JPH0386328A - Press die - Google Patents

Abstract

PURPOSE:To prevent the sagging down of scrap by forming a projecting part with a small diameter on the scrap side at the same time of the punching of the material. CONSTITUTION:When the blank material 1 to be punched is fed on the upper surface of the lower die 22 of the mold 2, the projecting punch 7 which is integrated with the upper die blade 23 is descended with the press ram and the small diameter pushing punch 8 is pushed to the recess 10 of the opposing stripper plate 9 of lower die through the blank material 1 to be punched to form the small diameter projecting part 6. On the same time, the shearing operation for the plate material 1 is executed with the upper die blade 23 and the lower die blade. The plate material 5 which is worked with shearing is lifted to the press upper dead point in the bitten state with the upper die blade 23 and carried to the outside of the press die 2. At the same time, the scrap 3 of blank material after punching is moved back to the upper surface of the lower die blade 12 with the reaction force of the coil spring 11 which is connected with bolt to the lower die stripper plate 9. On this time, the projecting part 4 of the scrap 3 is bent with its top part toward the upper side by the formed small diameter projecting part 6 and becomes the state of having the rigidity.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a press die used for continuous punching in a press machine.

(Prior Art) The punching of large circular motor cores and the like is generally carried out by feeding the material out from a coil mill by roller feed, as shown in the figure. The press die 2 used for these punching processes has a female-shaped blade and an upper die consisting of a knockout plate for the purpose of separating the punched plates after punching.

It consists of a male-shaped cutter and a lower mold consisting of a stripper plate 9 having a spring for stripping the scrap after punching from the male cutter.

The punched board (m1 product) 5 punched out by the press drive is inserted into the female knife of the upper mold, is knocked off by the knockout mechanism at the top dead center of the press, and is removed from the press mold by a separate punching and taking-out device. will be transported to.

On the other hand, the action in the lower mold is that the scrap 3 after punching is returned to the upper surface position of the lower mold male cutter by the stripper plate 9 using the repulsive force of the coil spring, and is sent to the next punching position by roller feed, completing one cycle. Thereafter, this cycle is continuously repeated to perform the work.

(Problem to be Solved by the Invention) However, when material is fed by roller feed, it slides on the upper surface of the male cutter while carrying the protruding scrap after punching and is fed to the primary punching position, so the tip of the scrap touches the surface of the male cutter. It often gets caught in other punched holes, making automatic feeding difficult and preventing continuous punching.

SUMMARY OF THE INVENTION An object of the present invention is to provide a press die equipped with a mechanism for forming small-diameter protrusions into scraps during punching, thereby preventing the scraps from drooping down.

[Structure of the invention]

(Means for Solving the Problems) The press die of the present invention incorporates a small-diameter push punch at the base of the protruding blade of the upper die of the press die, and provides a recess in the opposing lower die stripper plate, so that a small diameter The protrusions are formed to prevent scrap from dripping down, eliminate snags on the upper surface of the cutter, and facilitate material feeding.

(Function) In the present invention, since the scrap of the punched protrusion is a molded protrusion, the tip is bent upward and maintains a rigid state. Therefore, the material is fed next by roller feed. On the other hand, the scrap can always be fed smoothly without getting caught between other cutting edges on the lower tool surface and the scrap.

Continuous punching is possible.

(Example) The present invention will be described below with reference to an example shown in FIGS. 1, 2, and 3. In FIG. 1, a blank material 1 is punched into a blank (product) 5 by a press die 2, and the remaining material is used as a scrap material 3 and is sent in the direction of arrow A by a press roller feed (not shown). A protruding scrap protrusion 4 is attached to the inner periphery of the scrap material 3 that has been fed in one step.

Moreover, the punched board (product) 5 punched out with the press die 2 is.

It is knocked out at the top dead center of the press while biting into the upper cutter, and is carried out in the direction of arrow B by a separate take-out device.

