JPH10328762A - Combined press die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the expenditure of a die and to simplify the maintenance of the die, etc., by making one set of press die possible to execute plural kinds of working such as drawing, punching and bending. SOLUTION: An upper die 3 supported movably in the press direction with a ram 2, an upper knife 10 having a blank holder 10a, a punching knife 10b and a bending knife 10c, supported movably in the press direction with the upper die 3, a lower die 5, a 1st lower knife 20 having a blank holder and a punching knife 20a and a 2nd lower knife 30 having a blank holder 30a both supported respectively movably in the pressing direction with the lower die 5, are provided, when the ram 2 is moved down one time, drawing executed between the upper die 3 and the lower die 5, punching executed between the punching knife 10b of the upper knife 10 and the punching knife 20a of the 1st lower knife 20, and bending executed between the bending knife 10c of the upper knife 10 and the lower die are executed continuously.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press die for performing a plurality of forms of press working such as drawing, punching and bending.

[0002]

2. Description of the Related Art In general, when performing various types of press working as described above, dedicated press dies are prepared for each working form, and each is performed as a separate step.

[0003]

As a result, the number of molds must be increased because dedicated press dies must be prepared according to each processing mode. As a result, not only the cost of the molds is increased, but also much labor is required for the maintenance. And there is a problem that storage space for a plurality of molds is required for one part. Further, it is necessary to move the work between the respective steps in order to perform a series of press working, and as a result, there is a problem that a conveying means such as a conveyor, a loader and an unloader is required.

The present invention has been made in view of such a conventional problem, and has as its object to provide a press die capable of performing a plurality of press workings with one set of an upper die and a lower die. .

[0005]

According to a first aspect of the present invention, there is provided a composite press die, comprising: an upper die supported on a ram so as to be displaceable in the press direction; and a wrinkle supported on the upper die so as to be displaceable in the press direction. An upper blade having a presser, a punching blade, and a bending blade, a lower die, a first lower blade having a punching blade, each of which is supported to be displaceable in the press direction with respect to the lower die, and a second having a wrinkle presser. A lower blade, wherein a single downward movement of the ram causes a drawing process to be performed between the upper die and the lower die; and a cutting blade of the upper blade and a cutting blade of the first lower blade. And the bending performed between the bending blade of the upper blade and the lower die are continuously performed.

According to this composite press die, the drawing, punching, and bending processes are performed on the material only by moving the ram down once, so that a plurality of forms of press processing can be performed with one set of press die. This can reduce mold cost, simplify mold maintenance, and the like.

[0007] The composite press die according to the second aspect is the first aspect of the invention.
The composite press die according to claim 1, wherein a gas spring that operates on a contraction side with a pressing force larger than a clamping force required for drawing is interposed between the upper die and the ram, and a first lower blade and a bolster are provided. And a gas spring that operates on the contraction side with a pressing force larger than the clamping force required for the punching process.

According to this composite press die, before drawing, the upper die moves down integrally with the ram, and after drawing, the ram moves down due to a larger clamping force, so that a gas spring for the upper die is formed. Operates on the contraction side to displace the upper die with respect to the ram, thereby performing the punching process. After punching,
When the ram moves down with a larger clamping force, the gas spring for the lower blade operates to the contraction side, and the first lower blade moves downward, whereby bending is performed.

As described above, the ram moves downward while gradually increasing the mold clamping force, so that the position of the upper die with respect to the ram and the position of the first lower blade with respect to the lower die change, thereby drawing. , Punching and bending are performed, thereby obtaining the same effect as the above, such as reduction in die cost,
In particular, a plurality of forms of press working can be realized by one set of press dies without performing a switching operation or the like.

