JPS63165026A - Press die - Google Patents

Abstract

PURPOSE:To reinforce the fixture of a slug and a die and to prevent a scum riser as well by forming the notch in the thickness direction thereof on the peripheral edge of the scum by the 2nd cutting edge part provided on a notch part in continuation. CONSTITUTION:After executing a specific circular punching by a punch 103 and the 1st cutting edge part 11a of a die 11 on the member 101 to be worked a linear notch is formed in the plate thickness direction at the peripheral edge by a 2nd cutting edge part 11a on a caused slug. The slug 12 is slightly expanded by punching of a 1st cutting edge part 11a and a notch 12a by the 2nd cutting edge part 11b is formed on the peripheral edge of the expanded part thereof. A projecting part 12b is caused at the outside of the notch 12a with this notch 12a being formed and the rising move of the slug 12 by its adherence to the punch 103 is blocked with the 1st cutting edge part 11a becoming a stopper.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) This invention is applied to a die in a press mold.

(Prior Art) Conventionally, when punching is performed using a press die using a press machine, for example, the workpiece 104 is cut out with a stripper 105 interposed therebetween, so that the blanks 101 are curved during punching, as shown in FIG. Therefore, the diameter of this scrap is larger than the inner diameter of the die 102. Then, the punched swarf sticks to the cutting edge 102a of the die due to the force of trying to restore itself inside the die 102, but if the adhesion is weak, the punch 10 rises from the bottom dead center.
3 (the illustrated punch is detached from the die and positioned above) and rises. Although it is designed to prevent so-called "dross lifting," if this adhesion force is weak due to the type of workpiece material, deviation in plate thickness, etc., "dross lifting" will occur. Note that 104 is a workpiece, and 105 is a stripper.

(Problems to be Solved by the Invention) As a means of solving the above-mentioned "dross removal", a discharge coating is formed on the inner wall surface of the die to make the surface rough.
The disadvantage was that the punch was subject to severe wear. In addition, the method of lowering the bottom dead center of the punch and inserting the punch deeply into the die causes severe wear on the punch.Furthermore, there is also a method of suctioning the punched dregs, but this method has the disadvantage of complicating the structure of the device.

The present invention provides a press mold structure that eliminates the "dross lifting" that occurs in the conventional press molds.

[Structure of the invention]

(Means for Solving the Problems) In the press die of the present invention, the cutting edge of the die is connected to the first cutting edge portion of the punching shape, and the thickness of the die is connected to the first cutting edge portion. It has a feature that it includes a second cutting edge portion that brings a plurality of knife-like protrusions into contact with each other to form directional cuts.

(Function) This invention takes advantage of the fact that the scraps punched out by the first cutting edge section are larger than the die diameter, and the second cutting edge section provided continuously with the cutting edge section removes the punched scraps. A notch is formed on the periphery in the thickness direction to strengthen the adhesion of the scraps to the die, and to completely prevent "dross lifting" at the boundary between both cutting edges.

(Embodiments) Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in the description, parts that are the same as in the prior art are indicated by the same reference numerals as in the prior art in the drawings, and the description thereof will be omitted.

FIG. 1 shows a press die according to an embodiment, with a sectional view shown in a, a bottom view shown in b, and a plan view of scraps shown in C.

In FIGS. 1a and 1b, a shows a cross-sectional view taken along line AA in b, and 11 is a die, the upper part of which is a cutting edge of a circular inner wall for punching a workpiece 104 in an example of a circular shape. A first cutting edge portion 11a formed in the first cutting edge portion, and a second cutting edge portion 11b of an internal gear-shaped blade portion connected to the lower end of the first cutting edge portion.
It consists of

With the above configuration, the workpiece 104 is punched in a predetermined circular shape by the punch 103 and the first cutting edge 11a of the die 11, and then the resulting punched chips are stamped on the periphery by the second cutting edge 11b. A linear cut is formed in the thickness direction of the plate. That is, as shown in FIG. 1C, the scraps 12 are placed in the first
By punching with the cutting edge 11a (diameter A), the diameter B is slightly expanded,
B>A), a cut 12a is formed by the second cutting edge portion 11b at the peripheral edge of the expanded portion. Moreover, by forming this cut 12a, the meat of the cut portion protrudes outside of this cut 12a to form a protrusion 12b. A part of FIG. 1C is shown enlarged in FIG. 1D to show the shape of the protrusion 12b, notch 12a, and protrusion 12b.

