JP2008296252A - Press molded product, and manufacturing method and fabrication equipment of press molded product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain lightening of a weight, and reduction of a manufacturing cost of a press molded product. <P>SOLUTION: A press molding process includes a step of obtaining the press molded product from a blank 100 having a throughhole 118 to suppress flow of a material. The press molded product has a partially thickened wall portion arranged at a local position. The blank 100 has an expected wall thickening portion 112 corresponding to the partially thickened wall portion. The throughhole 118 is arranged at an edge of the expected wall thickening portion 112. In the press molding process, the partially thickened wall portion of the press molded product is formed by pushing a part 114 of the blank 100 to generate the flow of the material which causes an increase in a cross-sectional thickness. The flow of the material from the expected wall thickening portion 112 to a peripheral portion 116 of the expected wall thickening portion 112 is suppressed by the throughhole 118. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a press-formed product, a method for manufacturing a press-formed product, and a manufacturing apparatus.

A press-molded product such as a suspension part of a vehicle is manufactured from a tailored blank (see, for example, Patent Document 1). A tailored blank is formed by previously joining and integrating two dissimilar steel plates. For example, one dissimilar steel plate is made of a thick steel plate and is applied to a local site where rigidity or strength is required. The other dissimilar steel plate is made of a thin steel plate and is applied to a portion where rigidity or strength is relatively not required.
JP 2005-152975 A

  Since one dissimilar steel plate is made of a thin steel plate, it is possible to reduce the weight of the press-formed product, but there is a problem in manufacturing cost. That is, since joining of dissimilar steel plates is performed by welding the butt portions of dissimilar steel plates, high butt accuracy is required, and it is difficult to improve productivity, leading to an increase in manufacturing cost.

  The present invention has been made to solve the problems associated with the above-described prior art, and aims to reduce the weight of the press-formed product and the manufacturing cost.

In order to achieve the above object, the invention described in claim 1
From a blank having a suppression means to suppress the flow of the material, having a press molding process for obtaining a press molded product,
The press-molded product has a partially thickened portion arranged at a local site,
The blank has a thickening scheduled portion corresponding to the partial thickening portion,
The suppression means is disposed at an edge of the thickening scheduled portion,
In the press molding process,
The partially thickened portion is formed by pushing a part of the blank and generating a flow of material that causes an increase in cross-sectional thickness, and
The said material is a manufacturing method characterized by the flow from the said thickening planned part to the peripheral part of the said thickening planned part being suppressed by the said suppression means.

In order to achieve the above object, the invention according to claim 18 provides:
A press-formed product formed by the manufacturing method according to any one of claims 1 to 17, wherein the partial thickened portion is disposed at a local site where rigidity or strength is required. It is a press-formed product.

In order to achieve the above object, the invention according to claim 28 provides
From a blank having suppression means for suppressing the flow of material, having a press mold for obtaining a press-molded product,
The press-molded product has a partially thickened portion arranged at a local site,
The blank has a thickening scheduled portion corresponding to the partial thickening portion,
The suppression means is disposed at an edge of the thickening scheduled portion,
The press mold is configured to form the partial thickened portion by pressing a part of the blank and generating a flow of a material that causes an increase in cross-sectional thickness; and
The material is a manufacturing apparatus characterized in that a flow from the planned thickness increase portion to the peripheral portion of the planned thickness increase portion is suppressed by the suppression means.

  According to the present invention, a partially thickened portion is formed in a local portion of a press-formed product by pressing a part of the blank and generating a flow of a material that causes an increase in cross-sectional thickness. Moreover, since the flow to the peripheral part of the material which causes the increase in cross-sectional thickness is suppressed by the suppressing means for suppressing the flow of the material, it has a good thickness increasing efficiency. Therefore, even if a thin blank is applied, the rigidity or strength of the press-formed product is ensured by the partially thickened portion where the cross-sectional thickness is efficiently increased, so that the press-formed product can be easily reduced in weight. It is possible. Moreover, since a partial thickness increase part is formed by press molding which has favorable productivity compared with the tailored blank to which butt welding is applied, manufacturing cost is reduced. Therefore, it is possible to reduce the weight of the press-formed product and reduce the manufacturing cost.

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

  1 is a perspective view for explaining a press-formed product according to Embodiment 1, FIG. 2 is a cross-sectional view for explaining a partially thickened portion of the press-formed product, and FIG. 3 is a partially thickened portion. It is sectional drawing for demonstrating the adjacent non-thickening part.

  The press-formed product 120 according to the first embodiment is a substantially polygonal long object having an open cross section, and includes an edge 122, a side wall 124 extending from the edge 122, and a connection wall 126 that connects the side walls 124. Manufactured from a blank made of rolled material. Note that press molding includes a forging press.

  The press-formed product 120 has a partial thickened portion 132 disposed at a local site where rigidity or strength is required. The partially thickened portion 132 extends in the circumferential direction intersecting the extending direction of the press-formed product 120, and the side wall 124 and the connecting wall 126 of the partially thickened portion 132 are the side wall 124 and the connecting wall of the non-thickened portion 136. Compared to 126, the cross-sectional thickness is increased. The increase in the cross-sectional thickness is caused by the flow of material generated by pressing a part of the blank during press molding.

  The connecting wall 126 has a through hole 138 disposed at the edge of the partial thickening portion 132. The through hole 138 corresponds to a blank through hole. As will be described later, the blank through hole constitutes a suppression means for suppressing the flow of the material that causes an increase in the cross-sectional thickness to the peripheral portion, and improves the thickness increase efficiency of the partial thickness increase portion 132. It has a function.

  Accordingly, even if a thin blank is applied, rigidity or strength is ensured by the partially thickened portion 132 whose cross-sectional thickness is efficiently increased, so that the weight of the press-formed product 120 can be easily reduced. Is possible. Moreover, since the partial thickness increase part 132 is formed by the press molding which has favorable productivity compared with the tailored blank to which butt welding is applied, the press-molded product 120 becomes a thing by which the manufacturing cost was reduced. .

  4 is a plan view for explaining a suspension component to which the press-formed product according to Embodiment 1 is applied, and FIG. 5 is a cross-sectional view taken along line VV in FIG.

  The suspension component 140 has an upper side member 142 and a lower side member 144 that have a hollow, substantially rectangular cross section and whose edges are welded together. The upper side member 142 and the lower side member 144 are substantially polygonal long objects having an open cross section, and by applying the press-molded product 120, it is possible to reduce the weight of the suspension component 140 and reduce the manufacturing cost. It is.

  The local site requiring rigidity or strength is a site to which a bracket 146 for fastening another component such as an arm is fixed. That is, since the bracket 146 is fixed to the partially thickened portion 132 of the press-formed product 120, good fixing strength is ensured. In particular, when welding is applied to fixing, fatigue strength is improved, which is preferable.

  Next, the blank and press-formed product manufacturing apparatus according to Embodiment 1 will be described.

  FIG. 6 is a perspective view for explaining the blank according to the first embodiment, FIG. 7 is a sectional view for explaining the press-formed product manufacturing apparatus according to the first embodiment, and FIG. 9 is a perspective view for explaining the lower mold shown in FIG.

  The manufacturing apparatus 150 includes a press mold for obtaining the press-formed product 120 from the blank 100. The press mold can form the partially thickened portion 132 by generating a flow of a material that causes an increase in the cross-sectional thickness by pushing a part of the blank 100.

  More specifically, the blank 100 put into the manufacturing apparatus 150 is a preformed body formed from a rolled material by press forming, and the shape thereof corresponds to the shape of the press-formed product 120, and the edge portion 102, A side wall 104 extending from the edge 102 and a connecting wall 106 connecting the side walls 104 are provided.

  The blank 100 has a thickening planned portion 112 and a thickening non-scheduled portion 116 corresponding to the partial thickening portion 132 and the non-thickening portion 136 of the press-formed product 120. The circumferential region including the thickening scheduled portion 112 has a circumferential length extension portion, and the circumferential length of the circumferential region includes the partial thickening portion 132 of the press-formed product 120. A part of the blank 100 to be pushed in is longer than the circumferential length of the cross section of the region, which is a circumferential length extension portion. Therefore, it is possible to easily generate a material flow that causes an increase in cross-sectional thickness. The unthickened portion 116 is a peripheral portion of the planned thickening portion 112.

  The circumferential extension portion is composed of an extension portion 114 disposed on the edge portion 102 of the blank 100. The circumferential length of the circumferential region including the planned thickening portion 112 is longer than the circumferential length of the circumferential region including the unplanned thickness increasing portion 116.

  The connecting wall 106 has a through hole 118 disposed at the edge of the thickening scheduled portion 112. The through hole 118 corresponds to the through hole 138 of the press-formed product 120 and has a structure that inhibits the transmission of compressive stress. The shape of the through-hole 118 is not particularly limited, but is preferably a circular shape in order to avoid stress concentration during press molding.

