JP2014061533A - Die release lifter and die release device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a die release lifter and a die release device, superior in installation workability to a press die, and capable of setting a higher preload.SOLUTION: The present invention comprises a lift block 3 for pushing up a flange 601 of a work 60 stuck to a lower die 61, the die release lifter 2 for energizing the lift block 3 in the upper direction and a distance piece 5 for adjusting the operation starting timing of the die release device 1. In the die release lifter 2, a coil spring 22 is arranged between an end plate 24 fixed to a lower end surface 231 of a holder 23 and a lift block installing surface 211 of a slide pipe 21 vertically moving in the holder 23 by placing the lift block 3. The preload of the coil spring 22 can be adjusted by fastening of a bolt 26 with a hexagonal hole inserted into a bolt hole 213 of the lift block installing surface 211 and a screw hole 252 formed on a tip surface of a shaft 25 with a flange 251 inserted into a through-hole 241 of the end plate 24.

Description

  The present invention relates to a release lifter that is used to push up a press-molded work and release the work from a lower mold, and a mold release device that releases the work from the lower mold using the release lifter.

  2. Description of the Related Art Conventionally, there has been known a mold release device that pushes up a workpiece such as a thin metal plate attached to a lower mold during press forming and releases the workpiece from the lower mold.

  6 (A), 6 (B), and 6 (C) are views (sectional views) for explaining the operation principle of the conventional mold release device 8. FIG. Here, FIG. 6A shows the arrangement relationship of each component of the mold release device 8 at the top dead center before press molding, and FIG. 6B shows the mold release device 8 at the bottom dead center. FIG. 6C shows the arrangement relationship of each component of the mold release device 8 at the top dead center after press molding.

  As shown in the figure, the conventional release device 8 urges the lift block 80 upward, and a lift block 80 for pushing up the flange 901 of the work 90 attached to the lower mold 91 during press molding. A mold release lifter 81, a nest block 82 for setting the length of a flange 901 formed on the edge of the workpiece 90 by regulating the lower limit position of the bending blade 93 interlocked with the upper mold 92, and a mold release device 8 and a distance piece 83 for adjusting the operation start timing.

  The lift block 80 has an L shape with a flange 801 and moves up and down while sliding the flange 801 with the side surface 911 of the lower mold 91.

  The release lifter 81 has a slide pipe 811 on which the lift block 80 is mounted and fixed, a coil spring 812 that urges the slide pipe 811 upward, and a slide pipe 811 that can move in the vertical direction. A holder 813 that holds the slide pipe 811 and the coil spring 812, an end plate 814 that functions as a spring seat for the coil spring 812, a stop block 815 that regulates the upper limit position of the slide pipe 811, and an end plate on the lower end surface of the holder 813 A plurality of bolts 816 for fixing 814.

  The slide pipe 811 is a cylindrical member having an upper surface 8111, and a lift block 80 is attached to the upper surface 8111. Along with the slide pipe 811, the lift block 80 moves in the vertical direction while sliding the flange 801 with the side surface 911 of the lower mold 91.

  The coil spring 812 is accommodated in the slide pipe 811, one end 8121 abuts on the inner wall of the upper surface 8111 of the slide pipe 811, and the other end 8122 protrudes from the lower end opening 8113 of the slide pipe 811. To do.

  The holder 813 is a cylindrical member, and an end plate 814 is fixed to the lower end side with bolts 816. The slide pipe 811 is accommodated in the holder 813, and the other end portion 8122 of the coil spring 812 accommodated in the slide pipe 811 is in contact with the upper surface of the end plate 814.

  The stop block 815 is disposed on the upper end side of the holder 813 and comes into contact with a contact portion 8112 formed on a side surface of the slide pipe 811 urged upward by the coil spring 812, whereby the upper limit position of the slide pipe 811 is reached. To regulate.

  The nest block 82 is mounted and fixed on the lift block 80, and the workpiece 90 is positioned with respect to the bending blade 93 by receiving the workpiece 90. As a result, the length of the flange 901 formed at the edge of the workpiece 90 is determined.

