JPH03138028A - Scrap cutting method - Google Patents

Abstract

PURPOSE:To drop the divided scrap without being caught and to improve the productivity by cutting the annular scrap part protruded from the lower die with the scrap cutter of the upper die in the frame width direction and then cutting the scrap from the products part with the outer circumferencial trimming punch and the lower die. CONSTITUTION:The work 12 is set on the lower die 11 in the protruding state of its circumferencial annular scrap part 126. Next, two positions, at least, of the annular scrap part 12b are notched with the scrap cutter 13, 14 set at the upper die 16 in the frame width direction. After then, by cutting the boundary 12c of the annular scrap part 12b and the products parts 12a of its inside with the outer circumferencial trimming punch 15 and the lower die 11, the annular scrap part 12b is divided from the notch 12d to the plural, to drop and to be housed in the storage. Therefore, the scrap is not caught to anywhere, so the manufacture of the products is smoothly executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a scrap cutting method in which scrap parts of a workpiece produced during press working are separated and cut into a plurality of parts and dropped into a predetermined scrap storage section.

[Prior Art] In the conventional scrap cutting method, a workpiece 2 is placed on a lower mold 1 as shown in FIG. At the same time, the workpiece 2 is cut and separated into a product part 2a and an annular scrap part 2b by the outer circumference trim punch 4 shown by the chain line, and at the same time, the scrap part 2b is cut by the upper scrap cutter 5 and the lower scrap cutter 6 attached to the upper mold 3 and the lower mold 1, respectively. The method used was to cut the scrap part 2b in the width direction across the edges, divide the scrap part 2b into a plurality of parts, and drop the scrap parts 2b onto a scrap chute 7.8. Specifically, as shown in FIG. 8, four sets of scrap cutters 5.6 are arranged in a cross shape, and these scrap cutters 51
6, the scrap portion 2b of the work 2 is cut in the width direction to divide it into four pieces. Then, the scrap part 2b divided into four parts is transferred to the scrap chute 7 by its own weight.
．． 8, and stored in a scrap storage section (not shown).

[Problems to be Solved by the Invention] However, in the conventional scrap cutting method, even if the scrap part 2b can be cut by the upper and lower scrap cutters 5 and 6, each cut and divided into four parts There has been a problem in that the scrap portion 2b is often caught on the lower scrap cutter 6 or on the seat surface 9 of the lower scrap cutter 6 and does not fall into the scrap chute 7.8. As a result, the scrap portion 2b caught on the lower scrap cutter 6 and the like will remain there each time it is processed, and there is a risk that the mold will be damaged.

[Means for Solving the Problems] The present invention has been made in view of the above-mentioned conventional problems, and includes a workpiece made of a plate material placed on a lower die with an annular scrap portion on the periphery protruding. , After making cuts in the width direction in at least two places of the annular scrap part with a scrap cutter attached to the upper mold, the boundary between the annular scrap part and the product part inside thereof is cut with a peripheral trim punch and the lower mold. The scrap cutting method is characterized in that the annular scrap part is divided into a plurality of parts and dropped from the cut part by cutting between the parts.

[Operation]According to such a means, first, the peripheral edge of the workpiece that protrudes from the lower die, that is, the annular scrap part, is cut from above in the width direction by a scrap cutter attached to the upper die, and two parts are cut into this scrap part. Two notches are formed. The scrap portion thus cut is separated from the product portion by the outer circumferential trim punch and the lower mold, which descend later than the scrap cutter.

Then, by cutting with this outer circumferential trim punch, the scrap part is divided into two parts from the notch part and dropped from the product part. At this time, since there is nothing disposed below the scrap part to prevent it from falling, each of the two divided scrap parts falls freely under its own weight and is stored in a scrap storage part or the like. As a result, continuous production of the product part of the workpiece is carried out smoothly, and production efficiency is improved.

[Example] Hereinafter, this invention will be explained based on examples.

1 to 6 are views showing one embodiment of the present invention, and FIG. 1 is a schematic cross-sectional view of a press apparatus for carrying out the scrap cutting method of the present invention.

