JP6013937B2 - Press-type workpiece peeling device - Google Patents

Description

  The present invention relates to a press-type workpiece peeling apparatus for peeling a workpiece after pressing from a press die and preventing the workpiece from sticking to the press die.

  A press die is used to make a plate material or the like a workpiece, that is, a workpiece, and apply an external force to the workpiece. The press mold has a lower mold that is a fixed mold and an upper mold that is a movable mold. The press mold applies an external force to the work to plastically deform the work or cut the work. As a result, a predetermined product is formed. Pressing includes bending, drawing, overhanging, shearing, etc., with the workpiece facing the lower die abutting surface with the workpiece placed on the lower die abutting surface The workpiece is pressed by the upper die and the lower die by moving the upper die provided with the abutting surface toward the lower die.

  For example, a molded product such as a roof panel that constitutes an automobile body is formed by using a rolled plate as a workpiece and drawing or stretching it with a press die. When press working is performed, the workpiece is in close contact with the workpiece abutting surfaces of both the lower die and the upper die. Therefore, when the upper die is moved backward to separate both dies, May stick to the workpiece abutting surface of the mold.

  In order to prevent the workpiece from sticking to the workpiece abutting surface of the lower die or the upper die when the lower die and the upper die are separated after press working, Patent Document 1 describes the lower die and the upper die. A spring plunger attached to the mold is described. A spring plunger as a workpiece peeling device has a movable pin that is reciprocally incorporated in a cylinder and a coil spring that applies a spring force in a protruding direction to the movable pin. The structure is in sliding contact with. When the spring plunger is attached to the upper die, the workpiece is pushed out from the upper die toward the lower die when the upper die is moved upward. When the spring plunger is attached to the lower die, the workpiece is raised when the upper die is moved upward. Is lifted from the lower-surface workpiece abutment surface.

  Patent Document 2 describes a molded product push-up device in which a lifter is provided on a lower die to push up a workpiece from the lower die when the lower die and the upper die are separated after press working.

Utility Model Registration No. 3059531 Japanese Utility Model Publication No. 61-36332

  If the workpiece is pressed while foreign matter such as chips remains attached to the workpiece, irregularities are generated on the surface of the workpiece, resulting in poor surface quality. In addition, when the workpiece is pressed under the condition that foreign matter remains on the press-molded surface of the mold, the surface quality of the workpiece becomes poor. When a spring plunger is provided on the mold as described in Patent Document 1, sliding debris becomes a foreign matter due to sliding contact between the movable pin and the bush at the tip of the cylindrical body when the movable pin reciprocates. May occur. If the sliding residue adheres to the workpiece, the surface quality of the workpiece becomes poor, and the yield of press working is reduced.

  In the product lifting device described in Patent Document 2, when the workpiece is lifted and moved by the lifter after the workpiece is processed, the lower die press molding is performed after the workpiece is lifted by blowing air from the nozzle onto the press molding surface of the lower die. The foreign matter left on the surface is forcibly blown away by the air from the nozzle. Therefore, in order to prevent sliding debris, which is a foreign matter generated from the spring plunger, from adhering to the workpiece, if air is blown to the spring plunger after the press processing is completed, the foreign matter generated from the spring plunger on the press molding surface Can be prevented from adhering to the workpiece.

  However, since the press die is provided with a plurality of spring plungers, if a plurality of nozzles are provided in the press die in order to blow off foreign matter generated from each spring plunger, the press die has a complicated structure. End up.

  The objective of this invention is providing the workpiece | work peeling apparatus in which a foreign material does not scatter on a workpiece | work butting surface.

