SU963698A1 - Apparatus for monitoring cutting tool - Google Patents

Description

The proposed device relates to the field of metal cutting and can be used to control the cutting edges of the tool on metal-cutting machines.

Devices for monitoring the cutting tool are known, comprising a photodetector, a peak detector, control and memory units, a tooth counter and an interface unit 1.

The disadvantage of such devices is their low processing accuracy and low reliability.

The aim of the invention is to increase the availability and noise immunity of the device, simplifying the design.

Pel is achieved by introducing a delay element, a filter and a serially connected driver, a controlled one-shot, a first and second valve, and a controlled generator, the input of the driver being connected to the output of the photodetector, and the first output of the controlled generator connected to the second input the first valve, the second output through the filter is connected to the second input of a controlled one-oscillator, the output of which is connected to the second input of the second valve through a delay element, and the output of the second valve is connected to the first input of the control unit nor,

the second input of which is connected to the output of the shaper.

The drawing shows a block diagram of the proposed device.

5 The device contains a photodetector 1, a peak detector 2, a memory block 3, an interface block 4, a control block 5, a teeth counter 6, a driver 7, a controlled one-shot 8, a fan 9 and 10, controlled

10 And generator, element 12 delay and filter 13.

The device works as follows.

Before you start from block 5

15, the control in counter 6 of the teeth is entered into a code corresponding to the number of teeth of the tool, then the rotating tool is introduced into the measurement zone so that the cutting edges of the teeth block the beam

20 light source across the width. At the same time, at the output of the photodetector 1, the pulses with an amplitude corresponding to the dimensional wear pass through the area x1 of the measurement zone of the teeth, and the downstream generator

25 7, representing the Schmitt trigger - rectangular pulses. Using the one-shot 8, the pulses are delayed by a time equal to half the follow-up period of the adjacent pulses that have been formed when appearing in the measurement zone

corresponding adjacent normal (without cleaved marginal capacity) teeth. To ensure the functionality of the device for any combination of the angular velocity of rotation of the tool and the number of teeth, the delay time automatically varies depending on the frequency of the output pulses of the former.

From the output of the one-shot 8 pulses through gates 9 and 10 are fed to the inputs of the control unit 5 and the controlled generator 11, which contains storage capacitors with charge-discharge circuits and threshold elements. The generator is constructed so that the period following its output pulses is equal to the minimum duration of time between the input pulses. Therefore, in order to fine tune the generator to a frequency that corresponds to a specific combination of the number of teeth and the speed of rotation of the tool, two teeth with permissible wear are enough, arranged one after the other. In this case, the device provides the possibility of detecting the limit wear or cleavage of all the other teeth, since the CYCLE of measuring each 3} ba is performed using synchronizing emulsions produced by the generator I, which are added to the pulses from the one-vibrator 8 on the valve 9. With the help of delay element 12 the priority of the latter by delaying the time of blocking the valve 10 to eliminate unmanaged operation and the possibility of accumulating the formation of the synchronization period in the generator 11. From the second On the generator output, the signal through the filter 13 is fed to the control input of the one-shot 8. In this case, the delay time varies depending on the frequency of the generator pulses.

In the pulse measurement mode of the imaging unit 7, the control unit 5 gates the peak detector 2, the output of which, after the passage of each pulse from the photodetector, generates a signal corresponding to its maximum amplitude. Upon receipt of the sync pulse from the output of the valve 10, the control unit forms a command to overwrite information from the picdetector 2 into the memory block 3 at the address.

set by the counter 6 teeth, and the command to reduce the counter content by one. If there is no impulse {essa from the output of the photodetector 1, the zero code will be written to the tooth address with chipping or wear of an inadmissible value using the sync pulse, the generator post from the AND generator through gates 9 and 10 in the memory block 3. With this, the contents of counter 6 will decrease by one. After all teeth are measured and the counter 6 is reset, the command from control block 5 reads data from memory block 3 into interface block 4 and locks the remaining elements.

A device for controlling the cutting tool contributes to an increase in processing performance by reducing the auxiliary time for servicing and preparing the equipment, the degree of automation, and the quality of processing.

Formula of invention

A device for monitoring the cutting tool containing a photodetector, a picdetector, control units and a meter, a teeth counter in the interface unit, which is so that, in order to increase the reliability and immunity of the device, to simplify the design, an element is introduced into it delays, a filter and a serially connected shaper, a controlled one-shot, a single and a second wave, and a controlled generator, the thresholder input connected to the photodetector output, and the first controlled generator output connected to the second Odom first gate, the second output of the filter - with a second input of controllable monoflop whose output is connected via a delay element to a second input of the second gate, and the output of the second gate - to the first input of the control unit, the second input of which is connected to the output of the shaper.

The source of information irinigated when examining:

1. “Beitrag zur Lagemsung aller Schneidkanten an Fraswerkzeugen. “Werkstatt und Betrib, 1976, 109, K ° 3, s. 183-192.

Claims (1)

Claim 25 A device for monitoring a cutting tool, comprising a photodetector, pickdetector, control and memory units, a tooth counter in an interface unit, which, in order to increase the reliability and noise immunity of the device, simplify the design, a delay element, a filter are introduced into it and serially connected shaper, controlled one-shot, first and second 35 gates and a controlled generator, the input of the former being connected to the output of the photodetector, and the first output of the controlled generator connected to the second input of the first valve, the second output through 40 filter - with the second input of the controlled single-shot, the output of which through the delay element is connected to the second input of the second valve, and the output of the second valve is connected to the first input of the control unit, the second input of which is connected to the output of the driver. Source of information taken into account during the examination: 1. "Beitrag zur Lagemsung aller Schneidkanten an Fraswerkzeugen." Werkstatt und Betrib, 1976, 109, No. 3, s. 183-192.