SU1419815A1 - Method of optimization of the cutting process when working with two cutters - Google Patents

Abstract

The invention relates to a machine tool industry, in particular to controlling the cutting process, and can be used on machine modules of flexible manufacturing systems for predicting cutting conditions. The purpose of the invention is to improve the accuracy of the cutting process by eliminating the effect of the total pulse. elastic waves of stresses and wear of the cutting tool for determining the optimal parameters. When operating with two cutters, acoustic emission signals are recorded with equal heat cutting EMF signals on both cutters. Cutters are used as thermo-emf cutting sensors for symmetrical machining of parts. Thermocouples are included one:; another through a measuring unit with a sensitive null indicator; , its control input is a com- bin hyena with a null-nschsator output. At the beginning of the cutting process, the circuit with a null indicator is adjusted so that the output is zero. At the same time, the register of the characteristics of the acousto-emission signals, by which the optimal parameters of the cutting process are chosen, is measured and measured. When one of the incisors enters the stage of accelerated wear, a blocking recorder signal appears on the B. trigger of the null indicator, resulting in recording the characteristics of the acoustic emission signals associated only with the cutting process, eliminating interference associated with the wear of the incisors, 2 or

Description

The invention relates to a machine tool industry, in particular to the counter, gy of the cutting process 5 and can be used on machine tool modules of flexible manufacturing systems for: predicting cutting conditions.

The aim of the invention is to improve the accuracy of the optimization of the cutting process due to the absence of the influence of dependencies between the total it-elastic elastic stress waves and the wear of the cutting tool on the determination of the optimum parameters

Fig, presents a structural diagram of the implementation of the method; in fig. 2 illustrates a method for carrying out the method;

A 1-metrically machined part 1 with two cutters 2 and 3 is installed in the machine containing measuring circuit 4 (for measuring the cutting thermal emf) with a sensitive zero indicator, an acoustic emission sensor 5, fixed on one of the tools, for example 2., , amplifier 6, meter 7 of averaged characteristics (for example, the envelope amplitude) of acoustic emission signals and recorder 8, whose control input is connected to the output of circuit 4,

During operation, optimization of the cutting process for this method is as follows.

At the beginning of the cutting process using the controller 9, the measuring circuit 4 is adjusted so that the input signal is zero. This is possible, since the cutting conditions for both cutters 2 ji. 3 are approximately the same, their wear is also (at the initial moment it is zero). At the same time, the data are received at 5 times acoustic emission signals; i-ix amplifier gain 6 n change ie kk averaged characteristics in block 7 "

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In section 1 (area of the graph a), t de the wear of both cutters is small and equal to Kors, the output signal of block 4 is close to zero. Changing the parameters of the cutting process (sections 1, 11-5 III - area b), you can assign them the characteristics of acoustic emission signals and determine their level corresponding to the optimal parameters (speed, depth of cut, feed, part material) of the cutting process. When one of the incisors enters the last stage of wear, its thermo-emf accelerated by 5 begins to increase sharply. The likelihood that this stage will start simultaneously for both cutters is practically zero. As a result, at the output of block 4, a signal appears (section 11 - area a), which blocks the operation. recorder 8 (section IV - area b) of the method, the method allows to record the change in the averaged characteristics of the acoustic emission signals 5 associated only with the cutting process, to eliminate interference associated with the wear of the cutters, and consequently to improve the accuracy and reliability of the process optimization cutting,

In addition, the implementation is simplified, since the device unit 7 can be used; for example, the envelope amplitude meter of acoustic emission signals.

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A method for optimizing the cutting process when operating with two cutters consists in measuring the acoustic emission signal, the maximum value of which determines the optimum value of the technological parameter (5; c, characterized in that, in order to improve the accuracy, acoustic emission signals are recorded when the cut emf signals are equal But both of them are 3.; ah.

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Claims (1)

Claim A way to optimize the cutting process when working with two cutters consists in measuring the acoustic emission signal, the magnitude of which determines the optimal value of the technological parameters, which is 45 and the fact that, in order to improve accuracy, acoustic emission signals are recorded at equality of signals of thermo-EMF cutting on both cutters. Figure 1 FIG. 2