JPH04258324A - Press die - Google Patents

Abstract

PURPOSE:To prevent a cam surface from galling and seizure in a press die provided with a cam. CONSTITUTION:The inclined 1st plane 24 of the 1st cam 22 fixed to an upper die 10, by the descent of the upper die 10, is contacted with the 1st plane 34 of the 2nd cam 32 supported by a lower die 12 to move the 2nd cam 32 and a material to be worked 42 is bent through an approach bending edge 38. Semicylindrical members 88, 104 which come into sliding contact with planes 90, 102 and can rotate integrally around the intersection line are provided near the intersection line between the 1st planes 24, 34 and the 2nd planes 26, 36 in both cams 22, 32 and both cams are acted through both semicylindrical members near the intersection line. Sliding conditions are mitigated and the sliding surfaces are prevented from galling and seizure and the wearing is restrained.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press mold equipped with a cam, and more particularly to preventing galling or seizure of the cam surface during processing.

0002

2. Description of the Related Art One type of press mold equipped with a cam is shown in FIG. This press mold includes an upper mold 200 and a lower mold 202. The upper mold 200 has a first cam 204
is fixed, and moves integrally with the upper mold 200 to approach and separate from the lower mold 202. On the other hand, lower mold 2
02, a second cam 206 is connected to the upper mold 200 and the lower mold 20.
It is provided so as to be movable in a direction perpendicular to the approach/separation direction of No. 2. A bending blade 20 is provided at the forward end of the second cam 206.
8 is fixed and moves integrally with the second cam 202. The first cam 204 and the second cam 206 each have first planes 210 and 212 inclined in a direction different from the direction of approach and separation of the upper die 200 and the lower die 202, and a second plane parallel to the moving direction. Flat surfaces 214 and 216 are formed, and a metal sliding member 22 is parallel to each flat surface.
0, 222, 224 and 226 are fixed.

In the above press mold, when the upper mold 200 approaches the lower mold 202, the first plane 210 of the first cam 204 and the first plane 212 of the second cam 206 are brought into contact with each other via the sliding members 220, 222. contact, and the second cam 206 is moved to the right in the figure. As a result, the workpiece 230 where the bending blade 208 is held by the lower mold 202
It acts on the bending process. When the upper die 200 approaches the lower die 202, the second plane 214 of the first cam 204 and the second plane 216 of the second cam 206 are moved by the sliding member 224,
Contact via 226. These second planes 214, 21
6 is provided parallel to the approaching direction of the upper die 200 and the lower die 202, so even if the first cam 204 moves relative to the second cam 206, the second cam 206 cannot be moved any further.

[0004] Therefore, the second plane 2 of the first cam 204
14 and the second plane 216 of the second cam 206, it is possible to properly bend the workpiece 230 without finely adjusting the lowering end position of the upper mold, and the pressing device Adjustment time is shortened and work efficiency is improved.

However, in the above press mold,
As the amount of descent of the upper die 200 increases, the first plane 210
, 212 decreases, and just before the bending process ends,
The intersection line between the first plane 210 and the second plane 214 of the first cam 204 and the first plane 212 and the second plane 2 of the second cam 206
16, both cams 204 and 206 come into line contact (in FIG. 7, at the contact portion 234 between the sliding member 224 and the sliding member 226). Therefore, the contact part 2
A problem is that a large reaction force is concentrated on the bending member 34 immediately before the end of the bending process, and the relative movement between the first cam 204 and the second cam 206 may cause galling, seizure, abnormal wear, etc. on the sliding members 224 and 226. was there. In addition, in a press die in which sliding members are not provided on the first and second planes of the first cam and second cam, the sliding surfaces of both cams themselves may deteriorate or be damaged, and the press die There was also the problem of shortened lifespan.

[0006] As a press mold developed to solve this problem, for example, there is one described in Japanese Utility Model Application Publication No. 60-28922. In this press die, bending of the workpiece is completed while the inclined first planes of both cams remain in contact with each other, and the movement of the die is stopped. The bending process is completed before the first cam and the second cam come into line contact, thereby avoiding occurrence of galling or the like.