  It is preferable in terms of productivity and cost that the extension 114 and the through hole 118 are formed by punching when the blank 100 is preformed from the rolled material. However, the extension 114 and the through hole 118 can be separately formed by machining. The blank 100 is not limited to being formed from a rolled material, and for example, a cast product can be applied.

  The press mold includes an upper mold 160 and a lower mold 170 that are arranged to be close to and away from each other, and a side mold 180. The upper die 160 is a die portion having an inner surface portion corresponding to the outer surface shape of the press-formed product 120. The lower die 170 is a punch portion having an outer surface portion corresponding to the inner surface shape of the press-formed product 120, and the blank 100 is disposed between the upper die 160 and the die is clamped.

  The lower mold 170 has a step 172 that extends along the edge 102 of the arranged blank 100. When the upper mold 160 and the lower mold 170 are clamped, the extension portion 114 of the blank 100 is pressed in contact with the stepped portion 172 of the lower mold 170 to generate a material flow that causes an increase in cross-sectional thickness. Let At this time, the through-hole 118 disposed at the edge of the planned increase in thickness 112 of the blank 100 suppresses the flow of material from the planned increase in thickness 112 to the non-scheduled increase in thickness 116, thereby improving the efficiency of increase in thickness. Let In particular, since the through hole 118 is located on the connecting wall 106 and suppresses material dispersion via the connecting wall 106, it is easy to increase the thickness of the connecting wall 126 of the press-formed product 120.

  The die clearances of the inner surface portions of the upper die 160 and the lower die 170 corresponding to the circumferential region including the planned thickening portion 112 of the blank 100 are set in consideration of the thickening due to material flow. That is, the mold clearance is set larger than the cross-sectional thickness of the blank 100 so as to allow the material to flow and increase in thickness.

  The side mold 180 is disposed on the side of the upper mold 160 and the lower mold 170 and is positioned so as to face the end face 108 of the blank 100. When the side mold 180 is clamped and press-molded, the side mold 180 abuts against the end surface 108 of the blank 100 to stop the movement of the end surface 108, thereby preventing the material flow in the extending direction of the blank 100. It is a prevention means.

  Next, a method for manufacturing a press-formed product according to Embodiment 1 will be described.

  FIG. 10 is a cross-sectional view for explaining the process of forming the partially thickened portion, FIG. 11 is a cross-sectional view showing the process of pushing the extension of the blank shown in FIG. 10, and FIG. 12 is the partially thickened portion. It is sectional drawing for demonstrating the formation process of the non-thickening part adjacent to.

  This manufacturing method has a press molding process for obtaining the press-molded product 120 from the blank 100 formed from the rolled material. In the press molding process, the partial thickened portion 132 of the press-molded product 120 is The material is formed by indenting a part and generating a flow of the material that causes an increase in cross-sectional thickness, and the material is passed from the planned increase in thickness to the periphery of the planned increase in thickness by a through-hole 118. Flow is suppressed.

  More specifically, first, the blank 100 is placed on the lower mold 170. The extension part 114 of the blank 100 contacts the step part 172 of the lower mold 170. Since the circumferential area including the non-scheduled portion 116 has a shorter sectional circumferential length than the circumferential area including the extension 114, the circumferential area is separated from the stepped portion 172 of the lower mold 170.

  When the upper mold 160 is lowered toward the lower mold 170 for clamping and press molding, the inner surface portion of the upper mold 160 comes into contact with the connecting wall 106 of the blank 100 disposed on the lower mold 170. The clamping force of the upper mold 160 presses the extension part 114 of the blank 100 toward the step part 172 of the lower mold 170, so that the extension part 114 is deformed (see FIG. 11).

  Until the mold clamping is completed, a space allowing the material to flow and increase in thickness exists between the inner surface portion of the upper die 160 and the top surface of the outer surface portion of the lower die 170, and the blank 100 is provided in the space. The connecting wall 106 is located. Therefore, the material of the extension 114 flows upward. At this time, the extension portion 114 is located at the edge 102 of the circumferential region including the thickening planned portion 112, and the mold clearance is set in consideration of the thickening due to the flow of the material. The flow of the material 114 causes an increase in the cross-sectional thickness of the planned thickening portion 112 (see FIG. 10).

  On the other hand, a through hole 118 is located at the edge of the thickening planned portion 112. Since the through-hole 118 suppresses the flow from the thickening scheduled portion 112 to the unthickened planned portion 116 by inhibiting the transmission of the compressive stress, the thickening efficiency is improved. Thereby, the partial thickening part 132 of the press molded product 120 is formed easily and efficiently. In particular, since the through hole 118 is located on the connecting wall 106 and suppresses material dispersion via the connecting wall 106, it is easy to increase the thickness of the connecting wall 126 of the press-formed product 120.

  Side molds 180 are located on the sides of the upper mold 160 and the lower mold 170. The side mold 180 abuts on the end surface 108 of the blank 100 and stops the movement of the end surface 108. Since the material of the extension part 114 is suppressed from flowing in the extending direction of the blank 100, it mainly flows in the circumferential direction. That is, the cross-sectional thickness of the circumferential region increases efficiently.

  The circumferential region including the non-thickened portion 116 of the blank 100 substantially coincides with the circumferential region including the non-thickened portion 136 of the press-formed product 120 and does not have the extension 114. . Therefore, it is not pushed by the step part 172 of the lower mold 170, and no material flow that causes an increase in the cross-sectional thickness occurs, and the cross-sectional thickness does not increase (see FIG. 12). Thereby, the non-thickened portion 136 of the press-formed product 120 is formed.

  FIGS. 13 to 15 are cross-sectional views for explaining the first to third modifications according to the first embodiment.

  When the local site requiring rigidity or strength is small, adjusting the shape of the blank extension, the inner surface shape of the upper die and the lower die, the die clearance, etc. allows the partially thickened portion 132 of the press-formed product to be surrounded. It is also preferable to occupy only a part of the direction area.

  For example, as shown in FIG. 13, when a small bracket 147 is applied as compared with the size of the suspension component 140, the partial thickening portion 132 is arranged only in a portion where the bracket 147 is attached by welding and in the vicinity thereof. As a result, it is possible to efficiently reduce the weight of the suspension component 140.

  When the nut 148 is fixed as a fastening means, a reinforcing plate is applied to improve the strength of the root of the nut 148. However, as shown in FIG. 14, it is possible to eliminate the reinforcing plate by disposing the partially thickened portion 132 at a site where the nut 148 is attached by welding.

  Furthermore, in order to fasten another part, as shown in FIG. 15, it is also possible to form a hole 149 in the partially thickened portion 132. Compared with the non-thickened portion 136, the partially thickened portion 132 is preferable because the formation of the hole 149 is easy. In particular, when the hole 149 is tapped and used as an alternative to the nut 148, the nut 148 can be eliminated.

  As described above, according to the first embodiment, it is possible to form a partially thickened portion at a local site that requires rigidity or strength in a press-formed product. Moreover, since the flow to the peripheral part of the material which causes the increase in the cross-sectional thickness is suppressed by the through-hole, it has a good thickness increasing efficiency. Therefore, even if a thin blank is applied, the rigidity or strength of the press-formed product is ensured by the partially thickened portion where the cross-sectional thickness is efficiently increased, so that the press-formed product can be easily reduced in weight. It is possible. Furthermore, since the partially thickened portion is formed by press molding having good productivity as compared with a tailored blank to which butt welding is applied, the press-molded product has a reduced manufacturing cost. Therefore, it is possible to reduce the weight of the press-formed product and reduce the manufacturing cost.

  Moreover, since the through-hole is arrange | positioned at the connection wall of a blank, it is possible to increase the thickness of the connection wall of a press molded product efficiently. Furthermore, since the circumferential length extension part is comprised from the extension part arrange | positioned at the edge part of the side wall of a blank, it is possible to increase the thickness of the side wall of a press-molded product efficiently.

  The through hole can be arranged on the side wall of the blank, or can be arranged on both the connecting wall and the side wall. Moreover, it is also preferable to arrange the through hole so as to be positioned on a fixing surface between the partially thickened portion and another component. In this case, since another component functions as a reinforcing material, it is possible to suppress the influence of the through hole on the rigidity of the press-formed product. The through hole can be arranged at the edge of the side wall of the blank or can be arranged only at one edge. The size and the number of the through holes are preferably set as appropriate according to the size and shape of the blank thickening scheduled portion and the partial thickening portion of the press-formed product.

  It is also possible to arrange the extension part constituting the circumferential extension part on the end face of the blank or on only one side face. It is also possible to arrange a plurality of extension portions with an interval in the extension direction of the blank. In this case, the press-formed product has partial thickening portions that are arranged with an interval in the extending direction.

  The circumferential length of the circumferential region including the planned thickness increase portion of the blank is not limited to a form longer than the circumferential length of the circumferential region including the non-scheduled thickness portion. That is, the extension of the blank is not limited to the shape protruding from the edge of the circumferential region including the adjacent non-scheduled thickening portion, and is flush with the edge according to the shape of the press-formed product. It is also possible to have a shape (recessed shape) that is positioned at the edge or retracted from the edge. In this case, the extension portion can be pushed in by providing a projecting portion that contacts the extension portion in the step portion of the lower mold.

