JP2006095569A - Preform for hydraulic forming, hydraulic forming method and hydraulically formed article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a preform for hydraulic forming in which the breaking of reinforcing materials is suppressed. <P>SOLUTION: The preform 50 includes: a first and a second outside materials 10, 20 which have edge parts 52 overlapped and joined each other and are to form the outer surface of a hydraulically formed article; and reinforcing materials 30, 40 which are joined to the first and the second outside materials and are to form reinforcing ribs for partitioning the hollow cross section of the outer surface. The reinforcing materials 20, 30 have such a dimension that elongation by tension in the tensile direction generated at hydraulic forming is suppressed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a preform for hydraulic molding, a hydraulic molding method, and a hydraulic molded product.

Conventional vehicle body structural members of automobiles such as side members have a hollow structure to improve shock absorption and are provided with reinforcing ribs inside to supplement the strength. The hydraulic molded product is obtained by supplying hydraulic pressure to the inside of a preformed body having two outer surface materials and a reinforcing material, and bulging and deforming (see, for example, Patent Documents 1 and 2).
JP 2003-320960 A JP 2004-82142 A

  However, the deformation of the reinforcing material is not accompanied by the material inflow unlike the case of the outer surface material, and the reinforcing material is linearly extended to form the reinforcing rib, and the reinforcing material is relatively easily broken. Therefore, there is a problem that it is difficult to reliably form the reinforcing ribs and to maintain the strength quality of the hydroformed product stably and satisfactorily.

  The present invention has been made to solve the problems associated with the above-described prior art, and is a preformed body for hydraulic molding capable of suppressing breakage of a reinforcing material, and a hydraulic molded article having stable and good strength quality. It is an object of the present invention to provide a liquid pressure molding method for obtaining a liquid pressure molded product having a stable and good strength quality.

In order to achieve the above object, the invention described in claim 1
First and second outer surface materials that have edge portions that are overlapped and bonded, and that form the outer surface of a hydroformed product, and a hollow cross section of the outer surface that is bonded to the first and second outer surface materials A reinforcing material that will form reinforcing ribs that partition,
The reinforcing material is a preform having a size capable of suppressing elongation due to tension in a tensile direction generated during hydraulic forming.

In order to achieve the above object, the invention according to claim 7 provides:
The preform according to any one of claims 1 to 6 is disposed inside a molding die having a cavity corresponding to an outer surface shape of a hydroformed product,
Reinforcement that partitions the hollow cross section of the hydroformed product while suppressing the elongation of the reinforcing material due to the tension in the pulling direction when applying a hydraulic pressure to the inside of the preform and causing the preform to bulge and deform. This is a hydraulic forming method characterized by forming a rib.

In order to achieve the above object, the invention according to claim 10 provides:
A hydraulic molded product molded using the hydraulic molding method according to any one of claims 7 to 9,
Reinforcing ribs that partition the hollow cross section of the outer surface of the hydroformed product are formed by suppressing the expansion of the reinforcing material due to tension in the tensile direction that occurs during hydroforming. It is.

  The present invention configured as described above has the following effects.

  According to the first aspect of the present invention, since the reinforcing material has a dimension capable of suppressing the elongation due to the tension in the tensile direction generated during the hydraulic forming, it is possible to suppress the breakage of the reinforcing material. . Therefore, it is possible to provide a preform for hydraulic molding that can suppress breakage of the reinforcing material.

  According to the seventh aspect of the present invention, since the reinforcing ribs that partition the hollow section of the hydroformed product are formed while the elongation due to the tension in the tensile direction acting on the reinforcing material is suppressed, the breakage of the reinforcing material is suppressed. Is done. Therefore, it is possible to reliably form the reinforcing ribs from the reinforcing material and to maintain the strength quality of the hydroformed product stably and satisfactorily. Therefore, it is possible to provide a hydroforming method for obtaining a hydroformed product having stable and good strength quality.

  According to the invention described in claim 10, the reinforcing rib that partitions the hollow cross section of the outer surface of the hydroformed product is formed by suppressing elongation due to tension in the tensile direction that occurs during hydroforming, The breakage of the material is suppressed. Therefore, the reinforcing rib is reliably formed, and the strength quality of the hydroformed product is stably and satisfactorily maintained. Accordingly, it is possible to provide a hydroformed product having a stable and good strength quality.

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

  FIG. 1 is a perspective view for explaining a hydraulic molded product according to Embodiment 1, and FIG. 2 is a plan view for explaining an automobile part to which the hydraulic molded product shown in FIG. 1 is applied. .

  The hydroformed product 60 has outer surfaces 61 and 62 and reinforcing ribs 63 and 64 that form a hollow structure, and is an automobile part that requires weight reduction and high rigidity, for example, a side member or a cross of a suspension part 65. Applies to members. However, the hydroformed product 60 can also be applied to a pillar part, an ASKUL part, or a body side part.

  The outer surfaces 61 and 62 have side wall portions 61A and 62A that are inclined with respect to the overlapping surface OS, and top portions 61B and 62B surrounded by the side wall portions 61A and 62A. The reinforcing ribs 63 and 64 partition the hollow sections of the outer surfaces 61 and 62 and support the side wall portions 61A and 62A, and improve the rigidity in the horizontal direction (lateral direction) to the overlapping surface OS. In addition, the reinforcing ribs 63 and 64 are formed by suppressing the elongation due to the tension in the tensile direction that occurs during the hydraulic forming, and have a bent shape.

  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 and 6 are cross-sectional views taken along line VI-VI in FIG.

  The preform 50 has an outer surface material and a reinforcing material. The outer surface material is a member that forms the outer surfaces 61 and 62 of the hydroformed product 60. The reinforcing material is a member that forms the reinforcing ribs 63 and 64 of the hydroformed product 60.

  A plate material constituting the outer surface material is composed of an upper plate (first outer surface material) 10 and a lower plate (second outer surface material) 20, and the overlapped edge portion has a joint portion 52 formed by fillet welding. . The method of forming the joint portion 52 is not particularly limited as long as hermeticity is ensured and does not adversely affect the hydroformability. For example, laser welding, arc welding, or an adhesive can be applied. is there.

  The plate material constituting the reinforcing material is composed of an upper middle plate (first reinforcing material) 30 and a lower middle plate (second reinforcing material) 40 having substantially the same shape, and is arranged so as to overlap the inside of the upper plate 10 and the lower plate 20. Is done. Although the raw material of the board | plate material which comprises the outer surface materials 10 and 20 and the reinforcing materials 30 and 40 is not specifically limited, For example, it is possible to apply a cold rolled steel plate or a hot rolled mild steel plate.

  The upper plate 10 that will form the outer surface 61 of the hydroformed product 60 has an intermediate portion 15 and end portions 11 and 16 positioned with the intermediate portion 15 in between. The outer peripheral part 15A and the central part 15B of the intermediate part 15 form the side wall part 61A and the top part 61B in the outer surface 61. One end portion 11 is formed with a dome-shaped portion 12.

  The lower plate 20 that forms the outer surface 62 of the hydroformed product 60 has a size slightly larger than that of the upper plate 10, is similar to the upper plate 10, and faces the intermediate portion 15 of the upper plate 10. The intermediate portion 25 has end portions 21 and 26 opposite to the end portions 11 and 16 of the upper plate 10. The outer peripheral portion 25A and the central portion 25B of the intermediate portion 25 form a side wall portion 62A and a top portion 62B in the outer surface 62. The end 21 has an opening 22 that is aligned with the dome 12.

  The upper middle plate 30 and the lower middle plate 40 have substantially the same shape. Both end portions 41 of the lower middle plate 40 are connected to the lower plate 20 via a joint portion 54. Both end portions 31 of the upper middle plate 30 are connected to the upper plate 10 via a joint portion 56. The central portion 42 of the lower intermediate plate 40 is connected to the central portion 32 of the upper intermediate plate 30 via a joint portion 55.

