JP4539087B2 - Cam for press mold - Google Patents

Description

  The present invention uses a cam slide having an inclined cam surface to change the pressurizing force in one direction such as downward of the press machine to the pressurizing force in the other direction such as laterally intersecting the press machine. The present invention relates to a cam for a press mold that performs processing such as shearing and bending.

JP 2002-137026 A

  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. Force generating means (return means), and the return force generating means includes a coil spring, a rubber body, and a gas spring. Even in the generating means, an initial pressure for completely returning the cam slide to the initial position and a final pressure for separating the machining tool from the workpiece after machining (this is usually called stripping power) are applied to the cam slide. ing.

  For press mold cams, if the final pressure is small, there is a risk of damaging the cam slide, cam driver, forced return mechanism or processing tool. Although it is preferable, for example, in the return force generating means using a coil spring, if the final pressure is increased with one coil spring, the spring diameter increases or the coil spring having a large spring constant has a small contraction margin and a constant stroke. It will lead to longer and larger cams.

  Instead of the above, in order to increase the final pressure equivalently, 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 increases and the bottom dead center is reached. In order to exert a large force, a long rubber stripper is required, which causes a problem that the cam is enlarged.

  Therefore, the present applicant has proposed a press mold cam using urethane rubber as described in Patent Document 1. According to this, the initial purpose can be almost achieved, but a large final pressure and In order to do so, a long urethane rubber capable of obtaining a large amount of deflection is used. By the way, such a long urethane rubber not only makes it difficult to install it between the cam slide and the base, but also may cause fatigue due to long-term use, buckling, deterioration of elastic characteristics, etc. is there.

  The present invention has been made in view of the above-mentioned points. The object of the present invention is to obtain a large final pressure without using urethane rubber, and to reliably separate the processing tool from the workpiece after processing. An object of the present invention is to provide a press mold cam that can be made to operate.

  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. A return force generating means for generating a gradually increasing return force for returning the cam slide to the original position in the movement of the cam slide, and a base on which the cam slide is movably provided. Here, the return force generating means includes at least a pair of coil springs that are juxtaposed with each other and that generate elastic return forces independently of each other.

  According to the press mold cam of the first aspect, the return force generating means has at least a pair of coil springs, and such at least a pair of coil springs generate the return forces independently of each other. Therefore, a large final pressure can be obtained by the resultant force of the elastic force of the pair of coil springs. Moreover, since at least the pair of coil springs are juxtaposed with each other, a large installation place is not required.

  The return force generating means, like the press mold cam of the second aspect of the present invention, penetrates the cam slide so as to be movable, and the holding rod whose movement is restricted by the base in the moving direction of the cam slide. In this case, the pair of coil springs are arranged so as to surround the holding rod.

  According to the press mold cam of the second aspect, since the pair of coil springs are arranged so as to surround the holding rod, the holding rod prevents the pair of coil springs from being bent and drooped, and The buckling of the coil spring is prevented. In such an aspect, the pair of coil springs are arranged concentrically and the coil spring located outside the pair of coil springs is arranged in a recess formed in the cam slide, so that While the coil spring located outside is guided by the cam slide, the coil spring located inside the pair of coil springs is guided by the holding rod, so that the bending and sagging of the pair of coil springs are further prevented. The buckling of the pair of coil springs can be prevented more reliably. When the pair of coil springs are arranged concentrically around the holding rod, by making the winding directions of the pair of coil springs opposite to each other, the meshing of the pair of coil springs is not only prevented but also bent. As a result, the sagging is prevented more reliably, and the buckling of the pair of coil springs is more reliably prevented.

  The press mold cam according to the third aspect of the present invention is the press mold cam according to the second aspect, wherein the base is a front wall facing the front surface of the cam slide and a rear surface facing the rear surface of the cam slide. And the holding rod has a spring support and is disposed between the front wall and the rear wall, and one of the pair of coil springs has one end thereof. The other end of the cam slide is in contact with the rear portion of the cam slide, and the other end is pressed against the spring support from the middle of the movement of the cam slide. The other coil spring of the springs is disposed so that one end of the coil spring is pressed by the cam slide during movement of the cam slide and the movement of the other end is blocked by the spring receiver.