  Next, a second embodiment will be described.

  FIG. 16 is an exploded view for explaining the apparatus for manufacturing a press-formed product according to the second embodiment, and FIG. 17 is a perspective view for explaining the lower mold shown in FIG. In the following, members having the same functions as those in the first embodiment are denoted by similar reference numerals, and the description thereof is omitted to avoid duplication.

  The press-molded product manufacturing apparatus 250 according to the second embodiment has a restraining mechanism that restrains the connecting wall 206 of the blank 200 disposed in the lower mold 270, and thus the press-molded product manufacturing apparatus according to the first embodiment. Generally different from 150.

  The restraining mechanism includes an insertion hole 291, a pad portion 292, a stopper 293, a spring mechanism 294, a support member 295, and a pin member 298. The insertion hole 291 is disposed at the top of the lower mold 270. The pad portion 292 is disposed so as to protrude from the insertion hole 291 and is urged in a direction protruding from the insertion hole 291. The urging force of the pad portion 292 is smaller than the clamping force of the lower mold 270 and the upper mold 260.

  Since the pad portion 292 is retracted toward the inside of the insertion hole 291 as the upper die 260 is lowered, the pad portion 292 does not affect the clamping of the lower die 270 and the upper die 260. Further, since the connecting wall 206 of the blank 200 disposed on the lower mold 270 is pressed by the inner surface portion of the upper mold 260, it is restrained by being supported by the pad portion 292.

  Therefore, in the initial stage of press molding, the space generated between the inner surface portion of the upper mold 260 and the pad portion 292 is maintained constant, and the connection wall 206 of the blank 200 is caused by the flow of material from the extension portion 214. Since excessive bending is avoided, buckling of the connecting wall 106 can be suppressed. That is, even when the indentation ratio is increased, it is possible to suppress buckling of the connecting wall 206 of the blank 200 and further increase the thickness of the partially thickened portion of the press-formed product.

  The stopper 293 is a restraining means for restraining the pad portion 292 from retreating in the insertion hole 291 of the lower mold 270, and is composed of a reduced diameter portion disposed in the insertion hole 291. The diameter is smaller than the diameter of the pad portion 292. small. The position of the stopper 293 is set so that the end face of the pad portion 292 that is restrained and the top portion of the lower mold 270 are located on the same plane. Therefore, the material of the connecting wall 206 of the blank 200 is suppressed from flowing into the insertion hole 291, and the formation of a mark or a recess corresponding to the insertion hole 291 is prevented.

  The spring mechanism 294 is urging force generating means used to generate urging force of the pad portion 292. The spring mechanism 294 has a simple structure and is preferable. However, for example, an actuator or a hydraulic cylinder can be used instead. Reference numeral 254 indicates a base of a press mold in which the spring mechanism 294 is disposed.

  The support member 295 has a base portion 296 and a shaft portion 297, and is disposed between the pad portion 292 and the spring mechanism 294. The base 296 is located below the lower mold 270 and is disposed so as to be in contact with the lower mold 270. The shaft portion 297 is inserted into the insertion hole 291 of the lower mold 270 and supports the pad portion 292 in a separable manner.

  The length of the shaft portion 297 is set so that the pad portion 292 protrudes from the insertion hole 291 of the lower die 270 in a state where the base portion 296 is in contact with the lower die 270. Since the shaft portion 297 is not connected to the pad portion 292, the support member 295 can continue to retreat even when the retreat of the pad portion 292 is stopped by the stopper 293.

  The pin member 298 is disposed so as to face the base portion 296 of the support member 295 and protrude from the upper mold 260. When the upper die 260 is lowered for clamping, the pin member 298 contacts the base 296 of the support member 295 and lowers the support member 295. As a result, the pad portion 292 positioned above the shaft portion 297 of the support member 295 is lowered while restraining the connecting wall 206 of the blank 200. In other words, the restraining mechanism has an interlocking mechanism for interlocking the clamping of the upper mold 260 and the lower mold 270 with the restraint of the connecting wall 206 of the blank 200 by the pad portion 292.

  Next, a method for manufacturing a press-formed product according to Embodiment 2 will be described.

  18 is a cross-sectional view for explaining the lowering of the upper die shown in FIG. 17, and FIG. 19 is a cross-sectional view for explaining the contact between the upper die and the pin member of the restraining mechanism, following FIG. 20 is a cross-sectional view for explaining the curved portion formed on the connecting wall of the blank following FIG. 19, and FIG. 21 is a cross-sectional view for explaining the flat portion formed on the curved portion, following FIG. FIG. 22 and FIG. 22 are cross-sectional views for explaining disappearance of the bending portion, following FIG.

  This manufacturing method is generally different from the method for manufacturing a press-formed product according to the first embodiment in that buckling of the connecting wall 206 is suppressed by restraining the connecting wall 206 of the blank 200.

  First, the blank 200 is disposed on the lower mold 270. The extension part 214 of the blank 200 abuts on the step part 272 of the lower mold 270. The pad portion 292 is biased by the spring mechanism 294 via the support member 295 and protrudes from the insertion hole 291 of the lower mold 270.

  The upper mold 260 is lowered toward the lower mold 270 in order to clamp and press-mold (see FIG. 18). The pin member 298 disposed so as to protrude from the upper mold 260 abuts on the base 296 of the support member 295 (see FIG. 19). At this time, a space exists between the inner surface portion of the upper mold 260 and the pad portion 292.

  When the inner surface portion of the upper mold 260 comes into contact with the connecting wall 206 of the blank 200 disposed on the lower mold 270, the clamping force of the upper mold 260 causes the extension 214 of the blank 200 to be stepped on the step of the lower mold 270. By pressing toward the portion 272, the extension 214 is pushed upward, causing the material of the extension 114 to flow. Thereby, the connection wall 206 of the blank 200 deform | transforms and forms a curved part.

  On the other hand, the pad portion 292 restrains the connecting wall 206 of the blank 200 and interlocks with the operation of the upper die 260 while maintaining the space a generated between the inner surface portion of the upper die 260 and the pad portion 292 constant. And retreats (see FIG. 20). A through hole 218 is located at the edge of the thickening planned portion of the connecting wall 206. The through hole 218 inhibits the flow of the compressive stress and thereby suppresses the flow from the thickening scheduled portion to the non-thickened planned portion, thereby improving the thickness increasing efficiency of the connecting wall of the press-formed product.

  When the lowering of the upper mold 260 continues, the pad portion 292 deforms the curved portion of the connecting wall 206 of the blank 200 and generates a flat portion F (see FIG. 21). Therefore, the connecting wall 206 of the blank 200 is prevented from being excessively deformed, and the bending portion is suppressed from buckling.

  When the lowering of the upper die 260 continues further, the urging force of the pad portion 292 is smaller than the clamping force of the lower die 270 and the upper die 260, so that the pad portion 292 moves back into the insertion hole 291 of the lower die 270, and the stopper It is stopped by 293. The shaft portion 297 of the support member 295 supporting the pad portion 292 is separated from the pad portion 292, and the support member 295 continues to retreat.

  Thereby, the space generated between the inner surface portion of the upper mold 260 and the pad portion 292 is gradually reduced, and the curved portion of the connecting wall 206 of the blank 200 is pressed by the upper mold 260 and disappears ( (See FIG. 22). Thereby, the press-formed product which has a partial thickening part is obtained. In addition, since the end surface of the pad part 292 restrained by the stopper 293 and the top part of the lower mold 270 are located on the same plane, a mark or a hollow part corresponding to the insertion hole 291 is formed in the obtained press-formed product. Is prevented.

  As described above, the second embodiment can suppress the buckling of the blank by restraining the connecting wall of the blank even when the indentation ratio is increased. In comparison, it is possible to further increase the thickness of the partially thickened portion of the press-formed product.

  Next, a third embodiment will be described.

  FIG. 23 is a perspective view for explaining the blank according to the third embodiment, FIG. 24 is a cross-sectional view for explaining the press-formed product manufacturing apparatus according to the third embodiment, and FIG. It is a perspective view for demonstrating the lower mold | type shown.

  The blank 300 according to Embodiment 3 has an overhang portion 315 arranged on the connecting wall 306. The overhang portion 315 is located in the circumferential region including the planned thickening portion 312 corresponding to the partially thickened portion of the press-molded product, and the cross-sectional circumferential length of the circumferential region is set to the partially thickened portion of the press-molded product. Is longer than the cross-sectional circumference of the circumferential region including That is, the overhang portion 315 constitutes a circumferential extension portion, which is different from the first embodiment constituted by the extension portion 114 disposed on the edge portion 102 of the side wall 104, and as will be described later, It is possible to efficiently increase the thickness of the connecting wall of the molded product.

  It is preferable to form the overhang portion 315 in terms of productivity and cost when preforming the blank 300 from a rolled material. The through hole 318 that suppresses the flow of the material is located adjacent to the overhanging portion 315 and at the edge of the connection wall 306 thickening scheduled portion 312.