  The press-type workpiece peeling device of the present invention is a press-type workpiece peeling device having a lower die provided with a workpiece abutting surface and an upper die provided with a workpiece abutting surface opposite to the workpiece abutting surface. A movable pin that is reciprocally mounted in an axial direction in a storage chamber provided in the lower mold so as to open to the workpiece abutting surface; and a direction that protrudes from the workpiece abutting surface to the movable pin. A spring member that applies a spring force and separates the workpiece after pressing from the workpiece abutting surface and an exhaust passage that communicates with the storage chamber, and when the movable pin is pushed back by the workpiece and moves backward A check valve for exhaust that discharges foreign matter in the storage chamber, a check valve for supply of air that is provided in an air supply flow path that communicates with the storage chamber and introduces outside air when the movable pin protrudes and moves; Have

  After pressing the workpiece with a press die having an upper die and a lower die, when the upper die is moved away from the lower die, the movable pin protrudes from the workpiece abutment surface even if the workpiece sticks to the lower die Work piece sticking is prevented. When the sliding debris is generated by the sliding contact between the guide portion for guiding the movable pin and the movable pin, the sliding debris is scraped down into the accommodation chamber. The scraped scraps are discharged from the storage chamber to the outside by the exhaust passage, and the sliding scraps are prevented from being scattered on the workpiece abutting surface.

It is a perspective view which shows an example of the press type | mold with which the workpiece | work peeling apparatus was provided. It is the sectional view on the AA line in FIG. It is an expansion perspective view of the B section in FIG. 2, and shows the state which shape | molded the workpiece | work with the press die. It is sectional drawing which shows the workpiece | work peeling apparatus provided in the press die. It is sectional drawing which shows the workpiece | work peeling apparatus in the state which the movable pin is moving backward from the protrusion limit position shown in FIG. It is sectional drawing which shows the workpiece | work peeling apparatus in the state which the movable pin protrudes and moves from the retreat limit position. (A) is sectional drawing which shows the upper end part of a workpiece | work peeling apparatus, (B) is sectional drawing which shows the upper end part of the workpiece | work peeling apparatus of a modification.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 and FIG. 2 show a fixed side mold or lower mold 11 which is applied to draw a plate material as a roof panel constituting a car body as a work, that is, a workpiece. Above the lower mold 11, a movable mold, that is, an upper mold is disposed so as to be movable up and down, and the upper mold is not shown in FIGS. 1 and 2. A press die 12 is constituted by the lower die 11 and the upper die. The lower mold 11 has a base portion 13 and a main body portion 14, and the plate material W is carried on a work abutting surface 15 provided on the upper surface of the main body portion 14 by a transport device (not shown). The workpiece abutting surface 15 has a molding surface 15a that is curved upward and corresponding to the shape of the roof panel, and a fastening surface 15b provided around the molding surface 15a.

  In FIG. 3, a part of the upper die 16 for drawing the plate material W in cooperation with the lower die 11 is indicated by a two-dot chain line. The upper die 16 is provided with a workpiece abutting surface 17 opposite to the workpiece abutting surface 15 of the lower die 11, and the workpiece abutting surface 17 has a molding surface 17a curved in a concave shape corresponding to the molding surface 15a, and And a fastening surface 17b provided around the periphery.

  In order to press the plate material W with the press die 12 having the lower die 11 and the upper die 16, the plate material W is carried onto the upper surface of the lower die 11, that is, the workpiece abutting surface 15 by a conveying device (not shown). Under this state, the upper die 16 is moved downward toward the lower die 11, and the plate material W is pressed between both workpiece abutting surfaces 15 and 17. After the press working is finished, the upper die 16 is driven upward to leave the lower die 11. Of the plate material W, the product is mainly produced by the parts 15a and 17a of the workpiece abutting surfaces 15 and 17, and the outer periphery of the plate material W is separated from the product portion by subsequent shearing. Is done.

  The molding surface 15a of the lower mold 11 has a convex shape upward, and when the pressing of the plate material W is finished and the upper mold 16 is driven upward, the plate material W is placed on the workpiece abutting surface 15 of the lower mold 11. There is a tendency to remain stuck. Therefore, as shown in FIGS. 1 and 2, the lower mold 11 is provided with a plurality of workpiece peeling devices 20 positioned on the fastening surface 15 b.

  FIG. 3 shows one of the plurality of workpiece peeling devices 20 shown in FIGS. 1 and 2. FIG. 4 is an enlarged cross-sectional view of the workpiece peeling apparatus 20 shown in FIG.