  According to the press mold cam of the third aspect, the other coil spring generates a restoring force that gradually increases in the movement of the cam slide, and the one coil spring gradually moves from the middle of the movement of the cam slide. As a result of generating an increasing return force, a large final pressure can be obtained by combining the return force due to the elastic force of one coil spring and the return force due to the elastic force of the other coil spring. As a result of generating the return force due to the elastic force from the middle of the movement of the cam slide, it is only necessary to cause the movement of the cam slide halfway against the gradually increasing return force by the other coil spring. The movement can be surely performed.

  In the press mold cam of the fourth aspect of the present invention, in the press mold cam of the third aspect, the spring receiver is an annular protrusion that presses the other end of one coil spring during the movement of the cam slide. And a recess that is surrounded by the protrusion and accommodates the other end of the other coil spring, and the other end of the other coil spring abuts against the spring receiver. And the other end is prevented from moving.

  According to the press mold cam of the fourth aspect, since the other end of the other coil spring is in contact with the spring receiver in the recess surrounded by the annular protrusion, The end can be securely held.

  In the press mold cam of the fifth aspect of the present invention, in the press mold cam of the third or fourth aspect, the cam slide accommodates one coil spring and has a recess through which the holding rod passes. One of the coil springs is disposed in the recess of the cam slide, with one end thereof in contact with the rear portion of the cam slide and the other end in contact with the front portion of the cam slide, respectively. The other coil spring is arranged such that one end thereof is pressed against the cam slide in the recess of the cam slide.

  According to the press mold cam of the fifth aspect, since one coil spring is disposed in the recess, the one coil spring can be reliably held on the surface of the cam slide that defines the recess. .

  In the press mold cam of the sixth aspect of the present invention, in the press mold cam of the second aspect, the base is a front wall facing the front surface of the cam slide and a rear surface facing the rear surface of the cam slide. And the holding rod has a spring support and is disposed between the front wall and the rear wall, and one coil spring of the pair of coil springs is provided on the cam slide. One end of the coil spring is pressed against the cam slide from the middle of movement, and the other end is blocked by a spring receiver. The other coil spring of the pair of coil springs In the movement, one end is pressed against the cam slide and the other end is prevented from moving by a spring bearing.

  According to the cam for the press mold of the sixth aspect, like the third aspect, the other coil spring generates a restoring force that gradually increases in the movement of the cam slide, and the one coil spring As a result of generating a return force that gradually increases from the middle of the movement of the cam slide, it is possible to obtain a large final pressure that combines the return force due to the elastic force of one coil spring and the return force due to the elastic force of the other coil spring. Moreover, as a result of generating a restoring force due to the elastic force of one coil spring from the middle of the movement of the cam slide, the movement to the middle of the cam slide is performed against the gradually increasing restoring force of the other coil spring. Therefore, the cam slide can be surely moved.

  In the press mold cam of the sixth aspect, in one preferred embodiment, one coil spring is supported by the holding rod so as to be movable with respect to the moving direction of the cam slide, as in the press mold cam of the seventh aspect of the present invention. However, the present invention is not limited to this. For example, even if one end of one coil spring is fixed to the cam slide in advance, the other end of one coil spring is replaced by a spring support. It may be fixed in advance.

  In the press mold cam of any of the second to seventh aspects, one coil spring is caused by the other coil spring in the movement of the cam slide, like the press mold cam of the eighth aspect of the present invention. The cam slide is arranged so that the return force to the original position of the cam slide increases with a delay from the increase of the return force to the original position of the cam slide.

  The press mold cam according to the ninth aspect of the present invention is the press mold cam according to the second aspect, wherein the base is a front wall facing the front surface of the cam slide and a rear surface facing the rear surface of the cam slide. The holding rod is provided with a spring support and is arranged between the front wall and the rear wall. The cam slide is arranged so that the movement of each other end is blocked by a spring support. In such a press mold cam, the press of the tenth aspect as a reference example of the present invention is provided. Like the mold cam, one of the pair of coil springs may be arranged such that one end thereof is in contact with the cam slide and the other end is in contact with the spring receiver.

  In the press mold cam of the eleventh aspect of the present invention, in the press mold cam of the second aspect, the base faces the front wall facing the front face of the cam slide and the rear face of the cam slide. The holding rod has a pair of spring supports that are spaced apart from each other with respect to the direction of movement of the cam slide, and is disposed between the front wall and the rear wall, One of the pair of coil springs has one end pressed against the cam slide during movement of the cam slide, and the other end is prevented from moving by one of the pair of spring supports. The other coil spring of the pair of coil springs has one end pressed against the cam slide and the other end moved out of the pair of spring receivers. Block with the other spring support It is arranged to be.