[0007]

[Problem to be Solved by the Invention] However, in the press die mentioned above, the lowering end position of the upper die must be finely adjusted so that the upper die stops just when the bending process of the workpiece is completed. However, there was a problem that the work became troublesome and the work efficiency deteriorated. That is, in the above press die, when the first cam and the second cam are in contact with each other on the second plane, the second cam is not driven even if the pair of dies approach, so it is necessary to adjust the approach limit of both dies. This means that you will not be able to enjoy the advantage of the conventional press mold, which is that there is no pressure. In view of the above-mentioned problems, the present invention has been made with the object of obtaining a press mold that does not impair the advantages of conventional press molds and can also avoid galling and wear due to line contact between the first cam and the second cam. It is what was done.

[0008]

[Means for Solving the Problems] The gist of the present invention is: (1) a pair of molds that can be moved toward and away from each other; (2) a first cam that moves in the approaching and separating direction together with one of the molds; In a press mold including a second cam movably provided on the other side of the mold in a direction different from the approaching/separating direction, each of the first cam and the second cam has an intersection line between the first plane and the second plane. The rotating members having a plane including the above are provided so as to be rotatable around the intersection line and to be slidable relative to each other on the plane.

[0009]

[Operation] In the press mold configured as above,
As the pair of dies approach, the first cam and second cam come into contact on the first plane, and the second cam is moved in a direction different from the direction in which the pair of dies approach, and the workpiece is machined. be exposed. After both cams come into contact with each other on the second plane, machining of the workpiece is completed. During the above processing, the rotating members provided on the first cam and the second cam come into contact with each other in a plane. Since each rotating member is provided so as to be rotatable around the line of intersection between the first plane and the second plane, both cams move relative to each other until the lines of intersection between the first plane and the second plane of both cams coincide with each other. In between, the plane of each rotating member is located on the same plane as the first plane of each cam and functions as a part of the first plane,
If both cams further move relative to each other from the state where the above lines of intersection coincide, both rotating members will rotate around the line of intersection while remaining in surface contact on the plane, and each plane of both rotating members will correspond to each other of both cams. It is located on the same plane as the second plane and functions as a part of each second plane. Therefore, even when both cams act on each other at the intersection line position, the processing reaction force is received by the flat surfaces of both rotating members.

0010

[Effects of the Invention] In this way, even when the first cam and the second cam act on each other at the intersection line of the first plane and the second plane, the rotating member receives a reaction force while in surface contact. Therefore, compared to the conventional case where both cams move relative to each other while receiving a reaction force in a line contact state, the sliding conditions are gentler, causing galling, seizure, abnormal wear, etc. on the sliding surface. is avoided and the life of the press mold is improved. Moreover, since the movement of the second cam stops after both cams come into contact with each other on their second planes, the advantage of the conventional press die is that there is no need to fine-tune the approach limit between the pair of dies. You can enjoy your work and work efficiently. Also,
The sliding of both cam surfaces is performed well and the wear of the press die is suppressed, resulting in the effect of improving the precision of the product.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. In FIG. 1, 10 is an upper mold. The upper mold 10 is fixed to a ram (not shown), and can be moved integrally with the vertical movement of the ram. A lower mold 12 is disposed below the upper mold 10. The lower mold 12 is fixed to a bolster (not shown), and as the upper mold 10 is lowered, the upper mold 10 and the lower mold 12 are brought closer to each other. The lower die 12 includes a support surface 14 extending horizontally, and integrally includes a side wall 16 extending vertically upward. A die hole 18 is formed in the side wall 16 and extends parallel to the support surface 14 .

