SU813367A1 - Program-control device for grinding machine - Google Patents

Description

The invention relates to automatic control and can be used to control the position of the grinding headstock in a single-spindle grinding machine.

A known system of machine control software comprising a coordinate comparison unit connected to a register of a given coordinate and a position sensor and through a control circuit to a servo drive [1].

The disadvantage of this system is the relatively low accuracy of machining parts when using them on grinding machines due to wear of the grinding wheel.

This is because the current coordinate is measured relative to the cutting edge of the grinding wheel, which is determined not only by the position of the grinding head, but also by the dimensional wear of the grinding wheel, which causes an error.

Closest to the proposed is a device for programmed control of a grinding machine, comprising serially connected pulse generator 2, a counter, a comparison unit connected to a master register, a phase detector, a modulator, an amplifier and an engine connected via a compensation mechanism to the phase shifter rotor connected by stator windings through amplifiers and a ⁵ phase splitter to the second output of the counter, and the output with the second input of the phase detector through a pulse shaper [2].

The disadvantage of this device is 10 is also the relatively low accuracy of machining parts on grinding machines.

The purpose of the invention is to increase the accuracy of processing by increasing the accuracy of the device.

This goal is achieved by the fact that in the device for programmed control of the grinding machine, comprising a phase splitter and series-connected pulse generator, counter, comparison unit 2Q, connected by other inputs to the outputs of the master register, a phase detector, modulator, amplifier and motor connected via the first compensation mechanism to the rotor winding of the first phase shifter, the output of which is connected to the second input of the phase detector through the first pulse shaper, a second com a compensation, a frequency divider, a low-pass filter block and a second phase shifter and a second pulse shaper connected in series, the output of which is connected to the counter reset input, the rotor winding of the second phase shifter is connected to the second / third compensation mechanism, and the stator windings of the first and second phase shifters through the block low-pass filters are connected to the outputs of the phase separation, • 'A, connected by the input to the output of the pulse generator through a frequency divider.

The drawing shows a diagram of the device.

The device contains a pulse generator 1, a frequency divider 2, a phase splitter 3, low-pass filters 4–6, the first 7 and second 8 phase shifters, the first 9 and second 10 pulse shapers, a counter 11, a comparison unit 13, a setting register 13, a phase detector 14, a modulator 15, amplifier 16, engine 17, first 18 and second 19 compensation mechanisms, and filters 4-6 form a block 20 of low-pass filters.

The device operates as follows.

High-frequency oscillations of the generator 1 are fed to the information input of the counter 11 and the divider 2, the phase shifter 3 forms from rectangular oscillations available at the output of the divider 2, the rectangular pulses are phase shifted by 120 °. Filters 4-6 distinguish from sequences of rectangular pulses of fundamental harmonic voltage, which are used to power the stator windings of phase shifters 7 and 8.

The voltage from the rotors of the phase shifters 7 and 8 is supplied to the shapers 9 and 10, where the voltage of the sinusoid is limited, differentiated and formed, resulting in a phase pulse. The pulse of the phase shifter на is supplied to one of the two inputs of the detector 14, the second input of which is supplied by a pulse from block 12. The task of block 12 is to bitwise compare the binary code contained in register 13 with the continuously increasing binary code of counter 11. At the time of the equality of the codes, block 12 provides a pulse to the phase detector 14.

The detector 14 generates a voltage either of positive polarity (if the phase pulse follows the comparison pulse) or negative (if the phase pulse follows the comparison pulse). The voltage from the output of the detector 14 is modeled by the modulator 15 into a sequence of pulse-width modulated pulses, the duration of which is proportional to the error signal (voltage from the output of the phase detector 14), is amplified by the amplifier 16 and fed to the motor 17, which rotates the phase shifter rotor until the comparison pulses and phase do not match.

The pulse of the phase shifter 8 resets the bits of the counter 11 to “0”, after which, under the action of the counting pulses generated by the generator 1, the binary code again increases in the counter 11. Thus, the count in the counter 11 starts relative to the reference pulse that the shaper 10 generates. Considering that the rotor of the phase shifter 8 is connected to the compensation mechanism 19 mounted on the grinding machine, the reference pulse shifts as the grinding wheel wears out and thereby compensates for the processing error due to wheel wear .

