SU610651A1 - Apparatus for electric contact machining of metals - Google Patents

Description

(54). DEVICE FOR ELECTROCONTACT METAL PROCESSING

TUBULAR ELECTRODE

6, and the annular protrusions 11-12 on. The electrode holder 2, also located below and above the holes 6.

The annular protrusions 9 and 11 and 10 and 12 are interconnected with a gap of 0.1– 0.6 km, have multiple-thread screw cuts of the opposite direction And form two pairs of screw-bush, the bottom of which serves for a given direction of rotation of the electrode holder 2.v the labyrinth pump, and the top - a labyrinth seal.

The item 13 to be fixed is mounted on a rigid stand 14, on the upper surface of which an annular groove 15 is made, which serves to ensure an unobstructed exit of the electrode 1 upon completion of the process. The stand 14 together with the product 13 is placed in the bath 16 with the working fluid. The support 14 with the lower surface is mounted 20 on the table 17 and separated from it by an insulating gasket 18.

The positive pole of the DC source 19 is connected through the rod 4 and the stand 14 to the product 13. The negative pole of the source 19 with the help of brushes 20 through the electrode holder 2 is connected to the 1G electrode

The device works as follows. ..thirty

Before starting the firmware, the product 13 is mounted on the stand 14. The pneumatic cylinder 3 is turned on, the rod 4 is lowered and presses the workpiece 13 on the surface of the rate 14.

Through electrode electrode 2, electrode 1 is reset to the original position with an initial clearance of 1–3 mm and rotation is reported to electrode holder 2. Then, a low pressure pump is turned on. After the working bath 16 is filled with liquid up to a predetermined level, switching on the power source 19 energizes the electrical power supply and turns on the working supply of the electrode holder 2.

Upon reaching the interelectrode gap, not exceeding O, 01-0.2 mm, between the electrode 1 and the product 13, excite-B with short arc discharges.

The working fluid from the low pressure pump through the nozzle 7, the channel 5 and the holes 6 passes into the cavity 8, is sucked into the annular gap between the lower lugs 9 and 11, which form a pair of screw hub, which serves as a labyrinth pump, which under high pressure supplies fluid to the interelectrode gap

The labyrinth seal 1, formed by the protrusions 10 and 12, limits the volume of working fluid in the cavity .8 and maintains the pressure created by the low pressure pump in it by creating a counter pressure equal to it.

The length of the protrusions 11 and 12 is selected on the basis of ensuring the operability of the labyrinth pump and the labyrinth seal to the end of the product firmware, taking into account tool wear.

Claims (2)

When the electrode reaches 1-given processing depth, the working wire is stopped and the electrode is retracted to its original position. Turn off the low-pressure pump, drive the rotation of the electrode holder 2 and the power source 19. Claims The device for electrocontact; the processing of metals by a tubular electro- house, mounted on the end face of the rotatable hollow-eLie-containing spruce tree inside which the core is located. Having an internal longitudinal channel with radial holes for supplying the working medium to the treatment zone, this is so that, in order to increase the productivity of the process due to the efficient pumping of the working medium, the rod and the electrode holder are higher and The below-mentioned radial holes are provided with annular protrusions with a multiple-thread screw thread in the opposite direction, forming a pair of screw-bush, one of which is a labyrinth pump, and the other is a labyrinth seal. Information sources,; taken into account in the examination: Iw Levinson BM, Lev B.C..Help-A Manual on Electrotechnology. Electroerosion processing of metals. Lenizdat, 1972, p. 212. 2. USSR author's certificate 234086, class B 23 P 1/06, 1967. nineteen ff t7