A first cam 22 is fixed to the lower end surface of the upper mold 10. The first cam 22 is connected to the upper mold 10 and the lower mold 12.
A first plane 24 is inclined at an angle of about 30 degrees with respect to the direction of approach and separation, and a second plane 26 extends parallel to the moving direction of the first cam 22, that is, the vertical direction. have. Furthermore, a pressing surface 28 is formed on the first cam 22 .

A second cam 3 is disposed on the support surface 14 of the lower die 12.
2 are arranged so as to be movable in the left and right direction. Second cam 3
2 is guided to move in the left and right direction by a guide (not shown) and is biased leftward by a spring 33. The second cam 32 is formed with a first plane 34 corresponding to the first plane 24 of the first cam 22 and a second plane 36 corresponding to the second plane 26 . Further, a bending blade 38 is provided at a portion of the second cam 32 that faces the side wall 16 of the lower die 12.
is fixed, and by moving the second cam 32 to the right, the workpiece 42 is moved between it and the mold surface 40 formed on the side wall 16.
The flange bending process is now being performed. During this bending process, the workpiece 42 is held against the upper mold 1 by a holding member (not shown) fixed to the ram via a cushion device.
It is held down and prevented from moving.

[0014] The second cam 32 supports another first cam 50 and a second cam 52. Each cam 50, 52, like cams 22, 32, has a first plane 54, 56, respectively.
, second planes 58, 60. The second cam 32 is formed with a support surface 64 extending parallel to the support surface 14 of the lower mold 12 and a support surface 66 extending parallel to the side wall 16.
The second cam 52 is supported movably in the left-right direction on the support surface 64, and the first cam 50 is supported movably in the vertical direction by the support surface 66 and the first plane 56 of the second cam 52. . Both cams 50 and 52 are guided in movement by a guide (not shown).

The upper end surface 68 of the first cam 50 is connected to the first cam 22.
As the first cam 22 descends, the pressing surface 28 comes into contact with the upper end surface 68 and presses down the first cam 50, thereby moving the second cam 52 to the right. It looks like this. On the other hand, the side wall 1 of the second cam 52
A hole punch 72 is fixed to the surface facing 6 via a retainer 70. The hole punch 72 penetrates the through hole 74 formed in the bending blade 38 and punches the die hole 1.
As the second cam 52 moves, the hole punch 72 punches a hole in the workpiece 42. The lower end surface 76 of the first cam 50 and the second cam 32
A spring 78 is connected between the support surface 64 of the second cam 5 and the support surface 64 of the second cam 5.
A spring 84 is disposed between the end surface 80 of the blade 2 and the end surface 82 of the bending blade 38, and urges the first cam 50 and the second cam 52 to their original positions.

The first cam 22 has a partially cylindrical concave surface 86 centered on the intersection line of the first plane 24 and the second plane 26 (straight line P shown in FIG. 5), and a semi-cylindrical member 88 is formed on the first cam 22. Rotatably fitted. The semi-cylindrical member 88 has a flat surface 90 and a partially cylindrical convex surface 92, and is fitted in such a manner that the partially cylindrical convex surface 92 is in sliding contact with the partially cylindrical concave surface 86. Figure 4
As shown in FIG. 5, a shaft member 96 is fixed to both ends of the semi-cylindrical member 88 in the longitudinal direction (only one side is shown in FIG. 5) via a spacer 94, and this shaft member 96 The semi-cylindrical member 88 is prevented from detaching from the first cam 22 by being received by a partially annular bearing 98 fixed to the first cam 22 concentrically with the partially cylindrical concave surface 86 . The spacer 94, the shaft member 96 and the bearing 98 constitute means for preventing the semi-cylindrical member 88 from falling off.

The second cam 32 also has a partially cylindrical concave surface 100 centered on the line of intersection between the first plane 34 and the second plane 36 (straight line Q shown in FIG. 5, which is the same as straight line P in the figure). A semi-cylindrical member 104 having a flat surface 102 and a partially cylindrical convex surface 103 is fitted therein. Similarly, the semi-cylindrical member 104 includes a spacer 106 and a shaft member 108, and is prevented from detaching from the second cam 24 by a bearing 110. The spacer 106, the shaft member 108, and the bearing 110 constitute means for preventing the semicylindrical member 104 from falling off.

