SU712176A1 - Reversed pressing method - Google Patents

Description

The invention relates to the field of metal forming and relates to a method of reverse stamping sheet blanks mainly in a state of superplasticity.

A known method of reverse stamping parts from sheet blanks by means of liquid or gas pressure, in which the blank is pre-deformed by a rigid liner, after which the liner is retracted and final deformation is carried out in the matrix [1].

The proposed method provides for the deformation of only one workpiece and for its implementation requires additional structural elements-liners, which after preliminary deformation must be removed from the cavity of the matrix.

The aim of the invention is to simplify die tooling and increase process productivity.

For this, two blanks are stamped at the same time, which are positioned one above the other with a gap and are deformed with previously counter-directed forces, using each blank relative to the other as a liner. The final deformation is carried out by applying pressure between previously deformed workpieces.

The drawing schematically shows a device for implementing the proposed method.

An even number of blanks 1 (two in the drawing) are stacked between the matrices 2 and the hollow gasket 3 one above the other and tightly pressed. By otvers10 Tille 4 in the bodies of the matrix 2 and channel 5 in the body liner 3 from the fluid pressure source (liquid or gas) in the cavities of the matrix 2 is created an excess pressure under which the workpiece 1 preliminary ¹⁵ deform Tel'nykh the cavity liner 3, one on the surface of another , thereby fulfilling the role of inserts relative to each other. At this stage of stamping, the flow of the central zones of the workpieces 1, the first ²⁰ of which come into contact with one another, slows down and the zones of the workpieces 1 are most severely deformed, the duration of free buckling of which is maximum. For a stable and controlled process flow, the stamping of blanks 1 of each pair is preferable, i.e., the same dimensions of the blanks 1 and the required parts and the same force parameters of deformation. 30 In order to achieve a minimum of thickness differences3 of parts, it is preferable to deform the semi-finished product to a depth of 0.3-0.4 of the given diameter of the workpieces with the maximum possible filling of the gasket cavity 3 (for parts such as shells of revolution, with the maximum possible length of the generatrix). At the next stage of stamping, the pressure is reversed by means of a pressure source, channel 5 and openings 4, creating an excess in the cavity of the gasket 3, and the resulting semi-finished products are shaped by “turning” in opposite from one another to the final dimensions of the parts. In this case, the central zones of semi-finished products are most intensively deformed, and as a result, high-quality, approximately equal-thickness parts are obtained. After stamping, the matrices 2 are removed from the gasket 3 and the finished parts are removed from the latter.

Claims (1)

Claim A method of reverse stamping parts from sheet blanks with fluid pressure, in which the blank is pre-deformed along the liner in one direction, and then final by turning the resulting 5 semi-finished product in the opposite direction, on the other hand. that, in order to simplify the die tooling and increase the productivity of the process, two blanks are stamped simultaneously, which are placed one above the other with a clearance of 0 and are deformed with previously counter-directed forces, using each blank relative to the other as a liner, and the final deformation 5 is carried out by applying pressure between pre-deformed workpieces. Source of information taken into account during the examination: 1. Pikhtovnikov R.V. New in the technology of stamping production. Kiev, 1961, p. 126 (prototype).