JP2017060980A - Method and die for trimming workpiece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and die for trimming a workpiece having irregularities, which can stabilize the shape of cut and trimmed portions when trimming the workpiece having irregularities, and which can save the cost of the die.SOLUTION: A workpiece W having irregularities is placed on a punch 10, and a pad 30 is relatively moved toward the punch 10, thus the pad 30 and the punch 10 squash some of the multiple irregularities of the workpiece W, forming a squashed portion q1. At the same time, the workpiece is divided by the squashed portion q1 into an unsquashed portion r where the irregularities are kept, and a portion p to be cut. Subsequently, a die 20 having a straight trim blade 22 is relatively moved toward the punch 10, thus the portion p to be cut is cut off the squashed portion q1 by a straight trim blade 14 provided at an outer edge of the punch 10, and the trim blade 22 of the die 20.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a workpiece trimming method and a trim mold.

  Conventionally, techniques for trimming a workpiece with a press die are known as shown in Patent Document 1, Patent Document 2, and the like. For example, in Patent Document 1, when a workpiece is placed on a lower die, the workpiece is pressed with a pad from above and the upper die is lowered, the trim blade provided on the upper die is used to cut the edge of the workpiece. ing.

Japanese Patent Laid-Open No. 2011-36873, FIG. JP-A-62-2433

  By the way, when trimming with the trim line L with respect to the workpiece | work W which has uneven | corrugated shape as shown to Fig.11 (a), in order to suppress a die cost, it cut | disconnected with the trim line that the said trim blade is a straight blade. The end face of the portion and the shape in the vicinity thereof are crushed by the course as shown in FIG. FIG. 11B is a cross section of the workpiece W when it is not crushed by trimming, and the thickness of the concavo-convex shape is a. FIG. 11C shows a cross-section of the workpiece W when the uneven workpiece W is crushed, and the thickness of the uneven shape is b. In this case, the thickness a> b, and an unstable shape in which the thickness of the cut surface of the uneven workpiece W formed by trim processing is not constant.

  In addition, when the trim blade Ta is a straight blade as shown in FIG. 11D, when trying to cut the concavo-convex workpiece W, even if a part of the straight blade is in a cutting state, Other parts are so-called aerial cuts, and the sliding distance of the trim blade Ta in the thickness direction of the workpiece W increases, which promotes wear. In FIG.11 (d), the space area K is an area | region used as air cut. In FIG. 11D, Tb represents a lower trim blade.

On the other hand, as shown in FIG. 11 (e), if the trim blade (cutting blade) is formed in accordance with the concavo-convex shape of the workpiece W, there is a problem that the manufacturing cost of the mold increases.
An object of the present invention is to provide a trim method and a trim mold for a workpiece having a concavo-convex shape that can stabilize the cut surface shape of the trimmed cutting portion and suppress the die cost when trimming a workpiece having a concavo-convex shape portion. It is to provide.

  In order to solve the above problems, the workpiece trimming method according to the present invention includes a first step of placing a workpiece having a plurality of concave and convex portions on a lower mold, and a relative movement of a pad to the lower mold side. The relatively moved pad and the lower mold form a crushed portion by crushing a portion of the concavo-convex shape portion of the workpiece among the plurality of concavo-convex shape portions, and the remaining crushed portion in between. A second step of partitioning and forming a non-crushing portion where the concavo-convex shape portion is held and a portion to be cut, and a relative movement of the upper die having a trim blade that is a straight blade toward the lower die, A third step of cutting the planned cutting site from the crushed site by a trim blade, which is a straight blade provided at an outer edge, and the trim blade of the upper mold.

  Further, the lower mold has a pressing portion that forms the crushing portion in cooperation with the pad, and a storage recess adjacent to the pressing portion, and the lower mold side surface of the pad has a flat surface. And in the said 2nd process, the said workpiece | work may be pressed by the said plane of the said pad, and you may make it move the said non-crushing site | part in the said storage recessed part.

  Further, the pad has a pressing portion that forms the crushing portion of the workpiece in cooperation with the lower mold, and a storage recess adjacent to the pressing portion. In the second step, The non-collapsed part may be moved by being pressed into the storage recess.

