 and the lower plate 30 have substantially the same trigeminal shape (T-shape), and are members that form the outer surface portion of the hydraulic forming member 110. The upper middle plate 40 and the lower middle plate 50 are members that form first and second reinforcing ribs that partition the hollow section of the outer surface portion.

  The upper plate 20 and the lower plate 30 correspond to the shape of the outer surface portion of the hydraulic forming member 110, and the extended portions 26 and 36 extending in three directions, and the central portions 24 and 34 where the extended portions 26 and 36 are gathered. The branch parts 22 and 32 which have are respectively included. The overlapped edge portion 60 of the upper plate 20 and the lower plate 30 is joined over the entire circumference. Reference numeral 61 denotes an edge joint portion.

  The joining of the edge portion 60 is not particularly limited as long as it has an appropriate adhesive strength and sealability is secured along the joining portion. For example, laser welding, plasma welding, or electric resistance welding is possible. Spot welding and seam welding can be applied.

  The extended portion 26 of the upper plate 20 has an end portion on which a dome-shaped portion 27 that is a curved convex portion is formed. The extended portion 36 of the lower plate 30 has an end portion in which an opening 37 aligned with the dome-shaped portion 27 is formed. The opening 37 is used for injecting a molding medium, applying a hydraulic pressure to the inside of the preformed body 10, and bulging and deforming.

  The upper middle plate 40 and the lower middle plate 50 have substantially the same trigeminal shape (T-shape) and are smaller than the upper plate 20 and the lower plate 30. The upper middle plate 40 and the lower middle plate 50 are disposed inside the upper plate 20 and the lower plate 30, and have the expansion portions 46 and 56 and the central portions 44 and 54 opposite to the expansion portions 26 and 36 and the central portions 24 and 34. Have each.

  The opposing inner surfaces of the expansion portions 46 and 56 and the central portions 44 and 54 of the upper intermediate plate 40 and the lower intermediate plate 50 are joined to each other. The inner surface joint 64 at the central portions 44, 54 defines a closed surface corresponding to the shape of the central portions 44, 54. Since the extended portions 46 and 56 extend in three directions, the closed surface is set to be approximately triangular. The substantially triangular inner surface joining portion 64 has a function of suppressing the material surplus of the upper intermediate plate 40 and the lower intermediate plate 50 during the hydraulic forming.

  The central portions 44 and 54 of the upper middle plate 40 and the lower middle plate 50 have openings 48 and 58 located inside the closed surface, respectively. The openings 48 and 58 are disposed in order to reduce the weight of the preform 10 (hydraulic molding member 110). Since the vicinity of the closed surface is substantially flat in the hydroformed member 110 and becomes a region having a poor reinforcing function, the influence on the strength due to the formation of the openings 48 and 58 (openings 148 and 158) is small. ,preferable.

  The inner surface joint portion 66 in the extension portions 46 and 56 extends substantially at the center of the extension portions 46 and 56 and is connected to the inner surface joint portion 64 in the center portions 44 and 54. A connection point between the inner surface bonding portion 66 and the inner surface bonding portion 64 is a corner portion of the closed surface.

  The outer surfaces of the extended portions 46 and 56 and the central portions 44 and 54 of the upper intermediate plate 40 and the lower intermediate plate 50 are joined to the extended portions 26 and 36 of the upper plate 20 and the lower plate 30 and the inner surfaces of the central portions 24 and 34, respectively. ing. That is, the outer surface joint portions 62 of the upper middle plate 40 and the lower middle plate 50 extend along the sides of the extended portions 46 and 56 and the central portions 44 and 54 of the upper middle plate 40 and the lower middle plate 50, respectively. . The end surfaces of the expansion parts 46 and 56 are not joined and have non-joined parts.

  The joining of the reinforcing ribs 140 and 150 is not particularly limited as long as it has an appropriate adhesive strength. For example, the above-described welding method can be applied, and intermittent joining is also possible. It is.

