SU1035567A1 - Machine program control device - Google Patents

Abstract

1. DEVICE FOR THE STANKING SOFTWARE CONTROL, containing the sequentially connected block, determining the step excess, the element AND, the delay element, the pulse counter, the first register, the decoder and the display unit, as well as the series-connected thread-cutting sensor, the interface block, interpol torus and machine drive the second output of the unit for determining the step pitch error is connected to the second input of the interpolator, so that, in order to increase the technological capabilities of the device, The caliper movement sensor, kinematically associated with the machine drive, and the pitch error compensation block, output connected to the input of the pitch error detection block and the third interpolator input, nepBbBvi input - to the output of the H element and the second input of the first register, Q second input - to the output of the delay element, and the third input - to you (L course of the first register. with the joint venture ffi sl

Description

2. The device of claim 1, wherein the step error compensation unit comprises a second register and a third register connected in series, a fourth register and a calculation unit, the second

the input connected to the output of the second register, the third input to the third input. of the pitch error compensation block, and the fourth input to the second 6.rjoKa pitch error compensation.

The invention relates to automation and computing and can be used in numerical control devices for lathes that have the ability to automatically thread the program. A device for programmed control of machine tools is known, comprising a thread-cutting sensor connected in series, an interface unit, an interpolator, a counter, a decoder, a display unit, a step error detection unit, as well as a key, a first trigger, a second trigger, an additional counter, a delay element, and a G17 drive . The disadvantages of this device are the inability to control every thread pitch and, therefore, the impossibility of determining the accumulated pitch error determining the quality of the thread. The closest technical solution to the invention is the arrangement of a software control of a turning machine, comprising a key, a delay element, a counter, a descrambler connected to the outputs of the display unit, and a thread-cutting sensor, an interface unit, an interpolator and a drive, while the second input and output of the interpolator are connected, respectively, with the first output of the block for determining the step error and the first input of the counter. Improving the reliability of the device in operation is ensured by the fact that the first register and the accumulated step error detection unit are entered into it, connected by an output to the input of the step error detection determining unit, the second output of which is connected via a serially connected key and delay element to the second counter input, connected by outputs to the inputs of the decoder through the first register, the second input of which is connected to the output of the key connected by the second input to the second output of the interface block t 2 The device can control in threading mode each step of a threaded passage, output the step size to a digital indication, calculate the accumulated step error and when it exceeds a certain value, specify the cutter output modes from the threaded groove. However, in such a device there is no pitch error compensation; when controlling the pitch, the dynamic errors of the feed drive caused by the uneven rotational speed of the syndels and are not taken into account. errors in programming threading modes, which reduces threading accuracy. The purpose of the invention is to increase the technological capabilities of the device by compensating for the error in the thread pitch and control of the pitch, taking into account the effect of dynamic errors on the drive. The goal is achieved by the fact that in a device for software control of a machine, comprising a series-connected unit for determining the step pitch error, an element AND, a delay element, a pulse counter, a first register, a decoder and an indication unit, and serially connected thread-cutting, cutting, matching unit machine, the interpolator and the drive of the machine, the second output of the unit for determining the step pitch error is connected to the second input of the interpolator, a support displacement sensor is inserted, kinematically connected from the machine drives, and a pitch error compensation block, connected to the input of the block for determining the transducer step error and the third input of the interpolator, the first input to the output of the And element and the second input of the first register, the second input to the output of the element delays, and the third - to the output of the first register. In addition, the step error compensation unit contains a second register and a third register connected in series, a fourth register and a calculation unit, the second input connected to the output of the second register,

by the third input to the third input of the step error compensation unit, by the fourth input to the second input of the step error compensation unit.

FIG. 1 shows a functional diagram of the device for software control of the machine; in fig. 2 - functional block diagram of the entry; in fig. 3 - a functional block diagram for determining the step pitch error.

The device contains a threading sensor 1, an interface block 2, an interpolator 3, a counter 4, a first re, a hyster 5, a decoder b, an indication block 7, a block 8 for determining the error increment, an element 9. (key), delay element 10, machine drive 11, sensor 12 (pulsed) caliper movement, pitch error compensation unit 13, second 14, third 15, fourth 16 registers calculation unit 17 consisting of two adders 18, 19 and converter 20 numbers in additional code with a negative sign. Block 8 contains a register 21 of the minimum step size, a converter of 22 numbers into an additional code with a negative sign, two-input adders, a discriminator 24 of a negative sign, a register 25 of the maximum step size of 5 uyah

Registers 21 and 25 are entered into the minimum and maximum allowable increments of the program or manually from the operator’s console. In adders 23, a pair subtraction of 8e and 5e is performed. If the difference has a negative sign, which indicates that the error of the step of permissible limits is exceeded, the discriminator 24 of the negative sign gives a logical signal O, which prohibits the passage of pulses. And, and simultaneously sets the interpolator 3 modes of outputting the tool from the groove. Both outputs of block 8 are equivalent.

