JP2006297406A - Structure and method for discharging scrap of press die - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure and a method for discharging scraps of a press die capable of consistently discharging scraps while ensuring the working accuracy and the lifetime of the die. <P>SOLUTION: The scrap discharging structure comprises a lower die body 10 having a lower blade 17 on an opening edge of a void 16 opened from a side part 15 to a work supporting face 11, and an upper blade 20 to cut a cutout part 105 forming scraps S in cooperation with the lower blade 17 in an advancing/retracting manner in the void 16 through the elevating/lowering motion. A bend blade 31 to receive the scraps S, a bend deformation providing part 40 formed on a tip of the upper blade 20, and a kicker 35 to push out and discharge the scraps S supported by the bend blade 31 from the void 16. The scraps S received and supported by the bend blade 31 are pressed and bent by the bend deformation providing part 40, and pushed out and discharged from the void 16 by the kicker 35. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a scrap discharging structure and a scrap discharging method of a press die, and more particularly, a lower die body including a lower blade formed at an opening edge of a space that opens from a side portion to a work supporting surface. The present invention also relates to a scrap discharging apparatus and a scrap discharging method for a press die having an upper blade for cutting scrap from a workpiece in cooperation with the lower blade.

  For example, as shown in the perspective view of FIG. 9, the top surface 102 and the peripheral surface 103 that gradually spreads outward as it descends from the outer periphery 102 a of the top surface 102, and spread outward from the outer periphery 103 a of the peripheral surface 103. A bathtub-shaped section having a substantially hat-shaped cross-section in which an annular flange surface 104 is formed, and is substantially U-shaped in plan view from the edge 104a of the flange surface 104 to the top surface 102 through the flange surface 104 and the peripheral surface 103. When press-molding a molded product 101 which is a sheet metal product in which a U-shaped notch 105 is formed, as shown in FIG. 10, the circumference gradually spreads outward as it descends from the outer periphery 102a of the top surface 102. The bathtub-shaped intermediate molded product 100 formed with the surface 103 and the flange surface 104 extending outward from the outer periphery 103a of the peripheral surface 103 is press-molded.

  Then, the portion 105a of the notch 105 is cut and removed along the trim line indicated by the broken line a from the intermediate molded product 100 to be a workpiece by press working to obtain the intended molded product 101 shown in FIG.

  As shown in FIG. 11, the press mold for trimming used in this press working includes a lower mold main body 110, pads provided on an upper mold (not shown) that descends and rises facing the lower mold main body 110, and An upper blade 120 is provided.

  The lower mold body 110 includes an upper portion 112 corresponding to the top surface 102 of the intermediate molded product 100, a peripheral surface portion 113 extending outwardly from the outer periphery 112a of the upper portion 112 to the peripheral surface 103, and a flange surface from the outer periphery 113a of the peripheral surface portion 113. 104 has a work support surface 111 with a raised central portion formed of an annular flange surface portion 114 extending outward, and one end is opened to the side portion 115 of the lower mold main body 110, and the side portion 115 is opened. A pair of side walls 116b that continuously face each other in the vertical direction from the side opening portion 116a through the flange surface portion 114 and the peripheral surface portion 113 to the upper portion 112, and a back wall 116c that connects the inner side of the mold of both side walls 116b. A void 116 is formed as a scrap discharge portion that continuously opens in the vertical direction in a U shape or a U shape in plan view. A lower blade 117 extending continuously in a U shape or a U shape in plan view is formed along the opening edge of the space 116 formed by the corner between the space 116 and the work support surface 111. .

  On the other hand, the upper blade 120 provided in the upper mold enters the void 116 with a predetermined clearance from the lower blade 117 formed on the lower mold body 110 in accordance with the lowering operation of the upper mold, and It retreats from the void 116 by the ascending operation.

  Then, the top surface 102, the peripheral surface 103, and the flange surface 104 of the intermediate molded product 100 are overlaid on the upper portion 112, the peripheral surface portion 113, and the flange surface portion 114 of the lower mold main body 110, and the intermediate molded product 100 is fitted to the work support surface 111. Position and set.

