SU798716A2 - Two-coordinate programme-control system with programme correction - Google Patents

Description

one

The invention relates to automation and computing, in particular to software control systems with recording of a program on a magnetic tape.

According to the main auth. No. 451059, a known two-coordinate program control system with program correction, contains a technological information reading unit, a reference signal reading unit and, along each coordinate, serially connected control information reading unit, deviation detector, drive control unit, drive, feedback sensor, sub | Coupled to the reference signal reading unit, the correction input unit, connected to the deviation detector, the correction value controller, connected in series with the reference sensor o signal, comparison unit, feedback unit, two-channel scaling unit, geometric addition unit connected to the comparison unit, and for each coordinate the correction signs switching units connected to the technological information reading unit, and

the coordinate through the serially connected two-channel scaling block, the blocks for switching the signs of the correction, and the regulator of the correction value are connected to the blocks for the input of the correction of the other coordinate l.

The disadvantage of the system is low dynamic program correction accuracy due to a significant time shift between the control information signals from the outputs of the control information reading blocks to the inputs of the deviation detectors and the correction information signals coming from the outputs of the correction value controller through the input block chains of correction for the period of time the formation of correction signals.

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The purpose of the invention is to improve the accuracy of cHCTeNttj.

The goal is achieved by the fact that a command generator, a speed controller and blocks are entered into the system.

5 records and reads the correction signals, and the blocks for switching the correction signs are connected to the correction value controller via a switch connected to the recording and reading blocks of the correction signals and to the Command Viewer connected to the speed controller.

The drawing shows .blokkhema system.

The system contains control information reading blocks 1 and 2 and a reference signal block 3, deviation detectors 4 and 5, drive control blocks 6 and 7, drives 8 and 9, sensors 10 (and 11 feedback, blocks 12 and 13 of the correction input, two-channel scaling unit 14, blocks 15 and 16 for switching correction signs, correction value controller 17, geometric addition unit 18, comparison unit 19, reference signal setting unit 20, feedback unit 21, correction information reading unit 22 , block 24 of reading correction signals Ktsii, driver 25 commands, speed controller 26 and switch 27

The system operates in two modes in the mode of no-milling, shaping and recording correction signals and-in the milling mode - and reproducing correction signals.

The switching of the operating modes of the system is performed by the driver 25 upon a command to the controller 26 and to the switch 27.

In the absence of milling and forming signal-correcting system, the system works as follows.

The command from the output of the imaging unit 25 turns on the controller 26 at low speed, through the switch 27 connects the outputs of the blocks 15 and 16 to the inputs of the block 23 and disconnects the outputs of the block 24 from the controller 17.

The signal from the magnetic tape comes in blocks 1-3, the output signals of which are received, respectively, on. detectors 4 and 5, and the reference signal through sensors 10 and 11 and blocks 12 and 13 to the second inputs of detectors 4 and 5. If the control and reference signals coincide, i.e. in the absence of movements in the program, the signal from the outputs of the detectors 4 and 5 is zero. From the outputs of blocks 6 and 7 in this case there are also no signals, and the drives do not move.

When a phase shift appears in any of the coordinates in relation to the reference signal at the output of the deviation detector, the corresponding coordinate appears proportional to this phase shift, and the drive control unit of the corresponding coordinate begins to move the drive associated with the sensor in this direction so that the control and reference signals at the inputs of the deflection detector are equal.

If there are displacements along the coordinates, the signals from blocks 6 and 7 are also supplied to the inputs of block 14, from whose outputs they come to the inputs of block 18, which directs the signal to block 19, where it is compared with the sensor signal 20. Deviation signal from the block output 19 through block 21 sets the output value of block 14 to be equal to the reference signal. The magnitude of the reference signal is chosen such as to provide the maximum amount of correction.

From the outputs of block 14, signals arrive through blocks 15 and 16 and switch J7 to block 23.

In the milling and reproducing mode of the correction signals, the system operates as follows.

The command from the imaging unit 25 switches the regulator 26 to a higher speed, through the switch 27 turns off the outputs of the blocks 15 and 16 from the inputs of the block 23 and connects the outputs of the block 24 to the regulator 17.

The signal from the magnetic tape enters the blocks 1,2,3 and 24, the output signal of which is received, respectively, by the detectors 4 and 5. Moreover, the signal from the output of the block 24 goes to the detectors .4 and L through the controller 17, where it is multiplied a certain value and takes the value of the correction signal, and blocks 12 and 13, where it is converted into a proportional shift of the phase relative to the reference signal, and the signal from block 3 goes to detectors 4 and 5 through sensors 10 and 11, where they acquire phase shift relative to the reference signal proportional to the position of the drive , and through blocks 12 and 13, where these phase shifts are summed.

When a phase shift appears in any of the coordinates with respect to the reference signal at the output of the deviation detector of the corresponding coordinate, a signal proportional to this phase shift appears, and the drive control unit of the corresponding coordinate begins to move the drive connected to the sensor in such a direction so that the signals at the inputs of the variance detector are equal. As a result, the drive moves by the amount of programmed movement, if the phase shift relative to the reference signal appears in the control signal, and by the compensation value, if the phase shift relative to the reference signal by fork as a result of a change in the correction value along this coordinate.

Claims (1)

Since the mode of milling and reproducing correction signals. proceeds faster than the mode of missing ± milling and forming correction signals due to different speeds of the magnetic tape movement, while milling, the time shift between the control signal and the correction signal due to the formation time of the correction signals turns out to be significantly less. Due to this, the control accuracy with correction is increased by approximately as many times as the milling and reproducing signals of the correction signals proceed faster compared with the absence of milling and the formation of corrective signals. In addition, the absence of cross-links between the coordinates of the correction channels in the control process allows to increase the speed of the correction devices without compromising the stability of the system and, thereby, further increase the dynamic sensitivity during the correction. The economic effect is achieved by increasing the accuracy of machining parts on machines equipped with a control system and expanding the nomenclature of children’s classes transferred from unified machines to software-controlled machines, and by reducing the cost of tooling by replacing expensive calibrated cutters with cheap non-dimensional and by increasing the durability of the cutters. Claims of the System of two-coordinate program control with program correction according to the author. No. 451059, characterized in that, in order to improve the accuracy of the system, a command generator, a speed controller and blocks for writing and reading correction signals are entered into it, and blocks of switching of correction signs are connected to the controller of the correction value by a switch connected to the blocks of records and reading the correction signals and with the command driver connected to the speed controller. Sources of information taken into account in the examination 1. USSR author's certificate 451059, cl. G 05 19/16, 1972 (prototype),