According to a third aspect of the present invention, there is provided a composite press die having an upper die supported on a ram so as to be displaceable in the press direction, and a wrinkle presser, a punching blade, and a bending blade supported on the ram so as to be displaceable in the press direction. An upper blade, an upper die punching device for switching an amount of displacement of the upper die with respect to the ram, a lower die, and a first blade having a punching blade supported to be displaceable in the press direction with respect to the lower die. A lower blade, a second lower blade having a wrinkle presser, and a lower die punching device for switching a displacement amount of the first lower blade with respect to the lower die; The drawing process is performed between the upper die and the lower die, and the second downward movement of the ram performed in a state where the upper die punching device and the lower die punching device are switched to the displacement restriction releasing side, Between the cutting blade of the upper blade and the cutting blade of the first lower blade In conjunction with punching it is performed, and characterized by being configured with the bending to be made between the bending blade and the lower mold of the upper blade is made.

[0011] According to this composite press die, the upper die punching device and the lower die punching device are switched to the displacement regulating side, the upper die is moved down integrally with the ram, and the first lower blade cannot be moved down. By doing so, the material is drawn while its peripheral edge is held. By switching the upper and lower die punching devices to the displacement restriction releasing side, the upper die can be displaced relative to the ram further above the drawing level, and the first lower blade is the lower die In this state, the ram is again moved downward below the drawing level, and the upper die is displaced upward with respect to the ram. The material is cut out between the blade and the ram, and the upper blade and the first blade are moved downward.
By lowering the lower blade integrally, the peripheral edge of the material punched between the bending blade of the upper blade and the lower die is bent.

As described above, the upper die punching device for switching the displacement of the upper die and the lower die punching device for switching the displacement of the first lower blade are provided. By switching to the release side, a plurality of forms of press working using one set of press dies can be realized.

According to a fourth aspect of the present invention, there is provided a composite press die.
The composite press die described in the above, wherein the upper die punching device and the lower die punching device move the punching plate in a direction orthogonal to the pressing direction by an actuator, and displace the upper die with respect to the ram, Characterized in that the displacement amount of the first lower blade is switched with respect to.

According to this composite press die, the displacement amount of the upper die and the displacement amount of the first lower blade can be switched with a simple configuration, whereby reliable switching without operation failure can be performed. .

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a stage in which drawing, punching, and bending have been completed by the composite press die 1 of the first embodiment described below, in which the ram 2 has reached the lower end. With the composite press die 1 of the present embodiment, an automobile door outer panel is manufactured as a product. That is, a flat material W is drawn to obtain a curved surface shape required for the door outer panel, the outer shape is sheared to a predetermined size by punching, a window is formed in an opening, and the outer periphery is further formed by bending. A hemming flange is formed. The door outer panel as a product is an example, and it goes without saying that the composite press mold 1 described below can be applied to a composite press for manufacturing other products.

The composite press die 1 of this embodiment is mainly composed of an upper die 3 supported on the lower surface of the ram 2 and a lower die 5 mounted on the upper surface of the bolster 4. The upper die 3 is provided with vertically long groove portions 3a to 3
By inserting the support pins 2a to 2a on the ram 2 side into the ram 2 respectively, the ram 2 is supported so as to be displaceable within a certain range in the pressing direction (vertical direction in the drawing).

Between the ram 2 and the upper die 3, an upper die punching device 6 is incorporated. This upper stamping device 6
Is for switching the amount of displacement of the upper die 3 with respect to the ram 2 in two stages, and the base 6a attached to the lower surface of the ram 2
Next, the split plate 6b is pressed through the guide rails 6c, 6c in the direction of its plane (in FIG. 1, the direction perpendicular to the plane of FIG.
(In the left-right direction). The sliding operation of the punching plate 6b is performed by a punching cylinder 6e attached to the lower surface of the base 6a as shown in FIG. This punching plate 6
Brick holes 6d to 6d are formed at predetermined positions of b.

On the other hand, the upper surface of the upper die 3 has a displacement regulating pin 3b.
3b (only one portion is shown in the figure) is provided in a projecting manner upward, and the displacement control pins 3b to 3b are brought into contact with the lower surface of the punching plate 6b (displacement control).
Alternatively, the displacement amount of the upper die 3 with respect to the ram 2 can be switched in two stages depending on whether the upper die 3 is inserted into the punching holes 6d to 6d (displacement restriction release). That is, when the punching plate 6b is slid by the operation of the punching cylinder 6e to position the punching holes 6d above the displacement regulating pins 3b to 3b, the displacement of the upper die 3 with respect to the ram 2 increases. .