  The lower mold and the pad each have a first pressing part and a second pressing part that cooperate to form the crushing part of the workpiece, and the lower mold and the pad have the first pressing part and the pad, respectively. A first storage recess adjacent to the first pressing portion and a second storage recess adjacent to the second pressing portion, and in the second step, the non-crushing portion is pressed by the pad and the lower mold, You may make it accommodate in both the said 1st accommodation recessed part and a 2nd accommodation recessed part.

In the second step, the crushing portions may be formed at at least both ends of the workpiece.
The trim mold of the present invention is a trim mold for trimming a workpiece having a plurality of concave and convex portions, and has a trim blade that is a straight blade on an outer edge portion, and a lower mold on which the workpiece is placed, It is a pad that is disposed relatively close to and away from the lower mold, moves relatively to the lower mold side, presses the workpiece placed on the lower mold, and against the workpiece Forming a crushing site by crushing the concavo-convex shape part at the edge, and partitioning the non-crushing part and the planned cutting site where the remaining concavo-convex part is held with the crushing part in between, An upper die having a trim blade of a straight blade that cuts the planned cutting portion from the crushing portion in cooperation with the trim blade of the lower die when relatively moved to the lower die side, the pad and the At least one of the lower molds In forming the serial crushing site, and has a storage recess for accommodating the non-crushed portion.

  According to the construction method and the trim mold of the present invention, when a workpiece having a concavo-convex shape portion is trimmed, the cut surface shape of the trimmed cut portion can be stabilized and the die cost can be suppressed.

The perspective view of the workpiece | work in which trim processing is performed. The schematic diagram of the state which mounted the work on the punch in the trim metallic mold of a 1st embodiment. In the trim mold of a 1st embodiment, a schematic diagram of the state where a pad was lowered and a crushing part was formed in a work. In the trim mold of a 1st embodiment, the die is lowered and the schematic diagram of the state where the section to cut was cut. The schematic diagram of the state where the pad and die were raised in the trim metallic mold of a 1st embodiment. (A) is a principal part enlarged view of the state which mounted the workpiece | work on the punch, (b) is a principal part enlarged view of the state which formed the crushing site | part in the workpiece | work. (A) is a side view of the workpiece after trimming, (b) is a sectional view taken along line 7b-7b in FIG. 7 (a), and (c) is a sectional view taken along line 7c-7c in FIG. 7 (a). (A) is a top view of the workpiece | work in which the non-crushing site | part was provided in both ends, (b) is a top view of the workpiece | work in which the non-crushing site | part was provided in the four side edge. (A) is explanatory drawing of the 1st process of 2nd Embodiment, (b) is explanatory drawing of a 2nd process, (c) is FIG.7 (b) equivalent figure of 2nd Embodiment. (A) is explanatory drawing of the 1st process of 3rd Embodiment, (b) is explanatory drawing of a 2nd process, (c) is FIG.7 (b) equivalent figure of 3rd Embodiment. (A) is explanatory drawing which shows the trim line L of a workpiece | work, (b) is sectional drawing of the workpiece | work W when not crushed by trim processing, (c) is sectional drawing of the workpiece | work W when crushed by trim processing, (D) is explanatory drawing at the time of trimming a workpiece | work with a linear blade, (e) is explanatory drawing at the time of trimming a workpiece | work with the trim blade (cutting blade) made according to the uneven | corrugated shape.

Hereinafter, an embodiment of a work trimming method and a trim mold embodying the present invention will be described with reference to FIGS.
The workpiece W of the present embodiment is a metal separator that serves as an electrode of a fuel cell, and is formed in a rectangular shape when viewed as a whole. As shown in FIG. 1, the work W is formed in a corrugated shape as a whole by alternately and repeatedly arranging concave portions Wa as concave and convex portions and convex portions Wb as concave and convex portions in one direction. ing. In the present embodiment, the concavo-convex shape portion has a plurality of parts by being repeatedly formed as described above. In addition, the uneven | corrugated shaped part is not limited to the said structure, What is necessary is just to have an uneven | corrugated shape in the front and back of the workpiece | work W.

