SU1364857A1 - System for measuring accuracy of positioning machine units - Google Patents

Abstract

The invention relates to a measuring technique and can be used in machine building and instrument making, for example, in the machining of parts on machine tools with numerical control (CNC). The aim of the invention is to enhance the functionality of the measuring system by ensuring the accuracy of the control positioning in a dynamic mode. With

Description

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moving the monitored node from the output of the measuring transducer 1 receives a signal about the magnitude and direction of movement. The normalizing transducer 2 generates a sequence of pulses at the pulse output, the number of which is proportional to the displacement. The pulses accumulate in the data accumulation unit 3 and are compared in the comparison unit 7 with the specified storage unit 6 values. In case of equality of codes at the inputs of block 7, it carries the signal arriving at the input of block 8 of control. Control block 8 permits the switch 4 to transmit pulses from the code of the normalizing converter 2 to the input of the accumulation unit 10 of the absolute value of the error. Unit 10 is operating in addition mode. The pulses go to block 10 until the mobile

The node does not reach the specified position and the CNC command does not stop. If the stop command arrives earlier, then the control unit 8 through the switch 4 connects the high-frequency generator 5 to the inputs of blocks 10 and 3 and the buffer accumulator 9. At the same time, block 10 operates in the subtraction mode, blocks 3 and 9 - in the addition mode. After alignment of the codes at the inputs of the comparison unit 7, the last impulse, according to which, the control unit 8 commands the switch 4 to block the input of the block 10, and blocks 3 and 9 switch to the subtraction mode. The input of pulses to the inputs of these blocks is stopped when zero is produced at the output of the buffer accumulator 9. If the set tolerance is exceeded, the tolerance control node 11 generates warning signals. 1 il.

The invention relates to a measuring technique and can be used in machine and instrument making, for example, in processing parts on numerical control (CNC) machines.

The purpose of the invention is to expand the functionality of the measuring system by providing the possibility of monitoring the accuracy of positioning in a dynamic mode of operation and operational tolerance control.

The drawing shows a block diagram of the system.

The system for measuring the positioning accuracy contains the displacement transducer 1, rigidly connected to the monitored mobile unit, connected to the transducer 1 normalizing transducer 2. The pulse output of the normalizing transducer 2 is connected to the information inputs of the data accumulation unit 3 and switch 4 to the second information transducer in which the high-frequency generator of 5 impulses is connected.

The system also contains a storage unit 6 connected by an input and an output to the comparison unit 7, the other input of which is connected to the output of the data storage unit 3. The output of the comparator unit 7 is connected to the first input of the control unit 8, which is connected with the outputs to the data storage unit 3, the switch 4, the buffer store 9, the accumulation unit 10 of the absolute value of the error. Unit 10 one of the inputs connected to the switch 4, and the output with node 11 tolerance control, which is equipped

light 12 and sound 13 signaling devices.

The device works as follows.

When moving the controlled

The mobile unit from the output of the measuring transducer 1 receives a signal that carries information about the magnitude and direction of movement. The normalizing converter 2 at the pulse output outputs a sequence of pulses, the number of which corresponds to the magnitude of the displacement, while the constant potential

The second output of the normalizing converter 2 characterizes the direction of movement.

In data storage block 3, the accumulated value is accumulated and indicated. This value in the comparison block 7 is continuously compared with the value stored in the storage unit 6. When equalizing the codes of numbers at the inputs of the comparison block 7, a pulse is generated at the output of the memory block 6. The same pulse arrives at the first input of the control block 8, which, on the second exit, provides the permission for the switch 4 to transmit pulses from the output of the normalizing converter to the input of the accumulation unit 10 of the absolute value of the error. The pulses arrive before the moving position of the machine reaches a predetermined position and / or issuing an NC command to stop. In this case, the control unit 8 provides

for block 10, the addition mode.

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If the command to stop the machine comes before the codes of numbers on the inputs of the comparison unit 7 are equalized, then the control unit 8 is controlled by the functionality awareness.

the switch 4 connects the output of the high-frequency generator 5 to the inputs of the accumulation unit 10 of the absolute error value, the data accumulation unit 3 and the buffer storage unit 9, the unit 10 operating in the subtraction mode and the units 3 and 9 in the addition mode.

After the adjustment of the codes at the inputs of the comparison block 7, an impulse is issued by which the control block 8 gives a command to lock the output of the switch 4 connected to the block 10, and at the same time changes the counting direction in blocks 3 and 9 for subtraction. The input of pulses to the inputs of these blocks is stopped when it reaches zero in the buffer accumulator 9. At the same time, a zero pulse arrives at the second input of control unit 8 and locks switch 4. These operations allow to restore the actual movement value in data accumulation unit 3.

If at any of the positioning points the absolute value of the error in block 10 exceeds the set tolerance value specified in the node 11 of the tolerance control, the node 11 of the tolerance control issues signals to the light 12 and audible 13 signaling devices.

Claims (1)

Invention Formula A system for measuring the positioning accuracy of moving parts of machines, comprising a chain of serially connected measuring transducer, normalizing transducer, data accumulation unit, comparison unit, control unit, the first output of which is connected to the second input of the data accumulation unit, the storage unit whose output is connected to the second input the comparison unit, the output of the comparison unit is associated with the output of the storage unit and the first input of the control unit, characterized in that, in order to expand 0 five 0 it is equipped with a switch, an absolute value accumulation unit, a buffer store, a high-frequency generator, a tolerance control node, the first, second and third inputs of the switch are connected to the outputs of the normalizing converter, high-frequency generator and the second output of the control unit, the first switch output is connected to the input of the block the absolute value of the error, the second to the third input of the data accumulation unit, the third to the first input of the buffer accumulator, the second input which is connected to the third output of the control unit, the output to the second input of the control unit, the third input of which is connected to the second output of the normalizing converter, the second input of the accumulation unit of the absolute error value. connected to the fourth output of the control unit, and the output to the node of the tolerance control.