  Both end portions 31, 41 of the upper intermediate plate 30 and the lower intermediate plate 40 are intermediate portions 15 of the upper plate 10 and the lower plate 20 that form the side wall portions 61 A, 62 A on the outer surfaces 61, 62 of the hydroformed product 60. , 25 are joined to the outer peripheral portions 15A, 25A. Therefore, the hydraulic molded product obtained from the preform 50 has the reinforcing ribs 63 and 64 that support the side wall portions 61A and 62A, thereby improving the rigidity in the direction parallel to the overlapping surface OS (lateral direction). It is possible.

  Further, the length between the joint portion 55 in the central portions 32 and 42 and the joint portions 54 and 56 in the both end portions 31 and 41 is set to be larger than the linear distance between the corresponding joint portions in the hydroformed product 60. And the slack which the reinforcement ribs 63 and 64 can bend is provided. Therefore, the upper intermediate plate 30 and the lower intermediate plate 40 are not subjected to tension in the tensile direction generated during the hydraulic forming. That is, since the upper intermediate plate 30 and the lower intermediate plate 40 have dimensions that can suppress elongation due to tension in the tensile direction that occurs during hydraulic forming, the upper intermediate plate 30 and the lower intermediate plate 40 are prevented from breaking. It is possible.

  The joint portions 54, 55, and 56 are formed by through welding. Through-welding is preferable because the first sheet material located on the surface and the second sheet material located on the inner side are fusion-bonded to each other, and a good bonding strength is obtained. Laser welding or electron beam welding can be applied to the penetration welding. Further, the method of forming the joint portions 54, 55, and 56 is not particularly limited as long as the joint strength is ensured and the hydroformability is not adversely affected. For example, an adhesive can be applied.

  Next, an example of a method for joining the reinforcing members (lower middle plate and upper middle plate) of the preform is described. 7 is a sectional view for explaining the joining of the lower middle plate to the lower plate, FIG. 8 is a sectional view for explaining the joining of the upper middle plate to the lower middle plate, following FIG. 7, and FIG. FIG. 9 is a cross-sectional view for explaining the joining of the upper plate to the upper middle plate following FIG. 8.

  First, the lower middle plate 40 is arranged with respect to the lower plate 20 arranged at a predetermined position. Then, both end portions 41 of the lower intermediate plate 40 are joined to the outer peripheral portion 25A of the intermediate portion 25 of the lower plate 20 by through welding to form a joined portion 54 (see FIG. 7).

  Thereafter, the upper intermediate plate 30 is placed so as to overlap the lower intermediate plate 40, and the central portion 32 of the upper intermediate plate 30 is joined to the central portion 42 of the lower intermediate plate 40 by through welding. (See FIG. 8).

  And the upper board 10 is mounted and the edge of the upper board 10 and the edge of the lower board 20 are piled up. And 15 A of outer peripheral parts of the intermediate part 15 of the upper board 10 are joined to both the edge parts 31 of the upper middle board 30 by penetration welding, and the junction part 56 is formed (refer FIG. 9).

  Finally, the overlapped edges of the upper plate 10 and the lower plate 20 are joined to obtain the preform 50 (see FIG. 6).

  10 is a cross-sectional view for explaining the hydraulic forming apparatus according to the first embodiment, FIG. 11 is a plan view for explaining the upper mold of the hydraulic forming apparatus shown in FIG. 10, 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 has a molding die (upper mold 70 and lower mold 80) and a hydraulic pressure supply means 90. The upper mold 70 and the lower mold 80 are installed so as to be close to and away from each other, and the preformed body 50 is arranged on the inner side and the mold is clamped.

  The upper mold 70 and the lower mold 80 have cavity surfaces 71 and 81 and pressing portions 75 and 85. The cavity surfaces 71 and 81 correspond to the outer shape of the hydroformed product 60, and the side walls and top surfaces corresponding to the side wall portions 61 </ b> A and 62 </ b> A and the top portions 61 </ b> B and 62 </ b> B on the outer surfaces 61 and 62 of the hydroformed product 60. Top or bottom). The pressing portions 75 and 85 are portions that grip the outer periphery of the preform 50 by clamping.

  The pressing portion 75 of the upper mold 70 includes a concave portion 76 extending from the cavity surface 71 and arc-shaped grooves 77 and 78 disposed so as to surround the front end portion 76 </ b> A of the concave portion 76. The distal end portion 76A has a cross-sectional shape corresponding to the outer shape of a portion obtained by dividing the dome-shaped portion 12 of the preform 50 into two in the vertical direction. The center of the arc-shaped grooves 77 and 78 is the center of the distal end portion 76A. The pressing portion 85 of the lower mold 80 has a substantially rectangular recess 86 in which the nozzle portion 91 is disposed.

  The hydroforming apparatus further includes a large spacer and a small spacer (not shown) disposed between the pressing portion 75 of the upper mold 70 and the pressing portion 85 of the lower mold 80. The lower mold 80 is configured to be clamped in two stages.

  The thickness of the large spacer is equal to the thickness of the part of the preform 50 where the joint portions 54, 55, 56 are disposed (the total thickness of the upper plate 10 and the lower plate 20, the upper middle plate 30 and the lower middle plate 40). Set accordingly. The thickness of the small spacer is set corresponding to the thickness of the edge of the preform 50 (the total thickness of the upper plate 10 and the lower plate 20) where the joint 52 is disposed.

  The hydraulic pressure supply means 90 is connected to, for example, a pressure generating device using a pressure increasing cylinder and a forming medium source, and includes a flow path 98 and a nozzle portion 91 connected to a hydraulic pressure circuit 99. The flow path 98 extends inside the lower mold 80 and reaches the nozzle portion 91. The forming medium is, for example, water.

  The nozzle portion 91 has a dome-shaped portion 92 corresponding to the inner surface of the dome-shaped portion 12 of the preformed body 50, and annular convex portions 94, 95 disposed so as to surround the dome-shaped portion 92. The annular convex portions 94 and 95 are aligned with the arc-shaped grooves 77 and 78 of the pressing portion 75 of the upper mold 70. The size of the annular convex portions 94 and 95 is smaller than the size of the arc-shaped grooves 77 and 78 and is set in consideration of the thickness of the upper plates 10 and 20. The arc-shaped grooves 77 and 78 and the annular convex portions 94 and 95 can be omitted as appropriate.

  The dome 92 is freely inserted into the opening 22 of the lower plate 20, and has an inlet 93 communicating with the flow path 98. When the nozzle portion 91 is inserted into the opening portion 22 and disposed in the dome-shaped portion 12 of the preformed body 50, the forming medium supplied from the hydraulic circuit 99 passes through the nozzle portion 91 and the opening portion 22 and is spared. It is introduced into the molded body 50. Therefore, the forming medium can apply a hydraulic pressure to the inside of the preform 50 to bulge and deform the preform 50.

  Next, the hydraulic forming method according to Embodiment 1 will be described. 13 is a cross-sectional view for explaining mold clamping, FIG. 14 is a cross-sectional view taken along line XIV-XIV in FIG. 13, and FIG. 15 is a cross-sectional view for explaining the initial stage of molding following FIG. FIG. 17 is a cross-sectional view for explaining mold clamping following FIG. 15, FIG. 17 is a cross-sectional view for explaining the middle stage of molding following FIG. 16, and FIG. 18 is for explaining the latter half of molding subsequent to FIG. FIG. 19 is a cross-sectional view for explaining the deformation of the reinforcing rib due to the variation of the operating conditions.

  First, the preform 50 is placed on the lower mold 80. At this time, the lower plate 20 that will form the outer surface 62 of the hydroformed product 60 is disposed so as to face the cavity surface 81, and the opening 22 of the lower plate 20 is disposed at the nozzle portion of the hydraulic pressure supply means 90. The dome-shaped portion 92 of 91 is positioned.

