RU1808512C - Divice for treatment of heavy-treatable materials - Google Patents

Abstract

Usage: metalworking, processing of difficult materials. SUMMARY OF THE INVENTION: the device comprises an end mill 2, 5 6 in the housing 1 (3 12 --- between the cutting elements of which electrodes 3 and 4, spring-loaded in radial direction, are connected in pairs, connected to the corresponding poles of the pulse current source 11. Three parts of the working surface of each electrode coated with a wear-resistant dielectric material 18. The thickness of the coating corresponds to the gap between the working surfaces of the electrodes and the workpiece surface, which ensures a stable flow The scanning of electric discharges between them increases the heating rate and the productivity of processing parts.2 ill. 7 8 10

Description

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The invention relates to metal processing, in particular to the machining of difficult-to-work materials and can be used in the manufacture of parts for the aviation, chemical and instrumental industries, as well as in repair facilities for the processing of parts fused with wear-resistant coatings.

An object of the invention is to increase processing productivity by significantly heating and softening the surface of the part.

This goal is achieved in that in a device for processing difficult materials, comprising a housing and a tool located therein, between the cutting elements of which are placed radially spring-loaded electrodes in pairs, connected by current leads to the corresponding poles of the pulse current source, a part is coated on the surface of each electrode made of wear-resistant dielectric material.

Figure 1 shows a longitudinal section along aa in figure 2; figure 2 is a section along BB in figure 1.

The device contains a housing 1, a tool (end mill) 2, cathodes 3, anodes 4, current leads 5, 6, brushes 7, brush holders 8, busbars 9, 10, a pulse current source 11, insulating sleeves 12, insulating rings 13, ring springs 14. An end mill 2 is installed in the housing 1 and secured against axial movement by a nut 15. From the electrodes 3, 4, the mill 2 is insulated with a sleeve 16 made of dielectric materials. The torque from the housing 1 of the milling cutter 2 is transmitted by means of a key 17. The electrodes 3, 4 are made in the form of segments located between the cutting elements of the milling cutter 2. The electrodes 3 are installed in the grooves of the current supply 5, and the electrodes 4 are installed in the grooves of the current supply 6. In order to precisely maintain the gap Between the outer surface of the electrodes and the workpiece surface, a wear-resistant dielectric coating 18, for example, silicon carbide, the thickness of which is equal to the gap, is applied to a part of the indicated surface. To ensure contact between the electrodes 3 and 4 with the machined surface of the part 19, ring springs 14 are installed in the annular grooves of the inner surfaces of the electrodes 14. The housing 1 is installed in the spindle of the milling machine.

A device for processing difficult materials works as follows.

The milling cutter 2 is rotated at a speed corresponding to the cutting speed, and the parts 19 report the feed movement, the speed which corresponds to the value of the minute feed. During processing, pulses of electric current are passed between the cathode 3 and the workpiece surface 19 and between the specified surface and the anode 4. The duration of the pulses is chosen based on a predetermined heating temperature of the workpiece surface, and the time between bits corresponds to the selected cutting speed. Under the action of the ring springs 14 and by means of a dielectric coating 18, the electrodes 3 and 4 are in contact with the workpiece 18 during processing. By this contacting, a clearance S between the working surfaces of the electrodes 3 and 4 and the workpiece surface is reliably maintained, which creates Good conditions for generating stable discharges between the part and the electrodes. When the bits are passed, the treated surface is heated to a predetermined temperature. As a result of heating, there is a significant softening of the processed material, which leads to an increase in processing productivity. Simultaneous generation of discharges between the electrodes and the surface of the workpiece allows increasing the heating area and, consequently, increasing the cutting speed.

Compared with the prototype, the application of the proposed method for processing difficult materials provides an increase in processing productivity by at least 37%, a reduction in the cost of processing by 43%.

Claims (1)

SUMMARY OF THE INVENTION A device for processing difficult materials, including a cutting tool placed in a housing, electrodes connected by current leads to a current source, characterized in that, in order to increase processing productivity due to significant heating and softening of the surface of the part, the electrodes are placed in pairs between the cutting elements of the tool are made spring-loaded in the radial direction and a part of the surface of each of them is coated with wear-resistant die electric material in this case, the current source is made in the form of a pulse current source. e-B