JP2000107811A - Press die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a press die with which a pressed products having an inverse part is formed in one process. SOLUTION: By lowering an upper die 20, the die 21 of the upper die, die insert 22 of the upper die and cam slider 23 are lowered and a blank holding part (wc) is inserted between a blank holder 12 which is upward energized and the die insert 22 of the upper die. By further lowering the upper die 20, the cam slider 23 is moved to the left with a cam 30 and the inverse part (wb) is formed by cooperation of the inverse part working surface 11b of the punch 11 of a lower die with the cam slider 23. Simultaneously, in cooperation of the working surface 21a of the main body of the upper die of the die 21 of the upper die with working surface 11a of the main body of the lower die of the punch 11 of the lower die, the main-body part (wa) of a material (w) to be worked is formed and the pressed products W are obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press die attached to a press machine for performing press working, and more particularly to a press for forming a press product having an inverse portion whose peripheral edge is bent obliquely inward. Regarding the mold.

[0002]

2. Description of the Related Art For example, an automobile roof panel (hereinafter referred to as a "workpiece") w is a single-piece drawing viewed from above as shown in FIG.
As shown in the figure, it is formed by pressing after cutting a steel sheet as a raw material into a predetermined shape, the upper, lower,
Left and right are assembled to the vehicle body so that they correspond to the front, rear, left, and right sides of the vehicle body, respectively.

The workpiece w is formed in a substantially rectangular shape when viewed from the top, and the left and right side edges thereof are folded over substantially the entire length in the front-rear direction, as shown in FIG. The song is formed.

In FIG. 7, a portion whose center is relatively flat and both side edges gradually descend is a main body portion wa, and a portion continuous to both left and right side edges of the main body portion wa is an inverse portion wb.
It is assumed that. The inverse end wb has its base end bent further inward than vertically.

Conventionally, press forming of the inverse portion wb is performed as follows.
It is performed in two steps. The first step uses a draw mold shown in FIG. 8, and the second step uses a cam wrist mold shown in FIG.

In the first step, as shown in FIG. 8, a workpiece w is set on the upper surface of the lower die punch 1 and the blank holder 2, and the upper die 3 is lowered. As the upper die 3 descends, the blank holder 2 and the upper die 3 hold the wrinkle holding portion wc, and the workpiece w is bent by the cooperation of the upper die 3 and the lower die 1 as shown in FIG. Then, the body portion wa that is gently curved and the inverse forming portion wb ′ that becomes the inverse portion wb in the second step are formed. The base end portion of the inverse forming portion wb 'is bent substantially perpendicularly in the same direction as the lowering direction of the upper die 3 as shown in the figure.

After the wrinkle holding portion wc is cut off, an inverse forming portion wb 'is formed in the next second step by using a cam wrist mold shown in FIG. This cam wrist type is a lower die punch 4 in which the lower die is slidable left and right.
The upper die is provided with a pad 6 which is urged downward, and the lower die punch 4 is fixedly provided with a cam slider 7 which is slidable in the left-right direction and which comes into contact with and separates from the lower die punch 4. The workpiece w is set on the upper surface.

Subsequently, the upper die is lowered, and the body portion wa of the workpiece w is pressed against the upper surface of the lower die punch 4 by the pad 6 and fixed. Then, the upper die is lowered to lower the cam slider 7 so as to come into contact with the cam 5.
To move the cam slider 7 by the cam 5 to the left in the figure.

The diagonally downward movement combined with the downward and leftward movements of the cam slider 7 causes the inverse forming part wb 'to bend inward by the cooperation of the lower die punch 4 and the cam slider 7 so that the inverse part wb Becomes

Thereafter, when the upper die is raised, the cam slider 7 is retracted rightward by an urging member (not shown), and further, the lower die punch 4 is retracted leftward. This makes it possible to remove the workpiece w having the inversely bent inverse wb. The workpiece w serves as the roof panel (press product).

[0011]

However, according to the above-mentioned conventional example, two steps are required to finish the plate-shaped workpiece w into a pressed product, and in the subsequent steps, the lower die punch is required. The press product cannot be removed unless 4 is retracted, requiring many facilities and man-hours for two processes, and a complicated structure for retracting the lower die punch is required.

