SU1315183A1 - Material for tool electrode for electrochemical/mechanical polishing - Google Patents

Abstract

The invention relates to the field of combined electrochemical machining. The aim of the invention is to increase the productivity of the treatment and reduce the roughness of the surface to be treated. The goal is achieved by the addition of activated carbon, ground talc and pulverbeacite to the electrode-tool material based on chopped wood and water-soluble salt, and the components are taken in the following ratio, May. %: chopped wood 30-35; water soluble salt 10-15; activated carbon 20-25; ground talc 20-23; pulverbakelite 10-12. 2 tab.

Description

one

The invention relates to the field of combined electro-mechanical processing.

The purpose of the invention is to achieve the processing performance and reduce the surface roughness.

This goal is achieved by introducing into the composition of the material an additional active of eozak coal, ground talc and pulverbachelitis.

The essence of the invention is that reducing the roughness of the treated surface and increasing the productivity of the process is achieved by using components whose combination in a selected percentage ratio ensures the formation and destruction of only thin oxide films and adsorption layers mainly on the tops of the irregularities.

An increase in the productivity of the polishing process is achieved due to the simultaneous electrochemical and abrasive effect on the surface being treated with improved removal of anodic reaction products from the treatment zone due to their absorption by activated carbon located in the surface layer of the tool electrode. Activated carbon also provides the same conductivity over the entire surface of the electrode tool. Abrasive polishing properties of the electrode-tool gives ground grind

Pulverbakelite is a binder that imparts electrode-inst

Increase in initial roughness from 0.02 to 1.6

0.01 0.05 0.010

3 2

after pressing and sintering, the required mechanical strength is required.

In order to reveal the synergistic effect, electrodes-instruments were tested with the following component content, wt%:

I.Drevesin.a crushed 30-35 Water soluble

salt 10-15

Pulverbakelite 60-50

II.Wood crushed 30-35 Water soluble

salt 10-15

Activated carbon20-25

Pulverbakelite 40-25

III. Wood shredded 30-35

Water soluble salt 10-15

Ground talc 20-23 Pulverbakelite 40-25

IV.Wood crushed 30-35 Water soluble

salt15-10

Activated

coal 20-25

Ground talc 23-20 Pulverbakelit. 10-12 Tests were carried out at a working voltage of 2-3 V, and the salt of sodium phosphate acid monosubstituted was used as a water-soluble salt.

The test results are shown in table.1 ..

Table 1

0.05 0.25 0.2 0.62

313

It can be seen from the tests that the pre- pared composition of the electrode tool provides for polishing current-carrying materials to reduce the roughness of the treated surface to a CD of 0.010 µm and increase the productivity of the polishing process to 0.62 µm / min.

Tested boundary and average composition of the components of the electrode-tools, wt.%:

I. Wood shredded 30 Water soluble

salt15

Activated

coal o

Ground talc 23

Pulverbakelite IO

II.Wood crushed 35 Water soluble

salt10

Activated Carbon25

Ground talc 20 Pulverbakelite 1 III. Wood milled 32, 5 Water-soluble salt 2.5 Activated carbon 22.5 Ground talc 22.5 Pulverbakelite 12 The results of the tests on the boundary and average compositions of the components of the tool electrode are listed in Table 2.

Table2 40

35 45

From the tests it is clear that the change in the percentage of components

834

the electrode tool in the boundary limits does not lead to significant changes in the roughness of the treated surface and the performance of the polishing process.

The polishing process is carried out as follows. The treated surface is moistened with a 50% aqueous solution of ethylene glycol. The positive pole of the current source is connected to the part, the negative pole is connected to the tool electrode. The polishing process is carried out by moving the rotating electrode tool over the surface to be treated. with a clamping force of 0.2-0.8 kgf / cm.

The manufacture of the tool electrode is carried out in the following sequence. The crushed wood is impregnated with a concentrated electrolyte solution and dried. Dried shredded wood is thoroughly mixed with activated charcoal, ground talc and pulverbakelite.

Thoroughly mixed mass is poured into a mold made according to the shape of the required electrode-tool profile, pressed and heated to. After pressing baking, the working surfaces of the electrode tool are opened by known methods. .

0

Claims (1)

Invention Formula 5 The material of the electrode-tool for electrochemical polishing based on chopped wood and water-soluble salt, characterized in that, in order to improve the processing performance and reduce the roughness of the surface to be treated, activated carbon, ground talc and Johl are added to its composition, and 5 vy you in the following ratio, wt.%: Shredded wood Water soluble salt Activated coal Ground talc Pulverbakelit 0 30-35 10-15 20-25 20-23 10-12