  Thereafter, the upper die 70 that has been retracted to the standby position is lowered and approaches the lower die 80, whereby the upper die 70 and the lower die 80 are clamped (see FIGS. 13 and 14). At this time, the upper plate 10 that forms the outer surface 61 of the hydroformed product 60 is disposed so as to face the cavity surface 71, and the dome-shaped portion 12 of the upper plate 10 is placed on the pressing portion 75 of the upper mold 70. It is made to fit in the front-end | tip part 76A of the recessed part 76 located in this.

  The vicinity of the dome-shaped portion 12 is gripped by the arc-shaped grooves 77 and 78 in the pressing portion 75 of the upper die 70 and the annular convex portions 94 and 95 in the nozzle portion 91 disposed in the concave portion 86 of the lower die 80. . As a result, a bent portion is formed in an annular shape in the vicinity of the dome-shaped portion 12, and the sealing performance for the introduced forming medium is improved.

  The joint portions 52, 54, and 56 of the preform 50 are disposed on the pressing portions 75 and 85 that have a predetermined clearance secured by a large spacer (not shown).

  The hydraulic pressure supply means 90 introduces the molding medium supplied from the hydraulic circuit 99 into the preformed body 50 via the nozzle portion 91 and the opening 22 and applies the hydraulic pressure. As a result, the preform 50 is bulged and deformed, the edge of the preform 50 moves toward the cavity surfaces 71 and 81, and material inflow is caused.

  When the joint portions 54 and 56 of the preform 50 are moved into the internal molding space of the cavity surfaces 71 and 81 (see FIG. 15), the large-sized members disposed between the pressing portions 75 and 85 of the upper mold 70 and the lower mold 80 are used. A spacer (not shown) is replaced with a small spacer. The upper mold 70 is lowered so as to correspond to the thickness of the small spacer and is clamped to ensure a predetermined clearance corresponding to the thickness of the edge of the preform 50 (see FIG. 16).

  As the forming medium continues to be supplied, the upper middle plate 30 and the lower middle plate 40 joined to the upper plate 10 and the lower plate 20 are further deformed (see FIG. 17). At this time, between the joint portion 55 in the central portions 32 and 42 and the joint portions 54 and 56 in the both end portions 31 and 41 have a sufficient size to maintain the slack, the tension in the tensile direction does not act, It becomes a bent shape.

  That is, the reinforcing ribs that partition the hollow cross section of the hydroformed product are formed while the elongation due to the tension in the tensile direction acting on the upper middle plate 30 and the lower middle plate 40 is suppressed. Therefore, breakage of the upper intermediate plate 30 and the lower intermediate plate 40 is suppressed, reinforcing ribs can be reliably formed, and the strength quality of the hydroformed product can be maintained stably and satisfactorily.

  Further, the base portions of the upper intermediate plate 30 and the lower intermediate plate 40 are bent in an L shape due to the presence of the joint portions 54 and 56, and the curvature radius of the bent portion is reduced.

  When the inside of the preform 50 reaches the final hydraulic pressure, the supply of the forming medium is stopped and held for a predetermined time, whereby the bulge of the preform 50 is completed (see FIG. 18). Thereby, the upper plate 10 and the lower plate 20 form the outer surfaces 61 and 62 of the hydroformed product 60, and the outer peripheral portions 15A and 25A and the central portion 15B of the intermediate portions 15 and 25 of the upper plate 10 and the lower plate 20 are formed. 25B forms side wall portions 61A and 62A that are inclined with respect to the overlapping surface OS on the outer surfaces 61 and 62, and top portions 61B and 62B that are surrounded by the side wall portions 61A and 62A.

  On the other hand, both end portions 31 and 41 of the upper intermediate plate 30 and the lower intermediate plate 40 are joined to the side wall portions 61A and 62A, and the central portions 32 and 42 are joined to each other. The plate 40 forms reinforcing ribs 63 and 64 that partition the hollow sections of the outer surfaces 61 and 62 of the hydroformed product 60 and support the side surfaces 61A and 62A of the outer surfaces 61 and 62 while bending them.

  Note that the joint 55 that connects the central portions 32 and 42 of the upper intermediate plate 30 and the lower intermediate plate 40 may be decentered from the central position (initial position) depending on the influence of variation due to fluctuations in the operating conditions. (See FIG. 19). However, since the length between the joints in the upper intermediate plate 30 and the lower intermediate plate 40 is set so as to maintain sufficient slack, the upper intermediate plate 63 (one of the reinforcing members) has a tension in the tensile direction. Is suppressed from acting excessively.

  Then, after the pressure is released, the upper mold 70 is raised and the mold is opened, and the hydroformed product is taken out and trimming such as cutting is performed.

  The reinforcing ribs 63 and 64 of the hydroformed product 60 are formed by suppressing the elongation due to the tension in the tensile direction that occurs during the hydroforming, and the breakage of the upper intermediate plate 30 and the lower intermediate plate 40 is suppressed. Has been. Therefore, the reinforcing ribs 63 and 64 are reliably formed, and the strength quality of the hydroformed product is stably and satisfactorily maintained.

  As described above, Embodiment 1 includes a hydroforming preform that can suppress breakage of the reinforcing material, a hydroforming method for obtaining a hydroformed product having stable and good strength quality, and It is possible to provide a hydroformed product having a stable and good strength quality.

  In the first embodiment, the hydraulic pressure is applied by injecting the molding medium into the opening formed in one of the outer surface materials. It is possible to apply types of preforms and hydraulic forming devices.

  For example, a plurality of the openings 22 of the lower plate 20 and the nozzles 91 of the hydraulic pressure supply means 90 can be provided. Further, by configuring the joints 54 and 56 of the preform 50 so as to be arranged from the beginning in the internal molding space of the cavity surfaces 71 and 81, the spacer need not be replaced, and the mold clamping is performed once. It is also possible to do.

  20 is a cross-sectional view for explaining the preform according to the second embodiment, and FIG. 21 explains the shapes of the lower intermediate plate and the upper intermediate plate constituting the reinforcing material of the preform shown in FIG. It is sectional drawing for doing. In the following description, members having the same functions as those of the first embodiment are denoted by similar reference numerals, and the description thereof is omitted to avoid duplication.

  The second embodiment is generally different from the first embodiment in that the shapes of the upper and lower intermediate plates are changed to reduce erroneous welding.

  The upper middle plate 130 and the lower middle plate 140 according to the second embodiment have recesses 131 and 141 located at the approximate center between both ends. The recesses 131 and 141 have, for example, a bent shape, and can be formed by press molding.

The recesses 131 and 141 are aligned with the joints 154 and 156 and are welded through. The welding heat due to through welding moves preferentially through the portion where the plate thickness has decreased, and preferably requires a penetration of 2 to 3 times the plate thickness. Therefore, the thickness _{D 2} of the bottom surface of the recess 131 and 141 is smaller than the thickness _{D 1} of the vicinity of the recesses 131 and 141 (sites not recesses 131 and 141 formed), and the width W of the recess 131 and 141 It is set to be two to three times the thickness D _1.

The lower intermediate plate 140 is installed such that the back surface portion 142 of the recess 141 faces the lower plate 120, and the back surface portion 14 is connected to the central portion of the lower plate 120 via the joint portion 154. Since the back surface portion 142 constitutes a protrusion (a protrusion), a thin flat gap S ₂ is formed between the lower middle plate 140 and the lower plate 120.

The upper intermediate plate 130 is installed so that the concave portion 131 faces the concave portion 141 of the lower intermediate plate 140, and both end portions of the upper intermediate plate 130 are connected to both end portions of the lower intermediate plate 140 via joints 155. The The recess 131 of the recess 131 and the lower insertion plate 140 of the upper insertion plate 130, come together to form a clearance _{S 1} of substantially rectangular shape.