  The distance piece 83 is a cylindrical member, and is fixed to the lower surface 931 of the bending blade 93 so as to come into contact with the center portion of the upper surface 821 of the nest block 82 when the bending blade 93 is lowered. The length of the distance piece 83 is determined in accordance with the operation start timing of the mold release device 8 (timing at which the distance piece 83 contacts the upper surface 821 of the nest block 82).

  Here, as shown in FIG. 6A, the distance piece 83 is not in contact with the nest block 82 at the top dead center. As a result, the slide pipe 811 is in contact with the restoring force of the coil spring 812. The portion 8112 is pushed upward from the holder 813 to a position where it abuts against the stop block 815. Further, the flange 801 of the lift block 80 forms a slight gap with the work 90 disposed on the lower mold 91.

  In this state, when the upper die 92 starts to descend, the bending blade 93 starts to descend accordingly. Then, prior to the contact between the work 90 disposed on the lower die 91 and the upper die 92, the distance piece 83 fixed to the lower surface 931 of the bending blade 93 comes into contact with the nest block 82, and the coil spring 812 is moved. While further compressing, the nest block 82 and the slide pipe 811 are pushed down. As a result, the lift block 80 is lowered while maintaining a certain distance from the bending blade 93.

  Thereafter, the upper die 92 comes into contact with the workpiece 90 and sandwiches the workpiece 90 between the lower die 91. As a result, the upper die 92 stops descending, but the bending blade 93 continues to descend and bends the edge of the workpiece 90 downward. Thereby, the flange 901 is press-molded at the edge of the workpiece 90. Thereafter, as shown in FIG. 6B, the slide pipe 811 comes into contact with the end plate 814 at the bottom dead center, so that the bending blade 93 stops descending.

  Next, when the upper die 92 starts to rise, along with this, the bending blade 93 also starts to rise and leaves the workpiece 90. Further, the lift block 80 keeps a certain distance from the bending blade 93 by the contact between the nest block 82 mounted on the lift block 80 and the distance piece 83 fixed to the lower surface 931 of the bending blade 93. Ascending by the restoring force of the coil spring 812. Then, the flange 801 of the lift block 80 pushes up the flange 901 of the work 90 and releases the work 90 from the lower mold 91.

  Further, when the bending blade 93 rises together with the upper die 92, the abutting portion 8112 of the slide pipe 811 comes into contact with the stop block 815, whereby the lift block 80 stops rising, and the distance piece 83 moves from the nest block 82. Leave. Then, as shown in FIG. 6C, the upper die 92 and the bending blade 93 stop rising at the top dead center.

  Patent Document 1 discloses a press mold releasing device that can shorten the lift stroke (push-up length) when the work flange is pushed up to release the work from the lower mold.

JP 2000-051978 A

  By the way, in the conventional mold release apparatus 8, the assembly | attachment of the mold release lifter 81 to the press metal mold | die was performed in the following way. That is, the end plate 814 is fixed to the lower end side of the holder 813 with a bolt. Further, the coil spring 812 is accommodated in the slide pipe 811. At this time, one end portion 8121 of the coil spring 812 contacts the inner wall of the upper surface 8111 of the slide pipe 811, and the other end portion 8122 is exposed from the lower end side of the slide pipe 811. Then, the coil spring 812 and the slide pipe 811 are accommodated in the holder 813 so that the other end portion 8122 of the coil spring 812 contacts the upper surface of the end plate 814. Then, while the slide pipe 811 is pushed into the holder 813 until the contact portion 8112 formed on the side surface of the slide pipe 811 is positioned inside the holder 813, the stop block 815 is placed on the upper end side of the holder 813 in that state. Install. The release lifter 81 created as described above is fixed to the lower mold 91 using a jig or the like (not shown).

  In this way, the release lifter 81 needs to attach the stop block 815 to the upper end side of the holder 813 while pushing the slide pipe 811 into the holder 813 against the restoring force of the coil spring 812, and the workability is poor. . In particular, when this operation is performed manually, the slide pipe 811 is manually pushed into the holder 813, so that the coil spring 812 is preloaded (with the contact portion 8112 of the slide pipe 811 in contact with the stop block 815. It is difficult to increase the load applied to the coil spring 812. For this reason, for example, in order to release a large workpiece 90 such as a vehicle body panel from the lower die 91, many release devices 8 must be installed, which is complicated.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a mold release lifter and a mold release apparatus that have good workability in assembling work to a press mold and can set a higher preload. It is in.