Next, the trim mold will be described.
As shown in FIG. 2, the trim mold has a punch 10 as a lower mold, a pair of dies 20 and a pad 30 as an upper mold.

  The punch 10 is fixed on the bolster 12. The upper end surface of the punch 10 is formed in a rectangular shape, and a storage recess 15 is formed with the left and right pressing portions 13 remaining in FIG. The storage recess 15 has a rectangular shape in plan view, and the depth thereof is between the top surface of the uneven portion shape of the workpiece W (that is, the top surface of the protrusion Wb) and the lower surface of the recess Wa. It has a depth that exceeds the distance h (see FIG. 1), and can accommodate a region of the workpiece W that will be a non-crushing portion described later during trimming.

The left and right pressing portions 13 have a flat upper surface, and trim blades 14 that are straight blades are formed to extend in a direction perpendicular to the paper surface on the outer edge of the upper surface on the side opposite to the storage side. .
The pair of dies 20 are respectively fixed to the slide 40 of the press machine at a position sandwiching a pad 30 described later. At the lower end surface of the die 20, trim blades 22, which are straight blades, are formed on the inner edge so as to extend in a direction orthogonal to the paper surface. The trim blade 22 can trim the workpiece W placed on the punch 10 in cooperation with the trim blade 14 of the punch 10.

  As shown in FIG. 2, the pad 30 is disposed between the pair of dies 20 and is supported by being suspended from the slide 40 via an elastic support portion 50 such as a spring. The pad 30 is arranged so as to protrude downward from the die 20 when the mold is opened by the elastic support portion 50, and at the bottom of the die 20 against the elasticity of the elastic support portion 50 as shown in FIG. It can arrange | position so that it may be located above.

  Further, the pad 30 is arranged so as to be included in a virtual vertical plane (not shown) in which the left end face in FIG. 2 is arranged to include the left end face of the punch 10. In addition, the pad 30 is arranged so as to be included in a virtual vertical plane (not shown) whose right end face is arranged so as to include the right end face of the punch 10 in FIG. The left and right end faces of the pad 30 are slidably disposed with respect to the opposing side end faces of the dies 20.

Further, the lower end surface of the pad 30 (that is, the surface on the punch 10 side) is formed into a flat surface. The lower end surface is disposed in parallel with the upper surface of the pressing portion 13.
(Work trimming method)
Next, a work trimming method will be described.

  As shown in FIGS. 2 and 6A, the workpiece W is placed on the left and right pressing portions 13 of the punch 10 in a state where the trim mold is opened as the first step. In the present embodiment, the workpiece W is placed on the punch 10 so that the direction in which the concave portions Wa and the convex portions Wb are alternately and repeatedly arranged coincides with the direction orthogonal to the paper surface. In this state, as shown in FIG. 2, the left and right ends of the workpiece W are disposed so as to protrude from the left and right end faces of the punch 10 in the left-right direction. As shown in FIG. 1 and FIG. 2, in the work W, the portions that protrude in the left-right direction from the left and right end faces from the punch 10 correspond to the planned cutting portion p. Moreover, in the workpiece | work W shown in FIG. 1, the site | part which is contact | abutting to the press part 13 is the site | part q which will become a crushing site | part.

  As shown in FIG. 3, in the next second step, the slide 40 is moved relative to the punch side (that is, lowered), and the pad 30 is pressed against the work W. By the pressing by the pad 30, the part q of the work W between the pad 30 and the pressing part 13 of the punch 10 is crushed into a crushing part q1. The concavo-convex shape portion in this part q is crushed by the pad 30 and the pressing part 13 (punch 10) pressed as described above.

  As shown in FIG. 3, when the crushing portion is formed, the portion between the crushing portions q <b> 1 of the work W is pressed by the pad 30, so that a part of the concavo-convex shape portion is deformed and the storage concave portion 15. Stored inside. And the accommodated site | part becomes the non-crushing site | part r with which the shape of the uneven | corrugated shaped part was hold | maintained.