  With the intermediate molded product 100 set on the lower mold main body 110, the intermediate molded product 100 is pressed against the work support surface 111 of the lower mold main body 110 by a pad that descends as the upper mold descends. As shown in the sectional view taken along the line III-III of FIG. 11 in accordance with the pressing and further lowering operation of the upper die, the cutout portion 105a is formed along the trim line a by the cooperation of the upper blade 120 and the lower blade 117. Cutting and punching are performed to obtain a molded product 101 in which the notch 105 is cut out from the intermediate molded product 100.

  On the other hand, the notched portion 105a punched out by the upper blade 120 is further pushed down as the scrap S by the upper blade 120 descending in the void 116 to the bottom dead center position and discharged from the void 116. After that, the press by the pad is released by the upward movement of the upper die, and the upper blade 120 is retracted from the space 116 and the molded product 101 is carried out of the press die.

  However, the scrap S that is punched out by the upper blade 120 and falls in the void 116 may be brought into contact with and fitted between the opposing side walls 116b of the void 116, thereby preventing the smooth discharge of the scrap S. If the smooth discharge of the scrap S is hindered, the press working efficiency is lowered, and the scrap S is lifted upward from the void 116, and the lower blade 117 and the upper blade 120 are severely damaged and worn. In addition, the molded product 101 may cause scratches such as dents and scratches.

  As a countermeasure, for example, as shown in a cross-sectional view corresponding to FIG. 12 in FIG. 13, the opposing side wall 116b of the cavity 116 formed in the lower mold main body 110 is gradually separated from the lower blade 117 side as it moves downward. Is provided with a clearance angle, that is, a clearance angle θ, to avoid contact between the scrap S and the side wall 116b or to reduce the contact range, thereby suppressing interference between the scrap S and the side wall 116b, and the scrap S between the opposing side walls 116a. It is known that the scrap S can be discharged well by avoiding the insertion of the S.

  Further, as schematically shown in FIG. 14, a guide hole 121 is formed at the tip of the upper blade 120, and a pressing member 125 arranged so as to be able to appear and retract in the guide hole 121 is constantly urged in a protruding direction by a spring 124. It is also known that the scrap S is positively discharged from the void 116 by pushing out the scrap S punched out by the upper blade 120 with a pressing member 125 biased by a spring 124.

  Furthermore, by forming a protrusion that protrudes upward from the lower surface in advance at the site to be punched as scrap, the scrap presses into the die hole as the scrap punched by the punch and die hole flattens, and the scrap rises. It is also known to prevent (see, for example, Patent Document 1).

JP 2000-158056 A

  As shown in FIG. 13, by providing clearance angles θ that gradually move away from the lower blade 117 side to the opposing side walls 116b of the void 116 formed in the lower mold body 110, the side walls 116b and The interference with the scrap S is reduced and the scrap S is not fitted between the side walls 116b, and the scrap S can be discharged smoothly.

  However, since the clearance angle θ is provided on the side wall 116b, the clearance between the lower blade 117 and the upper blade 120 formed on the edge of the side wall 116b increases with wear or repeated polishing of the lower blade 117 due to use, There is a concern that dripping or burring on the cut surface, burrs or the like may occur and the processing accuracy of the molded product 101 may be reduced, and wear of the lower blade 117 and the upper blade 120 may be promoted, leading to a reduction in mold life.

  Further, as shown in FIG. 14, by providing a pressing member 125 that is constantly urged in the protruding direction by the spring 124 at the tip of the upper blade 120, the scrap S punched out by the upper blade 120 is positively removed in the void 116. It is pushed out from the inside and discharged smoothly.

  However, when the scrap S is fitted between the opposing side walls 116b, even if the scrap S is pressed by the pressing member 125, the scrap S only rotates and the smooth discharge cannot be obtained. is there. Further, when the lower blade 117 and the upper blade 120 are cut, the intermediate molded product 100 is moved by the pressing force of the pressing member 125 to induce wear of the lower blade 117 and the upper blade 120, and the intermediate molded product 100 is displaced. As a result, there is a concern that the processing accuracy of the molded product 101 is lowered.

