SU1117125A1 - Method of working by cutting - Google Patents

Abstract

CUTTING METHOD, according to which the frequency of rotation of the workpiece and the feed of the cutting tool are changed, characterized in that, in order to improve the quality of the machined surface and the durability of the cutting tool, the feed of the tool is changed sinusoidally, and the frequency of rotation of the workpiece is the same the law shifted by 180 ° regarding the law of change of filing.

Description

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The invention relates to the processing of metals by cutting and can be used to increase the technological stability of the cutting tool, for example, in finishing operations during turning.

A known method of machining, according to which the frequency of rotation of the workpiece and the feed of the cutting tool 1 are changed.

The use of this method of machining to increase the technological stability of the cutter (on the roughness of the machined surface) is impossible due to the direction of change in the feed. The feed change is made in the direction of the axis perpendicular to the cutting plane and passing through the main cutting edge. In this connection, it is impossible to prevent the occurrence of groove wear in this way. In this case, the change in the cutting speed is carried out according to a linear law (either it increases or decreases), since the face turning is carried out with a constant frequency of rotation of the part. In this regard, the cutting temperature is constantly changing and different from the optimal one, which ultimately leads to an increase in wear intensity.

The aim of the invention is to improve the quality of the treated surface and increase the durability of the cutting tool.

This goal is achieved by the fact that, according to the cutting method, the frequency of rotation of the workpiece and the feed of the cutting tool are changed with the cutter, the latter is changed according to the sine wave law, and the frequency of rotation of the workpiece is shifted by 180 ° relative to the law of feed change.

FIG. Figure 1 shows the dependence of dimensional stability on the machining length R f (l) under turning conditions at constant and stepwise modified feeds S); in fig. 2 - the dependence of the creep distribution ((. The response on the processing length R. (l). Realized for the conditions of turning on constant, modes and for the method in which the feed S varies sinusoidally and the rotation frequency changes in detail sinusoidal law, shifted by 180 ° relative to the feed.

Example. The widespread introduction of tools from synthetic superhard materials in the processing of hardened steels instead of grinding gives a great economic effect. However, the STM tool in some cases has a high dimensional stability and is characterized by a lower technological resistance (in terms of the roughness of the treated surface). The proposed method allows to increase the technological durability of the cutter in some cases by a factor of 20 and the dimensional durability.

bring to the maximum value.

Processing is carried out on a high-precision turning lathe machine 1К62П, which has a stepless thyristor drive in the main movement circuit. Processed material - steel 40X. Tool material - Elbor-R synthetic superhard material with mechanical fastening inserts having a standard geometrical) cutting part.

Feed change made by spec

with a special device included in the kinematic chain between the gearbox and the feedbox in a sinusoidal manner. The change in feed and speed is recorded by a CPS-4 potentiometer. The height of the irregularities of the treated surface was monitored by a microscope MIS-11. The criterion of technological stability was taken to be the parameter RZ 10 microns. The bluntness criterion is wear on the back surface.

hx 0.3 mm.

Presented in FIG. 2 the dependence Rz i {), realized for the conditions of turning in constant modes V 150 m / min S 0.084 mm / rev., T 0.25 mm and for the method,

The feed rate of which varies according to the sinusoidal law S 0.024-0.084.0.155 mm / rev. and the rotational speed of the part (cutting speed) changed (135-150-165 m / min) according to the sinusoidal law, shifted by 180 ° relative to the law of change

filing.

When turning at constant cutting conditions S-const, w (v) -const (Fig. 2), the cutter passes a path of 1500 m to a blunting criterion of L3 0.3 mm, and the cutter's path to the criterion of technological durability Rg 60 µm is 800 m The use of a new method of treatment allows to increase the dimensional resistance by 1.6 times, and t (; chnological resistance - by 5 times.

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Claims (1)

METHOD OF TREATMENT BY CUTTING, according to which the speed of the workpiece and the feed of the cutting tool are changed, characterized in that, in order to improve the quality of the machined surface and the resistance of the cutting tool, the feed of the tool is changed according to a sinusoidal law, and the speed of the workpiece is changed according to the same law shifted by 180 ° with respect to the law of change of filing. 600 900 1200 1500 P00 2100 2400 b, M 0.075 0.096 0.125 0142 a, 167 0.214 0.250 0.321 mm / οδ Figure 1 SU „„ 1117125 ·>