CN102632084A - Method for controlling head tower of stainless steel hot-rolled coil - Google Patents

Abstract

The invention provides a method for controlling head tower of a stainless steel hot-rolled coil, in order to reduce the head tower of Cr stainless steel coils. The method comprises the following steps of: locating a rolling side guide plate in a waiting position before a steel strip enters into the rolling side guide plate from a finishing mill, wherein the opening degree of the waiting position is equal to actual measured width of a finish rolling outlet plus 60mm allowance, and 30mm is leaved on each side; delaying for 0.5 seconds after clamping the steel by a coiling pinch roller; quickly closing for 18mm on each of the working side and the transmitting side of the rolling side guide plate within 0.8 seconds; still leaving a 12mm distance from each side to the steel strip; keeping the transmitting side of the rolling side guide plate still and applying pressure control to the working side of the rolling side guide plate; quickly closing the side guide plate when the steel clamped by the coiling pinch roller of the head is in contact with the steel strip for +0.5 seconds; and slowly closing the side guide plate after the steel clamped by the coiling pinch roller is in contact with the steel strip for 1.3 seconds till reaching a preset pressure of the side guide plate.

Description

A kind of stainless steel hot-rolling volume head turriform control method

Technical field

The present invention relates to hot rolled coil head turriform control method on a kind of stainless steel hot-rolling production line.

Background technology

On the stainless steel hot-rolling production line, general, Cr is that stainless steel 2Cr13 1Cr13,1Cr17,430 etc. all need advance cover annealing; Require the head turriform less than 30mm, but on some production line, Cr is that the ultra 30mm ratio of stainless steel turriform is for a long time about 40%--50%; Main cause is that band steel toe portion and band body use same setting pressure, and it is slow that head side is led closing velocity, begins to throw pressure and controls to and find setting pressure to need about 15 seconds; Pressing strip speed 10m/S calculates; Just reach steady pressure after the band steel moves 150 meters, the active side flipper guide in time will not be with steel to grasp like this, and turriform appears in the coil of strip outward appearance; Turriform exceeds standard to roll up also needed smooth unit, can cause cost to increase like this, and have influence on cashing of indentured period.

Summary of the invention

The present invention seeks to overcome the deficiency of above-mentioned prior art, it is the stainless steel hot-rolling volume head turriform control method that operation was annealed under stainless-steel roll head turriform, realization did not directly get into through planisher group rewinding that a kind of Cr of reducing is provided.

The inventive method is:

(1) the band steel shuts out to get into from finishing mill and batches the side leading, batches flipper guide and is in the wait position, and width+60MM surplus, each 30mm of every side are surveyed in a wait position aperture=finish rolling outlet;

(2) after coiling clamp roller is stung steel, add time-delay in 0.5 second, batch that side is led active side and transmission side two side positions every side in 0.8 second is closed 18mm rapidly, every side side diversion band steel still has 12mm; This is that side is led action for the first time;

(3) the transmission side side is led and is kept motionless; The active side side is led and is dropped into pressure control, and active side side guidance tape steel direction is closed clamping band steel, and closing velocity is directly proportional with setting pressure; The last active side side of band 10 meters distances of steel toe portion is led and is taked big pressure control, leads responsiveness to improve side;

(4) band steel toe portion gets into pinch roll, and band steel toe portion pinch roll is stung steel and touched band steel+0.5 a second side and lead quick closedown, pinch roll sting steel touch the band steel after 1.3 seconds flipper guide begin slowly to close, reach setting pressure up to flipper guide.

According to above-mentioned steps, can on the stainless steel hot-rolling coiling machine, develop automatic control program; After head got into pinch roll, flipper guide head pressure control mode started, and 10 meters sides of head are led and used big pressure function, that is: 2.5mm controls according to multiple coefficient 2.0 setting pressures with 10 meters big pressure of downside top guide portion; 2.5mm---3.7mm 10 meters big pressure of side top guide portion are according to multiple coefficient 1.7 setting pressures; 3.7, both solved head side and led the slow problem of responsiveness according to multiple coefficient 1.5 setting pressures with 10 meters of head portion, still little pressure clamping strip edge portion after looking after 10 meters again guarantees that side leads the strip edge portion of hindering of not squeezing.

