SU826281A2 - Device for programme-control of metal-working machine tools - Google Patents

Description

Theophanying of fires to the homomagik, in particular to devices for the software control of the sword with cutting machines, According to the basic author. St. No. 6414О5, a device for gpogram control of metal cutting machines is known, comprising a series-connected main motion, a power sensor; the first 6L (compare and drive the power control unit, the output of which is connected to the second input of the first compression comparison, logic block and series-connected pulse generator, digital-to-analog converter, second comparison and trigger, the output is connected to the second input of the digital-analog converter, and the second input to the code of the lotus block and the third input of the python-analog preofazovatelya, the output of which is connected to the third input of the first comparison unit, the output of the power sensor is connected to the second input of the WTO horn o Comparison unit i}. When plunging to eliminate tool breakage, a feed is entered from the limit, the value of which is excluded from consideration of the cutting mode, tool parameters and the workpiece. As a result, the CKOpocipbi moves the mechanism in areas without cutting and In addition, with a sharp increase allowance may be a tool or a mechanism. To eliminate these drawbacks, it is necessary to increase the speed of the device for programmed control of cutting machines who increase allowance that allows to increase the supply limitation, according 9nno machine productivity and tool life. . Isophotenic Objective — Duplicate the speed of a device. This objective is achieved by inserting a third comparator unit, a fourth comparator unit, and a unit in series into the known device.

keys, the first output of which is connected to the first input of the comparison unit, the second output to the first input of the third comparison unit, and the third output to the second input of the fourth block is compared to n, the third input of which is connected to the output of the power input, and the fourth input to the second input the third unit of comparison and the second output of the first unit of comparison.

The drawing shows a block diagram of the proposed device.

The device contains a main motion drive 1, a power sensor 2, an array picker 3, a first comparison unit 4, a drive 5 is supplied, a second comparison block 6 is a pulse generator 7, a digital-to-analog converter 8, a trigger 9, a logical block 1О, a third comparison 11, the fourth comparison unit 12 and the key block 13.

The device works as follows.

In the idle mode of the drive 1, at the output of block 4, a signal is generated, which is the apparent power or cutting power, which is zero. In this case, a positive signal is received from the signal of block 11, which is greater in magnitude of the negative signal from the code behind the sensor 3, at the input of block 12, at the output of which a signal of negative polarity appears. In this case, using block 13, a signal corresponding to the power of the incision is ensured at the input of block 11, at which the tool is safe, and in block 4 the integrating capacitance selected from the conditions for ensuring stable operation of the device is disconnected from the integrator whose input signal is the signal difference specified and actual cutting power, and is connected to a discharge resistance.

When plunging into the product, as soon as the cutting power signal from the block 4 code exceeds the signal, the ria signal applied to the 111 input to its output will become zero, and the output signal from the block 12 will change its waveform by a negative signal from the output of the unit 3. l {fnost, thereby betraying the state of block 13.

In blSce 4, the capacity of the integrator is connected, the level of the signal at the input of block 11 is reduced, which is necessary to reduce the likelihood of an oscillatory process, and at the input of block 12

a signal is received that corresponds to the maximum allowable excess of cutting power.

Connecting to the integrator a previously discharged integrating capacitance leads to a sharp decrease in the voltage at its output and, accordingly, at the output of unit 4 almost to zero and a subsequent smooth increase in voltage as the capacitance charges, which leads to a forced reduction in supply, i.e. limiting the load on the tool when plunging. Further, the feed amount is determined by the value of the specified cutting power and the size of the machined part allowance.

With a further increase in the signal power cutting unit 11 on the operation of the device does not affect.

With a sharp increase in load, which the device is not able to work out, maintaining the specified cutting power, as soon as the cut power signal at the input of block 12 exceeds the signal from the setpoint generator output by the amount of the signal applied to the input of block 12, the output signal will change it again its frequency and returns block 13 to the state corresponding to the idle mode of the drive 1.

In this case, the capacitance in block 4 is disconnected from the integrator and connected to the discharge resistance, and at the input of block 12 the signal will become zero, which is necessary to reduce the likelihood of an oscillatory process. Disconnecting the integrating capacitance leads to the formation of a decrease in the output voltage at the output of block 4 due to an increase in the integrator's speed and, accordingly, an intensive decrease in feed, thereby reducing the cutting power and, in turn, the load on the tool.

B the moment when the signal of the cutting power becomes equal to the signal from the output of setpoint 3, the polarity of the signal at the output of unit 12 will change again; and will change in turn the state of block 13.

In blShe 4, the integrator's capacity is reconnected, and a signal corresponding to the maximum allowable cutting power is received at the input of unit 12, thereby preparing the device for the next loading of the load.

By reducing the signal l; cutting power to the level of the signal arriving at

input block 11, i.e. to the power level .. idle (tool exit from the part), a positive signal appears at the output of block ll, leading to a change in the polarity of the signal at the output of block 12 and a corresponding change in the state of block 13, thereby preparing the device to subsequent vrvg zshsho.

The use of the proposed allowance further enhances the productivity of the pile by increasing the feed limit, which in turn leads to a reduction in the time spent on the passage of sections without cutting and, accordingly, the time required to process the entire part, and also increases the reliability of the equipment and tool durability by limiting the load on the tool at moments, embedment and cross increase in allowance.

Claims (1)

Invention Formula Device for software control of NOT1Y metal-cutting machines according to auth.St. N 641405, different teM | that, in order to improve the speed of the device, a third comparison module, a fourth comparison block and a key block, the first output of which is connected to the fourth input of the first comparison block, the second output to the first input of the third comparison block, and the third outlet of the second input are entered into it the fourth comparison module, the third input of which is connected to the output of the power setting unit, and the fourth input - with the second input of the third comparison unit and the second output of the first comparison unit. Sources of information taken into account in the examination 1, Copyright Certificate SSHZR number 641405, cl. G O5 19/18, 1977 (prototype).