JP2014161878A - Scrap discharger of press die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve work efficiency of discharging scrap that is generated in press processing.SOLUTION: A press die 13 has a lower die 11 of a stationary side and an upper die of a movable side which is vertically movable toward the lower die. A pierce punch 21 is disposed in the press die 13 as a shearing tool for shearing a plate material W. In the lower die 11, there are disposed a falling passage 31 for guiding scrap S sheared by the shearing tool to a lower part of the lower die 11, and an inclined passage 32 formed on the lower die 11 so as to be inclined downward. On the inclined passage 32, a scrap chute 36 is disposed for guiding the scrap S to an aperture 34. Both side parts of the scrap chute 36 are abutted against a projection 38 which is an abutting part.

Description

  The present invention relates to a press-type scrap discharge device for discharging scraps sheared from a workpiece by a press die to the outside of the press die.

  Examples of press processing using a panel material using a press die, that is, a plate material, as a workpiece include shearing processing, bending processing, drawing processing, and overhang processing. Shearing includes drilling, outer shape punching, shaving, and the like. Molding in which various moldings such as drawing and overhanging are combined is also called composite processing or composite molding. The press mold has a fixed lower mold and a movable upper mold, and the plate material is pressed by the upper mold and the lower mold.

  For example, a press processing line for a plate material such as a door panel constituting an automobile body is formed by arranging a single double action press die and a plurality of single action press dies in tandem. It is formed into a product shape while sequentially transporting toward the product. There are two types of plate material transport methods: transfer processing and progressive processing. The press line for transfer processing is equipped with a dedicated plate material clamp tool and a feed bar to which the clamp tool is attached, and automatically performs all processing. The plate material is conveyed to the process. In a press line for progressive processing, a strip-shaped plate material is left in each process while being sequentially sent to each process for pressing, and the product and scrap are sheared in the final process.

  The press die for drilling in the shearing process has a die provided in the lower die and a punch driven by the upper die, the form in which the punch is provided in the upper die, and the punch in the lower die. There is a form in which the upper cam is provided with a drive cam that is provided in the mold and drives the punch. In any form of the press die, a scrap discharge device is provided in the lower die in order to discharge the scrap separated and cut from the plate material by drilling with a die and a punch as a cutting blade to the outside of the press die. Yes. The press die for performing external punching and shaving in the shearing process is movable to shear the plate material by the fixed cutting edge provided on the lower mold and the fixed cutting edge driven by the upper mold. In order to discharge the scrap from the press mold to the outside, a scrap discharge device is provided in the lower mold.

  A press die having a fixed-side cutting edge provided on the lower die and a movable-side cutting blade provided on the upper die is described in Patent Document 1, and in this press die, scrap is discharged to the outside. A corrugated scrap chute is provided on the lower mold. In Patent Document 2, a moving guide for conveying scrap to the lower die is provided, and the driven cam provided on the moving guide is driven by the driving cam provided on the upper die to discharge the scrap. A scrap discharge device is described.

Japanese Utility Model Publication No. 63-145529 Japanese Utility Model Publication No. 61-21133

  In order to discharge scrap to the outside of the press mold, the lower mold has a scrap discharge path that guides the scrap to the lower part of the lower mold, and scrap that has fallen to the lower part of the scrap discharge path is placed outside the lower mold. A scrap chute is attached to the lower mold. The scrap guided by the scrap chute is discharged toward a scrap pit provided outside the lower mold.

  A conventional scrap chute has a bottom wall portion and side walls provided on both the left and right sides thereof, has a U-shaped cross section, and is inclined and attached to a scrap discharge path of a lower mold. However, the width dimension of the scrap chute and the width dimension of the scrap discharge path do not always coincide with each other due to an error in the width dimension of the scrap discharge path formed during casting of the lower mold and a manufacturing error of the scrap chute. For this reason, when a gap is generated between the outer surface of the side wall of the scrap chute and the inner surface of the scrap discharge path, small scrap may enter the gap. In particular, in a press die that punches a plate material, small scraps are generated, and such small scraps often enter gaps. When the scrap enters the gap, the inner surface of the scrap discharge path is a cast surface having irregularities during the casting of the lower mold, so that the scrap is hardly discharged from the gap. For this reason, when scrap enters the gap, it is necessary for the line operator to remove the scrap by hand, and there is a problem in that workability in the press die in which scrap is generated is poor.

