SU994117A1 - Method of electric discharge dressing of abradive discs - Google Patents

Description

Union of Soviet Socialist Republics

USSR State Committee for Inventions and Discoveries

DESCRIPTION OF THE INVENTION

TO AUTHOR'S CERTIFICATE

0. 994117 (61) Additional to author. certificate-wu - (22) Notified on 04.06.80. (21) 2934439 / 25-08 with the addition of application No. i. · (23) Priority -

Published on 7.02B 3. Bulletin No. 5

Date of publication of the description 07.02.83 (51) M.C. ³

23 V 1/10 (53) UDC621.9. 048.

.4.06 (088.8) (72) The inventors

P.G. Matyukha and V.P. Tsokur (71) Applicant /;

Donetsk Order of the Red Banner of Labor Polytechnic Institute -

..... ^ί! (54) METHOD FOR ELECTROEROSIVE EDITING OF ABRASIVE CIRCLES

2

The present invention relates to abrasive processing of materials, in particular grinding, and is intended for dressing diamond abrasive wheels on a metal bond.

The method of electroerosive dressing of circles on a conductive bond is known, in which the electrode-tool rotates at a speed of 300 rpm and the diamond wheel at a speed of 80-100 rpm [1].

The disadvantage of this method is the increased mechanical wear of the electrode due to its grinding with diamond grains.

In addition, grinding the surface of the electrode leads to an increase in the interelectrode gap, which worsens the course of electroerosion processes. As a result, part of the voltage pulses generated at the output of the generator cannot penetrate the interelectrode gap. There are no current pulses in the interelectrode gap and, accordingly, the ligament is not removed. Therefore, editing performance is reduced.

An attempt to reduce the interelectrode gap due to the approach of the electrode of the circle leads to more intensive wear of the electrode due to grinding with diamond grains.

There is also known a method of electro-erosive dressing of circles on a metal bond, in which, in the process of introducing the technological current, the machined circle rotates at a low speed, and the processing electrode 10 is given a high rotation speed [2].

The disadvantage of this method is the mechanical wear of the electric tool, which intensifies with increasing relative. speed. Similarly to the previously degraded flow EDM processes, which reduces the productivity ^m changes.

The aim of the present invention is the elimination of mechanical wear of the electrode without reducing the performance of the dressing.

This goal is achieved by the fact that dressing is carried out at equal linear velocities of the surfaces of the electrode and the circle, the vector of which is directed in the same direction in the interelectrode gap zone.

In this case, the surfaces of the electrode and the circle are circled, maintaining the necessary interelectrode gap, and there is no relative displacement of the surfaces.

The drawing shows a diagram of a device for electroerosive dressing of abrasive wheels by the proposed method.

Pulse generator 1 is installed On a grinding machine, for example, an internal grinding machine, on which a technological connection is provided to the chuck for fixing the electric tool 2 and the grinding head with a circle 3. A pulley 4 with an elastic ring 5 is installed on the grinding head 5), the diameter of which exceeds grinding wheel diameter.

During the editing process, the surface of the elastic ring 5 is brought into contact with the 2 surface of the electrode. The interelectrode gap between the surface of the circle 3 and the tool electrode is set up necessary for electroerosive dressing and the electrode is rotated. Due to the frictional forces between the surface of the elastic element 5 and the electrode, the rotation is transmitted to the spindle with a grinding wheel 3.

The circle rotates in the same direction as the ith electrode-tool, with a speed ^J equal to the speed of the electrode surface. Velocity vectors are directed in one direction. After the supply of 'technological current, the correction takes place. A 3% solution of calcined water can be used as a working medium.

The absence of relative displacement of the electrode surfaces and the circle excludes mechanical wear of the electrode 4. As a result of the absence of grain grinding of the electrode surface, the interelectrode gap does not increase, and almost all generated voltage pulses break through the interelectrode gap, the maximum value of which is determined by the voltage value at the generator output.

Due to the thermal effect of the pulses of electric current in the interelectrode gap, ligament removal will occur. Reducing the performance of dressing due to the lack of mechanical wear of the electrode will not occur.

Claims (1)

Claim The method of electroerosive dressing of abrasive wheels on a metal bond, according to which the power tool and the wheel are rotated and a pulsed technological current is introduced into the dressing zone, so that, in order to exclude mechanical wear of the electrode-tool, the process is carried out at equal linear velocities of the electrode-in surfaces with a grommet and a circle, and their vector in the dressing zone is directed in one direction.