  In order to solve the above-described problems, in the present invention, a shaft inserted into a coil spring that generates a force for peeling a workpiece from one mold and a preload means for preloading the coil spring are provided. The shaft and the preload means are formed with a male screw and a female screw that are screwed together, and a coil spring is preloaded by tightening the male screw and the female screw.

For example, the release lifter of the present invention is a release lifter that urges a lift block for separating a workpiece attached to one mold from the mold during press molding processing in the direction of separating.
A cylindrical slide pipe having one end face to which the lift block is attached;
A coil spring whose one end is in contact with the slide pipe and urges the slide pipe in the direction of moving away and
A cylindrical holder that holds the slide pipe and the coil spring so that the slide pipe can reciprocate in the direction of separation and the opposite direction;
An end plate that is attached to one end surface of the holder, abuts against the other end of the coil spring, and functions as a spring seat of the spring;
A shaft passing through the through hole of the coil spring and the end plate;
Preloading means for preloading a coil spring in which the shaft is inserted,
The shaft and the preload means are formed with a male screw and a female screw that are screwed to each other, and the maximum separation distance between the one end surface of the slide pipe and the end plate is fastened by the male screw and the female screw. Is regulated.

  According to the release lifter of the present invention, a male screw and a female screw that are screwed to each other are formed on a shaft inserted into a coil spring that generates a force for peeling a workpiece from one mold and a preloading means that preloads the coil spring. The coil spring is preloaded by tightening. For this reason, the workability of the assembling work to the press mold is good. Moreover, higher preload can be applied even by human power.

FIG. 1 is a cross-sectional view of a mold release device 1 according to an embodiment of the present invention. 2A is a top view of the release lifter 2, FIG. 2B is a cross-sectional view taken along the line AA of the release lifter 2 shown in FIG. 2A, and FIG. FIG. 3 is a bottom view of the release lifter 2. FIGS. 3A, 3 </ b> B, and 3 </ b> C are diagrams (cross-sectional views) for explaining the operation principle of the mold release device 1. FIG. 4A and FIG. 4B are diagrams for explaining another configuration example of the release lifter 2. FIG. 5A and FIG. 5B are diagrams for explaining another configuration example of the release lifter 2. 6 (A), 6 (B), and 6 (C) are views (sectional views) for explaining the operation principle of the conventional mold release device 8. FIG.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view of a release device 1 according to the present embodiment. Here, the arrangement | positioning relationship of each component of the mold release apparatus 1 in the top dead center after press molding is shown.

  As shown in the figure, the release device 1 includes a lift block 3 for pushing up a flange 601 of a workpiece 60 such as a thin metal attached to the lower die 61 during press molding, and a lift block 3 attached upward. The nest block 4 for setting the length of the flange 601 formed on the edge of the workpiece 60 by restricting the lower limit position of the bending lifter 63 interlocked with the upper mold 62 and the releasing mold lifter 2 And a distance piece 5 for adjusting the operation start timing of the mold apparatus 1.

  The lift block 3 has an L shape with a flange 31, and is screwed to a wrist block mounting surface 211 of a slide pipe 21 (to be described later) provided in the release lifter 2, so that the flange 31 is connected to the side surface of the lower mold 61. It moves up and down together with the slide pipe 21 while sliding with 611.

  The nest block 4 is fixed in a state of being placed on the lift block 3, and the workpiece 60 is positioned with respect to the bending blade 63 by contacting the edge 602 of the workpiece 60 (FIG. 3A). reference). Thereby, the length L1 of the flange 601 formed in the edge part 602 of the workpiece | work 60 is determined.

  The distance piece 5 is a cylindrical member, and is fixed at a predetermined position on the lower surface 631 of the bending blade 63 so as to come into contact with the central portion of the upper surface 41 of the nest block 4 when the bending blade 63 descends. The length L2 of the distance piece 5 is determined according to the operation start timing (timing at which the distance piece 5 contacts the nest block 4) of the release device 1 depending on the workpiece 60.

  The release lifter 2 pushes up the lift block 3 and pushes up the flange 601 of the work 60 attached to the lower die 61 during press molding.