  An object of the present invention is to improve the efficiency of discharging scrap generated in press working.

  The press-type scrap discharge device of the present invention has a fixed-side lower die and a movable-side upper die that can move up and down toward the fixed die, and is provided with a shearing tool for shearing a workpiece. A discharge device that is provided in the lower mold and guides the scrap sheared by the shearing tool to a lower portion of the lower mold, and is inclined downward to the lower mold in communication with the drop passage. An inclined passage formed, and a scrap chute that is attached to the inclined passage and guides scrap to the opening of the lower mold. The scrap chute is curved upward toward both sides, and the inclined chute is formed. The both side portions are brought into contact with a contact portion provided on the inner surface of the passage.

  The scrap chute attached to the lower inclined path is curved upward toward both side parts, and both side parts come into contact with a contact part provided on the inner surface of the inclined path. Therefore, even if a processing error occurs in the width dimension of the inclined passage and the width dimension of the scrap chute, both side portions of the scrap chute are prevented from coming into contact with the abutting portion to generate a gap therebetween. This prevents scrap generated by the shearing process from entering between the scrap chute and the inclined passage, and the scrap is surely discharged to the outside of the press die by the scrap chute and is a method for discharging the scrap from the press die. The scrap removal work by work becomes unnecessary, and the efficiency of the scrap discharge work is improved.

It is a perspective view which shows an example of the press type | mold provided with the scrap discharge apparatus. It is a top view of FIG. FIG. 3 is a perspective view showing the press-type crap discharging apparatus shown in FIGS. 1 and 2. FIG. 4 is an enlarged sectional view taken along line 4-4 in FIG. 3. FIG. 5 is a sectional view taken along line 5-5 in FIG. It is a partially expanded sectional view of FIG. It is a front view of a scrap chute. It is a front view which shows the scrap discharge device which is a modification. It is a front view which shows the scrap discharge device as a comparative example.

  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 lower mold 11 that is applied to press a workpiece, that is, a plate material W, as a door panel constituting an automobile body. Above the lower mold 11, as shown in FIG. 5, a movable-side upper mold 12 is arranged so as to be movable up and down, and the fixed mold-side lower mold 11 and the movable-side upper mold 12 are used to press the mold. 13 is configured. The upper die 12 is attached to a press ram (not shown) and is movable up and down as indicated by an arrow A in FIG. As shown in FIG. 1, the lower die 11 has a base die 14 and a forming die 15 attached to the upper surface thereof. The press die 13 is configured to process two plate materials W at the same time. Two molds 15 are provided. Guide rods 16 for guiding the upper die 12 are provided at the four corners of the base die 14 of the lower die 11, and the guide rod 16 is fitted to the upper die 12 so as to correspond to the guide rod 16 (not shown). Guide holes are provided.

  The press die 13 shown in FIG. 1 and FIG. 2 is applied for drilling a plate material W, and a through hole 17 is formed in the forming die 15 as shown in FIG. Is incorporated with a die 18 as a cutting edge. A pierce punch 21 that is inserted into the processing hole of the die 18 and drills the plate material W is provided in the cam unit 22. Each of the die 18 and the piercing punch 21 as a cutting blade constitutes a shearing tool, and the plate material W is subjected to drilling, that is, shearing. As shown in FIG. 5, the cam unit 22 includes a support block 23 attached to the upper mold 12 by a fastening member 20, and a cam slide 25 is movably mounted on a rod 24 provided on the support block 23. The pierce punch 21 is attached to the cam slide 25. A spring member (not shown) is incorporated in the cam slide 25, and a spring force in a direction away from the mold 15 is applied to the cam slide 25 by the spring member. A cam drive block 26 is attached to the base mold 14 of the lower mold 11. The cam drive block 26 is provided with a drive cam surface 28 that contacts a driven cam surface 27 provided on the lower surface of the cam slide 25.