  Further, according to Patent Document 1, although raising can be prevented, since protrusions are formed in advance in a portion to be punched prior to punching, productivity is reduced and costs are increased, and scrap is smoothly discharged. May be disturbed.

  Accordingly, the present invention has been made in view of the above points, and a first object thereof is to provide a scrap discharging apparatus for a press die that can stably discharge scrap while ensuring excellent processing accuracy and die life. There is.

  Furthermore, a second object of the present invention is to provide a method for discharging a scrap of a press die that can stably discharge scrap while ensuring excellent processing accuracy and die life.

  The invention of a scrap discharging structure for a press die according to claim 1 that achieves the first object includes a space that continuously opens in a vertical direction from a side portion to a work support surface, and the space and the work. A lower die main body having a lower blade portion extending along an opening edge of a cavity formed by a support surface, and a workpiece that moves down and up to advance and retreat into the cavity and cooperates with the lower blade. In a press die scrap discharging apparatus having an upper blade for cutting scrap from the top, the top portion disposed in the void and receiving and supporting the scrap cut from the workpiece by the upper blade and the lower blade moving downward And bending deformation by pressing the scrap formed on the upper blade facing the top of the bending blade and supported on the top of the bending blade by lowering to the bottom dead center of the upper blade Bending deformation imparting part The scrap is supported in the bending space by being lifted while the upper blade is retracted from the space, and is pushed out of the space and discharged out of the lower die body. Kikka.

  The invention according to claim 2 is the scrap discharging apparatus of the press mold according to claim 1, wherein the bending deformation imparting portion is recessed at the tip of the upper blade and receives the top of the bending blade; And a pressing portion that is formed around the concave portion and is supported by the top of the bending blade so as to press the peripheral edge of the scrap downward to cause bending deformation of the scrap.

  According to a third aspect of the present invention, in the press die scrap discharging apparatus according to the first or second aspect, the bending blade is formed by a pair of bending blade members extending in the vertical direction and facing each other. The kicker is disposed between the bending blade members.

  According to a fourth aspect of the present invention, in the press die scrap discharging apparatus according to any one of the first to third aspects, the kicker gradually descends from the inner side of the die toward the outer side of the die at the upper edge. And a driving unit that moves up and down the kicker unit.

  The invention of the press die scrap discharging method according to claim 5, which achieves the second object described above, includes a space that continuously opens in a vertical direction from a side portion to a work support surface, and the space and the work. A lower die body having a lower blade extending along the opening edge of the cavity formed by the support surface, and a workpiece that moves down and up and moves back and forth in the cavity in cooperation with the lower blade. In a scrap discharging method of a press die having an upper blade that cuts the scrap, the scrap cut from the workpiece by the lower blade and the lower blade is moved by the top of the bending blade disposed in the space. Scrap bending deformation in which the scrap supported by the top portion of the bending blade is bent and deformed by the bending deformation applying portion formed on the upper blade by the lowering operation to the bottom dead center of the upper blade. The scrap supported by the top of the bending blade is pushed out from the void by a lifting step of a kicker disposed in the void so that the upper blade is retracted from the void in a state where the upper blade is retracted from the void. And a scrap discharging step for discharging out of the mold body.

  According to the first aspect of the present invention, the scrap cut from the workpiece by the lowering action of the upper blade is received and supported by the top of the bending blade, and the scrap supported by the top of the bending blade is further lowered by the upper blade. With the operation, the bending deformation imparting portion presses against the scrap supported on the top of the bending blade to bend and deform the scrap. By applying this bending deformation, interference between the scrap and the void is avoided, and the scrap from which the interference with the void is avoided is pushed out of the void by the kicker and discharged, so that the scrap can be moved without interfering with the void. It can be smoothly discharged out of the mold body.