Accordingly, a first object of the present invention is to provide a press die capable of reducing the number of facilities and the number of processing steps by enabling one step, which has been conventionally two steps. It is assumed that.

It is a second object of the present invention to provide a press die which does not require retraction of a lower punch to remove a press product and can simplify the configuration.

[0014]

According to a first aspect of the present invention, there is provided a mold for machining a lower die body, the lower die having a shape corresponding to a shape of a main body portion excluding the inverse portion in a pressed product. A lower die punch having a surface and an inverse part processing surface formed on the side of the lower die body processing surface and having a shape corresponding to the inner surface shape of the inverse part, and an inverse part processing surface of the lower die punch. A blank holder having a lower wrinkle holding surface having a shape corresponding to the inner surface shape of the wrinkle holding portion continuously and outwardly extended from the tip of the inverse portion in the press product, which is disposed adjacent to the press product,
The upper die is an upper die having a lower die body processing surface for forming the main body of the pressed product in cooperation with the lower die body processing surface of the lower die punch, and is integrally formed with the upper die. An upper die insert having an upper wrinkle holding surface for clamping the wrinkle holding portion of the press product in cooperation with a lower wrinkle holding surface of the blank holder, and a substantially horizontal surface which comes into contact with and separates from an inverse portion processing surface of the lower die punch. A cam slider that is supported by the upper die so as to be slidable in the direction and that cooperates with the processing surface of the inverse part to form the inverse part. A cam which slides in a substantially horizontal direction close to the processing surface of the inverse portion is provided.

According to the first aspect of the present invention, when the upper die is lowered with respect to the lower die, the wrinkle holding portion of the workpiece is held between the blank holder of the lower die and the upper die insert of the upper die. The lower die punch of the die and the upper die of the upper die cooperate to form the main body of the workpiece. In parallel with this, similarly, when the upper mold is lowered, the cam slider of the upper mold slides by the cam, and the workpiece is sandwiched between the processed surface of the inverse part of the lower punch and the cam slider to form the inverse part. I can do it.

According to a second aspect of the present invention, in the press die of the first aspect, there is provided an urging means for urging the blank holder upward. According to the second aspect of the present invention, for example, by appropriately setting the urging force of the urging member, it is possible to make the pressing force of the workpiece against the wrinkle pressing portion suitable.

According to a third aspect of the present invention, in the press die according to the first or second aspect, the inverse portion of the press product is removed from the processed surface of the inverse portion of the lower die as the upper die rises. A lifter is provided. According to the third aspect of the present invention, the inverse portion of the press product can be automatically removed from the lower die punch by the lifter with the rise of the upper die.

According to a fourth aspect of the present invention, in the press die of the third aspect, the lifter is a resilient member that pushes a base end of a wrinkle holding portion of a pressed product upward. According to the fourth aspect of the invention, by pushing up the base end of the wrinkle holding portion by the resilient member, the inverse portion can be pushed up and the inverse portion can be removed from the lower die punch.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) FIG. 1 is a view schematically showing a cross section of a main part of a press die according to the present invention. In addition,
In the following description, a material before and during press forming is referred to as a workpiece w, and a material after press forming the material is referred to as a pressed product W.

The press die shown in FIG. 1 includes a lower die 10, an upper die 20, and a cam 30, and the lower die 10 is
The upper die 20 includes an upper die 21, an upper die insert 22, and a cam slider 23.

The upper and side surfaces of the lower die punch 11 are formed to have substantially the same shape as the pressed product W shown in FIG. The upper surface has a lower die body processing surface 11a formed corresponding to the inner surface shape of the main body part wa of the pressed product W, and the side surface corresponds to the inner surface shape of the inverse portion wb of the pressed product W. And has an inverse portion processing surface 11b formed substantially in the same shape.

The upper surface of the blank holder 12 is provided with a lower wrinkle pressing surface 12c partially having a ridge 12a. The blank holder 12 is supported by the lower mold 10 so as to be able to move up and down, and a guide hole 12b penetrating vertically is formed on the right end side in the figure. A bush 13 is fitted into the guide hole 12b, and a guide column 31 erected on the lower mold 10 is vertically penetrated through the bush 13 in the vertical direction. The guide column 31 also functions as a support column for supporting the cam 30 described later.