  According to the preformed body 10 according to the first embodiment, the upper middle plate 40 and the lower portion are disposed inside the extended portions 26 and 36 and the central portions 24 and 34 of the branch portions 22 and 32 in the upper plate 20 and the lower plate 30. The middle plate 50 is continuously arranged. Therefore, when the hydraulic pressure is applied to the inside of the preformed body 10 to cause the bulging deformation, the reinforcing ribs 140 and 150 are continuously provided inside the expansion portion 116 and the central portion 114 of the branch portion 112 in the hydraulic pressure forming member 110. Thus, the strength of the branch portion 112 can be efficiently improved.

  The preformed body 10 is manufactured by, for example, joining the upper inner plate 40 and the lower inner plate 40 and the lower inner plate 50, in which the expansion inner surfaces 46 and 56 and the inner surfaces of the central portions 44 and 54 are joined to each other. The inner surface of the upper plate 20 and the lower intermediate plate 50 are arranged on the inner side of the plate 30 and positioned. 36 and the inner surfaces of the central portions 24 and 34 are sequentially joined to each other, and the overlapping edge portions 60 of the upper plate 20 and the lower plate 30 are joined over the entire circumference. Although there is, it is not limited to this in particular.

  8 is a cross-sectional view for explaining the hydraulic forming apparatus according to Embodiment 1, FIG. 9 is a plan view for explaining the upper mold of the hydraulic forming apparatus shown in FIG. 8, and FIG. It is a top view for demonstrating the lower mold | type of the hydraulic-molding apparatus shown by FIG.

  The hydraulic molding apparatus according to Embodiment 1 includes a molding die (upper mold 170 and lower mold 180) and a hydraulic pressure supply mechanism 190. The upper mold 170 and the lower mold 180 are installed so as to be close to and away from each other, and the preformed body 10 is arranged on the inner side and the mold is clamped.

  The upper mold 170 and the lower mold 180 have cavity surfaces 171 and 181 and pressing portions 175 and 185. The cavity surfaces 171 and 181 integrally correspond to the outer surface portion of the hydraulic forming member 110. The pressing portions 175 and 185 are portions that grip the outer periphery of the preformed body 10 by clamping.

  The pressing portion 175 of the upper mold 170 includes a concave portion 176 extending from the cavity surface 171 and arc-shaped grooves 177 and 178 disposed so as to surround the distal end portion 176A of the concave portion 176. The distal end portion 176A has a cross-sectional shape corresponding to the outer shape of a portion obtained by dividing the dome-shaped portion 27 in the extended portion 26 of the upper plate 20 into two in the vertical direction. The center of the arc-shaped grooves 177 and 178 is the center of the tip portion 176A. The pressing part 185 of the lower mold 180 has a substantially rectangular recess 186 in which the nozzle part 191 is disposed.

  The hydraulic forming apparatus according to the first embodiment further includes large and small spacers (not shown) disposed between the pressing portion 175 of the upper mold 170 and the pressing portion 185 of the lower mold 180. The upper mold 170 and the lower mold 180 are configured to be clamped in two stages.

  The thickness of the large spacer is set corresponding to the total thickness of the upper plate 20, the lower plate 30, the upper middle plate 40 and the lower middle plate 50. The thickness of the small spacer is set corresponding to the total thickness of the upper plate 20 and the lower plate 30.

  The hydraulic pressure supply mechanism 190 is connected to, for example, a pressure generating device using a pressure increasing cylinder and a forming medium source, and includes a flow path 198 and a nozzle portion 191 connected to the hydraulic pressure circuit 199. The flow path 198 extends inside the lower mold 180 and reaches the nozzle portion 191. The forming medium is, for example, water.

  The nozzle portion 191 includes a dome-shaped portion 192 corresponding to the inner surface of the dome-shaped portion 27 in the extended portion 26 of the upper plate 20, and annular convex portions 194, 195 disposed so as to surround the dome-shaped portion 192. The annular convex portions 194 and 195 are aligned with the arc-shaped grooves 177 and 178 of the pressing portion 175 of the upper mold 170.

  The sizes of the annular convex portions 194 and 195 are smaller than the sizes of the arc-shaped grooves 177 and 178 and are set in consideration of the thicknesses of the upper plate 20 and the lower plate 30. The arc-shaped grooves 177 and 178 and the annular convex portions 194 and 195 can be omitted as appropriate.

