JP4604334B2 - Cam for press mold - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention uses a cam slide having a slanted cam surface to change the pressing force in one direction such as downward of the press machine to the pressing force in the other direction such as sideways intersecting with the press machine. The present invention relates to a cam for a press mold that performs processing such as shearing and bending.
[0002]
[Problems to be solved by the invention]
A press mold cam usually has a movable cam slide having a cam surface, a cam driver that moves the cam slide in contact with the cam surface of the cam slide, and a return that returns the cam slide to its original position. The return means includes a coil spring, a rubber body, and a gas spring. Any of the return means can be used as a cam slide. The cam slide is applied with an initial pressure for completely restoring the initial position to the initial position and a final pressure (this is usually referred to as stripping power) for separating the machining tool from the workpiece after machining.
[0003]
In the press mold cam, if the final pressure is small, there is a risk of damaging the cam slide, cam driver or forced return mechanism. For example, in the return means using a coil spring, the spring constant in expansion and contraction is almost constant. Therefore, if the final pressure is simply increased, the initial pressure also increases proportionally. As a result, the cam driver contacts the cam slide from the time of contact. A large force is applied to the sliding surfaces of the cam slide and the cam driver, and there is a possibility that the sliding surfaces may be worn out early, and a relatively large final pressure can be obtained compared with the return means using the coil spring. The return means using a rubber body must be large in order to obtain an expansion / contraction amount corresponding to the movement amount of the cam slide.
[0004]
In order to increase the final pressure equivalently in place of the above, even if a rubber pad structure is provided in the vicinity of the processing tool or a rubber stripper is attached to the processing tool, the price is increased and the workpiece and In this connection, there is a case where such a rubber pad structure or a rubber stripper cannot be used.
[0005]
The present invention has been made in view of the above-mentioned points, and an object of the present invention is to increase the final pressure with a compact and simple structure, and to cause early wear on the sliding surfaces of the cam slide and the cam driver. Further, it is an object of the present invention to provide a press mold cam having excellent versatility that does not become an obstacle to alignment of a processing tool.
[0006]
[Means for Solving the Problems]
The press mold cam according to the first aspect of the present invention includes a movable cam slide having a cam surface, a cam driver for moving the cam slide in contact with the cam surface of the cam slide, and a cam slide as a base. And a base on which the cam slide is movably provided. Here, the return means applies a return force to the cam slide to return the cam slide to the original position. And an elastic body for providing the cam slide with an additional return force for returning the cam slide to the original position in addition to the return force by the elastic means when the elastic means is reduced to a certain degree or more. The base has a front wall facing the front surface of the cam slide, and the elastic body is disposed between the front surface of the cam slide and the front wall of the base.
[0007]
The press mold cam according to the first aspect includes an elastic body that imparts an additional restoring force to the cam slide when the elastic means is reduced beyond a certain level. Since it can be made small depending on the reaction force by the elastic means, there is no risk of premature wear on the sliding surface between the cam slide and the cam driver, and the elastic body is connected to the front surface of the cam slide and the front wall of the base. Therefore, the structure can be made compact and simple, and the versatility can be improved.
[0008]
In a preferred example, as in the second aspect of the present invention, the elastic body is mounted on the cam slide side or the front wall side of the base and is disposed between the front surface of the cam slide and the front wall of the base. In this case, even if the elastic body is detachably fixed by using a screw or fitting so that the positioning operation of the processing tool can be easily performed without being obstructed by the elastic body. Alternatively, it may be fixed via an adhesive, and the elastic body in the present invention is a rubber such as natural rubber or synthetic rubber, preferably as in the third aspect of the present invention. It is made of urethane rubber, and the number of elastic bodies may be one, but may be two or more as in the fourth aspect of the present invention.
[0009]
One elastic means may be provided, but a plurality of two or more elastic means may be provided as in the fifth aspect of the present invention, and further, a coil spring or a gas spring as in the sixth aspect of the present invention. May be provided. When the elastic means is configured by providing the coil spring, the initial pressure can be reduced as compared with the gas spring, so that early wear on the sliding surface between the cam slide and the cam driver can be further preferably reduced.