  Therefore, since the interference between the scrap and the void is avoided when the scrap is discharged, the clearance angle formed in the void can be reduced as much as possible, or the clearance angle can be eliminated, and the lower blade is worn or repeatedly polished. The increase in the clearance between the lower blade and the upper blade due to is suppressed, the good clearance between the lower blade and the upper blade is maintained over a long period of time, and the occurrence of burrs and the like is reduced on the cut surface of the workpiece Stable machining accuracy can be obtained. Further, the clearance adjustment work between the lower blade and the upper blade can be reduced, the maintenance can be simplified, and the wear of the lower blade and the upper blade can be suppressed, and the mold life can be extended.

  According to the invention of claim 2, since the bending deformation imparting portion formed on the upper blade has the concave portion for receiving the top portion of the bending blade and the pressing portion formed around the concave portion, it is supported by the top portion of the bending blade. The periphery of the scrap is efficiently pressed by the pressing portion, and the bending deformation of the scrap can be surely applied.

  According to the invention of claim 3, by forming the bending blade with a pair of bending blade members facing each other and disposing the kicker between the bending blade members, the scrap is stabilized at the top ends of the pair of spaced bending blade members. The scrap can be bent and deformed favorably by the bending deformation applying portion. Moreover, the scrap can be smoothly discharged by pushing out the scrap maintained in a stable state with a kicker.

  According to the invention of claim 4, the kicker includes a kicker portion in which a scrap guide portion that gradually descends from the inner side of the die toward the outer side of the die is formed on the upper edge, and a drive unit that moves the kicker portion up and down. Thus, the scrap supported by the bending blade is guided to the scrap guiding part by raising the kicker part by the driving part, and can be smoothly discharged from the void part to the outside of the lower mold body.

  According to the fifth aspect of the present invention, the scrap cut from the workpiece by the descending operation of the upper blade in the scrap supporting process is received and supported by the top of the bending blade, and the bending deformation is imparted by the further descending operation of the upper blade in the bending deformation process. The scrap received by the top of the bending blade is pressed and deformed by bending to avoid interference between the scrap and the void, and the scrap supported by the bending blade by the kicker in the scrap discharging process from inside the void By extruding and discharging, scrap can be smoothly discharged out of the lower mold body without interfering with the void.

  Hereinafter, the embodiment of the scrap discharge structure and scrap discharge method of the press die according to the present invention gradually spreads outward as it descends from the outer periphery 102a of the top surface 102 shown in FIG. From the intermediate molded product 100 which is a bathtub-shaped workpiece having a peripheral surface 103 and having an annular flange surface 104 extending outward from the outer periphery 103a of the peripheral surface 103, as shown in FIG. When a substantially U-shaped or U-shaped cut-out portion 105a extending from the end edge 104a through the flange surface 104 and the peripheral surface 103 to the top surface 102 is cut to obtain a molded product 101 in which the cut-out portion 105 is formed. An example will be described with reference to FIGS.

  FIG. 1 is an explanatory view showing an outline of a trimming press die 1 according to the present embodiment, FIG. 2 is a cross-sectional view taken along line II in FIG. 1, and FIG. 3 is a cross-sectional view taken along line II-II in FIG. .

  The press die 1 includes a lower mold body 10, a pad and an upper blade 20 provided on an upper mold (not shown) that moves downward and upward facing the lower mold body 10, and a scrap discharging device 30.

  The lower mold body 10 includes an upper portion 12 corresponding to the top surface 102 of the intermediate molded product 100, a peripheral surface portion 13 extending outwardly from the outer periphery 12 a of the upper portion 12 corresponding to the peripheral surface 103, and a flange from the outer periphery 13 a of the peripheral surface portion 13. A work support surface 11 having a raised central portion composed of an annular flange surface portion 14 extending outward corresponding to the surface 104 is provided. Further, one end is opened to the side portion 15 of the lower mold body 10, and the side opening portion 16 a that opens to the side portion 15 passes through the flange surface portion 14 and the peripheral surface portion 13 of the work support surface 11 and extends upward and downward. A space 16 serving as a scrap discharge portion that continuously opens in the vertical direction in a U-shape or a U-shape in plan view, having a side wall 16b that extends and a back wall 16c that connects the opposite sides of the side walls 16b. Is formed. It extends continuously in a U shape or a U shape in plan view along the opening edge of the space 16 formed by the corners of the opposite side walls 16b and the back wall 16c of the space 16 and the workpiece support surface 11. The existing lower blade 17 is formed.

