SU386380A1 - DEVICE FOR ADAPTIVE CONTROL OF A LATHE MACHINE - Google Patents

Description

one

The invention relates to the field of automatic control and is intended for use in automatic control systems for lathes.

Adaptive lathe control devices are known that contain a vibration sensor connected in series, an input amplifier, a control signal extraction unit comprising a high-pass filter and a first detector, an output amplifier, and an actuator.

A disadvantage of the known devices is low reliability of operation.

The proposed device differs from the known ones in that the control signal extraction unit contains a controllable filter and a second detector, with one input of the controllable filter connected to the output of the first detector, the second to the output of the additional reference source, and the output to the input of the second detector.

This embodiment allows to increase the reliability of work.

The drawing shows a functional diagram of the proposed device.

The device contains a vibration sensor / input amplifier 2, filter 3 high frequencies,

the first detector 4, the controlled filter 5, the second detector 6, the output amplifier 7, the actuating element 8, the source 9 of the reference signal and the block 10 of the selection of the control signal.

The device works as follows. The vibration sensor L mounted on the tool holder, converts its oscillations into

the electrical voltage applied to the input amplifier 2. Next, using a high-pass filter 3, the low-frequency components of the spectrum are attenuated, which are not related to the fragmentation of the machine. High-frequency oscillations pass through the filter, which, when crushed, occur are amplitude-modulated at a frequency corresponding to the speed of rotation of the workpiece. The depth of this modification characterizes the degree to which the machine approaches the crushing mode. The voltage that passes through filter 3 passes through the first detector 4. The detected signal contains, in addition to

high frequency components oscillations with modulation frequencies. The controllable filter 5 installed after the first detector separates from the general oscillation frequency spectrum with a frequency corresponding to the speed of rotation of the part.

The filter is tuned to the indicated frequency by applying a voltage from the source 9 of the reference signal (for example, from an electric generator, the rotor of which rotates together with the machine pin). The voltage passed through the filter 5 is supplied to the second detector 6, rectified, and through the output amplifier 7 the direct current is fed to the actuating element 8. This element controls the mode of the machine operation depending on the level of the generated signal, i.e. depending on the proximity of the machine to the crushing mode.

With appropriate adjustment of the device, we can: but ensure that at any time the metal removal rate is close to the maximum allowable speed at which crushing does not yet occur. Thus, the proposed device automatically provides the maximum (with

point of view no crushing) machine performance.

Subject invention

A device for adaptive control of a turning rate, comprising a series-connected B1 vibration sensor, an input amplifier, a control signal extraction unit,

which includes a high-pass filter and a first detector, an output amplifier and an actuating element, characterized in that. In order to improve the reliability of the device, the control signal extraction unit contains a controllable filter and a second detector, with one input of the controllable filter connected to the output of the first detector, the second to the output of the additional reference source, and the output to the input of the second detector.