  2A is a top view of the release lifter 2, FIG. 2B is a cross-sectional view taken along the line AA of the release lifter 2 shown in FIG. 2A, and FIG. FIG. 3 is a bottom view of the release lifter 2.

  As shown in the figure, the release lifter 2 includes a slide pipe 21 on which the lift block 3 is placed and fixed on the upper surface 211, a coil spring 22 that urges the slide pipe 21 upward, a slide pipe 21 and a coil. A holder 23 that holds the spring 22 and guides the slide pipe 21 in the vertical direction, an end plate 24 that functions as a spring seat of the coil spring 21, a shaft 25 that regulates the upper limit position of the slide pipe 21, and the coil spring 22 Hexagon socket head cap screw 26 for applying preload, a plurality of bolts 27 for fixing the end plate 24 to the lower end surface 231 of the holder 23, and a spring guide for regulating the tightening amount of the hexagon socket head cap screw 26 And a retainer 28.

  The slide pipe 21 is a cylindrical member having a lift block mounting surface 211 at the upper end, and a screw hole 212 for screwing the lift block 3 is formed in the lift block mounting surface 211. By fastening the screw hole 212 to a fixing screw (not shown), the lift block 3 is fixed to the lift block mounting surface 211 of the slide pipe 21, and the flange 31 is connected to the side surface 611 of the lower mold 61 in conjunction with the slide pipe 21. Move up and down while sliding. Further, a bolt hole 213 for the hexagon socket head bolt 26 is formed at the center of the lift block mounting surface 211 of the slide pipe 21.

  The coil spring 22 is accommodated in the slide pipe 21, one end 221 abuts against the inner wall 215 of the lift block mounting surface 211 of the slide pipe 21, and the other end 222 is the lower end opening of the slide pipe 21. Protrudes from 214.

  The holder 23 is a cylindrical member, and a plurality of screw holes 232 for screwing the end plate 24 with bolts 27 are formed in the lower end surface 231 thereof.

  The end plate 24 is a disk-like member having a through hole 241 for inserting the shaft 25 at the center, and has an outer diameter substantially the same as the outer diameter of the holder 23. Further, bolt holes 244 are formed in the end plate 24 at positions corresponding to the screw holes 232 of the lower end surface 231 of the holder 23. The bolt 27 is fastened to the screw hole 232 of the lower end surface 231 of the holder 23 through these bolt holes 244 so that the end plate 24 blocks one opening (opening on the lower end surface 231 side) of the holder 23. It is fixed to the lower end surface 231 of the holder 23.

  Here, the slide pipe 21 in which the coil spring 22 is accommodated is accommodated in the holder 23 with the lift block mounting surface 211 protruding from the other opening of the holder 23 (opening on the upper end surface 233 side). The other end 222 of the coil spring 22 protruding from the lower end side opening 214 is in contact with the upper surface 243 of the end plate 24 fixed to the lower end surface 231 of the holder 23. A space between the upper surface 243 of the end plate 24 fixed to the lower end surface 231 of the holder 23 and the inner wall 215 of the lift block mounting surface 211 of the slide pipe 21 is provided with a hexagonal hole with a spring guide retainer 28 interposed, as will be described later. By adjusting the screw part 261 of the bolt 26 and the screw hole 252 of the shaft 25, the coil spring 22 is adjusted to be shorter than the natural length. Thus, the coil spring 22 accommodated in the slide pipe 21 is compressed between the inner wall 215 of the lift block mounting surface 211 of the slide pipe 21 and the upper surface 243 of the end plate 24 attached to the lower end surface 231 of the holder 23. Preloaded.

  The shaft 25 is slidably inserted into the through hole 241 of the end plate 24 and further inserted into the coil spring 22 in the holder 23. A flange 251 having a diameter larger than that of the through hole 241 is provided on the outer periphery of one end of the shaft 25 so that the shaft 25 does not come out from the through hole 241 of the end plate 24 toward the slide pipe 21. Further, a screw hole 252 that is screwed into the hexagon socket head bolt 26 is formed in the other end surface of the shaft 25.