In the mold open state, the upper mold 3 is displaced to the lowermost position with respect to the ram 2 by its own weight. At this time, a certain gap is provided between the displacement regulating pins 3b to 3b and the punching plate 6b. Is formed. Accordingly, the upper mold 3 is displaced upward by a fixed amount relative to the ram 2 with the downward movement of the ram 2 (a state in which the upper mold 3 does not move downward even when the ram 2 moves downward). When the displacement regulating pins 3b to 3b strike the hitting plate 6b by sliding the 6b, the relative displacement of the upper die 3 with respect to the ram 2 is prevented thereafter, and the ram 2 and the upper die 3 move downward integrally. On the other hand, the punching device 6 is switched to the displacement restriction release side, and the displacement regulating pins 3b to 3b enter the punching holes 6d to 6d, so that the upper die 3 is further displaced relative to the ram 2 further upward.

Urethane rubbers 3c to 3c are attached at appropriate positions on the upper surface of the upper mold 3, and the displacement of the upper mold 3 with respect to the ram 2 in the state where the displacement regulation is released is caused by deforming the urethane rubbers 3c to 3c. Thus, the shocking displacement is suppressed.

Next, an annular upper blade 10 is suspended around the upper die 3. This upper blade 10
Although not shown, similar to the support structure for the ram 2 of the upper die 3, the support pins of the upper die 3 are inserted into vertically long grooves provided at appropriate places around the upper blade 10. The upper die 3 is supported so as to be displaceable vertically within a certain range. Displacement restricting pins 11 to 11 are provided at appropriate positions on the upper surface of the upper blade 10 at appropriate intervals in the circumferential direction.
Are provided so as to protrude upward. The displacement regulating pins 11 to 11 penetrate the displacement regulating surface 3d of the upper die 3 and are directed to the punching plate 6b. When the ram 2 is moved downward, the displacement regulating pins 11 to 11 come into contact with the lower surface of the punching plate 6b. It has become.

In the mold open state (the rising end position of the ram 2),
The upper die 3 is located at the lower displacement position with respect to the ram 2 by its own weight, and the upper blade 10 is located at the lower displacement position with respect to the upper die 3 by its own weight. A fixed gap is formed between the punching plate 6b and a fixed gap between the flange surface 11b constituting the attachment portion of the displacement control pin 11 to the upper blade 10 and the displacement control surface 3d of the upper die 3, respectively. .

On the lower surface side of the upper blade 10, a wrinkle presser 10a for drawing, a punching blade 10b for outer shape punching,
The bending blades 10c for bending the outer peripheral flange are respectively formed over the entire circumference.

On the inner side of the press surface of the upper die 3, a material W
A window punching blade 12 for punching a window is provided in a suspended shape. The window cutting blade 12 is supported by the support shaft 14 so as to be vertically displaceable with respect to the upper die 3 within a certain range, and is urged by a compression spring 13 in a direction to be constantly lifted upward. Displacement regulating pins 15 are also mounted on the upper surface of the window cutting blade 12 so as to protrude upward, and are directed to the punching plate 6b. In the mold open state, the displacement regulating pin 15
A certain gap is formed between the plate and the punching plate 6b.

Next, around the lower die 5, a first lower blade 20 and a second lower blade 30 each having an annular shape are arranged. The second lower blade 30 is arranged on the outer peripheral side of the first lower blade 20. On the upper surface side of the first lower blade 20, a punching blade 20a corresponding to the punching blade 10b of the upper blade 10 is provided. On the upper surface side of the second lower blade 30, a wrinkle presser 10a of the upper blade 10 is provided. A corresponding wrinkle presser 30a is provided.