  An attachment hole 21 is formed in the lower die 11 so as to open to the clamping surface 15b of the workpiece abutting surface 15, and a cylindrical body 22 is incorporated in the attachment hole 21. As shown in FIG. 4, in the form in which the outer peripheral surface of the cylindrical body 22 is flat as illustrated, the cylindrical body 22 is press-fitted into the mounting hole 21. On the other hand, in the form in which the external thread is formed on the outer peripheral surface of the cylindrical body 22, the cylindrical body 22 is screwed to the internal thread provided in the attachment hole 21.

  A housing chamber 24 is provided inside the cylindrical body 22 through a housing hole 23, and a movable pin 25 is mounted in the housing chamber 24 so as to be capable of reciprocating in the axial direction. A hemispherical extrusion surface 26 is provided at the distal end of the movable pin 25, and a large-diameter flange 27 is integrally provided at the proximal end thereof. The movable pin 25 reciprocates between a projecting limit position where the pushing surface 26 at the tip protrudes from the fastening surface 15b and a retreating limit position where the pushing surface 26 substantially coincides with the fastening surface 15b.

  A compression coil spring 28 as a spring member is mounted in the storage chamber 24, and one end of the compression coil spring 28 abuts on the flange 27 and the other end abuts on the bottom surface of the attachment hole 21. A spring force is applied to the movable pin 25 by the compression coil spring 28 in the direction in which the pushing surface 26 protrudes from the tightening surface 15b.

  In order to restrict the protruding limit position of the movable pin 25 and guide the vertical movement of the movable pin 25, a bush 31 is attached to the upper end portion of the accommodation hole 23 as an annular guide portion. The bush 31 is inserted into the accommodation hole 23 of the cylindrical body 22 and is abutted against the stepped portion 32. An annular packing 33 made of rubber is attached to the inner end surface of the bush 31, and the inner peripheral surface of the packing 33 is in sliding contact with the outer peripheral surface of the movable pin 25.

  When the plate material W is pressed by the press die 12, the plate material W is carried onto the upper surface of the lower die 11, that is, the workpiece abutting surface 15. At this time, as shown in FIG. 4, the movable pin 25 is pushed out to the projecting limit position. In FIG. 4, a state in which the plate material W is in contact with the distal end surface of the movable pin 25 is indicated by a two-dot chain line. In this state, when the upper die 16 is moved backward toward the lower die 11, the movable pin 25 is pushed back through the plate material W by the upper die 16 and moved backward.

  FIG. 5 shows a state in which the movable pin 25 is pushed down by the upper die 16. FIG. 6 shows a state in which the press working is finished, the upper die 16 is driven upward, and the plate material W is peeled off from the fastening surface 15 b by the movable pin 25.

  When the movable pin 25 moves in the axial direction, the movable pin 25 is in sliding contact with the inner peripheral surface of the bush 31, and fine sliding residue is generated as a foreign matter from the sliding surface of the bush 31 and the movable pin 25. There are things to do. In particular, when the movable pin 25 is pushed back by the upper die 16 and moved backward, an external force is applied to the movable pin 25 by the upper die 16 in the radial direction, so that the outer peripheral surface of the movable pin 25 is the inner periphery of the bush 31. It will hit one side so as to be pressed against the surface. For this reason, the amount of sliding debris generated due to the contact of the movable pin 25 is larger than when the movable pin 25 projects and moves.

  An exhaust hole 34 is formed in the lower mold 11 so as to communicate with the storage chamber 24 in order to discharge the sliding residue falling into the storage chamber 24 to the outside. An exhaust passage 35 is formed in the exhaust hole 34. Communicate. The exhaust passage 35 is provided with an exhaust check valve 37 that contacts the valve seat 36, and a spring force in the direction toward the valve seat 36 is applied to the check valve 37 by a spring member 38. When the movable pin 25 is pushed back by the plate material W and moves backward, the check valve 37 opens the exhaust passage 35 and discharges the foreign matter in the storage chamber 24 together with the internal air to the outside. On the other hand, when the movable pin 25 projects and moves, the check valve 37 closes the exhaust passage 35. As described above, the sliding residue dropped into the storage chamber 24 is discharged to the outside through the exhaust passage 35 as indicated by the arrow in FIG. The sliding residue remaining in the chamber 24 is prevented from rising and leaking to the tightening surface 15b side.