  In any of the above press mold cams, the pair of coil springs are preferably arranged concentrically like the press mold cam of the twelfth aspect of the present invention.

  Further, in the press mold cam of the thirteenth aspect as a reference example of the present invention, in the press mold cam of the first aspect, the base includes a front wall facing the front surface of the cam slide, A rear wall facing the rear surface, and a guide rod that movably penetrates the cam slide and is supported by the front wall and the rear wall and guides the movement of the cam slide; It has a holding rod that penetrates the cam slide and is provided with a spring support. One of the coil springs of the pair of coil springs, one end of the cam slide is in the middle of the movement of the cam slide. And the other end of the pair of coil springs is pressed against the cam slide when the cam slide moves. And the other end is prevented from moving by a spring support. Here, like the cam for a press die of the fourteenth aspect as a reference example of the present invention, one coil spring is arranged. Is arranged so as to surround the guide rod, and the other coil spring is preferably arranged so as to surround the holding rod. For the press die of the thirteenth or fourteenth aspect as such a reference example In the cam, one coil spring is returned to the original position of the cam slide by the other coil spring during the movement of the cam slide, like the press mold cam of the fifteenth aspect as a reference example of the present invention. The cam slide is arranged so that the return force to the original position of the cam slide increases with a delay from the increase in force.

  In the present invention, the pair of coil springs, like the press mold cams according to the sixteenth aspect, may have the same elastic coefficient as the press mold cams according to the seventeenth aspect. Further, one coil spring of the pair of coil springs may have an elastic coefficient larger than that of the other coil spring, and the other coil spring may be the press of the eighteenth aspect. Like a mold cam, its one end is arranged in contact with the cam slide and the other end is in contact with the spring bearing.

  In the present invention, the cam slide is a suspended cam type as in the press mold cam of the twentieth aspect, even if it is a lower cam type as in the press mold cam of the nineteenth aspect. In any type, the base is formed with a rectangular recess, and the cam slide may be movably disposed in the rectangular recess.

  In the present invention, in order to obtain a larger final pressure, at least one urethane rubber or coil spring may be further used in addition to the pair of coil springs.

  ADVANTAGE OF THE INVENTION According to this invention, a big final pressure can be obtained even if it does not use urethane rubber, and the cam for press dies which can make a processing tool leave | separate reliably from a to-be-processed member after a process can be provided.

  Next, the present invention and its embodiments will be described in more detail based on preferred examples shown in the drawings. The present invention is not limited to these examples.

  1 to 4, a press mold cam 1 of this example has a cam surface 2 and is movable in a lateral direction H, and a cam surface having a shape complementary to the cam surface 2. 4 and a cam driver 5 that contacts the cam surface 2 of the cam slide 3 at the cam surface 4 and moves the cam slide 3 in the lateral direction H, that is, moves forward, and returns the cam slide 3 to its original position. The cam slide 3 is provided movably in the lateral direction H, and a return force generating means 6 for generating a gradually increasing return force for returning the cam slide 3 to the original position in the forward movement of the cam slide 3. And a base 7.

  The cam slide 3 of the lower cam type includes a cam slide main body 11, a tool mounting portion 13 provided integrally with the protruding front surface 12 of the cam slide main body 11, and an inclined upper surface 14 of the cam slide main body 11 via screws 15 and the like. And a sliding plate (wear plate) 16 having an inclined cam surface 2 and an annular spring receiving plate 18 fixed to the receding front surface 17 of the cam slide main body 11 by welding, screws or the like on the outer peripheral edge side. A sliding plate (wear plate) 20 attached to the lower surface 19 of the cam slide body 11 via screws, and a sliding plate (wear) attached to both side surfaces 21 and 22 of the cam slide body 11 via screws or the like. Plate) 23 and 24.

  The cam slide body 11 is closed at one end by a receding front surface 17 and closed at the other end by a spring seat surface 30, that is, a spring seat surface 30 having a large-diameter spring seat surface 31 and a small-diameter spring seat surface 32. A recess 33 extending to H is provided in the lower portion 34, and the large-diameter spring seat surface 31 at the rear portion of the cam slide body 11 is connected to the cam slide body 11 via the annular step 35 of the cam slide body 11. The rear small-diameter spring seat surface 32 is arranged concentrically.

  A punch tool 37 is replaceably attached to the tool attachment portion 13 provided on the protruding front surface 12 of the upper portion 36 of the cam slide main body 11.