The first lower blade 20 is constantly urged upward through the gas springs 21 to 21 disposed at appropriate intervals in the circumferential direction on the base 52 of the lower die punching device 50. Supported. Also, the first lower blade 20
On the lower surface, apart from the gas springs 21 to 21,
A plurality of displacement regulating pins 22 to 22 are provided to protrude downward. Each of the displacement regulating pins 22 to 22 is directed to the punching plate 51 of the lower die punching device 50.

The second lower blade 30 is supported at a plurality of places at appropriate intervals in the circumferential direction by cushion pins 31 to 31 on the die cushion side (not shown), and is constantly urged upward in a bolster. 4 supported. An auxiliary pin 31a is interposed between the cushion pins 31 to 31 and the second lower blade 30. The upward biasing force of the gas springs 21 to 21 and the upward biasing force (supporting force) of the cushion pins 31 to 31 are stronger than the total load of the weight of the upper die 3 and the weight of the upper blade 10.
Is set smaller than the lower power. Therefore, the first and second lower blades 20 and 30 do not move downward merely by being mounted on the upper blade 10, and the upper surface 11 of the displacement regulating pin 11 does not move.
a moves down when the upper blade 10 moves down integrally with the ram 2 by hitting against the striking plate 6b.

The lower punching device 50 is provided on the upper surface of the bolster 4. This lower die punching device 50 includes:
A plurality of punching plates 51 to 51 are provided on the upper surface of the base 52.
Are supported so as to be slidable in the plane direction, and the positions of the respective punching plates 51 to 51 are changed (a punching operation) by a punching cylinder 51b as shown in FIG. Each punching plate 51-5
At a predetermined position on the upper surface of one, an appropriate number of separate convex portions 51a to 51a are formed. The punching device 5
When 0 is switched to the displacement regulation side, each of the convex portions 51a
51a are located below the displacement restricting pins 22-22, whereby the respective displacement restricting pins 22-22 strike the striking convex portion 51a to restrict the downward movement of the first lower blade 20.

A receiving blade 25 is arranged inside the press surface of the lower die 5 in correspondence with the window cutting blade 12 on the upper die 3 side. The receiving blade 25 is also constantly urged upward by the compression spring 26. A displacement regulating pin 27 is provided on the lower surface of the receiving blade 25.
Are provided so as to protrude downward, and the displacement regulating pins 27 are also directed to the punching plate 51 of the lower die punching device 50. In correspondence with the displacement regulating pin 27, the punching projection 5 is formed on the upper surface of the punching plate 51.
1a is formed. When the lower die punching device 50 is switched to the displacement restricting side, the displacement of the first lower blade 20 is restricted as described above, and the convex pressing is also performed below the displacement restricting pin 27 of the receiving blade 25. By the position of the portion 51a, the downward movement of the receiving blade 25 is also restricted.

When the punching cylinder 51b is operated in the reverse direction to switch the lower die punching device 50 to the side where the displacement restriction is released, the lower part of the first lower blade 20 below the displacement restricting pins 22-22 and the receiving blade 25 are moved. Each of the striking convex portions 51a to 51a retreats from below the displacement regulating pin 27, whereby the first
The lower movement of the lower blade 20 and the receiving blade 25 is allowed, or the lower blade 20 and the receiving blade 25 can be displaced to a lower position.

Next, using the composite press die 1 according to the present embodiment configured as described above, drawing (FIG. 4), punching (FIG. 5), and flange bending of the outer periphery (FIG. 4) of the material W are performed. 6) will be described. First, the material W is set on the second lower blade 30 in the mold opening state (not shown). In this mold open state, the ram 2 is located at the rising end,
The upper die 3 is located at a lower end with respect to the ram 2 by its own weight, and the upper blade 10 is located at a lower end with respect to the upper die 3 by its own weight.

