CN105665452A - Method for eliminating head indentation of hot-rolled strip steel - Google Patents

Abstract

The invention discloses a method for eliminating head indentation of hot-rolled strip steel, and belongs to the control technology of a metallurgical hot-rolled strip steel coiling machine. The method is characterized in that head tracking computation is carried out in a primary computer; load correction is carried out for the first time after the head of the strip steel reaches a pinch roll, and load correction is carried out for the second time after the head of the strip steel reaches a wrapper roll; setting according to steel grade and specification is carried out in a secondary computer which is used for sending a hardness group code and a thickness code to the primary computer before the coiling machine establishes tracking; and the primary computer is used for automatically regulating a tripping-off value of the wrapper roll according to different hardness and different thicknesses and carrying out preset control on pressure of the wrapper roll. The method can be used for almost eliminating head indentation defects of the strip steel, so that good benefits are obtained.

Description

A kind of method eliminating hot-strip head impression

Technical field

The invention belongs to metallurgical industry automation field, be specifically related to hot-strip reels control technology.

Background technology

In existing hot-strip reels control system, Wrapping Roll tripping value does not differentiate between steel grade, specification when setting. By to on-the-spot tracking and the analysis to mass data, depth of cup produced by different steel grade, specifications has very big-difference. There is impression defect in hot-continuous-rolling strip steel head, and the degree of depth is relatively deep always, and the degree of depth reaches about 1.2mm, has a strong impact on product quality.

Summary of the invention

The invention aims to improve product quality.

Technical scheme: a kind of method eliminating hot-strip head impression, control pressure when determining that the size of Wrapping Roll automatic jump control AJC (AutomaticJumpControl) tripping value and Wrapping Roll contact with the strip again according to the different hardness group of steel grade.

One metal fever checking device and a cold checking device of metal are set before pinch roll, the cold checking device of metal is positioned at before metal fever checking device, it is also turned on the cold checking device of metal and metal fever checking device, after strip steel head arrives No. 1 Wrapping Roll, the load of Wrapping Roll is connected, strip steel carries out head tracking correction, will be modified to No. 2, No. 3 Wrapping Roll. When strip steel head secondary arrival Wrapping Roll 1 again, No. 2, No. 3 time be no longer modified. Head tracking distance computing formula is as follows:

S=V*t+Sx

S: head tracking distance; V: strip speed; T: run the time; Sx: distance correction value;

Sx is different according to the steel grade of strip steel, thickness, and concrete numerical value is also different.

The present invention can make the degree of depth of strip steel head impression substantially eliminate.

After Taiyuan Iron and Steel Co. hot continuous rolling factory coiling machine system uses the technical program: strip steel head depth of cup is dropped to 0.01 millimeter by 1.2 millimeters; Strip steel head is cut damage amount and is substantially reduced.

Detailed description of the invention

One metal fever checking device and a cold checking device of metal are set before pinch roll, the cold checking device of metal is positioned at before metal fever checking device, it is also turned on the cold checking device of metal and metal fever checking device, start the tracing control of strip steel, speed according to strip steel, calculate strip steel head and arrive the time of pinch roll and Wrapping Roll, thus setting up head tracking. After strip steel head arrives No. 1 Wrapping Roll, the load of Wrapping Roll is connected, and strip steel carries out head tracking correction, will be modified to No. 2, No. 3 Wrapping Roll.When strip steel head secondary arrival Wrapping Roll 1 again, No. 2, No. 3 time be no longer modified. Head tracking distance computing formula is as follows:

S=V*t+Sx; Unit is mm;

S: head tracking distance; V: strip speed; T: run the time; Sx: distance correction value;

Thickness is the Q235B steel of 15 ~ 16mm, Sx=30mm;

Thickness is the Q235B steel of 16 ~ 19mm, Sx=37mm;

Thickness is the Q235B steel of 19 ~ 22mm, Sx=40mm;

Thickness is the Q245R steel of 15 ~ 16mm, Sx=35mm;

Thickness is the Q245R steel of 16 ~ 19mm, Sx=41mm;

Thickness is the Q245R steel of 19 ~ 22mm, Sx=43mm.

Illustrating: the numbering of Wrapping Roll is the Wrapping Roll that strip steel first contacts in a clockwise direction is No. 1 Wrapping Roll, the second Wrapping Roll contacted is No. 2 Wrapping Roll, the 3rd Wrapping Roll contacted is No. 3 Wrapping Roll;

Hardness group according to different steel grades determines the pressure of Wrapping Roll tripping value and Wrapping Roll.

Different steel grades are different due to hardness, and Wrapping Roll contacts with the strip after pressurized, and the degree of depth producing impression is different. Adopt optimum value by distinguishing steel grade hardness, the tripping value of Wrapping Roll and Wrapping Roll pressure, eliminate the generation of head impression to greatest extent.

In second computer, the chemical composition according to slab determines different steel grades, determines different hardness groups according to different steel grades, and before coiling machine is set up and followed the tracks of, hardness group code and thickness code are issued primary computer by second computer. Primary computer is automatically adjusted the tripping value of Wrapping Roll and the force value of Wrapping Roll according to different hardness and thickness specification.

Claims (2)

1. the method eliminating hot-strip head impression, is characterized in that carrying out head tracking calculating in primary computer, and strip steel head carries out first time load correction after arriving pinch roll, carries out second time load correction after arriving Wrapping Roll; Carrying out point steel grade specification in second computer to set, before coiling machine is set up and followed the tracks of, hardness group code and thickness code are issued primary computer by second computer; Primary computer is automatically adjusted the tripping value of Wrapping Roll according to different hardness and thickness and carries out the given control of Wrapping Roll pressure.

2. a kind of method eliminating hot-strip head impression according to claim 1, it is characterized in that described loading correcting method is to arrange a metal fever checking device and a cold checking device of metal before pinch roll, the cold checking device of metal is positioned at before metal fever checking device, it is also turned on the cold checking device of metal and metal fever checking device, after strip steel head arrives No. 1 Wrapping Roll, the load of Wrapping Roll is connected, strip steel carries out head tracking correction, will carry out head tracking correction to No. 2, No. 3 Wrapping Roll; When strip steel head secondary arrival Wrapping Roll 1 again, No. 2, No. 3 time be not modified;

Head tracking modified computing formulae is as follows:

S=V*t+Sx

S: head tracking distance; V: strip speed; T: run the time; Sx: distance correction value;

Sx is 30,35,37,40,41 or 43.