SU1449255A1 - Method of controlling the pattern-cutting of hot rolled stock - Google Patents

Abstract

The invention relates to the field of metal processing, in particular, to the management of rolling cutting. The purpose of the invention is to improve the accuracy of cutting of rolled steel, mainly rails, by introducing a correction in the length of movement of subsequent cutting heads by the amount of movement error in the arrangement of the previous ones. The temperature of the roll is measured. The magnitudes of displacement of the cutting heads are determined from the change in temperature of the roll. The amount of movement of the cutting heads and their stop of movement for the calculated distance are controlled in order to simultaneously cut the roll. Introducing a cutting head with the smallest calculated movement value, the day of this error with the calculated movement value of the next cutting head and repeating these operations for each subsequent cutting head after stopping the previous one, improves cutting accuracy. I il. i (L

Description

The invention relates to the field of metal processing, in particular, to the management of rolling cutting.

The purpose of the invention is to improve the cutting accuracy of rolling, mainly rails.

The method is implemented under the conditions of the established process of cutting rolled.

When entering the zone of the expansion rail roll, its temperature T is measured ;, the difference is calculated. the temperature of the current T and the previous T rolls and, based on the temperature difference obtained, determine the change in the length of the rail L in the hot state

41 L ,, “(T, - - t;.,),

where is L; , is the length of the rail at a temperature T, -. ,, MMi

d is the linear expansion coefficient, 1 / C.

When the row of cutting heads is sequentially arranged, in order to obtain the same dimensional lengths of rails, the cutting heads must be moved to distances, the value of which depends on the sequence number of the cutting head.

L1P p-31,

where n is the serial number of the cutting head (with the irreversible stoppage of the ra-

After determining the length of the movement for each cutting head L1 ,, (51, dl, etc., the mechanisms of movement of the cutting heads are switched on and the actual length of their movement is measured. Since the cutting heads must move over distances proportional to their order If the cutting heads are simultaneously switched on, the specified distance between the cutting heads will pass with the shortest order number. After the moving mechanism stops, the actual moving length of the first cutting head L is measured comparing it with the calculated value of h, h, and determines the concavity of

c, lp - D1,.

Total errors rf displacement cutting: heads with increasing

five

0

five

0

Q

0

five

order numbers may exceed allowable limits, resulting in defective products.

Therefore, the length of movement of each subsequent cutting head must be corrected, the value of which is equal to the error of movement of the previous cutting head.

The corrected travel length of the second cutting head is

P1 Corr P1,.

The drawing shows a diagram of a device that implements a method for controlling the cutting of hot rolled products.

A device that implements the proposed method works as follows.

Using a rail length adjuster 1, a predetermined rail length value is set at a certain temperature T., and cutting heads are arranged along these lengths. When the next roll enters the cutting zone, the temperature is measured by temperature gauge 2 T. In multiplier 3, the change in rail length L1 is calculated from the temperature change 4 T (JT T - T,). The calculated value of the length of rail L1 enters the switch A for the registers 5.1-5.3 of the blocks 6.1-6.3 for controlling the movement of the cutting heads, and each register is multiplied by a constant coefficient, the value of which corresponds to the number of the cutting head. After turning on mechanisms 7.1-7.3 of moving cutting heads from gauges 8.1-8.3 of moving length, kinematically connected with mechanisms 7.1.-7.3 of moving cutting heads, information about actual length 41 goes to the first inputs of the comparison elements 9.1-9.3. The second inputs of the comparison elements 9.1-9.3 receive information from the registers 5.1-5.3. When the measured length 41, the cutting head movement mechanism 7.1 becomes equal to the value entered in the register 5.1, a signal is output from the comparison element 9.1 to turn off the first cutting head movement mechanism 7.1.

After stopping the mechanism 7.1 of moving the cutting head in the element

9.1 comparison, the determination of the movement error f is made. The magnitude of the error is entered in the correction block 10.1, which is used to correct the calculated value of the displacement length of the second cutting head & 1, In the register 5.2, the corrected value of the displacement length is entered

1 ksrr 1

, cf.

In element 9.2, the comparison of the second cutting head displacement control unit 6.2 compares the measured displacement length 41 with the corrected value Lp and, if they are equal, turns off the displacement mechanism 7.2 of the cutting head.

After the mechanism 7.2 for moving the second cutting head stops, the value of the error cG for moving through the correction block 10.2 is entered into register 5.3 of the third control block 6.3 for moving the cutting heads. The third cutting head moves similarly to the second one.

The application of the proposed method makes it possible to adjust the length of movement of successively located cutting heads depending on the error in moving the truncation rx. cutting heads, resulting in increased cutting accuracy.

Claims (1)

Invention Formula Q. The control method of cutting the hot rolled product, which consists in measuring the temperature of the roll, determines the values of the distance of movement of the successively set 5 cutting heads by changing the temperature of the roll, control the values of the distance of movement of the cutting heads and stop them after moving to the calculated distance for the simultaneous cutting A roll, characterized in that, in order to improve the accuracy of cutting hot rolled steel, mainly rails, the installation error of the cutting head having the smallest calculated displacement amount is determined, and this error is summed up with the calculated displacement value of the subsequent movement.