In performing the composite press working in the following procedure, the upper punching device 6 is provided with a displacement regulating side (a punching hole 6d from above the displacement regulating pin 3b) for regulating the displacement of the upper die 3.
Is displaced, and the displacement regulating pins 3b
b) (see FIG. 4).
However, in this opened state, a certain gap is formed between the displacement regulating pins 11 to 11 and the displacement regulating pins 3b to 3b and the punching plate 6b. On the other hand, the lower punching device 50 is also switched to the side that regulates the downward movement of the first lower blade 20.

First, as shown in FIG. 4, the material W is pressed and wrinkled. That is, after the material W is set in the mold open state, the downward movement of the ram 2 is started, and the peripheral edge of the material W is positioned between the wrinkle presser 10a of the upper blade 10 and the wrinkle presser 30a of the second lower blade 30. It is sandwiched. At this stage, the first and second lower dies 20, 30 do not descend. As the ram 2 descends, the upper die 3 further descends, and the flange surface 11b of the displacement regulating pin 11 contacts the displacement regulating surface 3d of the upper die 3, after which the ram 2 further descends and the upper blade 10 When the upper surface 11a of the displacement regulating pin 11 abuts against the split plate 6b, the upper blade 10 is pushed by the ram 2 and descends.

The wrinkle presser 10a of the upper blade 10 and the second lower blade 3
When the upper blade 10 is pushed down by the ram 2 in a state where the material W is sandwiched between the material W and the wrinkle presser 30a of 0,
The second lower blade 30 is slightly lowered. On the other hand, as shown, at this stage, the lowering operation of the upper blade 10 is directly performed by the first lower blade 20.
, The first lower blade 20 does not descend, and therefore only the second lower blade 30 descends. By lowering only the second lower blade 30, the peripheral edge of the material W is wrinkled (clinched) between the first and second lower blades 20, 30 and the upper blade 10.

Immediately after the material W is wrinkled,
The displacement regulating pins 3b to 3b strike the striking plate 6b as shown in the figure, and thereafter the upper die 3 moves downward integrally with the ram 2, whereby the material W is moved between the upper die 3 and the lower die 5.
Is drawn.

After the completion of the drawing, the ram 2 is returned to the raised end position, and the mold is opened. In this mold open state, the upper die punching device 6 and the lower die punching device 50 are each switched to the displacement regulation release side. That is,
By operating the punching cylinder 6e in the upper die punching device 6, the punching plate 6b is moved in a direction perpendicular to the plane of FIG.
The punching holes 6d to 6d are located above the b to 3b, so that the upper die 3 can be displaced upward with respect to the ram 2. Note that the displacement regulating pins 11 to 11 and the urethane rubbers 3c to 3c are still held in a state of contacting the lower surface of the punching plate 6b.

On the other hand, in the lower punching device 50,
By the operation of the punching cylinder 51b, each of the punching plates 51 to 51 moves to the side where the displacement regulation is released, whereby the displacement regulating pins 22 to 22 of the first lower blade 20 and the displacement regulating pin 27 of the receiving blade 25 are moved. Of each of the striking convex portions 51a to 51a from below the first lower blade 2
0 and the receiving blade 25 can be displaced downward with respect to the lower mold 5. In this opened state, the second lower blade 30 is lifted by the cushion pins 31 to 31, so that the material W is lifted by the second lower blade 30 and once floated from the lower die 5. ing.

After the upper die punching device 6 and the lower die punching device 50 are switched to the side where the displacement regulation is released, the ram 2 is lowered again to perform the punching and bending of the material W. That is, during the lowering of the ram 2, the upper blade 10 first contacts the second lower blade 30 and the peripheral edge of the material W is sandwiched again. At this stage, only the own weight of the upper blade 10 is added to the second lower blade 30, so that the second lower blade 30
Does not descend, and the first lower blade 20 also does not descend because it is supported by the gas springs 21 to 21. Therefore, the lowering of the upper blade 10 is temporarily stopped at this stage.

