JP2004122201A - Press die - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a press die for allowing smooth motion of a flying cam with a simple configuration at a low cost. <P>SOLUTION: A guide cam 4 having a work edge bending blade 5 on a lower die 2 is provided adjacent to a work receiving table 14, a bending blade 9 to bend a work edge is provided in contact with the bending blade 5 of the guide cam 4 on an upper die 1, a flying cam 6 having a cam follower 8 which is swingably supported like a pendulum in a vicinity of a pad 3 so as to be advanced/retracted to/from the guide cam 4 is provided, and a driver 10 having a guide plate 11 in which the cam follower 8 of the flying cam 6 is brought into contact with the lower die 2 according as the upper die 1 is lowered, and the flying cam 6 is swung in the direction of the guide cam 4 is disposed in a vicinity of the guide cam 4. The flying cam 6 is urged in a direction retracting from the guide cam 4 by a flying cam returning means. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a press die for bending a work edge.
[0002]
[Prior art]
[Non-Patent Document] FIG. 5 shows a general press die for bending a work edge.
Japanese Patent Application Laid-Open No. H11-10234 discloses a press die for bending an edge of a work with an upper suspension cam.
[0003]
The press die shown in FIG. 5 includes a lower die 2 having a work receiving table 26, and an upper die 1 having a pad 3 which is lowered with respect to the lower die 2 and presses the work carried into the work receiving table 26. In the press die, a guide cam 20 having a bending edge 21 at the edge of the work is provided adjacent to the work receiving table 26 on the lower die 2, and slides on the guide cam 20 in a horizontal direction to slide the guide cam 20. A bending cam 24 that bends the edge of the workpiece with a bending blade 24 that is in contact with the bending blade 21 is provided. A driver that causes the upper die 1 to contact the guide cam 20 and the processing cam 23 to move the processing cam 23 forward is provided. The work cam 23 is configured to bend the work edge by moving the work cam 23 forward.
In the press die disclosed in Japanese Patent Application Laid-Open No. H11-10234, a pad 16 is provided on an upper die 10 and an upper suspension cam 14 provided with a leading member 30 near the pad 16 is slidable by a guide mechanism. The lower mold 20 is provided with a work receiving table 24 and a rotary cam 26 for guiding the work to a bending position. The lower cam 10 lowers the rotary cam 26 to guide the work to the bending position. Is advanced along a guide plate 27 provided on the preceding member 30 via a roller to bend the work edge.
[0004]
[Problems to be solved by the invention]
In the press die shown in FIG. 5, the lower die 2 is provided with a guide cam 20 having a bending edge 21 at the edge of the work adjacent to the work receiving table 26, and slides on the guide cam 20 in a horizontal direction. Since the guide cam 20 is provided with the processing cam 23 for bending the edge of the work by the bending blade 24 which is in contact with the bending blade 21, the structure is complicated and the cost is high, and the guide cam 20 and the processing cam 23 are formed. As a result, the press mold is made large, and a large mold storage area is required.
Further, the press mold disclosed in Japanese Patent Application Laid-Open No. H11-10234 has a compact mold form by an upper suspension cam structure, and solves the problems of the press mold shown in FIG. 5 described above. Due to the structure in which the guide mechanism slides and reciprocates by surface contact, there is a problem in the smoothness of the upper suspension cam reciprocating operation which moves along the guide plate 27 due to the sliding resistance. The total weight of the upper mold is increased by the weight of the guide mechanism such as a lump of metal, and the mold replacement operation is mechanically performed by a hoist or the like. However, the mold replacement operation is not easy and the cost is high.
[0005]
SUMMARY OF THE INVENTION An object of the present invention is to provide a low-cost press die in which an upper suspension cam can move smoothly with a simple structure.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides, as described in claim 1, a lower mold having a work receiving table, and a pad which descends with respect to the lower mold and presses the work carried into the work receiving table. A press die having an upper die having a bending edge at the edge of the work provided on the lower die adjacent to the work receiving table; An upper hanging cam having a pendulum-shaped swinging support in the vicinity of the pad so as to approach and separate from the guide cam and having a bending blade, wherein the lower die has a bending edge; A driver having an inclined guide plate for causing a cam follower of the upper suspension cam to come into contact with the lower die and swinging the upper suspension cam in the direction of the guide cam is disposed in the vicinity of the guide cam. It is an.
[0007]
Further, as described in claim 2, the upper suspension cam is swingably supported by the upper die via a bearing, and is urged in a direction away from the guide cam by the upper suspension cam return means. It is to be.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, 1 is an upper mold and 2 is a lower mold. The lower mold 2 has a work receiving table 14 on which the work is placed. The upper die 1 has a pad 3 for holding a work carried into the work receiving table 14.
[0009]