  In the sliding plates 16, 20, 23, and 24, a plurality of holes (recesses) in which a solid lubricant is embedded in the cam surface 2, the sliding lower surface 41, and the sliding side surfaces 42 and 43 that slide relative to the mating member. ) May be provided as necessary.

  The annular spring receiving plate 18 is fixed to the receding front surface 17 on the outer peripheral edge side with the inner peripheral edge side partially closing the opening at the receding front surface 17 of the recess 33.

  The cam driver 5 includes a base portion 45 and a cam driver main body 46 that is formed integrally with the base portion 45 and has the cam surface 4. The cam driver 5 is lowered to the base portion 45. A drive mechanism such as a hydraulic ram is connected, and the lower part of the cam driver main body 46 uses the cam driver 5 for a press mold cam 1 using a guide rod 131 (see FIGS. 13 and 14) described later. In order to be able to do so, it is formed with a bifurcated portion 47 that avoids contact with the guide rod 131.

  The return force generating means 6 passes through a pair of coil springs 51 and 52 that are juxtaposed to each other and generate elastic return forces independently of each other, and the lower portion 34 of the cam slide 3 movably in the lateral direction H. And a holding rod 55 whose movement is restricted by the front wall 53 and the rear wall 54 of the base 7 with respect to the lateral direction H which is the moving direction of the cam slide 3.

  The pair of coil springs 51 and 52 surround the holding rod 55 and are concentrically arranged, and have different elastic coefficients. In this example, the coil spring 51 is larger than the elastic coefficient of the coil spring 52. It has an elastic coefficient and is arranged outside the coil spring 52, in other words, surrounding the coil spring 52.

  The coil spring 51 accommodated in the recess 33 has an annular end whose one end 61 is a large-diameter spring seat surface 31 that is the rear portion of the cam slide 3 and whose other end 62 is the front portion of the cam slide 3. The coil spring 52 is disposed in contact with the spring receiving plate 18, and the coil spring 52 has one end 63 at the recess 33 and a small-diameter spring seat surface 32, which is the rear portion of the cam slide 3, and the other end 64 at the spring receiver. 65 spring seat surfaces 66 are arranged so as to be in contact with each other and pressed.

  The holding rod 55 disposed between the front wall 53 and the rear wall 54 has a rod body 72 having an enormous portion 71 at one end and penetrating the recess 33, and one end at the other end of the rod body 72. The auxiliary rod 74 is screwed and has a large portion 73 at the other end, and a spring receiver 65 sandwiched between the rod main body 72 and the auxiliary rod 74.

  The spring receiver 65 is provided integrally with the disc-shaped base 75 sandwiched between the rod main body 72 and the sub rod 74, and the other end 62 of the coil spring 51 in the movement of the cam slide 3. And a recess 77 which is surrounded by the protrusion 76 and accommodates the other end 64 of the coil spring 52. The other end 64 of the coil spring 52 is The recess 67 is in contact with the spring seat surface 66.

  The base 7 includes a base 81, a front wall 53 facing the receding front surface 17 that is the front surface of the cam slide 3, a rear wall 54 facing the rear surface 82 of the cam slide body 11 of the cam slide 3, the sliding plate 23, A pair of side walls 85 and 86 each having sliding surfaces 83 and 84 that slidably contact with the 24 sliding side surfaces 42 and 43, respectively, and a slide that slidably contacts the sliding lower surface 41 of the sliding plate 20. A sliding plate (wear plate) 89 having a moving upper surface 87 and fixed to the base 81 via a screw 88 (see FIG. 13) and sliding upper surfaces 91 and 92 of the sliding plates 23 and 24 are slidable. To the rear wall 54 of the rear surface 82 of the rear surface 82 of the cam slide main body 11 and the guide plates 96 and 97 each having a sliding lower surface 93 and 94 abutting and fixed to the upper surface of each of the pair of side walls 85 and 86 via screws 95. Avoid the clash of The base plate 7 has a rectangular recess 100 surrounded by the front wall 53, the rear wall 54, and the pair of side walls 85 and 86. The cam slide body 11 of the cam slide 3 is disposed in the rectangular recess 100 so as to be movable in the lateral direction H.

