RU212078U1 - DORN WITH DUPLEX TOOL - Google Patents

Abstract

The utility model relates to mechanical engineering and repair production, in particular to tooling for holemaking. The mandrel with a duplex tool contains a mandrel, in the tail part of which an external thread is made, on which coupling nuts and a current-insulating sleeve are installed. In the front part of the mandrel, a centering sleeve, a shaped reinforcing tooth and a calibrating tooth are fixed with a nut, and the centering sleeve and calibrating tooth are isolated from the mandrel and shaped reinforcing tooth by insulator bushings and insulating rings. At the end in the tail part 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 an axial blind hole, in which a fitting for supplying coolant is installed, and in the front part of the mandrel, on the outer side, two channels symmetrical to each other are made for supplying coolant to the mating surfaces of the hardening tooth and the hole being machined. . In the front part of the mandrel behind the calibrating tooth, two flats are made symmetrically on the outside. The calibrating 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 caliber part made of hard alloy in the form of a spherical belt, which is a continuation of the chamfer, a continuation of the gauging part is a rear part made of steel in the form of a truncated cone , with its base adjacent to the calibrating part. Making the gauge tooth composite will reduce the cost of its manufacture due to the use of cheaper material in less loaded areas and reduce the complexity of manufacturing by facilitating the machining process. The presence of flats on the mandrel will facilitate the process of assembling and disassembling the tool.

Description

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

During the operation of some mating surfaces of machine parts of the “shaft-hole” system, the main wear of the hole occurs on one side due to the uneven distribution of the load on the surface of the hole. As a result, there is no need to harden the entire surface of the hole.

Known mandrel with a duplex tool [Patent RU No. 197768, publ. 05/28/2020, Bull. No. 16, class. B29D 30/12], which includes a mandrel, in the tail part of which an external thread is made, on which coupling nuts and a current-insulating sleeve are installed, in the front part of the mandrel a centering sleeve, a shaped reinforcing tooth and a gauge tooth are fixed, and the centering sleeve and the gauge tooth are isolated from of the mandrel and the shaped reinforcing tooth with insulator bushings and insulating rings, at the end in the tail part 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, into which a fitting is installed for supplying cooling liquid, 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 reinforcing tooth and the hole being machined.

Known mandrel with a duplex tool has the following disadvantages - the high cost and complexity of manufacturing tools, in particular the calibrating tooth, as well as the high complexity of assembly and disassembly of the tool.

The technical result is a reduction in the cost and labor intensity of tool manufacture, as well as a reduction in the labor intensity of assembling and disassembling the tool.

The specified technical result is achieved by the fact that in the front part of the mandrel behind the calibrating tooth, two flats are made symmetrically on the outside, the calibrating tooth is made composite and includes an intake part made of steel in the form of a truncated cone, to the base of which is adjacent a calibrating part made of hard alloy in the form of a spherical belt , which is a continuation of the intake part, the continuation of the gauge part is the back part, made of steel in the form of a truncated cone, the base adjacent to the gauge part.

In FIG. 1 shows a general view of the mandrel;

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

in fig. 3 - section along the line B-B;

in fig. 4 shows a general view of the gauge tooth.

The mandrel with a duplex tool contains a mandrel 1, in the tail part of which an external thread is made, on which coupling nuts 2 and a current-insulating sleeve 3 are installed. In the front part of the mandrel 1, a centering sleeve 5, a shaped reinforcing tooth 6 and a calibrating tooth 7 are fixed sleeve 5 and gauge tooth 7 are isolated from mandrel 1 and shaped reinforcing tooth 6 by insulator bushings 8 and insulating rings 9. At the end in the tail part of mandrel 1, an axial blind hole 10 is made, hermetically plugged with a screw plug 11. In the middle part of the mandrel, a radial blind hole is made a hole communicated with an axial blind hole 10, in which a fitting 12 is installed for supplying coolant, and in the front part of the mandrel 1 on the outer side there are two channels 13 symmetrical to each other for supplying coolant to the mating surfaces of the hardening tooth 6 and the hole being machined. In the front part of the mandrel 1, behind the calibrating tooth 7, two flats 14 are made symmetrically on the outside. The calibrating tooth 7 is made composite and includes the intake part 15, made of steel in the form of a truncated cone, to the base of which is adjacent the calibrating part 16 made of hard alloy in the form of a spherical belt, which is a continuation of the intake part 15, the continuation of the gauge part 16 is the rear part 17, made of steel in the form of a truncated cone, the base adjacent to the gauge part 16.

Work with a mandrel with a duplex tool as follows.

A mandrel with a duplex tool is brought to the hole to be machined. A current with density j=250...300 A/mm ² is passed through the place of contact of the hardening tooth with the treated surface of the hole. As a result, the contact area of the hardening tooth with the inner surface of the hole is heated to a temperature of (900...1100)°C, and with the subsequent axial movement of the mandrel with a duplex tool relative to the axis of the hole and the supply of coolant to the hardening zone through the fitting, the axial hole in the mandrel and two radial holes on the outside of the mandrel, instantaneous heat dissipation occurs, which contributes to the formation of a hardened segmental surface into the hole. The deforming carbide tool moves relative to the hole following the hardening tool with a technological interference of (0.05…0.1) mm, reducing the surface roughness of the hole and forming the final dimensions of the hole.

The presence of nuts on the mandrel will allow you to quickly and reliably fix the cable between them and supply current to the reinforcing tooth, and the presence of a current-insulating sleeve will ensure reliable isolation of the machine.

Due to the execution of the current-insulating sleeve under the Morse taper, it is possible to install the mandrel through the adapter sleeve in the spindle of a vertical milling machine or in the quills of the tailstock of a screw-cutting lathe.

The presence of a centering sleeve in front of the hardening tooth allows you to effectively orient the duplex tool relative to the hole being machined and its working surface.

By making the hardening tooth shaped, with one working surface, it is possible to harden only the surface of the hole subject to wear, thereby increasing the efficiency of the process.

Making the gauge tooth composite will reduce the cost of its manufacture due to the use of cheaper material in less loaded areas and reduce the complexity of manufacturing by facilitating the machining process.

The presence of flats on the mandrel will facilitate the process of assembling and disassembling the tool.

Claims (1)

A mandrel with a duplex tool containing a mandrel, in the tail part of which an external thread is made, on which coupling nuts and a current-insulating sleeve are installed, in the front part of the mandrel a centering sleeve, a shaped reinforcing tooth and a gauge tooth are fixed with a nut, and the centering sleeve and the gauge tooth are isolated from the mandrel and a shaped reinforcing tooth with insulator bushings and insulating rings, at the end in the tail part 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, into which a fitting for supplying coolant is installed , 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 hole being machined, characterized in that in the front part of the mandrel behind the calibrating tooth, two channels are made symmetrically outside gauge, the calibrating 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 caliber part made of hard alloy in the form of a spherical belt, which is a continuation of the chamfer, a continuation of the gauging part is the rear part, made of steel in the form truncated cone, the base adjacent to the gauge part.

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