  A press-molded product manufacturing apparatus 350 according to Embodiment 3 includes an upper die 360 and a lower die 370 that are arranged to be close to and away from each other, and a side die 380. The lower mold 370 has a step 372 extending along the edge 302 of the arranged blank 300. The side mold 380 is disposed on the side of the upper mold 360 and the lower mold 370 and is positioned so as to face the end surface 308 of the blank 300.

  In the method for manufacturing a press-formed product according to the third embodiment, first, the blank 300 is placed on the lower mold 370. The edge 302 of the blank 300 is in contact with the step 372 of the lower mold 370.

  When the upper die 360 is lowered toward the lower die 370 for clamping and press forming, the inner surface portion of the upper die 360 is an overhang portion arranged on the connecting wall 306 of the blank 300 arranged on the lower die 370. 315 abuts. The clamping force of the upper mold 360 presses the overhang portion 315 toward the inner surface of the lower mold 170. On the other hand, the end surface 308 of the edge 302 of the blank 300 is restrained by the step 372 of the lower mold 370.

  As a result, the overhanging portion 315 is deformed, and the material of the overhanging portion 315 flows to the connecting wall 306 and the side wall 304 of the blank 300, causing an increase in the cross-sectional thickness of the thickening scheduled portion 312. At this time, since the overhang portion 315 is disposed on the connecting wall 306, the connecting wall of the press-formed product is efficiently thickened.

  A through hole 318 is located at the edge of the planned thickening portion 312 of the connecting wall 306 adjacent to the overhang portion 315. The through-hole 318 suppresses the flow of the compressive stress, thereby suppressing the flow from the thickening scheduled portion 312 to the non-scheduled thickening portion, thereby improving the thickness increasing efficiency of the connecting wall of the press-formed product.

  FIG. 26 is a perspective view for explaining a modification of the third embodiment.

  The overhang portion 315 is not exclusive to the extension portion 114 according to the first embodiment. For example, it is possible to configure the circumferential length extension portion by the overhang portion 315 and the extension portion 114. In this case, it is possible to efficiently increase the thickness of the connecting wall and the side wall of the press-formed product.

  As described above, in the third embodiment, similarly to the first embodiment, it is possible to reduce the weight of the press-formed product and reduce the manufacturing cost. Moreover, since the circumferential length extension site | part in Embodiment 3 is comprised from the overhang | projection part arrange | positioned at the connection wall of a blank, it is especially possible to increase the connection wall of a press-molded product efficiently.

  In addition, it is also possible to arrange | position an overhang | projection part on the end surface of a blank. It is also possible to arrange a plurality of overhang portions with a gap in the extending direction of the blank. In this case, the press-formed product has partial thickening portions that are arranged with an interval in the extending direction.

  When the local site that requires rigidity or strength is small, it is preferable that the partially thickened portion of the press-molded product occupies only a part of the circumferential region by adjusting the shape of the overhang portion and the mold clearance. For example, it is possible to efficiently reduce the weight of the press-molded product by reducing the overhang and forming the partially thickened part only on a part of the connecting wall of the press-molded product (implementation). (See Modifications 1 to 3 of Form 1).

  Next, a fourth embodiment will be described.

  FIG. 27 is a perspective view for explaining the blank according to the fourth embodiment, and FIG. 28 is an exploded view for explaining the press-formed product manufacturing apparatus according to the fourth embodiment.

  The blank 400 according to the fourth embodiment has an overhanging portion 415 disposed on the side wall 404 and is generally different from the blank 300 according to the third embodiment including the overhanging portion 315 disposed on the connecting wall 406. Further, the through hole 418 for suppressing the flow of the material is located at the edge of the thickening scheduled portion 412 of the connecting wall 406.

  A press-formed product manufacturing apparatus 450 according to Embodiment 4 includes an upper mold 460, a lower mold 470, and a side mold (not shown).

  The upper mold 460 has a plurality of divided molds including a first horizontal mold 490, a second horizontal mold 495, and an upper mold 465. The first and second lateral molds 490 and 495 are first divided molds, and are arranged so as to be close to and away from each other and integrally have an inner surface portion corresponding to the outer surface shape of the press-formed product. The upper mold 465 is a second divided type, and is opposed to the lower mold 470 via the first and second lateral molds 490 and 495, and drives the first and second lateral molds 490 and 495 to move the upper mold. 460 and lower mold 470 are used to exert the clamping force.

  The first lateral mold 490 has a side wall 491, an extension 493, and a slope 492. The side wall 491 has an inner surface portion that faces the one overhang portion 415 and corresponds to the outer surface shape of the one side wall of the press-formed product. The extension portion 493 has an inner surface portion that is opposite to the blank connection wall 406 and that corresponds to the outer surface shape of the press-molded connection wall. The slope 492 is disposed on the outer periphery of the corner portion connecting the side wall 491 and the extension portion 493. The mold clearance between the extension 493 and the blank connecting wall 406 is set in consideration of the increase in thickness due to the flow of the material. That is, the mold clearance is set larger than the cross-sectional thickness of the blank 400 so as to allow the material to flow and increase in thickness.

  The second lateral mold 495 has a slope 497 and a side wall 496. The slope 497 is disposed on the outer periphery of the upper corner portion. The inclined surface 497 and the inclined surface 492 of the first lateral mold 490 are inclined in a separating direction.

  The side wall 496 has an inner surface portion facing the other overhanging portion 415 and corresponding to the outer surface shape of the other side wall of the press-formed product. The height of the side wall 496 is substantially the same as the height of the side wall 491 of the first lateral mold 490, and the second lateral mold 495 is formed between the extension part 493 of the first lateral mold 490 and the step part 472 of the lower mold 470. It can be freely inserted into the space formed between them.

  The stop position when the first and second lateral molds 490 and 495 approach each other is set in consideration of the increase in thickness due to material flow. That is, the mold clearance between the side walls 491 and 496 and the blank side wall 404 at the stop position is set larger than the cross-sectional thickness of the blank 400 so as to allow the material to flow and increase in thickness.

  Accordingly, when the first and second lateral molds 490 and 495 are driven so as to be close to each other, the side wall 491 of the first lateral mold 490 and the side wall 496 of the second lateral mold 495 are in contact with the overhanging portion 415 and By pressing the portion 415, a material flow causing an increase in the cross-sectional thickness is generated. At this time, since the overhang portion 415 is disposed on the side wall 404, the side wall of the press-molded product can be efficiently increased in thickness.

  The upper die 465 has a concave shape in cross section, has a base portion and a protruding portion extending from both ends of the base portion, and can be moved close to and away from the first and second laterally-oriented dies 490 and 495. The protrusion of the upper mold 465 has inclined surfaces 466 and 467 corresponding to the inclined surfaces 492 and 497 of the first and second lateral molds 490 and 495.

  When the upper die 465 comes close to the lower die 470, the slopes 466 and 467 of the protruding portions come into contact with the slopes 492 and 497 of the first and second laterally facing molds 490 and 495. Press in the direction. As a result, the first and second lateral molds 490 and 495 are driven so as to be close to each other, abut against the projecting portion 415, and are pushed in.

  That is, the manufacturing apparatus 450 has an interlocking mechanism for interlocking the proximity of the upper mold 465 with the lower mold 470 and the contact of the first and second lateral molds 490 and 495 with the overhanging portion 415. In particular, this interlocking mechanism uses the contact of the inclined surfaces 466, 467, 492, and 497, which is preferable in that the structure is simplified. An independent driving mechanism or driving device can be applied to each of the first and second lateral molds 490 and 495.

Next, a method for manufacturing a press-formed product according to Embodiment 4 will be described. FIG. 29 is a cross-sectional view for explaining the lowering of the upper mold shown in FIG. 28, and FIG. Sectional drawing for demonstrating the curved part formed in a side wall, FIG. 31 is sectional drawing for demonstrating the loss | disappearance of a curved part following FIG.

  First, the blank 400 is disposed on the lower mold 470. The edge portion 402 of the blank 400 contacts the step portion 472 of the lower mold 470.

  First and second lateral molds 490, 495 are disposed outside the blank 400. At this time, the side wall 491 and the extension 493 of the first lateral mold 490 are opposed to the one overhanging portion 415 and the connecting wall 406 of the blank, and the side wall 496 of the second lateral mold 495 is opposed to the other overhanging portion 415. Are positioned as follows.

  When the upper mold 465 is lowered toward the lower mold 470 in order to clamp and press-mold, the inclined surfaces 466 and 467 of the upper mold 465 are the first and second lateral molds 490, which are located above the lower mold 470. It abuts on slopes 492 and 497 of 495 (see FIG. 29).

