JP2012254483A - Press-molded product, and method and device for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the weight and manufacturing cost of a press-molded product.SOLUTION: The long press-molded product 120 having a hat-shaped cross-section includes a pair of sidewall portions 124 separated from each other and a connecting wall portion 126 connecting the respective ends of the sidewall portions 124. The plate thickness of the sidewall portions 124 and the connecting wall portion 126 in a portion 132 in the length direction is increased by press-molding to more than those of the sidewall portions 124 and the connecting wall portion 126 in a peripheral portion 136 of the portion 132.

Description

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

Press-molded products such as vehicle suspension parts are manufactured from tailored blanks (
For example, see 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.

The uniform phase of the present invention for achieving the above object is a method of manufacturing a part having a hat-shaped cross section by press molding, and the method includes a preparation step, an arrangement step, a bending step, and a thickening step. Have In the preparing step, a preform having a hat-shaped cross section having a pair of spaced apart side wall portions and a connecting wall portion that connects the end portions of the side wall portions is prepared. In the placement step, the preform is placed in the mold. In the bending step, at least one of the connecting wall portion and the side wall portion is bent in the gap in the mold by pressing the preform with the mold during the mold clamping operation of the mold. In the thickening step, in a state where at least one of the connecting wall portion and the side wall portion is bent, the bent portion is sandwiched by a molding die, and the other of the connecting wall portion and the side wall portion is connected to the other of the hat-shaped cross sections. From both sides in the length direction of the wall,
By compressing with a shaping | molding die, the plate | board thickness of both a side wall part and a connection wall part is made to increase.

Another aspect of the present invention for achieving the above object is a long press having a hat-shaped cross section having a pair of spaced apart side wall portions and a connecting wall portion connecting the end portions of the side wall portions. It is a molded product. In the press-formed product, the plate thickness of the side wall portion and the connecting wall portion in a part in the longitudinal direction is increased by the press forming from the thickness of the side wall portion and the connecting wall portion in the peripheral portion of the part.

Still another aspect of the present invention for achieving the above object is an apparatus for manufacturing a part having a hat-shaped cross section by press molding, and a pair of spaced apart side wall portions and end portions of the side wall portions are connected to each other. A preform having a hat-shaped cross section having a connecting wall portion to be connected has a forming die that is placed and clamped. The molding die includes a punch portion disposed inside the preform, and a die portion that presses the outer surface of the preform toward the punch portion by relative movement with the punch portion. The cross-sectional thickness of the cavity formed by the punch portion and the die portion at the time of mold clamping is set to be larger than the plate thickness of the preform. The punch part and the die part press the preform in the middle of the mold clamping operation, bend at least one of the connecting wall part and the side wall part with a gap in the molding die, and at least one of the connecting wall part and the side wall part. In a state where the bent portion is sandwiched, the other of the connecting wall portion and the side wall portion is compressed from both sides in the lengthwise direction of the other wall portion in the hat-shaped cross section, and thereby the side wall portion and Increase the thickness of both of the connecting walls.

According to the one aspect of the present invention, a press-formed product (part) having a portion in which the thickness of both the side wall portion and the connecting wall portion is increased is manufactured. Therefore, even when a thin preform is applied, the rigidity or strength of the press-formed product is ensured by the portion where the plate thickness is increased, and thus it is possible to easily reduce the weight of the press-formed product. Further, since the portion where the plate thickness is increased is formed by press molding having good productivity as compared with the tailored blank to which butt welding is applied, the manufacturing cost is reduced. Therefore, it is possible to reduce the weight of the press-formed product and reduce the manufacturing cost.

According to another uniform aspect of the present invention, the thickness of both the side wall portion and the connecting wall portion is increased in a part in the longitudinal direction of the press-formed product. Therefore, even if the peripheral portion of the part is thin, the part having the increased thickness secures the rigidity or strength of the press-formed product, so that the press-formed product can be easily reduced in weight. Is possible. Moreover, since the said part where the plate | board thickness is increasing is formed by the 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.

According to still another aspect of the present invention, a portion in which the thickness of both the side wall portion and the connecting wall portion is increased by press-molding the preform with a molding die including a punch portion and a die portion. It is possible to manufacture a press-formed product (part) having the same. Therefore, even when a thin preform is applied, the rigidity or strength of the press-formed product is ensured by the portion where the plate thickness is increased, and thus it is possible to easily reduce the weight of the press-formed product. Further, since the portion where the plate thickness is increased is formed by press molding having good productivity as compared with the tailored blank to which butt welding is applied, the 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 (component) 120 according to Embodiment 1 is a substantially polygonal long object having an open cross section, has a hat-shaped cross section, and extends in one direction (longitudinal direction). The press-molded product 120 is
A pair of side walls 124 that are spaced apart from each other, and a connecting wall 126 that connects the ends of the side walls 124 together.
It is obtained by press-molding a plate-shaped blank. The length (the length along the longitudinal direction) of the press-formed product 120 is larger than the total length of the part (height) corresponding to the side wall part 124 and the part (width) corresponding to the connecting wall part 126 in the open cross section. .

The press-formed product 120 has a partially thickened portion (a part in the longitudinal direction) 132 disposed at a local site where rigidity or strength is required. In addition, the corner part located between the side wall part 124 and the connection wall part 126 and connecting the side wall part 124 and the connection wall part 126 has an arc shape. Reference numeral 1
Reference numeral 22 denotes an edge of the side wall 124.

The partially thickened portion 132 extends in the circumferential direction intersecting the longitudinal direction of the press-formed product 120, and the side wall portion 124 and the connecting wall portion 126 of the partially thickened portion 132 are the side wall portions 1 of the non-thickened portion 136.
Compared with 24 and the connection wall part 126, the plate | board thickness is increasing. The increase in sheet thickness is caused by the material flow generated by pressing a part of the blank during press forming.

Therefore, even if a thin plate-shaped blank is applied, the partial thickened portion 132 where the plate thickness is increased.
As a result, rigidity or strength is ensured, so that the weight of the press-formed product 120 can be reduced. Moreover, since the partial thickness increase part 132 is formed by press molding which has favorable productivity compared with the tailored blank to which butt welding is applied, the press molded product 120
The manufacturing cost is reduced. The hardness of the partially thickened portion 132 is larger than the hardness of the non-thickened portion 136 due to work hardening (compressive stress) by press molding.

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. Upper side member 142
The lower side member 144 is a substantially polygonal long object 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.

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, the partially thickened portion 132 of the press-formed product 120.
Since the bracket 146 is fixed to the bracket, it is possible to ensure good fixing strength. 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.

6 is a perspective view for explaining the blank according to the first embodiment, and FIG. 7 is a first embodiment.
Sectional drawing for demonstrating the manufacturing apparatus of the press molded product which concerns on FIG. 8, FIG. 8 is the line VIII-V of FIG.
FIG. 9 is a perspective view for explaining the lower mold shown in FIG. 7.

The manufacturing apparatus according to Embodiment 1 has a press mold for obtaining a press-formed product 120 from the plate-like blank 100. The press mold is to push a part of the blank 100,
The partial thickening portion 132 can be formed by generating a material flow that causes an increase in the plate thickness.

More specifically, a blank (preliminary molded product) 100 that is put into the manufacturing apparatus according to the first embodiment.
Is a long preform with an open cross-section formed by press-molding a rolled material, the shape of which corresponds to the shape of the press-formed product 120, and a pair of spaced apart side wall portions 104,
And a connecting wall portion 106 that connects the end portions of the side wall portion 104. In addition, the corner part which is located between the side wall part 104 and the connection wall part 106, and connects the side wall part 104 and the connection wall part 106,
It is arcuate.

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. Longer than the cross-sectional circumference of the region,
A part of the blank 100 to be pushed in is a circumferential extension site. Therefore, it is possible to easily generate a material flow that causes an increase in plate thickness.

The peripheral extension portion according to the first embodiment is the end surface of the edge portion 102 of the side wall portion 104 (the side wall portion 104).
And an extended portion (projecting portion) 114 formed so as to project from the end surface. The extension 114 can be formed at a low cost by punching a rolled material, which is preferable. However, the extension 114 can also be formed by machining. In the first embodiment, the cross-sectional circumferential length of the circumferential region including the thickening scheduled portion 112 is longer than the cross-sectional circumferential length of the circumferential region including the thickening non-planned portion 116.

The press mold includes an upper die (die portion) 160 and a lower die (punch portion) 170 that are arranged close to and away from each other, and a side die 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 mold is clamped. Blank 10 on the molding surface of upper mold 160 and lower mold 170
The portion corresponding to the corner portion between the zero side wall portion 104 and the connecting wall portion 106 has an arcuate cross section in consideration of material flow. The part of the arc-shaped cross section in the upper mold 160 constitutes a guide means that bends the connecting wall portion 106 by guiding the corner portion toward the connecting wall portion.

The lower mold 170 has a stepped portion (contact surface) 172 extending 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 the plate thickness. .

The cross-sectional thickness of the cavity formed by the upper mold 160 and the lower mold 170 corresponding to the circumferential region including the planned thickening portion 112 of the blank 100 is determined in consideration of the thickening due to material flow.
Is set. That is, the cross-sectional thickness of the cavity at the time of mold clamping is set larger than the plate thickness of the blank 100 so as to allow material flow.

The side mold 180 is positioned so as to contact both end faces 108 in the longitudinal direction of the blank 100, and is disposed on the side of the upper mold 160 and the lower mold 170. The side mold 180 is a restraining means for restraining the material flow in the longitudinal direction of the blank 100 by restraining the movement of the end face 108 of the blank 100 when the mold is clamped and press-molded.

  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 includes a press molding step for obtaining the press molded product 120 from the plate-like blank 100. The press molding process includes a preparation process for preparing the blank 100 and an upper mold 16.
An arrangement step of arranging the blank 100 between the 0 and the lower mold 170 (in the mold), and the upper mold 16
In the middle of the clamping operation of the 0 and the lower mold 170, the blank 100 is pressed by the upper mold 160 and the lower mold 170, thereby bending the connecting wall portion 106 with a gap in the molding die, and the connecting wall portion From the bent state of 106, the connecting wall portion 106 (the bent portion) is sandwiched between the upper die 160 and the lower die 170, and the side wall portion 104 is moved from both sides in the length direction of the side wall portion 104 to the upper die 160 and And compressing with the lower mold 170 to increase the thickness of both the side wall portion 104 and the connecting wall portion 106.

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 region including the unscheduled portion 116 has a shorter cross-sectional circumferential length than the circumferential region including the extension 114, the lower mold 17
It is separated from the zero step 172.

When the upper die 160 is lowered toward the lower die 170 for clamping and press forming, the inner surface portion of the upper die 160 comes into contact with the connecting wall portion 106 of the blank 100 arranged on the lower die 170. The clamping force of the upper mold 160 is such that the extension portion 114 of the blank 100 is changed to the step portion 1 of the lower mold 170.
In order to press toward 72, the extension 114 is deformed (see FIG. 11).

Along with the mold clamping operation, between the inner surface of the upper mold 160 and the top surface of the outer surface of the lower mold 170 (gap)
, There is a space that allows material flow, and in this space, the connecting wall portion 10 of the blank 100 is provided.
6 is located. That is, during the mold clamping, the gap between the connecting wall 106 and the lower mold 170 is set larger than the gap between the side wall 104 and the lower mold 170. Therefore, extension 1
14 material flows upward and is pushed.