By forming the crushing part q1 in this way, the non-crushing part r in which the concavo-convex shape portion is held with the crushing part q1 in between and the planned cutting part p are partitioned.
Next, as shown in FIG. 4, in the third step, the slide 40 is further moved relative to the punch side (that is, lowered), and the trim blade 22 of the die 20 and the trim blade 14 of the punch 10 are used. The planned cutting site p of the workpiece W is trimmed (cut) from the crushing site q1. FIG. 6B shows a state after a crushing site is formed on the workpiece and the planned cutting site p is cut.

Thereafter, as shown in FIG. 5, the die 20 and the pad 30 are raised and the mold is opened by moving the slide 40 relative to the anti-punch side (that is, raising).
In this way, the workpiece W is trimmed (cut) between the crushing site q1 and the planned cutting site p, so that the cut surface shape of the crushing site q1 that becomes the cutting site does not change at all, that is, is stabilized. it can. As a result, the trim blades (cutting blades) 14 and 22 are straight blades, and the sliding distance of the trim blades 14 and 22 with respect to the workpiece W when cutting can be shortened, so that wear of the trim blades can be suppressed. .

Further, it is not necessary to make the trim blades 14 and 22 in accordance with the uneven shape of the workpiece W, and the production cost of the mold does not increase.
Further, the workpiece W taken out from the trim mold is as shown in FIGS. 7A, 7B, 7C, and 8A, and is crushed as shown in FIG. 7B. The surface of the part q1 is flush with the top surface of the convex portion Wb.

According to this embodiment, the following effects can be obtained.
(1) In the work trimming method of the present embodiment, a work W having a plurality of concave portions Wa and convex portions Wb (uneven shape portions) is placed on the punch 10 (lower die). In the subsequent second step, the pad 30 is relatively moved to the punch 10 side, and a portion of the concavo-convex shape portion of the workpiece W among the concavo-convex shape portions is crushed and crushed by the relatively moved pad 30 and the punch 10. q1 is formed, and a non-crushing portion r and a to-be-cut portion p where the remaining concavo-convex shape portion is held are partitioned and formed with the crushing portion q1 in between. In the next third step, by moving the die 20 relatively to the punch 10 side, the trim blade 14 that is a straight blade provided on the outer edge of the punch 10 and the trim blade that is a straight blade provided on the die 20. 14, the planned cutting site p is cut from the crushing site q1.

  As a result, according to the present embodiment, when trimming a workpiece having a concavo-convex shape portion, the cut surface shape of the trimmed cut portion can be stabilized and the mold cost can be suppressed. That is, the shape of the crushing site q1 serving as the cutting site does not change at all and can be stabilized. The trim blades (cutting blades) 14 and 22 are straight blades, and the sliding distance of the trim blades 14 and 22 with respect to the workpiece W when cutting can be shortened. The life of the trim blade can be improved. Further, it is not necessary to make the trim blades 14 and 22 in accordance with the uneven shape of the workpiece W, and the production cost of the mold does not increase.

  (2) In the workpiece trimming method of the present embodiment, the punch 10 (lower mold) is provided with a pressing portion 13 that forms a crushing portion q1 in cooperation with the pad 30 and a storage recess 15 adjacent to the pressing portion 13. Have. Further, in this trim method, the surface of the pad 30 on the punch 10 side has a flat surface, and in the second step, the work W is pressed by the pad 30 to move the uncrushed portion r into the storage recess 15. . As a result, according to the present embodiment, the surface of the crushed portion q1 can be flush with the top surface of the convex portion Wb.

  (3) In the workpiece trimming method of the present embodiment, the crushing sites q1 are formed at both ends of the workpiece W in the second step. As a result, it is possible to obtain a workpiece having crushing sites q1 at both ends of the workpiece W.

  (4) The trim mold of the present embodiment has a trim blade 14 that is a straight blade at the outer edge portion, and has a punch 10 (lower mold) on which the workpiece W is placed. Further, the trim mold has a pad 30 that is disposed relatively close to and away from the punch 10. The pad moves relative to the punch 10 side, presses the workpiece W placed on the punch 10, and crushes a portion q <b> 1 that crushes the concavo-convex shape portion at a part of the edge with respect to the workpiece W. , And a non-crushing portion r where the remaining concavo-convex shape portion is held and a planned cutting portion p are partitioned with a crushing portion q1 in between.

