Hot continuous rolling stainless steel strip steel tail portion loop control method

Abstract

The invention belongs to the field of hot rolling strip steel, and particularly relates to a hot continuous rolling stainless steel strip steel tail portion loop control method. Step 1, a broken line is designed, a rectangular plane coordinate system is built, a force moment deviation value of a trip steel tail portion loop, namely, the difference between the given moment and the actual moment, serves as the X axis of the rectangular plane coordinate system, and a loop moment control coefficient value serves as the Y axis of the rectangular plane coordinate system, and the broken line is a three-section linear equation; step2, the algorithm of a strip steel tail portion loop moment controller is that Yn=Yn-1 +Kpn*{[1+TA / TN]*deltaYEn-deltaYEn-1}; step 3, if being within the range between delta1 and delta2, the moment deviation value of the trip steel tail portion loop is calculated according to the step 1, and if being beyond the range between the delta1 and the delta2, the moment deviation value of the trip steel tail portion loop is calculated according to the broken line, maximum amplitude limiting and minimum amplitude limiting are also adopted, the maximum amplitude limiting value is 8*10<-6>, and the minimum amplitude limiting value is 1*10<-6>; step 4, the loop is controlled by a hydraulic loop servo valve according to the result, calculated through the step 3, of the loop moment control coefficient.

Description

technical field [0001] The invention belongs to the field of hot-rolled steel strips, in particular to a method for controlling the tail loop of hot-rolled stainless steel strips. Background technique [0002] With the increase of stainless steel development and slab weight, the actual temperature of the tail of the stainless steel strip is slightly lower than that of the head of the strip during finishing rolling, resulting in that the actual torque of the loop is greater than the given torque of the loop when the tail of the strip is turned into a small loop , causing the tail of the strip to drop early when the steel is dropped, resulting in quality problems such as roll marks on the surface of the stainless steel strip, which will lead to direct scrapping between the racks and bring great economic losses to our factory. Contents of the invention [0003] The technical problem to be solved by the present invention is: how to ensure the control of the tail of the finish ...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: how to ensure the control of the tail of the finish rolling loop when rolling stainless steel, solve the unstable phenomenon of loop tail flicking between the finish rolling stands, and ensure the normal production and product quality of hot rolling

Images