At this time, the connecting wall 106 is brought into contact with the upper mold 160, and the end surface of the side wall 104 opposite to the connecting wall 106 is brought into contact with the step 172 of the lower mold 170. The side wall portion 104 is pressed by pressing the side wall portion 104 with the 172 and the upper mold 160.
The connecting wall portion 106 is bent by the pressing force acting on the connecting wall portion 106. That is, the side wall 104 is supported by the upper mold 160 and the lower mold 170 and the connecting wall 106 is pushed into the lower mold by the upper mold 160 so that the central portion of the connecting wall 106 is moved to the lower mold. Bend (a curved part is formed). At this time, the portion corresponding to the corner portion between the side wall portion 104 of the blank 100 and the connecting wall portion 106 on the molding surface of the upper mold 160 guides the corner portion to the connecting wall portion side. Therefore, the material inflow from the corner portion to the connecting wall portion can be promoted.

Thereafter, the connecting wall 106 is sandwiched by the upper mold 160 and the lower mold 170 from the bending direction, that is, the mold closing direction of the upper mold 160 and the lower mold 170 from the state in which the connecting wall section 106 is bent. The part 106 is compressed from the bending direction. At the same time, the side wall 104 is compressed from both sides in the longitudinal direction of the side wall 104 by the upper mold 160 and the lower mold 170, whereby the curved portion of the connecting wall 106 disappears, and the side wall 104 and the connecting wall 106. Increase both plate thicknesses. Thus, when increasing the plate thickness of both wall portions, in Embodiment 1, the connecting wall portion 106 is connected to the upper die 160 and the lower die 1 from both sides in the longitudinal direction of the cross section in FIG.
Although it cannot be compressed directly by 70, the connecting wall portion 106 can be fed to the connecting wall portion 106 side by bending the connecting wall portion 106, so that the material of the connecting wall portion 106 can be fed into the connecting wall portion 106. By compressing the connecting wall 106 from the mold closing direction with the material fed, the plate thickness of the connecting wall 106 can be effectively increased.

The extension 114 is located at the edge 102 of the circumferential region including the thickening planned portion 112, and the cavity cross-sectional thickness at the time of mold clamping considering the thickening due to material flow is set, The material flow of the extension part 114 causes an increase in the plate thickness of the planned thickness increase part 112 (FIG. 1).
0). Thereby, the partial thickening part 132 of the press molded product 120 is formed.

In addition, a lateral mold 180 is located on the side 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 114 is suppressed from flowing in the longitudinal direction of the blank 100, it mainly flows in the circumferential direction. That is, the plate thickness in the circumferential region increases efficiently.

On the other hand, the circumferential area including the non-thickened portion 116 of the blank 100 substantially coincides with the circumferential area including the non-thickened portion 136 of the press-formed product 120 and has an extension 114. Not. Therefore, it is not pushed in by the level | step-difference part 172 of the lower mold | type 170, the material flow which causes the increase in plate | board thickness does not generate | occur | produce, and plate | board thickness does not increase (refer FIG. 12). Thereby, the non-thickened portion 136 of the press-formed product 120 is formed.

  FIG. 13 is a chart for explaining the relationship between the indentation ratio and the press forming result.

The indentation ratio is the cross-sectional circumferential length of the circumferential region including the thickened portion 112 and the extension 114 in the blank 100, and the sectional circumferential length of the circumferential region including the partial thickened portion 132 in the press-formed product 120. And further divided by the circumferential length of the cross section of the circumferential region including the partially thickened portion 132.

Since the indentation ratio corresponds to the material flow rate, if the indentation ratio is set large, the effect of increasing the wall thickness is improved. However, as shown in FIG. 13, good formability is exhibited when the indentation ratio is 30%, but when it is 32%, buckling occurs in the connecting wall portion 126 of the partially thickened portion 132 of the press-formed product 120. To do.

That is, if the indentation ratio is set too large, the material excessively flows into the space generated between the inner surface portion of the upper die 160 and the top surface of the outer surface portion of the lower die 170 during press forming, and the blank 100
An excessively curved portion is formed in the connecting wall portion 106 of the second embodiment. Since the curved portion is not extended and does not disappear, it causes buckling. Therefore, in order to avoid the occurrence of buckling, the indentation ratio is 30%
The following is preferable.

  14-16 is sectional drawing for demonstrating the modifications 1-3 which concern on Embodiment 1. FIG.

When the local area that requires rigidity or strength is small, adjust the shape of the blank extension, the inner shape of the upper and lower dies, the cross-sectional thickness of the cavity when clamping, etc. It is also preferable that the thickened portion 132 occupies only a part of the circumferential region.

For example, as shown in FIG. 14, 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.
It is possible to abolish the reinforcing plate by disposing the partially thickened portion 132 at the site where the is attached by welding.

Furthermore, in order to fasten another part, as shown in FIG.
49 can also be formed. 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, the hole 149 is tapped and the nut 1
When used as an alternative to 48, the nut 148 can be eliminated.

As described above, according to the manufacturing method according to Embodiment 1, a press-formed product having a partially thickened portion in which the plate thicknesses of both the side wall portion and the connecting wall portion are increased. Therefore, even if a thin blank is applied, the partially thickened portion ensures the rigidity or strength of the press-molded product, so that it is possible to easily reduce the weight of the press-molded product. 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.

Further, according to the press-formed product according to the first embodiment, it has the partial thickened portion in which the plate thickness of both the side wall portion and the connecting wall portion is increased, and the partial thickened portion has rigidity or strength. It is placed at the necessary local site. Therefore, even if the peripheral portion of the partially thickened portion is thin, the partially thickened portion ensures the rigidity or strength of the press-molded product, so that it is possible to easily reduce the weight of the press-molded product. . Moreover, since the partial thickness increase part is formed by the press molding which has favorable productivity compared with the tailored blank to which butt welding is applied, manufacturing cost is reduced.

Moreover, according to the manufacturing apparatus which concerns on Embodiment 1, the plate | board thickness of both a side wall part and a connection wall part increases by press-molding a blank with the some shaping | molding die containing a lower mold | type and an upper mold | type. It is possible to produce a press-formed product having a partially thickened portion. for that reason,
Even if a thin blank is applied, the partially thickened portion ensures the rigidity or strength of the press-molded product, so that it is possible to easily reduce the weight of the press-molded product. Further, since the portion where the plate thickness is increased is formed by press molding having good productivity as compared with the tailored blank to which butt welding is applied, the manufacturing cost is reduced. Therefore, it is possible to reduce the weight of the press-formed product and reduce the manufacturing cost.

Therefore, Embodiment 1 can reduce the weight of the press-formed product and reduce the manufacturing cost.

Moreover, since the circumferential length extension site | part in Embodiment 1 is comprised from the extension part arrange | positioned at the edge part of the side wall part of a blank, it is especially possible to increase the thickness of the side wall part of a press-molded product efficiently. It is.

The hardness of the partially thickened portion is greater than the hardness of the non-thickened portion. This is because the hardness is increased by work hardening (compressive stress) by press molding.

The part of the molding surface of the upper mold corresponding to the corner portion of the blank has an arc-shaped cross section, and the corner portion of the blank is guided to the connecting wall portion side, so that the connecting wall portion is efficiently increased in thickness. Is possible.

The lateral mold prevents the material of the extension from flowing in the longitudinal direction of the blank and mainly flows in the circumferential direction, so that the plate thickness in the circumferential region can be efficiently increased.

In addition, it is also possible to arrange | position an extension part to the end surface part of the longitudinal direction of a blank, or to arrange | position only to one side surface. Moreover, it is also possible to arrange a plurality of extending portions with a gap in the longitudinal direction of the blank. In this case, the press-formed product has partial thickening portions arranged with a gap in the longitudinal 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. In other words, the extension of the blank is not limited to the shape protruding from the edge of the circumferential region including the adjacent unscheduled thickening portion,
Depending on the shape of the press-molded product, it is possible to have the same shape as the edge portion or a shape (recessed shape) that is recessed from the edge portion. 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. 17 is an exploded view for explaining the apparatus for manufacturing a press-formed product according to the second embodiment.
8 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 according to Embodiment 2 has a suppression mechanism that suppresses the amount of bending of the connecting wall portion 206 of the blank (preliminary molded body) 200 disposed in the lower mold (punch portion) 270. Generally different from the apparatus for manufacturing a press-formed product according to the first embodiment.

The suppression mechanism includes a through-hole 291, a pad portion (support member) 292, a stopper 293, a spring mechanism 294, a support member 295, and a pin member 298. The through hole 291 has a lower mold 2
70 is placed on top. The pad portion 292 is arranged so as to be able to protrude and retract from the through hole 291 and is biased in a direction protruding from the through 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 through hole 291 as the upper die (die portion) 260 is lowered, it does not affect the clamping of the lower die 270 and the upper die 260. The lower mold 27
Since the connecting wall portion 206 of the blank 200 arranged at 0 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 connecting wall portion 206 of the blank 200 is extended from the extension portion (projection portion) 214. It is possible to prevent the connecting wall portion 106 from buckling because excessive bending due to the material flow is avoided and the amount of bending is suppressed. That is, even when the indentation ratio is increased, it is possible to suppress buckling of the connecting wall portion 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 retreat of the pad portion 292 in the through hole 291 of the lower mold 270 and is composed of a reduced diameter portion disposed in the through hole 291, and 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 portion 206 of the blank 200 is prevented from flowing into the through hole 291, and the through hole 291 is suppressed.
The formation of traces or depressions corresponding to 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. Note that reference numeral 254 denotes
The base part of the press mold in which the spring mechanism 294 is arrange | positioned is shown.

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 through the through 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 such that the base portion 296 is in contact with the lower mold 270 and the pad portion 29
2 is set so as to protrude from the through hole 291 of the lower mold 270. The shaft portion 297 is
Since the pad portion 292 is not connected, the support member 295 can continue to retract even when the pad portion 292 is retracted 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 supporting the connecting wall portion 206 of the blank 200. That is, the suppression mechanism has an interlocking mechanism for interlocking the mold clamping of the upper mold 260 and the lower mold 270 with the support 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.

19 is a cross-sectional view for explaining the lowering of the upper die shown in FIG. 18, and FIG. 20 is a cross-sectional view for explaining the contact between the upper die and the pin member of the suppression mechanism, following FIG. FIG. 21 is a cross-sectional view for explaining a curved portion formed in the connecting wall portion of the blank, following FIG. 20, and FIG.
FIG. 23 is a cross-sectional view for explaining the disappearance of the bending portion, continued from FIG. 22, and FIG. 23 is a cross-sectional view for explaining the disappearance of the bending portion.

This manufacturing method is generally different from the manufacturing method of the press-formed product according to Embodiment 1 in that the amount of bending of the connecting wall portion 206 of the blank 200 is suppressed to suppress buckling of the connecting wall portion 206.

More specifically, first, the blank 200 is placed 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 provided on the support member 29.
5 is biased by a spring mechanism 294 and protrudes from the through hole 291 of the lower mold 270.

The upper die 260 is lowered toward the lower die 270 in order to clamp and press-mold (FIG. 1).
9). The pin member 298 arranged so as to protrude from the upper mold 260 is provided with a support member 295.
The base part 296 of this is abutted (see FIG. 20). At this time, the inner surface portion of the upper mold 260 and the pad portion 292
There is a space between them.

And the inner wall part of the upper mold | type 260 is the connection wall part 2 of the blank 200 arrange | positioned at the lower mold | type 270.
When contacting with 06, the clamping force of the upper mold 260 causes the extension part 214 of the blank 200 to move to the lower mold 2.
The extension 214 is deformed by pressing toward the stepped portion 272 of 70.

