SU1371816A1 - Arrangement for electric discharge cutting - Google Patents

Description

(21) 3949215 / 31-08

(22) 09/06/85

(46) 07.02.88. Bul № 5

(71) Moscow Institute of Electronic Engineering

(72) I.P.Moskvina

(53) 621.9.048.4.08 (088.8)

(56) Patent of the USSR No. 847902, cl. B 23 N 7/02, 1978.

(54) DEVICE FOR ELECTRO-EROZION CUTTING

(57) The invention relates to electrophysical and electrochemical processing methods, in particular to EDM cutting. The aim of the invention is to improve the machining accuracy by eliminating the loss of the central part of the workpiece after cutting. The workpiece 2 is installed on the table 1. The electrode wire 10 is brought into the technological opening of the workpiece 2 and installed in the guides 11 of the bracket 3. The oil is fed into the cavity of the hydraulic cylinder 5. At the same time, the piston 7 moves upward, compressing the return spring 6. The plate 8 presses to the bottom surface of the workpiece 2 ball bearings 9. Processing of the workpiece 2 is carried out with the support of the central part of the workpiece 2 plate 8. 1 sludge.

WITH

€

eleven

(L

SAE

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ABOUT)

The invention relates to electrophysical and electrochemical processing methods, in particular, to devices for electroerosive cutting with an electrode wire.

The purpose of the invention is to improve the accuracy of processing.

The drawing shows the proposed device.

The device comprises a table 1 with a workpiece 2 fixed on it, a bracket 3, a workpiece support mechanism 4 made in the form of a hydraulic cylinder 5 fixed on a bracket 3. The hydraulic cylinder 5 is equipped with a return spring 6. The piston 7 of the hydraulic cylinder 5 is equipped with a plate 8 facing the lower surface of the workpiece 2 The plate 8 is equipped with ball bearings 9. Electrode-wire 10 is placed on the bracket 3 in the guides 11.

The device works as follows.

The blank 2 is placed on the table 1. The electrode wire 10 is brought into the technological opening of the blank 2 and is installed in the guides 1 1 of the bracket 3.

The oil is fed into the cavity of the hydraulic cylinder 5. At the same time, the piston 7 moves upward, compressing the return spring 6. The plate B is pressed against the bottom surface of the workpiece 2 by ball bearings 9.

The oil pressure in the hydraulic cylinder is chosen according to the ratio

 Wg

. P, G - S force developed by the hydraulic cylinder 5;

force developed by the spring 6;

the weight of the fluid displaced;

weight of the cut blank; piston area

five

0

0

five

five

The workpiece 2 is processed with the support of the central, cut out part of the workpiece 2 by the slab 8. This prevents the central part of the workpiece from falling out after cutting a closed contour in it and improves the machining accuracy, since the central, removable part of the workpiece does not bend or break the jumper connecting the removable part with the workpiece at the time of the end of processing along the contour.

Claims (1)

Invention Formula A device for electroerosive cutting, containing a bracket with electrode-wire guide, a table for securing the workpiece and a support mechanism for the workpiece, while the bracket and the table are installed with the possibility of two-coordinate relative displacements, characterized in that as a hydraulic cylinder with a return spring, while the hydraulic cylinder is attached to the bracket, and its piston is provided with a support plate, designed to accommodate the workpiece.