SU919785A1 - Apparatus for forming sheet blanks by fluid pressure - Google Patents

Description

(5) DEVICE FOR STACKPING SHEET PLUGS BY PRESSURE. MEDIA

one

The invention relates to devices for stamping sheet blanks with liquid and can be used in mechanical engineering in the manufacture of aircraft and other products from sheet blanks.

A device is known for punching sheet blanks with the pressure of a liquid medium containing a hollow body, into which working medium is supplied under pressure from an external source, and a spring ring and matrix installed on the body. The casing is fitted with an insert of a mushroom shape that can move in a direction perpendicular to the surface of the workpiece. During the drawing process, the insert moves simultaneously with the workpiece while maintaining the gap between their surfaces, into which the liquid 1 is fed.

However, in the known device, the deformation is carried out under direct pressure of the fluid.

And the presence of fluid between the insert and the workpiece ensures their free relative movement, which leads to significant wall thinning along the entire forming of the stamped workpiece.

Closest to the invention to the technical essence and the achieved result is a device for forming pressure working medium

10 contains a matrix, the bottom part of which is made in the form of an insert, connected to the drive of the axial movement of the clamp and the chamber, into the cavity of which the working medium 2 is fed.

IS

The known device blocks the danger zone of the workpiece and eliminates the possibility of its excessive thinning in the hazardous (central) zone, but does not eliminate the unevenness

20 thinning the walls of the resulting product.

Claims (2)

The aim of the invention was to reduce the irregularity of thinning and improve the quality of the product. 3 This goal is achieved by the fact that the device for stamping sheet blanks by medium pressure, containing the matrix of the bottom part of which is made in the form of an insert connected to the axial displacement drive, the press and the chamber whose cavity communicates with the source of supplying the working medium. control, pressing force, a punch with a profile of the working surface corresponding to the profile of the bottom part of the die and a power cylinder, the piston rod of which is connected to the pier on one side and equipped with a copier on the other side with clamping force control system. The drawing shows the proposed device, a longitudinal section. The device contains a frame 1, in which a chamber 2 is mounted and a cylinder 3, the piston of which is connected to the punch 4 on one side and a copier 5 on the other. A pressure ring 6 is installed in the chamber. These elements comprise the lower part of the device. For The lower part of the upper part is equipped with a bayonet lock in the form of a ring 7 of the hydraulic actuator 8 and the closing mechanism 9. In the lower part of the device, there is a pressure control hydraulic system with a regulating member 10. The upper part of the device contains a matrix 11, the bottom part of which is designed as an insert 12 associated with the drive of its axial movement, representing the power cylinder 13. The workpiece 1 is located between the pressure ring 6 and the matrix 11. The device operates as follows. The workpiece 1A set on the clamp b and center; The outer part of the matrix 11 is removed from the housing of the chamber 2 by the closing mechanism 9 and locked with a bayonet. the lock .7 by means of the hydraulic actuator 8. In the cavity of the cylinders 3 and 13, the fluid pressure is applied as a result of this, the central portion of the workpiece is formed and blocked by the moving part of the dies 12 and the punch k. Then, the working pressure is supplied to the cavity of chamber 2 and the product is stretched. At the same time, the copier 5 fixed on the rod of the power cylinder 3 moves and acts on the regulator 54 10, which changes the pressure under the diaphragm in a defined, predetermined mode. This ensures the optimum pressing force of the flange part of the workpiece. After the extrusion process is completed, the working fluid is drained into the tank, the punch is retracted, the bayonet lock 7 is opened and the matrix 11 is retracted from the chamber 2 body. The extruded product is removed from the matrix when the insert 12 is moved by applying pressure of the liquid to the cavity of the power cylinder 13 Advantage device consists in the fact that blocking the central part of the workpiece by moving the middle part of the matrix and the punch ensures the occurrence of friction forces on the clamping over This prevents the flow of metal in this zone and helps to reduce thinning. The presence of double-sided clamping of the central section of the workpiece completely eliminates unstable movement of the flange, eliminating the defective of products through the one-sided tightening of the flange. In addition, stamping products with an optimal, variable by the force of the clamp helps reduce wall thinning in the free and peripheral parts of the workpiece 2-4 times.,. Apparatus of the Invention Forming sheet blanks with a medium pressure comprising a matrix, the bottom part of which is made as an insert associated with an axial displacement drive, a pressure and a chamber whose cavity is connected to a source of supply of the working medium, characterized in products by reducing the thickness variation, it is equipped with a clamping force control system installed in the cavity of the hyaHCOHOM chamber with the profile of the working surface corresponding to the profile of the bottom part of the matrix, and core, the piston rod of which one storony.sv coupled to the punch and, on the other hand is provided with a cam, communication zan5919785 with the force control system 1. USSR copyright certificate .. If 555948, cl. B 21 D 6/02, 21.07.75 .. Sources of information, №, cl. In 21 D 26/02, 15-12.75 taken into account in the examination of s (prototype). 2. USSR author's certificate