[0010]
In a preferred example, as in the seventh aspect of the present invention, the elastic means includes a coil spring whose one end is in contact with the cam slide, and the return means includes a holding means for holding the coil spring and the elastic body. The holding means is provided at one end of the rod so as to receive the rod extending through the cam slide and surrounded by the coil spring, and the other end of the coil spring, and an elastic body is mounted. The elastic body may be fixedly attached to the spring receiver with an adhesive as in the eighth aspect of the present invention, and the rod may be As in the ninth aspect, the rod main body having a large portion at one end and the screw member having the other large portion at one end and the other end screwed to the other end of the rod main body. Body, and the spring support other than the rod body It may be sandwiched between the rod portion and the enormous portion of the screw member and provided at one end of the rod, and by combining such a rod and spring receiver, the spring holder can be firmly fixed to the other end portion of the rod. The rod body and screw member can be screwed together, and this screwing can be released, and the spring holder can be attached to and detached from one end of the rod, making disassembly and assembly extremely easy. By once removing the elastic body from between the front surface of the cam slide and the front wall of the base, the work tool can be easily aligned without being obstructed by the elastic body.
[0011]
In the press mold cam of the present invention, as in the tenth aspect, the cam slide is a bottom cam type, and a rectangular recess is formed in the base, and the cam slide moves to this rectangular recess. Even if it is arranged freely, the cam slide is a hanging cam type as in the eleventh aspect, and a rectangular recess is formed in the base, and the cam slide can move freely in this rectangular recess It may be arranged.
[0012]
One return means may be provided, but a plurality of two or more return means may be provided in order to obtain a large return force as a whole or to provide a fail-safe press mold cam.
[0013]
The cam for a press mold according to the present invention may be provided with a single machining tool on the cam slide, but may alternatively be provided with a plurality of machining tools on the cam slide.
[0014]
Hereinafter, the present invention and its embodiments will be described based on preferred examples shown in the drawings, but the present invention is not limited to these examples.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
1 to 3, the press mold cam 1 of this example has a cam surface 2, a cam slide 3 movable in the X direction (horizontal direction), and a rectangular recess 4. A base 5 on the lower mold side in which the cam slide 3 is movable in the X direction, a cam driver 6 that contacts the cam surface 2 of the cam slide 3 to move the cam slide 3 in the X direction, and a cam slide And return means 7 for returning 3 to the original position.
[0016]
The cam slide 3 includes a main body 12 having a cylindrical bottomed hole 11 at a lower portion, a sliding material (wear plate) 15 attached to a slope 13 at the upper portion of the main body 12 by screws or bolts 14, and the like. Sliding materials (wear plates) 19, 20 and 21 attached to screws or bolts on the bottom wall 16 and the side walls 17 and 18, respectively, and rubber attached to the rear wall 22 at the bottom of the main body 12. The outer surface of the sliding member 15 constitutes the cam surface 2, and a processing tool 24 such as a cutting blade is provided with a tool attachment 25 on the front surface 23 at the top of the main body 12. It can be attached via. The bottomed hole 11 opens to the outside at the front wall 26 at the bottom of the main body 12.
[0017]
The base 5 defines the rectangular recess 4 and is integrally formed with the bottom wall 31, the side walls 32 and 33, the front and rear walls 34 and 35, and the front and rear walls 34 and 35 to bridge the side walls 32 and 33. And holding plates 37 and 38 fixed by screws or bolts 36.
[0018]
The cam slide 3 of this example is a bottom cam type, and is not lifted by contact engagement between the holding plates 37 and 38 and the sliding members 20 and 21, so that the bottom wall 16, the side walls 17 and 18, and the front and rear walls 26 and 22 are arranged in the rectangular recess 4 at the lower part thereof so as to be movable in the X direction, and the sliding members 19, 20 and 21 are respectively attached to the bottom wall 31 and the side walls 32 and 33 of the base 5. Abuts slidably in the X direction.
[0019]
The cam driver 6 includes a main body 42 attached to an upper base (not shown) or a ram or the like via a mounting flange portion 41 with screws or bolts, and the inclined surface of the main body 42 has a cam slide 3. The cam surface 43 that contacts the cam surface 2 is configured, and the lower portion 44 of the main body 42 is bifurcated.
