JPH06142784A - Method for working joint in punch press - Google Patents

Abstract

PURPOSE:To reduce a cutting man-hour for a joint working after a product is punched and to provide a joint working method which reduces labor required for mending the product without increasing the working time even for a thick stock or a large article. CONSTITUTION:A punch 2 formed with a shear angle theta on the lower surface and a die 1 in which an elastic material 3 such as an urethane rubber is packed inside the groove 1a are used, a die clearance between the punch 2 and the die 1 is set to be zero or negative, and the end part of an product 7 side of a joint 9 is punched. In this case, the punching depth is so decided that the joint 9 is not completely sheared.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention punches a product by a punch press process using a turret punch press or the like to leave a joint for connecting a product and a raw material, and then processes the remaining joint. It is about the method.

[0002]

2. Description of the Related Art Conventionally, in order to obtain a product having a desired shape by using a punch press such as a turret punch press, a sketch material cut in advance according to the outer dimensions of the product is purchased and the edge portion is cut by a predetermined amount. Although it may be processed, in general, as shown in FIG.
As shown in (a), a method of cutting a large number of products 102 from a material (standard size material) 101 at the same time (so-called a large number of pieces) is used. In the case of performing such a large number of pieces, normally, in order to prevent each product 102 from coming off the material until the processing of all the products in the material 101 is completed,
Micro joint 103 or wire joint 10
The material 101 and the product 102 are connected to each other by a thin cross-shaped portion 4 (see FIGS. 7B and 7C). These micro joints 103 and wire joints 104 are mainly manually cut in a post process by using a nipper or the like. Also, especially the wire joint 10
With respect to No. 4, since many extra protrusions called so-called “whiskers” and “burrs” remain on the product 102 side even after cutting, these protrusions were removed using a grinder.

[0003]

By the way, when a thick plate product having a weight of, for example, several tens of kilograms is processed using the punch press, or a large product having a side length of, for example, several hundred millimeters is processed. In this case, it is necessary to secure sufficient rigidity of the joint so that the joint does not come off during the processing, and therefore the crosspiece width of the joint is made large. However, when a joint having such a high rigidity is used, there is a problem in that the joint removing work in the subsequent step is not easy and a large number of man-hours are required. In addition, in order to deal with such a problem, it is possible to reduce the rigidity of the joint as much as possible and to gently handle the material at the time of processing, but in this case it takes a lot of processing time. Inevitably, a reduction in processing efficiency is unavoidable.

The micro joint is shown in FIG.
As shown in (b), the corners are provided only on the corners of the product, and for example, for products that cannot be micro-jointed, such as the rounded corners, a wire joint is used. Many will be used. However,
As mentioned above, this wire joint has many protrusions such as'whiskers' left on the product side after cutting as described above, so it is necessary to perform maintenance work to remove these protrusions in the subsequent process, which requires a lot of labor. There was also a problem that it required.

The present invention has been made to solve the above-mentioned problems, and reduces the number of joint cutting steps after punching a product, reduces the labor required for caring for the product, and increases the thickness of the product. An object of the present invention is to provide a joint processing method in punch press processing that does not increase the processing time even for products.

[0006]

A joint processing method in punch press working according to the present invention is a method for punching a product after punching the product with a joint connecting the product and the raw material left. And a die having a shear angle formed on the lower surface and a die in which an elastic material is embedded in the groove, and the die clearance between the punch and the die is set to zero or negative. It is characterized in that the product side end of the joint is punched by the punch and the die to a depth at which the shearing of the joint is not completely finished.

[0007]

[Operation] A work punched in a state where a joint is left between the product and the raw material by the punch press working has an elastic material in which the end of the joint on the product side is embedded in the die and the groove of the die. It is placed on the die so that it is located at the boundary line between the punch and the die, and in that state, the tip of the punch with the shear angle formed on the lower surface is located at the end of the joint on the product side To be done. At that time, the die clearance between the punch and the die is set to zero or negative, and the bottom dead center of the punch is set so that the shearing of the joint is not completely finished. Thus, the product side end of the joint is in a state in which most of the thickness of the joint is cut. Therefore, the end of the joint on the product side can be easily cut by merely hitting the workpiece thus processed from above with a hammer, for example, so that a product having a minimal protrusion can be obtained.