  A bending blade 31 and a kicker 35 constituting a scrap discharging device 30 are disposed in a void 16 formed in the lower mold body 10 together with a bending deformation imparting portion 40 formed at the tip of an upper blade 20 described later.

  As shown in FIGS. 1 to 3, the bending blade 31 is formed by a pair of bending blade members 32 that extend in the vertical direction and face each other in parallel with the side wall 16 b of the space 16. As shown in FIG. 2, gaps L <b> 1 and L <b> 2 are formed between the bending blade member 32 and the bending blade member 32.

  As shown in FIGS. 2 and 3, the top 33 of each bending blade member 32 is substantially parallel to the opening end of the space 16 where the lower blade 17 is formed in a side view, in other words, substantially parallel to the edge of the upper portion 12. The upper part 33a extending from the inner side to the outer side, and the outer side of the upper side part 33a is continuous with the outer edge of the upper surface part 33a. An inclined portion 33b that is inclined to be shifted to the portion 16a side, and an outer portion 33c that is continuous with the lower end of the inclined portion 33b and is parallel to the edge of the flange surface portion 14, and includes an upper portion 33a, an inclined portion 33b, and an outer portion. 33c is located slightly below the edges of the upper portion 12, the peripheral surface portion 13, and the flange surface portion 14, respectively. Further, the corner portion of the apex 33 of the bending blade member 32 on the side wall 16b side of the void 16 is subjected to a chamfering process in which the cross-sectional shape is curved or inclined in a tapered shape.

  A kicker 35 is disposed between the opposing bending blade members 32. The kicker 35 has a kicker portion 36 that can move up and down between the opposing bending blade members 32, and a drive portion 38 such as an air cylinder that moves up and down the kicker portion 36, along the upper edge of the substantially triangular plate-like kicker portion 36. From the inside of the mold to the outside of the mold side, that is, from the side opening part 16a, from the upper end 37a in the vicinity of the back wall 16c of the cavity 16 to the lower end 37b in the vicinity of the side opening part 16a opened to the side part 15. A slope-shaped scrap guiding portion 37 that gradually descends is formed.

  As shown in FIGS. 1 to 3, the kicker portion 36 has an upper end 37a of the scrap guiding portion 37 below the upper portion 33a of the top portion 33 of the bending blade member 32, and the scrap guiding portion 37 having an inclined portion 33b and an outer portion 33c. A lower position between the lower position and a raised position where the entire range from the upper end 37a to the lower end 37b of the scrap guide part 37 protrudes upward from the top part 33 of the bending blade member 32 as indicated by a virtual line 36a in FIG. The drive unit 38 moves up and down.

  On the other hand, the tip of the upper blade 20 provided in the upper die has a shape substantially corresponding to the lower blade 17 and a predetermined gap between the upper blade 20 and the lower blade 17 formed on the lower die main body 10 as the upper die descends. It enters the void 16 with a clearance, and retreats from the void 16 by the ascending operation. At the tip of the upper blade 20, when the upper blade 20 is at the bottom dead center position, the top portion 33 of both bending blade members 32 has a clearance larger than the thickness of the scrap S, which will be described later, and can be received. A U-shape or a U-shape in a plan view that can enter between the side wall 16b and the back wall 16c of the space 16 with a gap equal to or greater than the thickness of the scrap S between the top 33 of the bending blade member 32. The bending deformation imparting part 40 provided with the pressing part 42 is formed.