  The hexagon socket head cap screw 26 is inserted into the bolt hole 213 of the lift block mounting surface 211 of the slide pipe 21, and the screw portion 261 is screwed into the screw hole 252 on the other end surface of the shaft 25 located in the coil spring 22. To do. Thereby, preload is applied to the coil spring 22.

  The sling guide retainer 28 has an inner diameter larger than the diameter of the screw hole 252 provided in the shaft 15 and smaller than the diameter of the shaft 25, and the inner wall 215 side of the bolt hole 213 provided in the lift block mounting surface 211 of the slide pipe 21. And a threaded portion 261 of the hexagon socket head cap screw 26 is inserted. The spring guide retainer 28 is interposed between the lower surface of the head of the hexagon socket head bolt 26 and the end surface of the shaft 25 where the screw hole 252 is provided, whereby the screw portion 261 of the hexagon socket head bolt and the screw hole 252 of the shaft. And the vertical position of the slide pipe 21 with respect to the end plate 24 is adjusted, and the maximum distance between the upper surface 243 of the end plate 24 and the inner wall 215 of the lift block mounting surface 211 of the slide pipe 21 is adjusted. The separation distance, that is, the compression amount of the coil spring 22 can be defined. Thereby, the preload applied to the coil spring 22 and the upper limit position of the slide pipe 21 can be defined.

  In the present embodiment, the other end 222 of the coil spring 22 is received by the upper surface 243 of the end plate 24, but the other end of the coil spring 22 (not shown) is received by the upper surface 243 of the end plate 24. A washer for receiving 222 may be arranged. Further, the flange 251 of the shaft 25 is brought into contact with the end plate 24 via a washer (not shown). For example, the preload of the coil spring 22 and the upper limit of the slide pipe 21 are supplementarily determined by the thickness, the number of the washers, and the like. The position may be adjustable.

  Next, the operation of the mold release apparatus 1 having the above configuration will be described.

  FIGS. 3A, 3 </ b> B, and 3 </ b> C are diagrams (cross-sectional views) for explaining the operation principle of the mold release device 1. Here, FIG. 3A shows an arrangement relationship of each component of the mold release device 1 at the top dead center before press molding, and FIG. 3B shows the mold release device 1 at the bottom dead center. FIG. 3C shows the arrangement relationship of each component of the mold release device 1 at the top dead center after press forming.

  As shown in FIG. 3 (A), the distance piece 5 is not in contact with the nest block 4 at the top dead center. As a result, the slide pipe 21 is moved by the restoring force of the coil spring 22 to the flange 251 of the shaft 25. Is pushed upward from the opening on the upper end surface 233 side of the holder 23 to a position where it contacts the end plate 24. At this time, the end surface of the flange 31 of the lift block 3 is adjusted so as to be flush with the upper surface of the lower mold 61 (the surface on which the workpiece 60 is disposed).

  In this state, when the upper die 62 starts to descend, the bending blade 63 starts to descend accordingly. Prior to the contact between the upper die 62 and the work 60 disposed on the lower die 61, the distance piece 5 fixed to the lower surface 631 of the bending blade 63 comes into contact with the nest block 4, and the coil spring 22 is moved. While compressing, the nest block 4, the lift block 3 and the slide pipe 21 are pushed down as a unit. As a result, the lift block 3 is lowered while maintaining a certain distance from the bending blade 63.

  Thereafter, the upper die 62 comes into contact with the workpiece 60 and sandwiches the workpiece 60 between the lower die 61. As a result, the upper mold 62 stops descending, but the bending blade 63 continues to descend, and the nest block 4, lift block 3, slide pipe 21, hexagon socket head bolt 26, spring guide retainer 28 and shaft 25 are integrated. While pushing down, the edge 602 of the workpiece 60 is bent downward. As a result, the flange 601 is press-formed on the edge 602 of the workpiece 60. Thereafter, as shown in FIG. 3B, the lower end surface 216 of the slide pipe 21 comes into contact with the upper surface 243 of the end plate 24 at the bottom dead center, so that the bending blade 63 stops descending.

