SU1153268A1 - Device for checking dullness of cutting tool - Google Patents

Description

1 The invention relates to measuring wear of cutting tools and can be used to automate the cutting process on automatic machines and machine tools with numerical program control. The purpose of the invention is to improve accuracy. The drawing shows a block diagram of the device. The device contains successively connected vibration sensor 1, amplifier 2, filter 3 and detector 4, successively connected coincidence circuits 5 with two inputs, counter 6 imp. The digital readout block 7 and the serially connected sensor of the billet, amplifier limiting device 9, trigger 10 with a circuit input and one-shot 11. The device is equipped with two circuits 12 and 13 coinciding with three inputs, adder 14, NOT circuit 15, second trigger 16 with the counting input, the control unit 17, and the voltage converter 18 are the frequency, the output of which is connected to the input of the circuit 5 coincides with two inputs, and the input with the output of the detector 4, the output of the one-vibrator I1 is connected to the first inputs of the coincidence circuit with three inputs through the circuit 15 E, with the input of the second trigger 16 with the counting input and the input of the control block 17 whose output is connected to the input of the counter 6 pulses and to the fault inputs of two triggers with the counting inputs, the second inputs of the circuits 12 and 13 coincide with the three inputs connected to the single and zero outputs - triggers with a counting input, the third inputs of these coincidence circuits are connected to zero and single outputs of the second trigger with a counting input 5, the output of the coincidence circuits with three inputs are connected to the inlet of the adder I i. The device works as follows. The signal from the vibration sensor I, attached to the instrument, consists of a useful signal proportional to the amplitude of the vibrations of the tool and an interference signal caused by the rotation of the workpiece, is fed to amplifier 682. The signal from the output of amplifier 2 is filtered through filter 3, which separates the frequency spectrum, Carrying information about tool wear, modulated by the frequency of rotation of the workpiece, is converted to a constant voltage by the detector 4 and fed to the input of the voltage-frequency converter 18. Pulses from the output of the voltage converter 18 - the frequency is counted for two time intervals TC, each of which is equal to the duration of the signal from the output of the single-oscillator P, i.e. Both time intervals for counting the pulses from the output of the voltage converter 18 are the same frequency, but they start either from the positive or from the negative half-wave voltage of the vibrations caused by the rotation of the workpiece. . Depending on the amplitude of the interference voltage, the frequency of the pulses from the output of the converter 18 varies, however, the total number of pulses transmitted to the counter 6 C | 4g (: pulses over two time intervals 2T (j, where Tu is the pulse duration of the one-shot P, does not depend on interference, since these intervals begin one with a positive, the other with a negative voltage half-wave, and the duration of the intervals are equal, since they are set by the same one-vibrator 1 1. To start the one-oscillator 11, then with a positive one, then with a negative half-wave The april interference from the rotation of the workpiece in the device uses a matching circuit for three inputs 12 and 13, an adder 14, a second trigger 16, and a sensor 8 measures the number of half-turns of rotation of the workpiece. The half-turns of rotation pulses generated by the amplifier-limiter 9 are fed to the trigger input 10 with a counting input. The first pulse triggers trigger 10, and through the open circuit 13 matches and the adder 14 triggers a single vibrator 11, which opens the circuit 5 matches, and pulses from the code of the converter 18 during the first time interval T. pass on the counter 6 pulses. In this case, the one-shot I1 is in the actuated state, the circuits 12 and 13 of the match are closed by the signal from the output of the circuit 15 NOT. At the end of the pulse

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one-shot. (its falling front} the trigger 16 is cocked, and the coincidence circuit 12 is removed from its single output signal, and the coincidence circuit 13 closes. Therefore, the one-time pulse 11 is recharged by an even pulse of the half-wave voltage from the rotation of the rear ground.

532684

Therefore, after counting by the counter 6 pulses from the output of the voltage to voltage transducer of the single vibrator 5 in the two time intervals 2 ′ of the one-shot 5, the effect of interference from the workpiece rotation is eliminated and the results do not depend on the change in the rotational speed of the workpiece and the machine.

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Claims (1)

DEVICE FOR CONTROL OF BLOWING OF A CUTTING TOOL, comprising a vibration sensor, an amplifier, a filter and a detector, a coincidence circuit with two inputs> to <in series, a pulse counter and a digital readout unit, and a workpiece speed sensor, a limiter amplifier, a first trigger with a counting input and a one-shot, characterized in that, in order to increase the accuracy of control, it is equipped with two with the input of the second trigger with a counting input and input of the control unit, the output which pulse counter connected to the input and to the reset input of the two flip-flop input, _Λ second input matching circuits with three 5 and the origin of these inputs are connected to unit vym outputs of the first flip-flop input, a third input matching circuits are connected with zero and unit outputs the second A trigger with a counting input, the outputs of the coincidence circuits with three inputs are connected to the input of the adder, the output of which is connected to the input of a one-shot. Ci SB to □ 5 00