JPH0358830A - Manufacture of punch stripper - Google Patents

Abstract

PURPOSE:To simply perform repairing and replacement and to prepare a stripper with good workability by constituting a stripper plate of a splitting and assembling system. CONSTITUTION:At least one sheet-like elastomer 6a is punched by a punch 5 and the inner peripheral surface of the hole of the punched elastomer 6a is externally fitted to the outer peripheral surface of the punch 5 in a close contact state. Further, the elastomer 6a is pressed and fixed to the root part of the punch 5 and, subsequently, at least one next sheet-like elastomer is punched in the same way to be externally fitted to the outer peripheral surface of the punch 5 in a close contact state and superposed on the first sheet-like elastomer. Hereinafter, by repeating the same work, the sheet-like elastomers 6-a - 6-j of a laminated structure formed so as to be laminated in order from the root part of the punch 5 to the leading end part thereof until protruding from the leading end part by predetermined quantity are used as a stripper plate 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a punch stripper used for piercing.

[Conventional technology]

Conventionally, in piercing processing (punching processing) using a piercing punch, the plate material (bannel) is
When pulling out the piercing punch from the piercing punch, the piercing punch is easily removed from the plate by pressing the plate against the die using an elastic bonch IJper.

An example of a conventional punch stripper of this type is shown in FIG.

The figure is a cross-sectional view of a conventional type (from Nikkan Kogyo Shimbun, Press Editing Data Book P49-50), with an upper mold 21 and a lower mold 22. The lower mold 22 has a die 23, and the upper mold 21 has A punch 26 and a punch stripper 27 are provided.

The plate material 30 is placed on the gui plate 24 of the die 23,
In response to this, the upper die 21 descends, and the punch stripper 27
The plate material 30 is pressed by a steel stripper plate 28 provided at the lower part of the plate, and then the punch 26 is lowered and the plate material 30 is punched into a predetermined shape by the punch 26 and the gouging button 25. The main purpose of the stripper plate 28 is to prevent deformation of the plate material 30, and a spring 29, urethane rubber, etc. are used as means for pressing the plate material 30.
8 has a structure in which it is held by the upper mold.

Furthermore, in Japanese Patent Application Laid-Open No. 63-68230, when forming a panel stripper, that is, the above-mentioned IJ perforator, instead of forming a combination of an IJ per plate and a spring as described above, A mold is formed between the outside of the punch and the goo, a resin solution is injected into this, hardened, and the resin is punched out using the punch to form the piercing hole of the punch stripper (the hole where the tip of the piercing punch appears). A method of manufacturing a punch stripper is disclosed. This is because if there is a gap between the inner peripheral surface of the piercing hole of the punch stripper and the outer peripheral surface of the piercing punch,
This method is used to solve the problem that when the piercing punch is pulled out, the peripheral edge of the hole in the punched plate turns inward, causing a hole. It is proposed that the inner diameter of the piercing hole of the piercing hole and the outer diameter of the piercing punch be made to substantially match to eliminate the gap between them, thereby preventing the occurrence of the piercing.

[Problem to be solved by the invention]

In the case of the above-mentioned conventional punch stripper that combines a stripper plate and a spring, multiple springs are usually required in order to obtain the specified pressing force that prevents the plate from deforming, which requires a large space. At the same time, the number of structural parts for the stripper plate increases. If the punching profile becomes complicated in this way, a large amount of time will be required to process the profile of the stripper plate along the outer wall of the punch. Further, when the stripper plate, which has been manufactured by taking many man-hours, is damaged due to punching holes or warping of the plate material, there is a problem that it cannot be easily repaired and replaced.

Regarding the method for manufacturing a punch stripper proposed in JP-A No. 63-68230, there is no gap between the pierce hole in the plate material and the pierce punch, and it is recognized that it is effective in preventing the occurrence of cracks in the product. For production, create a formwork,
There are other problems, such as the use of a resin solution, which is time-consuming and requires a large number of man-hours, and it is difficult to adjust the pressing force against the plate material, and furthermore, it is not easy to repair or replace the plate when it is damaged.

