RU1811941C - Method of forming parts of sheet material with use of punch of elastic medium and rigid die and apparatus for performing the method - Google Patents

Description

where f is the coefficient of friction); Qnp is the clamping force obtained by expanding Ft ...

The punch from the elastic medium 1 acts on the workpiece 4 in the direction of the rigid matrix 2. The initial force factor can be the external pressure q or the equivalent force P. The created internal pressure ov in the punch from the elastic medium provides radial and axial deformations of the latter. In the area of contact ab with the surface of the hole in the clamp 3 having a profile F (Z), the resultant force of normal pressure N arises, which creates a force (FTp fN). From the equilibrium condition -FTp Fi, it follows that the force FI is applied to the clamp along the local tangent at point C due to the resultant normal pressure forces N, Decomposition of force Pi gives the clamp force Qrip. Given the desired profile F (Z), with known q or P and the stiffness of the elastomer, they further control the strength of Cp ....

A device for implementing the proposed method comprises a matrix body 5, a punch 6 of elastic medium, a workpiece 7.

The housing 1 of the stamp is placed on the basis of the installation of coax with the barrel and connected to it. A rigid matrix, a clamp, a hole in which is profiled in accordance with the law, control of the clamping force, as well as poop sleep from an elastic medium having a reciprocal profiling of the side surface is placed in the housing. A missile mass moves in the barrel, the kinetic energy of which determines the value of the equivalent dynamic force P applied to the punch from an elastic medium. There are openings in the barrel for air to escape at the time of the impact of the missile mass.

The device operates as follows. In the initial state, the missile mass is fixed in the upper part of the barrel. The stamp is separated from the barrel along the plane of the connector. A preform is laid on the die and covered with a clamp 3 assembled together and a punch of elastic medium. The stamp is then connected to the barrel. Carry out the throwing mass, which is excess air pressure

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acceleration in the barrel to the desired kinetic energy or dynamic force P.

In the lowermost position, the throwing mass strikes the punch from the elastic medium, depositing it, while part of the energy or effort is spent on deforming the workpiece along the matrix, and the other on creating and attaching friction in the pair of the clamp and punch from the elastic medium, the clamp receives the amount of clamping force with the desired law of change. After stamping, the throwing mass rises and locks. The stamp is separated from the barrel, the stamped blank is removed, and the cycle is repeated again.

The present invention is most effective in precision machine and instrument engineering, can provide increased technological efficiency of the method, namely, increased accuracy of the shape and size of the workpiece.

Claims (2)

1. A method of stamping parts from a sheet material with a punch from an elastic medium on a rigid matrix with a clamp, which consists in acting on the workpiece with a punch from an elastic medium in the direction of the rigid matrix and controlling the amount of pressure pressed by the clamp on the peripheral part of the workpiece, from moreover, and in order to expand the field of application of the method by providing the possibility of using it for high-speed stamping, a value of 5 is pressed by pressing the peripheral part of the workpiece They are poured by using radial deformation of the punch from an elastic medium and friction against the counter surface of the clamp. 2. A stamp for stamping parts from a sheet material by a punch from an elastic medium onto a rigid matrix, comprising a rigid matrix, a punch from an elastic medium and a clamp mating with a punch, characterized in that the mating portions of the punch and clamp are made in the form of surfaces forming a profile which is determined in accordance with the law of control of the magnitude of the increase in pressure by pressing the peripheral part of the workpiece. 0 0 5