  Next, the operation of the press die 1 provided with the scrap discharging device 30 configured as described above will be described with reference to the flowchart shown in FIG.

  The upper die 20 provided on the upper die at the top dead center position is retracted from the space 16 formed in the lower die body 10 and the pad is separated from the work support surface 11, and the lower die body 10 The top surface 102, the peripheral surface portion 113, and the flange surface 104 of the intermediate molded product 100 are overlapped on the upper portion 12, the peripheral surface portion 13, and the flange surface portion 14 of the above, and the intermediate molded product 100 is fitted and positioned on the work support surface 11 and set ( Work setting step S1).

  The upper mold moves downward while the intermediate molded product 100 is set on the workpiece support surface 11 of the lower mold main body 10, and the intermediate molded product 100 is moved to the workpiece of the lower mold main body 10 by a pad that descends as the upper mold descends. The intermediate molded product 100 is pressed by pressing against the support surface 11, and the intermediate molded product 100 is clamped between the pad and the workpiece support surface 11 (work clamping step S2).

  The cutout portion 105a of the intermediate molded product 100 is punched and cut along the trim line a by the cooperation of the upper blade 20 and the lower blade 17 that are lowered in accordance with the further lowering operation of the upper die. 10 into the empty space 16 to obtain a molded product 101 in which the notch 105 is cut out (scrap cutting step S3).

  The cutout portion 105a punched out by the upper blade 20 is pushed down in the void 16 by the upper blade 20 that further descends as scrap S, and the upper blade 20 corresponds to FIGS. 2 and 3 in the vicinity of the bottom dead center. And as shown in FIG. 6, it receives and is supported by the top part 33 of a pair of each bending blade member 32 which the bending blade 30 opposes (scrap support process S4). The scrap S received by the bending blade 31 is bent into a shape substantially corresponding to the bent shape of the scrap S, and the top portions 33 of the pair of bending blade members 32, that is, the upper portion 33a, the inclined portion 33b, It is supported in a stable state fitted to the outer portion 33c.

  Further, the upper blade 20 enters the void 16 as the lower die is moved down to the upper dead center position. As shown in FIG. 8, the pressing portion 42 of the bending deformation imparting portion 40 formed at the tip of the upper blade 20 by the lowering operation of the upper blade 20 is supported by the top portion 33 of the both bending blade members 32 and the peripheral portion of the scrap S. By pressing Sa, bending deformation is applied downward to the peripheral edge Sa of the scrap S (scrap bending deformation applying step S5).

  In the bending deformation of the scrap S accompanying the lowering operation of the upper blade 20, the peripheral portion Sa is easily and smoothly bent and deformed by the pressing by the pressing portion 42 by the chamfering process of the corner portion of the top portion 33 of the bending blade member 32. Since the top portion 33 of the bending blade member 32 is received between the concave portion 41 with a gap larger than the thickness of the scrap S, the curved portion is deformed in the concave portion 41 as well, so that the horizontal direction of the scrap S, that is, both side walls 16b. The dimension in the opposite direction is reduced, and a gap is formed between the end portion Sa and the side wall 16b of the space 16, and contact between the side wall 16b and the scrap S is avoided or interference due to contact is suppressed.

  Thereafter, the upper mold is raised from the bottom dead center position to the top dead center position. The upper blade 20 is moved upward from the space 16 and retracted by the upward movement of the upper die, and the pad is lifted to release the clamp of the molded product 101 and the molded product 101 is carried out (work unloading step S6). ).

  In a state where the molded product 101 is unloaded and the upper blade 20 is retracted from the space 16 of the lower die body 10, the kicker unit 36 is lifted from the lowered position indicated by a virtual line 36a in FIG. Raise to position. The scrap S supported by the top portions 33 of the bending blade members 32 is pushed up by the rise of the kicker portion 36 to leave the top portion 33 and gradually descend downward from the inside of the mold toward the outside of the side portion. It is guided to the guide part 37 and discharged from the side opening part 16a of the void 16 to the outside of the side part of the lower mold body 10 (scrap discharge process S7).

