CN101934289B - Adjusting method of stainless-steel cold continuous-rolling roll gap - Google Patents

Abstract

The invention discloses an adjusting method of a stainless-steel cold continuous-rolling roll gap. By adopting a roll gap calculation mathematical model in a process control level, the roll gap value of the next steel strip in a steady state, a roll gap adjustment amount when a low speed at which the current steel strip is rolled changes to the transient state of the current/ next steel strip, a roll gap adjustment amount when the transient state of the current/ next steel strip is changed to the lower speed at the next steel trip is rolled are calculated, and sent to a basic automatic level, the stainless-steel cold continuous-rolling roll gap is adjusted and controlled by the basic automatic level according to the roll gap value and the roll gap adjustment amounts. The invention can improve the setting accuracy of the roll gap in an unstable state, effectively reduce the thickness length tolerance of the steel strip in the unstable state and improve the yield of the head and the tail of the steel strip.

Description

Stainless steel cold continuous-rolling roll gap method of adjustment

Technical field

The present invention relates to metallurgical automation technology, particularly a kind of stainless steel cold continuous-rolling roll gap method of adjustment.

Background technology

The computer control system of stainless steel tandem mills mainly forms by three grades: production control level L3, process control level L2, Basic automation level L1.Wherein process control level L2 is the core of whole system, and its task is to be rolled setting parameter to calculate, so that milling train is produced the cold-rolling stainless steel product met the demands as far as possible.In process of production, L2 receives the next initial data of wanting rolled band steel from L3, L2 according to the process conditions of the finish to gauge thickness of product, the performance limitations of milling train, the characteristic with steel to be rolled, the operation of rolling etc., adopts Mathematical Modeling to carry out precomputation to the target data with steel and milling train.This computational process has been utilized the Mathematical Modeling of the operation of rolling, and Mathematical Modeling is the target data with steel and milling train to be carried out to the core of precomputation thus.

In the production process of stainless steel cold continuous rolling, as shown in Figure 1, current band steel starts to make to be with steel head to enter roll with low speed and is rolled, then progressively enter at a high speed and be rolled, enter after the high speed certain time as the stable state of rolling, reduce when current belt steel rolling will finish that the speed by roll is rolled to low speed with steel.If front and back band steel specification difference, by dynamic variable specification FGC (Flying Gauge Control), control and currently with steel, with next, with the weld seam between steel, enter roll with transient state speed and be rolled with the transient state draught pressure, then progressively enter at a high speed and with high-speed rolling pressure, lower band steel be rolled, complete successively weld together respectively with the rolling of steel.

For plate shape and the thickness of slab precision of improving the finish to gauge product, the setting accuracy that improves roll gap is an important and feasible approach.But the roll gap that traditional roll gap calculates just the high speed stable state carries out adaptive setting calculating, and the setting accuracy of its roll gap is not high, this makes crosses frame when weld seam and enters roll and be rolled, and when unsteady state, the overproof length of thickness is larger, and band steel lumber recovery is low.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of stainless steel cold continuous-rolling roll gap method of adjustment, adopt the method accurately to set gap values between rollers, make and cross frame when weld seam and enter roll and be rolled, when unsteady state, the overproof length of thickness is little, and band steel lumber recovery is high.

For solving the problems of the technologies described above, stainless steel cold continuous-rolling roll gap method of adjustment of the present invention, process control level receives roll from the production control level and reaches the initial data of wanting rolled band steel, process control level is according to described initial data, adopt roll gap computational mathematics model, calculate rolling next with steel the gap values between rollers in stable state, current with steel the gap values between rollers when the low speed, current/next gap values between rollers with steel transient state, next is the gap values between rollers when the low speed with steel, and calculate from rolling is current and change to current/next adjustment amount of the roll gap with steel transient state with steel low speed, from current/next with the steel temporal variations to next adjustment amount of the roll gap with steel low speed of rolling, process control level will calculate next with steel the gap values between rollers in stable state, change to current/next adjustment amount of the roll gap with steel transient state with steel low speed from rolling is current, from current/next sends to Basic automation level with the steel temporal variations to next adjustment amount of the roll gap with steel low speed of rolling, Basic automation level is adjusted control according to described gap values between rollers and roll gap adjustment amount to the stainless steel cold continuous-rolling roll gap.