  The dome-shaped portion 192 has an inlet 193 that communicates with the flow path 198, and can be inserted into the opening 37 in the extended portion 36 of the lower plate 30. When the nozzle portion 191 is inserted into the opening portion 37 and disposed in the dome-shaped portion 27 of the preformed body 10, the forming medium supplied from the hydraulic circuit 199 passes through the nozzle portion 191 and the opening portion 37 and is spared. It is introduced into the molded body 10. Therefore, the forming medium can apply a hydraulic pressure to the inside of the preform 10 to bulge and deform the preform 10.

  Next, the hydraulic forming method according to Embodiment 1 will be described. 11 is a cross-sectional view for explaining mold clamping, FIG. 12 is a cross-sectional view for explaining the completion of hydraulic forming, FIG. 13 is a cross-sectional view taken along line XIII-XIII in FIG. 12, and FIG. It is sectional drawing for demonstrating the hydraulic forming member immediately after taking out.

  The preform 10 is disposed on the lower mold 180, and the opening 37 of the lower plate 30 is positioned on the dome-shaped portion 192 of the nozzle portion 191 of the hydraulic pressure supply mechanism 190.

  Thereafter, the upper mold 170 that has been retracted to the standby position descends and approaches the lower mold 180, whereby the upper mold 170 and the lower mold 180 are clamped (see FIG. 11). At this time, the dome-shaped portion 27 of the upper plate 20 is fitted to the distal end portion 176A of the concave portion 176 located in the pressing portion 175 of the upper mold 170. A large spacer (not shown) is disposed between the pressing portions 175 and 185.

  The vicinity of the dome-shaped portion 27 is gripped by the arc-shaped grooves 177 and 178 in the pressing portion 175 of the upper die 170 and the annular convex portions 194 and 195 in the nozzle portion 191 disposed in the concave portion 186 of the lower die 180. . Thereby, a bent portion is formed in an annular shape in the vicinity of the dome-shaped portion 27, and the sealing performance for the introduced forming medium is improved.

  The hydraulic pressure supply mechanism 190 introduces the molding medium supplied from the hydraulic circuit 199 into the preformed body 10 via the nozzle portion 191 and the opening portion 37 and applies the hydraulic pressure. As a result, the preformed body 10 bulges and deforms, the edge of the preformed body 10 moves toward the cavity surfaces 171 and 181, and material inflow is caused.

  When the upper middle plate 40 and the lower middle plate 50 move to the cavity surfaces 171 and 181, a large spacer (not shown) disposed between the pressing portions 175 and 185 is changed to a small spacer. The upper mold 170 corresponds to the thickness of the small spacer, and is further lowered and clamped to ensure a predetermined clearance corresponding to the thickness of the edge of the preform 10.

  As the supply of the forming medium continues, the upper middle plate 40 and the lower middle plate 50 that are joined to the upper plate 20 and the lower plate 30 that bulge and deform are pulled and stretched. At this time, the substantially triangular inner surface joining portion 64 suppresses the material surplus of the upper middle plate 40 and the lower middle plate 50.

  When the hydraulic pressure of the preform 10 reaches the final set value, the supply of the forming medium is stopped and held for a predetermined time, whereby the bulge of the preform 10 is completed (see FIG. 12). Accordingly, the upper plate 20 and the lower plate 30 form an outer surface portion of the hydraulic forming member 110, and the upper intermediate plate 40 and the lower intermediate plate 50 are reinforcing ribs 140 and 150 that partition the hollow cross section of the hydraulic forming member 110. Will be formed.

  After the pressure is released, the upper mold 170 is raised and the mold is opened, and the hydraulic forming member (see FIG. 14) 110 is taken out. The dome-shaped portion and the opening located at the end 117 of the expansion portion 116 of the hydroforming member 110 are appropriately deleted (trimmed) to form the opening 118.