The upper plate 110 is installed so as to face the back surface portion 132 of the concave portion 131 of the upper intermediate plate 130, and the central portion of the upper plate 110 is connected to the back surface portion 132 of the concave portion 131 of the upper intermediate plate 130 via the joint portion 156. Connected to Since the back surface portion 132 constitutes a protrusion (having a protrusion shape), a thin and flat gap S ₃ is formed between the upper plate 110 and the upper middle plate 130. The edge portion of the upper plate 110 is connected to the edge portion of the lower plate 120 via the joint portion 152.

  Next, an example of a method for joining the reinforcing members 130 and 140 of the preform 150 will be described. 22 is a cross-sectional view for explaining the joining of the lower middle plate to the lower plate, FIG. 23 is a sectional view for explaining the joining of the upper middle plate to the lower middle plate, following FIG. 22, and FIG. It is sectional drawing for demonstrating joining of the upper board with respect to an upper middle board following FIG.

  First, the lower middle plate 140 is arranged so that the recess 141 faces the lower plate 120 with respect to the lower plate 120 arranged at a predetermined position. Then, both end portions of the lower intermediate plate 140 are joined to the lower plate 120 by through welding to form a joint portion 154 (see FIG. 22).

  Thereafter, the upper intermediate plate 130 is placed on the lower intermediate plate 140, and the back surface portion 132 of the concave portion 131 of the upper intermediate plate 130 is brought into contact with the back surface portion 142 of the concave portion 141 of the lower intermediate plate 140. And the recessed part 131 of the upper middle board 130 is joined to the back surface part 142 of the recessed part 141 of the lower middle board 140 by penetration welding, and the junction part 155 is formed (refer FIG. 23).

  That is, the joining portion 155 is a first sheet located on the surface in a state where three or more sheets (upper middle plate 130 and lower middle plate 140) constituting the outer surface material (lower plate 120) and the reinforcing material are stacked. It is formed by welding the plate material (upper middle plate 130) to the second plate material (lower middle plate 140) located inside thereof.

Recess 141 of the lower insertion plate 140 to form a gap _{S 2.} That is, during welding, a gap S ₂ aligned with the joint surface is formed between the second plate member (lower middle plate 140) and the third plate member (lower plate 120) located inside thereof. Has been placed. Therefore, the gap S ₂ prevents the welding heat from being transferred and prevents erroneous welding between the second plate member (lower middle plate 140) and the third plate member (lower plate 120). , And the welding yield is improved.

The upper middle plate 130 is only supported by the rear portion 142 of the concave portion 141 of the lower middle plate 140 via the rear portion 132 of the concave portion 131, and is relatively unstable. Therefore, the clearance _{S 3} which is formed between the upper insertion plate 130 and the lower insertion plate 140, by disposing the bite Shi plate 158 and 159, to eliminate the unstable state. Further, the gap S ₃ has a function of absorbing the warp that occurs at the surfaces and the lower plate 120 and the lower insertion plate 140, to suppress the breakage of the joint portion by welding defects, also the welding yield Improve.

  When the formation of the joint portion 155 is completed, the biting plates 158 and 159 are removed, the upper plate 110 is placed, and the edge portion of the upper plate 110 and the edge portion of the lower plate 120 are overlapped. Then, the upper plate 110 is joined to both ends of the upper middle plate 130 by through welding to form a joined portion 156 (see FIG. 24).

At this time, there is a gap S ₃ between the upper middle plate 130 and the lower middle plate 140. That is, the joint portion 156 is located on the surface in a state in which three or more plate members (upper middle plate 130 and lower middle plate 140) constituting the outer surface materials (upper plate 110 and lower plate 120) and the reinforcing material are stacked. The first plate member (upper plate 110) is welded to the second plate member (upper middle plate 130) located inside thereof. Then, a second sheet of sheet material (upper insertion plate 130), between the third sheet of sheet material located on the inner side (the lower insertion plate 140), the clearance S ₃ which is combined position and the joint surface is disposed .

Therefore, the clearance S ₃ interferes with the transmission of welding heat, two plates for preventing erroneous welding of the (upper insertion plate 130) and the third sheet of sheet material (lower insertion plate 140), portions bonded by welding defects , And the welding yield is improved.

  When the formation of the joint portion 156 is completed, the overlapped edge portions of the upper plate 110 and the lower plate 120 are joined to obtain the preform 150 (see FIG. 20).

As described above, erroneous welding is suppressed in the preformed body 150 according to the second embodiment. Therefore, the quality of the welded joint is improved, and it is possible to suppress breakage at the welded joint. Moreover, since the welding yield is improved, the manufacturing cost of the preform can be reduced. Incidentally, bite Shi plate 158, 159 disposed in a gap _{S 3} is optionally, it is also possible to appropriately omitted.

  FIG. 25 is a cross-sectional view for explaining the preform according to the third embodiment.

  The preformed body 250 according to the third embodiment is generally different from the preformed body 150 according to the second embodiment in that the shapes of the upper and lower intermediate plates are not the same, and the upper intermediate plate 230 is substantially the same. The lower middle plate 240 is flat and has a recess 241 located at the approximate center between both ends.

The lower intermediate plate 240 is installed so that the concave portion 241 faces the lower plate 220, and both end portions of the lower intermediate plate 240 are connected to the lower plate 220 via joint portions 254. A gap S ₂ is formed between the plate 220 and the plate 220.

The upper intermediate plate 30 is connected to the back surface portion 242 of the concave portion 241 of the lower intermediate plate 240 via the joint portion 255. Reference numeral 232 denotes a back surface portion of the upper intermediate plate 230 that contacts the back surface portion 242 of the concave portion 241 of the lower intermediate plate 240, and the contact surface between the back surface portion 232 and the back surface portion 242 defines a bonding surface. Since the back surface portion 242 has a protruding shape, a gap S <b> ₃ is formed between the upper middle plate 230 and the lower middle plate 240.

  As described above, the concave portion 241 is formed only in the lower middle plate 240, and the shape in the vicinity of the joint portion 255 is not vertically symmetrical. On the other hand, in the initial stage of hydraulic forming, the upper intermediate plate 230 and the lower intermediate plate 240 are subjected to a bending state by compression load (see FIG. 15).

  At this time, since the side where the concave portion 241 is arranged in the joint portion 255 is easily bent, unlike the preformed body 250 according to the second embodiment, the initial bending direction is constant, and the position of the joint portion 255 is set at a substantially central position. It is possible to keep it reliably. That is, it is possible to avoid the reinforcing rib from having a distorted shape due to the difference in the amount of swelling in the hydraulic forming.

  As described above, in Embodiment 3, it is possible to improve the shape quality (accuracy) of the reinforcing rib that partitions the hollow cross section of the molded product as compared with Embodiment 2.

  FIG. 26 is a cross-sectional view for explaining a lower middle plate and an upper middle plate constituting the reinforcing material according to the fourth embodiment. The preform according to the fourth embodiment is generally different from the preform 150 according to the second embodiment in that protrusions are formed on the upper intermediate plate and the lower intermediate plate.

  The protrusions 334 and 344 according to the fourth embodiment are arranged with the back surface portions 332 and 342 of the recesses 331 and 341 interposed therebetween, and are located in the vicinity of the end portions. The protrusions 334 and 344 have a bent shape having a substantially flat top, and can be formed by press molding, for example. Reference numerals 335 and 345 indicate recessed back portions of the protrusions 334 and 344.

  The protrusions 334 and 344 are positioned so as to be in contact with each other, and the heights of the protrusions 334 and 344 coincide with the heights of the rear portions 332 and 342 of the recesses 331 and 341.