  The clamping force of the upper mold 465 pushes the inclined surfaces 492 and 497 in the directions approaching each other via the inclined surfaces 466 and 467 and drives the first and second laterally facing molds 490 and 495 to approach each other. The side wall 491 of the first lateral mold 490 and the side wall 496 of the second lateral mold 495 are in contact with one and the other overhanging portion 415 to push the overhanging portion 415 and generate a material flow that causes an increase in cross-sectional thickness (see FIG. 30). Thereby, the overhang | projection part 415 deform | transforms and forms a curved part.

  When the lowering of the upper mold 465 continues, the side wall 491 of the first horizontal mold 490 and the side wall 496 of the second horizontal mold 495 become closer, and the side walls 491 and 496 of the first and second horizontal molds 490 and 495 The space generated between the outer surface portion of 470 is reduced. As a result, the curved portion disappears, and the material of the overhang portion 415 flows to the connecting wall 406 and the side wall 404 of the blank 400, causing an increase in the cross-sectional thickness of the planned thickening portion 412 (see FIG. 31).

  At this time, since the overhang portion 415 is disposed on the side wall 404, the side wall of the press-formed product can be efficiently increased in thickness. The mold clearance between the extension 493 of the first lateral mold 490 and the blank connecting wall 406 is set so as to allow the material to flow and increase in thickness, so that the material of the overhanging part 415 is smooth. Inflow, the connecting wall of the press-formed product is efficiently increased in thickness.

  A through hole 418 is located at the edge of the thickening planned portion 412 of the connecting wall 406. The through hole 418 inhibits the transmission of the compressive stress, thereby suppressing the flow from the thickening scheduled portion 412 to the non-scheduled thickening portion, thereby improving the thickness increasing efficiency of the connecting wall of the press-formed product.

  As described above, in the fourth embodiment, similarly to the first embodiment, it is possible to reduce the weight of the press-formed product and reduce the manufacturing cost. Moreover, since the circumferential length extension site | part in Embodiment 4 is comprised from the overhang | projection part arrange | positioned at the side wall of a blank, it is possible to increase the thickness of the side wall of a press-molded product efficiently especially.

  In addition, it is also possible to arrange | position an overhang | projection part to an end surface of a blank, or to arrange | position only to one side surface. It is also possible to arrange a plurality of overhang portions with a gap in the extending direction of the blank. In this case, the press-formed product has partial thickening portions that are arranged with an interval in the extending direction.

  When the local site that requires rigidity or strength is small, it is preferable that the partially thickened portion of the press-molded product occupies only a part of the circumferential region by adjusting the shape of the overhang portion and the mold clearance. For example, it is possible to efficiently reduce the weight of the press-molded product by reducing the overhang and forming the partially thickened part only on a part of the connecting wall of the press-molded product (implementation). (See Modifications 1 to 3 of Form 1).

  Next, a fifth embodiment will be described.

  FIG. 32 is a perspective view for explaining a slit included in the blank according to the fifth embodiment, and FIG. 33 is a perspective view for explaining a press molding process according to the fifth embodiment.

  The fifth embodiment is generally different from the first embodiment in which the restraining means is constituted by the through-hole 118 in that the restraining means that suppresses the flow of the material is constituted by the slit 518. The press-molded product manufacturing apparatus according to the fifth embodiment is substantially the same as the press-molded product manufacturing apparatus according to the first embodiment, and therefore description thereof will not be repeated.

  The slit 518 is disposed at the edge of the planned thickness increase portion 512 of the blank 500 and extends the side wall 504 and the connecting wall 506, and can inhibit the transmission of compressive stress via the side wall 504 and the connecting wall 506. It is. An extension portion 514 that constitutes a circumferential extension portion is disposed at the edge 502 of the circumferential region that includes the planned thickening portion 512, and a cross-sectional circumference of the circumferential region that includes the planned thickening portion 512. The length is longer than the cross-sectional circumferential length of the circumferential region including the thickening non-scheduled portion 516.

  Therefore, in the press molding process, the extension portion 514 of the blank 500 is pressed toward the step portion of the lower mold, whereby the extension portion 514 is deformed and the material flows upward. At this time, the extension portion 514 is located at the edge 502 of the circumferential region including the thickening planned portion 512, and the mold clearance is set in consideration of the thickening due to the flow of the material. The flow of the material 514 causes an increase in the cross-sectional thickness of the planned thickening portion 512.

  On the other hand, a slit 518 is located at the edge of the thickening scheduled portion 512. The slit 518 inhibits the flow from the thickening scheduled portion 512 to the unthickened planned portion 516 by inhibiting the transmission of compressive stress (see FIG. 33). Since the slit 518 extends the side wall 504 and the connection wall 506, the material flow through the side wall 504 is suppressed in addition to the material flow through the connection wall 506. That is, the material dispersed via the side wall 504 also flows into the connecting wall 506. Therefore, it is possible to further improve the effect of increasing the thickness of the connecting wall of the press-formed product.

  As described above, in the fifth embodiment, the slits are arranged in the side wall and the connection wall, and in addition to the material flow through the connection wall, the material flow through the side wall is also suppressed. It is possible to improve the effect of increasing the thickness of the connecting wall of the press-formed product as compared with the above.

  In addition, it is preferable from the point of productivity and cost to form a slit by stamping, when preforming a blank from a rolled rolled material. However, the slit can be formed separately by machining. The width and length of the slit are preferably set as appropriate according to the size and shape of the blank thickening constant part and the partial thickening part of the press-formed product.

  Moreover, it is also preferable to arrange | position a slit so that it may be located in the fixed surface of a partial thickening part and another component. In this case, since another component functions as a reinforcing material, it is possible to suppress the influence of the slit on the rigidity of the press-formed product. If necessary, the slits can be joined by welding or the like to ensure rigidity. Furthermore, it is also possible to arrange the slit only on one of the side wall and the connecting wall, or on only one of the side walls.

  Next, a sixth embodiment will be described.

  FIG. 34 is a perspective view for explaining the blank according to the sixth embodiment, and FIG. 35 is a cross-sectional view for explaining the recess shown in FIG.

  The sixth embodiment is generally different from the fifth embodiment configured by the slit 518 in that the suppression means for suppressing the flow of the material is configured by the recess 618. The press-molded product manufacturing apparatus according to the sixth embodiment is substantially the same as the press-molded product manufacturing apparatus according to the first embodiment, and therefore description thereof will not be repeated.

  The concave portion 618 is formed of a thin portion, and is disposed on the inner surface of the edge portion of the planned thickness increase portion 612 of the blank 600 and extends the side wall 604 and the connecting wall 606, and therefore compressive stress via the side wall 604 and the connecting wall 606. Can be inhibited. The recess 618 is preferable in that it has less influence on the rigidity than the slit 518. An extension portion 614 that constitutes a circumferential extension portion is disposed at the edge 602 of the circumferential region that includes the planned thickening portion 612, and a cross-sectional circumference of the circumferential region that includes the planned thickening portion 612. The length is longer than the cross-sectional circumferential length of the circumferential region including the unthickened portion 616.

  Therefore, in the press molding process, the extension portion 614 of the blank 600 is pressed toward the step portion of the lower mold, whereby the extension portion 614 is deformed, and the material flows upward. At this time, the extension portion 614 is located at the edge 602 of the circumferential region including the thickening planned portion 612, and the mold clearance is set in consideration of the thickening due to the flow of the material. The flow of the material 614 causes an increase in the cross-sectional thickness of the planned thickness increase portion 612.

  On the other hand, a recess 618 is located at the edge of the thickening scheduled portion 612. The concave portion 618 suppresses the flow from the thickening scheduled portion 612 to the non-thickening planned portion 616 by inhibiting the transmission of compressive stress. Since the recess 618 extends the side wall 604 and the connection wall 606, the material flow through the side wall 604 is suppressed in addition to the material flow through the connection wall 606.

  That is, since the material dispersed via the side wall 604 also flows into the connecting wall 606, the effect of increasing the thickness of the connecting wall of the press-formed product can be further improved. In addition, since the recessed part 618 shrink | contracts by the material flow from the connection wall 606, the recessed part 638 which remains in the partial thickening part 632 of a press molded product becomes small compared with the recessed part 618 of the blank 600. FIG.

  36 to 37 are cross-sectional views for explaining the first to third modifications according to the sixth embodiment, and show the recesses before and after press molding.

  By forming a recess in the inner surface portion of the upper mold opposite to the planned thickness increase portion 612 of the blank 600 and increasing the clearance between the planned thickness increase portion 612 and the inner surface portion of the upper mold, the flow and increase of the material can be achieved. It is possible to enlarge the space that allows the meat with respect to the upper portion of the planned thickening portion 612. In this case, a partially thickened portion 632 whose upper surface is thickened is obtained (see FIG. 36). Reference numeral 636 represents a non-thickened portion.

  Further, a concave portion is formed in the inner surface portion of the lower mold facing the thickening planned portion 612, and the clearance between the planned thickening portion 612 and the inner surface portion of the lower mold is increased, so that the flow of the material and the thickening are increased. The space to be allowed can be enlarged with respect to the lower side of the thickening scheduled portion 612. In this case, a partially thickened portion 632 whose bottom surface is thickened is obtained (see FIG. 37).