The blank holder 12 is urged upward by an urging member (not shown). When the upper die 10 is raised, that is, when the press machine (not shown) is in a standby state, the lower wrinkles are formed. The pressing surface 12c is configured to be at substantially the same height position as the lower die body processing surface 11a of the lower die punch 11 described above. Also, the blank holder 12
Of the guide column 31 via the bush 13
Is to be guided by

The upper die 21 has an upper die body processing surface 21a having a shape corresponding to the shape of the main part wa of the pressed product W on the lower surface thereof. The upper die 21 descends with a descending operation of a slider (not shown) of the press machine. As will be described later, the upper die body processing surface 21a and the lower die body processing surface 11a of the lower die punch 11 The workpiece w serving as a material is sandwiched between them, and the main body part wa is formed by cooperation of the lower die main body processing surface 11a and the upper die main body processing surface 21a.

The upper die insert 22 is integrally fixed to the upper die 21, and the upper die insert 2
An upper wrinkle holding surface 2 having a shape following the shape of the lower wrinkle holding surface 12c of the blank holder 12 on its lower surface.
2c. A concave portion 22a corresponding to the ridge portion 12a is formed in the upper wrinkle holding surface 22c.

A through hole 22b is formed on the right end of the upper die insert 22 in the vertical direction. The through hole 22 b is formed in the guide hole 1 of the blank holder 12.
2b and a cam 30 which will be described later.
Is set to such a size as to be able to pass freely in the vertical direction.

The upper die insert 22 can move only in the vertical direction integrally with the upper die 21. The upper die insert 22 descends as the upper die 21 descends, and the upper wrinkle holding surface 22c on the lower surface thereof.
And a lower wrinkle holding surface 12 on the upper surface of the blank holder 12.
c, a part of the peripheral portion of the workpiece w
The member c is sandwiched by an appropriate pressing force based on the urging force of the urging member to enable the press forming of the main body part wa and the inverse part wb of the workpiece w.

The cam slider 23 is moved by the upper die 10
The lower die punch 11 is supported so as to be slidable in the left-right direction in the drawing so as to come into contact with and separate from the inverse portion processing surface 11b. The cam slider 23 has, at the lower left portion thereof, an inverse portion processing surface 23b having substantially the same shape as the inverse portion processing surface 11b of the lower die punch 11, and has a diagonally inclined portion at the lower right portion thereof. The slide plate 24 is fixed. The slide plate 24 is rubbed against a cam surface 30a of a cam 30 described later. Cam slider 23
Is a slide plate 2 fixed substantially horizontally to the upper mold 10.
5 is slidably provided in the left-right direction so as to slide on the lower surface of the inverse portion processing surface 11b of the lower punch 11 so as to slide on the lower surface of the lower die 11, and is further provided with a biasing member (not shown). It is urged rightward away from the processing surface 11b.

The cam 30 is fixed to the upper end of the guide column 31 erected on the lower die 10 and has a slide plate 2 on a surface of the cam slider 23 facing the slide plate 24.
4 has a cam surface 30a inclined in the same direction as that of the cam surface 30a. When the cam slider 23 descends as the upper die 10 descends, the cam 30 comes into contact with the cam slider 30 to move the cam slider 23 to the left.

Therefore, in the press die thus configured, the lower die punch 11, the guide post 31, and the cam 30 are integrally formed with the lower die 10, and the blank holder 12 is formed by the lower die 10
Can be moved up and down. On the other hand, the upper die 20 is an upper die 2
1 and the upper die insert 22 are integrally formed with the upper die 20, and the upper die 22 moves up and down integrally with the vertical movement of the upper die 20. Then, only the cam slider 23 can move in the left-right direction. The cam slider 23 descends with the descending operation of the upper die 10, and is moved to the left to approach the inverse processing surface 11 b of the lower die punch 11 by contact with the cam 30 accompanying the descending operation. In other words, downward and leftward movements are combined to move diagonally downward and leftward. On the contrary, the upper mold 1
It is configured to rise in accordance with the upward movement of 0 and to move rightward by urging to the right by the urging member.

