JPH0735001B2 - How to make a shear press mold - Google Patents

Description

[Detailed Description of the Invention] a. Industrial field of application The present invention relates to a shear press type of press-working of thin metal plates, which performs edge-cutting (trimming) of the product after drawing and forming. Regarding the manufacturing method.

b. Conventional Technology For example, a draw-formed product (hereinafter, abbreviated as a work) a having a three-dimensional solid shape as shown in FIG. 15 is formed by drawing and then cutting unnecessary peripheral parts along a trimming line t. Therefore, an edge cutting press die as shown in FIG. 16 is generally used. In FIG. 16, b is an upper mold, c is a lower mold,
d is a work holder held by the upper die b, e and f are blades provided on the upper die b and the lower die c, and g is a presser spring that presses the work holder d downward. When the upper die b descends, the work holder d first restrains the work a, and then the unnecessary portion is separated along the predetermined trimming line t on the work a by the blade portion of the upper die b and the blade portion of the lower die c. Is performed.

In the edge cutting press die having such a structure, the upper die
b, the lower die c and the work retainer d are usually made of cast iron or steel plate, and the blade portions e and f of the upper die b and the lower die c are formed by inserting tool steel into the upper and lower dies. Alternatively, hard steel is overlay welded to form the blade. Further, the upper and lower molds may be partially or entirely made of cast steel. The work holder d and the work receiving surfaces of the lower mold c are machined by a die-cutting machine or manually.

c. Problems to be solved by the invention As described above, in the conventional press die, the tool steel is inserted when forming the blade portion in each of the upper and lower molds, or the blade portion is formed after the hard steel is welded by overlay welding. In addition, many processes such as cutting are required, and an expensive die-cutting machine is required for machining the cutting edge and machining the product positioning parts such as the workpiece holding surface of the work holder d and lower die c. There is a problem that a lot of cost and man-hours are required because finishing work is performed to obtain the required dimensional accuracy.

In view of the above circumstances, it is an object of the present invention to solve the problems of the conventional press die and to provide a method of manufacturing a shear press die having a relatively low manufacturing cost.

d. Means for solving the problem The present invention is to cut the steel plate to be the cutting blade to solve the above problems, along the cutting line to be the blade portion, the divided steel plate, the cutting end After parallel movement so that the parts overlap each other and contacting them, the contacting surfaces of these steel plates are overlapped along the trimming line of the workpiece and bent at the same time to make the upper and lower cutting blades. A method for manufacturing a shear press die is provided.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a structural explanatory view of a press die according to the present invention, in which 1 is an upper die base plate, 2 is an upper die cutting blade, 3 is a work holding piece, 4 is an upper die gauge plate, and 5 is an upper die. Support block, 6 upper die thrust receiving plate, 8 spacer block, 9 holding spring, 21 lower die press base plate, 22 lower die cutting blade, 23 lower die work support, 24 Is a lower gauge plate, 25 is a lower support block, and 26 is a lower thrust receiving plate.

In addition, 27 is a scrap cutter provided as needed.

First, the upper and lower cutting blades 2 and 22 are manufactured in the following manner. As shown in FIG. 2, an annealed tool steel plate 15 having a thickness of 2 to 5 mm is used, and after the reference line 17 of the cutting line 16 is provided on the steel plate 15, the cutting line 16 is cut off with a laser or the like. The cutting blade 2 and the cutting blade 22 are sampled by separating into two. The shape of the cutting line 16 is the developed shape when the mold is viewed from the side.

Next, as shown in FIG. 3, the cutting blades 22 of the cutting blade 2 that have been cut and separated are brought into contact with each other so that their cutting ends overlap,
The reference lines 17 are made to coincide with each other, and A shown
-Set so that line A and line BB are parallel. Then, according to the shape of the trimming line t, the contact surfaces EE of the two cutting blades 2.22 (see FIG. 4, which is a side view of FIG. 3) match the shape of the trimming line t. As shown in Fig. 5, perform overlapping bending. In this case, it is necessary to maintain the axis of bending (that is, the locus of the center point of R shown in FIG. 5) parallel to the reference line 17 and the contact surface E-E. In this way, the cutting blade 2 and the cutting blade 22 to be set in the press die are manufactured.