  In order to introduce clean outside air into the storage chamber 24, an air supply hole 41 is formed in the lower mold 11 so as to communicate with the storage chamber 24, and an air supply channel 42 communicates with the air supply hole 41. . An air supply check valve 44 that contacts the valve seat 43 is provided in the air supply passage 42, and a spring force in the direction toward the valve seat 43 is applied to the check valve 44 by a spring member 45. . The check valve 44 closes the air supply channel 42 to prevent foreign matter in the storage chamber 24 from flowing into the air supply channel 42 when the movable pin 25 is moved backward by being pushed by the plate material W. On the other hand, when the movable pin 25 projects and moves, the check valve 44 opens the air supply passage 42 and external air is introduced into the storage chamber 24 as shown in FIG.

  In order to clean the external air introduced from the air supply passage 42 into the storage chamber 24, a filter 46 is provided in the air supply passage 42. Therefore, when the movable pin 25 projects and moves, the external air supplied through the air supply passage 42 is purified by the filter 46 and introduced into the storage chamber 24 by the pump action of the movable pin 25.

  As each of the check valves 37 and 44 described above, a sphere is used. However, the check valves 37 and 44 may have other forms such as a reed valve made of a plate-like member. Anyway. The lower mold 11 is provided with an exhaust hole 34 and an air supply hole 41, but one communication hole is provided in the lower mold 11, and the exhaust passage 35 and the air supply path 42 are communicated with the communication hole. May be.

  The movable pin 25 is provided with a small-diameter portion 53 between a large-diameter portion 51 on the proximal end side and a large-diameter portion 52 on the distal end side. Both large diameter portions 51 and 52 have the same diameter, and the small diameter portion 53 has a smaller diameter than the large diameter portions 51 and 52. The inner peripheral surface at the inner end portion of the bush 31 is a straight hole 54 having the same inner diameter as a whole, and the inner peripheral surface at the outer end portion of the bush 31 has a large diameter toward the workpiece abutting surface 15. Thus, the tapered surface 55 is formed. As shown in FIG. 4, when the movable pin 25 moves to the projecting limit position, a gap 56 is formed between the small-diameter portion 53 and the inner peripheral surface of the bush 31 facing the small-diameter portion 53.

  Even if the sliding debris attached to the movable pin 25 moves in the projecting direction due to the projecting movement of the movable pin 25, the sliding debris is captured in the gap 56. Scattering toward the surface is prevented. On the other hand, when the movable pin 25 moves backward, the sliding residue captured in the gap 56 is sent into the storage chamber 24 by the movable pin 25. Further, when the movable pin 25 protrudes from the retreat limit position, as shown in FIG. 6, the sliding residue adhering to the outer peripheral surface of the movable pin 25 is scraped off by the packing 33 and falls into the accommodation chamber 24. To do. As described above, the sliding residue taken into the storage chamber 24 is discharged to the outside from the exhaust passage 35 by the pump action when the movable pin 25 moves backward.

  FIG. 7A is a cross-sectional view showing the upper end of the workpiece peeling device. As illustrated, the length of the bush 31 in the axial direction is L, the length of the straight hole 54 is L2, and the length of the tapered surface 55 is L1. On the other hand, when the length in the axial direction of the large diameter portion 52 of the movable pin 25 is M and the dimension in the axial direction of the packing 33 is N, the length M of the large diameter portion 52 is longer than the length L of the bush 31. The length L of the bush 31 and the dimension N of the packing 33 are set to be longer. Therefore, as indicated by a two-dot chain line in FIG. 6, when the movable pin 25 moves to the retreat limit position, the small diameter portion 53 enters the storage chamber 24. Thereby, the sliding residue adhering to the small-diameter portion 53 is scraped off by the packing 33 that contacts the movable pin 25 that protrudes and moves.

  FIG. 7B is a cross-sectional view showing an upper end portion of a workpiece peeling apparatus which is a modified example. In this workpiece peeling apparatus, the inner peripheral surface of the bush 31 is a straight surface having the same diameter as a whole. Between the large-diameter portions 51 and 52 of the movable pin 25, a tapered surface 57 whose diameter decreases toward the protruding end of the movable pin 25 is provided. When moved to the position, a gap 56 is formed between the inner peripheral surface of the bush 31 and the tapered surface.

