SU682306A1 - Die unit with change pack for working sheet materials - Google Patents

Description

one

This invention relates to a cold snap forming tooling.

Group blocks are known in the interchangeable package arrangement, consisting of two independent parts, a fixed block and a replaceable batch stamp.

The permanent unit is mounted from permanent or universal elements - the upper and lower plates, guiding them, their columns and sleeves, the shank, as well as the ejector, buffer and fastening devices.

The replaceable batch stamp is assembled from special parts for technological purposes - upper and lower plates, a punch, a die, a punch-die.

The disadvantages of the known structures are their complex structure and the lack of accuracy in centering the punches and dies. Insufficient centering accuracy is caused by the complexity of the block and package, since many intermediate parts (plates, columns, bushings, studs, etc.) are involved in centering, and the error of each part affects the centering. With inaccurate centering, the gap between the punch and the die is unevenly distributed around the circumference, which degrades the quality of the parts being stamped and leads to rapid wear of the cutting edges of the punches and dies.

To improve the centering accuracy, the blocks are equipped with ball guides or adjustable sleeves and floating shanks, and bags with guide columns 2.

However, this further complicates the design of the blocks and packages.

A block with a replaceable bag for processing sheet material is known, comprising a body, in one of the parts of which a puller is attached, rigidly connected to the body, and a punch, spring-loaded relative to the directional puller {3. There are no means in this block for combining several operations, for example, to obtain parts such as washers. For the purpose of combining operations such as punching and cutting, mainly in the manufacture of washers, the described die block is provided with an additional punch, telescopically connected to the punch, spring-loaded relative to it in axial

direction and directed by him, and an additional matrix and ejector, spring-loaded in the axial direction relative to the matrix and guided by it and telescopically connected between

by myself.

The drawing shows the described block in longitudinal section.

The block includes a housing 1, upper 2 and lower 3 plugs. The inner cylindrical surface of the housing 1 serves for centering, and the plugs 2 and 3 for fastening the upper and lower parts of the bag.

The upper part of the bag contains a punching punch 4, a cutting punch 5, a stripper 6, and elastic elements 7 and 8, spring-loaded, and punches 4 and 5 axially with respect to the stripper 6. The punches 4 and 5 are telescopically guided and guided by the stripper 6.

The lower part of the bag includes a waste ejector 9, a punching matrix 10, a cutting matrix 11 and an elastic element 12. The matrix 10 and an ejector 9 are telescopically connected to each other, the elastic element 12 biases them in the axial direction relative to the matrix 11, which serves to guide them.

Works stamp as follows.

Through the window 13 of the housing 1, the workpiece 14 is inserted and force is applied to the punch 4. Moving down, the punches 4 and 5 pierce and cut the part. The pusher 9 prevents the parts from being worn out when stamping soft metals.

When the force is removed from the punch 4, the elastic elements 7, 8 and 12 return all the parts to their original position. At this time, the ejector 9 removes waste from the piercing die 10, the latter pushes the part out of the cutting die I, the cutting pierce 5 removes the washer from the penetration pier 4, and the puller 6 removes the strip from the die 5.

The position of the workpiece is fixed by the guide bars 15 and the step support 16.

To switch to the manufacture of washers of other sizes, it is necessary to remove plugs 2 and 3 and replace the bag.

Since the centering of the upper and lower parts of the package takes place directly by the working parts over the surface of the block body processed from one installation, high accuracy is ensured.

centering and directing the punches relative to the dies, as a result of which parts with a high accuracy class can be manufactured.

The simplicity of the block and package design makes it possible to manufacture them at small repair plants that are not able to produce stamps with guide columns, and apply them to making sealing gaskets even in the absence of pressing equipment (stamped with a hammer or sledge hammer).

Claims (3)

Invention Formula Stamp unit with replaceable sheet processing package containing body, in one of which parts a guide puller, rigidly connected to the housing, and a punch, spring-loaded relative to the guide puller, placed telescopically and connected to the actuator displacement, and in another part a matrix rigidly connected to the housing, characterized in that Combining operations such as punching and punching mainly in the manufacture of washers, it is equipped with an additional punch, telescopically connected with the punch, which is spring-loaded from it axially and guided by it, and with an additional matrix and a pusher, which is axially spring-loaded relative to the die and guided by it and telescopically interconnected. Sources of information taken into account in the examination 1- A. Foygelman. Album of universal metal structures, blocks, and assemblies for cold forming. M. "Engineering, 1970, p. 99-100, FIG. 20.08. 2. Romanovsky V.P. Handbook of cold stamping. L., “Mechanical Engineering, 1971, p. 442. 3. USSR author's certificate number 498070, cl. B 21D 28/14, 1974.