RU2445190C2 - Round cup-like self-revolving cutting tool - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: proposed cutting tool comprises holder, outer conical surface and shaft with nut for fixation arranged to run in two bearings press-fitted in holder head. It comprises also chip removal sleeve with outer surface and soldered to cutting tool outer conical surface.

EFFECT: higher efficiency of cutting and longer life.

1 dwg

Description

The present invention relates to the machining of metal parts using round cup self-rotating carbide cutters, for example, turning surfaces of various designs, shafts, etc.

State of the art

Known designs of circular cup self-rotating carbide cutters (1). They provide for their mounting on the roller with a nut.

The disadvantages of such structures include the following:

Small particles of chips can fall into the gaps between the rotating parts of the cutter, which will cause a decrease in the durability of their work.

To reduce the likelihood of chips falling between the rotating parts of the cutter, it is possible to make chip cutting grooves [1] on its front surface, which are located close to the cutting edge. But their use has a drawback, because causes stress concentration at the edges of the groove, which reduces the durability of the cutters.

The proposed options for crushing chips [1, 2] can partially reduce the negative impact of descending chips. However, this causes vibration of the cutter and the quality of the machined surface deteriorates, or it is necessary to underestimate the parts of the cutting edge at the end, which weakens the cutting part of the tool.

The proposed round cup self-rotating cutter does not have such disadvantages.

The closest in technical essence is the use of overhead chipbreakers [2, p. 155-158], which are attached to the tool holder. Such fastening will lead to chip removal.

The reasons that impede the receipt of technical results are as follows:

Existing designs of chipbreakers only allow for chip removal, but do not allow it to not fall between the cutter and its holder, or will lead to excessive friction between the rotating cutter and the chipbreaker.

Signs of the prototype, coinciding with the declared, allows chip removal.

The task of the invention is to increase the durability of the cutting tool.

The claimed technical result is achieved in the proposed design of a circular self-rotating cutter by using a chip discharge sleeve with a conical surface. The mounting of this sleeve is carried out by soldering on the outer conical surface of the cutter.

The implementation of the inventive cutting tool is as follows:

Fastening by soldering the chip away sleeve on the conical surface of the cutter is done before it is fixed on the roller.

In existing practice, the treatment with round cup self-rotating carbide cutters is carried out either without the use of chip-removing elements on the cutter or with the use of chip-cutting grooves and chip breakers [1, 2].

These shortcomings hinder the use of a very promising direction of machining, which makes it possible to sharply increase the cutting conditions and the wear resistance of the cutting tool.

The technical result of the problem is achieved by the fact that the durability of the cutting tool is increased due to the reduction of the friction surface between the descending chips and the surface of the cutter. Protected by the chip-removing sleeve and the ingress of chip elements between the rotating elements of the device [2, p. 179-181].

A round cup self-rotating cutter is shown in FIG. 1, where the cup cutter 5 is fixed on the roller 2 with a nut 6. The roller 2 rotates in two iron-graphite bearings 3 and 4, pressed into the head of the holder 1 and fed with lubricant from the annular cavity 7. The chip-guiding sleeve 9 is mounted on the cutter 5 by soldering 8. The brand of solder and its quantity must be selected based on the temperature that occurs during operation at the place of soldering, and the allowable stresses of the solder at this temperature, from the effects of chips coming out during the cutting process. The design and manufacturing technology of the sleeve is simple.

Information sources

1. Antonov M.V., Gerasimova L.S.

Technology for the production of electric machines: textbook for universities. - M .: Energoizdat, 1982. - 512 p., Ill., Pp. 107-109.

2. Arshinov V.A., Alekseev G.A.

Metal cutting and cutting tool. Ed. 3rd, rev. and add .: Textbook for engineering schools - M.: Engineering, 1976.

Claims (1)

A round cup self-rotating cutter having a holder, an outer conical surface and a roller with a nut for fixing, mounted to rotate in two bearings pressed into the head of the holder, characterized in that it is equipped with a chip evacuated sleeve having an outer conical surface and fixed to the outer conical surface the cutter by soldering.

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