  According to the hydraulic molding method according to the first embodiment, since the reinforcing ribs 140 and 150 are continuously arranged inside the expansion part 116 and the central part 114 of the branching portion 112 in the hydraulic molding member 110, It is possible to efficiently improve the strength of the branch portion 112 of the hydraulic forming member 110.

  Note that the opening 37 and the dome 27 for injecting the forming medium in the upper plate 20 and the lower plate 30 are arranged in each of the expansion portions 26 and 36 or only in the single expansion portion 26 and 36. It is also possible to do. Further, the upper intermediate plate 40 and the lower intermediate plate 50 are configured so as to be disposed from the beginning in the internal molding spaces of the cavity surfaces 171 and 181 of the hydraulic forming device, and the applied spacer is one type. The mold clamping can be performed once.

  As described above, Embodiment 1 includes a preformed body and a hydraulic forming method for obtaining a three-pronged hydraulic forming member having a branch portion with good strength, and a three-pronged shape having a branch portion with good strength. It is possible to provide a hydraulic forming member.

  It should be noted that the openings 48 and 58 located inside the closed surfaces of the central portions 44 and 54 of the upper intermediate plate 40 and the lower intermediate plate 50 (closed defined by the inner surface joint portions 164 at the central portions of the reinforcing ribs 140 and 150). The openings 148 and 158) located on the inner side of the surface can be omitted as appropriate.

  FIG. 15 is a perspective view for explaining the hydraulic forming member according to the second embodiment, and FIG. 16 is a perspective view for explaining a vehicle body structural member to which the hydraulic forming member shown in FIG. 15 is applied. is there. In addition, about the member which has the function similar to Embodiment 1, the same code | symbol is used and in order to avoid duplication, the description is abbreviate | omitted.

  The hydraulic forming member 310 is generally different from the hydraulic forming member 110 according to the first embodiment in that the expansion part 316 extends from the central part 314 in four directions and has a four-fork shape (cross shape). Yes.

  More specifically, the reinforcing ribs 340 and 350 have an extended portion and a central portion that face the extended portion 316 and the central portion 314 of the branch portion 312, respectively. The opposing inner surfaces of the expansion portion and the central portion of the reinforcing ribs 340 and 350 are joined to each other. The lateral surfaces of the expansion portions and the central portion of the reinforcing ribs 340 and 350 are joined to the inner surfaces of the expansion portion 316 and the central portion 314 of the outer surface portion, respectively, and the lateral joint joint 362 is connected to the expansion portion 116 and the central portion 314. Each extends along.

  The inner surface joint at the central portion of the reinforcing ribs 340 and 350 defines a closed surface corresponding to the shape of the central portion 314 of the hydroformed member 310. Since the expansion part 316 of the branch part 312 extends in four directions, the closed surface is set to a substantially rectangular shape. The substantially rectangular inner surface joining portion suppresses the material surplus of the first and second reinforcing members that constitute the reinforcing ribs 340 and 350 during the hydraulic forming for manufacturing the hydraulic forming member 310. It is provided for this purpose.

  The central portions of the reinforcing ribs 340 and 350 each have an opening located inside the closed surface defined by the inner surface joint. The opening is arranged in order to reduce the weight of the hydraulic forming member 310. The inner surface joint portion 166 at the expansion portion of the reinforcing ribs 340 and 350 extends substantially at the center of the expansion portion and is connected to the inner surface joint portion at the center portion.

  The closed surfaces defined by the inner surface joints at the central portions of the reinforcing ribs 340 and 350 are set to have a substantially rectangular shape because the expanded portion 316 extends in four directions.

  The inner surface joint portion 366 at the expansion portion of the reinforcing ribs 340 and 350 extends substantially at the center of the expansion portion and is connected to the inner surface joint portion at the center portion.

  According to the hydraulic forming member 310 according to the second embodiment, the reinforcing ribs 340 and 350 are continuously arranged inside the expanded portion 316 and the central portion 314 of the branch portion 312, and the strength of the branch portion 312 is determined. Has improved efficiently. Therefore, when the hydraulic forming member 310 is applied to, for example, the four-pronged connecting portion 300 for connecting the side roof rail 302, the center pillar 304, and the roof center 306 in an automobile, the strength of the four-forked connecting portion 300 is improved. It can be made strong.