[0020]
The return means 7 is a coil spring 52 as a stretchable elastic means for giving the cam slide 3 a return force for returning the cam slide 3 to its original position, and the return by the coil spring 52 when the coil spring 52 is contracted more than a certain amount. In addition to the force, there are provided two cylindrical elastic bodies 54 for giving the cam slide 3 an additional return force for returning the cam slide 3 to its original position, and holding means 55 for holding the coil spring 52. Yes.
[0021]
The coil spring 52 is disposed in the bottomed hole 11 formed in the cam slide 3 with one end 51 abutting against the rear wall 22 of the main body 12 in the bottomed hole 11, and the front surface 53 below the main body 12. Each elastic body 54 disposed between the front wall 34 of the base 5 is made of urethane rubber, and comes into contact with the front surface 53 of the lower front wall 26 of the main body 12 when the coil spring 52 is reduced more than a certain amount. It has become.
[0022]
The holding means 55 passes through a through hole 61 formed in the lower rear wall 22 of the main body 12 and is surrounded by the coil spring 52 and extends through the bottomed hole 11, and the other end of the coil spring 52. In order to receive 63, it is provided at one end portion 64 of the rod 62 on the bottomed hole 11 side, and a spring receiver 65 to which an elastic body 54 is fixedly attached with an adhesive.
[0023]
The rod 62 of this example disposed between the front wall 34 and the rear wall 35 defining the rectangular recess 4 includes a screw member 72 having a huge portion 71 at one end portion 64 and a retaining member at one end portion 73. The other end 75 has a two-part body with a rod body 77 screwed to the other end 76 of the screw member 72, and the rear wall 22 is formed at the portion of the rod body 77. On the other hand, it is relatively slidable in the X direction and penetrates the through hole 61.
[0024]
The enormous portion 71 is placed on the stepped portion 82 of the front wall 34 with a gap 81 between itself and the front wall 34. Similarly, the enormous portion 74 has a gap 83 between the rear wall 35 and the rear wall. 35, and a combination of the cam slide 3 and the return means 7 by loosening the screws or bolts 36 and removing the holding plates 37 and 38 from the side walls 32 and 33. Can be removed from the recess 4.
[0025]
The spring receiver 65 is sandwiched between the enormous portion 71 of the screw member 72 and the other end portion 75 of the rod body 77 and is provided at the one end portion 64 of the rod 62 so as to be able to contact the front wall 34.
[0026]
In the press mold cam 1 provided with the lower type cam slide 3 placed on the lower type base 5 as described above, as shown in FIG. 1, the cam driver 6 is arranged at the raised position. The cam slide 3 is returned to the original position with the initial pressure P1 (see FIG. 5) based on the elastic force of the coil spring 52.
[0027]
When the cam driver 6 is lowered by the operation of a hydraulic ram or the like, the cam surface 43 of the cam driver 6 comes into contact with the cam surface 2 of the cam slide 3. It is moved in the X direction against the elastic force of the spring 52. During this movement, the cam slide 3 compresses the elastic body 54 in addition to the coil spring 52 by the contact of the front surface 53 with the elastic body 54 after the coil spring 52 is contracted to a predetermined length. 4 is disposed at a position shown in FIG. 4 against the elastic force of the spring 52 and the elastic body 54. In such movement of the cam slide 3 in the X direction, the workpiece (workpiece) is subjected to machining including drilling or the like by the machining tool 24 mounted on the front surface 23 at the top of the cam slide 3. When the cam driver 6 is lifted after the processing is completed, the cam slide 3 is also first moved toward the original position by the final pressure P2 (see FIG. 5) based on the elastic force of the coil spring 52 and the elastic body 54. Then, the initial pressure P1 based on the elastic force of the coil spring 52 is returned to the original position and stopped.
