SU1667971A1 - Method for checking up pilger roll for wear - Google Patents

Abstract

The invention relates to the processing of metals by pressure, in particular to the production of hot rolled pipes in pilger mills. The goal is to improve the accuracy of determining the wear of pilgervalka. The method of automatic wear control of a pilgerwalk is that periodically, after a predetermined number of rolling cycles, the angle of rotation of the roll is measured during the time from the start of the rise of the rolling force until it drops to zero. The angle measured at the start of operation of the newly calibrated roll is remembered. Roller wear is estimated as the difference between the value of the rotation angle stored in the memory and the value measured at the time of determining the amount of wear. The application of the proposed method will improve the accuracy of determining the amount of wear pilgervalka. 2 Il.

Description

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The invention relates to the processing of metals by pressure, in particular to the production of hot rolled pipes in pilger mills.

The purpose of the invention is to improve the accuracy of determining the pilgerwalk wear.

Wear on the profile of the ridge of the roll is characterized by a large unevenness. The greatest wear rate occurs in the region of the point of the first contact between the roll ridge and the liner (the gripping point). As wear in this place distorts the profile of the ridge of the roll, so that the point of first contact will move away from the beginning of the striker, which means that the central angle corresponding to the roll section from the pick point to the end of the working piece will decrease.

This central angle is equal to the angle of rotation of the roll for the time from the moment of the occurrence of the rolling force to the moment of its fall

down to zero and can serve as a measure of the degree of wear pilgerwalka.

The method of determining the wear of the pilgerwalk is that periodically, after a predetermined number of rolling cycles, the angle of rotation of the roll is measured over the period from the moment the rolling force occurs until it decreases to zero, the angle of rotation is measured at the start of operation of the new calibrated roller, and wear is determined by the difference in the values of the angle of rotation of the roll for the period from the moment of occurrence of the rolling force until it decreases to. zero at the start of operation of the new calibrated roll.

FIG. 1 shows a device that implements the proposed method; in fig. 2 is the electrical circuit diagram of the control unit.

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The device contains (Fig. 1) rotation angle sensor 1, rolling force sensor 2, Schmitt trigger 3, multiphase clock generator 4, AND element 5, control unit 6, button 7 with normally closed contact, summing -counter 8, subtracting counter 9, block 10 display. In this case, the rotation angle sensor 1 is connected to one of the inputs of the element 5, and the rolling force sensor 2 to the input of the Schmitt trigger

3, the output of which is connected to the input of the multi-phase clock generator 4. The first, second and fourth phases of the output of the multiphase clock generator 4 are connected to the control inputs of the control unit 6, the third phase to the second input of the And 5, Second phase generator 4, except addition, connected to the input of the resolution of the parallel recording of the subtractive counter 9. One pole of the button 7 is connected to the common wire of the device, and the other pole to the installation inputs of the control unit 6 and the summing counter 8. The output of the control unit 6 is electrically connected to the input house account authorization counter 8. The output of AND 5 is connected to the counting inputs of the counters 8 and 9. The counter 9 bychitayuschy parallel inputs connected to the outputs of recording totaliser 8, and outputs - to the display unit 10.

The control unit 6 (FIG. 2) contains two D-flip-flops 11 and 12, an OR 13 element and two resistors 14 and 15. At the same time, the counting inputs of the flip-flops 11 and 12 are connected to the first and second phases of the generator, respectively

4. The D input of the trigger 11 through a resistor 15 is connected to the power supply plus, and the D input of the trigger 12 to the direct output of the trigger 11. The installation inputs of the trigger 11 and 12 are connected to the output of the OR element 13, one of the inputs of which is connected to the fourth generator phase 4, and the second input - with button 7 and through resistors 14 with a positive power source. The direct output of D-flip-flop 12 is connected to the enable input of the counter 8.

The device works as follows.

