RU2000899C1 - Device for electrochemical machining - Google Patents

Abstract

Use in electrochemical deburring in small-diameter holes. Summary of the invention, the device includes jnec, a trod-tool in the form of a rod from a bundle of a bundle of elementary wires - electrodes of arbitrary cross-section, allowing electrolyte to flow, the wires being twisted helically and fit onto the circumference of the circle . The device contains on the electrode-tool dielectric elastic thin-walled otulka in the pid tube one end of which is rigidly fixed, and the other is free 4 silt

Description

The invention relates to mechanical engineering technology, in particular to the electrophysicochemical processing of machine parts, and relates to the construction of an apparatus for electrochemical processing.

The aim of the invention is to improve the quality and productivity in the processing of burrs in the holes of small diameters of machine parts. A device for electrochemical protection contains an electrode tool in isolation of a non-working surface, mounted in a guide sleeve and mounted on an electrode holder. equipped with channels for pumping electrolyte.

To achieve this goal, the device has an electrode-tool in the form of a rod from a bundle of helically twisted wires, and the insulation is made of a dielectric elastic thin-walled tube, one end of which is rigidly fixed in the guide sleeve.

In FIG. 1-4 are a graphical illustration of the invention.

Figures 1 and 2 show the electrode-tool 1 included in the device, a dielectric elastic thin-walled tube 2, the lower end of which is fixed with a nut 3 on a conical section 4 in the guide sleeve 5. The opposite end of the tube 2 is free.

The guide sleeve 5 abuts against the insulating strip 6, which is screwed into the holder 7 with holes 8 and 9 for pumping the electrolyte. The holder also has a cavity for electrolyte 10 and a shank 11 for fixing the electrode tool 1 by means of a nut 12.

The electrode tool 1 is made of a set of helically twisted wires 13 (at least two) in the form of a rod, and the diameter of the circumference described by OPR (Fig. 1, view A-A) corresponds to the inner diameter of the tube 2 in the idle state - (dtp, i.e. . without pumping electrolyte under pressure.

Figs. 3 and 4 illustrate the principle of operation of the device during electrochemical processing by deburring. An assembly for the electrochemical processing is mounted on the plate 14 of the fixture of the electrochemical machine. The device has an opening for supplying electrolyte to the treatment zone, the movement of which is indicated by arrows. On the

electrode-tool 1 with a dielectric elastic thin-walled tube 2 mounted workpiece 15 (type tee - part reinforcement), which has

internal cavity hole with burrs 16, which must be removed during processing. Initially, the fixation of the part 15 is carried out by the clamp 17, while the end of the electrode-tool protrudes beyond the size of the burrs 16.

In the idle position without pumping the electrolyte under pressure, there is a small gap between the tube and the part. When supplying the working electrolyte through the channels

8, 9 into the cavity 10 of the device, due to the pressure of the electrolyte, the tube 2 somewhat increases in diameter, therefore, the gap is eliminated. This ensures the sealing of the treatment zone, the final fixation of the part relative to the device for electrochemical processing, as well as the centering of the part by creating an annular gap 18. In this case, the electrolyte directly enters the zone of anode dissolution through the gaps between the helically twisted wires 13 and the annular gap 18. The process voltage from the source serves on the workpiece 15 (plus) and on the fixture 14 of the electrochemical machine (minus) having ohmic contact with the device PTO and electrode-tool 1.

Tee-type material parts were subjected to electrochemical treatment

12X18H10T. An electrochemical unit and a constant process voltage source VAK-630 were used. As a working electrolyte, a 12% solution of Na2SO4 was used. For processing

Burrs used an electrode tool in the form of a rod of three helically twisted brass wires with a diameter of 0.2 mm. It was experimentally established that the distance L from the loose end

the tube to the treatment zone should be within 1 (0.5 ... 1) Otr, where Otr is the diameter of the tube.

At the same time, the end of the electrode tool should protrude beyond the edge of the burr by a distance l (0.3 ... 0.5) Dip, which was also established experimentally.

(56) V.A. Shmanev et al. Technologists of electrochemical processing of parts in aircraft engine and television building, M .. Engineering. 1986, p.168

The claims

DEVICE FOR ELECTROCHEMICAL IMAGE

a coil containing an electrode tool with isolation of a non-working surface, mounted in a guide sleeve and mounted on an electrode holder. equipped with channels for pumping the electrolyte, characterized in that, in order to improve the productivity and quality of the processing of burrs in the holes of small diameter, the electrode tool is made in the form of a rod from a bundle of helically twisted wires, and the insulation is made of an elastic thin-walled tube, one of the ends of which are rigidly fixed in the guide sleeve.

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