RU212550U1 - DORN FOR ELECTROMECHANICAL HOLING - Google Patents

Abstract

The utility model relates to mechanical engineering and can be used for finishing and hardening holes. The mandrel for electromechanical processing of holes includes a mandrel with an external thread in the tail section, on which coupling nuts and a current-insulating sleeve are installed. In the front part on the mandrel, a reinforcing tooth and a calibrating tooth, isolated from the mandrel and reinforcing tooth, are fixed with a nut. The calibrating tooth is made composite and includes the intake part and the calibrating part. On the opposite side of the mandrel, a blind hole is made, hermetically plugged. In the middle part of the mandrel there is a radial blind hole in which a fitting for supplying coolant is installed. In the front part of the mandrel there are two channels symmetrical to each other for supplying coolant. The calibrating part is made with a wear-resistant coating based on titanium-silicon carbonitride. The technical result is to increase the resistance of the calibrating part. 3 ill.

Description

The utility model relates to mechanical engineering and repair production, in particular to tooling for finishing and hardening holes.

Known mandrel with a duplex tool [patent RU No. 208736, 01/11/2022, bul. No. 2], includes a mandrel with an external thread in the tail section, on which coupling nuts and a current-insulating sleeve are installed, in the front part, a reinforcing tooth and a gauge tooth are fixed on the mandrel with a nut, isolated from the mandrel and reinforcing tooth by an insulating sleeve and insulating rings, in the front part of the mandrel behind the gauge tooth, two flats are made symmetrically on the outside, the gauge tooth is made composite and includes a chamfer made of steel in the form of a truncated cone, to the base of which is adjacent a gage part made of hard alloy in the form of a spherical belt, which is a continuation of the chamfer part, the continuation of the gage part is the rear part made of steel in the form of a truncated cone, with its base adjacent to the gauge part, on the opposite side of the mandrel, an axial blind hole is made, hermetically plugged with a screw plug, in the middle part of the mandrel a radial blind hole is made, communicated with the axial blind hole, in which There is a fitting for supplying coolant, and in the front part of the mandrel on the outer side there are two channels symmetrical to each other for supplying coolant to the mating surfaces of the hardening tooth and the machined hole from the axial blind hole in the mandrel.

Known mandrel has the following disadvantages - the low resistance of the calibrating tooth and the unstable quality of the finishing and hardening of the holes.

EFFECT: increased resistance of the calibrating tooth and quality assurance of the finishing and hardening processing of the holes.

The specified technical result is achieved by the fact that the calibrating part of the calibrating tooth is made with a wear-resistant coating based on titanium-silicon carbonitride.

In FIG. 1 shows a general view of the mandrel for electromechanical processing of holes;

in fig. 2 - section along the line A-A;

in fig. 3 shows a general view of the gauge tooth.

The mandrel for electromechanical processing of holes includes a mandrel 1 with an external thread in the tail part, on which coupling nuts 2 and a current-insulating sleeve 3 are installed, in the front part on the mandrel with a nut 4 a reinforcing tooth 5 and a calibrating tooth 6 are fixed, isolated from the mandrel 1 and reinforcing tooth 5 an insulating sleeve 7 and insulating rings 8. On the opposite side of the mandrel 1, an axial blind hole 9 is made, hermetically plugged with a screw plug 10, in the middle part of the mandrel a radial blind hole is made, connected with the axial blind hole 9, into which a fitting 11 is installed for supplying cooling liquid, and in the front part of the mandrel on the outer side there are two channels 12 symmetrical to each other for supplying coolant to the mating surfaces of the hardening tooth and the machined hole from the axial blind hole 9 in the mandrel 1. two flats 13. Calibrating tooth 6 is made composite and includes the intake part 14, made of steel in the form of a truncated cone, to the base of which is adjacent the calibrating part 15 made of hard alloy in the form of a spherical belt, which is a continuation of the intake part 14, the continuation of the calibrating part 15 is the rear part 16, made of steel in the form of a truncated cone, with its base adjacent to the gauge part 15. A wear-resistant ion-plasma coating based on titanium-silicon carbonitride is applied to the gauge element of the gauge tooth.

The coatings were applied by the CIB method (condensation from the plasma phase in a vacuum with ion bombardment). The calibrating part of the calibrating tooth in the form of a spherical belt made of VK8 hard alloy, preliminarily cleaned of impurities, was placed in the chamber of the Bulat-6T installation with electric arc evaporators installed in it, the cathode materials of which include coating elements.

Work mandrel for electromechanical processing of holes as follows. The reinforcing tooth is brought to the hole being processed and a tight contact is created. A current with a density of 250…300 A/mm ² and a voltage of 4…6 V is passed through the point of contact of the hardening tooth with the surface being machined. °C, and with the subsequent axial movement of the mandrel relative to the axis of the hole and supply to the hardening zone of the coolant through the fitting, the axial hole in the mandrel and two radial holes on the outer side of the mandrel, instantaneous heat removal and the formation of a hardened layer occur. The gauge tooth following the hardening tooth smooths out the roughness and forms the final dimensions of the hole.

The use of the calibrating part of the calibrating tooth with an ion-plasma coating based on titanium-silicon carbonitride makes it possible to increase the resistance of the calibrating tooth by 1.2…1.4 times and ensure the quality of the finishing and hardening processing of holes in terms of the hardness of the surface layer and roughness.

Claims (1)

Mandrel for electromechanical processing of holes, including a mandrel with an external thread in the tail section, on which coupling nuts and a current-insulating sleeve are installed, in the front part, a reinforcing tooth and a calibrating tooth are fixed on the mandrel, isolated from the mandrel and reinforcing tooth by an insulating sleeve and insulating rings, in the front part of the mandrel behind the gauge tooth, two flats are made symmetrically on the outside, the gauge tooth is made composite and includes a chamfer made of steel in the form of a truncated cone, to the base of which is adjacent a gage part made of hard alloy in the form of a spherical belt, which is a continuation of the chamfer, a continuation the gauging part is the rear part made of steel in the form of a truncated cone, the base adjacent to the gauging part, on the opposite side of the mandrel there is an axial blind hole, hermetically plugged with a screw plug, in the middle part of the mandrel a radial blind hole is made, reportedly e with an axial blind hole in which a fitting for supplying a coolant is installed, and in the front part of the mandrel on the outside there are two channels symmetrical to each other for supplying coolant to the mating surfaces of the hardening tooth and the machined hole from the axial blind hole in the mandrel, characterized in that that the calibrating part of the calibrating tooth is made with a wear-resistant coating based on titanium-silicon carbonitride.

Images