At the very beginning of the operation of the calibrated pilger-roll installed in the cage, the value of the central angle corresponding to the roll section from the pick point to the end of the working part (release point) is entered into the wear control device, and the wear value is estimated from its change. To do this, the operator during the established rolling process briefly presses the button 7. In this case, the following occurs. The installation inputs of the counter 8 and the trigger 11 and 12 will go logical

1, which transmits them to the zero state. A logical O at the output of the trigger 12 will prohibit the operation of the counter 8 and keep it in the zero state. It will be

continue until one of the pulses generated by the Schmitt trigger 4 from the analog signal rolling force coming from sensor 2 to the sensor 2 does not work in the first phase of generator 4. Multiphase

0 clock generator 4 operates in such a way that each pulse arriving at its input appears at one of the outputs, and the pulses at the outputs (phases) of generator 4 appear alternately and the durations of the input and corresponding output pulses are equal. When a pulse is generated at the output of the first phase of the generator 4, which is formed by a Schmitt trigger 3 from the analog signal of sensor 2

0 effort, the logical trigger 11 will be recorded. At the output of the trigger 11, the logic level 1 will be set. The next pulse of the multi-phase clock generator 4 is output at the second phase output, the post5 is fed to the C input of the trigger 12 and sets the last one to one. In addition, a pulse in the second phase will write zeros from counter 8 to counter 9, Logical 1 at the output of trigger 12 will give a solution for the operation of counter 8 and, as soon as the output of the third phase of the generator 4 has a logical level 1, to the summing input the counter 8 through the element And 5 will start to receive pulses from the sensor 1 of the angle

5 turns. The arrival of pulses to the counter 8 will stop only when the output level of the third phase of the generator 4 is set to logic level O, i.e. The number of pulses entered into counter 8 will be proportional to the pulse duration at the output of the third phase of the generator 4. Since this duration is equal to the duration of the effect of the roll on the workpiece metal in one roll cycle. that recorded in

5 counter 8 number will be proportional to the central angle corresponding to the roll section from the pick point to the release point. At the next moment, when the pulse of the generator 4 turns on its fourth phase, the triggers 11 and 12 are set to the zero state and the control unit 6 will not perceive any external signals (except for pressing the button 7). Logic O at the input of the resolution of the counter 8

5 will hold the last one in the storage mode of the recorded number throughout the device operation (the new number can be overwritten only by briefly pressing the button 7). At this stage, the preparation of the device for operation ends. The code in counter 9, which appeared for a short time at the stage of preparing the device for operation, is intermediate and is not taken into account. In the future, the device will operate cyclically as follows. When a pulse appears in the second phase of the generator 4, the number from counter 8 is parallel to the counter 9, and when the pulse appears in the third phase, pulses from the angle sensor 1 are transmitted through AND 5 to the subtractor during the entire duration the input of the counter 9. As a result, in the counter 9 after the pulse disappears from the third phase of the generator 4, a number equal to the difference between the number stored in the counter 8 and the number of pulses received at the counting input of the counter 9 will be written. The meter in the counter 9, characterizes the decrease in the central angle corresponding to the pilger-roller section from the pick-up point to the discharge point, caused by the roll wear, and is an indicator of the degree of wear. Through the number of rolling cycles, equal to the number of phases in the generator 4, the measurement cycle of the device is periodically repeated. The amount of wear (reduction of the central angle) obtained in subtractive counter 9 is displayed using the display unit 10.

The duration of the rolling cycle (one turn pilgerwalka) on pilger 5 ... 12 is approximately 1 s. The duration of the measurement process in the device takes two rolling cycles (about 2 s). For the convenience of the operator working with the device, the duration of the indication should be 4-5 times longer than the duration of the measurement, i.e. take 8-10 rolling cycles. Therefore, the conversion factor generator 4 (the number of phases) must be equal to 10-12.

The use of the pilgerwalk wear control method makes it possible to significantly improve the accuracy of on-line determination of the roll wear degree and, by timely replacement, eliminate the release of defects caused by the distortion of the pilgerwalk geometry.

Claims (1)

Invention Formula A pilgerwalk wear control method including a rolling force measurement characterized in that. that, in order to improve the accuracy of determining wear, periodically, after a predetermined number of rolling cycles, the angle of rotation of the roll is measured at the start of operation of the newly calibrated roll, the angle of rotation of the roll is measured over the period from the moment the rolling force occurs to its reduction to zero and the value wear is determined by the difference of the measured values. FIG. 2