  Next, when the upper mold 62 starts to rise, the bending blade 63 also starts to rise and moves away from the work 60. When the distance piece 5 rises as the bending blade 63 rises, the slide pipe 21 rises while pushing up the lift block 3 and the nest block 4 by the restoring force of the coil spring 22, and the head of the hexagon socket head bolt 26. The shaft 25 and the hexagon socket head cap bolt 26 are pulled up by engaging the H.262 with the bolt hole 213 of the lift block mounting surface 211 of the slide pipe 21. At this time, due to the contact between the nest block 4 placed on the lift block 3 and the distance piece 5 fixed to the lower surface 631 of the bending blade 63, the lift block 3 has a certain distance from the bending blade 63. Ascend while keeping. Then, the flange 31 of the lift block 3 that is being lifted pushes up the flange 601 of the workpiece 60 to release the workpiece 60 from the lower die 61.

  Further, when the bending blade 63 rises together with the upper mold 62, the flange 251 of the shaft 25 comes into contact with the end plate 24 and prevents the slide pipe 21 from rising. Thereby, the lift of the lift block 3 is also stopped and the distance piece 5 is separated from the nest block 4. Then, as shown in FIG. 3C, the upper die 62 and the bending blade 63 stop rising at the top dead center.

  The embodiment of the present invention has been described above.

  In the release lifter 2 according to the present embodiment, the upper surface 243 of the end plate 24 fixed to the lower end surface 231 of the holder 23 and the lift of the slide pipe 21 that moves the holder 23 in the vertical direction on the lift block 3. The coil spring 22 is arranged between the inner wall 215 of the block mounting surface 211 and the amount of tightening between the screw hole 252 of the shaft 25 and the screw part 261 of the hexagon socket head bolt 26 is regulated by the spring guide retainer 28. Thus, the maximum separation distance between the lift block mounting surface 211 of the slide pipe 21 and the inner wall 215 of the lift block mounting surface 211 of the slide pipe 21 can be adjusted.

  That is, a shaft 25 in which a flange 251 having a larger diameter than the through hole 241 is formed on the outer periphery of one end is inserted into the through hole 241 of the end plate 24, and the shaft 25 is inserted into the coil spring 22. At the same time, the hexagon socket head bolt 26 is inserted into the bolt hole 213 of the lift block mounting surface 211 of the slide pipe 21, and the screw portion 261 of the hexagon socket head bolt 26 is inserted into the spring guide retainer 28. Then, the screw portion 261 of the hexagon socket head cap screw 26 is tightened into the screw hole 252 formed on the other end face of the shaft 25. For this reason, the end plate 24 and the lift block mounting surface 211 of the slide pipe 21 are formed by regulating the tightening amount of the screw hole 252 of the shaft 25 and the screw part 261 of the hexagon socket head cap bolt 26 by the spring guide retainer 28. The distance between the flange 251 of the shaft 25 to be sandwiched and the head 262 of the hexagon socket head bolt 26 is defined, the preload of the coil spring 22 can be adjusted to a predetermined value, and the workability of the assembly work to the press die is improved. Good. Further, even by human power, a higher preload can be applied to the coil spring 22 by tightening the screw portion 261 of the hexagon socket head bolt 26 into the screw hole 252 of the shaft 25, so that the work 60 is sufficiently peeled from the lower die 61. Force can be generated. Further, since the upper limit position of the slide pipe 21 is restricted by the flange 251 of the shaft 25 coming into contact with the end plate 24, it is not necessary to attach a stop block to the upper end side of the holder 23, and the contact with the stop block is not necessary. It is not necessary to form the contact portion on the side surface of the slide pipe 21.

  In addition, this invention is not limited to said embodiment, Many deformation | transformation are possible within the range of the summary.

  In the above embodiment, the shaft 25 in which the flange 251 is formed on the outer periphery of one end and the screw hole 252 is formed on the other end, and the hexagon socket head cap screw that is screwed into the screw hole 252 of the shaft 25. 26 is used to preload the coil spring 22 that generates a restoring force for releasing the press-formed workpiece 60 from the lower die 61 by tightening the screw hole 252 of the shaft 25 and the hexagon socket head cap screw 26. However, such a configuration is not necessarily required if the compression amount of the coil spring 22 can be adjusted by tightening the male and female screw portions.