Therefore, the present invention has been made to solve the above-mentioned problems, and is a method for manufacturing a stripper plate that can be easily repaired and replaced by assembling the stripper plate in parts, and can be manufactured with good workability. The purpose is to provide

[Means to solve the problem]

In order to solve the above problems, the present invention provides a method for manufacturing a punch stripper used to hold down a plate material when pulling out a piercing punch from a plate material after piercing, comprising:
Punch out at least one sheet-like elastic body with the punch, insert the inner circumferential surface of the hole in the punched elastic body tightly into the outer circumferential surface of the punch, and further insert the elastic body into the base of the punch. Press and fix it, then punch out at least one next sheet-like elastic body in the same way, insert it tightly into the outer circumferential surface of the punch, overlap it with the first sheet-like elastic body, and repeat the same operation to make the punch. Provided is a method for manufacturing a punch stripper, characterized in that a stripper plate is a sheet-like elastic body having a laminated structure formed by sequentially stacking layers from the root portion to the tip portion and further protruding from the tip portion by a predetermined amount. do.

[For production]

In order to make the IJ per plate a laminated structure of sheet-like elastic bodies, first a sheet-like elastic body is punched out with a punch, and when the punch reaches the bottom dead center, the punched sheet-like elastic body (sheet-like elastic body) is fitted to the base of the punch. Due to the elastic force of the sheet-like elastic body, the sheet-like elastic body is tightly inserted up to the base of the punch. By going through this process several times, a stripper plate with a laminated structure is obtained. After the sheet-like elastic body forming the lowermost surface of the stripper plate is similarly punched out, it is inserted tightly into the outer circumferential surface of the punch, but as the punch rises, the stripper plate swells toward the tip of the punch due to its elastic force. } A portion of the sheet-like elastic body forming the lowermost surface of the IJ bumper plate protrudes from the tip of the punch. As a result, the amount of protrusion is smaller than the thickness of one sheet-like elastic body, and an appropriate amount of protrusion can be obtained.

〔Example〕

Examples will be described with reference to the drawings.

First, a punch 5 punches out a certain elastic body 5-a from a sheet of urethane rubber, hard rubber, etc. using a certain punching die from the upper die 1 and the lower die 2 shown in FIG. It is placed on the upper surface of the die 4 in the raised state, and the punch 5 is lowered and punched with the punch 5. The punched elastic body 6-a is tightly inserted into the outer peripheral surface 5a of the punch 5 and fixed to the base portion of the punch 5.

Next, when the punch 5 is raised, the elastic body 6-a also rises together in close contact with the base of the punch 5. Next, the elastic body 6-b is placed on the die 4, and the same process as before is carried out. Punching is performed using a punch 5. As a result, the elastic bodies 5-a and 6-b overlap at the base of the punch 5 and are tightly inserted into the punch 5. Hereinafter, the elastic bodies 6-c to 6-j
The above operation is repeated one by one until the last elastic body 6-j has a thickness such that it protrudes a predetermined amount from the tip of the punch 5 when the punch 5 is in the raised position after punching. By this method, as shown in the figure, a plurality of sheet-like elastic bodies 6-a to 6-j are finally attached to the punch 5.
IJP plate 6
is produced.

The stripper plate 6 made in this way has sheet-like elastic bodies 6-a to 6-j as each element on the outer circumferential surface 5 of the punch 5.
Since they are stacked and fixed one after another in close contact with a, they will not fall from the punch 5.

The pressing force of the IJ per plate 6 against the plate material 3 during the pressing operation is due to the stripper plate 6 protruding from the tip surface 5b of the punch 5 when the upper and lower molds 1.2 are opened, that is, the sheet-like elastic material described above. Adjust according to the amount of body protrusion. This protrusion amount can be finely adjusted by arbitrarily changing the thickness of the sheet-like elastic body, and in order to ensure the optimum protrusion amount, the sheet-like elastic bodies 6-a to 6
-j has a laminated structure so that the thickness can be changed arbitrarily. Further, the pressing force can be easily adjusted by cutting the outer circumferential shape 8 of the sheet-like elastic bodies 6-a to 6-j to an arbitrary size using scissors or the like according to the outer circumferential shape of the plate material 3. . Due to these, the pressing force acts vertically and uniformly on the entire surface of the plate material 3 located on the pressing surface 7, and deformation of the plate material during punching is prevented.