  The scrap S is discharged in advance in a bending bending deformation applying step S5, in which bending deformation is applied to the scrap S to form a gap between the peripheral edge Sa and the side wall 16b of the cavity 16, and the side wall 16b and the scrap S are separated. Since the contact is avoided or the contact is suppressed, it is lifted in a stable state by the kicker portion 36 that does not fit between the opposing side walls 16b of the space 16 and moves upward between the opposing bending blade members 32. Thus, it can be smoothly guided by the scrap guide part 37 of the kicker part 36 and discharged from the side opening part 16a of the void 16 to the outside.

  After the scrap S is discharged, the kicker 36 is lowered from the raised position to the lowered position by the drive unit 38 of the kicker 35 (kicker lowering step S8).

  A kicker lowering step of lowering the kicker portion 36 of the scrap discharging device 30 from the raised position to the lowered position after the scrap S is discharged from the work setting step S1 of setting the intermediate molded product 100 on the workpiece support surface 11 of the lower die main body 10. By repeating S8, the press work operation for obtaining the molded product 101 in which the cutout portion 105a is cut and formed sequentially by cutting and removing the cutout portion 105a from the intermediate molded product 100 is continuously repeated.

  Therefore, according to the present embodiment, the scrap S cut from the intermediate molded product 101 by the lowering operation of the upper blade 20 is received and supported by the top portions 33 of the pair of bending blade members 32 and further lowered. The scraper is pressed by the bending deformation imparting portion 40 formed on the upper blade 20 to be bent and deformed, and the scraper is scraped by the kicker 35 in a state where interference with the side wall 16b of the cavity 16 of the lower mold body 10 is avoided. By extruding S from the void 16 and discharging it, the scrap S can be smoothly discharged out of the lower mold body 10 without interfering with the side wall 16 a of the void 16.

  This avoids interference with the side wall 16b of the space 16 when discharging the scrap S, so that the clearance angle of the side wall 16b at the opening edge of the space 16 where the lower blade 17 is formed is minimized or escaped. It becomes possible to eliminate the corners, and the increase in the clearance between the lower blade 17 and the upper blade 20 due to the wear of the lower blade 17 due to use and repeated polishing is suppressed, and any of the generated on the cut surface of the notch 105 Stable machining accuracy can be obtained by reducing burr and burrs. In addition, the frequency of adjusting the clearance between the lower blade 17 and the upper blade 20 can be reduced, so that the maintenance can be simplified, and the wear of the lower blade 17 and the upper blade 20 is suppressed, so that the mold life can be extended. . Furthermore, when the lower blade 17 and the upper blade 20 are cut, the movement of the intermediate molded part 100 is prevented, and a decrease in processing accuracy due to the deviation of the intermediate molded product 100 can be suppressed.

  Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention. For example, in the above-described embodiment, the bathtub shape has the peripheral surface 103 that gradually spreads outward from the outer periphery 102a of the top surface 102, and the annular flange surface 104 that extends outward from the outer periphery 103a of the peripheral surface 103 is formed. The intermediate molded product 100 has been described by taking as an example a case where the molded product 101 in which the notched portion 105a is formed by cutting the notched portion 105a extending from the flange surface 104 through the peripheral surface 103 to the top surface 102 is formed. The present invention can also be applied to a scrap discharging structure and a discharging method when pressing a molded product in which a notch portion is formed by cutting a notched portion extending from an outer peripheral edge of an intermediate molded product having another shape such as a flat plate shape. In the above embodiment, the case where the cut-out portion 105 having a substantially U-shape or U-shape in plan view is cut and formed has been described as an example. It can also be applied to the discharge method.

