RU176555U1 - SQUARE DORN FOR ELECTROMECHANICAL HARDENING - Google Patents

Abstract

The utility model relates to mechanical engineering, in particular, to tooling for surface hardening and can be used for hardening square holes. The door for electromechanical hardening of square holes includes a mandrel with an annular groove on the front surface, a calibrating tooth, coupling nuts and a current-insulating sleeve for Morse cone fixing ring. An axial blind hole is made in the upper end part of the mandrel, hermetically sealed with a screw plug. A radial blind hole is made in the middle part of the mandrel below the coupling nuts, communicating with the axial hole and a fitting is installed. In the lower part of the mandrel on the outer side there are two channels symmetrical to each other for supplying the process fluid to the mating surfaces of the reinforcing element and the machined surfaces of the hole. The presence of the channel system in the mandrel will allow supplying the process fluid to the mating surfaces of the reinforcing element and the machining surfaces of the hole, thereby improving heat removal from the contact zone and improve the quality of hardening.

Description

The utility model relates to mechanical engineering, in particular, to tooling for surface hardening and can be used for hardening holes of square section.

Known mandrel for electromechanical hardening of holes of square section [Patent RU No. 146554, Publ. 10/10/2014, Bull. No. 28, cl. B23D 42/02], including a mandrel with an annular groove on the front surface, a calibrating tooth, coupling nuts and a current-insulating sleeve under the Morse cone, a retaining ring.

Known mandrel for electromechanical quenching of square holes has the disadvantage of poor heat removal from the contact zone of the reinforcing element with the working surfaces of the hole.

The technical result is an increase in the intensity of heat removal from the contact zone of the reinforcing element with the working surfaces of the hole.

The specified technical result is achieved by the fact that in the upper end part of the mandrel an axial blind hole is made, hermetically plugged by a screw plug. In the middle part of the mandrel below the coupling nuts, a radial blind hole is made communicating with the axial hole and a fitting is installed. In the lower part of the mandrel on the outside, two channels are symmetrical to each other for supplying the process fluid to the mating surfaces of the reinforcing element and the machined surfaces of the hole.

In FIG. 1 shows a general view of a mandrel for electromechanical quenching of square holes, in FIG. 2 - section along the line aa.

An electromechanical hardening of square holes includes a mandrel with an annular groove on the front surface 1, a calibrating tooth 2, a coupling nut 3, and a current-insulating sleeve for a Morse taper 4, a locking ring 5. An axial blind hole 6 is made in the upper end part of the mandrel, hermetically sealed with a screw cork 7. In the middle part of the mandrel below the tightening nuts, a radial blind hole is made, communicating with the axial hole and a nozzle is installed 8. In the lower part of the mandrel on the outside there are two symme ary each other channel 9 for supplying the processing liquid to the mating surfaces of the reinforcing member and the work hole surfaces.

They work with a mandrel for electromechanical quenching of square holes as follows. A mandrel with a calibrating tooth is inserted into the hole to be machined. The tool moves vertically down during processing. A current with a density j = 250 ... 300 A / mm ^{2 is} passed through the place of contact of the tooth with the treated surface. As a result, the contacting surfaces of the reinforcing tooth with the inner surface of the hole are heated to a temperature of 900 ... 1000 ° C, and with 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, an axial hole in the mandrel and two radial holes on the outside mandrel instantaneous heat dissipation.

Claims (1)

Dorn for electromechanical hardening of the surface of a square hole, containing a mandrel with an annular groove on the front surface, a calibrating tooth, a locking ring, coupling nuts and a current-insulating sleeve for a Morse cone, characterized in that an axial blind hole is made in the upper end part of the mandrel, hermetically blanked by a screw a stopper, in the middle part of the mandrel below the coupling nuts a radial blind hole is made, communicated with an axial blind hole, and a fitting for supplying cooling is installed th liquid at the bottom of the mandrel two symmetrical to each other channel formed on the outside for supplying a cooling fluid to the mating surfaces of the sizing tooth of the machined hole and the axial blind hole in the mandrel.

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