SU1284740A1 - Apparatus for automatic pattern cutting of blanks in on-the-fly cutting machine - Google Patents

Abstract

The invention relates to automatic control systems in the rolling industry and can be used in drive control systems of a volatile cutting mill. cutting production of moving blanks. The purpose of the invention is to improve the cutting accuracy of the blanks and reduce metal waste by introducing new blocks and functional connections, which allow automatically calculating the actual price of the pulse of the displacement sensor of the workpiece and agree on the cutting speed and position with the specified cut points. Using the carriage movement sensor of a volatile cutting machine as an exemplary displacement meter, d. T, automatic calibration of the workpiece displacement sensor with the elimination of two sensors controlling the control movement, receiving pulses, the number of which is strictly proportional to the measured movement, minimizes the measurement error of the movement of the workpiece, which allows Improves cutting accuracy and minimizes metal waste. 1 il. a (lu po; a 4ib

Description

The invention relates to automatic control systems in the rolling industry, namely to a control system for a drive of a volatile cutting machine that produces cutting of moving blanks.

The aim of the invention is to improve the accuracy of cutting blanks on a volatile cutting machine and reduce metal waste.

The drawing shows a functional diagram of the device for automatic cutting of blanks on a volatile cutting machine.

The device contains a workpiece 1, a pulse sensor 2 of movement of the workpiece 1, connected to it through a measuring roller 3, a volatile cutting machine with stan. 4 and a movable carriage 5 fixed on the carriage 5 with cutting heads 6 and 7, the mechanism 8 for clamping the workpiece with sensor 9 the final position of the mechanism 8, as well as the diverting groove 10, supported by the outlet roller conveyor 1I, the cut off workpiece 12, the rack and pinion gear 13 connecting the

After coordinating the speed of the position of the carriage 5, namely, the heads 6 and 7, with the specified cut points on the moving workpiece 1, produced by the system 16, the complete clamping of the workpiece using the mechanism 8, the sensor 9 outputs a pulse signal to the R inputs . The sensor 19 and 21, as well as the trigger 22. In this case, the counters 19 and 21 are zeroed at the inverse output of the trigger 22 at

motor 14 with carriage 5j pulse sensor 15 for moving the carriage so the logical unit, ki 5, connected to the shaft of the electric motor 14, the motor control system 16 of the carriage 5, and also the computing unit 17, which includes the logical element And 18, binary n -discharge counter 19 with outputs denoted 1,2,4, 8, .. ,, respectively, the price of a logical unit in each bit, frequency divider 20 with a variable division factor, with a counting input T and inputs setting the factor 35

40

incoming to the second input element 18.

From this moment, the received start of the cycle of operation of the device, begins the calculation of the actual price of the pulse of the displacement sensor 2. Each signal 1 coming from the output of the sensor 15 is moved by the carriage to the first input of the element 18 and produces a signal 1 during the course of this element. These signals are considered pulses as counter 19. At the moment, the pulses emitted by the switch 2 of the workpiece movement are counted by counter 21. At the moment the counter 21 is transferred with the number 2 from the output to the input S of the trigger 22, it produces a pulse.

1 2 4 in accordance with Imta numbers, denoted by V,

ttp-1

   2

pulses produced by the divider 20 when applying to its input T 2 pulses, to the corresponding input of the setting of the coefficient - a logical unit, and to the remaining such inputs - by logical zero, the counter 21 of the specified

the numbers 2 and the trigger 22. Moreover, the first input of the element AND 18, which is the first input of the block 17, is connected to the output of the pulse sensor 15, a. the second input element 18 is connected to. the trigger output 22, the output of the element 18 is connected to the counting input T of the counter 19, the outputs I, 2,4,8, ..., which are connected to the inputs V ,, V2, V,

fO

five

divider 20 respectively f5

20

25

UP-1 2

but, the output of the pulse sensor / is connected to the counting inputs of the divider 20 and the counter 2I at the second input of the block 17, the output of the counter 21 is connected to the trigger input 22, the output of the sensor 9 is connected to the reset inputs R to the zero state of the counters 19 and 21, as well as the trigger 22 at the third input of the block 17. The output of the splitter 20, the output of the block 17, and the output of the carriage motion sensor 15 are connected respectively to the first and second inputs of the carriage motor control system 16.

The device works as follows.

After negotiating the speed. the position of the carriage 5, namely, the cutting heads 6 and 7, with specified cut points on the moving workpiece 1 produced by the system 16, and complete clamping of the workpiece using the mechanism 8, the sensor 9 outputs a pulse signal to the inputs R of the counters 19 and 21, as well as flip-flop 22. At the same time, the counters 19 and 21 are zeroed out, and a logical unit is generated at the inverse output of flip-flop 22,

Logical unit is generated,

five

0

five

0

five

arriving at the second input element And 18.

From this moment, taken as the beginning of the device operation cycle, the calculation of the actual price of the impulse sensor 2 of the workpiece movement begins. Each signal 1, coming from the output of the sensor 15 for moving the carriage to the first input of the element 18, produces a signal 1 at the output of this element. These signals — pulses are considered to be counter 19. At the same time, pulses emitted by the workpiece displacement sensor 2 are considered counter 21. At the time the counter 21 overflows with number 2, a pulse is output from its output to input S of flip-flop 22.