Therefore, when the back surface portion 332 of the upper intermediate plate 330 and the back surface portion 342 of the lower intermediate plate 340 are made to face each other and the upper intermediate plate 330 is overlapped with the lower intermediate plate 340, the protrusions 334 and the concave portions 331 of the upper intermediate plate 330 are overlapped. , 341 are in contact with the protrusions 344 of the lower intermediate plate 340 and the back portions 342 of the recesses 341, respectively. In addition, the gap S ₃ formed between the upper middle plate 330 and the lower middle plate 340 coincides with the total height of the back surface portions 332 and 342.

  Next, an example of the joining method of the reinforcing material shown in FIG. 26 will be described. 27 is a sectional view for explaining the joining of the upper middle plate to the lower middle plate, FIG. 28 is a sectional view for explaining the joining of the lower middle plate to the lower plate, following FIG. 27, and FIG. 28 is a cross-sectional view for explaining the joining of the upper plate to the upper middle plate, and FIG. 30 is a cross-sectional view for explaining the joining of the upper plate to the lower plate, following FIG.

  First, the upper intermediate plate 330 is overlapped with the lower intermediate plate 340 disposed at a predetermined position, and the protrusions 334 of the upper intermediate plate 330 and the rear portions 332 and 342 of the recesses 331 and 341 and the lower intermediate plate 340 are arranged. The protrusion 344 and the back surface portion 342 of the recess 341 are brought into contact with each other. And the recessed part 331 of the upper middle board 330 is joined to the back surface part 342 of the recessed part 341 of the lower middle board 340 by penetration welding, and the junction part 355 is formed (refer FIG. 27).

  Unlike the case of the second embodiment where the upper intermediate plate 330 is supported at one location, the protrusion 344 of the lower intermediate plate 340 and the rear portion 342 of the concave portion 341 (via the rear portion 332 of the concave portion 331). It is stable because it is supported by a total of three locations. Therefore, it is not necessary to apply the biting plates 158 and 159 for eliminating the unstable state, the number of steps related to the biting plates 158 and 159 can be reduced, and the productivity is excellent.

  Thereafter, the joined body of the upper intermediate plate 330 and the lower intermediate plate 340 is disposed so that the concave portion 341 of the lower intermediate plate 340 faces the lower plate 320. Then, the lower plate 320 is joined to both ends of the lower middle plate 340 by through welding to form a joined portion 354 (see FIG. 28). The welding position is in the vicinity of the protrusion 344 (back surface portion 345).

  That is, the joint portion 354 is a first sheet located on the surface in a state in which three or more sheets (upper middle plate 330 and lower middle plate 340) constituting the outer surface material (lower plate 320) and the reinforcing material are stacked. It is formed by welding the plate material (lower plate 320) to the second plate material (lower middle plate 340) located inside thereof.

On the other hand, between the upper insertion plate 330 and the lower insertion plate 340, a gap _{S 3} formed by the abutment of the rear portion 332, 342 of the protrusions 334,344 and recesses 331 and 341 are present. Therefore, the clearance S ₃ interferes with the transmission of welding heat, prevent erroneous welding of the second sheet of sheet material 3 sheet of plate material (the lower insertion plate 340) (upper insertion plate 330).

When the formation of the joint portion 354 is completed, the upper plate 310 is placed, and the edge portion of the upper plate 310 and the edge portion of the lower plate 320 are overlapped. Then, the upper plate 310 is joined to both ends of the upper middle plate 330 by through welding to form a joined portion 356 (see FIG. 29). Welding position is in the vicinity of the projecting portion 334 (rear portion 335) between the upper insertion plate 330 and the lower insertion plate 340, and there is a gap _{S 3.}

That is, the joint portion 356 is located on the surface in a state in which three or more sheets of outer surface materials (upper plate 310 and lower plate 320) and reinforcing members (upper middle plate 330 and lower middle plate 340) are stacked. The first plate member (upper plate 310) is welded to the second plate member (upper middle plate 330) located inside thereof. Then, the second sheet plate members (upper insertion plate 330), between the third sheet of sheet material located on the inner side (the lower insertion plate 340), the clearance S ₃ which is combined position and the joining surfaces are arranged .

Therefore, the clearance S ₃ interferes with the transmission of welding heat, prevent erroneous welding of the second sheet of sheet material (upper insertion plate 330) and the third sheet of plate material (the lower insertion plate 340).

  When the formation of the joining portion 356 is completed, the overlapped edge portions of the upper plate 310 and the lower plate 320 are joined to obtain the preform 350 (see FIG. 30). Note that reference numeral 352 indicates a joint 352 formed at the edge.

  As described above, in the fourth embodiment, productivity can be improved as compared with the second and third embodiments.

  Note that the heights of the protrusions 334 and 344 are not limited to being the same. For example, if the total height of the protrusions 334 and 344 matches the total of the rear portions 332 and 342 of the recesses 331 and 341, the heights of the protrusions 334 and 344 can be appropriately varied. It is. Further, it is possible to form a protrusion on only one of the upper middle plate 330 and the lower middle plate 340. In this case, the height of the protrusions matches the sum of the back surface portions 332 and 342 of the recesses 331 and 341.

  FIG. 31 is a cross-sectional view for explaining the reinforcing material according to the fifth embodiment.

  The preform 450 according to the fifth embodiment is generally different from the preform 350 according to the fourth embodiment with respect to the shape of the upper intermediate plate. In the fifth embodiment, the upper intermediate plate 430 is substantially flat. The lower middle plate 440 has a recess 441 and a projection 444.

  Since the upper middle plate 430 is supported by the back surface portion 442 of the concave portion 441 of the lower middle plate 440 and the protrusions 444 (three places in total), the upper middle plate 430 is stable. Therefore, as in the case of the fourth embodiment, the number of man-hours can be reduced, and the productivity is excellent.

Further, a gap S <b> ₃ is formed between the upper intermediate plate 430 and the lower intermediate plate 440 by contact between the upper intermediate plate 430, the back surface portion 442 of the concave portion 441, and the protruding portion 444. Therefore, when the joined body of the upper middle plate 430 and the lower middle plate 440 in which the joint portion 455 is formed is disposed on the lower plate 420, the joint portion 454 is formed in the vicinity of the protruding portion 444 (back surface portion 445). , the clearance S _3, as in the case of the fourth embodiment, interfere with the transmission of welding heat, prevent erroneous welding of the lower insertion plate 440 and the upper insertion plate 430.

Further, after the formation of the joint 454 is completed, the upper plate 410, disposed upper insertion plate 430, in the vicinity of the site 434 and the projection 444 abuts, when forming the joint 456, the gap _{S 3} is As in the case of the fourth embodiment, the transmission of welding heat is hindered, and erroneous welding between the upper intermediate plate 430 and the lower intermediate plate 440 is prevented.

  On the other hand, in the preform 450, the concave portion 441 is formed only in the lower middle plate 440, and the shape in the vicinity of the joint portion 455 is not vertically symmetric as in the case of the third embodiment. Therefore, when hydraulic forming is applied, the side where the concave portion 441 is disposed in the joint portion 455 is easily bent, so that the initial bending direction is constant, and the position of the joint portion 455 is reliably maintained at the substantially central position. Is possible. That is, it is possible to avoid the reinforcing rib from having a distorted shape due to the difference in the amount of swelling in the hydraulic forming.

  As described above, in Embodiment 5, the shape quality (accuracy) of the reinforcing rib that partitions the hollow cross section of the molded product can be improved as compared with Embodiment 4.

  The protrusions are not limited to being formed on the lower intermediate plate 440, but can be provided on the upper intermediate plate 430. Further, it is possible to form protrusions on both the lower middle plate 440 and the upper middle plate 430. In this case, it is necessary that the total height of the protrusions be substantially the same as the height of the back surface portion 442 of the recess 441 of the lower intermediate plate 440.