If there is a sharply changing trimming line, it is difficult to bend the laminated steel plates,
As shown in Fig. 6, a separate insert block is attached to that part.
18 may be provided and connected, and the blade portion (see blade tip T) of the cutting blade that coincides with the trimming line may be provided.

Next, the manufacturing procedure of the gauge plates 4 and 24 will be described. 7th
In the figure, in the cutting blades 2 and 22 manufactured by the above method, a steel plate (for example, tool steel) is accurately formed on the opposite side of the cutting edge T that matches the trimming line so as to match the surface 19 of the cutting blades 2 and 22. , For example, cut with a laser. Then, the steel plate is cut into a predetermined width and the necessary mounting holes are provided to manufacture the gauge plates 4 and 24. Of course, the necessary reference lines and markings are made prior to cutting.

Next, a method of manufacturing the thrust receiving plates 6 and 26 will be described.
First, during the edging process, side stress (side thrust) is applied to the cutting blades 22. With respect to the generated side stress, the range on the trimming line that can support the side stress from one direction is obtained from the plan view of FIG. 8 and the side view of FIG.
That is, for example, ranges v, w, y, z in the drawing are ranges on the trimming line that can support the lateral stress from one direction (each direction is indicated by an arrow).

As shown in FIGS. 10 and 11, the thrust receiving plate 6
・ The height of the cutting blade 2.22 protruding from the upper end of 26, that is, the dimension l is within 1.5 times the thickness of the cutting blade 2.22.

Here, when the trimming line is almost horizontal, the thrust receiving plates 6 and 26 have the same profile line as the gauge plates 4 and 24, so that it is sufficient to cut and collect each of the ranges and set them.

On the other hand, when the trimming line is inclined like the range y shown in FIGS. 8 and 9, the thrust receiving plate 6
The thrust receiving plate 6/26 may be set so that the dimension l of the entire region on the inclined portion is within 1.5 times the thickness of the cutting blade 2/22 while the 26 is adjusted to the inclination.

When the trimming line is a curved line and a curved thrust receiving surface is required, as shown in FIG. 12, the thrust receiving plates 6 and 26 contacting the surface 19 on the back side of the cutting blades 2 and 22 are provided. The curve of the surface may be obtained by CAD (Computer Aided Design) or the like, and this may be cut and processed as the curve of the contact surface of the thrust receiving plates 6 and 26.

Next, the assembling procedure will be described with reference to FIG. First, in the lower mold, the gauge plate 24 is set and fixed at a correct position from the mold reference line set on the upper surface of the base plate 21. Next, the support block 25 is placed on the gauge plate 24, the thrust receiving plate 26 is placed on the support block 25, the reference lines of the gauge plate 24 and the thrust receiving plate 26 are aligned, and a right angle Give out. Support block in this state
25 and the thrust receiving plate 26 with a mounting screw, etc.
Fixed to 24.

Next, the inner surface 19 of the cutting blade 22 bent according to the shape of the trimming line is brought into contact with the gauge plate 24 and the thrust receiving plate 26, and at the same time installed on the base plate 21 in line with the reference line, and this cutting is performed. The blade 22 is fixed to the gauge plate 24 and the thrust receiving plate 26 by means such as welding.

For the upper mold, the gauge plate 4 and the thrust receiving plate 6 may be installed on the base plate 1 in the same manner, and the cutting blade 2 may be fixed to these. If the height of the cutting blades 2 and 22 is too high in both upper and lower molds and there are other problems in terms of rigidity, for example, the spacer block 8 as described above may be provided in the upper mold or the like. The height of these cutting blades may be lowered.

Further, the scrap cutter 27 may be provided on the outer side of each cutting blade of both molds as needed.

It should be noted that the cutting blades 2 and 22 may be manufactured by the above-described method and then subjected to a slight finishing process, but the cutting edge portion (that is, the blade thickness from the cutting edge T that coincides with the trimming line is included). When it is necessary to provide a height difference on the surface of the blade), a work or model (shown by the chain line) that has been subjected to ready-made drawing as shown in FIGS. 13 and 14
Etc. may be set in the press die of the present invention, and the high and low portions (shown by diagonal lines) may be deleted or filled (buildup). This removal is done with a grinder, and the filling is done with resin after quenching.