  The press die 13 is arranged on a transfer processing press line, and the plate material W is conveyed to the forming die 15 of the lower die 11 by a clamp tool (not shown) and a feed bar to which the clamp tool is mounted.

  The press die 13 shown in FIGS. 1 and 2 is configured to perform two holes on each side of each plate W. In FIGS. 1 and 2, four cam units 22 are provided in the lower die 11. It is shown as being in contact with the cam surface 28 on the drive side. However, the number of cam units 22 provided in the press die 13 is not limited to the case illustrated. Note that the upper mold 12 is not shown in FIGS. 1 and 2.

  In order to make a hole in the plate material W by the press die 13, the plate material W is transported and arranged on the forming die 15 by a clamp tool (not shown), and the upper die 12 descends toward the lower die 11 in this state. Moved. The upper mold 12 is provided with a pad (not shown) for fixing the plate material W between the upper mold 12 and the lower mold 11. As the upper mold 12 moves downward, the cam surface 27 on the driven side of the cam slide 25 of each cam unit 22 contacts the cam surface 28 on the drive side on the lower mold side. As the upper die 12 continues to move downward, as shown by the arrow B, the cam slide 25 moves toward the plate material W, and the pierce punch 21 is inserted into the machining hole of the die 18. As a result, drilling is performed on the plate material W. FIG. 5 shows a state in which the piercing punch 21 is inserted into the machining hole of the die 18 and the plate material W is drilled. When the upper die 12 is lifted and moved away from the lower die 11 after the drilling is completed, the pierce punch 21 is driven away from the die 18 by the spring force of the spring member incorporated in the cam slide 25. After the pierce punch 21 is separated from the die 18, the cam unit 22 is moved above the lower die 11 by the upper die 12.

  As shown in FIG. 5, the cam unit 22 described above has a configuration in which a support block 23 and a cam slide 25 attached to the support block 23 in the axial direction are attached to the upper mold 12. As a form of the cam unit 22, there is a form in which only the support block 23 is attached to the upper die 12 and the cam slide 25 is movably attached to the cam drive block 26 of the lower die 11 as indicated by an arrow B. In this manner, the press die 13 may be provided with the cam unit 22 in a form in which the support block 23 and the cam slide 25 are separated.

  As shown in FIGS. 4 and 5, the lower mold 11 communicates with the through-hole 17 in a drop passage 31 for guiding the scrap S sheared by the pierce punch 21 as a shearing tool to the lower part of the lower mold 11. Is formed. An inclined passage 32 is formed in the lower mold 11 so as to be inclined downwardly in communication with the drop passage 31, and the bottom surface of the inclined passage 32 is flat as shown in FIGS. 5 and 6. As described above, the scrap discharge path 33 including the falling passage 31 and the inclined passage 32 is formed in the lower mold 11, and the opening 34 of the scrap discharge path 33 is provided in the lower mold 11. Four scrap discharge paths 33 are provided corresponding to the four dies 18 provided in the lower mold 11.

  As shown in FIG. 1, the drop passage 31 is covered with a cover 35, and FIGS. 3 and 4 show a state where the cover 35 is removed. A scrap chute 36 formed of an elastically deformable member such as a sheet metal is attached to the inclined passage 32. As shown in FIGS. 6 and 7, the scrap chute 36 is curved upward from the center in the width direction toward both sides, and between the both sides of the scrap chute 36 and the bottom surface of the inclined passage 32. Is provided with a gap 37. As shown in FIG. 4, the scrap chute 36 has a length substantially corresponding to the entire length of the inclined passage 32. Further, the width dimension of the scrap chute 36 is set in advance to be larger than the width dimension D of the inclined passage 32.