It is explanatory drawing which shows the outline | summary of the press metal mold | die which concerns on embodiment of this invention. It is the II sectional view taken on the line of FIG. It is the II-II sectional view taken on the line of FIG. It is a flowchart which shows the action | operation of the press metal mold | die provided with the scrap discharge apparatus in this Embodiment. It is an operation explanatory view. It is an operation explanatory view. It is an operation explanatory view. It is an operation explanatory view. It is a perspective view of a molded product. It is a perspective view of an intermediate molded product. It is outline | summary explanatory drawing of the conventional press die. It is the III-III sectional view taken on the line of FIG. It is explanatory drawing of the conventional scrap discharge structure. It is explanatory drawing of the conventional scrap discharge structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Press die 10 Lower mold | type main body 11 Work support surface 12 Upper part 13 Peripheral surface part 14 Flange surface part 15 Side part 16 Space 16a Side part open part 16b Side wall 16c Back wall 17 Lower blade 20 Upper blade 30 Scrap discharge device 31 Bending blade 32 Bending blade member 33 Top portion 35 Kicker 36 Kicker portion 37 Scrap guiding portion 37a Upper end 37b Lower end 38 Drive portion 40 Bending deformation imparting portion 41 Recess 42 Pressing portion 100 Intermediate molded product (workpiece)
101 Molded product (work)
102 Top surface 103 Peripheral surface 104 Flange surface 105 Notch part 105a Notch part a Trim line S Scrap Sa Peripheral part S1 Work setting process.
S2 Work clamping process S3 Scrap cutting process S4 Scrap support process S5 Scrap bending deformation applying process S6 Work carrying out process S7 Scrap discharging process S8 Kicker lowering process

Claims (5)

A lower mold having a space that continuously opens in the vertical direction from the side portion to the workpiece support surface and a lower blade that extends along an opening edge of the space formed by the space and the workpiece support surface In a scrap discharging apparatus of a press die comprising a main body, and an upper blade that descends and rises and moves back and forth in the space and cuts scrap from a workpiece in cooperation with the lower blade,
A bending blade having a top portion for receiving and supporting the scrap cut from the workpiece by the upper blade and the lower blade, which are disposed in the void and moved downward;
A bending deformation imparting portion that is formed on the upper blade facing the top of the bending blade and that bends and deforms by pressing the scrap supported on the top of the bending blade by a lowering operation to the bottom dead center of the upper blade; ,
A kicker that is disposed in the void so as to be movable up and down, and that pushes out the scrap supported by the bending blade by the ascending operation while the upper blade is retracted from the void, and discharges the scrap to the outside of the lower mold body. And a scrap discharging device for a press die.   The bending deformation imparting portion is recessed at the tip of the upper blade to receive the top of the bending blade, and the scrap is formed around the recess and supported by the top of the bending blade. The scrap discharging apparatus of a press die according to claim 1, further comprising a pressing portion that presses the scrap and applies bending deformation to the scrap.   3. The bending blade according to claim 1, wherein the bending blade is formed of a pair of opposing bending blade members extending in the vertical direction, and the kicker is disposed between the opposing bending blade members. Press die scrap discharge device.   The kicker includes a kicker portion having a scrap guide portion that gradually descends from the inside of the mold toward the outside of the mold side at the upper edge, and a drive portion that moves the kicker up and down. The scrap discharge device of the press die according to any one of claims 1 to 3. A lower mold having a space that continuously opens in the vertical direction from the side portion to the workpiece support surface and a lower blade that extends along an opening edge of the space formed by the space and the workpiece support surface In a scrap discharging method of a press die comprising a main body, and an upper blade that moves down and up and moves back and forth in the space and cooperates with the lower blade to cut a workpiece,
A scrap support step of receiving and supporting the scrap cut from the workpiece by the upper blade and the lower blade moving downward by the top of the bending blade disposed in the void;
A scrap bending deformation applying step in which the scrap supported by the top of the bending blade is bent and deformed by a bending deformation applying portion formed on the upper blade by a lowering operation to the bottom dead center of the upper blade;
The scrap supported by the top of the bending blade is pushed out of the cavity by the ascending operation of the kicker disposed so as to be movable up and down in the cavity with the upper blade retracted from the cavity to the outside of the lower die body. A scrap discharging method for a press die, comprising: a scrap discharging step for discharging.

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