With the mold clamping operation, the connecting wall 206 is brought into contact with the upper mold 260 and the side wall 20
4, the end surface opposite to the connecting wall portion 206 is brought into contact with the step portion 272 of the lower mold 270, and the side wall portion 204 is pressed by the step portion 272 of the lower mold 270 and the upper mold 260.
The central portion of the connecting wall portion 206 is pressed by the pressing force acting on the connecting wall portion 206 from the side wall portion 204.
Bend to the lower mold side (a curved part is formed). At this time, a portion of the molding surface of the upper mold 260 corresponding to the corner portion between the side wall portion 204 and the connecting wall portion 206 of the blank 200 guides the corner portion to the connecting wall portion side.

Thereafter, the connecting wall 206 is sandwiched between the upper mold 260 and the lower mold 270 from the state in which the connecting wall 206 is bent, and the side wall 204 is inserted into the upper mold 260 and the lower mold from both sides in the length direction of the side wall 204. By compressing by 270, the curved part of the connection wall part 206 disappears, and the plate thickness of both the side wall part 204 and the connection wall part 206 is increased.

On the other hand, in the middle of the lowering of the upper mold 260, the pad portion 292 supports the connecting wall portion 206, and while maintaining the space a generated between the inner surface portion of the upper mold 260 and the pad portion 292, It moves backward in conjunction with the operation of the upper mold 260 (see FIG. 21).

Then, when the lowering of the upper mold 260 continues, the pad portion 292 deforms the curved portion of the connecting wall portion 206 of the blank 200 and generates a flat portion F (see FIG. 22). For this reason, the connecting wall portion 206 of the blank 200 is prevented from being excessively deformed, and the bending portion is prevented from buckling.

If 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 through hole 291 of the lower die 270 and stops. It is stopped by 293. Support member 295 supporting pad portion 292
The shaft portion 297 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 portion 206 of the blank 200 is pressed by the upper mold 260,
Disappear (see FIG. 23).

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 through 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 suppressing the amount of bending of the connecting wall portion of the blank even when the indentation ratio is increased.
Compared to the first embodiment, 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. 24 is a perspective view for explaining the blank according to the third embodiment, FIG. 25 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 (preliminary molded body) 300 according to Embodiment 3 has a protruding portion 315 formed on the upper mold side surface of the connecting wall portion 306 so as to bulge from the upper mold side surface (outer surface). Have. 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 portion 104, and will be described later. It is possible to efficiently increase the thickness of the connecting wall portion of the press-formed product. In addition, it is preferable from the point of productivity and cost to form the overhang | projection part 315 simultaneously when shape | molding the blank 300 from a rolling material.

The apparatus for manufacturing a press-formed product according to Embodiment 3 includes an upper die (die portion) 360 and a lower die (punch portion) 370 that are arranged to be close to and away from each other, and a side die 380. The lower mold 370 is
A stepped portion (contact surface) 372 extending along the edge 302 of the arranged blank 300 is provided. The side mold 380 is disposed on the side of the upper mold 360 and the lower mold 370 and the blank 3
It is positioned so as to face the end face 308 of 00.

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 in order to clamp and press-mold, the inner surface portion of the upper die 360 is an overhang arranged on the connecting wall portion 306 of the blank 300 arranged on the lower die 370. Abuts against the portion 315. The mold clamping force of the upper mold 360 is such that the overhanging portion 315 and the lower mold 17
Press toward the 0 inner surface. 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 portion 306 and the side wall portion 304 of the blank 300, causing an increase in the plate thickness of the planned thickness increase portion 312. That is, a press-formed product having a partially thickened portion is obtained. At this time, the overhanging portion 31
Since 5 is disposed on the connecting wall portion 306, the connecting wall portion of the press-formed product is efficiently increased in thickness.

  FIG. 27 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 portion and the side wall portion 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 part of a blank, it is especially possible to increase the thickness of the connection wall part of a press molded product efficiently. is there.

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

When the local part that requires rigidity or strength is small, the partial thickness increase part of the press-molded product occupies only a part of the circumferential region by adjusting the shape of the overhang part and the sectional thickness of the cavity at the time of clamping It is preferable to do so. For example, it is possible to efficiently reduce the weight of the press-molded product by reducing the overhanging portion and forming the partially thickened portion only on a part of the connecting wall portion of the press-molded product ( (See Modifications 1 to 3 of Embodiment 1).

  Next, a fourth embodiment will be described.

FIG. 28 is a perspective view for explaining the blank according to the fourth embodiment, and FIG. 29 is an exploded view for explaining the press-formed product manufacturing apparatus according to the fourth embodiment.

The blank (preliminary molded body) 400 according to Embodiment 4 has an overhanging portion 415 formed on the upper die side of the side wall portion 404 so as to bulge from the upper die side, and the connecting wall portion 40.
6 is generally different from the blank 300 according to the third embodiment having the overhanging portion 315 arranged at the position 6.

The apparatus for manufacturing a press-formed product according to Embodiment 4 includes an upper die (die portion) 460, a lower die (punch portion) 470, and a side die (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 mold, and the first and second lateral molds 490, 495.
Through which the first and second lateral molds 490 and 495 are driven,
Used to exert the clamping force of the upper mold 460 and the lower mold 470.

The first lateral mold 490 has a side wall portion 491, an extension portion 493, and a slope 492. The side wall portion 491 has an inner surface portion that is opposed to the overhang portion 415 and that corresponds to the outer surface shape of the side wall portion of the press-formed product. The extension portion 493 has an inner surface portion that is opposite to the blank connection wall portion 406 and that corresponds to the outer surface shape of the connection wall portion of the press-formed product. The slope 492 is disposed on the outer periphery of the corner portion that connects the side wall portion 491 and the extension portion 493. The cross-sectional thickness of the cavity at the time of clamping between the extension 493 and the top surface of the lower mold 470 is set larger than the plate thickness of the blank 400 in consideration of the increase in thickness due to material flow.

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 portion 496 has an inner surface portion that faces the overhang portion 415 and corresponds to the outer surface shape of the side wall portion of the press-formed product. The height of the side wall portion 496 substantially coincides with the height of the side wall portion 491 of the first lateral mold 490, and the second lateral mold 495 includes the extension 493 and the lower mold 4 of the first lateral mold 490.
It can be freely inserted into a space formed between the stepped portion (contact surface) 472 of 70.

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 sectional thickness of the cavity at the time of mold clamping between the side wall portions 491 and 496 and the lower mold 470 at the stop position is set larger than the plate thickness of the blank 400.

Therefore, when the first and second lateral molds 490 and 495 are driven so as to be close to each other, the side wall part 491 of the first lateral mold 490 and the side wall part 496 of the second lateral mold 495 are
A material flow that causes an increase in sheet thickness is generated by abutting the overhanging portion 415 and pushing in the overhanging portion 415. At this time, since the overhang portion 415 is disposed on the side wall portion 404, the side wall portion of the press-formed product can be efficiently thickened.

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. Upper mold 4
The protrusions 65 have slopes 466 and 467 corresponding to the slopes 492 and 497 of the first and second lateral molds 490 and 495.

When the upper mold 465 comes close to the lower mold 470, the slopes 466 and 467 of the protrusions are
In order to contact the slopes 492 and 497 of the first and second lateral molds 490 and 495, the slope 49
2,497 is pressed in the direction approaching. As a result, the first and second lateral molds 490, 49
5 are driven so as to be close to each other, abut against the projecting portion 415, and are pushed in.

The manufacturing apparatus according to Embodiment 4 has an interlocking mechanism for interlocking the proximity of the upper mold 465 to 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. The first and second lateral molds 490
, 495 can be applied with independent drive mechanisms or drive devices.

Next, a method for manufacturing a press-formed product according to Embodiment 4 will be described. FIG. 30 is a cross-sectional view for explaining the lowering of the upper die shown in FIG. 29, and FIG. Sectional drawing for demonstrating the curved part formed in a side wall part, FIG. 32 is FIG.
It is sectional drawing for demonstrating the loss | disappearance of a curved part following.

First, the blank 400 is disposed on the lower mold 470. The edge 402 of the blank 400 is
It contacts the step 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 portion 491 and the extension portion 493 of the first lateral mold 490 are opposed to the one overhang portion 415 and the connecting wall portion 406 of the blank, and the side wall portion 496 of the second lateral mold 495 is the other overhang portion 415. Are positioned so as to face each other. A corner portion located between the side wall portion 491 and the extension portion 493 and connecting the side wall portion 491 and the extension portion 493 has a molding surface having an arcuate cross section. The corner portion corresponds to a corner portion between the side wall portion 404 and the connecting wall portion 406 of the blank 400, and guides the side wall portion 404 to bend by guiding the corner portion of the blank 400 to the side wall portion side. Configure the means.

When the upper die 465 is lowered toward the lower die 470 in order to clamp and press-mold,
The slopes 466 and 467 of the upper mold 465 are in contact with the slopes 492 and 497 of the first and second lateral molds 490 and 495 located above the lower mold 470 (see FIG. 30).

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.

Between the side wall part 491 of the first lateral mold 490 and the side surface of the outer surface part of the lower mold 470, and the second
A space allowing material flow exists between the side wall portion 496 of the laterally facing die 495 and the side surface of the outer surface portion of the lower die 470, and the overhanging portion 415 of the blank 400 is located in the space. That is, during the mold clamping, the gap between the side wall 404 and the lower mold 470 is set larger than the gap between the connecting wall 406 and the lower mold 470. Therefore, the material of the overhang part 415 flows to the side and is pushed.

At this time, the side wall portion 491 of the first lateral mold 490 and the side wall section 496 of the second lateral mold 495 are used.
The side wall portion 404 is pressed by the contact wall portion 406, and the connecting wall portion 406 is brought into contact with the extension portion 493 of the first lateral mold 490, whereby the side wall portion 404 is bent by the pressing force acting on the side wall portion 404 from the connecting wall portion 406. (See FIG. 31).

That is, the connecting wall portion 406 is supported by the extension portion 493 and the lower die 470 of the first lateral die 490, and the side wall portion 404 is supported by the side wall portion 491 of the first lateral die 490 and the side wall portion 496 of the second lateral die 495. By pushing into the lower mold side, the center part of the side wall part 404 is bent toward the lower mold side (a curved part is formed). At this time, the corner portion of the first lateral mold 490 guides the corner portion of the blank 400 to the side wall portion side.

Thereafter, when the upper mold 465 continues to descend, the side wall portion 491 of the first lateral mold 490 and the second mold 490
The side wall portion 496 of the horizontal mold 495 is closer to the first and second horizontal molds 490, 49.
5, the space generated between the side wall portions 491 and 496 and the outer surface portion of the lower mold 470 is reduced (see FIG. 32). That is, from the state in which the side wall portion 404 is bent, the side wall portion 404 is changed to the first lateral mold 4.
The side wall portion 491 of the 90, the side wall portion 496 of the second lateral mold 495, and the lower mold 470 are sandwiched, and the connecting wall section 406 is inserted into the first lateral mold 49 from both sides in the length direction of the connecting wall section 406.
By compressing by the side wall portion 491 of 0 and the side wall portion 496 of the second lateral mold 495,
The curved portion of the side wall portion 404 disappears, and the thickness of both the side wall portion 404 and the connecting wall portion 406 is increased. Thereby, the press-formed product which has a partial thickening part is obtained.

