CS215524B1 - Connection of circuits of the track interpolar - Google Patents

Description

The invention relates to circuit interpolation circuits for machine control systems, in particular machine tools.

Digital position control systems, in particular numerical control systems of machine tools, very often contain an interpolator that allows the generation of a linear or circular motion. Interpolators used so far require a large number of components and achieve relatively low speeds.

Many of these disadvantages are overcome by the wiring according to the invention, which is based on the fact that the output of the information source is connected by the first information channel to the first inputs of the constant memory, counter memory and masking block. through the second information channel, on the one hand with the second inputs of the constant memory, the counter memory and the masking block, and on the other with the first inputs of the accumulator memory and the pulse splitting block, the constant memory output is connected to the first input of the first adder. the first adder is connected to the third input of the counter memory and the first input of the second adder, the second input is connected to the storage memory output, the second adder output is connected to the third · masking block input, the first • masking block output is connected to the second the second output of the masking block is connected to the third input of the constant memory and the second input of the pulse splitting block, the first output of which is connected to the input of the first servo drive and the second output of the pulse distributing block is connected to the input of the second servo drive.

The advantage of the circuit according to the invention is the need for a small number of components and the possibility of achieving a high speed of movement. The advantage of this connection is also the maintenance of tangential speed of movement.

An example of a wiring according to the invention is shown in the figure, which is a block diagram of a circuit interpolator circuit.

The information source 1, usually realized by the input part of the control system, allows entering the desired motion parameters (eg, the path radius generated, path start and end points, etc.) and processing them into a shape suitable for input to the interpolator. The output of the information source 1 is connected by the first information channel to the first inputs of the constant memory 3, the counter memory 2 and the masking block 7. The velocity of the resulting motion is proportional to the output frequency of the pulse generator 11, which may be realized, for example, by an oscillator or an incremental spindle speed sensor. The output of the pulse generator 11 is coupled to the input of the controller 12. The controller 12 generates the address sequence needed for the seri-parallel calculation. For example, the controller 12 may be implemented by a counter. The output of the controller 12 is connected by a second information channel to the second inputs of the constant memory 3, the counter memory 2 and the masking block 7 and to the first inputs of the storage memory 5 and the pulse splitting block 8. The output of the constant memory 3 is connected to the first input of the first adder 4, the second input of which is connected to the output of the counter memory 2. The output of the first adder 4 is connected both to the third input of the counter memory 2 and to the first input of the block of the second adder S, the second input of which is connected to the memory output 5 of the accumulator. The output of the second adder 6 is coupled to the third input of block 7 masked. The masking block 7 is connected to realize the function of the logical product of the number indicating the set addition module and the result of the sum of the contents of the storage memory 5 and the counter memory 2. This function can be realized eg by logic gates. The first output of the camouflage block 7 is connected to the second input of the storage memory 5. The second output of the masking block 7 is connected both to the third input of the constant memory 3 and to the second input of the pulse splitting block 8. The pulse splitting block 8 determines according to the address value generated by the controller 12 to which axis the output pulse is supplied. It also adjusts the duration of the output pulse. The first output of the pulse-distribution block 8 is connected to the input of the first actuator 10. The second output of the pulse-distribution block 8 is connected to the input of the second actuator 9. The actuators may be realized, for example, DC motors with controller and metering device.

Claims (1)

SUBJECT Circuit interpolator circuit wiring characterized in that the output of the source (ij of information is connected by the first information channel to the first inputs of the memory (3j of the constant, memory (2) of the mask and block (7)), the output of the pulse generator (11) 12], the output of which is connected by a second information channel to the second inputs of the memory (3) of the constant, the memory (2) of the counter and the masking block (7) and the first inputs of the memory (5). the constant memory (3) is connected to the first input of the first adder (4), the second input of which is connected to the output of the counter memory (2), the output of the first adder (4) is connected both Before the movement begins, the input geometry data is overwritten from the input source 1 (in the case of linear interpolation, the difference between the coordinates of the end point and the starting point, in the case of circular interpolation the coordinates of the starting point relative to the circle center) to the memory 2. In addition, the module of the second adder 6 is set via masking block 7. In each calculation step, a corresponding value (zero, -j-1, or -lj from the 3 constant memory) is added to the contents of the counter memory 2 by the first and the result is again stored in the counter memory 2. In addition, this result is summed via the second adder 6 containing the storage memory 5 and the result is stored in the storage memory 5 via the masking block 7. The masking block 7 changes the module of the second adder 6 according to size. entered paths (lengths of acc If the addition result in the second adder 6 is larger than the set addition module, the masking block 7 generates an output pulse that is fed to the pulse splitting block 8 and at the same time affects which value (0, + + 1 or —lj will be selected from the 3 constants memory in the next step. The output pulses of the masking block 7 are applied to the pulse inputs of the autonomously operating actuators 9, 10 of the individual coordinate axes by the pulse-splitting block 8. The control pulse generator 11 generates a pulse train at a frequency proportional to the desired speed of movement. The controller 12 generates a periodically repeating address sequence of the memories 2, 3, 5 of the masking block 7 and the pulse distribution block 8. At the same time, it generates the control signals required for the interpolator function. The invention is particularly applicable to control systems of machine tools. OF THE INVENTION with a third memory input (2J), first with a second input of the second adder (6), the second input of which is connected to the storage memory (5) output, the output of the second adder (6) is connected to the third input of the masking block (7) the output of the masking block (7) is connected to a second input of the storage memory (5), the second output of the masking block (7) is connected to both the third input of the constant memory (3) and the second input of the pulse distribution block (8). it is connected to the input of the first actuator (10) and the second output of the pulse splitting block (8) is connected to the input of the second actuator (9).