When the ram 2 further descends, the displacement regulating surface 3d of the upper die 3 comes into contact with the flange surface 11b of the upper blade 10, and
Next, the respective displacement regulating pins 11 to 11 and the urethane rubber 3c
3c contact the lower surface of the punching plate 6b. Accordingly, the ram 2 and the upper blade 10 are then lowered integrally, whereby the second lower blade 30 is lowered. On the other hand, since the displacement regulating pins 3b to 3b of the upper mold 3 respectively enter the punching holes 6d, the upper mold 3 is still displaced with respect to the ram 2. However, since the urethane rubbers 3c to 3c abut against the split plate 6b, the downward movement of the ram 2 is transmitted to the upper mold 3 via the urethane rubbers 3c to 3c. Between the two dies 3 and 5 by the elastic force of the urethane rubbers 3c to 3c. For this reason, the upper die 3 does not move down in the punching and bending operations to be performed below, so that the ram 2 moves further downward while deforming the urethane rubbers 3c to 3c. The displacement restricting pins 3b to 3b gradually enter the hole 6d.

As described above, the upper blade 10 and the second lower blade 30 are lowered in a state where the first lower blade 20 is not lowered, and as shown in FIGS.
0b is displaced downward with respect to the punching blade 20a of the first lower blade 20, whereby the outer periphery of the material W is punched.

When the displacement regulating pin 11 of the upper blade 10 comes into contact with the punching plate 6b, the displacement regulating pin 15 of the window punching blade 12 also comes into contact with the punching plate 6b. The blade 12 also moves down integrally with the ram 2. On the other hand, at this stage, the lower punching device 50 is switched to the displacement restriction release side, and the receiving blade 25
Is in a state where it can be moved down. Accordingly, with the downward movement of the ram 2, the window cutting blade 12 also moves downward integrally, and further moves downward while pressing down the receiving blade 25 against the compression spring 26 in a state of contacting the material W. A window is punched out of the material W.

After the completion of the punching, the ram 2 is further lowered, and as shown in FIG.
Between the upper blade 10 and the first and second lower blades 20,
30 moves down integrally with the ram 2. In this way, the upper blade 10 further moves downward, so that the bending blade 1 of the upper blade 10
Between the lower die 0c and the lower mold 5, the outer periphery of the blank W is flanged downward.

As described above, according to the press die 1 of the present embodiment, the material W is drawn by the first downward movement of the ram 2, and the blanking and bending are performed by the second downward movement. Since a plurality of forms of press working can be performed by one set of press dies 1, it is possible to reduce the cost of the mold and the maintenance labor as compared with the related art, and
It is possible to eliminate the conventional transport means between each step.

Various modifications can be made to the above-described embodiment. FIG. 8 shows a composite press die 60 according to a second embodiment of the present invention. Members that are the same as in the first embodiment and do not require any particular changes are not described, and the same reference numerals are used. Unlike the first embodiment, the composite press die 60 according to the second embodiment has a configuration in which drawing, punching, and bending are performed by one downward movement of the ram 2.

As shown in FIG. 8, on the upper surface of the upper die 3, the displacement regulating pins 3b to 3b and the urethane rubbers 3c to 3c are provided.
A plurality of gas springs 61 to 61 are attached in place of c, and each of the gas springs 61 to 61 strokes to the reduction side with a load of a certain level or more. That is, each of the gas springs 61 to 61 that operates on the reduction side when a pressing force larger than the mold clamping force required for drawing is applied is used. For this reason, the upper stamping device 6
In the case of the second embodiment, the displacement regulating pins 11 to 11 and the gas springs 61 to 61
Abuts against a contact plate 66 fixed to the lower surface of the ram 2.

The receiving blade 25 for punching the window of the material W is also provided with the displacement regulating pin 27 and the compression spring 2.
6 is supported by the lower mold 5 by gas springs 62 to 62. The gas spring 62 also operates on the contraction side when a load exceeding a certain level, that is, the clamping force required for the blanking of the material W is applied, and does not operate with the clamping force during drawing.

