RU1808550C - Electrochemical machining device - Google Patents

Abstract

Usage: for electrochemical processing of sheet blanks and parts of a flat and three-dimensional shape from one or two sides of the part at the same time. SUMMARY OF THE INVENTION: fixed electrodes, the main box 5 and the additional mesh 8, mounted at a predetermined distance from the surface to be treated 2 and an elastic dielectric strip 3 with grooves 4 in the shape of the processed surface sections provide high precision machining with good surface quality. The device is equipped with a system for supplying and removing electrolyte and dielectric baffles 11 between the primary and secondary electrodes. 3 ill.

Description

The invention relates to means for electrochemical processing of metals, in particular to devices for electrochemical processing of sheet parts.

The aim of the invention is the expansion of technological capabilities achieved by stabilizing the anodic dissolution process in all parts of the workpiece surface.

The goal is achieved in that the device for electrochemical processing, comprising a chamber, inside which are fixed electrodes, on the working surface of which holes are made for supplying electrolyte to the treatment zone, elastic dielectric gasket, seals, collectors for supplying and removing electrolyte, as follows: a mesh of conductive material is attached to the end surface of the chamber of the equidistant machined surface, which is with an additional electrode, and in of the space between the working surface of the main electrode and the grid mounted partitions of dielectric material, the elastic dielectric liner attached to the perimeter of the end surface of the chamber is provided with embossments in the form of processed portions of the surface and is supported by its webs contact with the end face walls.

Figure 1 shows a camera in section, a General view; Fig. 2 is a cross-sectional view of a chamber; an embodiment of a current supply is shown; in Fig.Z is a partial section of the chamber through the node of the current supply with the option of supplying current through the electrolyte. The arrows in the drawings show the direction of flow of the electrolyte, and the dashed line in Fig. 2 shows the profile of the treated areas during anodic dissolution.

The camera 1 of the device is pressed against the sheet stock of the part 2 through the elastic

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dielectric gasket 3, with notches 4, the shape of which represents the corrected profile of the sample taken from the workpiece, sealing the internal cavity of the chamber. A box-shaped cathode 5 is installed inside the chamber, the inner cavity 6 of which is a collector for supplying the electrolyte to the treatment zone through openings 7. The number of openings 7 and their diameter are selected to ensure the same pressure and, therefore, the speed of the electrolyte in the interelectrode gap. Along the perimeter of the chamber, the grid 8 of conductive material is fixed to the surface of the workpiece 2, which is an additional electrode.

The supply of technological current to the grid 8 is carried out through the switching screw 9 (Fig. 1) or through the electrolyte from the main electrode 5. In the second case (see Fig. 3), the switching screw 9 is replaced by a plug 10, which prevents leakage of the electrolyte, In space between the cathode 5 and the grid 8 are installed, the walls 11 of the dielectric

material, attached at one end to the working surface of the cathode 5 and supported by contact on the surface of the grid 8. The end surface, formed by a set of partitions 11,

it is also equidistant to the surface of the workpiece 2, the outer side surface of the partitions 11 and the inner side surface of the chamber 1 forms an annular collector 12 for removing the electrolyte from the treatment zone.

The device operates as follows. When roughing, when it is necessary to accelerate the process of anodic dissolution, the current is supplied to the additional electrode - grid 8 through a switching screw 9 connecting the electric electrode 5 and the grid 8 (see Fig. 1). In this case, the electrolyte passes from the supply manifold 6 and the hole 7 in the working surface of the cathode 5 to the grid electrode 8. Next, the electrolyte, evenly distributed by the grid structure 8, washes the processed sections of the sheet blank 2, limited by the profile of the grooves 4. From the interelectrode gap, the electrolyte - the cut gap between the lateral surface of the partitions 11 and the inner surface of the slots 4 of the dielectric strip 3 enters the collector of the removal of electrolyte (see figure 2),

When finishing with increased requirements for precision and surface cleanliness, the supply of technological current to the electrode - grid 8 is carried out through the electrolyte from the main

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electrode 5, in this case, the switching screw of the current lead 9 is turned off and, thereby, mechanically disconnecting the electrical contact between the electrodes 5 and 8. To avoid leaks, screw the plug 10 with a short threaded part into the formed channel (see Fig. 3). The electrolyte flow during finishing is carried out as described above, as well as during roughing.

The proposed device allows the processing of sheet blanks from two sides simultaneously. In this case, the sheet blank is placed between two chambers symmetrical with respect to the detail of the chambers of the devices, which are made similarly to the above-described device.

A positive effect of the proposed device for electrochemical processing lies in the fact that the device provides the expansion of technological capabilities by changing the mode of anodic dissolution of the metal during roughing and finishing, as well as creating stable conditions for the process by equalizing the electrolyte velocity field in the interelectrode gap, eliminating stagnant zones and thereby improving the accuracy and purity of processing.

The positive properties of the device include:

- simplicity and reliability of the device;

- the ability to process volume profile parts.

Claims (1)

SUMMARY OF THE INVENTION An apparatus for electrochemical processing, comprising a main and an additional electrode in parallel with a gap provided with separate current leads, an additional electrode is mounted on the side of the device’s working part and is made in the form of a grid of conductive material, which is designed to expand technological capabilities, the device is equipped with a chamber with collectors for supplying and discharging electrolyte, inside of which are placed the main and additional electrodes, elastic hydrochloric dielectric gasket with embossments intended for the localization of the electrochemical process in the treated areas, fixed to the additional electrode, dielectric partitions mounted between the primary and secondary electrode, wherein the electrode is mainly provided with openings for supplying the electrolyte into the treatment zone. 2 JW.3 # Compiled by M. Gladkov Editor A. Kuprkova Tehred M. Morgenthal Corrector N. Maximishinets Order 1242 VNIIIPI of the State Committee for Inventions and Discover at the State Committee for Science and Technology of the USSR 113035. Moscow, Zh-35, Rauska nab., 4/5