Described roll gap computational mathematics model is:

$S=h-\frac{P}{k}+{\mathrm{SZ}}_0+S_0+\mathrm{ds}0$

${\mathrm{ds}0}_i=\frac{{\mathrm{ds}0}_i^{\mathrm{FDT}}+{\mathrm{ds}0a}_i}{2}$

ds0a _i＝sa _i-sca _i

Wherein, S is the roll gap calculated value; H is belt steel thickness; K is the milling train modulus, is the power on unit length; The P draught pressure; SZ ₀roll-gap position for actual measurement after the end of school roller; S ₀for the roll gap zero value; Ds0 is adaptation coefficient; Sa _ifor current roll gap actual measured value; sca _ifor the current gap values between rollers calculated according to the roll gap computation model, in this calculating, the roll gap adaptation coefficient is got last band steel adaptation coefficient; Ds0a _ifor the roll gap deviate; Ds0 _i ^fDTfor roll gap deviation value of feedback, the i.e. mean value of historical adaptation coefficient; Ds0 _ifor current band steel adaptation coefficient;

Process control level is according to the belt steel thickness, width, the yield strength equal-specification data that receive from the production control level, and the school roller uploaded of Basic automation level finish after Roll-gap position, roll gap zero value, the current roll gap actual measured value of actual measurement, calculate current with steel transient state, current roll gap adaptation coefficient ds0 of having slowed down while entering three states of low speed when stable state, FGC finish _iand storage, and calculate its mean value according to the historical adaptation coefficient of storage, as roll gap deviation value of feedback ds0 _i ^fDT;

Change to current/next adjustment amount of the roll gap with steel transient state ds=S with steel low speed from rolling is current _{next band steel transient state}-S _{current band steel low speed}, from current/next with the steel temporal variations to next adjustment amount of the roll gap with steel low speed ds=S of rolling _{next band steel low speed}-S _{next band steel transient state}, S wherein _{next band steel transient state}represent current/next gap values between rollers with steel transient state, S _{current band steel low speed}represent the current gap values between rollers during with steel low speed of rolling, S _{next band steel low speed}represent next gap values between rollers during with steel low speed of rolling.

Adaptation coefficient ds0 initial value is set as 0.

Stainless steel cold continuous-rolling roll gap method of adjustment of the present invention, process control level adopts roll gap computational mathematics model, calculate next with steel the gap values between rollers of stable state, from rolling current with steel low speed, change to current/next adjustment amount of the roll gap with steel transient state, from current/next, and falls described roll gap adaptation coefficient and sends to Basic automation level to roll gap adaptation coefficients such as next adjustment amounts of the roll gap with steel low speed of rolling with the steel temporal variations.Cross at high speed stable state, weld seam that frame dynamic variable specification FGC completes respectively, reduction of speed completes and enters these three moment point of low speed and collect current actual values with steel and calculate the roll gap adaptation coefficient in these three moment, for next, with steel, the fixed value of roller slit in these three moment point calculates, Basic automation level is adjusted control according to described roll gap adaptation coefficient to the stainless steel cold continuous-rolling roll gap, can improve the setting accuracy of gap values between rollers under unsteady state, effectively minimizing in the overproof length of the thickness under unsteady state, improves the lumber recovery with steel head and afterbody with steel.

The accompanying drawing explanation

Below in conjunction with the drawings and the specific embodiments, the present invention is described in further detail.

Fig. 1 is that gap values between rollers calculates schematic diagram constantly.