  Further, a concave portion is formed in the inner surface portion of the upper mold and the lower mold facing the thickening planned portion 612, and the clearance between the thickening planned portion 612 and the inner surface portion of the upper mold and the thickening planned portion 612 and the lower mold are By increasing the clearance with the inner surface portion, it is possible to expand the space allowing the material to flow and increase the thickness with respect to the upper portion and the lower portion of the planned increase portion 612. In this case, a partially thickened portion 632 having thickened upper and lower surfaces is obtained (see FIG. 38).

  FIG. 39 is a cross-sectional view for explaining a fourth modification according to the sixth embodiment, and shows recesses before and after press molding.

  In the target press-molded product, when the remaining of the concave portion 618 is not preferable, it can be dealt with by adjusting the shape of the concave portion 618. For example, when the concave portion 618 is formed shallow, the concave portion 618 is eliminated by the material inflow from the connecting wall 606, and the partial thickened portion 632 of the press-molded product can be prevented from having the concave portion 638.

  As described above, since the recess according to the sixth embodiment has less influence on the rigidity than the slit according to the fifth embodiment, it is easier to ensure the rigidity of the press-formed product than in the fifth embodiment. .

  In addition, it is preferable from the point of productivity and cost to form a recessed part by press molding, when preforming a blank from a rolled material. However, the recesses can be formed separately by machining, or when casting is applied to the blank, the recesses can be formed collectively at the time of casting. The width and length of the recess are preferably set as appropriate in accordance with the size and shape of the blank thickening scheduled portion and the partially thickened portion of the press-formed product.

  Moreover, it is also preferable to arrange | position a recessed part so that it may be located in the fixed surface of a partial thickening part and another component. In this case, since another component functions as a reinforcing material, it is possible to suppress the influence of the concave portion on the rigidity of the press-formed product. Furthermore, it is also possible to arrange | position a recessed part to the outer surface of a blank, to arrange | position to only one of a side wall and a connection wall, or to arrange | position to only one of a side wall. It is also possible to arrange a plurality of recesses with a gap in the circumferential direction.

  Next, a seventh embodiment will be described.

  FIG. 40 is a perspective view for explaining the blank according to Embodiment 7, and FIG. 41 is a cross-sectional view for explaining the bent portion shown in FIG.

  The seventh embodiment is generally different from the sixth embodiment in which the restraining means is constituted by the concave portion 638 in that the restraining means for suppressing the material flow is constituted by the bent portion 718. The press-molded product manufacturing apparatus according to the seventh embodiment is substantially the same as the press-molded product manufacturing apparatus according to the first embodiment, and therefore description thereof will not be repeated.

  The bent portion 718 is disposed on the outer surface of the edge of the planned thickness increase portion 712 of the blank 700, extends the side wall 704 and the connecting wall 706, and inhibits transmission of compressive stress via the side wall 704 and the connecting wall 706. It is possible. The bent portion 718 is preferable in that it has less influence on rigidity compared to the concave portion 618 formed of a thin portion. The cross-sectional shape of the bent portion 718 is not particularly limited, but it is preferable to eliminate (or reduce) the residual marks in the press-formed product by making the shape easy to deform, for example, a gentle arc shape.

  An extension portion 714 that constitutes a circumferential extension portion is disposed at the edge 702 of the circumferential region that includes the planned thickening portion 712, and the cross-sectional circumference of the circumferential region that includes the planned thickening portion 712 The length is longer than the cross-sectional circumferential length of the circumferential region including the unthickened portion 716.

  Therefore, in the press molding process, the extension portion 714 of the blank 700 is pressed toward the step portion of the lower mold, whereby the extension portion 714 is deformed and the material flows upward. At this time, the extension portion 714 is located at the edge portion 702 of the circumferential region including the planned increase in thickness 712, and the mold clearance is set in consideration of the increase in thickness due to material flow. The flow of the material 714 causes an increase in the cross-sectional thickness of the planned thickness increase portion 712.

  On the other hand, a bent portion 718 is located at the edge of the thickening scheduled portion 712. The bent part 718 inhibits the flow from the thickening scheduled part 712 to the unthickened part 716 by inhibiting the transmission of compressive stress. Since the bent portion 718 extends the side wall 704 and the connection wall 706, in addition to the material flow through the connection wall 706, the material flow through the side wall 704 is also suppressed.

  That is, since the material dispersed via the side wall 704 also flows into the connection wall 706, the effect of increasing the thickness of the connection wall of the press-formed product can be further improved. The bent portion 718 is deformed by being pressed by the upper mold and the lower mold and disappears (or shrinks).

  42 to 43 are cross-sectional views for explaining modified examples 1 to 3 according to the seventh embodiment, and show a bent portion after press molding.

  By forming a recess in the inner surface portion of the upper mold that faces the planned increase in thickness 712 of the blank 700 and increasing the clearance between the planned increase in thickness portion 712 and the inner surface portion of the upper mold, the flow and increase of the material can be achieved. It is possible to enlarge the space that allows the meat with respect to the upper portion of the planned thickening portion 712. In this case, a partially thickened portion 732 whose upper surface is thickened is obtained (see FIG. 42). Reference numeral 736 indicates a non-thickened portion.

  Further, a concave portion is formed in the inner surface portion of the lower mold facing the thickening scheduled portion 712, and the clearance between the planned thickening portion 712 and the inner surface portion of the lower mold is increased, so that the flow of the material and the thickening are increased. The space to be allowed can be enlarged with respect to the lower portion of the planned thickening portion 712. In this case, a partially thickened portion 732 whose bottom surface is thickened is obtained (see FIG. 43).

  Further, a recess is formed in the inner surface portion of the upper mold and the lower mold facing the thickening planned portion 712, and the clearance between the thickening planned portion 712 and the inner surface portion of the upper mold and the planned thickening portion 712 and the lower mold are formed. By increasing the clearance with the inner surface portion, it is possible to expand the space allowing the material to flow and increase the thickness with respect to the upper portion and the lower portion of the planned increase portion 612. In this case, a partially thickened portion 732 having a thickened upper surface and lower surface is obtained (see FIG. 44).

  As described above, the bent portion according to the seventh embodiment has less influence on the rigidity than the concave portion according to the sixth embodiment, so that it is easier to ensure the rigidity of the press-formed product than the sixth embodiment. is there.

  In addition, it is preferable in terms of productivity and cost that the bent portion is formed by press forming when a blank is preformed from the rolled material. However, when casting is applied to the blank, it is possible to collectively form a bent portion during casting. The size and length of the bent portion are preferably set as appropriate according to the size and shape of the blank thickening scheduled portion and the partial thickening portion of the press-formed product.

  Moreover, it is also possible to arrange | position a bending part to the inner surface of a blank, to arrange | position only to one side wall and a connection wall, or to arrange | position only to one side wall. Furthermore, it is also possible to arrange a plurality of bent portions at intervals in the circumferential direction.

  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 suppressing means for suppressing the flow of the material is not particularly limited to a through hole, a slit, a concave portion, and a bent portion as long as it has a structure that inhibits the transmission of compressive stress.

  In addition, the first to third modifications according to the first embodiment are applied to the second to fourth embodiments, the second embodiment is applied to the third to fourth embodiments, or the fifth to seventh embodiments are applied. It is also possible to apply to Embodiments 1 to 4, or to apply Modifications 1 to 3 according to Embodiment 6 to Embodiments 1 to 5.

  The press-formed product is not limited to a form applied to a suspension component, and can be applied to other vehicle structural members. Other structural members for vehicles are frame main parts, such as link parts, bracket parts, side sill outer reinforcement, and ladder members, for example.

  Furthermore, the side wall and the connecting wall of the blank and the press-formed product are not limited to a substantially planar shape, and may have a curved shape or a bent shape. Further, the present invention can also be applied to angle-shaped blanks and press-molded products in which the ends of the side walls are connected to each other and do not have a connecting wall. Furthermore, it is also possible to apply a site to which another structural member is welded as a local site requiring rigidity or strength.

