SU1227426A1 - Grinding method - Google Patents

Description

one

The invention relates to mechanical engineering and can be used in the manufacture of parts of high quality.

The purpose of the invention is to increase the durability of the grinding wheel and the quality of processing by means of vibrating the process stability under certain parameters of the additionally excited vibrations of the workpiece.

FIG. Figure 1 shows the relative change in the current radius of the grinding wheel and the cutting force during machining; in fig. 2 - pictures of changing the profile of the circle; Fig. 3 shows the device for the implementation of the proposed grinding method.

According to the proposed method, during machining, forced vibrations of the workpiece are controlled, and the harmonic analysis of the grinding wheel molds is monitored and harmonized. Additional vibrations in the direction perpendicular to the cutting plane are reported, and the phase of the workpiece is shifted relative to the phase reflecting the passage of the protrusion of the prevailing harmonic of the grinding profile. circle through the contact zone (Fig, 1), on

12

angle Y

 5 is determined from the condition

-

ABOUT,

The amplitude of oscillations can be chosen so that the maximum speed of the waviness of the circle is ensured, and the waviness of the workpiece does not exceed the allowable value of the product K, r de S - tolerance for the processed dimension coefficient, for 10

- j

- ig,, 20

227426g

hanging on the degree of geometric accuracy.

The nature of the consistent destruction of the waviness of a circle, characterized by the iR value, is shown in Fig. 2 (at the top — according to the prototype method, at the bottom — according to the proposal),

A device for implementing the inventive method comprises a headstock 1, a sensor 2, a profile of a grinding wheel 3, a sensor vibrator 4, a generator 5, a control device 6, a profilometer 7 in contact with the workpiece 8.

When using this device, the processing is carried out as follows.

Using a profilometer 7, control the waviness of the workpiece 8 to be processed. After the waviness of the workpiece as a result of uneven wear of the grinding wheel, the vibrating sensor 4 measures the amplitude and frequency of vibration of the workpiece, and sensor 2 - the profile of the working surface of the grinding wheel. The results of the measurements are sent to the control device 6, which, on the basis of the information received, sends a command to the sensor-vibrator 4 through the generator 5 to create additional oscillations, the phase of which is determined by the indicated dependence.

As a result of the excitation of the workpiece during the processing of additional oscillations, the phase of which is shifted by an angle d, an increase in the resistance of the pulley wheel is achieved up to three times; reduction of surface roughness, on average, by 80%; decrease in its waviness by 2.5-3 times.

25

thirty

35

40

min max FIG.

Editor M.Petrova

FIG 3

Compiled by I. Ermakova Tehred G. Gerber

Order 2249/16 Circulation 740 Subscription

VNIIPI 1 of the USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and Polygraphic Enterprise, Uzhgorod, Projecto st., 4

Proofreader I. Muska

Claims (1)

GRINDING METHOD, according to which during processing the forced vibrations of the workpiece are monitored and periodically informed of additional vibrations in the direction perpendicular to the cutting plane, characterized in that, in order to increase the grinding wheel durability and the quality of processing, the geometric shape of the grinding wheel is controlled with its harmonic analysis moreover, the phase of additional vibrations of the workpiece towards the grinding wheel is shifted relative to the phase reflecting the moment of passage of the protrusion the prevailing harmonic of the profile of the grinding wheel through the contact zone, at the angle s.c.-, the value of which is determined from the condition (2 99 tg --λ— i <0. c * SU „„ 12