For finishing of the cutting blades 2 and 22, when the male die (lower die) side, that is, the cutting blade 22 side is used as a reference, the blade tip is slightly ground and then hardened by frame hard etc. According to the above, the female (upper) cutting blade 2 may be ground or adjusted to quench it.

Next, the upper die work holder 3 and the lower die work support portion 23 may be molded from a synthetic resin or the like using a model.

Further, the support block 25 and the thrust receiving plate 26 can be replaced by pouring synthetic resin or low melting point alloy to back up the cutting blade. This can be adopted for all or part of the support block 25 and the thrust receiving plate 26.

The press die having the above-described structure manufactured by the above method may be used in the same manner as the conventional apparatus, that is, the work a to be edge-cut is set on the work support portion 23 of the lower die,
It is only necessary to lower the upper die and suppress the work a with the work holder 3, while separating the unnecessary portions by the upper and lower cutting blades 2 and 22.

e. Effects of the Invention As described above, the present invention uses a thin steel plate for a tool, cuts and separates the steel plate into two along a cutting line that is a blade portion of a cutting blade, and stacks the separated steel plates. The cutting blade is manufactured by simultaneously bending the workpiece along the trimming line, and the cutting blade is held by a gauge plate, a thrust receiving plate, or the like.

Therefore, compared to the conventional press die, it is easier to manufacture the blade part in each upper and lower dies, and the cutting work by an expensive die-cutting machine is unnecessary, and the finishing work by hand is also less, and the equipment cost is reduced. The effect of can be obtained.
It is also suitable for high-mix, small-scale production.

Needless to say, the present invention can be applied not only to the edge cutting process described in the above embodiment, but also to a general shearing press.

[Brief description of drawings]

FIG. 1 is a structural explanatory view of a shear press die manufactured by the method of the present invention, FIGS. 2 to 6 are explanatory views of a manufacturing procedure of a cutting blade manufactured by the method of the present invention, and FIG. Fig. 3 is a plan view before cutting, Fig. 3 is a plan view showing a state in which the steel plates shown in Fig. 2 are cut and superposed, Fig. 4 is a side view of the steel plates in the state shown in Fig. 3, and Fig. 5 is a plan view. Explanatory drawing showing a state in which the steel plate in the state of FIG. 3 is bent along a trimming line,
FIG. 6 is an explanatory view of the manufacturing procedure of the cutting blade when there is a sharply changing trimming line, FIG. 7 is an explanatory view of the manufacturing procedure of the gauge plate according to the present invention, and FIGS. 8 to 12 are the same thrusts. FIG. 8 is an explanatory view of the manufacturing method of the backing plate, FIG. 8 is an explanatory view showing the state of the side stress generated on the thrust backing plate on the trimming line of the work, FIG. 9 is a side view of FIG. 8, and FIG. Is an explanatory view showing the relationship between the thrust receiving plate and the blade portion of the cutting blade, FIG. 11 is a sectional view taken along the line DD in FIG. 10, and FIG. 12 is an explanatory view when the trimming line is a curve. FIG. 13 and FIG. 14 are explanatory views of a procedure for forming a blade portion of a cutting blade, FIG. 15 is a perspective view of a work, and FIG. 16 is a structural explanatory view of a conventional shear press type. 1 …… Upper mold base plate, 2.22 …… Cutting blade, 3 …… Workpiece restraint, 4/24 …… Gauge plate, 6.26 …… Thrust receiving plate, 21 …… Lower mold base plate, 16 …… Cutting line, a ... Work, t ... Trimming line, T ... Cutting edge.

Claims (1)

[Claims] 1. A steel plate to be used as a cutting blade is divided along a cutting line to be used as a blade portion, and the divided steel plates are moved in parallel so that their cutting end portions are overlapped with each other and abutted. ,
A method for producing a shear press die, characterized in that bending is performed at the same time while the contact surfaces of the steel sheets are overlapped with each other along the trimming line of the work to form cutting blades for both upper and lower dies.