Further, the first lower blades 20 arranged around the lower die 5 are all gas springs 64 to 64 instead of the displacement regulating pins 22 and the gas springs 21 to 21.
Therefore, in the second embodiment, the lower die punching device 50 is also eliminated. In this case, the gas springs 64 to 64 are
There is used one that does not operate with a load larger than 1 to 21, that is, a mold clamping force at the punching stage, and operates on the reduction side when a mold clamping force required for bending is added.

As described above, by using the gas springs 61 to 61, 62 to 62, and 64 to 64 instead of the upper and lower die punching devices 6 and 50 in the first embodiment, drawing and punching can be performed. Processing and bending 1
In the case of the second embodiment, all the machining can be performed by one downward movement, instead of moving the ram 2 down twice as in the first embodiment. It can be carried out.

Hereinafter, the processing procedure will be briefly described. The ram 2 moves downward, and the material W is sandwiched between the upper blade 10 and the second lower blade 30. First and second lower blades 20, 30
Are supported by the gas springs 64 to 64 and the cushion pins 31 to 31, respectively, so that the lower blades 20, 30 do not move down at this stage.

Further, when the ram 2 moves downward, the upper surface 11a of the displacement regulating pin 11 comes into contact with the contact plate 66, and thereafter the upper blade 10 moves downward integrally with the ram 2, and at this stage, the second lower blade 30 moves downward against the cushion pins 31 to 31, whereby the periphery of the material W is clinched. When the material W is clinched in this manner, the gas spring 61 is almost simultaneously.
61 abut against the contact plate 66, whereby the upper mold 3
Moves downward integrally with the ram 2, and the material W is drawn between the lower die 5. At this stage of drawing, the gas springs 61 to 61 do not operate on the reduction side. After drawing is completed,
If the ram 2 further moves down due to an increase in the mold clamping force, the upper mold 3 cannot move down at this stage.
A predetermined load or more is applied to the gas springs 61 to 61, whereby the gas springs 61 to 61 operate to the reduction side, and the ram 2 is allowed to move down independently.

On the other hand, when the ram 2 further moves down after drawing, the first lower blade 20 does not move down, but the second lower blade 30 is pushed by the ram 2 and the upper blade 10 to move down. Accordingly, the punching blade 10b of the upper blade 10 is displaced with respect to the punching blade 20a of the first lower blade 20, whereby the outer periphery of the material W is punched.

Also, at this stage, since the displacement regulating pin 15 contacts the contact plate 66, the window cutting blade 12 also descends integrally with the ram 2, and a certain load or more is applied to the receiving blade 25. As a result, the gas springs 62 to 62 operate to the reduction side, and the receiving blade 25 is allowed to move downward. Therefore, when the ram 2 moves down, the window cutting blade 12 and the receiving blade 25
Moves downward with the material W interposed therebetween, whereby the material W
The window portion is also punched almost simultaneously.

After the completion of the punching process, the punching blade 10a of the upper blade 10
Comes into contact with the extraction blade 20a of the first lower blade 20, the ram 2
The lower power (clamping force) is directly applied to the first lower blade 20 to apply a certain load or more to each of the gas springs 64 to 64, whereby each of the gas springs 64 to 64 operates on the reduction side. Then, the first lower blade 20 moves down integrally with the ram 2.

Thus, the first and second lower blades 20, 30
When the upper blade 10 and the upper blade 10 move downward integrally, the peripheral edge of the blanked material W is bent downward at a substantially right angle by the bending blade 10c of the upper blade 10.

As described above, according to the press die 60 of the second embodiment, drawing, punching, and bending are performed by one set of the press die 60. In the present embodiment,
Unlike the first embodiment, the three types of press working are sequentially performed by one downward movement of the ram 2. Thus, in addition to the function and effect of the press die 1 of the first embodiment, the press die 60 can shorten the cycle time of press working as compared with the press die 1 of the first embodiment.

The first and second embodiments described above can be implemented with further modifications. For example, in the illustrated embodiment, the description has been given as the press dies 1 and 60 for pressing the door panel of the automobile.
It goes without saying that it can be applied when pressing various types of products, and therefore can be applied with or without window punching.