3 is a perspective view for explaining a press-formed product according to Embodiment 1. FIG. It is sectional drawing for demonstrating the partial thickening part of a press molded product. It is sectional drawing for demonstrating the non-thickening part adjacent to a partial thickening part. It is a top view for demonstrating the suspension components to which the press molded product which concerns on Embodiment 1 is applied. It is sectional drawing regarding line VV of FIG. It is a perspective view for demonstrating the blank which concerns on Embodiment 1. FIG. FIG. 3 is a cross-sectional view for explaining the device for manufacturing a press-formed product according to Embodiment 1. It is sectional drawing regarding line VIII-VIII of FIG. It is a perspective view for demonstrating the lower mold | type shown by FIG. 6 is a cross-sectional view for explaining a process of forming a partially thickened portion in the method for manufacturing a press-formed product according to Embodiment 1. FIG. It is sectional drawing which shows the pushing process of the extension part of the blank shown by FIG. It is sectional drawing for demonstrating the formation process of the non-thickening part adjacent to a partial thickening part. FIG. 6 is a cross-sectional view for explaining a first modification according to the first embodiment. FIG. 10 is a cross-sectional view for explaining a second modification according to the first embodiment. FIG. 10 is a cross-sectional view for explaining a third modification according to the first embodiment. 6 is an exploded view for explaining a press-formed product manufacturing apparatus according to Embodiment 2. FIG. It is a perspective view for demonstrating the lower mold | type shown by FIG. FIG. 17 is a cross-sectional view for explaining the method for manufacturing a press-formed product according to Embodiment 2, and shows the lowering of the upper mold shown in FIG. 16. FIG. 19 is a cross-sectional view for explaining the contact between the upper mold and the pin member of the restraining mechanism, following FIG. 18. It is sectional drawing for demonstrating the curved part formed in the connection wall of a blank following FIG. It is sectional drawing for demonstrating the flat part formed in a curved part following FIG. FIG. 22 is a cross-sectional view for explaining the disappearance of the bending portion, following FIG. 21. It is a perspective view for demonstrating the blank which concerns on Embodiment 3. FIG. FIG. 6 is a cross-sectional view for explaining a device for manufacturing a press-formed product according to Embodiment 3. It is a perspective view for demonstrating the lower mold | type shown by FIG. FIG. 10 is a perspective view for explaining a modification of the third embodiment. It is a perspective view for demonstrating the blank which concerns on Embodiment 4. FIG. FIG. 10 is an exploded view for explaining a device for manufacturing a press-formed product according to Embodiment 4. It is sectional drawing for demonstrating the manufacturing method of the press-formed product which concerns on Embodiment 4, and has shown the fall of the upper mold | type shown by FIG. It is sectional drawing for demonstrating the curved part formed in the side wall of a blank following FIG. FIG. 31 is a cross-sectional view for explaining the disappearance of the bending portion, following FIG. 30. It is a perspective view for demonstrating the slit which the blank concerning Embodiment 5 has. FIG. 10 is a perspective view for explaining a press molding process according to a fifth embodiment. It is a perspective view for demonstrating the blank which concerns on Embodiment 6. FIG. It is sectional drawing for demonstrating the recessed part shown by FIG. It is sectional drawing for demonstrating the modification 1 which concerns on Embodiment 6, and has shown the recessed part before and behind press molding. It is sectional drawing for demonstrating the modification 2 which concerns on Embodiment 6, and has shown the recessed part before and behind press molding. It is sectional drawing for demonstrating the modification 3 which concerns on Embodiment 6, and has shown the recessed part before and behind press molding. It is sectional drawing for demonstrating the modification 4 which concerns on Embodiment 6, and has shown the recessed part before and behind press molding. It is a perspective view for demonstrating the blank which concerns on Embodiment 7. FIG. It is sectional drawing for demonstrating the bending part shown by FIG. It is sectional drawing for demonstrating the modification 1 which concerns on Embodiment 7, and has shown the bending part after press molding. It is sectional drawing for demonstrating the modification 2 which concerns on Embodiment 7, and has shown the bending part after press molding. It is sectional drawing for demonstrating the modification 3 which concerns on Embodiment 7, and has shown the bending part after press molding.

Explanation of symbols

100, blank,
102 .. edge
104 .. side wall,
106 .. Connecting wall,
108 .. End face,
112 .. Thickening planned part,
114 .. Extension part,
116 .. Unscheduled part (peripheral part),
118 .. Through hole,
120..Press molded products,
122 .. Edge
124 .. side wall,
126 .. Connecting wall,
132 .. Partially thickened part,
136 .. Non-thickened part,
138 .. Through hole,
140 .. Suspension parts,
142 .. Upper side member,
144 .. Lower side member,
146, 147 ... Bracket,
148, nuts,
149 .. hole
150 .. Equipment for manufacturing press-formed products,
160 .. Upper mold (die part),
170 .. Lower mold (punch part),
172 .. Stepped part,
180 ・ ・ Side type,
200 ... Blank,
206 .. Connecting wall,
214 .. Extension part,
218 .. Through hole,
250 .. Press-molded product manufacturing equipment,
254 ... the base,
260 .. Upper mold (die part),
270 .. Lower mold (punch part),
272 .. Stepped part,
291 .. Insertion hole,
292 ... Pad part
293 ... Stopper,
294-Spring mechanism,
295 .. Support member,
296 .. Base,
297 .. Shaft part,
298 .. Pin member,
300 ... Blank,
302 .. Edge
304 .. side wall,
306 .. Connecting wall,
308 .. end face,
312 .... Thickening planned part,
315 .. Overhang part,
318 .. through hole,
350 .... Press-molded product manufacturing equipment,
360 .. Upper mold (die part),
370 .. Lower mold (punch part),
372 .. Stepped part,
380 ... Side type,
400 ... Blank,
402 .. Edge
404 .. side wall,
406 .. Connecting wall,
412 ··· Thickening planned part,
415 .. Overhang part,
418 .. Through hole,
450 .... Press-molded product manufacturing equipment,
460 ... Upper mold (die part),
465 .. Upper type (second division type),
466,467 ・ ・ Slope,
470 .. Lower mold (punch part),
472 .. Stepped part,
490 .. First lateral type (first division type),
491 .. side wall,
492 ... Slope,
493 ... Extension part
495 .. 2nd horizontal type (1st division type),
496 .. side wall,
497..Slope,
500 ... Blank,
502 .. Edge
504 .. side wall,
506 .. Connecting wall,
512 .. Thickening planned part,
514 .. Extension part,
516 .. Unexpected thickness increase (peripheral part),
518..Slit,
600 ... Blank,
602 ... the edge,
604 .. side wall,
606 ... Connection wall,
612 ... thickening planned part,
614 .. Extension,
616 ... Unscheduled part (peripheral part),
618 .. Recess,
632 .. Partially thickened part,
636 .. Non-thickened part,
638 .. Recess,
700, blank,
702 ... the edge,
704 .. side wall,
706 .. Connecting wall,
712 ... Planned to increase meat,
714 .. Extension part,
716 .. Unscheduled part (peripheral part),
718 .. bent part,
732 .. Partially thickened part,
736 .. Non-thickened part,
a space
F. Flat part.

Claims (47)