The specific embodiment

Stainless steel cold continuous-rolling roll gap method of adjustment of the present invention, process control level L2 receives roll from production control level L3 and reaches the initial data of wanting rolled band steel, process control level is according to described initial data, adopt roll gap computational mathematics model, calculate next with steel the gap values between rollers in stable state, current with steel the gap values between rollers when the low speed, current/next gap values between rollers with steel transient state, next is the gap values between rollers when the low speed with steel, and calculate from rolling is current and change to current/next adjustment amount of the roll gap with steel transient state with steel low speed, from current/next with the steel temporal variations to next adjustment amount of the roll gap with steel low speed of rolling, process control level will calculate next with steel the gap values between rollers in stable state, change to current/next adjustment amount of the roll gap with steel transient state with steel low speed from rolling is current, from current/next sends to Basic automation level L1 with the steel temporal variations to next adjustment amount of the roll gap with steel low speed of rolling, Basic automation level is adjusted control according to described gap values between rollers and roll gap adjustment amount to the stainless steel cold continuous-rolling roll gap.

As a preferred embodiment, roll gap computational mathematics model is:

$S=h-\frac{P}{k}+{\mathrm{SZ}}_0+S_0+\mathrm{ds}0$

${\mathrm{ds}0}_i=\frac{{\mathrm{ds}0}_i^{\mathrm{FDT}}+{\mathrm{ds}0a}_i}{2}$

ds0a _i＝sa _i-sca _i

Wherein, S is the roll gap calculated value; H is belt steel thickness; K is the milling train modulus, is the power on unit length; The P draught pressure; SZ ₀roll-gap position for actual measurement after the end of school roller; S ₀for the roll gap zero value; Ds0 is adaptation coefficient; Sa _ifor current roll gap actual measured value; sca _ifor the current gap values between rollers calculated according to the roll gap computation model, in this calculating, the roll gap adaptation coefficient is got last band steel adaptation coefficient; Ds0a _ifor the roll gap deviate; Ds0 _i ^fDTfor roll gap deviation value of feedback, the i.e. mean value of historical adaptation coefficient; Ds0 _ifor current band steel adaptation coefficient;

Process control level is according to the belt steel thickness, width, the yield strength equal-specification data that receive from the production control level, and the school roller uploaded of Basic automation level finish after Roll-gap position, roll gap zero value, the current roll gap actual measured value of actual measurement, calculate current with steel transient state, current roll gap adaptation coefficient ds0 of having slowed down while entering three states of low speed when stable state, FGC finish _iand storage, and calculate its mean value according to the historical adaptation coefficient of storage, as roll gap deviation value of feedback ds0 _i ^fDT;

Change to current/next adjustment amount of the roll gap with steel transient state ds=S with steel low speed from rolling is current _{next band steel transient state}-S _{current band steel low speed}, from current/next with the steel temporal variations to next adjustment amount of the roll gap with steel low speed ds=S of rolling _{next band steel low speed}-S _{next band steel transient state}, S wherein _{next band steel transient state}represent current/next gap values between rollers with steel transient state, S _{current band steel low speed}represent the current gap values between rollers during with steel low speed of rolling, S _{next band steel low speed}represent next gap values between rollers during with steel low speed of rolling.

Adaptation coefficient ds0 initial value is set as 0.

In stainless steel cold continuous rolling process controlled stage L2, current with steel when stable state, FGC finish transient state, slowed down enter three state computation of low speed moment point as shown in Figure 1.To obtain respectively with steel the data during in the high speed stable state for calculating with steel the gap values between rollers in stable state, by obtain the data with steel transient state when FGC finishes for calculating the gap values between rollers with steel transient state, completing the gap values between rollers of data while entering low speed for calculating gap values between rollers during with steel low speed with steel in reduction of speed by what obtain.