[0008]

EXAMPLE A concrete example of a joint processing method in punch press processing according to the present invention will be described with reference to the drawings. FIG. 1 shows a sectional view of a joint processing apparatus according to an embodiment of the present invention. As shown in the drawing, the joint processing apparatus of this embodiment includes a die 1 mounted on a fixed horizontal table, a die 1 arranged above the die 1 and facing the die 1, and a drive mechanism (not shown). And a punch 2 that is driven up and down by.

A groove 1a is formed in the center of the upper surface of the die 1, and an elastic material 3 such as urethane rubber is embedded in the groove 1a such that the upper portion thereof is slightly projected from the upper surface of the die 1. ing. Further, the punch 2 has a tip portion formed in a rectangular cross section as shown in FIG. 2, and a shear angle θ is attached to the tip portion so that the punch 2 can be moved up and down along the guide 4. It has become. Here, a plate retainer 5 for retaining a later-described work 6 during processing is fixed to the inside of the lower end of the guide 4.

As shown in FIG. 3, the die 1 is
The positions of the die 1 and the punch 2 are adjusted so that the mold clearance c between the punch 1 and the punch 2 becomes zero or a negative clearance. Further, as shown in FIG. 4, the stroke of the punch 2 is set such that the bottom dead center is slightly above the upper surface of the die 1 and the depth at which the shearing of the work 6 is not completely finished by the lowering of the punch 2. Has been adjusted to The gap between the tip of the punch 2 and the upper surface of the die 1 at the bottom dead center of the punch 2 is set to, for example, about 30 to 40% of the plate thickness of the work 6.

With the above-mentioned structure, the product 7 and the material (punch residue) are punch-pressed.
The workpiece 6 that has been punched with the joint 9 remaining between the
The die 1 is placed on the die 1 so as to be positioned at the boundary line between the die 1 and the elastic material 3 embedded in the groove 1a of the die 1, and in that state, the punch 2 completes shearing of the joint 9. It is lowered to the depth position (see FIG. 4). During this processing, the periphery of the processed portion of the work 6 is fixed by the plate retainer 5.

When the punch 2 is lowered in this way, the end of the joint 9 on the product 7 side enters the groove 1a of the die 1 while contracting the elastic material 3, and the product-side end is largely cut off. It will be in the state of being. After that, when the punch 2 is raised, the work 6 is pushed up from the die 1 by the restoring force of the elastic material 3 and easily discharged, and a processed product as shown in FIG. 5 is obtained. When this processed product is hit from above with a hammer, for example, in a later step, a thin portion at the boundary between the product 7 and the joint 9 is cracked, and as shown in FIG. Separated into
A product having almost no protrusions called so-called "beard" or "burr" on the product 7 side can be obtained. In addition, in FIG.
The two-dot chain line shows the state immediately after processing by the joint processing apparatus of this embodiment, and the solid line shows the state in which the workpiece 7 is subsequently hit with a hammer to separate the product 7 and the joint 9.

[0013]

EFFECTS OF THE INVENTION Since the present invention is configured as described above, a product having a shape in which only wire joints can be attached leaves almost no extra protruding portion called so-called "beard" or "burr". In addition, the product can be easily taken out, the man-hour required for cutting the joint can be significantly reduced, and the labor required for caring for the product, such as removing the protruding portion by the grinder after cutting, can be reduced. Further, since a wire joint having sufficient rigidity can be used, punch press processing can be performed accurately and at high speed even for thick products and large products.

[Brief description of drawings]

FIG. 1 is a sectional view of a joint processing apparatus according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an enlarged view of part B in FIG.

FIG. 4 is an explanatory view of a processing state by the joint processing device according to the embodiment of the present invention.

FIG. 5 is a perspective view of a processed product processed by the joint processing apparatus according to the embodiment of the present invention.

FIG. 6 is an explanatory view showing a processed product processed by the joint processing apparatus according to the embodiment of the present invention with the joint removed.

FIG. 7 is an explanatory view of a conventional multi-piece picking and a micro joint and a wire joint.

[Explanation of symbols]

 1 Die 2 Punch 3 Elastic material 6 Work 7 Product 8 Material 9 Joint

Claims (1)

[Claims] 1. A method of punching a product to leave a joint connecting a product and a raw material by punch press processing, and then working the remaining joint, wherein a shear angle is formed on the lower surface. A punch and a die in which an elastic material is embedded in the groove are used, and the die clearance between the punch and the die is set to zero or negative, and the end of the joint on the product side is set by the punch and the die. A joint processing method in punch press processing, which comprises punching to a depth at which shearing of the joint is not completely finished.