  Each of the front wall 53 and the rear wall 54 and a pair of side walls 85 and 86 integral with the front wall 53 and the rear wall 54 are integrally provided on the base 81, and the front wall 53 is provided with a huge portion 73. The enormous portion 73 is placed on the step portion 102 of the front wall 53 at the lower end of the longitudinal groove 101, and the rear wall 54 is the enormous portion 71 in the same manner as the front wall 53. The enormous portion 71 is placed on the step 104 of the rear wall 54 at the lower end of the longitudinal groove 103, and the combination of the cam slide 3 and the restoring force generating means 6 is provided. The body can be removed from the base 7 by loosening the screws 95 and removing the guide plates 96 and 97 from the upper surfaces of the pair of side walls 85 and 86, respectively.

  The sliding upper surfaces 91 and 92 of the sliding plates 23 and 24 may also be provided with a plurality of holes (recesses) in which a solid lubricant is embedded as necessary.

  In addition to the above, the base 7 is integrally provided with a support portion 113 on which a work plate 111 to be drilled is placed and supported, and in which a button die 112 is embedded. Is elastically held between the support member 113 and the presser member 114 that is moved up and down in synchronization with the cam driver 5 in drilling.

  In the press mold cam 1 described above, the cam driver 5 disposed at the original position (upward position) shown in FIG. 1 starts to be lowered when the work plate 111 is placed on and supported by the support portion 113. When the cam surface 4 of the cam driver 5 comes into contact with the cam surface 2 of the cam slide 3 by this lowering, the cam slide 3 starts to move from the original position shown in FIG. 1 as shown in FIGS. 37 is brought close to the workpiece plate 111. In this movement of the cam slide 3, the coil spring 51 in which one end portion 61 is in contact with the large-diameter spring seat surface 31 of the cam slide 3 and the other end portion 62 is in contact with the annular spring receiving plate 18. As shown in FIG. 5, as the cam slide 3 is moved without being compressed, no gradually increasing elastic restoring force for returning the cam slide 3 to the original position is generated. The coil spring 52 arranged so that is pressed against the small-diameter spring seat surface 32 of the cam slide 3 and the movement of the other end 64 is blocked by the spring seat surface 66 of the spring receiver 65 is also shown in FIG. Thus, a gradually increasing return force is generated that is gradually compressed in the lateral direction H to return the cam slide 3 to the original position.

  Further, when the cam slide 3 is moved by the lowering of the cam driver 5, the protrusion 76 of the spring receiver 65 comes into contact with the other end 62 of the coil spring 51 as shown in FIG. As a result of the other end 62 being pressed against the protrusion 76, the one end 61 is brought into contact with the large-diameter spring seat 31 of the cam slide 3, and the coil spring is prevented from moving relative to the cam slide 3. 51 begins to generate a gradually increasing return force that is gradually compressed to return the cam slide 3 to its original position. In this way, the coil spring 51 arranged so that the other end 62 is pressed against the protrusion 76 of the spring receiver 65 from the middle of the movement of the cam slide 3 is the cam slide by the coil spring 52 in the movement of the cam slide 3. 3, the return force of the cam slide 3 to the original position is increased with a delay from the increase of the return force of the cam slide 3 to the original position. A gradually increasing return force is generated to return the slide 3 to the original position, and this return force is applied to the cam slide 3. As shown in FIG. 8, the punch tool 37 penetrates the work plate 111 elastically held by the support member 113 and the presser member 114 that is moved up and down in synchronization with the cam driver 5 as shown in FIG. 8. Then, the workpiece plate 111 is punched and inserted into the button die 112.

  When a hole is made in the work plate 111 by the punch tool 37, the cam driver 5 starts to be raised, and the cam slide 3 also starts to be retracted. In this retraction of the cam slide 3, the punch tool 37 is pulled out from the drilled hole of the work plate 111 with a final pressure consisting of the resultant elastic force of the pair of coil springs 51 and 52. Further, the cam slide 3 is moved and returned to the original position shown in FIG. 1, and the cam driver 5 and the pressing member 114 are also arranged at the original positions (upward positions) as shown in FIGS.

