SU724247A2 - Method of finishing cutting-out of parts from sheet stock - Google Patents

Description

one

The invention relates to methods for the processing of sheet materials by pressure and can be used when cutting parts from low-plastic materials with a material thickness of more than 5-6 mm.

There is a method of fine cutting of parts from sheet materials, in which the workpiece is cut with an allowance, and then the stock is cut and compressed in the cutting process in thickness.

The disadvantage of this method is sparks; 5 the insertion of a strip from which parts are cut.

According to the main author. St. No. 206522, there is a known method of finishing cutting of parts from sheet materials, in that the workpiece is cut with an allowance, after cutting, it is compressed around the perimeter, and then the stock is cut.

The disadvantage of this method is the formation of a rough cleavage zone when producing parts from low-plastic materials and a material thickness of more than 5-6 mm.

The aim of the invention is to improve the quality of the cut surface in the production of parts.

This goal is achieved by the fact that in the process of trimming the allowance it is simultaneously compressed in thickness and perimeter.

The proposed method is illustrated.

2

in the drawing (on the left is shown a cut-out blank with an allowance at the moment of compression along the perimeter, on the right - a part is ready after separation of the allowance and a separated allowance at the moment of its compression along the perimeter and height).

The method is carried out as follows.

The processed material 1 is placed on the cutting matrix 2 and, by acting on it with a punch 3, the workpiece is cut down with an allowance. Then the remaining allowance 4 is compressed around the perimeter. For this, the workpiece is pushed by the punch 3 through the hole of the die 2, made in the form of a truncated cone, tapering in the direction of the working movement of the punch 3. At the moment when the workpiece comes into contact with the stripping matrix 5, installed under the cutting die 2, the process of trimming the start-up begins. At the same time, the allowance for cutting continues to compress around the perimeter, for which they continue to act on it by the conical surface of the die matrix. In addition, during the trimming period, the allowance is compressed in thickness, for which the punch 3 is made with two steps (a step with a smaller cross section that allows this step to be inserted into the hole of the wiper matrix 5, and a step with a larger cross section which can only enter. -in hole die 2) ,. and affect the seam allowance of a larger step. As a result, the separation of the allowance 4 occurs under conditions of all-round compression, which ensures the formation of a clean cut surface on the part 6.

The use of the proposed method of finishing cutting provides, in comparison with the known, the following advantages: the possibility of finishing cutting of parts from thick sheets; ensuring a high-quality cut regardless of the dimensions of the parts being cut and the material of the workpiece; simplifying the implementation of the method and improving the stability of the cut-off parts; the possibility of finishing cutting when sequentially stamping from a strip blank.

In addition, the use of the method provides an extension of the possibilities of fair cutting without increasing the technological jumpers in comparison with the ooo cutting. When applying the method for cutting one part of an automatic washing machine, the economic effect will be more than 15 thousand rubles. in year.

Claims (2)

Invention Formula Method of finishing cutting of parts from sheet materials, according to ed. St. No. 206522, characterized in that, in order to improve the quality of the cut surface, obtaining parts from low-plastic materials and a material thickness of more than 5 to 6 mm, in the process of trimming allowance, it is simultaneously compressed in thickness and perimeter. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 613842, cl. At 21D 28/16, 01/19/76. 2. USSR author's certificate No. 206522, cl. B 21D 28/02, 10.05.66 (prototype).