Stainless steel cold continuous-rolling roll gap method of adjustment of the present invention, process control level adopts roll gap computational mathematics model, calculate next with steel the gap values between rollers of stable state, from rolling current with steel low speed, change to current/next adjustment amount of the roll gap with steel transient state, from current/next, and falls described roll gap adaptation coefficient and sends to Basic automation level to roll gap adaptation coefficients such as next adjustment amounts of the roll gap with steel low speed of rolling with the steel temporal variations.Cross at high speed stable state, weld seam that frame dynamic variable specification FGC completes respectively, reduction of speed completes and enters these three moment point of low speed and collect current actual values with steel and calculate the roll gap adaptation coefficient in these three moment, for next, with steel, the fixed value of roller slit in these three moment point calculates, Basic automation level is adjusted control according to described roll gap adaptation coefficient to the stainless steel cold continuous-rolling roll gap, can improve the setting accuracy of gap values between rollers under unsteady state, effectively minimizing in the overproof length of the thickness under unsteady state, improves the lumber recovery with steel head and afterbody with steel.

Claims (2)

1. a stainless steel cold continuous-rolling roll gap method of adjustment, it is characterized in that, process control level receives roll from the production control level and reaches the initial data of wanting rolled band steel, process control level is according to described initial data, adopt roll gap computational mathematics model, calculate next with steel the gap values between rollers in stable state, current with steel the gap values between rollers when the low speed, current/next gap values between rollers with steel transient state, next is the gap values between rollers when the low speed with steel, and calculate from rolling is current and change to current/next adjustment amount of the roll gap with steel transient state with steel low speed, from current/next with the steel temporal variations to next adjustment amount of the roll gap with steel low speed of rolling, process control level will calculate next with steel the gap values between rollers in stable state, change to current/next adjustment amount of the roll gap with steel transient state with steel low speed from rolling is current, from current/next sends to Basic automation level with the steel temporal variations to next adjustment amount of the roll gap with steel low speed of rolling, Basic automation level is adjusted control according to described gap values between rollers and roll gap adjustment amount to the stainless steel cold continuous-rolling roll gap,

Described roll gap computational mathematics model is:

$S=h-\frac{P}{k}+{\mathrm{SZ}}_0+S_0+\mathrm{ds}0$

${\mathrm{ds}0}_i=\frac{{\mathrm{ds}0}_i^{\mathrm{FDT}}+{\mathrm{ds}0a}_i}{2}$

ds0a _i=sa _i-sca _i

Wherein, S is the roll gap calculated value; H is belt steel thickness; K is the milling train modulus, is to increase the required roll-force of 1mm because the mill stand distortion makes roll gap; The P draught pressure; SZ ₀roll-gap position for actual measurement after the end of school roller; S ₀for the roll gap zero value; Ds0 is adaptation coefficient; Sa _ifor current roll gap actual measured value; sca _ifor the current gap values between rollers calculated according to the roll gap computation model, in this calculating, the roll gap adaptation coefficient is got last band steel adaptation coefficient; Ds0a _ifor current band steel rider seam deviate;

for roll gap deviation value of feedback, the i.e. mean value of historical adaptation coefficient; Ds0 _ifor current band steel adaptation coefficient;

Process control level is according to the belt steel thickness, width, the yield strength that receive from the production control level, and the school roller uploaded of Basic automation level finish after Roll-gap position, roll gap zero value, the current roll gap actual measured value of actual measurement, calculate current with steel transient state, current roll gap adaptation coefficient ds0 of having slowed down while entering three states of low speed when stable state, FGC finish _iand storage, and calculate its mean value according to the historical adaptation coefficient of storage, as roll gap deviation value of feedback

;

Change to current/next adjustment amount of the roll gap with steel transient state ds=s with steel low speed from rolling is current _{next band steel transient state}-S _{current band steel low speed}, from current/next with the steel temporal variations to next adjustment amount of the roll gap with steel low speed ds=S of rolling _{next band steel low speed}-S _{next band steel is outstanding temporarily}, S wherein _{next band copper is outstanding temporarily}represent current/next gap values between rollers with steel transient state, S _{current band steel low speed}represent the current gap values between rollers during with steel low speed of rolling, S _{next band steel low speed}represent next gap values between rollers during with steel low speed of rolling.

2. stainless steel cold continuous-rolling roll gap method of adjustment according to claim 1, is characterized in that, adaptation coefficient ds0 initial value is set as 0.

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