  In the press mold cam 1, the return force generating means 6 has a pair of coil springs 51 and 52, and the pair of coil springs 51 and 52 generates the return force independently of each other. Therefore, a large final pressure can be obtained by the resultant force of the elastic forces of the pair of coil springs 51 and 52, and the pair of coil springs 51 and 52 are juxtaposed with each other, so that a wide installation place can be obtained. In addition, a pair of coil springs 51 and 52 are arranged so as to surround the holding rod 55, and the coil spring 51 located outside of the pair of concentrically arranged coil springs 51 and 52 is recessed. Since the coil spring 52 arranged at the place 33 and guided by the cam slide 3 and guided inside by the holding rod 55 is guided by the holding rod 55, the pair of coil springs 51 and 52 are prevented from being bent or drooped. Thus, buckling of the pair of coil springs 51 and 52 is prevented, the coil spring 52 generates a restoring force that gradually increases in the movement of the cam slide 3, and the coil spring 51 moves the cam slide 3. As a result of generating a restoring force that gradually increases from the middle of the coil, it is possible to obtain a large final pressure that is a combination of the restoring force due to the elastic force of the coil spring 51 and the restoring force due to the elastic force of the coil spring 52. As a result of generating the return force due to the elastic force 51 from the middle of the movement of the cam slide 3, it is only necessary to move the cam slide 3 to the middle against the gradually increasing return force by the coil spring 52. The cam slide 3 can be reliably moved, and the other end portion 64 of the coil spring 52 is spring-loaded 65 in the recess 77 surrounded by the annular protrusion 76. Because of the contact, the other end portion 64 of the coil spring 52 can be securely held. In addition, since the coil spring 51 is disposed in the recess 33, the surface of the cam slide 3 that defines the recess 33. Thus, the coil spring 51 can be securely held and space expansion due to the installation of the coil spring 51 can be prevented.

  In the press mold cam 1, a spring bearing 65 having an annular protrusion 76 that can enter the recess 33 is provided on the holding rod 55, and one end 61 is provided on the large-diameter spring seat surface 31 and the other end 62. The coil springs 51 are arranged in the recesses 33 by contacting the ring spring receiving plates 18 with each other, but instead of this, as shown in FIG. The holding rod 55 is provided adjacent to the enormous portion 73, while the coil spring 51 is disposed inside the coil spring 52 and the holding rod 55 is disposed between the spring receiver 121 and the small-diameter spring seat surface 32 in the moving direction of the cam slide 3. As shown in FIG. 10, as shown in FIG. 10, the cam slide 3 is pressed against the small-diameter spring seat surface 32 of the cam slide 3 from the middle of the movement, and the other end 62 is moved. Blocked by spring support 121 In this case, one end 63 of the coil spring 52 is brought into contact with the large-diameter spring seat 31 of the cam slide 3 at the recess 33 and the other end 64 is brought into contact with the spring receiver 121, respectively. The one end 63 is pressed against the small-diameter spring seat surface 32 of the cam slide 3 and the other end 64 is prevented from moving by the spring support 121. The coil spring 52 is gradually compressed with the initial movement of the cam slide 3 and generates a gradually increasing return force that returns the cam slide 3 to its original position. The movement of the slide 3 is arranged so that the return force of the cam slide 3 to the original position increases with a delay from the increase of the return force of the cam slide 3 to the original position by the coil spring 52.

  In the press mold cam 1 shown in FIG. 9, the return force generating means 6 has a pair of coil springs 51 and 52, and the pair of coil springs 51 and 52 generates the return force independently of each other. Therefore, a large final pressure can be obtained by the resultant force of the elastic forces of the pair of coil springs 51 and 52, and the pair of coil springs 51 and 52 are juxtaposed with each other. In addition, a pair of coil springs 51 and 52 are arranged so as to surround the holding rod 55, and the coil springs located outside the pair of coil springs 51 and 52 arranged concentrically are not required. 52 is arranged in the recess 33 and is guided by the cam slide 3, and the coil spring 51 located inside is guided by the holding rod 55, so that the pair of coil springs 51 and 52 are bent and drooped. In addition, the pair of coil springs 51 and 52 are prevented from buckling, and the coil spring 52 generates a restoring force that gradually increases as the cam slide 3 moves, and the coil spring 51 As a result of generating a return force that gradually increases from the middle of the movement of the movement 3, it is possible to obtain a large final pressure that combines the return force due to the elastic force of the coil spring 51 and the return force due to the elastic force of the coil spring 52, and As a result of generating the restoring force due to the elastic force of the coil spring 51 from the middle of the movement of the cam slide 3, the cam slide 3 is moved halfway against the gradually increasing restoring force of the coil spring 52. Therefore, the cam slide 3 can be reliably moved.