Also, on the pressing surface 7 side, in the figure, the lower sheet-like elastic body 6-
If j is damaged due to cracks, warpage, shackle, etc. that occur during punching of the plate material, it can be immediately replaced and used with a sheet-like elastic body of the same thickness.

By using the punch stripper 10 having the stripper plate 6 manufactured by the above method, deformation of the plate material during punching is prevented, and the stripper plate 6
Since there is no gap between the pierced hole and the outer circumferential surface of the pierced punch, the plate material stuck to the punch side wall after punching can be removed by sweeping the stripper plate sufficiently, and the hole in the punched plate material can be removed easily. The occurrence of paris in the peripheral area is prevented. Furthermore, by using a laminated elastic body, there is no need for a complex device equipped with a spring 29 as in the conventional example shown in Fig. 2, and the structure is simple and the pressing force can be easily adjusted. I can do it. In addition, since the sheet-like elastic body is tightly inserted into the outer peripheral surface of the punch, in order to prevent the sheet-like elastic body from falling from the upper mold, the stripper bolt 31 as in the conventional example (Fig. ff 2) is inserted into the stripper. There is no need to attach it to the plate 6, which simplifies the structure and eliminates machining. Further, when the stripper plate is damaged, it is possible to partially replace the sheet-like elastic body, and repair and replacement thereof is easy.

Moreover, in manufacturing it, there is no need to perform machining as in conventional examples, and the installation process of components can be omitted.
Further, it can be easily manufactured by simply punching an elastic body without using a solution or the like.

〔Effect of the invention〕

A stripper plate having a laminated structure of sheet-like elastic bodies is used, and since the elastic bodies are made to protrude by a predetermined amount from the tip of the punch, there is sufficient pressing force to press the plate material, and
The pressing force acts perpendicularly and evenly over the entire surface of the plate, and the plate does not deform during work.

Further, since there is no gap between the piercing hole of the punch stripper and the outer circumferential surface of the piercing punch, there is no occurrence of burrs in the plate material after punching. Furthermore, since the sheet-like elastic body is inserted in close contact with the outer peripheral surface of the punch, the elastic body will not fall from the upper mold. Furthermore, since the sheet-like elastic body has a laminated structure, it is possible to partially remove and replace it at the time of repair or the like.

That is, the present invention has the following effects.

(1) The punch stripper has a simple structure, is easy to manufacture, and saves man-hours.

(2) Deformation of the plate material during drawing is prevented, and occurrence of cracks in the punched plate material is prevented.

(3) When the stripper plate is damaged, it is possible to partially replace the sheet-like elastic body, and repair and replacement are also easy.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a punch stripper according to an embodiment of the manufacturing method of the present invention, and Fig. 2 is a sectional view of a punch stripper according to an embodiment of the manufacturing method of the present invention.
A cross-sectional view of the IJper is shown. 5,26... Punch, 6.28... Stripper plate, 5-a to 6-j... Sheet-like elastic body, 10.27...
・Punch stripper. 1... Upper die 2... Lower die 3... Plate material 4... Die 5... Punch 6... Stripper plate 10... Botch stripper second ring 21... Upper die 22. ...Lower die 23...Die 26...Punch 27...Punch stripper 28...Stripper plate 29...Spring 30...Plate material 31...Stripper bolt

Claims (1)

[Claims] 1. A method for manufacturing a punch stripper used to hold down a plate material when pulling out a piercing punch from the plate material after piercing, the method comprising: punching out at least one sheet-like elastic body with the punch; Inserting the inner peripheral surface of the hole tightly into the outer peripheral surface of the punch, further press-fixing the elastic body to the base of the punch, and then punching out at least one next sheet-like elastic body in the same manner, They are closely inserted into the outer circumferential surface of the punch and overlapped with the first sheet-like elastic body, and by repeating the same operation, the layers are stacked one after another until they extend from the base of the punch to the tip and then protrude a predetermined amount from the tip. A method for manufacturing a punch stripper, characterized in that a stripper plate is a sheet-like elastic body having a laminated structure.