As shown in FIG. 5, these semi-cylindrical members 88 and 104 become concentric when the intersection lines P and Q coincide with each other due to the relative movement of the first cam 22 and the second cam 32. , Q can be integrally rotated.

As shown in FIG. 1, semi-cylindrical members 88, 10
4 are respectively formed with notches 114 and 115,
Through hole 1 formed in first cam 22 and second cam 32
16 and 117, respectively, an engaging member 118,
119 is adapted to be engaged. The engaging members 118 and 119 are connected to the through holes 116 by springs 120 and 121 provided in the through holes 116 and 117.
The notches 114, 11
5 by engaging the semi-cylindrical members 88, 10, respectively.
4 and semi-cylindrical members 88, 10.
It functions as a stopper that defines the rotation limit of 4. Note that 122 and 123 are plugs that close the through hole 116.

Also, the flat surface 90 of the semi-cylindrical members 88, 104
, 102 parallel to the intersection lines P and Q are chamfered to form guide surfaces 126 and 128. With the relative movement between the first cam 22 and the second cam 32, the plane 90,
102 initiates contact, the semi-cylindrical members 88, 104
The flat surfaces 90, 102 start sliding smoothly without the partially cylindrical convex surfaces 92, 103 colliding with each other.

[0021] The workpiece 42 is bent and punched using the press die constructed as described above. Before processing, the ram is at the rising end, and the upper die 10 and the lower die 12 are separated. When the upper mold 10 is lowered together with the ram, first, the pressing member presses the workpiece 42 against the lower mold 12, and then the first cam 22 presses the workpiece 42 against the lower mold 12.
0, the first plane 24 contacts the first plane 34 of the second cam 32, as shown in FIG. At this time,
A flat surface 90 of the semi-cylindrical member 88 is located on the same plane as the first flat surface 24 and contacts the first flat surface 34 of the second cam 32 . As the upper mold 10 further descends, the first cam 22 pushes out the second cam 32 to the right against the biasing force of the spring 33, and the bending blade 38 comes into contact with the workpiece 42 to perform the bending process. be exposed.

In this process, the semi-cylindrical members 88, 10
The planes 90, 102 of 4 begin contact, but the guide surface 12
The presence of 6,128 facilitates this contact. Eventually, as shown in FIG. 4, the lines of intersection P and Q between the first plane and the second plane coincide, and the semi-cylindrical member 88 and the semi-cylindrical member 104 become concentric, and the lines of intersection coincide with each other. P
, Q can be rotated integrally. If the first cam 22 further descends in this state, both semi-cylindrical members 88, 10
4 receives the processing reaction force of the workpiece 42 and rotates counterclockwise in the figure against the frictional force between the engagement members 118 and 119, as shown in FIG. Conventionally, the reaction force received by the line contact between the first cam 22 and the second cam 32 is transferred to the flat surfaces 90, 102 of both semi-cylindrical members 88, 104.
Since the sliding conditions are relaxed, galling and seizure on the sliding surface can be avoided. In addition, the force of the semi-cylindrical members 88, 104 is also transmitted to the partially cylindrical convex surfaces 92, 10.
3 and the partial cylindrical concave surface 86, 100,
The sliding conditions in this part are also gentle.

As shown in FIG.
4 rotates, and the planes 90 and 102 respectively become the second plane 26.
, 36, the first cam 2
Even if the second cam 2 is lowered, the second cam 32 is not moved any further, and the bending process by the bending blade 38 is completed.

On the other hand, the upper mold 10 further descends, and the pressing surface 28 of the first cam 22 comes into contact with the upper end surface 68 of the first cam 50. As a result, the first cam 50 is lowered, the second cam 52 is moved by the first plane 54 of the first cam 50, and the workpiece 4 after being bent by the hole punch 72 is moved.
2 holes are punched. When all the machining is completed, the descent of the ram is stopped, the upper mold 10 and the first cam 22 are raised together with the ram, and the workpiece 42 is moved to the lower mold 12.
removed from.