From a blank having a suppression means to suppress the flow of the material, having a press molding process for obtaining a press molded product,
The press-molded product has a partially thickened portion arranged at a local site,
The blank has a thickening scheduled portion corresponding to the partial thickening portion,
The suppression means is disposed at an edge of the thickening scheduled portion,
In the press molding process,
The partially thickened portion is formed by pushing a part of the blank and generating a flow of material that causes an increase in cross-sectional thickness, and
The manufacturing method, wherein the flow of the material from the planned increase in thickness to the peripheral portion of the planned increase in thickness is suppressed by the suppression means.   The manufacturing method according to claim 1, wherein the suppression unit has a structure that inhibits transmission of compressive stress. The circumferential region including the planned thickening portion of the blank has a circumferential extension portion, and the circumferential length of the circumferential region includes the partial thickening portion of the press-formed product. It is longer than the cross-sectional circumference of the direction area,
The manufacturing method according to claim 1 or 2, wherein a part of the blank to be pushed in is the circumferential extension portion.   The said blank is shape | molded from the rolling material by press molding, The manufacturing method of Claim 3 characterized by the above-mentioned. The blank has a through-hole formed at an edge of the thickening scheduled portion,
The manufacturing method according to claim 3, wherein the suppressing unit is configured by the through hole. The circumferential region including the thickening planned portion of the blank corresponds to the circumferential region including the partial thickening portion of the press-formed product, and includes an edge, a side wall extending from the edge, and the side wall. Having a connecting wall to connect,
The manufacturing method according to claim 5, wherein the suppressing unit is disposed on at least one of the connecting wall and the side wall. The blank has a slit formed at an edge of the thickening scheduled portion,
The manufacturing method according to claim 3, wherein the suppressing unit includes the slit. The blank has a recess formed at an edge of the thickening scheduled portion,
The manufacturing method according to claim 3, wherein the suppressing unit is configured by the concave portion. The blank has a bent portion formed at an edge of the thickening scheduled portion,
The manufacturing method according to claim 3, wherein the suppressing unit includes the bent portion. The circumferential region including the thickening planned portion of the blank corresponds to the circumferential region including the partial thickening portion of the press-formed product, and includes an edge, a side wall extending from the edge, and the side wall. Having a connecting wall to connect,
The said suppression means is arrange | positioned at the said connection wall and the said side wall. The manufacturing method of any one of Claims 7-9 characterized by the above-mentioned.   The manufacturing method according to claim 4, wherein the circumferential length extension portion is configured by an extension portion arranged at an edge portion of a circumferential region of the blank. The circumferential region including the thickening planned portion of the blank corresponds to the circumferential region including the partial thickening portion of the press-formed product, and includes an edge, a side wall extending from the edge, and the side wall. Having a connecting wall to connect,
The manufacturing method according to claim 11, wherein buckling of the connection wall is suppressed by restraining the connection wall of the blank in the press forming step.   13. The manufacturing method according to claim 12, wherein in the press molding step, the restraining operation of the connecting wall of the blank is interlocked with the pushing operation of the extension portion of the blank. The circumferential region including the thickening planned portion of the blank corresponds to the circumferential region including the partial thickening portion of the press-formed product, and includes an edge, a side wall extending from the edge, and the side wall. Having a connecting wall to connect,
The manufacturing method according to claim 4, wherein the circumferential extension portion includes an extension portion arranged at the edge portion of the blank and an overhang portion arranged at the connection wall of the blank. .   The manufacturing method according to claim 4, wherein the circumferential extension portion is configured by an overhanging portion disposed in a circumferential region of the blank. The circumferential region including the thickening planned portion of the blank corresponds to the circumferential region including the partial thickening portion of the press-formed product, and includes an edge, a side wall extending from the edge, and the side wall. Having a connecting wall to connect,
The manufacturing method according to claim 15, wherein the overhang portion is disposed on the side wall of the blank.   The manufacturing of any one of claims 11 to 16, wherein in the press molding step, the flow of the material in the extension direction of the blank is stopped by stopping the movement of the end face of the blank. Method.   A press-formed product formed by the manufacturing method according to any one of claims 1 to 17, wherein the partial thickened portion is disposed at a local site where rigidity or strength is required. Press molded product.   The press-formed product according to claim 18, which is applied to a structural member for a vehicle.   The press-formed product according to claim 19, wherein the vehicle structural member is a suspension component.   The press-formed product according to any one of claims 18 to 20, further comprising another component fixed to the partial thickening portion.   The press-formed product according to claim 21, wherein the another part is a fastening means.   The press-formed product according to claim 22, wherein the fastening means is a bracket.   The press-formed product according to claim 22, wherein the fastening means is a nut.   The press-formed product according to any one of claims 21 to 24, wherein the another component is fixed by welding.   The press-formed product according to any one of claims 18 to 20, further comprising a hole formed in the partial thickening portion.   27. The press-formed product according to claim 26, wherein the hole is tapped. From a blank having suppression means for suppressing the flow of material, having a press mold for obtaining a press-molded product,
The press-molded product has a partially thickened portion arranged at a local site,
The blank has a thickening scheduled portion corresponding to the partial thickening portion,
The suppression means is disposed at an edge of the thickening scheduled portion,
The press mold is configured to form the partial thickened portion by pressing a part of the blank and generating a flow of a material that causes an increase in cross-sectional thickness; and
The manufacturing apparatus is characterized in that flow of the material from the planned increase in thickness to the peripheral portion of the planned increase in thickness is suppressed by the suppression means.   The manufacturing apparatus according to claim 28, wherein the suppressing means has a structure that inhibits transmission of compressive stress. The circumferential region including the planned thickening portion of the blank has a circumferential extension portion, and the circumferential length of the circumferential region includes the partial thickening portion of the press-formed product. It is longer than the cross-sectional circumference of the direction area,
30. The manufacturing apparatus according to claim 28 or 29, wherein a part of the blank to be pushed in is the circumferential extension portion.   The manufacturing apparatus according to claim 30, wherein the blank is formed from a rolled material by press forming. The blank has a through-hole formed at an edge of the thickening scheduled portion,
32. The manufacturing apparatus according to claim 30, wherein the suppressing unit is configured by the through hole. The circumferential region including the thickening planned portion of the blank corresponds to the circumferential region including the partial thickening portion of the press-formed product, and includes an edge, a side wall extending from the edge, and the side wall. Having a connecting wall to connect,
The manufacturing apparatus according to claim 32, wherein the suppressing means is disposed on at least one of the connecting wall and the side wall. The blank has a slit formed at an edge of the thickening scheduled portion,
32. The manufacturing apparatus according to claim 30 or claim 31, wherein the suppressing means includes the slit. The blank has a recess formed at an edge of the thickening scheduled portion,
32. The manufacturing apparatus according to claim 30 or claim 31, wherein the suppressing means includes the concave portion. The blank has a bent portion formed at a boundary between an edge of the planned increase in thickness and a peripheral portion of the planned increase in thickness;
32. The manufacturing apparatus according to claim 30 or 31, wherein the suppressing means is configured by the bent portion. The circumferential region including the thickening planned portion of the blank corresponds to the circumferential region including the partial thickening portion of the press-formed product, and includes an edge, a side wall extending from the edge, and the side wall. Having a connecting wall to connect,
The said suppression means is arrange | positioned at the said connection wall and the said side wall. The manufacturing apparatus of any one of Claims 34-36 characterized by the above-mentioned. The circumferential length extension portion is composed of an extension portion arranged at an edge of a circumferential region of the blank,
The press mold has a die part and a punch part that are clamped with the blank disposed therebetween,
The die portion has an inner surface portion corresponding to the outer surface shape of the press-formed product,
The punch portion has an outer surface portion corresponding to the inner surface shape of the press-formed product and a step portion extending along an edge of the arranged blank,
The extension portion of the blank is pressed against the step portion of the punch portion during mold clamping of the die portion and the punch portion, thereby causing a flow of material that causes an increase in the cross-sectional thickness. The production apparatus according to claim 31, wherein the production apparatus is generated. The circumferential region including the thickening planned portion of the blank corresponds to the circumferential region including the partial thickening portion of the press-formed product, and includes an edge, a side wall extending from the edge, and the side wall. Having a connecting wall to connect,
The said manufacturing apparatus has a restraining mechanism for suppressing the buckling of the said connection wall, The manufacturing apparatus of Claim 38 characterized by the above-mentioned. The restraint mechanism has an insertion hole arranged at the top of the punch part, and a pad part that is arranged so as to protrude from the insertion hole and is biased in a direction protruding from the insertion hole,
The urging force of the pad part is smaller than the clamping force of the punch part and the die part,
40. The manufacturing apparatus according to claim 39, wherein the connection wall of the blank is restrained by being supported by the pad portion protruding from the top of the punch portion.   The manufacturing method according to claim 40, wherein the restraining mechanism includes an interlocking mechanism for interlocking clamping of the punch part and the die part and restraining of the connecting wall of the blank by the pad part. apparatus.   The manufacturing apparatus according to claim 41, wherein the interlocking mechanism maintains a constant space generated between the punch portion and the die portion. The circumferential region including the thickening planned portion of the blank corresponds to the circumferential region including the partial thickening portion of the press-formed product, and includes an edge, a side wall extending from the edge, and the side wall. Having a connecting wall to connect,
The circumferential extension portion is composed of an extension portion arranged at the edge portion of the blank and an overhang portion arranged at the connection wall of the blank,
The press mold has a die part and a punch part that are clamped with the blank disposed therebetween,
The die portion has an inner surface portion corresponding to the outer surface shape of the press-formed product,
The punch portion has an outer surface portion corresponding to the inner surface shape of the press-formed product and a step portion extending along an edge of the arranged blank,
The extension portion and the overhang portion of the blank are pushed in contact with the step portion of the punch portion and the inner surface portion of the die portion when clamping the die portion and the punch portion. 32. The manufacturing apparatus according to claim 31, wherein a flow of a material causing an increase in the cross-sectional thickness is generated. The circumferential extension site is composed of an overhang portion arranged in a circumferential region of the blank,
The press mold has a die part and a punch part that are clamped with the blank disposed therebetween,
The die portion has an inner surface portion corresponding to the outer surface shape of the press-formed product,
The punch portion has an outer surface portion corresponding to the inner surface shape of the press-formed product,
The projecting part of the blank is pressed against the inner surface part of the die part during mold clamping of the die part and the punch part, thereby causing a flow of material that causes an increase in the cross-sectional thickness. 32. The manufacturing apparatus according to claim 31, wherein the manufacturing apparatus is generated. The circumferential region including the thickening planned portion of the blank corresponds to the circumferential region including the partial thickening portion of the press-formed product, and includes an edge, a side wall extending from the edge, and the side wall. Having a connecting wall to connect,
The overhang is disposed on the side wall of the blank;
The die portion has a plurality of divided types,
The plurality of split molds include a first split mold facing the overhang portion,
The manufacturing apparatus according to claim 44, wherein the first split mold abuts on the overhang portion and pushes in the overhang portion. The plurality of split molds include a second split mold for exerting a clamping force of the punch part and the die part,
The second split mold is opposed to the punch portion via the first split mold.
The said manufacturing apparatus has an interlocking mechanism for interlocking the proximity | contact with respect to the said punch part of the said 2nd division | segmentation type | mold, and the contact | abutting with respect to the said overhang | projection part of the said 1st division | segmentation type | mold. Manufacturing equipment. A blocking means for blocking the flow of material in the direction of extension of the blank;
The said prevention means has a side type | mold which is arrange | positioned at the side of the said die part and the said punch part, and opposes the end surface of the said blank. The any one of Claims 38-46 characterized by the above-mentioned. Manufacturing equipment.

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