The protruding portion 12b formed as described above is the first cutting edge portion 11
Since it protrudes from the periphery of the punched chips expanded by punching by a, the movement of the punched chips 12 adhering to the bunch 103 and rising (chill up) is prevented by the first cutting edge portion 11a acting as a stopper.

Next, the present invention can prevent scraps from rising even when punching the edge of a metal strip with a parallel portion thereto, as shown in FIG. 2, for example. FIG. 2 shows another embodiment,
A is a side view of the press mold, b is a plan view of the product after punching, and C is a plan view of the punched pieces. In this case, only the shape of the die 21 is slightly different from that of the die of the above embodiment, and the straight part is the main part.
The scraps are also slidably supported by the slider, and the scraps also slide down and reach the relief portion 116. The cutting edge of the die 21 consists of a linear first cutting edge 21a and a second cutting edge 21b connected to this and having rack-shaped teeth at the lower part. Therefore, the scraps 22 are as shown in FIG. 2C.

A notch 22a is provided by the second cutting blade 21b in the widened part created by punching by the first cutting blade 21a, and
Projections 22b are formed on both sides of this notch 22a.

This embodiment is similar to the embodiment described above in that the protruding portion 22b prevents the scraps 22 from rising at the lower end of the first cutting edge.

Next, the present invention can prevent scrap from rising even when, for example, a rectangular punch is made on the edge of a metal strip as shown in FIG. In the embodiment shown in FIG. 3, a is a side view of the press die, b is a plan view of the product after punching, and C is a plan view of the punched material. In this embodiment, only the shape of the die 31 is different from the die 21 described above, and the scrap 32 is rectangular and has notches 32a on three sides, and protrusions 32b are formed on the sides to prevent scrap from rising. . In addition, 31
A is a first cutting edge portion, which is continuously provided with the second cutting edge portion 31b. In the case of this embodiment, the case where the notches 32a were provided on three sides of the scrap 32 was exemplified.

The effect can be seen even if applied to one of the three sides.

〔Effect of the invention〕

According to this invention, in punching a plate of metal or the like, the adhesion between the punched scraps and the die is strengthened, and scrap lifting is completely prevented. Therefore, there is no problem with the subsequent punching due to scrap lifting, and there are advantages such as significantly improving manufacturing yield and product quality, and facilitating maintenance of the device.

[Brief explanation of the drawing]

FIG. 1a is a cross-sectional view of a press mold according to an embodiment of the present invention.
The figure is a bottom view of the die in Figure 1a, Figure 1C is a plan view of the punched scrap, Figure 1d is an enlarged plan view of a part of Figure 1C, and Figure 2a is a book. A side view of a press die according to another embodiment of the invention, FIG. 2 is a plan view of the product after punching, FIG. 2 C is a plan view of the blank, and FIG. 3 a is still another embodiment FIG. 3 is a plan view of the product after punching, FIG. 3C is a plan view of the blank, and FIG. 4 is a sectional view of the conventional press die.

Claims (1)

[Claims] The cutting edge of the die in a press mold consisting of a punch and die is
A first cutting edge portion having a punching shape, and a plurality of knife edge-shaped protrusions connected to the first cutting edge portion and facing each other so as to form a linear cut in the thickness direction at the periphery of the punched scrap. A press mold characterized by comprising a second cutting edge part.