At this time, since the overhang portion 415 is disposed on the side wall portion 404, the side wall portion of the press-formed product can be efficiently thickened. Moreover, since the cross-sectional thickness of the cavity at the time of clamping between the extension part 493 of the first lateral mold 490 and the blank connecting wall part 406 is set to allow material flow, the material of the overhang part 415 Flows smoothly, and the connecting wall portion of the press-formed product is efficiently increased in thickness.

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 part of a blank, it is especially possible to increase the thickness of the side wall part of a press molded product efficiently.

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 longitudinal direction of the blank. In this case, the press-formed product has partial thickening portions arranged with a gap in the longitudinal direction.

When the local part that requires rigidity or strength is small, the partial thickness increase part of the press-molded product occupies only a part of the circumferential region by adjusting the shape of the overhang part and the sectional thickness of the cavity at the time of clamping It is preferable to do so. For example, it is possible to efficiently reduce the weight of the press-molded product by reducing the overhanging portion and forming the partially thickened portion only on a part of the connecting wall portion of the press-molded product ( (See Modifications 1 to 3 of Embodiment 1).

  Next, a fifth embodiment will be described.

FIG. 33 is a perspective view for explaining the blank according to the fifth embodiment, FIG. 34 is a cross-sectional view for explaining the press-formed product manufacturing apparatus according to the fifth embodiment, and FIG. It is a perspective view for demonstrating the lower mold | type shown.

The fifth embodiment is generally different from the first embodiment in that a blank 500 made of a flat plate material (raw material) that is not preformed is applied.

The blank (preliminary molded body) 500 has a central extension 506 and a side extension 504 located on the side of the central extension 506. The central extension 506 corresponds to the connecting wall portion of the press-formed product. The side extension 504 corresponds to the side wall of the press-formed product. Also, blank 500
Has a thickened planned portion 512 and a thickened non-scheduled portion 516 corresponding to the partially thickened portion and the non-thickened portion of the press-formed product. The circumferential region including the planned thickening portion 512 has an extended portion (projecting portion) 514 disposed on the edge portion 502, and the circumferential length of the circumferential region is a partial increase in the press-formed product. It is longer than the circumferential length of the cross section of the circumferential region including the meat part.

The press-molding die has a preforming function for the blank 500, and includes an upper die (die portion) 560 and a lower die (punch portion) 570 that are arranged close to and away from each other, and a side die (not shown). Have.

The lower mold 570 includes a lower mold base 571, a split mold 574, and a spring mechanism 576.
The lower mold base 571 includes a stepped portion (contact surface) 572 extending along the side and the spring mechanism 5.
And a recess 575 for receiving 76.

When the mold is clamped, the split mold 574 comes into contact with the central extension 506 of the blank 500, and the upper mold 560.
The blank 500 is formed by being pushed into the inner surface of the sheet. Thereby, the blank 500 is
Corresponding to the shape of the press-formed product, the edge portion, the side wall portion extending from the edge portion, and the connecting wall portion for connecting the side wall portions will be provided, while the stepped portion 572 is an extension portion of the pre-formed blank 500 When 514 comes into contact and is pressed, a material flow that causes an increase in the plate thickness is generated.

The spring mechanism 576 has a recess 575 in the lower mold base 571 located below the split mold 574.
The split mold 574 is biased upward. The urging force of the split mold 574 is set smaller than the mold clamping force.

  Next, a method for manufacturing a press-formed product according to Embodiment 5 will be described.

36 is a sectional view for explaining the start of the preforming process, FIG. 37 is a sectional view for explaining the completion of the preforming process following FIG. 36, and FIG. 38 shows the blank shown in FIG. 39 and 40 are cross-sectional views for explaining the middle and completion of the process of forming the partially thickened portion, following FIG.

In the press molding step of the manufacturing method, first, the blank 500 is placed between the upper mold 560 and the lower mold 570. The central extension 506 of the blank 500 contacts the split mold 574 of the lower mold 570 (see FIGS. 34 and 35).

When the upper mold 560 is lowered toward the lower mold 570 in order to clamp and press-mold, the end surface 562 of the upper mold 560 contacts the side extension 504 of the blank 500. The clamping force of the upper mold 560 presses the side extension 504 of the blank 500 downward and deforms the side extension 504 (see FIG. 36).

When the lowering of the upper mold 560 continues, the blank 500 is preformed into a shape (hat-shaped cross section) along the outer surface portion of the lower mold 270 (see FIGS. 37 and 38). As a result, the blank 500 has an edge, a side wall extending from the edge, and a connecting wall connecting the side walls, and the extension 514 comes into contact with the step 572 of the lower mold base 571.

When the lowering of the upper die 560 continues further, the clamping force of the upper die 560 presses the extension portion 514 of the blank 500 toward the step portion 572 of the lower die base portion 571, so that the extension portion 514 is deformed. The material of the extension 514 flows upward and is pushed (see FIGS. 39 and 40).
. At this time, the extension portion 514 is located at the edge of the circumferential region including the planned thickening portion 512,
In addition, since the cross-sectional thickness of the cavity at the time of mold clamping considering the increase in thickness due to the material flow is set, the material flow of the extension 514 causes an increase in the plate thickness of the planned increase in thickness 512. Note that the urging force of the split mold 574 is set to be smaller than the clamping force and descends as the extension portion 514 is deformed, and thus does not interfere with the deformation of the extension portion 514.

As described above, in the fifth embodiment, the plate-shaped blank 100 is placed between the upper mold 560 and the lower mold 570 and clamped, so that the preliminary blank having a hat-shaped cross section is formed from the plate-shaped blank 100. The preforming process for forming the molded body, the bending process, and the thickening process are successively performed in order by a single mold clamping operation. Therefore, it is possible to improve productivity and further reduce the manufacturing cost.

  Next, a sixth embodiment will be described.

41 is a perspective view for explaining a press-formed product according to the sixth embodiment, FIG. 42 is a perspective view for explaining a blank according to the sixth embodiment, and FIG. 43 is according to the sixth embodiment. It is a perspective view for demonstrating a lower mold | type.

The sixth embodiment is generally different from the first embodiment regarding the configuration of the connecting wall portion. Embodiment 6
The connection wall portion 126 of the press-formed product according to the above is the through-hole 1 arranged at the edge of the partially thickened portion 132.
The connecting wall portion 106 of the blank (preliminary body) has a through-hole 118 disposed at the edge of the thickening scheduled portion 112.

The through-hole 118 in the blank corresponds to the through-hole 138 in the press-formed product, and has a structure that inhibits transmission of compressive stress. The through hole 118 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 has a function of improving the thickness increase efficiency of the partial thickness increase portion 132.

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. In addition, it is preferable in terms of productivity and cost that the extension 114 and the through hole 118 are formed by punching when a blank is formed from a rolled material. However, the extension 114 and the through hole 118 can be separately formed by machining. The blank is not limited to being formed from a rolled material, for example,
It is also possible to apply castings.

The blank according to the sixth embodiment is substantially the same as the blank according to the first embodiment except for the through-hole 118. Therefore, the manufacturing apparatus and the manufacturing method for the press-formed product according to the first embodiment are applied and implemented. It is possible to manufacture the press-formed product according to the sixth aspect. Therefore, the description of the press-molded product manufacturing apparatus and manufacturing method according to Embodiment 6 is omitted to avoid duplication.

As described above, in the sixth embodiment, since the flow of the material causing the increase in the cross-sectional thickness to the peripheral portion is suppressed by the through-hole having a simple structure, it is better than that in the first embodiment. It has a thickening efficiency. Moreover, since the through-hole is arrange | positioned at the connection wall part of a blank, it is possible to increase the thickness of the connection wall part 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 part of a blank, it is possible to increase the thickness of the side wall part of a press-molded product efficiently.

A through-hole can also be arrange | positioned in the side wall part of a blank, or can be arrange | positioned in both a connection wall part and a side wall part. 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.

  Next, a seventh embodiment will be described.

  FIG. 44 is a perspective view for explaining a lower mold according to the seventh embodiment.

Embodiment 7 relates to a manufacturing apparatus and a manufacturing method for a press-formed product, and is generally different from Embodiment 6, and is a suppression that suppresses the amount of bending of a connecting wall 206 of a blank (preliminary body) arranged in a lower mold 270. It has a mechanism. Since the press-molded product manufacturing apparatus and manufacturing method according to the second embodiment are applied to the press-molded product manufacturing apparatus and manufacturing method according to the seventh embodiment, the press-molded product according to the seventh embodiment is manufactured. The description of the apparatus and the manufacturing method is omitted to avoid duplication.

As described above, in the seventh embodiment, even when the indentation ratio is increased, the blank connecting wall 206 having the through hole 218 is supported by the pad portion 292, and the amount of bending is suppressed. The buckling of the blank can be suppressed, and the sixth embodiment
Compared to the above, it is possible to further increase the thickness of the partially thickened portion of the press-formed product.

  Next, an eighth embodiment will be described.

45 is a perspective view for explaining a blank according to the eighth embodiment, FIG. 46 is a perspective view for explaining a lower mold according to the eighth embodiment, and FIG. 47 is a modification of the eighth embodiment. It is a perspective view for demonstrating.

The eighth embodiment is generally different from the sixth embodiment regarding the configuration of the connecting wall portion of the blank (preliminary body). The connecting wall portion 306 of the blank according to the eighth embodiment has an overhang portion 315 and corresponds to the blank 300 according to the third embodiment. Further, the through hole 318 is adjacent to the overhang portion 315 and is located at the edge of the connection wall portion 306 to be increased in thickness 312. The through hole 318 inhibits the transmission of 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 portion of the press-formed product.

As shown in FIG. 47, the overhang portion 315 is not exclusive to the extension portion 114 according to the sixth 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 portion and the side wall portion of the press-formed product.

In addition, since the manufacturing apparatus and manufacturing method of the press-formed product according to the third embodiment are applied to the manufacturing apparatus and manufacturing method of the press-formed product according to the eighth embodiment, The description of the manufacturing apparatus and the manufacturing method is omitted to avoid duplication.

As described above, in the eighth embodiment, similarly to the sixth 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 8 is comprised from the overhang | projection part arrange | positioned at the connection wall part of a blank, it is possible to increase the thickness of the connection wall part of a press molded product efficiently especially. is there.

  Next, Embodiment 9 will be described.

FIG. 48 is a perspective view for explaining a blank (preliminary molded body) according to the ninth embodiment.

The ninth embodiment is generally different from the eighth embodiment regarding the configuration of the blank overhanging portion. The blank overhanging portion 415 according to the ninth embodiment is disposed on the side wall portion 404 and corresponds to the blank 400 according to the fourth embodiment. Further, the through hole 418 is located at the edge of the thickening scheduled portion 412 of the connecting wall portion 406. The through-hole 418 improves the thickness increase efficiency of the connecting wall portion of the press-molded product in order to suppress the flow from the thickness increase planned portion 412 to the non-thickness increase planned portion by inhibiting the transmission of compressive stress.

The press molded product manufacturing apparatus and manufacturing method according to the ninth embodiment is applied to the press molded product manufacturing method and manufacturing method according to the fourth embodiment. The description of the manufacturing apparatus and the manufacturing method is omitted to avoid duplication.

As described above, in the ninth embodiment, similarly to the sixth 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 9 is comprised from the overhang | projection part arrange | positioned at the side wall part of a blank, it is especially possible to increase the thickness of the side wall part of a press molded product efficiently.

  Next, an embodiment 10 will be described.