In the first embodiment, a cylinder is used as a driving means for moving the two punching plates 6b, 51. However, the position may be switched by another means such as an electric motor.

[Brief description of the drawings]

FIG. 1 is a view showing a press die according to a first embodiment of the present invention, and is a longitudinal sectional view of the entire press die at the time when all press workings (drawing, punching and bending) are completed. .

FIG. 2 is a side view of the upper die punching device.

FIG. 3 is a side view of the lower stamping device.

FIG. 4 is a longitudinal sectional view of a main part of the press die according to the first embodiment at the time when drawing is completed.

FIG. 5 is a longitudinal sectional view of a main part of the press die according to the first embodiment at the time when the punching is completed.

FIG. 6 is a longitudinal sectional view of a main part of the press die according to the first embodiment at the time when the bending process is completed, and is a partially detailed view of FIG. 1;

FIG. 7 is a detailed view of a main part of a press die immediately before punching.

FIG. 8 is a view showing a press die according to a second embodiment of the present invention, and is a longitudinal cross-sectional view of the entire press die at the time when all press workings (drawing, punching, and bending) are completed. .

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Composite press type | mold (1st Embodiment) 2 ... Ram 3 ... Upper type, 3b ... Displacement control pin 4 ... Bolster 5 ... Lower type 6 ... Upper type punching device, 6b ... Pressing plate, 6d
... punching hole 10 ... upper blade, 10a ... wrinkle holder, 10b ... punching blade, 10
c: Bending blade 11: Displacement regulating pin 12: Window removal blade 20: First lower blade, 20a: Removal blade 21: Gas spring 22: Displacement restriction pin 30: Second lower blade, 30a: Wrinkle holder 31 Cushion pin 50 ... Lower punching device 51 ... Pressing plate, 51a ... Pressing protrusion 60 ... Composite press die (2nd embodiment) 61,62,64 ... Gas spring

Claims (4)

[Claims] 1. An upper die supported on a ram so as to be displaceable in a press direction, and an upper die supported on the ram so as to be displaceable in a press direction.
An upper blade having a wrinkle retainer, a punching blade, and a bending blade, a lower die, and each supported in such a manner that the lower die can be displaced in the press direction.
A lower blade having a first lower blade having a punching blade and a second lower blade having a wrinkle retainer, and a drawing operation performed between the upper die and the lower die by one downward movement of the ram; , The cutting blade of the upper blade and the first
Wherein a punching process performed between the lower blade and the lower blade is continuously performed, and a bending process performed between the bending blade of the upper blade and the lower die is continuously performed. Type. 2. The composite press die according to claim 1, wherein:
A gas spring that operates on the contraction side with a pressing force larger than the clamping force required for drawing is interposed between the upper die and the ram, and is required for punching between the first lower blade and the bolster. A composite press die characterized by interposing a gas spring that operates on the contraction side with a pressing force larger than the mold clamping force. 3. An upper die supported on the ram so as to be displaceable in the press direction, and an upper die supported on the ram so as to be displaceable in the press direction.
An upper blade having a wrinkle retainer, a punching blade, and a bending blade, an upper die punching device for switching a displacement amount of the upper die with respect to the ram, a lower die, and a press direction displaceable relative to the lower die. A first lower blade having a punching blade, a second lower blade having a wrinkle presser, and a lower die punching device for switching a displacement amount of the first lower blade with respect to the lower die; By the first downward movement of the ram, drawing is performed between the upper die and the lower die, and the upper die and the lower die are switched to the displacement restriction releasing side. By the second downward movement of the ram, a punching process is performed between the punching blade of the upper blade and the punching blade of the first lower blade, and between the bending blade of the upper blade and the lower die. Composite press characterized in that it is configured to be bent by Type. 4. The composite press die according to claim 3, wherein
The upper die punching device and the lower die punching device move the punching plate in a direction perpendicular to the pressing direction by an actuator, and displace the upper die with respect to the ram and the displacement of the first lower blade with respect to the lower die. A composite press die characterized in that it is configured to switch between.