Next, the operation of the thus-configured press die will be described.

Raise the slider of the press machine and raise the upper die 10
Is raised to the standby state. In the standby state, the upper die 21, the upper die insert 22, and the cam slider 23 are disposed above, and the cam slider 23 is disposed at the right end position by an urging member. On the other hand, the blank holder 12 is urged upward by the urging member, and the lower wrinkle holding surface 12c on the upper surface thereof is located at substantially the same height position as the lower die body processing surface 11a of the lower die punch 11.

A plate-shaped workpiece w cut into a predetermined shape
Are placed and set on the lower die body processing surface 11a of the lower die punch 11 and the lower wrinkle holding surface 12c of the blank holder 12.

Then, the slider of the press machine is lowered to lower the upper die 20. As the upper die 20 is lowered, the upper die 21, the upper die insert 22, and the cam slider 23 are lowered. Due to this lowering, the wrinkle holding portion wc is sandwiched between the lower wrinkle holding surface 12c of the blank holder 12 urged upward and the upper wrinkle holding surface 22c of the upper die insert 22. In this state, the upper mold 2
When 0 is lowered, the slide plate 24 of the cam slider 23 contacts the cam surface 30a of the cam 30, and the cam slider 23 is moved to the left. In other words, the movement of the cam slider 23 is combined with the downward movement and the leftward movement, and moves diagonally to the lower left.

By the movement of the cam slider 23, the inverse processing surface 23b of the cam slider 23 approaches the inverse processing surface 11b of the lower punch 11, and sandwiches the vicinity of the peripheral edge of the workpiece w. The inverse portion wb is formed by cooperation between the inverse portion processing surface 13b and the inverse portion processing surface 11b of the lower die 11. In parallel with the formation of the inverse portion wb, the central portion of the workpiece w is sandwiched between the upper die body processing surface 21a of the upper die 21 and the lower die body processing surface 11a of the lower die 11. The part wa is formed, and thereafter, the upper die 20 is raised to take out the press product W.

In this manner, the press product W having the main body portion wa, the inverse portion wb, and the wrinkle holding portion wc can be formed in one step including one lowering and raising operation of the upper die 10. What required two steps to form the inverse portion wb can be reduced to one step.

FIG. 1 is a schematic view, and for convenience of explanation, the inverse portion wb is exaggerated in FIG.
2 shows an enlarged view of the actual inverse portion wb. The arrow K in the figure indicates the descending direction of the cam slider 23. As can be seen from the figure, the length A of the inverse portion wb that is bent inward is relatively short.

(Second Embodiment) In the present second embodiment, a description will be given of a case where a lifter is added to the first embodiment. The configuration is the same as that of the first embodiment except for the change of the shape of the lifter and the configuration for installing the lifter. Therefore, the description of the overlapping part will be omitted.

FIG. 3 is a top view, and FIG.
The lifter 40 blank holder 12 is positioned at the position shown in the line sectional view.
Installed in The lifter 40 includes, for example, a pin-shaped member 41 and a compression spring 42 for urging the pin-shaped member 41 upward, as shown in FIG. This is arranged, for example, at a position corresponding to the vicinity of the base end of the wrinkle holding portion wc as shown by a dashed line B in FIG. 2 so that the head of the pin-shaped member 41 projects.

At the time of press forming, the pin-shaped member 41 is retracted downward by the upper die insert 22 via the wrinkle holding portion wc against the urging force of the compression spring 42.

After the press molding is completed, the upper die insert 22 is raised together with the upper die 20, so that the compression spring 42
The wrinkle holding portion wc is pushed up by the urging force of the above.
Thereby, the inverse portion wb of the press product W can be automatically removed from the inverse portion processing surface 11b of the lower die punch 11. Thus, the configuration for removing the inverse portion wb can be simplified.

[0043]

As described above, according to the present invention,
By lowering the upper die relative to the lower die, the wrinkle holding portion of the workpiece is sandwiched between the lower die blank holder and the upper die insert of the upper die, and the lower die lower die punch and the upper die upper die are formed. To form the body of the workpiece. In parallel with this, similarly, when the upper die is lowered, the cam slider slides in the horizontal direction by the cam, and the workpiece is sandwiched between the processed surface of the inverse portion of the lower die punch and the processed surface of the inverse portion of the cam slider. Can be formed, and a pressed product can be formed together with the main body.