FIG. 2 is an enlarged view of the scrap protrusion 4 protruding from the inner periphery of the material scrap 3. This scrap protrusion 4 is a portion corresponding to the slot 4' of the punched board (product) 5 when the punched board (product) 5 is punched out from the punched material 1 with the press die 2, as shown in FIG. It is.

In the present invention, when a blank (product) 5 is punched out from a blank blank 1 with a press die 2, a small diameter protrusion 6 is formed near the base of a scrap protrusion 4 of a scrap material 3 as shown in FIG. The press mold 2 is characterized in that the press mold 2 is improved so as to simultaneously form the .

The press mold 2 according to the present invention has an upper mold 2 as shown in FIG.
1 and a lower mold 22. The upper die 21 is equipped with a small-diameter push punch 8 that is integrated with the protrusion punch 7 inserted into the upper die cutter 23 with a screw. In addition, the protrusion punch 7 of the upper mold 21 is attached to the lower mold stripper plate 9 of the lower mold 22.
A recess IO is provided at a position facing the . The opposing position of the small diameter push punch 8 and the recess 10 is the material scrap 3
This corresponds to the position where the small diameter protrusion 6 of the scrap protrusion 4 is formed.

Further, the lower die stripper plate 9 is located inside the lower die cutter 12 and is always biased upward by a coil spring 11.

In FIGS. 3a, b, and Q, when the blank l is fed onto the upper surface of the lower die 22 of the press die 2 of the present invention, the protrusion punch 7 integrated with the upper die cutter 23 It is lowered by the press ram, and the small diameter push punch 8 at the tip punches the punched material 1.
Recess 1 of lower mold stripper plate 9 facing through
0, the small-diameter protrusion 6 is pushed in as shown in Figure 3.
At the same time, the sheared punched board (product) 5 is subjected to shearing work on the punched board 1 by the upper die cutter 23 and the lower die cutter 12. It is lifted up to the top dead center and carried out of the press die 2 by a mechanism (not shown) as shown in FIG. At the same time, the blanked material scrap 3 is returned to the upper surface of the lower die cutter 12 by the reaction force of the coil spring 11 connected to the lower die stripper plate 9 with a bolt. At this time, the tip of the protrusion 4 of the scrap 3 is bent upward by the formed small-diameter protrusion 6 as shown in FIG. 3C, and becomes rigid.

Next, the material scrap 3 is sent in the direction of arrow A by a roller feed (not shown). At this time, by forming the small-diameter protrusion 6 at the base of the scrap protrusion 4 as described above, as shown in FIG. Punching can be performed smoothly one after another without getting caught by the blade.

〔Effect of the invention〕

As described above, according to the present invention, by forming a small-diameter protrusion on the scrap protrusion at the same time as the punching and shearing operation, there is no need for a complicated feeding mechanism, and the structure of the press die is significantly changed. This makes it possible to automatically feed the material without any problems, making it easier to perform continuous press punching with higher efficiency.

[Brief explanation of drawings]

Fig. 2 is a front view showing the press punching equipment for a large circular motor core using the press die of the present invention, and Fig. 2 shows the position of the small diameter protrusion of the scrap protrusion formed by the press die of the present invention. The schematic diagrams shown in FIGS. 3A, 3B, and Q are cross-sectional views showing the process of forming small-diameter protrusions of the press mold of the present invention. 1...Blanking material 2...Press mold 3...
・Material scrap 4...Scrap protrusion 5...
・Blanking (product) 6...Small diameter protrusion 7...Upper mold protrusion punch 8...Small diameter push punch 9...Stripper plate

Claims (1)

[Claims] In a press cutting die consisting of an upper die and a lower die, a small-diameter push punch is incorporated into the upper die cutter, and a recess is provided in the lower die stripper plate, so that a small-diameter protrusion is formed on the scrap side at the same time as the material is punched. A press mold characterized by: