SU879559A1 - Device for controlling lathe feed - Google Patents

Description

(54) DEVICE FOR CONTROLLING THE SUPPLY OF A LATHE MACHINE The invention relates to the field of metal processing, to vibration damping devices of the technological system machine-device-tool-part (SPITS) arising during the cutting process, and is intended for use with machine tools having controlled drives feed, for example, on machine tools. with CNC. A device in which, in order to quench the vibrations of the AIDS system, arising during the cutting process, is carried out by changing the cutting speed or feed rate during the cutting process, which contains a variable parameter sensor connected to the control elements. Of the known devices, the closest to the invention is device 2, which contains a pair and a second vibration sensor, the first and second selective narrowband filters, a sawtooth generator, a dividing unit, a nonlinear element of the zone type, insensitivity, a scanning unit , memory, selective filter, amplifiers, power amplifier and electromechanical converter. The device analyzes the vibration spectrum of the cutter, and on the basis of this analysis, harmonic oscillations are generated superimposed on the cutter in the axial direction, and the frequency of these vibrations changes in this way until the oscillation amplitude of the cutter in the radial direction becomes less than a certain threshold. value. The disadvantages of the known device are the complexity and low reliability of the electronic control circuit. The aim of the invention is a spread. range of regulation ycTpoji. The goal is achieved due to the fact that a device containing a feed drive, a series-connected vibration sensor, a vibration detector, a threshold element, a saw-tooth voltage generator and a memory block, the second input of which is connected to the output of the threshold element, are inputted included spindle speed sensor, controlled frequency generator, modulator and adder, to the second input of which the output of the initial feed setpoint device is connected. The output of the adder is connected to the input of the feed drive, and the output of the memory unit is connected to the second input of the modulator.

The drawing shows a block diagram of the device.

The device comprises a caliper I, on the tool holder 2 of which a vibration sensor 3, a vibration detector 4, a threshold element 5, a sawtooth voltage generator 6, a memory block 7, a modulator 8, an adder 9, an initial feed 10, an I feed drive are installed, controlled frequency generator 12, spindle speed sensor 13.

The device works as follows.

Vibrations arising in the process of resanning are converted by sensor 3 into an electrical signal supplied to detector 4 and converted by it into a post voltage proportional to the amplitude of vibrations, which is fed to the input of threshold element 5. If the amplitude of vibrations exceeds a certain threshold value determined by the element 5, a signal appears at its output, which starts the generator 6, and block 7 is reset, and then switched to a mode when the signal from the output of the generator 6 passes to its output without changing h. modulator input 8. To the first input of the modulator 8 A sinusoidal voltage is supplied from the output of the generator 12. The frequency of this voltage is determined by the magnitude of the signal taken from the sensor 13 and fed to the control input of the generator 12. At the output of the modulator 8 a sinusoidal voltage modulated according to a linearly increasing law appears, which arrives at the first input of the adder 9 and is summed with the tension applied to its second input from the setting unit 10 of the feed. From the output of the adder 9, the signal is fed to the input of the feed drive 11, which drives the caliper in accordance with the waveform at the output of the adder 9. As a result, the radial vibrations are damped, the input voltage of the element 5 decreases below the threshold value, and the start-up signal to its the output disappears, and block 7 is transferred to the storage mode of the last signal value at the output of generator 6, and generator 6 is reset.

If, after some time, vibrations occur again, the processes described are repeated.

The use of the proposed device allowed us to increase the cutting depth 1.7-2 times, without reducing the quality of processing, and thus increase productivity.

Claims (2)

1. Author's certificate of the USSR 662319, cl. On 23 a 15/00, 1978. 2. USSR author's certificate number 637782, cl. G 05 13/02, 1978 (prototype). // Zj M fff ff one d