JP2008279454A - Trimming press die - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the damage of a workpiece by eliminating the adhesion of chips to a punch face. <P>SOLUTION: When trimming a non-product part region S from a product part region D by the shearing action of a punch 5 of a lower die 1 with the sectional die 10 of an upper die, simultaneously the non-product part region S is subdivided into a plurality of small scrap pieces Sm by the shearing action of a lower scrap cutter 6 attached to the lower die 1 with an upper scrap cutter 11 attached to the upper die 2. By providing a gap G between the punch 5 and the lower scrap cutter 6 and also a magnet 12 on the tip face 6b of the lower scrap cutter 6, the chips M generated during trimming are attracted while the chips are dropped through the gap G. Further, the workpiece W which is an object to be trimmed is attracted and held with other magnets 13. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a trimming press die provided with a scrap cutter, for example, when cutting and removing a non-product part region attached to a frame shape around the product part region of a panel-like work after drawing as scrap. At the same time, the present invention relates to a trimming press die in which the scrap is divided into a plurality of short scrap pieces in order to increase scrap recovery efficiency.

As this type of trimming press die, in particular, a dust removing device for a press die intended to remove unnecessary materials such as chips generated during trimming, a device described in Patent Document 1 has been proposed. In the technique described in Patent Document 1, a predetermined gap is provided in the vicinity of the cutting edge of the punch-side cutting blade functioning as the lower die and facing the bottom dead center position of the upper die-side cutting blade. A magnet is provided so that, for example, chips generated during trimming are adsorbed by the magnet.
Japanese Patent Laid-Open No. 8-117882

  In the above-described conventional technique, the portion near the cutting edge of the punch side cutting blade and facing the bottom dead center position of the upper die cutting blade is the outer peripheral surface of the punch itself and the cutting edge of the punch. Since the magnet is provided directly below, the magnetic force reaches the punch face that functions as a workpiece receiving surface. For this reason, chips are actively adsorbed on the punch face which is important in terms of function, and the work placed on the punch face is undesirably generated at the time of press processing after the next cycle. .

  Further, in the above prior art, in order to cut the cut scrap into a plurality of scrap pieces, the scrap cutter is formed in such a manner that the upper and lower molds intersect with the respective cutting blades (the scrap cutter itself is, for example, Japanese Patent Publication No. 61-50058). When well-known in the official gazette, etc., the chips generated during trimming or scrap cutting stay on the lower scrap cutter. As a result, the chips are more likely to adhere to the punch face.

  The present invention has been made paying attention to such a problem, and effectively eliminates the secondary problems of the above-described conventional technology, and in particular, the cutting chips on the punch face functioning as a lower mold. The present invention provides a trimming press die that can prevent adhesion of the workpiece and prevent the workpiece from being damaged.

  According to the first aspect of the present invention, the trimmed cutting blades on the upper die and the lower die are used as the frame-shaped non-product portion region around the product portion region in the center portion of the panel-like work. Trimming as scrap by shearing each other, and upper scrap cutter provided on the upper mold side so that the scrap cutting edge intersects the trim cutting edge on the upper mold side, and trimming on the lower mold side as well It is premised on a trimming press die in which the scrap is cut into a plurality of scrap strips by a shearing action with a lower scrap cutter provided on the lower die side so as to intersect the cutting blade.

  In addition, the lower scrap cutter is separated from the lower die trimming blade by a predetermined distance so that the upper die trimming blade can be received between the lower die trimming blade and the lower scrap cutter. A gap is formed between the two, and a magnet is provided on the tip surface of the lower scrap cutter that faces the lower die at least with the gap.

  Therefore, in the present invention, since the magnet is provided not on the lower mold side but on the lower scrap cutter side separated from the lower mold by a predetermined distance, the magnetic force of the magnet does not reach the lower mold, so No chips adhere to the workpiece receiving surface.

  In addition, since a predetermined gap is secured between the lower mold and the lower scrap cutter, even if the chips generated by the trimming are not adsorbed by the magnet, the chips are removed between the lower mold and the lower scrap cutter. It is possible to positively discharge through the gap of the metal, and it is possible to prevent chips from adhering to the work receiving surface of the lower mold.

  According to the first aspect of the present invention, there is an effect that it is possible to prevent the chip from being attached to the lower mold work receiving surface and prevent the work from being damaged.

  1 and the following drawings show a preferred embodiment of the present invention. In particular, FIG. 1 shows an example of a panel-like workpiece to be trimmed, and FIG. 2 shows a scrap cutter as a trimming press mold for performing the trimming. 6 shows a schematic of a mold structure with 6 and 11.

  As shown in FIG. 1, a panel-shaped workpiece W drawn in the form of, for example, a door outer panel of an automobile with a substantially rectangular blank material in a previous process, has a non-product part region around the product part region D. Since S is attached in a frame shape, in the trimming process following the drawing process, the non-product part area S is separated from the product part area D as scrap by the trim line TL, and at the same time, the frame-like non-product part area S is separated. Is cut from the scrap cut line SL to divide the non-product portion region S, which is a substantially frame-shaped scrap, into a plurality of scrap strips Sm.