The invention solves Cr is stainless steel turriform hypergeometric example problem on the stainless steel hot-rolling production line, can effectively reduce Cr stainless-steel roll head turriform, realizes directly not getting into operation cover annealing down through planisher group rewinding, saves time, and saves cost.

The specific embodiment

When hot continuous rolling factory of Shanxi Taigang Stainless Steel Co., Ltd 2250 production lines were produced the motor-car compartment with stainless steel T4003, because after this steel must hot rolling reeling accomplishes, annealing was earlier carried out smoothly again, and turriform is required strictness especially.Adopt general method; Because the head turriform causes convection current plate backfin in the annealing; Moved back one 27 tons heavy coil of strips of fire and need useless 2-2.5 ton have partly been cut in a tower backfin, pressed the about 5.4 ten thousand tons of calculating of this kind of Taiyuan Iron and Steel Co. whole year production steel, roughly cut useless 4000-5000 ton at planisher.After adopting the inventive method, this steel grade head turriform has satisfied time operation demand fully.

With Cr is that stainless steel 4.0*1535 T4003 (this kind is mainly used in the motor-car railway carriage or compartment, and the good corrosion ability is arranged, and intensity is higher) is an example:

The band steel shuts out to get into from finishing mill and batches the side leading, batches flipper guide and is in the wait position, and width+60MM surplus, each 30mm of every side are surveyed in a wait position aperture=finish rolling outlet; This specification band steel nominal width 1535, hot target width 1550 down, side is led and is waited for that the position is set at 1550+60=1610mm.

Pinch roll is stung behind the steel in about 0.8 second, side is led once being closed to 1574mm.

The transmission side side is led motionless, and active side was used big pressure secondary to close side and led, and reached setting pressure 8.5KN at 0.5 second.And the method before adopting, side is led secondary and is closed to and finds setting pressure to need about 3 seconds, and flipper guide begins to find the setting pressure time to shorten 2.5 seconds to grasping the band steel from secondary action.This type of band steel calculates by coiling speed 6M/S, and the band steel had moved 15 meters in 2.5 seconds, pressed 2.5 meters calculations of the average every circle of coil of strip head, and the turriform number of turns has reduced about the 15/2.5=6 circle, and turriform is effectively controlled.

For not causing the production line steel scrap, can during parking maintenance program be incorporated into the power networks to carrying out programming and testing earlier according to the automatic control program inside of the inventive method exploitation; For guaranteeing program reliability, after program is incorporated into the power networks, carry out analog rolling repeatedly; So-called analog signal is the same with the tracking of real band steel fully, and program inner setting, control sequential are simulated true band steel fully, through repeatedly check; And after carrying out thermal load test, line traffic control can put into production.

Claims (1)

1. a stainless steel hot-rolling is rolled up head turriform control method, it is characterized in that:

(1) the band steel shuts out to get into from finishing mill and batches the side leading, batches flipper guide and is in the wait position, and width+60MM surplus, each 30mm of every side are surveyed in a wait position aperture=finish rolling outlet;

(2) after coiling clamp roller is stung steel, add time-delay in 0.5 second, batch that side is led active side and transmission side two side positions every side in 0.8 second is closed 18mm rapidly, every side side diversion band steel still has 12mm;

(3) the transmission side side is led and is kept motionless; The active side side is led and is dropped into pressure control, and active side side guidance tape steel direction is closed clamping band steel, and closing velocity is directly proportional with setting pressure; The last active side side of band 10 meters distances of steel toe portion is led and is taked big pressure control, leads responsiveness to improve side;

(4) band steel toe portion gets into pinch roll, and band steel toe portion pinch roll is stung steel and touched band steel+0.5 a second side and lead quick closedown, pinch roll sting steel touch the band steel after 1.3 seconds flipper guide begin slowly to close, reach setting pressure up to flipper guide.