  For example, as shown in FIG. 4A, a flange 255 is formed on the outer periphery of one end portion 253, and a screw portion 256 is formed on the other end portion 254, and a screw portion 256 of the shaft 25A The coil spring 22 may be preloaded by tightening the screw portion 256 of the shaft 25 </ b> A and the adjustment nut 28 using the adjustment nut 28 to be screwed. In this case, for example, a countersink through hole 217 into which the shaft 25A is inserted is formed at the center of the lift block mounting surface 211 of the slide pipe 21, and a flange 255 of the shaft 25A inserted into the countersink through hole 217 is formed. It engages with the counterbore through hole 217. Then, the adjustment nut 28 is tightened into the threaded portion 256 of the shaft 25 </ b> A that passes through the spring coil 22 and protrudes from the through hole 241 of the end plate 24.

  Further, in the above embodiment, the bolt hole 213 is formed in the lift block mounting surface 211 of the slide pipe 21, and the hexagon socket head bolt 26 is inserted into the bolt hole 213. FIG. As shown, a disk 29 in which a bolt hole 291 for a hexagon socket head bolt 26 is formed as a disk 29 that receives one end 221 of the coil spring 22 in the slide pipe 21 is used as one end 221 of the coil spring 22. The screw portion 262 of the hexagon socket head cap screw 26 is screwed into the screw hole 252 on the other end face of the shaft 25 located in the coil spring 22 through the bolt hole 291 of the disk 29, One end 221 side of the coil spring 22 may be accommodated in the slide pipe 21.

  Further, instead of forming the flange 251 on the outer periphery of one end of the shaft 25, another member that does not pass through the through hole 241 of the end plate 24 may be fixed to one end of the shaft 25. For example, a disk having a diameter larger than that of the through hole 241 of the end plate 24 may be fixed to one end surface of the shaft 25 with a screw or the like. Further, instead of forming the flange 251 on the outer periphery of one end portion of the shaft 25, a thread groove is formed, and an engagement nut is screwed into the thread groove, and the engagement nut is connected to the upper end surface 211 of the slide pipe 21. The bolt holes 213 may be engaged with each other. Alternatively, a screw hole is formed in the inner wall 215 of the upper surface 211 of the slide pipe 21, and a screw groove is formed in one end of the shaft 25 instead of the flange 251. 21 may be engaged.

  In the above embodiment, one end 221 contacts the inner wall 215 of the upper end surface 211 of the slide pipe 21, and the other end 222 protrudes from the lower end surface 216 of the slide pipe 21 and contacts the upper surface 243 of the end plate 24. As shown in FIG. 5A, the coil spring 22 is accommodated in the slide pipe 21. One end 221a abuts the lower end surface 216 of the slide pipe 21a and the other end 22a is the end plate 24. The coil spring 22 a may be interposed between the slide pipe 21 a and the end plate 24 so as to contact the upper surface 243. The slide pipe 21a has such a length that the slide pipe 21a is not completely pulled out of the holder 23 even when the slide pipe 21a is pushed out from the end face 233 of the holder 23 to the maximum by the coil spring 22a. Further, in this case, as in the slide pipe 21b shown in FIG. 5B, by reducing the inner diameter and increasing the area of the lower end surface 216 of the slide pipe 21a, the one end 221a of the coil spring 22a slides more reliably. You may enable it to contact | abut with the lower end surface 216 of the pipe 21a.

  In the above embodiment, the holder 23 may be formed integrally with the end plate 24 to form a cylindrical member with a bottom.

  Further, in the above embodiment, the nest block 4 may be omitted, and the distance piece 5 may be in direct contact with the lift block 3.

  In the above embodiment, the end plate 24 may be covered with a cap so that dust does not adhere to the portion of the shaft 25 protruding from the through hole 241 of the end plate 24.

  In the above embodiment, the shape of the slide pipe 21 and the holder 23 is not limited to a cylindrical shape, and may be a cylindrical shape.

  Further, in the above embodiment, the workpiece 60 attached to the lower die 61 during the press molding process is removed from the lower die 61 by pushing up the flange 601 formed on the edge 602 of the workpiece 60 with the lift block 3. The release device 1 for releasing the mold has been described as an example, but the present invention is not limited to this. INDUSTRIAL APPLICABILITY The present invention is widely applicable to a mold release lifter that urges a lift flock in a direction in which a work attached to a mold during press forming is pushed away from the mold and a mold release apparatus using the mold lifter. .