  In each of the press mold cams 1 described above, the return force of the cam slide 3 to the original position is delayed with respect to the increase of the return force of the coil spring 52 to the original position of the cam slide 3 in the movement of the cam slide 3. However, instead of this, as an example for reference, the return force to the original position of the cam slide 3 is increased simultaneously with the movement of the cam slide 3 as shown in FIG. The coil springs 51 and 52 may be arranged so as to generate them. That is, in the press mold cam 1 shown in FIG. 11, the coil springs 51 and 52 are respectively connected to the small-diameter spring seat surface 32 and the large-diameter spring seat surface 31 of the cam slide 3 at the one end portions 61 and 63, respectively. And the other end portions 62 and 64 are disposed in contact with the spring receiver 121, and thus the pair of coil springs 51 and 52 are arranged at one end portion 61 and Each of 63 is pressed by the cam slide 3 and the movement of the other end portions 62 and 64 is blocked by the spring receiver 121.

  According to the press mold cam 1 shown in FIG. 11, the return force generating means 6 has a pair of coil springs 51 and 52, and the pair of coil springs 51 and 52 makes the return force independent of each other. Therefore, a large final pressure can be obtained by the resultant force of the elastic force of the pair of coil springs 51 and 52, and the pair of coil springs 51 and 52 are juxtaposed with each other. Therefore, a large installation place is not required, and in addition, a pair of coil springs 51 and 52 are arranged so as to surround the holding rod 55, and are located outside of the pair of coil springs 51 and 52 arranged concentrically. Since the coil spring 52 is arranged in the recess 33 and is guided by the cam slide 3, and the coil spring 51 located inside is guided by the holding rod 55, the pair of coil springs 51 and 52 are bent. Sagging is prevented, so that the buckling of the pair of coil springs 51 and 52 is prevented.

  Further, in the press mold cam 1 shown in FIG. 11, the spring receiver 121 common to the pair of coil springs 51 and 52 is used. Instead, as a reference example, as shown in FIG. 3 includes a pair of spring receivers 121 and 122 that are spaced apart from each other with respect to the moving direction of 3, forming a holding rod 55, with one end 61 abutting against the small-diameter spring seat surface 32 of the cam slide 3 and the other end The portion 62 is brought into contact with the small-diameter spring receiver 122. Thus, when the cam slide 3 is moved, the one end portion 61 is pressed against the small-diameter spring seat surface 32 of the cam slide 3 and the movement of the other end portion 62 is the spring receiver. The coil spring 51 is disposed so as to surround the holding rod 55 so as to be blocked by the spring receiver 122 having a smaller diameter than 121, the one end 63 is brought into contact with the large-diameter spring seat surface 31 of the cam slide 3, and the other end Part 64 contacts spring receiver 121 Thus, when the cam slide 3 moves, the one end 63 is pressed against the large-diameter spring seat 31 of the cam slide 3 and the other end 64 is prevented from moving by the spring receiver 121. May be disposed concentrically on the outside of the coil spring 51 so as to surround the holding rod 55.

  Similar to that shown in FIG. 11, the coil springs 51 and 52 shown in FIG. 12 simultaneously increase the return force to the original position of the cam slide 3 as the cam slide 3 moves. The press mold cam 1 provided with 51 and 52 can obtain the same effect as the press mold cam 1 shown in FIG. 11 and can shorten the spring length of the coil spring 51. 3, the increase in the return force by the coil spring 51 can be increased.

  Incidentally, in any of the press mold cams 1 described above, a pair of coil springs 51 and 52 are provided surrounding the holding rod 55. Instead, as a reference example, as shown in FIG. The base 7 is configured by having a guide rod 131 that penetrates the slide 3 movably in the moving direction and is supported by the front wall 53 and the rear wall 54 and guides the movement of the cam slide 3. As shown in FIG. 14, the guide rod 131 is disposed around the guide rod 131, and the cam slide 3 is pressed against the front surface 17 of the cam slide 3 from the middle of the movement of the cam slide 3 and the other end 62 is moved forward. The press mold cam 1 may be configured by being arranged between the front wall 53 and the receding front surface 17 of the cam slide 3 so as to be blocked by the wall 53. In this case, the cam slide 3 The guide rod 131 is movable in the lateral direction H through a cylindrical bush 132 fixed to the guide rod 131, and one end portion 133 of the guide rod 131 is fitted in the through hole 134 of the front wall 53. The other end portion 135 of the guide rod 131 is fixed to the upper surface of the rear wall 54 with a screw 136, and the coil spring 52 is connected to the cam slide 3 at its one end portion 63 during the movement of the cam slide 3 as described above. One end 63 abuts against the spring seat surface 30 and the other end 64 so that the spring seat surface 30 is pressed and the movement of the other end portion 64 is blocked by the enormous portion 73 as a spring receiver. Is arranged in contact with the enormous portion 73.