  As shown in FIGS. 4 to 6, a projection 38 is provided on the inner surface of the inclined passage 32 as a contact portion in parallel with the bottom surface of the inclined passage 32. When the scrap chute 36 is attached to the inclined passage 32, the left and right side portions of the scrap chute 36 come into contact with the protrusion 38 as the contact portion. As described above, the bottom surface of the inclined passage 32 is flat, whereas the scrap chute 36 is curved from the center in the width direction toward both sides. As a result, even if there is a molding error in the width dimension D of the inclined passage 32 during casting of the lower mold 11 and a processing error occurs in the width dimension of the scrap chute 36, the scrap chute 36 is inclined by the elastically deformed material. Therefore, when the scrap chute 36 is mounted on the inclined passage 32, the left and right side portions of the scrap chute 36 come into contact with the protrusions 38 as the contact portions. As a result, it is possible to prevent a gap from being generated between the protrusion 38 and both side portions of the scrap chute 36.

  Moreover, since the scrap chute 36 is a concave surface whose both sides are curved upward from the center, when the scrap S falls and collides with both sides in the width direction of the scrap chute 36, the scrap S is shown in FIG. Therefore, the scrap chute 36 is bounced back to the center in the width direction. This prevents the scrap S from being sandwiched between the protrusion 38 and the scrap chute 36.

  A tongue 41 is provided at the tip of the scrap chute 36, and the scrap chute 36 is fastened to the lower mold 11 by a screw member 42 that is attached to the tongue 41 and screwed to the lower mold 11. . Since both sides of the scrap chute 36 come into contact with the protrusions 38, the scrap chute 36 can be prevented from coming off the lower mold 11. However, when the scrap chute 36 is fastened to the lower die 11 by the screw member 42, when the lower die 11 vibrates when the punching is performed by the press die 13, the scrap chute 36 is reliably prevented from shifting. can do.

  FIG. 8 is a front view showing a scrap discharging apparatus as a modification. In this scrap discharging device, a concave groove 39 is formed as an abutting portion on the inner surface of the inclined passage 32, and when the scrap chute 36 is attached to the inclined passage 32, both sides of the scrap chute 36 are formed in the concave groove 39. It enters and contacts the concave groove 39. Thus, even if the contact portion is the concave groove 39, the scrap S can be reliably prevented from entering between the concave groove 39 and the scrap chute 36.

  As shown in FIG. 4, the inner end of the scrap chute 36 is flat and abuts against the inner surface of the lower end portion of the drop passage 31. A protrusion 38 and a concave groove 39 may be provided on the inner surface of the lower end portion 31.

  As shown in FIGS. 3 and 4, the lower die 11 has an external chute 43 for guiding the scrap S guided to the opening 34 of the lower die 11 by the scrap chute 36 to the outside of the lower die 11. Is installed. As shown in FIG. 2, four external chutes 43 are provided in the lower mold 11 so as to correspond to the openings 34 of the respective inclined passages 32. As shown in FIG. 3, the external chute 43 has a bottom wall portion 43 a and side wall portions 43 b integrated on both sides thereof, and has a U-shaped cross section. A rod 44 projects outwardly from the side wall 43b, and a bracket 45 is integrally provided on the lower mold 11 corresponding to both rods 44. The bracket 45 has a recess 46 into which the rod 44 enters. Is provided. Thus, the external chute 43 is detachably attached to the lower mold 11. Further, as shown in FIG. 3, guide fins 47 are arranged on the lower die 11 so as to be positioned on the left and right sides of the opening 34. Fastened to the lower mold 11.

  As shown in FIG. 4, the scrap S generated by drilling enters the drop passage 31 from the through hole 17 and falls onto the scrap chute 36 attached to the inclined passage 32. The dropped scrap S is guided to the scrap chute 36 and reliably supplied from the external chute 43 to the scrap pit 49 outside the press die 13 without entering between the scrap chute 36 and the inner surface of the inclined passage 32.