The use of this device significantly improves the accuracy of parts on a grinding machine.

Claims (2)

(54) DEVICE FOR SOFTWARE CONTROL OF GRINDING MACHINE of the first phase shifter, the output of which is connected to the second input of the phase detector through the first pulse shaper, introduced a second compensation mechanism, a frequency divider, a low-pass filter unit and a serially connected second phase shifter and the second pulse shaper whose output is connected to the input "reset of the counter, the rotor winding of the second phase shifter is connected to the compensation mechanism, and the static windings of the first and second phasers are through a block of low-pass filters connected to the outputs of phase-split, lt, connected by the input to the output of the g-pulse generator through a frequency divider. The drawing shows a diagram of the device. The device contains a pulse generator 1, a frequency divider 2, a phase splitter 3, low pass filters 4-6 first 7 and second 8 phase shifters, first 9 and second 10 pulse drivers, counter I, comparison unit 13, setting register 13, phase detector 14, module the torus 15, the amplifier 16, the engine 17, the first 18 and the second 19 compensation mechanisms, and the filters 4-6 form a block of 20 low-pass filters. The device works as follows. The high-frequency oscillations of the generator 1 are fed to the information input of the counter 11 and the divider 2, the Phaser 3 forms from the rectangular oscillations that are at the output of the divider 2, the rectangular pulses are phase-shifted by 120 °. Filters 4-6 are separated from the sequences of rectangular pulses of the main harmonic voltage, which are used to power the stator windings of phase shifters 7 and 8. The voltages from the rotors of phase shifters 7 and 8 enter shapers 9 and 10, where the voltage of the sinusoid is limited, differentiated and formed, resulting in a phase pulse. The pulse of the phase shifter 1 is fed to one of the two inputs of the detector 14, to the second input of which a pulse from block 12 is applied. The task of block 12 is a bitwise comparison of the binary code contained in register 13 with the continuously increasing counter code 11. At the moment of code equality unit 12 provides a pulse to the phase detector 14. The detector 14 generates a voltage either of positive polarity (if the phase pulse follows the comparison pulse) or negative (if the phase pulse follows the comparison pulse). The voltage from the output of the detector 14 is modeled by the modulator 15 into a sequence of spurious modulated pulses, the duration of which is proportional to the error signal (voltage from the output of the phase detector 14), is amplified by the amplifier 16 and fed to the motor 17, which rotates the rotor of the phase shifter until The impulses are not the same as the phase ones. The pulse of the phase shifter 8 resets the bits of the counter 11 to “O, then under the action of the counting pulses produced by the generator 1, the binary code in the counter 11 again increases. Thus, the counting in the counter 11 starts with respect to the reference pulse, which is produced by the driver 10. Considering that the rotor of the phase shifter 8 is connected to the compensation mechanism 19 installed on the grinding machine, the reference pulse shifts as the grinding wheel wears and thereby compensates for the processing error caused by wheel wear . The use of this device greatly improves the accuracy of the parts on the grinding machine. Claims An apparatus for software control of a grinding machine, comprising a phase splitter and a pulse generator connected in series, a counter, a comparison unit connected by other inputs to the outputs of the master register, a phase detector, a modulator, an amplifier and a motor connected via the first compensation mechanism to the rotor winding of the first a phase shifter, the output of which is connected to the second input of the phase detector through the first pulse shaper, characterized in that, in order to increase the accuracy device, a second compensation mechanism, a frequency divider, a low-pass filter unit and a second phase rotator and a second pulse generator, whose output is connected to the “reset counter” input, the rotor winding of the second phase rotator, are connected to the second compensation mechanism, and the stator windings of the first and the second phase shifters through the low-pass filter block are connected to the outputs of the phase splitter connected by an input to the output of the pulse generator through a frequency divider. Sources of information taken into account during the examination 1. USSR author's certificate No. 550622, cl. G 05 B 19/18, 1975. 2. USSR author's certificate number 159339, cl. G 05 V 11/01, 1961 (prototype).