  FIG. 32 is a cross-sectional view for explaining the upper intermediate plate constituting the reinforcing material according to the sixth embodiment, and FIG. 33 is a cross-section for explaining the lower intermediate plate constituting the reinforcing material according to the sixth embodiment. 34 and 34 are cross-sectional views for explaining the fitting structure of the upper middle plate in FIG. 32 and the lower middle plate in FIG.

  The preform according to the sixth embodiment is generally different from the preform 350 according to the fourth embodiment (see FIG. 20) with respect to the shapes of the upper intermediate plate and the lower intermediate plate, and the upper according to the sixth embodiment. The intermediate plate 530 has a protrusion 534 that is disposed with the back surface portion 532 of the recess 531 interposed therebetween. The protrusion 534 is substantially V-shaped, and is located near the end of the upper middle plate 530.

  On the other hand, the lower middle plate 540 has a receiving portion 544 disposed with the back surface portion 542 of the concave portion 541 interposed therebetween. The receiving portion 544 is formed of, for example, a protruding portion formed by press molding, and is positioned so as to be fitted to the protruding portion 534 of the upper intermediate plate 530. The receiving part 544 has a top part in which a recessed part 544A that can be fitted to the protrusion part 534 of the upper intermediate plate 530 is formed. Note that reference numeral 545 indicates a recessed rear portion of the receiving portion 544.

Further, the receiving portion 544 of the lower insertion plate 540, a gap S ₃ formed between the lower insertion plate 540 and the upper insertion plate 530 at the time that the fitted protrusion 534 of the upper insertion plate 530, upward in the The sum of the height of the back surface portion 532 of the recess 531 of the plate 530 and the height of the back surface portion 542 of the recess 541 of the lower middle plate 540 coincides.

  When the upper middle plate 530 is overlapped with the lower middle plate 540, the protrusion 534 of the upper middle plate 530 and the receiving portion 544 of the lower middle plate 540 are fitted at a predetermined position. That is, the protrusion 534 and the receiving part 544 function as a positioning mechanism for the upper intermediate plate 530 with respect to the lower intermediate plate 540.

  Therefore, when the concave portion 531 of the upper intermediate plate 530 is joined to the back surface portion 542 of the concave portion 541 of the lower intermediate plate 540 by through welding to form a joined portion (see FIG. 27), the upper intermediate plate with respect to the lower intermediate plate 540 The superposition of 530 can be performed easily and quickly.

  As described above, in the sixth embodiment, productivity can be improved as compared with the fourth embodiment.

  It is also possible to arrange the receiving portion 544 on the upper middle plate 530 and the projection 534 of the lower middle plate 540.

  Further, the positioning mechanism by fitting the protrusion 534 and the receiving portion 544 can be applied to the third embodiment. For example, by arranging the protrusion 534 on the upper intermediate plate 530 and the receiving portion 544 on the lower intermediate plate 540, the upper intermediate plate 530 can be easily and quickly overlapped with the lower intermediate plate 540. .

In this case, the gap S ₃ formed between the lower intermediate plate 540 and the upper intermediate plate 530 when the receiving portion 544 of the lower intermediate plate 540 is fitted to the protrusion 534 of the upper intermediate plate 530 is lower. It is necessary to match the height of the back surface portion 542 of the concave portion 541 of the intermediate plate 540. It is also possible to arrange the receiving portion 544 on the upper middle plate 530 and arrange the protrusion 534 on the lower middle plate 540.

  FIG. 35 is a plan view for explaining the shapes of the lower intermediate plate and the upper intermediate plate constituting the reinforcing material of the preform according to the seventh embodiment, and FIG. 36 shows the preform according to the seventh embodiment. FIG. 37 is a cross-sectional view for explaining, and FIG. 37 is a conceptual diagram for explaining the shape change of the opening shown in FIG.

  The preform according to the seventh embodiment is generally different from the preform 50 according to the first embodiment with respect to the shapes of the upper intermediate plate and the lower intermediate plate, and the upper intermediate plate 630 and the lower intermediate body according to the seventh embodiment. The middle plate 640 is made of, for example, expanded metal (specified in JIS G 3351) and has openings 635 and 645. The openings 635 and 645 are formed, for example, by cutting in a zigzag pattern (cutting) by machining, and the upper middle plate 630 and the lower portion are expanded by expanding when bulging deformation is caused by hydraulic forming. Elongation causing breakage of the intermediate plate 640 is suppressed.

  Openings 635 and 645 are arranged in non-joining parts (parts excluding both ends 631 and 641 and central part 642 of upper middle plate 630 and lower middle plate 640 where joining parts 654, 655 and 656 are arranged). Therefore, the influence on the bonding is suppressed. However, the openings 635 and 645 can be formed over the entire surface as necessary.

  As described above, the preform 650 can expand the openings 635 and 645 included in the reinforcing members 630 and 640 when the preform bulges and deforms by hydraulic molding, and the openings 635 and 645 are expanded. Suppresses the elongation of the reinforcing members 630 and 640 that cause the reinforcing members 630 and 640 to break.

  Therefore, for example, even when the joint portion 655 that connects the central portions 632 and 642 of the reinforcing members 630 and 640 is excessively decentered from the central position due to, for example, the influence of variation due to fluctuations in operating conditions, the reinforcing member Breakage of 630 and 640 can be reliably suppressed. The shape of the openings 635 and 645 is not particularly limited as long as it can be expanded in the case of bulging deformation by hydraulic molding, and for example, a rhombus or a turtle shell can be applied.

  FIG. 38 is a perspective view for explaining an example of a forming apparatus for forming the opening shown in FIG.

  The forming apparatus for forming the opening is, for example, an expanded metal machining apparatus, and includes an upper blade 638 having a corrugated cutting edge and a lower blade 639 having a linear cutting edge. The upper blade 638 is disposed so as to be movable up and down and movable in the length direction, and is positioned above the material plate 639 that constitutes the reinforcing members 630 and 640. The cutting edge waveform of the upper blade 638 corresponds to the long dimension of the openings 635 and 645. The lower blade 639 is fixedly disposed below the material plate 639 and supports the lower portion of the material plate 639.

  In forming the opening, first, the upper blade 638 is moved down by a predetermined stroke while the material plate 639 is fed by the strand width SW of the openings 635 and 645 by a pinch roller, for example, and linked with the lower blade 638. The material plate 639 is cut and pushed, and then rises. The upper blade 638 moves in the length direction by a half pitch of the blade edge waveform at the ascending position, and lowers again to cut and push the blank plate 639.

  In this way, an opening is formed by intermittently feeding the material plate 639 and repeating the vertical movement of the upper blade 638 and the reciprocating movement in the length direction. In addition, since the opening parts 635 and 645 have a protuberance, when they are overlapped, a relatively large installation space is required, and the preform is enlarged. Therefore, it is preferable to perform flat processing by rolling, for example.

  FIG. 39 and FIG. 40 are plan views for explaining Modification 1 and Modification 2 according to Embodiment 7, and FIG. 41 is a conceptual diagram for explaining Modification 3 according to Embodiment 7, and FIG. 42 is a cross-sectional view for explaining a fourth modification according to the seventh embodiment.

  It is preferable that the openings 635 and 645 of the upper middle plate 630 and the lower middle plate 640 are configured to uniformly expand toward the joint portions of both end portions 631 and 641 and the central portions 632 and 642. For example, as shown in FIG. 39, the arrangement density of the openings 635 and 645 in the peripheral regions 633 and 643 adjacent to both end portions 631 and 641 and the central portions 632 and 642 is set between the peripheral regions 633 and 643. This can be achieved by making it smaller than the arrangement density of the openings 635 and 645 in the central regions 634 and 644 located at the center.

  The shapes of the openings 635 and 645 are not limited to the same, and can be appropriately changed according to the arrangement positions on the upper middle plate 630 and the lower middle plate 640 as shown in FIG. 40, for example. It is.