  As described above, when the small-diameter portion 53 and the tapered surface 57 are provided in the central portion in the axial direction of the movable pin 25, the sliding debris that sticks to and moves on the movable pin 25 when the movable pin 25 projects is moved into the gap 56. The trapped sliding residue is fed into the storage chamber 24 by the backward movement of the movable pin 25. As the shape of the gap 56, the taper surfaces 55, 57 increase the width of the movable pin 25 on the workpiece abutting surface 15 side rather than the proximal end side, that is, the inner side, thereby enhancing the sliding scrap capturing effect. be able to. However, as shown in FIG. 7A, a small-diameter portion 53 having a constant outer diameter is provided on the movable pin 25, and the inner peripheral surface of the bush 31 is a straight surface as shown in FIG. 7B. As a result, even if the gap 56 is formed, the sliding residue can be captured.

  The workpiece peeling apparatus 20 described above has a cylindrical body 22 and a storage chamber 24 is formed by the cylindrical body 22. A storage hole 23 is formed in the lower mold 11, and a movable pin 25 and a compression coil are formed therein. If the spring 28 is incorporated, the workpiece peeling device 20 is directly incorporated into the lower mold 11 without providing the cylindrical body 22. Further, the bush 31 as the guide portion is press-fitted into the cylindrical body 22, but the guide portion may be formed integrally with the cylindrical body 22 at the upper end portion of the cylindrical body 22. In the form in which the workpiece peeling device 20 is incorporated directly into the lower mold 11, when the guide part is formed integrally with the lower mold 11, the movable pin 25 and the compression coil spring 28 are mounted from below the lower mold 11.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, although the illustrated workpiece peeling apparatus 20 is applied to a press die 12 for drawing the plate material W, the present invention is also applied to a press die for performing other press processing such as overhang processing and deep drawing processing. The invention can be applied.

11 Lower mold 12 Press mold 15 Work abutting surface 15a Molding surface 15b Tightening surface 16 Upper mold 17 Work abutting surface 20 Work peeling device 21 Mounting hole 22 Cylindrical body 24 Housing chamber 25 Movable pin 28 Compression coil spring 31 Bush 33 Packing 35 Exhaust flow path 37 Check valve 42 Supply air flow path 44 Check valve 46 Filters 51, 52 Large diameter portion 53 Small diameter portion 54 Straight hole 55 Tapered surface 56 Clearance

Claims (5)

A press-type workpiece peeling device having a lower die provided with a workpiece abutting surface and an upper die provided with a workpiece abutting surface facing the workpiece abutting surface,
A movable pin that is reciprocally mounted in the axial direction in a storage chamber provided in the lower mold so as to open to the workpiece abutting surface;
A spring member that applies a spring force in a direction protruding from the workpiece abutting surface to the movable pin, and peels the workpiece after pressing from the workpiece abutting surface;
An exhaust check valve that is provided in an exhaust flow path communicating with the storage chamber and discharges foreign matter in the storage chamber when the movable pin is pushed backward by the work,
A press-type workpiece peeling device, which is provided in an air supply passage communicating with the storage chamber and has a check valve for supplying air when the movable pin protrudes and moves.   2. The press-type workpiece peeling apparatus according to claim 1, wherein when the movable pin moves to a projecting limit position, sliding between a proximal end side of the movable pin and a guide portion for guiding the movable pin. A press-type workpiece peeling device provided with a gap for collecting waste.   The press-type workpiece peeling apparatus according to claim 2, wherein a taper surface having a large diameter toward the workpiece abutting surface is provided in the guide portion, and the taper surface is formed when the movable pin moves to a projecting limit position. A press-type workpiece peeling device in which a small-diameter portion that faces and forms the gap is provided on the movable pin.   3. The press-type workpiece peeling apparatus according to claim 2, wherein a taper surface having a diameter that decreases toward the protruding end portion is provided on the movable pin, and the inner periphery of the guide portion when the movable pin moves to a protruding limit position. A press-type workpiece peeling apparatus that forms the gap between a surface and the tapered surface. 5. The press-type work peeling apparatus according to claim 1, wherein a filter for cleaning external air introduced into the storage chamber is provided in the air supply channel. 6. .

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