FIG. 49 is a perspective view for explaining slits included in the blank according to Embodiment 10.
FIG. 50 is a perspective view for explaining a press forming process according to the tenth embodiment.

The tenth embodiment is generally different from the sixth embodiment in which the suppression means configured by the through-hole 118 is configured such that the suppression means that suppresses the material flow is configured by the slit 618. The press-molded product manufacturing apparatus according to the tenth embodiment is substantially the same as the press-molded product manufacturing apparatus according to the sixth embodiment, and therefore description thereof will not be repeated.

The slit 618 is disposed at the edge of the planned thickening portion 612 of the blank (preliminary molded body) 600 and extends the side wall portion 604 and the connecting wall portion 606, and the side wall portion 604 and the connecting wall portion 6.
It is possible to inhibit the transmission of compressive stress via 06. An extension portion (projecting portion) 614 constituting a peripheral length extension portion is arranged on the edge portion 602 of the circumferential region including the planned thickening portion 612, and the circumferential direction including the planned thickening portion 612. The cross-sectional perimeter of the area is the non-planned part (
Peripheral portion) longer than the cross-sectional circumferential length of the circumferential region including 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 614 is positioned at the edge 602 of the circumferential region including the planned increase in thickness 612, and the sectional thickness of the cavity at the time of clamping is set in consideration of the increase in thickness due to material flow. Therefore, the flow of the material of the extension portion 614 causes an increase in the cross-sectional thickness of the planned thickness increase portion 612.

On the other hand, a slit 618 is located at the edge of the thickening scheduled portion 612. Slit 618
Prevents the increase in the planned thickness 612 from the planned increase in the thickness 616 by inhibiting the transmission of the compressive stress.
(See FIG. 50). The slit 618 includes a side wall portion 604 and a connecting wall portion 6.
Since 06 is extended, in addition to the material flow through the connecting wall portion 606, the material flow through the side wall portion 604 is also suppressed. That is, the material dispersed via the side wall portion 604 also flows into the connecting wall portion 606. Therefore, it is possible to further improve the effect of increasing the thickness of the connecting wall portion of the press-formed product.

As described above, according to the tenth embodiment, the slits having a simple structure are arranged in the side wall portion and the connection wall portion, and in addition to the material flow through the connection wall portion, the material flow through the side wall portion is also performed. Therefore, compared with Embodiment 6, it is possible to improve the effect of increasing the thickness of the connecting wall portion of the press-formed product.

In addition, when forming a blank from a rolling material, it is preferable to form a slit by the punching process from the point of productivity and cost. 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 | position a slit only to one side wall part and a connection wall part, or to arrange | position only to one side wall part.

  Next, an eleventh embodiment will be described.

FIG. 51 is a perspective view for explaining the blank according to Embodiment 11, and FIG.
It is sectional drawing for demonstrating the recessed part shown by.

The eleventh embodiment is generally different from the tenth embodiment configured by the slit 618 in that the suppression means for suppressing the flow of the material is configured by the recess 718. The press-molded product manufacturing apparatus according to the eleventh embodiment is substantially the same as the press-molded product manufacturing apparatus according to the sixth embodiment, and therefore description thereof will not be repeated.

The concave portion 718 is formed of a thin-walled portion, and is disposed on the inner surface of the edge of the planned thickening portion 712 of the blank (preliminary molded body) 700, and extends the side wall portion 704 and the connecting wall portion 706. It is possible to inhibit the transmission of compressive stress via the connecting wall portion 706. The recess 718 is preferable in that it has less influence on the rigidity than the slit 618. An extension portion (projecting portion) 714 that constitutes a circumferential extension portion is disposed on the edge 702 of the circumferential region including the planned thickening portion 712, and the circumferential direction including the planned thickening portion 712 The cross-sectional circumferential length of the region is longer than the cross-sectional circumferential length of the circumferential region including the thickening non-scheduled 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 714 is positioned at the edge 702 of the circumferential region including the planned increase in thickness 712, and the cross-sectional thickness of the cavity at the time of mold clamping considering the increase in thickness due to the flow of the material is set. Therefore, the flow of the material of the extension part 714 causes an increase in the cross-sectional thickness of the thickening scheduled part 712.

On the other hand, a recess 718 is located at the edge of the thickening scheduled portion 712. The concave portion 718 inhibits the transmission of compressive stress, thereby increasing the non-scheduled portion (peripheral portion) 71 from the planned thickening portion 712.
The flow to 6 is suppressed. Since the concave portion 718 extends the side wall portion 704 and the connecting wall portion 706, in addition to the material flow passing through the connecting wall portion 706, the material flow passing through the side wall portion 704 is also suppressed.

That is, since the material dispersed via the side wall portion 704 also flows into the connecting wall portion 706, the effect of increasing the thickness of the connecting wall portion of the press-formed product can be further improved. Since the recess 718 shrinks due to the material flow from the connecting wall portion 706, the recess 738 remaining in the partially thickened portion (part in the longitudinal direction) 732 of the press-molded product is smaller than the recess 718 of the blank 700. Become.

53 to 55 are cross-sectional views for explaining modified examples 1 to 3 according to the eleventh embodiment.
The recessed part before and behind press molding is shown.

By forming a recess in the inner surface portion of the upper mold facing the planned increase in thickness 712 of the blank 700 and increasing the gap between the increased thickness planned 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. 53). 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 planned portion 712, and the thickening planned portion 712 is formed.
By enlarging the gap between the lower die and the inner surface portion of the lower mold, it is possible to enlarge the space allowing the material to flow and increase the thickness with respect to the lower portion of the planned increase in thickness portion 712. In this case, a partially thickened portion 732 whose bottom surface is thickened is obtained (see FIG. 54).

Further, a concave portion is formed in the inner surface portion of the upper mold and the lower die facing the thickening planned portion 712, and a gap between the thickening planned portion 712 and the inner surface portion of the upper mold and the thickening planned portion 712 and the lower mold are formed. By enlarging the gap between the inner surface portion, the space for allowing the material to flow and increase in thickness is formed in the planned increase in thickness portion 7.
It is possible to zoom in on the top and bottom of the twelve. In this case, a partially thickened portion 732 having a thickened upper surface and lower surface is obtained (see FIG. 55).

FIG. 56 is a cross-sectional view for explaining the fourth modification according to the eleventh embodiment and shows the recesses before and after press molding.

In the target press-molded product, when the recess 718 remains undesired, the recess 718
It is possible to cope with this by adjusting the shape. For example, when the concave portion 718 is formed shallow, the concave portion 718 is eliminated by inflow of the material from the connecting wall portion 706, and the partial thickened portion 732 of the press-formed product can be prevented from having the concave portion 738.

As described above, the concave portion according to the eleventh embodiment has a simple structure and has less influence on the rigidity than the slit according to the tenth embodiment. It is easy to ensure rigidity.

In addition, when a recessed part shape | molds a blank from a rolling material, it is preferable from the point of productivity and cost to form by press molding. 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 part and a connection wall part, or to arrange | position only to one side wall part. It is also possible to arrange a plurality of recesses with a gap in the circumferential direction.

  Next, an embodiment 12 will be described.

57 is a perspective view for explaining the blank according to Embodiment 12, and FIG.
It is sectional drawing for demonstrating the bending part shown by FIG.

The twelfth embodiment is generally different from the eleventh embodiment in which the restraining means for restraining the material flow is constituted by the bent portion 818, and the restraining means is constituted by the recess 738. In addition,
The press-formed product manufacturing apparatus according to the twelfth embodiment is substantially the same as the press-formed product manufacturing apparatus according to the sixth embodiment, and therefore the description thereof will not be repeated.

The bent portion 818 is arranged on the outer surface of the edge portion of the planned thickness increase portion 812 of the blank (preliminary molded body) 800, extends the side wall portion 804 and the connecting wall portion 806, and connects the side wall portion 804 and the connecting wall portion 806 to each other. It is possible to inhibit the transmission of compressive stress via. The bent portion 818 is preferable in that it has less influence on rigidity compared to the concave portion 718 formed of a thin portion. The cross-sectional shape of the bent portion 818 is not particularly limited, but it is preferable to eliminate (or reduce) residual marks in the press-formed product by making the shape easy to deform, for example, a gentle arc shape.

An extension portion (projecting portion) 814 that constitutes a circumferential extension portion is arranged at the edge 802 of the circumferential region that includes the planned thickening portion 812, and the circumferential direction that includes the planned thickening portion 812. The cross-sectional peripheral length of the region is longer than the cross-sectional peripheral length of the circumferential region including the thickening non-planned part (peripheral part) 816.

Therefore, in the press molding process, the extension portion 814 of the blank 800 is pressed toward the step portion of the lower mold, whereby the extension portion 814 is deformed and the material flows upward. At this time, the extension portion 814 is positioned at the edge 802 in the circumferential region including the planned thickness increase portion 812, and the sectional thickness of the cavity at the time of mold clamping considering the increase in thickness due to the material flow is set. Therefore, the flow of the material of the extension portion 814 causes an increase in the cross-sectional thickness of the planned thickness increase portion 812.

On the other hand, a bent portion 818 is located at the edge of the thickening scheduled portion 812. The bent portion 818 is
By inhibiting the transmission of the compressive stress, the flow from the thickening scheduled part 812 to the thickening non-scheduled part 816 is suppressed. Since the bent portion 818 extends the side wall portion 804 and the connecting wall portion 806, in addition to the material flow via the connecting wall portion 806, the material flow via the side wall portion 804 is also suppressed. That is, since the material dispersed via the side wall portion 804 also flows into the connecting wall portion 806, the effect of increasing the thickness of the connecting wall portion of the press-formed product can be further improved. The bent portion 818 is deformed by being pressed by the upper mold and the lower mold, and disappears (or shrinks).

FIGS. 59 to 61 are cross-sectional views for explaining modified examples 1 to 3 according to the twelfth embodiment.
The bending part after press molding is shown.

By forming a recess in the inner surface portion of the upper mold that faces the planned increase in thickness 812 of the blank 800 and increasing the gap between the planned increase in thickness 812 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 area above the planned increase in thickness 812. In this case, a partially thickened portion (a part in the longitudinal direction) 832 whose upper surface is thickened is obtained (see FIG. 59).
. Reference numeral 836 denotes a non-thickened portion.

Further, a concave portion is formed in the inner surface portion of the lower mold facing the thickening planned portion 812, and the thickening planned portion 812 is formed.
By enlarging the gap between the lower die and the inner surface portion of the lower mold, it is possible to expand the space allowing the material flow and the thickening with respect to the lower portion of the thickening scheduled portion 812. In this case, a partially thickened portion 832 whose bottom surface is thickened is obtained (see FIG. 60).

Furthermore, a concave portion is formed in the inner surface portion of the upper mold and the lower mold facing the thickening planned portion 812, and a gap between the thickening planned portion 812 and the inner surface portion of the upper mold and the thickening planned portion 812 and the lower mold are formed. By enlarging the gap between the inner surface portion, the space for allowing the material to flow and increase in thickness is formed in the planned increase in thickness portion 7.
It is possible to zoom in on the top and bottom of the twelve. In this case, a partially thickened portion 832 whose upper and lower surfaces are thickened is obtained (see FIG. 61).

As described above, the bent portion according to the twelfth embodiment has a simple structure and has less influence on the rigidity than the concave portion according to the eleventh embodiment. It is easy to ensure product rigidity.