In this embodiment, the first cam 50 and the second cam 52 are not provided with a partially cylindrical concave surface and a semi-cylindrical member, but this is because the holes in the workpiece 42 are machined by both cams 50 and 52. In the case of punching, there is no need to accurately define the rightward movement limit of the second cam 52, and punching can be completed while the inclined first planes 54 and 56 remain in contact. It is. When bending a workpiece using the cams 50 and 52, it is desirable that these also be provided with a partial cylindrical surface and a semi-cylindrical member.

Furthermore, in this embodiment, the first cam 22
was fixed to the upper mold 10 and moved together with the upper mold 10, but like the first cam 50, it is movably held by the lower mold, and moves toward and away from the upper mold together with the movement of the upper mold. It is also possible to provide it so that it can be moved.

It is also possible to configure the drop-off prevention means as shown in FIG. Partial cylindrical convex surface 13 of semi-cylindrical member 130
1 is provided with a T-shaped groove 132 extending in the circumferential direction, a T-shaped engaging member 136 fixed on the cam 134 side is engaged with the T-shaped groove 132, and a wave spring 138 is inserted. This prevents it from falling off and provides appropriate frictional resistance. In this case, the number of parts decreases,
The effect of reducing device costs can be obtained.

Further, even when the pair of dies are separated, the first planes of the first cam and the second cam are in contact with each other, and the semi-cylindrical member is prevented from falling off by the first plane of the other cam. etc., it is also possible to omit the drop-off prevention means. Furthermore, in this embodiment, the semi-cylindrical member 8
8 and 104 constitute a rotating member, but if these shaft members 96 and 108 are made large enough to receive the processing reaction force, the partial cylindrical concave surface 86 and 100 and the partial cylindrical convex surface 9
2, 103 is no longer necessary, and there is no need for a semi-cylindrical member. The pivot member has flat surfaces 90, 102;
It is only necessary to attach it to the first cam and the second cam so as to be rotatable around the center line of rotation on those planes.

In addition, the present invention can be implemented with various modifications and improvements based on the knowledge of those skilled in the art.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view showing the main parts of a press die that is an embodiment of the present invention.

FIG. 2 is a partial front sectional view showing another operating state of the press mold.

FIG. 3 is a partial front sectional view showing still another operating state of the press mold.

FIG. 4 is a partial front cross-sectional view (IV-IV cross section in FIG. 5) showing still another operating state of the press mold.

FIG. 5 is a sectional view taken along line V-V in FIG. 4;

FIG. 6 is a front cross-sectional view showing a drop-off prevention means of a press mold according to another embodiment of the present invention.

FIG. 7 is a front sectional view showing the main parts of a conventional press mold.

[Explanation of symbols]

10 Upper mold 12 Lower mold 22 First cam 24 First plane 26 Second plane 32 Second cam 34 First plane 36 Second plane 88 Semi-cylindrical member 90 plane 102 Plane 104 Semi-cylindrical member

Claims (1)

[Claims] 1. A pair of molds that can move toward and away from each other, a first cam that moves in the approaching and separating direction together with one of the molds, and a first cam that can move the other of the pair of molds in a direction different from the approaching and separating direction. a second cam provided in the moving direction, and each of the first cam and the second cam has a first plane inclined in a direction different from the approaching/separating direction, and a second plane parallel to the moving direction. The press mold is provided with a press mold that performs processing by moving a processing tool in a direction different from the approaching/separating direction by driving the second cam by the first cam as the pair of molds approach, the first cam and the second cam A press characterized in that a rotary member having a plane including a line of intersection between the first plane and the second plane is provided in each of the presses so as to be rotatable around the line of intersection and slidable relative to each other on the plane. Type.