  17 is a plan view for explaining the preform according to the second embodiment, FIG. 18 is a rear view of the preform shown in FIG. 17, and FIG. 19 is a cross section taken along line XIX-XIX in FIG. 20 is a cross-sectional view taken along line XX-XX in FIG. 17, and FIG. 21 is a plan view for explaining a reinforcing material of the preform shown in FIG.

  The preform 210 includes an upper plate 220, a lower plate 230, an upper middle plate 240, and a lower middle plate 250. The upper plate 220 and the lower plate 230 have substantially the same four-fork shape (cross shape).

  The upper plate 220 and the lower plate 230 include branch portions 222 and 232 each having extended portions 226 and 236 extending in four directions and central portions 224 and 234 in which the expanded portions 226 and 236 are assembled. . The overlapped edge portion 260 of the upper plate 220 and the lower plate 230 is joined over the entire circumference. Reference numeral 261 denotes an edge joint.

  The extended portion 226 of the upper plate 220 has an end portion on which a dome-shaped portion 227 that is a curved convex portion is formed. The extended portion 236 of the lower plate 230 has an end portion in which an opening 237 aligned with the dome-shaped portion 227 is formed. The opening 237 is used for injecting a molding medium, applying a hydraulic pressure to the inside of the preformed body 210, and bulging and deforming.

  The upper middle plate 240 and the lower middle plate 250 have substantially the same four-fork shape (cross shape) and are smaller than the upper plate 220 and the lower plate 230. The upper intermediate plate 240 and the lower intermediate plate 250 are disposed inside the upper plate 220 and the lower plate 230, and have expansion portions 246 and 256 and central portions 244 and 254 that are opposed to the expansion portions 226 and 236 and the central portions 224 and 234. Have each.

  The opposing inner surfaces of the expansion portions 46 and 56 and the central portions 44 and 54 of the upper intermediate plate 240 and the lower intermediate plate 250 are joined to each other. The inner surface joint 264 at the central portions 244 and 254 defines a closed surface corresponding to the shape of the central portions 244 and 254. Since the extended portions 246 and 256 extend in four directions, the closed surface is set to be substantially rectangular. The substantially rectangular inner surface joining portion 264 has a function of suppressing the material surplus of the upper middle plate 240 and the lower middle plate 250 during the hydraulic forming.

  The central portions 244 and 254 of the upper intermediate plate 240 and the lower intermediate plate 250 have openings 248 and 258 located inside the closed surface, respectively. The openings 248 and 258 are arranged to reduce the weight of the preform 210 (hydraulic molding member 310). The vicinity of the closed surface is substantially flat in the hydroformed member 310 and becomes a region having a poor reinforcing function. Therefore, the influence on the strength due to the formation of the openings 248 and 258 is small and preferable.

  The inner surface joint portion 266 at the expansion portions 246 and 256 extends substantially at the center of the expansion portions 246 and 256 and is connected to the inner surface joint portion 264 at the center portions 244 and 254. The connection point between the inner surface joint portion 266 and the inner surface joint portion 264 is a corner portion of the closed surface.

  The outer surfaces of the extended portions 246 and 256 and the central portions 244 and 254 of the upper intermediate plate 240 and the lower intermediate plate 250 are joined to the inner surfaces of the extended portions 226 and 236 and the central portions 224 and 234 of the upper plate 220 and the lower plate 230, respectively. ing. That is, the outer surface joint portions 262 of the upper intermediate plate 240 and the lower intermediate plate 250 extend along the lateral sides of the extended portions 246 and 256 and the central portions 244 and 254 of the upper intermediate plate 240 and the lower intermediate plate 250, respectively. . The end surfaces of the expansion parts 246 and 256 are not joined and have a non-joined part.

