SU1058715A1 - Method of determining optimum cutting speed - Google Patents

Abstract

METHOD FOR DETERMINING THE OPTIMAL CUTTING SPEED when machining, based on measuring the parameters of the cutting process, is different from the fact that, in order to reduce the labor intensity and material costs of the experiment, the strain from the residual process stresses at several points , determine the average strain, plot the dependence of the average strain on the cutting speed, and take the cutting speed corresponding to the minimum with The average strain of the test specimen. (L SP oo vl ate

Description

The invention relates to metal cutting in particular to the processing of thin-walled precision bushings.

The known method, namely, that the metal under investigation is processed at different cutting speeds and simultaneously cutting forces are measured, a graph of the dependence of the tangential component of the cutting force P on the cutting speed V is taken, and the optimum moment is taken as the optimum P2 versus V 1 graph.

The disadvantages of this method are the great complexity of the tests, the high cost and scarcity of the equipment used, which limits its use under production conditions.

The purpose of the invention is to reduce the complexity and material costs of the experiment.

This goal is achieved by the fact that according to the method of determining the optimal cutting speed during machining, based on measuring the parameters of the cutting process, the strain from technological residual stresses is measured at several points of the samples processed at different cutting speeds, the average deformed graph is determined dependency And

CP

These average deformations from the cutting speed and the optimal cutting speed correspond to the minimum average deformation of the test specimen.

FIG. 1 is a schematic of a device for measuring the deformation of the walls of a test specimen; FIG. 2 is a plot of cutting speed V.

Parts of the type, such as thin-walled precision bushings, are fastened to the mold and are machined to a given size, and the cutting speed during processing of each specimen is different and varies uniformly from the minimum to the maximum possible with this type of processing. The number of samples is chosen depending on the 0-required accuracy and the results of the experiment.

After processing, each sample 1 is installed in the fixture, and shown in FIG. 1. Indicators 5 2 at the initial moment are set to the zero-position.

After a certain time has elapsed, I take the readings of each indicator and determine the average depletion of the deformation by the formula

V

+ A: +

+ Ai

According to the experimental data

a graph of the mean value of the Asp deformation on the cutting speed V and for the optimal one selects the cutting speed, which corresponds to the minimum of the average strains y.

The tests are conducted on six samples in the form of thin-walled precision bushings with cutting speeds of 50-300 m / min.

According to the test results, a graph of Asp versus V is plotted (FIG. 2), which shows that the optimal cutting speed corresponding to minimum A is 150 m / min.

The proposed method is simple to implement, does not require large labor costs and expensive equipment.

Claims (1)

METHOD FOR DETERMINING THE OPTIMAL CUTTING SPEED during machining, based on measuring the parameters of the cutting process, characterized in that, in order to reduce the complexity and material costs of the experiment, the strain from the process residual stresses is measured at several points of the samples processed at different cutting speeds, they are determined average strain A _sr , build a graph of the average strain on cutting speed and take the cutting speed corresponding to the minimum average deformation of the test sample.