SU1121115A1 - Device for pulsed electrochemical machining - Google Patents

Abstract

A DEVICE FOR PULSE ELECTROCHEMICAL TREATMENT, containing a chamber, one of the walls of which is made in the form of a membrane, is Electro-instruct. for a part related to a vibrating electrode holder, characterized in that, in order to simplify the design of the power sources by using for the pulsed electrochemical processing of the power sources of direct current, a conductor is installed on the movable part of the electrode holder and under its end parallel there is a second conductive cable washer fixed on the fixed part of the chamber and connected to the negative pole of the dc source.

Description

The invention relates to electrophysical and electrochemical processing methods, in particular to a device for pulsed electrochemical processing of bulky dies and molds using direct current sources.

A device for electrochemical processing is known, comprising a working chamber connected with an interelectrode gap by means of a pipeline, one of the chamber walls being made in the form of a membrane rigidly connected to the electrode holder. When the latter moves upward, the membrane bends inside the chamber, thereby reducing its volume. A portion of the electrolyte is displaced through the pipeline into the interelectrode gap, washing it intensively and removing processing products from it. When the electrode holder moves down, the membrane bends outward, increasing the volume of the chamber. The increase in volume is filled with a portion of the electrolyte from the hydraulic system of the machine £ 1].

i However, the use of this device | assumes that the use of special switching power supplies for generating pulses (bursts of pulses) of the required shape and synchronous shutdown of these pulses with an increase in the gap to create conditions for intensive washing of the MEE The aim of the invention is to simplify the design of power supplies by using for switching electrochemical processing of simple DC power supplies. I This goal is achieved by the fact that in the device for pulsed electrochemical processing containing a chamber, one of the walls of which is made in the form of a membrane rigidly connected to a vibrating electrode holder, a conductive washer is installed in the chamber on the moving part of the electrode holder so that under its end facing to the feed direction, there is a second conductive washer rigidly fixed to the fixed part of the camera and connected to the negative pole of the DC source, t

To increase the reliability of operation (to avoid etching of the conductive washer connected to the negative pole). This washer is made of electronegative material, such as carbon graphite. The manufacture of this washer from another conductive material, such as steel, copper, etc., is unacceptable, since it will be subject to anodic dissolution due to the presence of all factors of the electrochemical cell, i.e. electrodes, potential and electrolyte between them.

The presence of conductive washers in the filled chamber allows you to change the resistance of the gap formed between the ends of these washers when changing the size of the electrolyte layer.

When the electrode holder moves upward, the gap between the washers increases, which, increasing the thickness of the electrolyte layer in this gap, changes the resistance.

The drawing shows the proposed device.

The device contains a conductive washer 1 installed in a filled chamber 2 on the movable part of the electrode holder 3. Under the end of the washer 1, facing the feed direction, there is a second conductive washer 4, rigidly mounted on the housing 5. For electrical isolation of the washer 4 from the housing 5, insulators 6 .

The device operates as follows.

; When the electrode-tool vibrates, for example, when operating in a pulsed-cyclic mode, the gap between the ends of the washers synchronously

I the holder of the layer th through the chamber 2, and the electrical resistance of this layer. When the electrode holder 3 moves down, which corresponds to the EI installer for the working gap with the workpiece, the gap between the washers 1 and 4, respectively, decreases, decreasing the resistance in the circuit and thereby increasing the working technological current.

When the electrode holder 3 moves upward at the end of a single processing cycle, the gap between washers 1 and 4 synchronously increases, increasing 45 ^ resistance and reducing the technological current in the working gap, creating conditions for intensive washing of the interelectrode gap.

and 4 also changes with vibrations of electrode 3. In this case, the thickness of the electrolyte changes, consequently pumped,

The presence in the device of conductive washers 1 and 2 with a gap between them, synchronously changing with the movement of the electrode holder 3, also allows you to synchronously change the resistance in the circuit, thereby changing the strength of the process current.

'This technical solution allows you to abandon the special system in the power source that commutes or generates the pulses of the technological current, and this, in turn, allows the use of simple and cheap DC power supplies for pulsed ECHO, for example, such as IPTU, VAK, VKG and etc.

Claims (1)

DEVICE FOR PULSE ELECTROCHEMICAL PROCESSING, containing a chamber, one of the walls of which is made in the form of a membrane, gesture 1 = cl The electrode is imstrun. to the part 0 -> - related to the vibrating electrode holder, which is connected with the fact that, in order to simplify, the design of the power sources due to the use of direct current power sources for pulsed electrochemical processing, a chamber is mounted on the movable part of the electrode holder a conductive washer, under the end of which a second conductive washer is located, rigidly fixed to the fixed part of the chamber and connected to the negative pole of the DC source.