At the same time, on the inverse output of the trigger and on the second input of the element I 18 connected to it, O is set O, which prevents further arrival of the pulses at the input of the counter 19. The calculation of the actual price of the pulse of the sensor 2, which takes some time t,, ends. The result of the calculation is the number A accumulated in the counter 19. This number is proportional to the average for the time t (the actual

the price d (p, of the pulse of the sensor 2, is set at the inputs of the setting of the divider coefficient 20 as a combination of logical zeros and ones.

From this point on, for the time tj until the end of the operation cycle of the device, the pulses of sensor 2 are transformed by a frequency divider 20 into pulses with a reference price (j equal to the price of a pulse of sensor 15, the constant of which is provided by connecting the sensor 15 to the carriage 5 gear transmission 13.

The number and frequency of the pulses emitted from the output of the divider 20 to the output of the computing unit 17 and from it to the first input of the system 16 measure, respectively, the path and speed of movement of the workpiece 1, while the number and frequency of the pulses emitted by the sensor 15 to the second the entrance of the system 16 is measured respectively the path and speed of movement of the carriage 5.

The operation of the device is barely understandable.

The path traversed by the workpiece 1 and the carriage 5 connected by a mechanism

8, during t

F, b „„ 2 b, A,

(one)

where 2 is the number of pulses emitted by sensor 2.

According to the expression (1) the number in the counter 19

BUT

(2)

... "

where 2 / (jg is a constant coefficient, that is, the number A is indeed proportional to the actual coenresses q ,,.

A frequency divider 20 containing an n-bit counter converts the current number Ng of the pulses of the workpiece sensor 2, received at its input T, into the number N, of pulses emitted from its output, in accordance with the expression

N

out

2 in

(3)

The measured movement of the workpiece, expressed in terms of the number of pulses of the sensor 2

 .

(five)

where O phg is the actual average for the time of the measured interlace, the price of the pulse of sensor 2. From expressions (4) and (5) we find

Oipz

   bz n ,,,,

(6)

 5 20

thirty

35

40

45 0

SAPR / GCDI 1.

Considering that the price of the pulse of the sensor 2 during one cycle cannot change significantly, we take

(7)

Taking into account (7) from expression (6) we find

, N ,,,,. (8)

Consequently, the error &, x, introduced by the measuring roller, is compensated: the price-2 sensor-2 impulses are converted into output pulses with the reference price Cj

The value of A, the exact value of which gives the discharge (2), is represented in the counter 19 by an approximate value, namely

e (A) V, 2 ° + V2, 2 + ... + + V (9)

 .,,

where V,, Vj, V4, Vg, .. ,, Vjn- are values that take O or 1 values, respectively, to O or 1 signals at the same inputs of the divider 20. Since A changes smoothly, and (A) is discrete by one when calculating the next pulse, the approximate value may differ from the exact one by no more than one

A - I in (A) A I.

Substituting the values of 6 (A) that are extremely different from A in expression (3) in place A, we find the corresponding numbers of output pulses

Ai i „- -2 K

X

(ten)

where 2 is the circuit factor, and A $.

From expressions (1) and (3) it follows that

Oipi tff- N "x. ()

From expressions (3) and (l6), there is an error in the number of pulses at the output of the computing unit 17

UNBb ,, Ne ,,, - Ne “, - ± -p- Ne ,. ,(eleven)

5. 1284740 As the measurement result of the transfer is obtained by multiplying the number of output pulses by the reference circuit board, the output is pulsed from one second to the other.

Yiu G,,. The error LL corresponds to the measurement error of the displacement

b.

t -. N

ex

f f, uN From (5) and (12) it follows that

tlX

. 4 -2 b

where, taking into account expressions (2), we find

Bx

+ 1.

 BUT

Relative error

(12)

(13) and (7)

(14) (15)

X c. one,

X A

The use of the invention improves the accuracy of cutting of the workpiece and reduces the metal waste due to automatic compensation of the error in moving the workpiece.

Claims (1)

Invention Formula Device for automatic cutting of blanks on a volatile cutting machine with a movable carriage, cutting heads and a mechanism for clamping blanks, containing a pulsed sensor for moving the workpieces; sensor 35 for the carriage motor. five the final position; neither the workpiece clamping mechanism, the carriage motor, the pulse carriage movement sensor coupled to the carriage motor shaft, the carriage motor control system, the computing unit containing a counter, a variable division frequency divider, the division inputs of which are connected to the outputs of the first counter, and the logical element And, characterized in that, in order to improve the accuracy of cutting blanks and reduce waste metal, it is equipped with a second counter pulses and a trigger, one of the inputs of the element I is connected to the output of the pulse sensor moving the carriage, and the other - to the output of the trigger, the output of the element  variable division factor and the second counter, the output of which is connected to the trigger input, the output dat-. The end position of the work clamp mechanism is connected to the inlets 0 reset to the zero state of the first and second counters and the trigger, and the output of the frequency divider with a variable division factor is connected to the input of the electric control system 0