  Further, when the trim mold moves relatively to the punch 10 side, the die 20 having the straight blade trim blade 22 that cuts the planned cutting site p from the crushing site q1 in cooperation with the trim blade 14 of the punch 10 is provided. Prepare. The punch 10 is provided with a punch 10 having a storage recess 15 for storing the non-crushing portion r when the crushing portion q1 is formed. As a result, according to the present embodiment, when trimming a workpiece having a concavo-convex shape portion, the shape of the trimmed cut portion can be stabilized and the mold cost can be suppressed.

  (5) In this embodiment, the workpiece W is used as a separator that becomes an electrode of a fuel cell. Conventionally, in the case of the separator whose cross-sectional shape is not stable as described above, it causes the cell performance to vary as the electrode part of the fuel cell, but according to the construction method and the trim mold of the present embodiment, As an electrode component of a fuel cell, variation in cell performance can be suppressed.

In addition, you may change this embodiment as follows.
As an example of relative movement of the pad 30 to the punch 10 side, in the above embodiment, the punch 10 is fixed and the die 20 is movable. However, as an example of relative movement of the pad 30 to the punch 10 side, the die 20 is It may be fixed and the punch 10 may be moved. Further, the relative movement includes relative movement of both the die 20 and the punch.

  In the above embodiment, as shown in FIG. 8 (a), the crushing portions q1 are formed at the left and right ends of the work W. Instead of this configuration, the work W is shown in FIG. 8 (b). The crushing part q1 and the crushing part q2 may be formed on the entire four sides. In other words, the trim mold punch 10 is provided with a pressing portion for forming the crushing portion q2, and for cutting a planned cutting portion connected to the crushing portion q2 when the crushing portion q2 is formed. A trim blade may be provided on the die 20.

  -In the said embodiment, in the thickness direction of the workpiece | work W, the crushing site | part q1 is arrange | positioned at the convex part Wb side, and as shown in FIG.7 (b), the surface of the crushing site | part q1 is the top surface of the convex part Wb. And became to be the same. Instead of this, the crushing portion q1 may be arranged at a half of the thickness in the thickness direction of the workpiece W.

  In this case, as shown in FIG. 9 (a), the pressing portion 13 and the storing recess are mirror-image-symmetrically provided on the punch facing surface, which is the lower surface of the pad 30, with the pressing portion 13 and the storing recess 15 of the punch 10. The pressing portion 33 and the storage recess 35 having the same size as that of 15 are formed. Further, as shown in FIG. 9B, the storage recess 35 has a depth capable of storing the upper half in the thickness direction of the workpiece W in the second step. Further, the storage recess 15 has a depth capable of storing the lower half of the workpiece W in the thickness direction in the second step.

  If it does in this way, in a 2nd process, as shown to FIG.9 (b), FIG.9 (c), the crushing site | part q1 will be formed with the press parts 13 and 33, and the upper and lower half of the non-crushing site | part r will be stored in the storage recess Stored in each of 35 and 15. By carrying out like this, crushing site | part q1 can be arrange | positioned in the thickness direction of the workpiece | work W in the place of 1/2 thickness.

  Here, the storage recess 15 corresponds to a first storage recess. The storage recess 35 corresponds to a second storage recess. The pressing part 13 corresponds to a first pressing part, and the pressing part 33 corresponds to a second pressing part.

  Further, in the thickness direction of the workpiece W, the crushing portion q1 may be arranged on the concave portion Wa side. In this case, the pressing portion 13 and the storage recess 15 of the above embodiment are omitted, and the punch facing surface which is the lower surface of the punch 10 is adjacent to the pressing portion 33 and the pressing portion 33 as shown in FIG. The storage recess 35 is formed. In addition, as shown in FIG. 10B, the storage recess 35 has a depth that can store the workpiece W in the second step.

