SU1227384A1 - Method of dimensional electrochemical working - Google Patents

Description

The invention relates to electrophysical and electrochemical processing methods, in particular, to a method of dimensional electrochemical processing of large parts.

The purpose of the invention is to improve the processing accuracy due to the fact that the time taken to remove the electrode-tool to the working gap is reduced by the time it takes to charge the double electric layer of the treated surface from the source of the reference voltage — 10 of the tool-type — the dependence of the effective treatment area on

The essence of the proposed method consists of the following title.

During processing, a double layer that occurs at the interface between the surface and the electrolyte that is processed has a certain capacity. Moreover, as the electrode tool penetrates into the workpiece, the machining area increases and, consequently, the integral capacity of the double layer increases. Under the action of the process current 20 and the voltage source, this capacitance is charged to a value determined by the processing conditions. When the electrodes used in cyclic processing circuits are touched, the dependencies of the reference point of the working gap are determined for the basis of which, the capacitance of the double contact time is discharged. Charging electrodes due to double charge

Raff Raeo + P (b),

where REO is the initial processing area; h is the amount of penetration of the electrode tool into the workpiece. Then, the increment of the contact time of the electrodes, caused by the charge of the double layer, is determined.

Lte Te-t „,

and find the coefficient of proportionality between the increment of the contact time of the electrode and the treatment area,

K,

layer, on depth

The metal contact is detected by a measuring circuit, and on its basis a command is created for the dilution of the electrodes.

At the moment of breaking the metal contact, the capacity of the double layer continues to bypass the measuring circuit, thus increasing the duration of the signal of contact of the electrodes formed by it. This, in turn, leads to a change in the starting point of the working gap, and consequently, to an increase in its actual value, the time by which the contact duration increases, is determined by the constant time of the double layer charging circuit, namely its capacity and value. internal resistance of the voltage source.

Thus, the charge time of the double layer of the treated surface is directly

It affects the accuracy of the installation of the gap at a given level by its roll gap, and ultimately - the accuracy of processing. Moreover, with an increase in the area increases the error of processing.

The treatment process according to the proposed method is carried out as follows.

response to the value determined by the time of charge of the double layer of the treated surface from the source of voltage. The result of this is an increase in the accuracy of processing the cavities of dies of large areas.

Compiled by R. Nnmatulin

Tehred I. Veres Corrector L. Patay

Circulation 1001 Subscription

VNIIPI USSR State Committee

for inventions and discoveries

113035, Moscow, Zh-35, Raushsk nab. 4/5

Branch PPP "Patent, Uzhgorod, st. Project, 4

Before the treatment, the duration of the contact between the dry surfaces of the electrode tool and the workpiece (m) is measured. This makes it possible to evaluate the effect of the inertia and drive errors and, to some extent, the non-rigidity of the SIZE system on the contact time of the electrodes. After that, the duration of contact of the electrodes in the electrolyte medium (t) is determined, and on the basis of the analysis of the drawings of the workpiece and the electrical ingot

 the basis of which determines the dependence of the increment of the duration of contact of the electrodes, caused by the charge

Raff Raeo + P (b),

where REO is the initial processing area; h is the amount of penetration of the electrode tool into the workpiece. Then, the increment of the contact time of the electrodes, caused by the charge of the double layer, is determined.

Lte Te-t „,

and find the coefficient of proportionality between the increment of the contact time of the electrode and the treatment area,

K,

 the basis of which determines the dependence of the increment of the duration of contact of the electrodes, caused by the charge

layer, on depth

)

In the course of processing, the removal time for a given working gap of 1 ft. Back, calculated on the basis of ensuring the required machining accuracy, as the electrode tool penetrates into the workpiece is corrected by the increment value

touch y.T. „p, t. e.

. OT6 t otv-ZChD Dt e nor

or set the size of the working gap

Syct. 5ead-Utekor,

where 5zad. - the initially specified design value of the working gap; V - tap speed of the electrochemical machine.

Thus, in the course of processing, the value of the working

response to the value determined by the time of charge of the double layer of the treated surface from the source of voltage. The result of this is an increase in the accuracy of processing the cavities of dies of large areas.

Claims (1)

METHOD OF DIMENSIONAL ELECTROCHEMICAL TREATMENT with periodic contact of the electrodes and counting of the working gap at the moment of breaking of their contact, fixed using a reference voltage source, characterized in that, in order to increase the accuracy of processing large parts, the time of removal of the electrode-tool to the working gap is reduced by time charge of the double electric layer of the treated surface from the source of the reference voltage. Go go Fo oo