In addition, it is preferable from the point of productivity and cost to form a bending part by press molding, when shape | molding a blank from a 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 part and a connection wall part, or to arrange | position only to one side wall part. Furthermore, it is also possible to arrange a plurality of bent portions at intervals in the circumferential direction.

  Next, an embodiment 13 will be described.

62 is a perspective view for explaining a press-formed product according to Embodiment 1, FIG. 63 is a perspective view for explaining a blank according to Embodiment 13, and FIG. 64 is a blank shown in FIG. FIG.

The press-formed product (part) 920 according to the thirteenth embodiment is a substantially polygonal long object having an open cross-section, but does not extend linearly, and has an L-shaped curved portion curved in the longitudinal direction and The press-formed product 120 according to Embodiment 1 in that it has a portion extending linearly from both sides of the curved portion.
Is different. The L-shaped curved portion is provided with a partially thickened portion (a part in the longitudinal direction) 932 arranged at a local site where rigidity or strength is required. The side wall portion 924 and the connecting wall portion 926 of the partially thickened portion 932 are thicker than the side wall portion 924 and the connecting wall portion 926 of the non-thickened portion 936. The curved portion is not limited to an L shape, and may be a C shape, an acute angle shape, or a gentle arc shape, for example.

Blank (preliminary molded product) 900 according to Embodiment 13 for obtaining a press-formed product 920
Is different from the blank 100 according to the first embodiment in terms of the shape in the longitudinal direction and the shape of the open section. That is, the blank 900 corresponds to the shape of the press-formed product 920, has an L-shaped curved portion, and does not extend linearly in the longitudinal direction. Moreover, the corner part 905 which connects the side wall part 904 and the connection wall part 906 in the blank 900, and the connection wall part 906 have a gentle circular-arc-shaped cross section. The corner portion 905 and the connecting wall portion 906 are continuous (
Smooth) and has a semicircular cross section as a whole.

As described above, the corner portion 905 does not form a clear ridge line as compared with the blank 100 according to the first embodiment, and the plastic fluidity from the side wall portion 904 to the connecting wall portion 906 is the same as that of the embodiment. Compared to 1, it is improved.

Further, the planned thickness increase portion 912 of the blank 900 is located in the L-shaped curved portion, and the peripheral portion 902 of the circumferential region including the planned thickness increase portion 912 is an extension constituting a peripheral length extension portion. Part 91
4 (protrusion) is arranged.

The apparatus for manufacturing the press-formed product 920 according to the thirteenth embodiment is the same as the apparatus for manufacturing the press-formed product 100 according to the first embodiment, except that the shapes of the upper and lower mold surfaces in the longitudinal direction are different. FIG. 65 is a cross-sectional view for explaining the process of forming the partially thickened portion in the method for manufacturing a press-formed product according to Embodiment 13.

In the method for manufacturing a press-formed product according to Embodiment 13, first, the blank 900 is
It is arranged on the lower mold 970. The extension part 914 of the blank 900 abuts on the step part (abutment surface) 972 of the lower mold (punch part) 970. Note that the circumferential region including the unscheduled portion 916 has a shorter sectional circumferential length than the circumferential region including the extension 914, and thus is separated from the step portion 972 of the lower mold 970.

When the upper mold (die part) 960 is lowered toward the lower mold 970 for clamping and press molding, the inner surface of the upper mold 960 is connected to the connecting wall 90 of the blank 900 disposed on the lower mold 970.
6 abuts. The clamping force of the upper mold 960 is such that the extension 914 of the blank 900 is moved to the lower mold 970.
The extension portion 914 is deformed to press toward the step portion 972.

Since there is a space that allows material flow between the inner surface of the upper mold 960 and the top surface of the outer surface of the lower mold 970, the material of the extension 914 moves upward along with the mold clamping operation. It flows into and is pushed into.

At this time, the connecting wall portion 906 is brought into contact with the upper mold 960, and the end surface of the side wall portion 904 opposite to the connecting wall portion 906 is brought into contact with the stepped portion 972 of the lower mold 970. By pressing the side wall portion 904 with the 972 and the upper mold 960, the side wall portion 904 is pressed.
The connecting wall portion 906 is bent by the pressing force acting on the connecting wall portion 906. That is, the side wall portion 904 is supported by the upper die 960 and the lower die 970, and the connecting wall portion 906 is pushed into the lower die side by the upper die 960, so that the central portion of the connecting wall portion 906 is moved to the lower die side. Bend (a curved part is formed). And the site | part corresponding to the corner part 905 between the side wall part 904 and the connection wall part 906 of the blank 900 in the molding surface of the upper mold | die 960 guides the corner part 905 to the connection wall part side.

Note that the corner portion 905 and the connecting wall portion 906 of the blank 900 have a gentle arc-shaped cross section, and as a whole, have a semicircular cross section, do not constitute a clear ridge line, and from the side wall portion 904 The plastic fluidity to the connecting wall portion 906 is improved. Therefore, thickening scheduled part 91
Although 2 is located in the L-shaped curved portion, material inflow to the connecting wall portion 906 is easily caused. That is, since there is no restriction of material inflow due to the presence of the ridgeline, it is possible to avoid the increase in the thickness of the connecting wall portion 906.

Thereafter, the connecting wall portion 906 is sandwiched between the upper mold 960 and the lower mold 970 from the state where the connecting wall section 906 is bent, and the side wall portion 904 is inserted into the upper mold 960 and the lower mold from both sides in the length direction of the side wall portion 904. By compressing with 970, the curved part of the connection wall part 906 disappears, and the thickness of both the side wall part 904 and the connection wall part 906 is increased.

  FIG. 66 is a cross sectional view for illustrating the first modification according to the thirteenth embodiment.

The shape of the connecting wall portion 906 is not limited to a form having an arcuate cross section, and is a substantially flat central portion 9.
It is also possible to have 06A and an outer peripheral portion 906B having an arc-shaped cross section and connected to the corner portion 905. In this case, the outer peripheral portion 9 of the corner portion 905 and the connecting wall portion 906.
06B is connected continuously (smoothly) so as not to form a clear ridgeline,
It is set to form a large arcuate cross section.

  FIG. 67 is a perspective view for explaining the second modification according to the thirteenth embodiment.

The peripheral extension portion is not limited to the form constituted by the extension portion 914, and the overhang portion 915 can also be applied. In this case, the overhang portion 915 is formed on the upper mold side surface of the connection wall portion 906 so as to bulge from the upper mold side surface (outer surface), and efficiently increases the thickness of the connection wall portion 906. . The overhanging portion 915 is preferably configured by a gentle curved surface in consideration of plastic fluidity so as not to have a clear ridgeline.

  FIG. 68 is a perspective view for explaining the third modification according to the thirteenth embodiment.

The overhang portion 915 is not exclusive to the extension portion 914, and the extension portion 915 and the extension portion 914 can constitute a circumferential extension portion. In this case, the connecting wall 9
06 and the side wall part 904 can be efficiently increased in thickness.

As described above, since the thirteenth embodiment has improved plastic fluidity from the side wall portion to the connecting wall portion as compared with the first embodiment, for example, the connecting wall portion located in the L-shaped curved portion. Even so, the increase in thickness can be effectively promoted. Accordingly, it is possible to reduce the weight and reduce the manufacturing cost of the press-formed product having the curved portion.

  Next, an embodiment 14 will be described.

69 is a cross-sectional view for explaining a press-formed product according to Embodiment 14, FIG. 70 is a cross-sectional view for explaining a press-formed product manufacturing apparatus according to Embodiment 14, and FIG. 70
It is a perspective view for demonstrating the blank and lower mold | type shown by FIG.

The press-formed product (part) 1020 according to the fourteenth embodiment is different from the press-formed product 120 according to the first embodiment in that the thickness of the side wall portion 1024 is not constant, and the side wall portion 1024 includes a connecting wall portion. A side wall edge side portion 1024B having substantially the same thickness as that of 1026 and a side wall corner side portion 1024A having a thickness smaller than the thickness of the side wall edge side portion 1024B are provided.

Therefore, the press-formed product 1020 ensures rigidity or strength by the presence of the relatively thick side wall edge side portion 1024B in the side wall portion 1024, while being lightweight by the presence of the relatively thin side wall corner side portion 1024A. It is even easier to achieve this.

Blank (preliminary molded product) 10 according to Embodiment 14 for obtaining a press-formed product 1020
00 is substantially the same as the blank 100 according to the first embodiment.
The description will not be repeated.

The apparatus for manufacturing a press-formed product 1020 according to the fourteenth embodiment is generally different from the apparatus for manufacturing the press-formed product 100 according to the first embodiment with respect to the shape of the cavity during mold clamping.

More specifically, the outer surface portion of the lower mold 1070 has a connection wall forming surface 1076 and a side wall forming surface 1074 corresponding to the inner surfaces of the connection wall portion 1026 and the side wall portion 1024 of the press-formed product 1020. The inner surface portion of the upper mold 1060 has a connecting wall forming surface 1067 and a side wall forming surface 1064 corresponding to the outer surface of the connecting wall portion 1026 and the side wall portion 1024 of the press-formed product 1020.

The side wall molding surface 1064 includes a side wall corner side molding surface 1064A and a side wall edge side molding surface 10 corresponding to the side wall corner side portion 1024A and the side wall edge side portion 1024B of the side wall portion 1024.
64B. The side wall edge side molding surface 1064B is recessed with respect to the side wall corner side molding surface 1064A in consideration of the drawing direction of the upper mold 1060, and the side wall edge side molding surface 1064B and the side wall corner side molding surface 1064A are gently inclined. Connected continuously by faces.

The cavity formed during clamping between the connecting wall forming surface 1067 of the upper mold 1060 and the connecting wall forming surface 1076 of the lower mold 1070 is the connecting wall portion 10 of the press-formed product 1020.
It is set to correspond to 26 shapes. That is, the cross-sectional thickness of the cavity is set so as to allow the material flow for forming the connection wall portion 1026 of the press-formed product 1020.

The cavity formed during mold clamping between the side wall molding surface 1064 of the upper mold 1060 and the side wall molding surface 1074 of the lower mold 1070 is set so as to correspond to the shape of the side wall portion 1024 of the press-molded product 1020. .

More specifically, the side wall edge side molding surface 1064B of the upper mold 1060 and the side wall molding surface 1 of the lower mold 1070.
The sectional thickness of the cavity between 074 and the side wall corner side molding surface 1064A of the upper mold 1060
And the sectional thickness of the cavity between the connecting wall forming surface 1067 of the upper die 1060 and the connecting wall forming surface 1076 of the lower die 1070 is larger than the sectional thickness of the cavity between the lower die 1070 and the side wall forming surface 1074 of the lower die 1070. It is set to approximately match.

FIG. 72 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 14.

In the method for manufacturing a press-formed product according to the fourteenth embodiment, first, the blank 1000 is placed on the lower mold 1070. The extension (projection) 1014 of the blank 1000 is a lower mold 1
It contacts the step portion 1072 of 070. In addition, the extension part 1014 is arrange | positioned at the edge part 1002 of the circumferential direction area | region including the thickening scheduled part 1012. FIG. Further, the circumferential region including the unthickened portion 1016 has a shorter sectional circumferential length than the circumferential region including the extended portion 1014, and thus is separated from the stepped portion 1072 of the lower mold 1070.

When the upper mold (die part) 1060 is lowered toward the lower mold (punch part) 1070 in order to clamp and press-mold, the inner surface part of the upper mold 1060 is connected to the blank 1000 arranged on the lower mold 1070. Abuts against the wall 1006. The clamping force of the upper mold 1060 is blank 1000
In order to press the extended portion 1014 of the lower mold 1070 toward the stepped portion 1072 of the lower mold 1070, the extended portion 1
014 is deformed.