  As shown in FIGS. 10 (a) and 10 (b), the pressing portion 33 projects from the lower end surface of the pad 30 to form a crushed portion q1. In this embodiment, instead of omitting the pressing portion 13 of the punch 10 in FIG. 2 of the above embodiment, a pressing portion 33 may be provided on the pad 30 above the pressing portion 13.

If it does in this way, in the 2nd process, the whole non-crushing site | part r can be accommodated in the accommodation recessed part 35, and the crushing site | part q1 can be arranged near the recessed part Wa side in the thickness direction of the workpiece | work W.
Of course, in the embodiment shown in FIGS. 7B, 9C, and 10C, the position of the crushing portion q1 in the thickness direction of the workpiece W is an example, and the thickness direction of the workpiece W The position in may be other positions.

  In the above embodiment, the work W is formed in a rectangular shape when viewed in plan, but may have a shape other than the rectangular shape. What is necessary is just to comprise a trim metal mold | die according to the shape of the workpiece | work.

10 ... punch (lower mold), 12 ... bolster, 13 ... pressing part (first pressing part),
14 ... Trim blade of punch 10, 15 ... Storage recess (first storage recess),
20 ... Die (upper die), 22 ... Trim blade of die 20,
30 ... Pad, 33 ... Pressing part (second pressing part), 35 ... Storage recess (second storage recess),
40 ... slide, 50 ... elastic support,
L ... Trim line, W ... Workpiece,
Wa ... concave portion (uneven shape portion), Wb ... convex portion (uneven shape portion),
p: planned cutting site, q: planned site to be crushed, q1: crushed site,
r: Unsmashed part.

Claims (6)

A first step of placing a workpiece having a plurality of concave and convex portions on a lower mold;
The pad is relatively moved to the lower mold side, and by the relatively moved pad and the lower mold, a part of the concavo-convex shape part of the work is crushed to form a crushed portion. A second step of partitioning and forming a non-crushing part and a cutting scheduled part in which the remaining concavo-convex shape part is held with the crushing part in between,
By moving the upper die having a trim blade that is a straight blade relatively to the lower die side, the trim blade that is a straight blade provided on the outer edge of the lower die and the trim blade of the upper die, A third step of cutting the planned cutting site from the crushed site;
Trim method for workpieces including In the work trim method of claim 1,
The lower mold has a pressing portion that forms the crushing portion in cooperation with the pad, and a storage recess adjacent to the pressing portion,
The lower mold side surface of the pad has a flat surface,
In the second step, the work trimming method, wherein the work is pressed by the flat surface of the pad to move the non-crushing portion into the storage recess. In the work trim method of claim 1,
The pad has a pressing portion that forms the crushing portion of the workpiece in cooperation with the lower mold, and a storage recess adjacent to the pressing portion,
In the second step, a work trimming method in which the non-crushing portion is moved into the storage recess by being pressed by the lower mold. In the work trim method of claim 1,
The lower mold and the pad each have a first pressing part and a second pressing part that cooperate to form the crushing part of the workpiece, and the lower mold and the pad have the first pressing part. A first storage recess adjacent to the part and a second storage recess adjacent to the second pressing part,
In the second step, the workpiece trimming method in which the non-crushing portion is pressed by the pad and the lower mold and is stored in both the first storage recess and the second storage recess.   The work trimming method according to any one of claims 1 to 4, wherein, in the second step, the crushing portions are formed at at least both ends of the work. In a trim mold for trimming a workpiece having a plurality of uneven portions,
While having a trim blade that is a straight blade on the outer edge, a lower mold on which the workpiece is placed,
It is a pad that is disposed relatively close to and away from the lower mold, moves relatively to the lower mold side, presses the workpiece placed on the lower mold, and against the workpiece Forming a crushing portion that crushes the concavo-convex shape portion at the edge, and partitioning the non-crushing portion and the planned cutting portion where the remaining concavo-convex shape portion is held with the crushing portion in between,
An upper die having a trim blade of a linear blade that cuts the planned cutting portion from the crushing portion in cooperation with the trim blade of the lower die when relatively moved to the lower die side;
A trim mold having at least one of the pad and the lower mold having a storage recess for storing the non-crushing part when the crushing part is formed.

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