When the upper die is raised after the press product is formed, the upper die can be separated from the press product,
All of these operations can be completed in one step of lowering and raising the upper die relative to the lower die. That is, what was conventionally performed in two steps can be performed in one step,
Equipment and processing man-hours can be reduced.

Further, as the upper die is raised, the inverse part of the pressed product can be automatically removed from the lower punch by a lifter having a simple structure, so that the structure and operation for removal can be simplified. It is a great contribution to the production of a pressed product having an inverse portion.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a cross section of a main part of a press die according to a first embodiment of the present invention.

FIG. 2 is an enlarged view showing an actual shape near an inverse portion.

FIG. 3 is a top view showing an arrangement position of a lifter according to a second embodiment.

FIG. 4 is a sectional view taken along line YY of FIG. 3;

FIG. 5 is an explanatory diagram illustrating a configuration of a lifter.

FIG. 6 is a top view illustrating a press product.

FIG. 7 is a sectional view taken along line XX of FIG. 6;

FIG. 8 is an explanatory view showing a conventional process of processing an inverse portion.

FIG. 9 is an explanatory view showing another conventional process of the inverse portion processing.

[Explanation of symbols]

 Reference Signs List 10 Lower die 11 Lower die punch 11a Lower die body processing surface 11b Inverse part processing surface 12 Blank holder 12c Lower wrinkle holding surface 20 Upper die 21 Upper die 21a Upper die body processing surface 22 Upper die insert 22c Upper wrinkle holding surface 23 Cam slider 23b Inverse part processing surface 30 Cam 30a Cam surface W Press product w Workpiece wa Body part wb Inverse part wc Wrinkle holding part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Satoshi Tamura 1-7-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Inside Fuji Heavy Industries Ltd. (72) Inventor Yasuhiro Watanabe 1-72, Nishi-Shinjuku, Shinjuku-ku, Tokyo No. Fuji Heavy Industries, Ltd. (72) Inventor Osamu Mori 1-7-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo F-term in Fuji Heavy Industries, Ltd. 4E063 AA01 BA01 CA06 CA20 MA18

Claims (4)

[Claims] 1. A lower die and an upper die attached to a press machine, and a plate-shaped workpiece set on the upper surface of the lower die is moved downward by the upper die to form a peripheral portion of the workpiece. In a press die for forming a press product having an inverse portion bent inward from the lowering direction of the upper die, the lower die has a shape corresponding to a shape of a main body portion excluding the inverse portion in the press product. A lower die punch having a die body processing surface, an inverse processing surface formed on the side of the lower die body processing surface and having a shape corresponding to the inner surface shape of the inverse portion, and the inverse portion of the lower die punch A blank holder having a lower wrinkle pressing surface having a shape corresponding to an inner surface shape of a wrinkle pressing portion which is arranged adjacent to a processing surface and continuously extends outward from a tip of the inverse portion of the press product; An upper die having a lower die body processing surface for forming a main body portion of the pressed product in cooperation with a lower die body processing surface of the lower die punch; and An upper die insert having an upper wrinkle pressing surface integrally formed and having a wrinkle pressing portion of the press product cooperating with a lower wrinkle pressing surface of the blank holder; and an inverse portion processing surface of the lower die punch. A cam slider for forming the inverse portion in cooperation with the inverse portion processing surface, the cam slider being supported by the upper die so as to be slidable in a substantially horizontal direction that comes into contact with and separated from the upper die, and with the lowering of the upper die. A press die comprising a cam for sliding the descending cam slider in a substantially horizontal direction close to the inverse portion processing surface. 2. The press die according to claim 1, further comprising an urging means for urging the blank holder upward. 3. The lifter according to claim 1, further comprising a lifter for removing an inverse portion of the press product from an inverse portion processing surface of the lower die as the upper die rises. Press mold. 4. The press die according to claim 3, wherein the lifter is a resilient member that pushes up a base end of a wrinkle holding portion of the press product.