  According to the preform 210 according to the second embodiment, the upper middle plate 240 and the lower middle plate 250 are connected to the inner sides of the extended portions 226 and 236 and the central portions 224 and 234 in the upper plate 220 and the lower plate 230. Are arranged. Therefore, when applying a hydraulic pressure to the inside of the preformed body 210 to bulge and deform, the reinforcing ribs 340 and 350 are continuously provided inside the expansion portion 316 and the central portion 314 of the branch portion 312 in the hydraulic pressure forming member 310. Thus, the strength of the branch portion 112 can be efficiently improved.

  Note that the hydraulic pressure forming apparatus and the hydraulic pressure forming method according to the second embodiment are substantially the same as those of the first embodiment, and thus the description thereof is omitted to avoid duplication.

  As described above, the second embodiment includes a preformed body and a hydraulic forming method for obtaining a four-pronged hydraulic forming member having a branch portion having good strength, and four having a branch portion having good strength. It is possible to provide a fork-shaped hydroformed member.

  It should be noted that the opening 248 located inside the closed surface in the central portions 244 and 254 of the upper intermediate plate 240 and the lower intermediate plate 250 (the closed surface defined by the inner surface joint portion in the central portion of the reinforcing ribs 340 and 350). The opening located on the inner side may be omitted as appropriate.

  The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the claims.

  For example, the shape of the upper plate and the lower plate (first and second outer materials that constitute the outer surface portion), the upper intermediate plate, and the lower intermediate plate (reinforcing ribs) according to the configuration of the target hydraulic forming member It is possible to appropriately change the shape of the first and second reinforcing members that constitute the material, the arrangement of the upper and lower intermediate plates in the preform, and the like.

  It is also possible to add another reinforcing material to the space in which the extension part is vacant and arrange it, or to provide five or more extension parts.

  Further, an embodiment is adopted in which an opening is formed by a contact surface between the end surface of the upper plate and the end surface of the lower plate, and the nozzle for introducing the forming medium is introduced from the side. Is also possible.

FIG. 3 is a perspective view for explaining a hydraulic forming member according to the first embodiment. It is a perspective view for demonstrating the vehicle body structural member to which the hydraulic forming member shown by FIG. 1 is applied. FIG. 3 is a plan view for explaining a preform according to the first embodiment. FIG. 4 is a rear view of the preform shown in FIG. 3. FIG. 5 is a cross-sectional view taken along line VV in FIG. 3. FIG. 4 is a cross-sectional view taken along line VI-VI in FIG. 3. It is a top view for demonstrating the reinforcement material of the preforming body shown by FIG. 1 is a cross-sectional view for explaining a hydraulic forming apparatus according to a first embodiment. It is a top view for demonstrating the upper mold | type of the hydraulic-molding apparatus shown by FIG. It is a top view for demonstrating the lower mold | type of the hydraulic-molding apparatus shown by FIG. It is sectional drawing for demonstrating the hydraulic forming method which concerns on Embodiment 1, and has shown clamping. It is sectional drawing for demonstrating the hydraulic forming method which concerns on Embodiment 1, and has shown the time of completion of hydraulic forming. It is sectional drawing regarding line XIII-XIII of FIG. It is sectional drawing for demonstrating the hydraulic forming member method which concerns on Embodiment 1, and has shown the hydraulic forming member just after taking out. FIG. 6 is a perspective view for explaining a hydraulic forming member according to a second embodiment. FIG. 16 is a perspective view for explaining a vehicle body structural member to which the hydraulic forming member shown in FIG. 15 is applied. FIG. 6 is a plan view for explaining a preform according to the second embodiment. It is a rear view of the preform shown in FIG. It is sectional drawing regarding the line XIX-XIX of FIG. It is sectional drawing regarding line XX-XX of FIG. It is a top view for demonstrating the reinforcement material of the preforming body shown by FIG.