Adders 18 and. 19, the converter 20 is built on the IC chips, PA K155.

Interface unit 2 is designed to accommodate different levels of stresses in the transmission of signals through the cable between the threading sensor and the interpolator logic circuit; The interface block has two output channels; pulses of origin go through the first channel, with a frequency of one pulse per revolution of the sensor shaft; the second channel is followed by a certain number of pulses, proportional to the angle of rotation of the sensor shaft, in the intervals between the starting pulses.

The device works as follows.

Clock pulses from sensor 1, via block 2, arrive at interpolator 3. Depending on the step size specified by the third register 15, interpolator .3 selects a certain number of pulses and outputs them to actuator 11, kinematically connected with pulse displacement sensor 12, pulling out On the counter 4, we measure the measuring pulses of the actual movement of the machine support (not shown), which allows to take into account the dynamic errors of the thread pitch. Impulse The beginning of the countdown from the output of the block 2 of the conjugation enters the input element And 9, from the output of which the impulse arrives at the input Record. register 5 and the element 10, which forms the pulse of reset of the counter 4, delayed relative to the pulse. The counting time, and the delay time and duration of the pulse in total should not exceed the period of the clock pulses of sensor 1. After the end of the action

Start of delayed pulse

This starts the recording of measuring pulses in counter 4, and the subsequent pulse. The starting point of the step value recorded in counter 4 is transferred to register 5. Thus, the contents of register 5 equal to 59 (real step value) are continuously outputted by decoder 6 to the block 7 and simultaneously enters) the input of the converter 20 of the block 17, to the second input of the adder 18 comes from the register 14 the step size specified in the program (Snp), the first input of the same adder from the register 16 receives the step size specified in the interpolator (S3 times the previous thread pitch and recorded in the register 16 by the pulse Start of the next step.When arriving at the fourth input of the delayed pulse device, the beginning of the next step is calculated by the computer compensating for the next thread pitch (v (HT value of the error allowed when cutting the previous step)

, viHT-5tip u5, where: 5e-5 "n-g

The SVIHT value recorded in register 15 goes to interpolator 3 and simultaneously to block 8. When a pulse from the output of element 10 is transmitted to the cutting inputs of the translations of both adders 18 and 19, the sum (5int + pr) appears at the first input of the accumulator 19 and simultaneously at the output of the adder 19, the value is 51, -Sg, enters the register 15 and determines the next thread pitch from

considering the error correction of the previous step ..

Thus, the device prevents the possibility of accumulation of pitch error. In the event of a faulty situation, if the value of certain permissible limits is exceeded, block 8 prohibits the passage of pulses. Start of counting through key 9, and the digital indicator of block 7 shows the indication of the step size at which the failure occurred. At the same time, block 8 sets the interpolator 3 modes for cutting the cutter from the threaded

FIG.

grooves. Compared with the base object (CNC device Mak k-221 according to 1.ADHO.0.0.0.065), the proposed device makes it possible to compensate the measured error of the step of the previous turn of the thread during cutting and subsequent turn, measure the thread step with regard to the dynamic errors of the feed drive, in the case of if the compensated step exceeds certain tolerances of limits, set the cutter output modes from the threaded groove. The use of this device allows to increase the accuracy class of the cut threads.

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Claims (1)

(5.4) 1. DEVICE FOR SOFTWARE MANAGEMENT OF THE MACHINE, containing serially connected unit for determining the excess of step error, element I, delay element, ¹ pulse counter, first register, decoder and display unit, as well as serially connected thread cutting sensor, interface unit, the interpolator and the machine drive, the second output of the unit for determining the excess of the step error is connected to the second input of the interpolator, which is connected with the fact that, in order to increase the technological capabilities of the device, a caliper displacement sensor kinematically connected to the machine drive and a step error compensation unit connected by an output to the input of the step error excess determination unit and to the third input of the interpolator, the first * input "* - to the output of the And element and to the second input of the first register, the second input - to the output of the delay element, and the third input - to the output of the first register.