Since there is a space that allows material flow between the inner surface of the upper mold 1060 and the top surface of the outer surface of the lower mold 1070 (gap), the material of the extension 1014 moves upward along with the mold clamping operation. It flows into and is pushed into.

At this time, the connecting wall portion 1006 is brought into contact with the upper mold 1060, and the end surface of the side wall portion 1004 opposite to the connecting wall portion 1006 is brought into contact with the stepped portion 1072 of the lower mold 1070. The connecting wall portion 1004 is pressed by the pressing force acting on the connecting wall portion 1006 from the side wall portion 1004 by pressing the side wall portion 1004 by 1072 and the upper mold 1060.
6 is bent. That is, the side wall portion 1004 is supported by the upper die 1060 and the lower die 1070, and the connecting wall portion 1006 is pushed into the lower die side by the upper die 1060, whereby the central portion of the connecting wall portion 1006 is moved to the lower die side. Bend (a curved part is formed). And upper mold 1
The part corresponding to the corner portion 1005 between the side wall portion 1004 of the blank 1000 and the connecting wall portion 1006 on the molding surface of 060 guides the corner portion 1005 to the connecting wall portion side.

Thereafter, the connecting wall portion 1006 is sandwiched between the upper die 1060 and the lower die 1070 from the state in which the connecting wall portion 1006 is bent, and the side wall portion 1004 is inserted into the upper die 1060 and the lower die from both sides in the length direction of the side wall portion 1004. The connecting wall 100 is compressed by 1070.
6 disappears, and the thickness of both the side wall portion 1004 and the connecting wall portion 1006 is increased.

At this time, the side wall edge side molding surface 1064B of the upper mold 1060 and the side wall molding surface 107 of the lower mold 1070 are arranged.
4 is larger than the sectional thickness of the cavity between the side wall corner side molding surface 1064A of the upper mold 1060 and the side wall molding surface 1074 of the lower mold 1070, and the upper mold 1
The cross-sectional thickness of the cavity between the connection wall forming surface 1067 of 060 and the connection wall forming surface 1076 of the lower mold 1070 is set to be substantially the same. Therefore, the material is filled in the cavity by the flow of the material in which the curved portion of the connecting wall portion 1006 disappears. Accordingly, the side wall portion 1024 of the press-formed product 1020 includes a side wall edge side portion 1024B having substantially the same thickness as the thickness of the connection wall portion 1026 and a side wall corner side having a thickness smaller than the thickness of the side wall edge side portion 1024B. It will have the part 1024A.

  FIG. 73 is a cross-sectional view for explaining the first modification according to the fourteenth embodiment.

The thickness of the connecting wall portion 1026 of the press-formed product 1020 is not limited to the form that is substantially the same as the thickness of the side wall edge side portion 1024B, and may be smaller than the thickness of the side wall edge side portion 1024B. In this case, the cross-sectional thickness of the cavity between the connecting wall forming surface 1067 of the upper mold 1060 and the connecting wall forming surface 1076 of the lower mold 1070 is set to the side wall edge forming surface 1064B of the upper mold 1060 and the side wall forming surface 1074 of the lower mold 1070. Smaller than the cross-sectional thickness of the cavity between.

In addition, by combining the fourteenth embodiment and the first modification thereof, a press-formed product 1020 is obtained.
It is also possible to partially change (make different) the thickness of the connecting wall portion 1026. Moreover, it is also possible to change suitably the ratio (ratio of the side wall edge side site | part 1024B with respect to the side wall corner side site | part 1024A) which the thick part in the side wall part 1024 of the press molded product 1020 occupies.

74 and 75 are cross-sectional views for explaining the second modification and the third modification according to the fourteenth embodiment.

The shape of the open section of the press-formed product 1020 is not limited to a substantially rectangular shape. For example, the upper mold 106
By appropriately changing the inner surface portion of 0 and the outer surface portion of the lower mold 1070, the press-molded product having a mountain-shaped open cross section in which the side wall portion 1024 is inclined and the connecting wall portion 1026 is slightly curved is shown in the fourteenth embodiment. Modification 1 can also be applied.

As described above, in the fourteenth embodiment, the plate thickness of the end surface peripheral portion on the side opposite to the connection wall portion side of the side wall portion can be made larger than the plate thickness of the end surface peripheral portion on the connection wall portion side, While ensuring rigidity or strength, it becomes easier to reduce the weight.

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, Modifications 1 to 3 according to Embodiment 1 are applied to Embodiments 2 to 4 and Embodiments 6 to 9, or Embodiment 2 is applied to Embodiment 3 and its modifications. Or, apply the tenth to twelfth embodiments to the sixth to ninth embodiments, or modify the first to third modifications according to the eleventh embodiment,
It can also be applied to the sixth to tenth embodiments. Embodiments 6 and 10-1
2 can also be applied to the thirteenth and fourteenth embodiments.

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

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.

The side wall portion and the connecting wall portion 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. Moreover, it is also possible to apply to the angle-shaped blank and press-molded product which the end of a side wall part is mutually connected and does not have a connection wall part. 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. It is a graph for demonstrating the relationship between an indentation ratio and a press molding result. 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. It is sectional drawing for demonstrating the manufacturing method of the press molded product which concerns on Embodiment 2, and has shown the fall of the upper mold | type shown by FIG. FIG. 20 is a cross-sectional view illustrating the contact between the upper mold and the pin member of the suppression mechanism, following FIG. 19. It is sectional drawing for demonstrating the curved part formed in the connection wall part of a blank following FIG. It is sectional drawing for demonstrating the flat part formed in a curved part following FIG. FIG. 23 is a cross-sectional view for explaining the disappearance of the bending portion, following FIG. 22. 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 molded 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 part of a blank following FIG. FIG. 32 is a cross-sectional view for explaining the disappearance of the bending portion, following FIG. 31. It is a perspective view for demonstrating the blank which concerns on Embodiment 5. FIG. FIG. 10 is a cross-sectional view for explaining a device for manufacturing a press-formed product according to Embodiment 5. It is a perspective view for demonstrating the lower mold | type shown by FIG. It is sectional drawing for demonstrating the manufacturing method of the press molded product which concerns on Embodiment 5, and has shown the start of the preforming process. FIG. 37 is a cross-sectional view for explaining the completion of the preforming process following FIG. 36. It is a perspective view for demonstrating the blank shown by FIG. It is sectional drawing for demonstrating the middle of the formation process of the partial thickening part following FIG. It is sectional drawing for demonstrating completion of the formation process of the partial thickening part following FIG. 10 is a perspective view for explaining a press-formed product according to Embodiment 6. FIG. It is a perspective view for demonstrating the blank which concerns on Embodiment 6. FIG. FIG. 10 is a perspective view for explaining a lower mold according to a sixth embodiment. FIG. 10 is a perspective view for explaining a lower mold according to a seventh embodiment. It is a perspective view for demonstrating the blank which concerns on Embodiment 8. FIG. FIG. 10 is a perspective view for explaining a lower mold according to an eighth embodiment. FIG. 29 is a perspective view for explaining a modification of the eighth embodiment. It is a perspective view for demonstrating the blank which concerns on Embodiment 9. FIG. It is a perspective view for demonstrating the slit which the blank concerning Embodiment 10 has. FIG. 10 is a perspective view for illustrating a press forming process according to Embodiment 10. It is a perspective view for demonstrating the blank which concerns on Embodiment 11. 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 11, and has shown the recessed part before and behind press molding. It is sectional drawing for demonstrating the modification 2 which concerns on Embodiment 11, and has shown the recessed part before and behind press molding. It is sectional drawing for demonstrating the modification 3 which concerns on Embodiment 11, and has shown the recessed part before and behind press molding. It is sectional drawing for demonstrating the modification 4 which concerns on Embodiment 11, and has shown the recessed part before and behind press molding. It is a perspective view for demonstrating the blank which concerns on Embodiment 12. 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 12, and shows the bending part after press molding. It is sectional drawing for demonstrating the modification 2 which concerns on Embodiment 12, and has shown the bending part after press molding. It is sectional drawing for demonstrating the modification 3 which concerns on Embodiment 12, and has shown the bending part after press molding. FIG. 38 is a perspective view for illustrating a press-formed product according to Embodiment 13. It is a perspective view for demonstrating the blank which concerns on Embodiment 13. FIG. FIG. 64 is a cross-sectional view of the blank shown in FIG. 63. It is sectional drawing for demonstrating the formation process of the partial thickening part in the manufacturing method of the press molded product which concerns on Embodiment 13. FIG. It is sectional drawing for demonstrating the modification 1 which concerns on Embodiment 13. FIG. FIG. 38 is a perspective view for illustrating a second modification according to the thirteenth embodiment. FIG. 38 is a perspective view for illustrating a third modification according to the thirteenth embodiment. FIG. 25 is a cross-sectional view for explaining a press-formed product according to Embodiment 14. FIG. 25 is a cross-sectional view for explaining a device for manufacturing a press-formed product according to Embodiment 14. It is a perspective view for demonstrating the blank and lower mold | type shown by FIG. It is sectional drawing for demonstrating the formation process of the partial thickening part in the manufacturing method of the press molded product which concerns on Embodiment 14. FIG. It is sectional drawing for demonstrating the modification 1 which concerns on Embodiment 14. FIG. It is sectional drawing for demonstrating the modification 2 which concerns on Embodiment 14. FIG. It is sectional drawing for demonstrating the modification 3 which concerns on Embodiment 14. FIG.