  FIG. 9 is a front view showing a scrap discharging apparatus as a comparative example. 9 shows a portion of the lower mold 11 similar to that of FIG. 7. In FIG. 9, members having commonality with the members shown in FIG. 7 are denoted by the same reference numerals.

  As shown in FIG. 9, the cross-sectional shape of the scrap chute 36 corresponds to the cross-sectional shape of the inclined passage 32, and has a U-shaped cross-section having a bottom wall portion 36 a and both side walls 36 b perpendicular to the bottom wall portion 36 a. Then, due to an error between the width dimension D of the inclined passage 32 and the width dimension E of the scrap chute 36, a gap 37 is generated between the inner surface of the inclined passage 32 and the scrap chute 36, and a projection 38 is provided on the inner surface of the inclined passage 32. Even so, it was inevitable that the scrap S entered the gap.

  On the other hand, as shown in FIGS. 7 and 8, if the scrap chute 36 is curved, even if an error occurs in the width of the inclined passage 32 and the scrap chute 36, The protrusions 38 and the concave grooves 39 as the contact portions can be brought into contact with each other, and the generation of a gap between the scrap chute 36 and the inclined passage 32 can be reliably prevented. As shown in FIG. 9, when the scrap S enters the gap 37, it is necessary for the line operator to manually remove the scrap, and there is a problem that workability in the press die in which the scrap is generated is poor. In the scrap discharging apparatus of the present invention, since the scrap S is prevented from entering the gap 37, the scrap removal work is eliminated, and the workability of the press die can be improved. In addition, it is not necessary to finish the casting surface of the inclined passage 32 of the lower mold 11 into a mirror surface by post-processing, and the manufacturing cost of the press mold 13 can be reduced.

  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. The illustrated press die 13 is applied to perform a drilling process as a shearing process on the plate material W. However, the press mold 13 is not limited to the drilling process as long as the scrap S is generated. The present invention can also be applied to a press die for performing a shearing process.

11 Lower mold 12 Upper mold 13 Press mold 14 Base mold 15 Mold 16 Guide rod 17 Through hole 18 Die 21 Pierce punch 22 Cam unit 23 Support block 25 Cam slide 26 Cam drive block 31 Drop passage 32 Inclination passage 33 Scrap discharge passage 34 Opening 36 Scrap chute 38 Protrusion 43 External chute S Scrap W Plate (work)

Claims (5)

A press-type scrap discharging device having a fixed lower mold and a movable upper mold movable up and down to the fixed mold, and provided with a shearing tool for shearing a workpiece;
A drop passage provided in the lower mold and guiding the scrap sheared by the shearing tool to a lower portion of the lower mold;
An inclined passage formed in communication with the drop passage and inclined downward in the lower mold;
A scrap chute mounted on the inclined passage and guiding scrap to the opening of the lower mold,
A press-type scrap discharging apparatus, wherein the scrap chute is curved upward toward both side portions, and the both side portions are brought into contact with a contact portion provided on an inner surface of the inclined passage.   2. The press-type scrap discharging apparatus according to claim 1, wherein the contact portion is a protrusion with which a side portion of the scrap chute contacts or a concave groove with which the scrap chute enters and contacts.   3. The press-type scrap discharging apparatus according to claim 1, wherein an external chute is provided in the lower die for guiding the scrap guided to the opening of the lower die by the scrap chute to the outside of the lower die. Mold scrap discharger.   The press-type scrap discharging apparatus according to any one of claims 1 to 3, wherein the shearing tool moves toward the die by a die provided in the lower die and a vertical movement of the upper die. This is a press-type scrap discharging device that consists of a piercing punch that drills a workpiece.   5. The press-type scrap discharge device according to claim 4, wherein the pierce punch is provided on a cam slide movably mounted on a support block provided on the upper die, and the upper die moves toward the lower die. A press-type scrap discharging device, wherein a cam drive block that guides the cam slide toward the die is provided in the lower die.

Images