According to the present invention, in the above press die, the lower die 2 is provided with a guide cam 4 having a bending edge 5 at a work edge adjacent to the work receiving table 14, and the upper die 1 is provided with a bending blade of the guide cam 4. 5 is provided with a bending blade 9 for bending an edge of the workpiece in contact with the guide 5 and swinging like a pendulum around a support shaft 7 near the pad 3 so as to approach and separate from the guide cam 4. An upper suspension cam 6 which is supported and has a cam follower 8 is provided. The cam follower 8 of the upper suspension cam 6 comes into contact with the lower mold 2 when the upper mold 1 descends, and the upper suspension cam 6 is moved in the direction of the guide cam 4. A driver 10 having an inclined guide plate 11 for swinging is arranged near the guide cam 4.
[0010]
As shown in FIG. 4, the upper suspension cam 6 is rotatably supported by bearings 12 having support shafts 7 provided at both ends thereof fixed to the upper mold 1. The upper suspension cam returning means guides the guide cam. 4 is urged in a direction away from it. The gas spring 13 is suitable for this means for returning the suspended cam.
[0011]
The operation of the press die of the present invention having the above structure will be described below. FIG. 1 shows the upper die 1 being lowered, and the upper suspension cam 6 is urged by a gas spring 13 to an original position which is a retracted position. As shown in FIG. 2, the upper die 1 further descends, and the cam follower 8 of the upper suspension cam 6 contacts the guide plate 11 of the driver 10, and is guided by the lower surface of the upper die 1 on the inclined surface of the guide plate 11. The upper suspension cam 6 moves forward about the support shaft 7, that is, rotates in the direction of the guide cam 4. At this time, since the upper suspension cam 6 is urged in the retreating direction by the gas spring 13, the cam follower 8 presses and contacts the guide plate 11 of the driver 10 to securely lift the upper suspension cam 6 without rising from the guide plate 11. At the same time.
[0012]
When the upper die 1 descends to the bottom dead center, as shown in FIG. 3, the upper suspension cam 6 rotates forward and the bending blade 9 of the upper suspension cam 6 becomes the lower surface of the bending blade 5 of the guide cam 4. Then, the work edge is bent into the shape of a square on the work receiving table 14.
[0013]
When the bending of the edge of the work is completed, the upper die 1 moves upward from the bottom dead center, and accordingly, the cam follower 8 of the upper suspension cam 6 rises on the inclined surface of the guide plate 11 of the driver 10 and is moved by the gas spring 13. The upper suspension cam 6 is gradually rotated in the retreating direction by the urging, and is returned to the original position, which is the retreat position, at the rising end of the upper die 1, thereby completing the machining process.
[0014]
【The invention's effect】
As described above, according to the present invention, since the upper suspension cam provided on the upper die is swingably supported in a pendulum shape by the support shaft supported by the bearing, the movement of the upper suspension cam in the front-rear direction is caused by friction. The smooth operation with low resistance is obtained and the driver that operates the upper suspension cam is a driver provided on the lower die. Therefore, there is no need to equip the upper suspension cam with a rotary cam, and a simple structure reduces weight. Can be In addition, the cam follower is pressed against the guide plate of the driver by the means for returning the upper suspension cam, and the upper suspension cam is surely rotated in the direction of the guide cam without being lifted from the guide plate to bend the work edge precisely. Has advantages.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part showing a state in which the upper die of the press die according to the present invention is being lowered. FIG. 2 is a cross-sectional view of a main part showing a state in which an upper suspension cam is in contact with a driver. FIG. FIG. 4 is a perspective view of an upper hanging cam in the press die of the present invention. FIG. 5 is a cross-sectional view of a conventional press die.
DESCRIPTION OF SYMBOLS 1 Upper die 2 Lower die 3 Pad 4 Guide cam 5 Bending blade 6 Upper suspension cam 7 Support shaft 8 Cam follower 9 Bending blade 10 Driver 11 Guide plate 12 Bearing 13 Gas spring 14 Work cradle

Claims (2)

In a press die comprising a lower die having a work receiving table, and an upper die having a pad which descends with respect to the lower die and holds the work carried into the work receiving table, a bending edge of a work edge is provided on the lower die. A guide cam having a bending blade for bending a work edge in contact with a bending blade of the guide cam, wherein the upper die is provided with a bending blade for approaching and separating from the guide cam. An upper suspension cam having a pendulum-like swingable support in the vicinity of the pad so as to have a cam follower, and a cam follower of the upper suspension cam being brought into contact with the lower mold by descending the upper mold, thereby forming the upper suspension. A press die wherein a driver having an inclined guide plate for swinging the cam in the direction of the guide cam is arranged near the guide cam. 2. The press die according to claim 1, wherein the upper suspension cam is swingably supported by the upper die via a bearing, and is urged in a direction away from the guide cam by means for returning the upper suspension cam.

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