Explanation of symbols

10. Pre-formed body,
20 .. Upper plate (first outer surface material),
22 .... Branch part,
24 .. Central part,
26 .. Extension part,
27..Dome part,
30 .. Lower plate (second outer surface material),
32. ・ Branch part,
34 .. Central part,
36 .. Expansion part,
37 .. opening,
40 .. Upper middle plate (first reinforcing material),
44 .. Central part,
46 .. Expansion part,
48 .. opening,
50 .. Lower middle plate (second reinforcing material),
54 .. Central part,
56 .. Extension part,
58 .. opening,
60 .. Edge
61 .. Edge joint,
62 .. Outer surface joint,
64, 66 .. Inner surface joint,
100 .. Trident-shaped connecting part,
102. Side sill,
104 .. center pillar,
110 .. Hydraulic forming member,
112 .. Branching part,
114 .. Central part,
116 .. Expansion site,
117 .. end,
118 .. opening,
140,150 ..first and second reinforcing ribs,
148, 158 .. opening,
160 .. edge
162 .. side joints,
164, 166 .. Inner surface joint,
170 .. Upper mold,
171 .. cavity surface,
175 ..Pressing part,
176 .. Recess,
176A..Tip,
177, 178 .. Arc-shaped groove,
180 ... lower mold,
181 .. cavity surface,
185..Pressing part,
186 .. Recess,
190 .. hydraulic pressure supply mechanism,
191 .. Nozzle part,
192 ... Dome part,
193..Inlet,
194,195 ・ ・ annular convex part,
198 ・ ・ Flow path,
199 ... Hydraulic circuit,
210 .. Pre-formed body,
220 .. Upper plate (first outer surface material),
222 .. Branching part,
224 .. Central part,
226 .. Expansion site,
227 .. Domed part,
230 .. Lower plate (second outer surface material),
232 .. Branching part,
234 .. Central part,
236 .. Expansion site,
237 .. opening,
240 .. Upper middle plate (first reinforcing material),
244 .. Central part,
246 .. Expansion site,
248 .. opening,
250 .. Lower middle plate (second reinforcing material),
254 ... Central part,
256 .. Expansion site,
258 .. opening
260 .. edge
261 .. Edge joint,
262 .. Outer surface joint,
264, 266 .. Inner surface joint,
300 ・ ・ Four-joint joint,
302 .. side roof rail,
304 .. center pillar,
306 .. roof center,
310 .. Hydraulic forming member,
312 .. Branching part,
314 .. Central part,
316 .. Expansion site,
340, 350 .. First and second reinforcing ribs.

Claims (23)