  The openings 635 and 645 are not limited to notches, and for example, as shown in FIG. 41, it is possible to reduce the weight by applying notches. In this case, in consideration of the direction of tension generation during the hydraulic forming, the shape of the openings 635 and 645 is substantially elliptical, and the major axis direction is the both ends 631 and 641 of the upper intermediate plate 630 and the lower intermediate plate 640. And are preferably arranged along the joining direction at the central portions 632 and 642.

  In addition, for example, laser (drilling) processing or fine blanking (precision punching) processing is applied to the notch, and the inner periphery of the notch is smoothed to become a starting point of a crack or the like at the time of hydraulic forming. It is preferable to avoid this.

  As shown in FIG. 42, the upper intermediate plate 630 and the lower intermediate plate 640 apply the recesses 131 and 141 according to the second embodiment to form the gaps S1 to S3, thereby reducing erroneous welding. it can. Similarly, Embodiments 3 to 6 can be appropriately combined.

  As described above, in the seventh embodiment, it is possible to more reliably suppress the breakage of the reinforcing material.

  FIG. 43 is a cross-sectional view for explaining the eighth embodiment.

  The eighth embodiment is generally different from the first embodiment with respect to the shape of the preform and the configuration of the hydraulic pressure forming apparatus, and the preform 750 according to the eighth embodiment has an outer surface portion of the hydraulic molded product. The upper plate 710 and the lower plate 720 to be formed, the upper middle plate 730 and the lower middle plate 740 that are to form the reinforcing ribs of the hydraulic molded product, and the hydraulic pressure is applied by introducing the molding medium. And a non-joining portion 751 for the purpose.

  The upper middle plate 730 and the lower middle plate 740 are disposed inside the upper plate 710 and the lower plate 720. The non-joining portion 751 is configured by a contact surface between the end surface of the upper plate 710 and the lower plate 720, and the contact surface is preformed in a substantially conical shape. The non-joining portion 751 has an outer end surface on which a circular opening is disposed, and an inner front end portion 752 communicating with the inside of the preformed body 750. That is, the preform 750 has an opening formed by a contact surface between the end surface of one of the outer surface materials 710 and the end surface of the other 720. The non-joining part 751 is not limited to the form arranged over the entire end face, and may be partially arranged.

  The upper plate 710 is disposed relative to the cavity surface 771 of the upper mold 770. The lower plate 720 is disposed relative to the cavity surface 781 of the lower mold 780. The cavity surfaces 771 and 781 correspond to the outer surface portions of the molded product, respectively.

  The hydraulic pressure supply unit 790 includes a flow path 798 connected to the hydraulic circuit 799, a shaft pushing punch 791, and a shaft pushing cylinder 797. The shaft pushing punch 791 is disposed on the side surfaces of the upper die 770 and the lower die 780 and is connected to the shaft pushing cylinder 797. The shaft pushing punch 791 has a nozzle portion 792.

  The nozzle portion 792 has an injection port 793 communicating with the flow path 798 and has a substantially conical shape corresponding to the shape of the non-joining portion 751. The shaft pushing cylinder 797 supports the shaft pushing punch 791 such that the shaft pushing punch 791 can advance and retreat toward the mold (upper die 770 and lower die 780) side. The drive source of the shaft pushing cylinder 797 is, for example, hydraulic pressure or pneumatic pressure.

  When the nozzle portion 792 is inserted into the opening of the non-bonded portion 751 of the preform 750, the diameter of the non-bonded portion 751 is increased and the diameter of the non-bonded portion 751 is restricted by the upper mold 770 and the lower mold 780. As a result, the non-joining portion 751 is in close contact with the nozzle portion 792 and airtightness is ensured.

  The inlet 793 of the nozzle portion 792 is aligned with the inner front end portion 752 that communicates with the inside of the preform 750. Therefore, when the molding medium supplied from the hydraulic circuit 799 is introduced into the flow path 798 and the injection port 793, the molding medium passes through the non-joint portion 751 and the inner front end portion 752, and the preform 750 Injected inside.

  Therefore, the hydraulic pressure supply means 790 can bulge and deform by applying hydraulic pressure to the inside of the preform 750.

  As described above, in the eighth embodiment, the hydraulic pressure is applied by introducing the forming medium into the opening formed by the contact surface between one end surface of the outer surface members 710 and 720 and the other end surface. Then, by bulging and deforming the preform 750, it is possible to form reinforcing ribs that partition the outer surface portion of the hydraulic molded product and the hollow cross section of the hydraulic molded product.

  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, depending on the configuration of the target hydroformed product, the shape of the plate material constituting the first and second outer surface materials, the shape of the plate material constituting the reinforcing material, the arrangement position of the recess, the reinforcing material in the preform It is possible to appropriately change the arrangement form of the plate members to be configured.

  Further, by arranging and joining the first and second reinforcing members with offset, it is possible to form reinforcing ribs that evenly partition the hollow cross section of the hydroformed product in a substantially horizontal direction and a substantially vertical direction. It is also possible to obtain reinforcing ribs that unequally partition the hollow cross section of the hydroformed product by making the first and second reinforcing members different in shape.

FIG. 3 is a perspective view for explaining a hydraulic molded product according to the first embodiment. It is a top view for demonstrating the motor vehicle component to which the hydraulic-molded article 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 sectional drawing for demonstrating an example of the joining method of a lower middle board and an upper middle board, and has shown joining of the lower middle board with respect to a lower board. FIG. 8 is a cross-sectional view for explaining the joining of the upper middle plate to the lower middle plate following FIG. 7. FIG. 9 is a cross-sectional view for explaining the joining of the upper plate to the upper middle plate following FIG. 8. 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 forming 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 regarding line XIV-XIV of FIG. It is sectional drawing for demonstrating the shaping | molding initial stage following FIG. FIG. 16 is a cross-sectional view for explaining mold clamping following FIG. 15. It is sectional drawing for demonstrating the shaping | molding middle period following FIG. It is sectional drawing for demonstrating the shaping | molding latter stage following FIG. It is sectional drawing for demonstrating a deformation | transformation of the reinforcement rib by the fluctuation | variation of operation conditions. 5 is a cross-sectional view for explaining a preform according to Embodiment 2. FIG. It is sectional drawing for demonstrating the shape of the lower middle board and upper middle board which comprise the reinforcement material of the preform shown by FIG. It is sectional drawing for demonstrating an example of the joining method of the reinforcement material of a preforming body, and has shown joining of the lower center board with respect to a lower board. It is sectional drawing for demonstrating joining of the upper middle board with respect to the lower middle board following FIG. It is sectional drawing for demonstrating joining of the upper board with respect to an upper middle board following FIG. FIG. 6 is a cross-sectional view for explaining a preform according to a third embodiment. It is sectional drawing for demonstrating the lower middle board and upper middle board which comprise the reinforcing material which concerns on Embodiment 4. FIG. It is sectional drawing for demonstrating an example of the joining method of the reinforcing material shown by FIG. 26, and has shown joining of the upper middle board with respect to a lower middle board. It is sectional drawing for demonstrating joining of the lower middle board with respect to the lower board following FIG. It is sectional drawing for demonstrating joining of the upper board with respect to an upper middle board following FIG. FIG. 30 is a cross-sectional view for explaining the joining of the upper plate to the lower plate, following FIG. 29. FIG. 10 is a cross-sectional view for explaining a reinforcing material according to a fifth embodiment. FIG. 10 is a cross-sectional view for explaining an upper middle plate constituting a reinforcing material according to a sixth embodiment. It is sectional drawing for demonstrating the lower center board which comprises the reinforcing material which concerns on Embodiment 6. FIG. It is sectional drawing for demonstrating the fitting structure of the upper middle board of FIG. 32, and the lower middle board of FIG. FIG. 10 is a plan view for explaining the shapes of a lower middle plate and an upper middle plate that constitute a reinforcing material for a preformed body according to a seventh embodiment. FIG. 9 is a cross-sectional view for explaining a preform according to a seventh embodiment. It is a conceptual diagram for demonstrating the shape change of the opening part shown by FIG. It is a perspective view for demonstrating an example of the formation apparatus for forming the opening part shown by FIG. FIG. 38 is a plan view for explaining the first modification according to the seventh embodiment. FIG. 38 is a plan view for explaining the second modification according to the seventh embodiment. FIG. 10 is a conceptual diagram for explaining a third modification according to the seventh embodiment. FIG. 12 is a cross-sectional view for explaining a fourth modification according to the seventh embodiment. FIG. 10 is a cross-sectional view for illustrating an eighth embodiment.