The lower mold 11 has a product placement part 11a whose upper end is formed to correspond to the shape of the product part 12a of the workpiece 12, and a vertical side surface 11c. Above the lower mold 11, an upper mold 16 having a recess 17 opening downward is arranged so as to be movable up and down. A pad 19 is held within the recess 17 of the upper mold 16 so as to be able to move up and down within a predetermined range, and a spring 1B+ 18 is interposed between the upper mold 16 and the pad 19 to bias the pad 19 downward. ing.

Scrap cutter 13.14 has its side padded 19
and the lower cutting edge 13a.

It is vertically installed on the lower surface of the upper die 16 with the holder 14a facing in the width direction of the scrap portion 12b of the workpiece 12. The cutting edges 13a+ 14 of these scrap cutters 13 and 14
As shown in FIG. 2, a is formed into a knife shape, and the width of the cutting edge 13a+14a is set approximately equal to the width of the scrap portion 12b of the workpiece 12.

Further, the scrap cutters 13, 14 are arranged at intervals of 180°, as shown in FIGS. 1 and 2.

The outer circumferential trim punch 15 is formed in an annular shape and is attached to the lower surface of the upper die 16 with its inner surface abutting the side surface 19c of the pad 19. The cutting edge 15a of this outer circumference trim punch 15 is formed at the lower end of the inner surface of the outer circumference trim punch 15.
The inner surface of the workpiece 12 is as shown by the two-dot chain line in FIG.
It is formed in a shape that matches the closed curve formed by the boundary 12c between the product part 12a and the scrap part 12b. Moreover, the height position of this cutting edge 15a is the same as that of the scrap cutter 13.
It is set higher than the cutting edge 13a+14a of No. 14. As a result, the cutting operation of the outer periphery trim punch 15 to the scrap portion 12k) is performed by the scrap cutter 131.
14 is set to be performed later than the cutting operation into the scrap portion 12b.

In order to guide the scrap portion 12b cut by the outer periphery trim punch 15 to a scrap collecting section (not shown), a pair of outer periphery trim punches 15 are provided directly below the outer periphery trim punch 15, as shown by the dotted line in FIG. 1 and in FIG. scrap guide 2
0.21 is allocated. This scrap guide 20
．． 21 is at 90° with respect to the scrap cutters 13 and 14
It is attached to the side surface 11C of the lower die 11 at a shifted position. These scrap guides 20, 21 are formed so as to be inclined from the upper end of the side surface 11C toward a scrap storage section (not shown). Next, the operation of carrying out the scrap cutting method using the press apparatus having such a configuration will be explained.

When the upper mold 16 is lowered toward the work 12 placed on the lower mold 11, the pad 19 is lowered together with the upper mold 16 toward the work 12 and comes into contact with the work 12. When the upper mold 16 is further lowered from this state, the spring 18.
18 is compressed, and the pad 19 is pressed by the upper die 16 to fix the workpiece.

When the upper mold further descends, the scrap cutters 13 and 14 provided on the upper mold 16 slide along the side surface 19c of the pad 19 and descend together with the upper mold 16, as shown in FIGS. 2 and 3(a). As shown in (b), the cutting edges 13a+14a abut against both sides of the scrap portion 12b.

From this state, when the upper die 16 is further lowered and the scrap cutters 13+14 are pushed down, the scrap portion 12k
) are cut in the width direction by the scrap cutter 13, 14, and a third
Cuts 12d, 12d as shown in Figure (c) are formed. In addition, as shown in FIG. 4, the product part 12 of the work 12
Since the pad 19 presses and fixes the scrap cutter 13.14 on the lower mold 11 by the pad 19, when the scrap cutter 13.
4 concentrates, and as shown in FIG. 3(a), the parts of the scrap part 12b on both sides of the cuts 12d, 12d break along the boundary 12c with the product part 12a and are pushed downward.

On the other hand, the outer circumferential trim punch 15 also uses the scrap cutter 13.
114, its inner surface is attached to the side surface 19C of the pad 19.
While sliding the scrap cutters 13 and 14 together with the upper mold 16, it descends as shown in FIGS. 3(a) and 3(b).

However, as shown in FIG. 1, the height position of the cutting edge 15a is the cutting edge 13a+ 14 of the scrap cutter 13*14.
Since the cutting edge 15a is set higher than the boundary 1 of the workpiece 12 after the scrap cutter 13.14 cuts into the scrap part 12b as shown in FIG.
It will reach 2C.