[0028]
By the way, according to the press mold cam 1, the elastic body 54 comes into contact with the cam slide 3 when the coil spring 52 is contracted more than a certain amount. The final pressure P2 can be increased by force (additional return force) as shown in FIG. 5, and the initial pressure P1 can be made to depend on the reaction force (return force) due to the contraction of the coil spring 52 without the involvement of the elastic body 54. Therefore, there is no risk of premature wear on the cam surfaces 2 and 43, which are the sliding surfaces of the cam slide 3 and the cam driver 6, and the elastic body 54 is mounted on the spring support 65 and the front surface 53 is attached. Since it is arranged between the front wall 34 and the front wall 34, a compact and simple structure is obtained, and the shape of the workpiece is not affected by the workpiece. The elastic body 54 can be used and In addition, since the holding means 55 can be disassembled and the elastic body 54 can be removed from the cam slide 3 together with the spring receiver 65, the work tool 24 can be easily aligned without being obstructed by the elastic body 54. .
[0029]
The above example is the press mold cam 1 in which the cam slide 3 is configured as a lower cam type. Instead of this, the base 5 is attached to an upper mold base (not shown) or a ram, etc. 3 may be suspended from the base 5 so that the cam slide 3 may be a suspension cam type to implement a press mold cam. In the above, the elastic body 54 is fixed to the spring support 65 and the cam The elastic body 54 is mounted on the front wall 34 side of the base 5, but instead, the elastic body 54 is directly fixed to the front wall 34 and the elastic body 54 is fixed to the front wall 34 side of the base 5. Further, the elastic body 54 may be fixed to the front surface 53 and the elastic body 54 may be mounted on the cam slide 3 side.
[0030]
【The invention's effect】
According to the present invention, the final pressure can be increased by a compact and simple structure, and there is no risk of premature wear on the sliding surface between the cam slide and the cam driver. In addition, it is possible to provide a press mold cam having excellent versatility that does not become an obstacle.
[Brief description of the drawings]
FIG. 1 is a front sectional view of a preferred example of the present invention.
2 is a cross-sectional view taken along the line II-II of the example shown in FIG.
FIG. 3 is a left side view of the example shown in FIG.
4 is an operation explanatory diagram of the example shown in FIG. 1. FIG.
FIG. 5 is an operation explanatory diagram of the example shown in FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Press die cam 2 Cam surface 3 Cam slide 6 Cam driver 7 Return means 52 Coil spring 54 Elastic body

Claims (11)

A movable cam slide having a cam surface, a cam driver for moving the cam slide in contact with the cam surface of the cam slide, a return means for returning the cam slide to its original position, and the cam slide being movable The return means includes a stretchable elastic means for applying a return force to the cam slide to return the cam slide to its original position, and an elastic means for reducing the elastic means to a certain extent. And an elastic body that gives the cam slide an additional return force that returns the cam slide to its original position, and the base has a front wall facing the front surface of the cam slide. The elastic body is a cam for a press mold disposed between the front surface of the cam slide and the front wall of the base. The press mold cam according to claim 1, wherein the elastic body is mounted on the cam slide side or the front wall side of the base. The press mold cam according to claim 1, wherein the elastic body is made of urethane rubber. The cam for a press die according to any one of claims 1 to 3, wherein a plurality of elastic bodies are arranged. The press mold cam according to any one of claims 1 to 4, wherein a plurality of elastic means are provided. The cam for a press die according to any one of claims 1 to 5, wherein the elastic means includes a coil spring or a gas spring. The elastic means includes a coil spring whose one end is in contact with the cam slide, and the return means includes a holding means for holding the coil spring and the elastic body. The holding means penetrates the cam slide and is coiled. 7. The rod according to claim 1, further comprising: a rod surrounded by a spring and extending; and a spring receiver provided at one end of the rod for receiving the other end of the coil spring and mounted with an elastic body. The cam for press dies as described in any one of Claims. The press mold cam according to claim 7, wherein the elastic body is fixedly attached to the spring receiver with an adhesive. The rod includes a two-part body having a rod body having a huge portion at one end and a screw member having another huge portion at one end and the other end screwed to the other end of the rod body. The press die cam according to claim 7 or 8, wherein the spring support is sandwiched between the other end portion of the rod body and the enormous portion of the screw member and provided at one end portion of the rod. The cam slide is a bottom cam type, and a rectangular recess is formed in the base, and the cam slide is movably disposed in the rectangular recess. Cam for press dies. The cam slide is a suspension cam type, and a rectangular recess is formed in the base, and the cam slide is movably disposed in the rectangular recess. Cam for press dies.

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