Explanation of symbols

10. Upper plate (outer surface material),
11, 16, ... end,
12..Dome part,
15 ・ ・ Intermediate part,
15A ... outer peripheral part,
15B ... Central part,
20. Lower plate (outer surface material),
21, 26 .. end,
22 .. opening,
25. ・ Intermediate part,
25A ... outer peripheral part,
25B ... Central part,
30 .. Upper middle plate (reinforcing material),
31..End,
32 .. Central part,
40 .. Lower middle plate (reinforcing material),
41 .. end,
42 .. Central part,
50 .. Pre-formed body,
52, 54, 55, 56 .. junction,
60 ・ ・ Hydraulic molded products,
61, 62 ... outer surface,
61A, 62A .. side wall,
61B, 62B ...
63, 64 .. Reinforcing ribs,
65. Suspension parts,
70 .. Upper mold,
71 .. cavity surface,
75..Pressing part,
76 .. Recess,
76A ... tip part,
77, 78 .. Arc-shaped groove,
80 ... lower mold,
81 .. cavity surface,
85..Pressing part,
86..Recess,
90 .. hydraulic supply means,
91 .. Nozzle part,
92 .. Domed part,
93..Inlet,
94, 95 .. annular projection,
98 .. flow path,
99 ... Hydraulic circuit,
110 .. Upper plate (outer surface material),
120 .. Lower plate (outer surface material),
130 .. Upper middle plate (reinforcing material),
131 .. recess
132 .. back part,
140 .. Lower middle plate (reinforcing material),
141 .. recess
142 .. back part,
150 .. Pre-formed body,
152,154,155,156..Junction part,
158, 159 .. Chewing plate,
220 .. Lower plate (outer surface material),
230 .. Upper middle plate (reinforcing material),
232 .. back part,
240 .. Lower middle plate (reinforcing material),
241 .. Recess,
242 .. back part,
250 .. Pre-formed body,
254, 255 .. Joint part,
310 .. Upper plate (outer surface material),
320 .. Lower plate (outer surface material),
330 .. Upper middle plate (reinforcing material),
331 .. recess,
332 .. back part,
334 ..Protrusions,
335 .. back part,
340 .. Lower middle plate (reinforcing material),
341 .. Recess,
342 .. back part,
344 ..Protrusions,
345 .. back part,
350 ·· Preliminary body,
352, 354, 355, 356 .. joints,
410 .. Upper plate (outer surface material),
420 .. Lower plate (outer surface material),
430 .. Upper middle plate (reinforcing material),
434 .. abutting part,
440 .. Lower middle plate (reinforcing material),
441 .. recess,
442 .. back part,
444 .. Projection,
445 .. back part,
450 .. Pre-formed body,
455,456 ...
530 .. Upper middle plate (reinforcing material),
531 .. Recess,
532 .. back part,
534 .. Protrusions,
540 .. Lower middle plate (reinforcing material),
541 .. Recess,
542 .. back part,
544 .. receiving part,
544A .. Recessed part,
545 .. back part,
610 .. Upper plate (outer surface material),
611, 616 .. end,
615 ... Intermediate part,
615A, outer peripheral part,
615B ... Central part,
620 .. Lower plate (outer surface material),
621, 626 .. end,
625 .. middle part,
625A ... outer peripheral part,
625B ... Central part,
630 .. Upper middle plate (reinforcing material),
631 .. end,
632 .. Central part,
633 .. peripheral area,
634 .. Central area,
635 .. opening,
637 ... Material board,
638 ... Upper blade,
639 .. Lower blade,
640 .. Lower middle plate (reinforcing material),
641 .. end,
642 .. Central part,
643 .. peripheral area,
644 .. Central area,
645 .. opening
650 .. Pre-formed body,
652, 654, 655, 656 .. junction part,
710 .. Upper plate (outer surface material),
720 .. Lower plate (outer surface material),
730 .. Upper middle plate (reinforcing material),
740 .. Lower middle plate (reinforcing material),
750 .. Pre-formed body,
751 .. Non-joining part,
752 .. Inner tip,
770 ... Upper mold,
771..Cavity surface,
780 ... Lower mold,
781 ..Cavity surface,
790 .. hydraulic pressure supply means,
791, Punch,
792 .. Nozzle part,
793..Inlet,
797 ・ ・ Cylinder,
798 .. flow path,
799 ... Hydraulic circuit,
D ₁ , D ₂ .. Thickness,
S ₁ , S ₂ , S ₃ .. gap,
SW · Strand width,
W ... width.

Claims (12)

First and second outer surface materials that have edge portions that are overlapped and bonded, and that form the outer surface of a hydroformed product, and a hollow cross section of the outer surface that is bonded to the first and second outer surface materials A reinforcing material that will form reinforcing ribs that partition,
The said reinforcing material has a dimension which can suppress the elongation by the tension | tensile_strength of the tension | pulling direction generate | occur | produced in the case of hydraulic forming. The preforming body characterized by the above-mentioned.   The preform according to claim 1, wherein the dimension is set so that the tension does not act.   2. The preform according to claim 1, wherein the length between the joints in the reinforcing material is greater than the linear distance between the corresponding joints in the hydroformed product.   2. The preform according to claim 1, wherein the length between the joint portions in the reinforcing material is set so that the reinforcing rib has a slack that can be bent. The reinforcing material is composed of first and second reinforcing materials arranged in an overlapping manner,
The first and second reinforcing members are joined to each other at the center, and both ends of the first reinforcing member are joined to the first outer surface material, and both ends of the second reinforcing member are The preform according to claim 1, wherein the preform is joined to the second outer surface material.   6. The preform according to claim 5, wherein a length between the joint portion at the central portion and the joint portion at the both end portions is larger than a linear distance between corresponding joint portions in the hydroformed product. . The preform according to any one of claims 1 to 6 is disposed inside a molding die having a cavity corresponding to an outer surface shape of a hydroformed product,
Reinforcement that partitions the hollow cross section of the hydroformed product while suppressing the elongation of the reinforcing material due to the tension in the pulling direction when applying a hydraulic pressure to the inside of the preform and causing the preform to bulge and deform. A hydraulic forming method characterized by forming a rib.   8. The hydraulic molding method according to claim 7, wherein a hydraulic pressure is applied by injecting a molding medium into an opening formed in one of the first and second outer surface materials.   The hydraulic pressure is applied by introducing a forming medium into an opening formed by a contact surface between an end surface of the first outer surface material and an end surface of the second outer surface material. Hydroforming method. A hydraulic molded product molded using the hydraulic molding method according to any one of claims 7 to 9,
Reinforcing ribs that partition the hollow cross section of the outer surface of the hydroformed product are formed by suppressing the expansion of the reinforcing material due to tension in the tensile direction that occurs during hydroforming. .   The hydroformed product according to claim 10, wherein the hydroformed product is a vehicle body structural member of an automobile.   The hydroformed product according to claim 11, wherein the vehicle body structural member of the automobile is a suspension component.

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