JPS59110431A - Press punching die of thin plate - Google Patents

Abstract

PURPOSE:To prevent exactly a punching material of a thin plate from floating by providing a hard film on the lower circumferential wall which exceeds a punching stroke of a punch hole of a die, and reducing a sectional area, in a die of a metallic die. CONSTITUTION:In a press punching metallic die consisting of a blanking punch 1 and a die 4, a hard film 9 of TiC, TiN, etc. is provided on the lower circumferential wall which exceeds a punching stroke of a punch hole 5 of this die 4, and the lower sectional area of the punch hole 5 is reduced. In this way, a product obtained by blanking a thin plate 3 or a material such as a scrap, etc. are pushed into the lower part of the punch hole 5, and its floating can be prevented exactly.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a press-cutting die for thin plates, and more particularly to a press-cutting die that prevents lifting of the punched material of the thin plate during press-cutting. .

In order to prevent the lifting of the punched material during the press punching process in a press punching die for thin plates, conventionally a thin small hole 2 is drilled in the center of the puncher as shown in Fig. 1, and the thin plate 3 is By lowering the punch 1, the punch 4
The material 6, such as a product or scrap, punched into the punch hole 5 is blown downward by supplying high-pressure air from the thin small hole 2, or the material 6, such as a product or scrap, punched into the punch hole 5 is blown downward by a spring 7 at the center of the punch 1, as shown in FIG. A kick bin 8 that is pressed and protrudes from the tip surface is built in, and a material 6 such as a product or scrap obtained by punching out the thin plate 3 and punching it into the punch hole 5 of the die 4 by lowering the corbel 1 is placed in the kick bin 8. Alternatively, as shown in FIG. 3, the product or scrap material 6 punched into the punch hole 5 of the die 4 is suctioned from below the punch hole 5 using a vacuum cleaner. - However, if the material to be punched out by the punching process is a small item, it is not possible to make a thin small hole 2 in the center of the punch 1 for supplying high-pressure air or to incorporate a kick bin 8. Furthermore, the supply of high-pressure air and the protrusion of the kick bin 8 result in poor followability and reliability when punching is performed continuously at high speed. Further, it is not preferable to suck the punching material by means of a blower or vacuum blower which blows the punching material away by supplying high-pressure air, as this generates noise. Furthermore, since the kick bin 8 has a small diameter,
Weak strength and easily breaks. Further, in order to improve the followability of the kick bin 8 during high-speed punching, the spring 7 must be made strong.

The present invention has been made to solve such problems.
To provide a press-cutting die for a thin plate in which a punched material by press-cutting is forced into a part slightly smaller than the punched size to prevent lifting of the material.

As shown in FIG. 4, the press-cutting die for a thin plate of the present invention includes a press-cutting die consisting of a punch 1 and a die 4. TiC.

It is characterized in that a hard coating 9 of TiN or the like is provided.

In this way, in the press punching die of the present invention, TiC is applied to the lower circumferential wall that exceeds the punching stroke of the punch hole 5 of the die 4.
, TiN, etc., the lower cross-sectional area of the punch hole 5 is smaller than the upper cross-sectional area. Therefore, a material 6 such as a product or scrap obtained by punching a thin plate 3 into a punch hole 5 of a die 4 at the bottom of the S punch 1 is a punch hole with a small cross-sectional area and a hard coating 9 provided on the peripheral wall. It is pushed into the lower part of the inside of 5 to ensure that it does not come up. In addition, the punching process is performed continuously at high speed, and a huge number of punched products or materials 6 such as scraps are sequentially pushed into the lower part of the punch hole 5 and sequentially extruded and discharged below the punch hole 5. Even if the hard coating 9 of TiC, TiN, etc. on the lower peripheral wall inside the punch hole 5
has excellent wear resistance, so the cross-sectional area of the lower part of the punch hole 5 hardly changes, and therefore materials 6 such as punched products or scraps that have been used for a long period of time are not pushed in and lifted up. .

Next, in order to clarify the effects of the press-cutting die according to the present invention, specific examples and conventional examples thereof will be explained.

[Example 1] As shown in Fig. 4, the punch consists of a punch 1 with a rectangular cross section of 0.791 EJI on one side, and a die 4 having a punch hole 5 with a rectangular cross section of 0.80 m on a side and a depth of 3 mm. 4
A T with a height of 1M and a thickness of 2μm is attached to the lower peripheral wall inside the punch hole 5 of
A brass plate 3 with a thickness of 0.6 mm was continuously punched using a press punching die in which a hard coating 9 of iN was provided by ion blating. There was no lifting of the removed product at all.

[Example 2] As shown in FIG. 4, a punch 1 with a rectangular cross section of 2.9u on one side and 3. It consists of a die 4 having a punch hole 5 with a rectangular cross section and a depth of 3 mm, and a TiN layer with a height of 1 mm and a thickness of 2 μm on the lower peripheral wall of the punch hole 5 of the die 4.
When a brass plate 3 with a thickness of 0.6 mm was continuously punched out using a press-cutting die in which a hard coating 9 was formed using ion blasting, even after 10 million pieces had been punched out. There was no lifting of the punched product at all.

[Conventional Example 1] - As shown in FIGS. 1 and 2, a punch 1 with a rectangular cross section of 2.9 mA on one side and a die 4 having a punch hole 5 with a rectangular cross section of Q, 3 Q m on one side and 3 mm in depth are used. As shown in the drawings, each of the press-cutting dies is made by supplying high-pressure air to the punch 1 and drilling a narrow small hole 2 that blows out from the tip surface, and by punching a punch 1 with a kick bottle that is pressed by the punch IK spring 7 and protrudes from the tip surface. Since it is impossible to incorporate 8, the thickness is 0.
6M brass plate 3 was continuously punched, with an average of 1
Lifting of the punched product occurred at a rate of 1 in 000 pieces.

[Conventional Example 2] As shown in FIG. 2, a punch 1 having a rectangular cross section of 2.9 u on one side and a die 4 having a punch hole 5 with a rectangular cross section of 3.0 MJ on a side and a depth of 3 are formed. Brass plates 3 with a thickness of 0.6 mm are continuously cut using a press die in which a punch 1 includes a kick pin 8 with a diameter of 0.7 mm that is pressed by a spring 7 and protrudes from the tip surface. When the punching process was performed, the kick bin 8 broke after 400,000 to 600,000 pieces, and it was not possible to prevent the punched products from lifting up afterwards.

As detailed above, the press punching die of the present invention is provided with a hard coating on the lower circumferential wall of the punch hole of the die, and the lower cross-sectional area of the punch hole is small. The material is forced into the punch at the bottom to ensure that it does not lift up. Furthermore, since the hard coating has excellent abrasion resistance, it does not wear out even when used continuously for a long period of time, and has the effect that materials such as punched products or scraps do not lift up.

[Brief explanation of the drawing]

1 to 3 are schematic longitudinal sectional views of conventional press-cutting molds for thin plates, and FIG. 4 is a schematic longitudinal sectional view of a press-cutting die for thin plates according to the present invention. 1. Punch, 3. Thin plate, 4. Gui, 5. Punch hole, 6. Material such as punched product or scrap, 9. Hard coating. Applicant: Tanaka Kikinzoku Kogyo Co., Ltd. Figure 1 - Figure 3 Figure 2 Figure 4

Claims (1)

[Claims] 1. A press-cutting die for a thin plate comprising a punch and a die, characterized in that a hard coating is provided on a lower circumferential wall of the die that extends beyond the punching stroke of the punch hole.