SU805259A1 - Programmable machine controller - Google Patents

Description

380 on a digital scoreboard, which makes programming, monitoring, performance slow down and leads to errors and defective parts. The purpose of the invention is to simplify the device and increase its accuracy. The goal is achieved by the fact that the device for software control of the machine, containing its caliper starting position sensor, caliper moving pulse sensor, control unit and computing unit, the first input of which is connected to the output of the first program master, and the second input to the first low-order output of the reversible counter and with the first input of the higher bits of the reversible counter, under the second input to the output of the computing unit, and the outputs to the first inputs of the indicator and the equivalence element, the second input which are connected to the second outputs of the low-order bits of the reversible counter, the third input of the equivalence element connected to the output of the second program master, and the output to the input of the feed drive control unit, additionally contains a register, AND, OR, and Prohibition elements controllers of the program, whose inputs are connected to the output of the feed control unit and the outputs to the third input of the equivalence element, the first input of the lower bits of the reversible counter is connected to the output of the t, and the second input of the lower ones, also the third input of the higher bits of the reversible counter — with the output of the first element I, the first input of which is connected to the first input of the device, the second input to the output of the fourth program master, and the third input to the output of the caliper initial position sensor and to the first input of the OR element connected by the second input to the second input of the device, and the third input to the output of the element of equivalence and the first input of the Ban element, the second input of which is connected to the output of the pulse displacement sensor supp type and to the first input of the second element AND, connected by the second input to the output of the OR element, and the output to the input of the control unit. FIG. 1 is a block diagram of the device; in fig. 2 - diagrams of his work, where a - areas of programming movements at high speed and working feeds, b - definition of deviations. The device (see Fig. I) contains the element "Inhibit 1, reversible counter 2 with younger 2 and older 2 bits, computing unit 3, indicator 4, equivalence element 5, control unit 6, pulse caliper movement sensor 7, control unit 8 feed drives, the sensor 9 of the initial position of the caliper, the first element AND 10, the element OR AND, the second, the element AND 12, the register 13 and the first 14, the second 9 15, the third 16 and the fourth 17 setting programs. The device works as follows. In each simple cycle, two zones are defined: an area equal to the value j.) Of the free run of the tool i-ro from the initial position of the caliper to the beginning ("O) of the part being machined (i.e. from. To" O) and an area equal to the value (Zi ) of the part being machined by the i-th tool (i.e., from "O to -Zv), where the position of the coordinate" O changes at each stage, and when the caliper returns to its original position, the opposite change of the coordinate values is performed (from + AoDo " O and from "O to-Zi), and the control is performed at the end of each cycle according to the sum of the given (h) and real (e) C Displacements that are compared with the predetermined absolute value / 2 / of their allowable deviation {(Ala-Zls) - (Aid + Zie)) / 2 |, with / X / being counted from the moment when the caliper passes the initial position to the moment when the coordinate reaches the value of Ai, or vice versa. In the initial state (Fig. 2), the workpiece blank is clamped in the cartridge, the caliper is retracted in the extreme position. Each of the stages is processed in its programmable simple cycle by the corresponding cutters 18 and 19. The simplest cycle includes the following movements: high speed, working feed, retraction at high speed to the initial position of the caliper. The programming is carried out as follows. The caliper is in the starting position. When fixing their heads, tools 18 and 19 occupy some arbitrary position along the axis of displacement. Set the processing sequence: first with part 18 - part stage 18i and then with tool 19 - part stage 19i. In the initial position of the caliper, when operating with the tool 18, the counter 2 is installed. The caliper is then brought to the part until the tool touches the end face. On the display of the indicator 4, the value A is counted and dialed on the setting device 17. According to the part drawing or after passing the incisors of the part section 18i, the value Z is set on the setting device 16 (FIG. 2). Similarly, the values of Ar are set. and zj. for tool 19. At setters 14 and 15, the absolute value of the CjcH CA lead values in zones Z is set constant for all processing steps; and AV. The work cycle for tool 18 is that the stage distributor

The processing included in the program input block (not shown in the drawing) and controlled from block 8 is set to the stage corresponding to the programmed processing by tool 18. At the command “Start Caliper from its initial position, it starts the movement“ For me ”. In this case, the sensor 9 is triggered and the value AI is entered into the counter 2 through the element AND. At rapid speed, the caliper moves, working off the coordinate A (, to "O (see Fig. 2). Non revenue to zero, when the value of Cd in the counter 2 is reached, from block 5 of equivalence the signal arrives at block 8 to decrease the speed of the fast caliper. Upon reaching "O, the speed switches to the working feed. The element of the movement cycle ends in zone Aj. And the coordinate in the ZL zone starts to work from" O to the value Zj .. During operation, the number of pulses from block 3, equivalent to the specified one, is added (subtracted). on sensor 7 Cj. Achieved and the value of the sensor distance is 7 ° C; element 5 is activated from the specified value of testing Zi (at this moment the sensor 7C pulses are added to the number accumulated in counter 2 and it becomes equal to Zi). At the indicated moment of equivalence, the working feed decreases for working out the Z coordinate. At the completion of its working out, the caliper, at the command of block 8, rushes backwards ("from the part). In counter 2, the coordinate changes from -Zi to" O "and from" 0 to L. On return, the block used control of correctness heel for all stages of the cycle the tool 18. The control is performed modulo the total displacement

{(A, s -f Zij) - (A, a + z, a)} $ / z /,

where is AU; Ai3 and Zo; - specified and actual values of the coordinates of mining in zones AJ and Zi.

When returning, two cases are possible (Fig. 26): the moment of equivalence of AI with the number in counter 2 comes earlier or after a command from sensor 9. In any case, the element AND 12 is opened through the OR AND AND element and the register 13 starts counting the input pulses. In case of equivalence on Af, a ban is applied on element 1 and the counting on counter 2 stops. The number AI remains there regardless of the overrun of the carriage. By the same signal of equivalence, the feed drive from block 8 stops. If during the passage of the support of sensor 9 began in register 13, a number less than the specified number has accumulated, then a resolution is obtained to continue the work of the next stage. The position of the turret changes to the position of the tool 19 and a new cycle begins, similar to the first one. In case the number in register 13 turns out to be more than the permissible (beforehand given) value - / 2 | f, then the control unit 6 will prohibit further work on the program.

The proposed device can significantly simplify the programming process, improve the accuracy and processing performance.

ten

Claims (2)

1. Gorodetsky MS and others. Numerical program control of metal-cutting machines. M., NIIMASH, 1970, p. 43. 2. USSR author's certificate No. 309352, cl. G 05 19/18, 1969 (prototype).