  The trimming press die shown in FIG. 2 is composed of a lower die 1 and an upper die 2 which are arranged opposite to each other as is well known, and the upper die 2 moves up and down with respect to the lower die 1 while being guided by the guide posts 3. It will be.

  The lower die 1 is obtained by fixing a punch 5 having a trimming cutting edge 5a as shown in FIG. 3 on a lower holder 4, and around the punch 5 at a position corresponding to the scrap cut line SL of FIG. The lower scrap cutters 6 are respectively arranged, and each lower scrap cutter 6 is fixed to the lower holder 4. As shown in FIG. 3, the lower scrap cutter 6 has a scrap cutting edge 6a that intersects with the trimming cutting edge 5a on the punch 5 side.

  On the other hand, the upper die 2 has an upper holder 7 that elastically supports a pad 9 so as to be movable up and down via an elastic body 8 such as urethane or a coil spring, and a trimming cutting blade around the pad 9 as shown in FIG. A substantially frame-shaped sectional die 10 having 10 a is arranged, and the sectional die 10 is fixedly arranged on the upper holder 7. Further, each of the sectional dies 10 is provided with an upper scrap cutter 11 at a position corresponding to the scrap cut line SL of FIG. 1, and the upper scrap cutter 11 can individually mesh with the lower scrap cutter 6 described above. Yes. As shown in FIG. 4, the upper scrap cutter 11 has a scrap cutting edge 11 a that intersects with the trimming cutting edge 10 a on the side of the sectional die 10, as in the case of the lower scrap cutter 6.

  The behavior of the trimming press die configured in this way is basically the same as that of the conventional one, and the upper die 2 of FIG. With the upper surface of the lower scrap cutter 6 as a workpiece receiving surface, a panel-shaped workpiece W as shown in FIG.

  When the upper die 2 is lowered, first, the pad 9 presses and restrains the panel-shaped workpiece W between the punch 5 and the punch face, and thereafter, the sectional die 10 other than the pad 9 is further lowered, and the punch 5 The non-product part region S of the panel-like workpiece W is scraped from the product part region D as a scrap by the shearing action based on the engagement between the side trimming cutting blade 5a and the sectional die 10 side trimming cutting blade 10a. Cut off.

  At the same time, the lower scrap cutter 6 and the upper scrap cutter 11 are engaged with each other, so that the non-product has the scrap cut line SL of FIG. The partial area S is subdivided into a plurality of slap strips Sm.

  Here, FIG. 5 in addition to FIG. 4 shows details of the lower scrap cutter 11 that controls the division from the non-product part region S to the plurality of scrap strips Sm as described above.

  As shown in the figure, each lower scrap cutter 6 is fixed on the lower holder 4 with a predetermined distance from the outer peripheral surface 5b of the punch 5, and the outer scrap surface 6b facing the outer peripheral surface 5b of the punch 5 and the punch 5 A gap of G is positively set between the front end surface 6b. When the upper die 2 reaches the bottom dead center position, the vicinity of the trimming cutting edge 10a, which is the lower end on the sectional die 10 side, is set to be received in the gap G.

  A magnet (permanent magnet) 12 is flush with the tip surface 6b of the lower scrap cutter 6 that faces the outer peripheral surface 5b of the punch 5 across the gap G so as to be exposed to the tip surface 6b. It is buried like this. The position of the magnet 12 is set so as not to interfere with the trimming cutting edge 10a even if the vicinity of the trimming cutting edge 10a of the sectional die 10 reaches the bottom dead center position.

  Further, the upper surface of the lower scrap cutter 6 that extends along the longitudinal direction of the scrap cutting edge 6a of the lower scrap cutter 6 and functions as a workpiece receiving surface when the workpiece is positioned and placed earlier, and the scrap A plurality of magnets 13 are embedded in the vicinity of the cutting edge 6 a so as to be exposed to the outside in the same manner as the magnets 12.

  In addition, the magnets 12 and 13 are fixed by a method of fastening with bolts 14 as shown in FIG. 6A in addition to a method of fixing the magnets 12 and 13 to the mounting holes with an adhesive as shown in FIG. Further, as shown in FIG. 5B, the magnet 12 on the front end surface 6b of the lower scrap cutter 6 may protrude from the front end surface 6b as long as it does not interfere with the upper scrap cutter 11.

  Therefore, according to this embodiment, as shown in FIGS. 4 and 5 in addition to FIG. 1, the shearing is based on the engagement between the trimming cutting edge 5 a on the punch 5 side and the trimming cutting edge 11 a on the sectional die 1 side. As a result, the non-product part region S is trimmed from the product part region D with the trim line TL, and the non-product part region S is not sheared by the shearing action based on the engagement between the scrap cutting edge 6a of the lower scrap cutter 6 and the scrap cutting edge 11a of the upper scrap cutter 11. The product part area S is cut from the scrap cut line SL into a plurality of scrap strips Sm.