  In the press mold cam 1 shown in FIG. 13, when the cam slide 3 is moved by the lowering of the cam driver 5, the coil spring 51 increases the return force of the cam slide 52 to the original position. On the other hand, the return force to the original position of the cam slide 3 increases with a delay, and the same effect as described above can be obtained.

  In the press mold cam 1 shown in FIG. 13, the base 7 may be configured by omitting the sliding plates 23 and 24, the pair of side walls 85 and 86, and the guide plates 96 and 97, and the press shown in FIG. Like the mold cam 1, the spring receiver 65 or 121 may be omitted, and the huge portion 73 may be used as a spring receiver instead of the spring receiver 65 or 121.

It is side explanatory drawing of a preferable example of embodiment of this invention. It is front explanatory drawing of the example shown in FIG. It is back surface explanatory drawing of the example shown in FIG. It is a partial explanatory view of the example shown in FIG. It is operation | movement explanatory drawing of the example shown in FIG. It is operation | movement explanatory drawing of the example shown in FIG. It is operation | movement explanatory drawing of the example shown in FIG. It is operation | movement explanatory drawing of the example shown in FIG. It is side surface explanatory drawing of the other preferable example of embodiment of this invention. It is operation | movement explanatory drawing of the example shown in FIG. It is side surface explanatory drawing of another preferable example of embodiment of this invention. It is side surface explanatory drawing of another preferable example of embodiment of this invention. It is side surface explanatory drawing of another preferable example of embodiment of this invention. It is operation | movement explanatory drawing of the example shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Press die cam 2, 4 Cam surface 3 Cam slide 5 Cam driver 6 Return force generating means

Claims (8)

  A movable cam slide having a cam surface and a punching tool for drilling a plate to be processed, a cam driver for moving the cam slide in contact with the cam surface of the cam slide, and processing by the punch tool The cam slide is returned to its original position after drilling in the plate, and a return force generating means for generating a gradually increasing return force for returning the cam slide to the original position in the movement of the cam slide; A holding rod that movably penetrates the cam slide and whose movement is restricted by the base with respect to the moving direction of the cam slide; At least a pair of coil springs that are juxtaposed to each other surrounding the holding rod and that generate elastic return forces independently of each other; The cam slide has a recess through which the holding rod passes, and the base has a front wall facing the front surface of the cam slide to which the punch tool is attached and a rear wall facing the rear surface of the cam slide. The holding rod is provided with a spring support and is disposed between the front wall and the rear wall, and is disposed concentrically and has a pair of coil springs opposite to each other in the winding direction. One of the coil springs having a large elastic coefficient is pressed against the spring support from the middle of the movement of the cam slide and returned to the original position of the cam slide by the other coil spring during the movement of the cam slide. The cam spring is arranged so that the return force to the original position of the cam slide is increased with a delay with respect to the increase in force. The end portion is arranged in contact with the spring support, and one end of the cam slide is pressed by the cam slide and the other end is blocked by the spring support. The press tool cam is configured such that the punch tool is pulled out from the drilled hole of the work plate with a final pressure composed of the resultant elastic force of the pair of coil springs.   2. The coil spring according to claim 1, wherein one of the pair of coil springs is disposed so that one end thereof is in contact with the rear portion of the cam slide and the other end is in contact with the front portion of the cam slide. Cam for press dies.   The spring receiver includes an annular protrusion that presses the other end of one coil spring in the movement of the cam slide, and a recess that is surrounded by the protrusion and accommodates the other end of the other coil spring. 3. The press die according to claim 2, wherein the other coil spring is disposed so that the other end thereof is brought into contact with the spring support in the recess and the movement of the other end is prevented. For cam.   One coil spring is disposed in the recess of the cam slide, with one end abutting on the rear portion of the cam slide and the other end contacting the front portion of the cam slide. The cam for a press die according to claim 2, wherein one end of the cam slide is arranged so as to be pressed against the cam slide.   The press mold cam according to claim 1, wherein one of the pair of coil springs is arranged so that the movement of the other end is blocked by the spring support from the middle of the movement of the cam slide.   The press mold cam according to claim 5, wherein the one coil spring is supported by the holding rod so as to be movable in a moving direction of the cam slide.   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 press according to any one of claims 1 to 6, wherein the cam slide is a hanging cam type, and a rectangular recess is formed in the base, and the cam slide is movably disposed in the rectangular recess. Mold cam.

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