100 blank (preform)
102 edge,
104 side wall,
106 connecting wall,
108 end face,
112 Planned increase in thickness,
114 Extension (protrusion),
116 Unscheduled thickness increase (peripheral area),
118 through hole,
120 Press-formed products (parts),
122 edge,
124 side wall,
126 connecting wall,
132 Partially thickened part (a part in the longitudinal direction),
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,
160 Upper mold (die part),
170 Lower mold (punch part),
172 Stepped portion (contact surface),
180 lateral type,
200 blank (preform)
206 connecting wall,
214 Extension (protrusion),
218 through hole,
254 base,
260 Upper mold (die part),
270 Lower mold (punch part),
272 Stepped portion (contact surface),
291 insertion hole,
292 pad part (support member),
293 stopper,
294 spring mechanism,
295 support member,
296 base,
297 shaft part,
298 pin member,
300 blank (preform)
302 edge,
304 side wall,
306 connecting wall,
308 end face,
312 Planned increase in thickness,
315 Overhang part,
318 through-hole,
360 Upper die (die part),
370 Lower mold (punch part),
372 Stepped portion (contact surface),
380 lateral type,
400 blank (preform)
402 edge,
404 side wall,
406 connecting wall,
412 Planned increase in thickness,
415 Overhang part,
418 through hole,
460 Upper mold (die part),
465 Upper mold,
466, 467 slopes,
470 Lower mold (punch part),
472 Stepped portion (contact surface),
490 1st horizontal type,
491 side wall,
492 slope,
493 extension,
495 2nd horizontal type (die part),
496 side wall,
497 slope,
500 blank (preform)
502 edge,
504 lateral extension,
506 Central extension,
512 Thickening planned part,
514 Extension (protrusion),
516 Unscheduled part of increased thickness,
560 Upper mold (die part),
562 end face,
570 Lower mold (punch part),
571 Lower mold base,
572 Stepped portion (contact surface),
574 split type,
575 recess,
576 spring mechanism,
600 blank (preform)
602 edge,
604 side wall,
606 connecting wall,
612 Thickening planned part,
614 Extension (protrusion),
616 Non-expected area for increased thickness (peripheral area),
618 slit,
700 blank (preform)
702 edge,
704 side wall,
706 connecting wall,
712 Thickening planned part,
714 Extension (protrusion),
716 Unexpected thickness increase (peripheral area),
718 recess,
732 partially thickened part (a part in the longitudinal direction),
736 Non-thickened part,
738 recess,
800 blank (preform)
802 edge,
804 side wall,
806 connecting wall,
812 Thickening planned part,
814 extension (protrusion),
816 Unscheduled part (peripheral part),
818 bent part,
832 Partially thickened part (a part in the longitudinal direction),
836 Non-thickened part,
900 blank (preform)
902 edge,
904 side wall,
905 corner,
906 connecting wall,
906A Central part 906B Outer peripheral part 912
914 Extension (protrusion),
915 overhang,
920 press-formed products (parts),
924 side wall,
926 connecting wall,
932 partially thickened portion (a part in the longitudinal direction),
936 Non-thickened part,
960 Upper mold (die part),
970 Lower mold (punch part),
972 Stepped portion (contact surface),
1000 blank (preform)
1002 edge,
1004 side wall,
1005 Corner section,
1006 connecting wall,
1012 Thickening planned part,
1014 Extension (protrusion),
1016 Unscheduled part of increased thickness,
1020 Press-formed product (parts),
1024 side wall,
1024A side wall corner side part,
1024B side wall edge side part,
1026 connecting wall,
1060 Upper die (die part),
1064 side wall molding surface,
1064A Side wall corner side molding surface,
1064B side wall edge side molding surface,
1067 connecting wall molding surface,
1070 Lower mold (punch part),
1072 Stepped portion (contact surface),
1074 side wall molding surface,
1076 connecting wall molding surface,
a space,
F Flat part.

Claims (26)

A method for producing a part having a hat-shaped cross section by press molding,
A preparation step of preparing a preform having a hat-shaped cross section having a pair of spaced apart side wall portions and a connecting wall portion connecting the end portions of the side wall portions;
An arrangement step of arranging the preform in a mold;
A bending step of bending at least one of the connecting wall portion and the side wall portion with a gap in the mold by pressing the preform with the mold during the mold clamping operation of the mold. ,
In a state where at least one of the connection wall portion and the side wall portion is bent, the bent portion is sandwiched by the molding die, and the other of the connection wall portion and the side wall portion is connected to the other of the other in the hat-shaped cross section. And a thickness increasing step of increasing the thickness of both the side wall portion and the connecting wall portion by compressing the wall portion from both sides in the length direction with the molding die. The mold includes a punch portion disposed inside the preform, and a die portion that presses the outer surface of the preform toward the punch portion by relative movement with the punch portion. And
In the bending step,
The gap between one of the connecting wall and the side wall and the punch is set to be larger than the gap between the other of the connecting wall and the side and the punch.
While supporting the other of the connecting wall part and the side wall part by the punch part and the die part, by pushing one of the connecting wall part and the side wall part to the punch part side by the die part, The method according to claim 1, wherein one central part of the connecting wall part and the side wall part is bent toward the punch part side. In the bending step,
Along with the mold clamping operation, the connecting wall portion is brought into contact with the die portion, and at least a part of the end surface of the side wall portion opposite to the connecting wall portion side is formed at the base portion of the punch portion. The corner portion that connects the side wall portion and the connecting wall portion is guided to the connecting wall portion side while being in contact with the abutting surface and pressing the side wall portion by the abutting surface of the punch portion and the die portion. The method according to claim 2, wherein the connecting wall portion is bent. When the connecting wall portion is bent in the bending step, the connecting wall portion is bent toward the punch portion side while the connecting wall portion is supported by the supporting member from the punch portion side, thereby bending the connecting wall portion. 4. The method of claim 3, wherein the amount is suppressed. The preformed body prepared in the preparation step has a protruding portion that protrudes from an end surface of the side wall portion opposite to the connecting wall portion side, or a protruding portion that bulges from the outer surface of the connecting wall portion. And
In the bending step,
The connecting wall portion is bent by bringing the protruding portion into contact with an abutting surface formed on a base portion of the punch portion, or pressing the overhang portion with the die portion. 3. The method according to 3. Placing a flat plate-like material between the punch portion and the die portion, and clamping the die to form the preform from the flat plate material, the bending step, the thickness increasing step, The method according to claim 3, wherein the processes are sequentially performed by a single clamping operation. In the arrangement step, the end surface of the side wall portion opposite to the connection wall portion side is brought into contact with a contact surface formed on the base portion of the punch portion,
In the bending step, a corner portion that connects the side wall portion and the connecting wall portion is formed on the side wall portion side while pressing the side wall portion by the die portion and bringing the connecting wall portion into contact with the die portion. The method according to claim 2, wherein the side wall portion is bent by guiding. The preformed body prepared in the preparation step has a projecting portion that bulges from the outer surface of the side wall portion,
The method according to claim 7, wherein in the bending step, the side wall portion is bent by pressing the overhang portion with the die portion. The shape of the preform is a long shape extending in a cross-sectional hat shape,
In the thickness increasing step, the thickness of the side wall portion and the connecting wall portion in a part in the longitudinal direction of the preform is increased, and movement of both ends in the longitudinal direction of the preform is performed.
The method according to claim 1, wherein the method is regulated by a lateral mold. In the preparation step, a suppressing means for suppressing material flow in the thickening step is formed in a part of the longitudinal direction of the preform.
The method according to claim 9, wherein in the thickening step, material flow from a part in the longitudinal direction to a peripheral part of the part is suppressed. The method according to claim 10, wherein the suppression means is configured by at least one of a through hole, a slit, a concave portion, or a bent portion having a structure that inhibits transmission of compressive stress. The component has a longitudinally curved portion;
The preform has a curved portion corresponding to the curved portion of the component, and a corner portion connecting the side wall portion and the connecting wall portion of the preform has a gentle arc-shaped cross section. And
In the bending step, when guiding the corner portion located in the curved portion to the connecting wall portion side, material inflow from the corner portion to the connecting wall portion side in the curved portion is promoted. The method of claim 3. In the thickness increasing step, the thickness of the peripheral portion of the end surface on the side opposite to the connecting wall portion side of the side wall portion is made larger than the thickness of the peripheral portion of the end surface on the side of the connecting wall portion. The method of claim 3. A long press-formed product having a hat-shaped cross section having a pair of spaced apart side wall portions and a connecting wall portion connecting the end portions of the side wall portions,
The plate thickness of the side wall portion and the connecting wall portion in a part in the longitudinal direction is increased by press molding from the plate thickness of the side wall portion and the connecting wall portion in the peripheral portion of the part. Molding. The press-formed product according to claim 14, wherein the hardness of the part is greater than the hardness of the peripheral part. The press-formed product according to claim 14, wherein the press-formed product has a curved portion in a longitudinal direction, and a part of the longitudinal direction is located in the curved portion. The press according to claim 14, wherein a plate thickness of an end surface peripheral portion on the side opposite to the connection wall portion side of the side wall portion is larger than a plate thickness of an end surface peripheral portion on the connection wall portion side. Molding. An apparatus for producing a part having a hat-shaped cross section by press molding,
A preform having a hat-shaped cross section having a pair of side wall portions that are spaced apart from each other and a connecting wall portion that connects ends of the side wall portions;
The mold includes a punch portion disposed inside the preform, and a die portion that presses the outer surface of the preform toward the punch portion by relative movement with the punch portion. And
The cross-sectional thickness of the cavity formed by the punch portion and the die portion at the time of clamping is as follows:
It is set larger than the plate thickness of the preform,
The punch portion and the die portion are
During the mold clamping operation, the preform is pressed, and at least one of the connecting wall portion and the side wall portion is bent by a gap in the molding die,
In a state where at least one of the connecting wall portion and the side wall portion is bent, the bent portion is sandwiched, and the other of the connecting wall portion and the side wall portion is the length of the other wall portion in the hat-shaped cross section. The apparatus is characterized by increasing the thickness of both the side wall portion and the connecting wall portion by compressing from both sides in the vertical direction. During the mold clamping operation, the gap between the one of the connecting wall part and the side wall part and the punch part is set larger than the gap between the other of the connecting wall part and the side wall part and the punch part. ,
When bending one of the connecting wall part and the side wall part, the punch part and the die part support the other of the connecting wall part and the side wall part, and the die part is connected to the connecting wall part and the side wall part. 19. The manufacturing apparatus according to claim 18, wherein one of the side wall portions is pushed into the punch portion side to deflect one central portion of the connection wall portion and the side wall portion toward the punch portion side. . The punch portion has a base portion on which a step portion with which the end surface of the side wall portion on the side opposite to the connecting wall portion abuts is formed,
The die part is
Along with the clamping operation, the connecting wall portion is brought into contact with the die portion, and at least a part of the end surface of the side wall portion opposite to the connecting wall portion side is brought into contact with the step portion of the punch portion. And when pressing the side wall portion by the contact surface of the punch portion and the die portion,
19. The manufacturing apparatus according to claim 18, further comprising guide means for bending the connecting wall portion by guiding a corner portion connecting the side wall portion and the connecting wall portion to the connecting wall portion side. . It has a support member that can move freely from the punch part,
19. The manufacturing apparatus according to claim 18, wherein when the connecting wall portion is bent, the support member moves backward toward the punch portion while supporting the connecting wall portion from the punch portion side. The die part has a plurality of split molds integrally provided with a contact surface that contacts the connecting wall part and a pressing surface that presses the side wall part,
The split type is
The end surface of the side wall portion opposite to the connection wall portion side is brought into contact with the step portion of the punch portion,
When the side wall portion is pressed by the split mold pressing surface and the connecting wall portion is brought into contact with the split mold contact surface,
The manufacturing apparatus according to claim 18, further comprising guide means for bending the side wall portion by guiding a corner portion connecting the side wall portion and the connecting wall portion toward the side wall portion. The portion corresponding to the corner portion between the side wall portion and the connecting wall portion on the molding surface of the die portion has an arc-shaped cross section,
The manufacturing apparatus according to claim 22, wherein the guide means includes a portion having the arcuate cross section. The shape of the preform is a long shape extending in a cross-sectional hat shape,
The mold has side molds that come into contact with both longitudinal end faces of the preform,
When the side molds increase the thickness of the side wall part and the connecting wall part in a part in the longitudinal direction of the preform by the punch part and the die part, The manufacturing apparatus according to claim 18, wherein movement is restricted. The component has a longitudinally curved portion;
The preform has a curved portion corresponding to the curved portion of the component, and a corner portion connecting the side wall portion and the connecting wall portion of the preform has a gentle arc-shaped cross section. And
The manufacturing apparatus according to claim 18, wherein the cavity has a curved portion corresponding to the curved portion of the component. The inner surface portion of the die portion includes a corner-side molding surface corresponding to an end surface peripheral portion on the connection wall portion side in the side wall portion of the component, and an edge-side molding surface corresponding to an end surface peripheral portion on the opposite side to the connection wall portion side. Have
The edge side molding surface is recessed from the corner side molding surface,
The manufacturing apparatus according to claim 18, wherein a cross-sectional thickness of the cavity on the edge-side molding surface is set larger than a cross-sectional thickness of the cavity on the corner-side molding surface.

Images