  1: Release device, 2: Release lifter, 3: Lift block, 4: Nest block, 5: Distance piece, 21, 21a, 21b: Slide pipe, 22, 22b: Coil spring, 23: Holder, 24: End Plate, 25: Shaft, 26: Hex socket head bolt, 27: Bolt, 28: Spring guide retainer, 29: Disc, 31: Flange, 60: Workpiece, 61: Lower mold, 62: Upper mold, 63: Bending blade, 211: Upper surface of the slide pipe, 212: Screw hole, 213: Bolt hole, 214: Opening on the lower end side of the slide pipe, 215: Inner wall on the upper surface of the slide pipe, 216: Lower end surface of the slide pipe, 221, 221a: Coil spring One end of each, 222, 222a: the other end of the coil spring , 231 and 233: end face of holder, 232: screw hole, 241: through hole, 243: upper surface of end plate, 244: bolt hole, 251: flange, 252: screw hole, 253, 254: end of shaft, 261: Threaded portion of hexagon socket head bolt, 262: Head of hexagon socket head cap screw, 601: Flange, 631: Lower surface of bending blade

Claims (8)

A release lifter for urging a lift block for pushing and separating the work attached to one mold from the mold in the press molding process in the direction of separating and separating,
A cylindrical slide pipe having one end face to which the lift block is attached;
A coil spring whose one end is in contact with the slide pipe and urges the slide pipe in the direction of moving away and
A cylindrical holder that holds the slide pipe and the coil spring so that the slide pipe can reciprocate in the direction of separation and the opposite direction;
An end plate that is attached to one end surface of the holder, abuts against the other end of the coil spring, and functions as a spring seat of the spring;
A shaft passing through the through hole of the coil spring and the end plate;
Preloading means for preloading a coil spring in which the shaft is inserted,
The shaft and the preload means are formed with a male screw and a female screw that are screwed to each other, and the maximum separation distance between the one end surface of the slide pipe and the end plate is fastened by the male screw and the female screw. Release lifter characterized in that is regulated. The release lifter according to claim 1,
The coil spring is
One end is in contact with the inner wall of the one end face of the slide pipe, and the other end protrudes from the other end face side of the slide pipe, and is accommodated in the slide pipe. Release lifter. The release lifter according to claim 1,
The coil spring is
The mold release is characterized in that one end is disposed between the slide pipe and the end plate so that the other end is in contact with the other end surface of the slide pipe and the other end is in contact with the end plate. Lifter. A release lifter according to any one of claims 1 to 3,
The shaft is
A flange is formed at one end that penetrates the through hole of the end plate, and the female screw is formed at the other end.
Bolt holes are formed on the one end face side of the slide pipe,
The preload means includes
It is a bolt having the male screw inserted into the bolt hole on the one end face side of the slide pipe and screwed with the female screw formed on the other end side of the shaft. Release lifter. The release lifter according to claim 4,
The preload means includes
A spring guide retainer for regulating a tightening amount of the female screw and the male screw by being interposed between the shaft-side surface of the bolt head and the bolt-side end surface of the shaft; Release lifter characterized by that. A release lifter according to any one of claims 1 to 3,
The shaft is
The male screw is formed at one end portion that penetrates the through hole of the end plate,
The preload means includes
The mold release lifter characterized by being an adjustment nut having the female screw threadably engaged with the male screw formed at one end of the shaft. A release lifter according to any one of claims 1 to 6,
The release plate, wherein the end plate is formed integrally with the holder. A mold release device for releasing the workpiece attached to one mold from the mold during press molding,
A release lifter according to any one of claims 1 to 7,
A lift block installed on the one end face of the slide pipe of the release lifter and for separating the work attached to the one mold during the press molding process from the mold,
A distance piece for adjusting the operation start timing of the release lift,
The distance piece is
Moves in conjunction with the other mold, and when the other mold moves in a direction opposite to the attaching / detaching direction with respect to a reference position by a predetermined value or more, the lift block is brought into contact with and separated from the lift block. A mold release device that moves in the opposite direction.

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