An outer surface portion having a branch portion having an extended portion extending in at least three directions and having a central portion where the extended portions are gathered, having an edge portion that is overlapped and joined; and
Having first and second reinforcing ribs that partition the hollow cross section of the outer surface portion;
The first and second reinforcing ribs each have an extended portion and a central portion that are opposed to the extended portion and the central portion of the branch portion, respectively.
The opposing inner surfaces of the expansion part and the central part of the first and second reinforcing ribs are joined to each other,
The lateral surfaces of the expanded portion and the central portion of the first and second reinforcing ribs are respectively joined to the expanded portion of the outer surface portion and the inner surface of the central portion ,
The hydroformed member according to claim 1, wherein the inner surface joint portion at the central portion of the first and second reinforcing ribs defines a closed surface corresponding to the shape of the branch portion . The extended portion of the branch portion are extended in three directions, said closed face, hydroforming member according to claim 1, characterized in that a substantially triangular shape. The extended portion of the branch portion are extended in four directions, said closed face, hydroforming member according to claim 1, characterized in that the substantially rectangular. The central portion of the first and second reinforcing ribs, hydroforming member according to any one of claims 1 to 3, characterized in that the opening located inside the closed surface, each having . The inner surface joint portion in the extended portion of the first and second reinforcing ribs extends substantially in the center of the extended portion and is connected to the inner surface joint portion in the central portion of the first and second reinforcing ribs. The hydraulic forming member according to any one of claims 1 to 4 . The end face of the extended portion of the first and second reinforcing ribs, hydroforming member according to any one of claims 1 to 5, characterized in that each have a non-joined portion. The junction, hydroforming member according to any one of claims 1 to 6, characterized in that a welding.   The said hydraulic forming member is applied to a vehicle body structural member, The hydraulic forming member of Claim 1 characterized by the above-mentioned. 9. The hydraulic forming member according to claim 8 , wherein the vehicle body structural member is a three-pronged connecting portion for connecting a side sill and a center pillar. 9. The hydraulic forming member according to claim 8 , wherein the vehicle body structural member is a four-pronged connecting portion for connecting a side roof rail, a center pillar, and a roof center. First and second outer surface materials having edge portions that are overlapped and joined, and forming the outer surface portion of the hydroformed member; and
The first and second reinforcing members, which are disposed inside the first and second outer surface materials and form first and second reinforcing ribs that partition the hollow cross section of the hydroformed member;
The first and second outer surface materials each include a branch portion having an extended portion extending in at least three directions and a central portion where the extended portions are assembled,
The first and second reinforcing members each have an extended portion and a central portion that are opposed to the extended portion and the central portion of the branch portion, respectively.
The opposing inner surfaces of the expansion portion and the central portion of the first and second reinforcing members are joined to each other,
The outer surface of the first and second reinforcing members and the outer surface of the central portion are joined to the inner surface of the first and second outer surface members of the outer surface portion and the central portion, respectively .
The preform according to claim 1, wherein the inner surface joint portion at the central portion of the first and second reinforcing members defines a closed surface corresponding to the shape of the branch portion . The preformed body according to claim 11 , wherein the extended portion of the branching portion extends in three directions, and the closed surface has a substantially triangular shape. 12. The preform according to claim 11 , wherein the extended portion of the branch portion extends in four directions, and the closed surface has a substantially rectangular shape. The preformed body according to any one of claims 11 to 13 , wherein a central portion of each of the first and second reinforcing members has an opening located inside the closed surface. The inner surface joint portion in the extended portion of the first and second reinforcing members extends substantially at the center of the extended portion and is connected to the inner surface joint portion in the central portion of the first and second reinforcing materials. The preform according to any one of claims 11 to 14 . The outer surface joint portions of the first and second reinforcing members extend along the lateral sides of the extension portion and the central portion of the first and second reinforcement members, respectively, and the end surfaces of the extension portions are non-joint portions. The preform according to any one of claims 11 to 15 , characterized by comprising: The preform according to any one of claims 11 to 16 , wherein the joining is welding. The one is the extension portion of the first and second outer members, preform according to any one of claims 11 to 17, characterized in that it has an opening for injecting a forming medium. First and second outer materials having edges joined in superposition, and
Having first and second reinforcing members disposed inside the first and second outer surface materials;
The first and second outer surface materials each include a branch portion having an extended portion extending in at least three directions and a central portion where the extended portions are assembled,
The first and second reinforcing members each have an extended portion and a central portion that are opposed to the extended portion and the central portion of the branch portion, respectively.
The opposing inner surfaces of the expansion portion and the central portion of the first and second reinforcing members are joined to each other,
The outer surface of the first and second reinforcing members and the outer surface of the central portion are respectively inside the preforms that are joined to the inner and outer surfaces of the first and second outer surface members of the outer surface portion, respectively.
Apply hydraulic pressure, bulge and deform,
The first and second outer surface materials form an outer surface portion of a hydroformed member having a branch portion having an expansion portion and a central portion where the expansion portions gather,
In the hydraulic forming method for forming the first and second reinforcing ribs that partition the hollow section of the hydraulic forming member by the first and second reinforcing members, respectively ,
The inner surface joint portion at the central portion of the first and second reinforcing members defines a closed surface corresponding to the shape of the branch portion, and applies a hydraulic pressure to the inside of the preform to bulge out When deforming, the inner surface joining portion suppresses a material surplus of the first and second reinforcing materials, and a hydroforming method, characterized in that: 20. The hydraulic forming method according to claim 19 , wherein the forming medium is injected through an opening formed in one of the expanded portions of the first and second outer surface materials. 21. The hydraulic forming method according to claim 19 , wherein the hydraulic forming member is applied to a vehicle body structural member. The hydraulic forming method according to claim 21 , wherein the vehicle body structural member is a three-pronged connecting portion for connecting a side sill and a center pillar. The hydraulic forming method according to claim 21 , wherein the vehicle body structural member is a four-pronged connecting portion for connecting a side roof rail, a center pillar, and a roof center.

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