  Further, when the panel-like workpiece W is positioned and placed on the lower mold 1 prior to the trimming process, the non-product portion region S at the peripheral portion of the workpiece W is seated on the lower scrap cutter 6. The magnet 13 attached to the upper surface of the lower scrap cutter 6 attracts and supports the non-product part region S of the peripheral part of the work W, so that the positioning accuracy of the work W is stabilized and the accuracy variation of the product part region D can be reduced. become.

  When the sectional die 10 reaches the bottom dead center, as shown in FIG. 4, the vicinity of the trimming cutting edge 10a, which is the lower end of the sectional die 10, is positioned on the outer peripheral surface 5b of the punch 5 and the tip surface 6b of the lower scrap cutter 6. In addition, the gap G is secured between the outer peripheral surface 5b of the punch 5 and the front end surface 6b of the lower scrap cutter 6 in actuality. The scrap cut line SL is discontinuous with respect to the trim line TL. However, because of the rigidity of the workpiece W itself, the scrap strips Sm and Sm are surely cut and separated even in the relevant part by so-called tearing fracture. Become.

  In this case, the chip M is generated by the shearing action of the trimming cutting blade 5a on the punch 5 side and the trimming cutting blade 10a on the sectional die 10 side, but the chip M falls downward from the gap G. In addition, some are attracted to the magnet 12 on the front end surface 6 b of the lower scrap cutter 6. Similarly, the chips generated by the shearing action between the scrap cutting edge 6a of the lower scrap cutter 6 and the scrap cutting edge 11a of the upper scrap cutter 11 fall downward.

  As described above, the chips M generated by the trimming are positively dropped downward, and a part thereof is attracted by the magnet 12 provided on the lower scrap cutter 6 side. It is possible to prevent the chips M from being scattered by the wind pressure associated with the lifting and lowering operation, and to prevent the occurrence of problems such as the pressing of the workpiece W due to the attachment of the chips M to the punch face of the punch 5.

  In addition, the scrap strip Sm cut from the scrap cut line SL is adjacent to the non-product portion region S to be trimmed from the product portion region D in combination with the attractive force by the magnet 12 acting. Although it may get stuck between the lower scrap cutters 6 and 6, for example, a conventionally known spring plunger type kicker is provided on the upper die 2 side, and the scrap strip Sm is forcibly removed by this kicker. By doing so, the scrap strip Sm can be reliably discharged from between the adjacent lower scrap cutters 6 and 6.

  Of course, it is possible to use electromagnets as the magnets 12 and 13, but it is desirable to use permanent magnets as described above in terms of cost and ease of handling.

Explanatory drawing which shows an example of the workpiece | work used as the process target with the trimming press type | mold which concerns on this invention. Cross-sectional explanatory drawing which shows the whole structure of the trimming press type | mold which concerns on this invention. The principal part perspective view which shows the relative positional relationship of the punch as a lower mold | type component corresponding to the A section of FIG. 1, and a lower scrap cutter. The principal part expansion explanatory drawing of FIG. 4 including the structure of FIG. It is a figure which shows the detail of the lower scrap cutter in FIG. 4, (A) is the side view, (B) is the front view which looked at the figure (A) from the left side, (C) is a top view of the figure (B) . (A), (B) is principal part explanatory drawing which shows the modification of the magnet attachment structure in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Lower die 2 ... Upper die 5 ... Punch 5a ... Trimming cutting blade 5b ... Outer peripheral surface 6 ... Lower scrap cutter 6a ... Scrap cutting blade 6b ... Tip surface 9 ... Pad 10 ... Sectional die 10a ... Trimming cutting blade 11 ... Upper scrap Cutter 11a ... Scrap cutting edge 12 ... Magnet 13 ... Magnet D ... Product part area G ... Gap M ... Chip S ... Non-product part area (scrap)
Sm ... Scrap scrap W ... Panel work

Claims (2)

Trimming the frame-shaped non-product part area around the upper part and the lower part of the trimming cutting blades on the upper mold side and the lower mold side as a scrap by a shearing action while leaving the product part area at the center of the panel-like work,
The upper scrap cutter provided on the upper die side so that the scrap cutting blade intersects the trimming blade on the upper die side, and the lower die side so that the scrap cutting blade also intersects the trimming cutting blade on the lower die side In the trimming press die that cuts the scrap into a plurality of scrap strips by the shearing action with the lower scrap cutter provided in
The lower scrap cutter is disposed at a predetermined distance from the lower die trimming blade so that the upper die trimming blade can be received between the lower die trimming blade and the lower scrap cutter. And forming a gap between the two,
A trimming press die characterized in that a magnet is provided on a front end surface of the lower scrap cutter that faces the lower die at least with the gap therebetween.   2. The trimming according to claim 1, wherein, in addition to providing a magnet on the front end surface of the lower scrap cutter, a magnet is provided on a workpiece receiving surface along the longitudinal direction of the scrap cutting edge in the lower scrap cutter. Press mold.

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