When the outer circumferential trim punch 15 is further pushed down from this state, as shown in FIG. disconnected. At this time, notches 12d are formed on both sides of the scrap part 12b as shown in FIG. 3(C),
12d, the scrap part 12b has the cut 12d.
, is divided into two parts with 12d as the border.

Then, as shown in FIGS. 2, 4, and 5, these two divided scrap parts 12b, 12b fall toward the scrap guide 20.21 due to their own weight.

Since there are no falling obstacles between the upper end of the lower mold 11 and the scrap guide 20.21, these scrap parts 12b, 12b are reliably placed in the scrap guide 20.21.
It then falls down and then slides down along the inclined surface of the scrap guide 20, 21 and is stored in a scrap storage section (not shown).

In this way, the cut and divided scrap parts 12b,
Since the product part 12b is stored in the scrubber/tub storage part without being caught anywhere, continuous production of the product part 12a can be carried out smoothly, and production efficiency can be improved.

Here, the plate thickness t (mm) and the width L of the scrap portion 12b that enables the notch forming process by the scrap cutters 13 and 14 and the cutting and dividing process by the outer circumferential trim punch 15
(mm) is shown in FIG. 6. According to this data, the plate thickness t and the width of the plate approximately maintain a negative gradient linearity, and for example, the plate thickness of the scrap portion 12b is approximately 3
When rr+m, it is shown that it is possible to form cuts with the scrap cutters 13 and 14 and cut and divide the scrap portion 12b with a width of up to 4 mm using the outer circumferential trim punch 15.

In this embodiment, the scrap cutter 13.14 and the outer trim punch 15 are integrally attached to the upper die 16, but the structure is not limited to this. Divided and outer trim punch 15 is a scrap cutter 13.14
Of course, the same effect as this embodiment can be obtained by setting the operation to be delayed.

[Effects of the Invention] As explained above, according to the present invention, the scrap part of the workpiece placed on the lower die can be placed on the upper die without providing anything below the scrap portion of the workpiece that would become an obstacle to falling. Since the scrap section is cut and divided from above using the attached scrap cutter and peripheral trim punch, the multiple cut and divided scraps fall freely without getting caught anywhere and are stored in the designated scrap storage section. obtain. As a result, continuous production of products can be carried out smoothly and production efficiency can be improved, which is a practically beneficial effect.

[Brief explanation of the drawing]

1 to 6 are diagrams showing one embodiment of the scrap cutting method of the present invention. FIG. 1 is a cross-sectional schematic diagram of a press device embodying the principle of this scrap cutting method, and FIG. A schematic perspective view showing the cutting relationship between the scrap cutter and the outer circumferential trim punch used in the press device shown in the figure. Figures 3 (a) to (c+) are explanatory diagrams showing the cutting state of the scrap part. Figure 4 is an illustration of the cutting state of the scrap part. A schematic cross-sectional view of the press device showing the state after cutting; Fig. 5 is a plan view for explaining the falling state of the scrap part to be divided; Fig. 6 is a diagram of the relationship between the width of the scrap part and the plate thickness; Figures 7 and 8 are diagrams showing the conventional example, Figure 7 is a cross-sectional schematic diagram showing the state where the scrap part is cut, and Figure 8 is a layout diagram of the upper and lower scrap cutters used in Figure 7. be. 11... Lower mold 12... Work 12a... Product part 12b... Scrap part 12c... Boundary 12d... Cut 13.14... Scrap cutter 15... Outer circumference trim punch 16...・Upper mold Fig. 1 16: Upper mold Fig. 2 Fig. 3 (C) (C1)

Claims (1)

[Claims] A workpiece made of plate material is placed on the lower die with the annular scrap part at the periphery protruding, and cuts are made in the width direction at least at two places in the annular scrap part with a scrap cutter attached to the upper die. After that, the boundary between the annular scrap part and the product part inside thereof is cut between the outer circumferential trim punch and the lower mold, and the annular scrap part is divided into a plurality of parts and dropped from the cut part. A scrap cutting method characterized by