CN103028609B

CN103028609B - Finishing mill forward slip coefficient control method for eliminating the intervening speed influence in manual operation

Info

Publication number: CN103028609B
Application number: CN201110293202.6A
Authority: CN
Inventors: 吴胜田; 车志良; 杨洪涛; 赵勐; 兰少岩
Original assignee: Angang Steel Co Ltd
Current assignee: Angang Steel Co Ltd
Priority date: 2011-09-30
Filing date: 2011-09-30
Publication date: 2014-11-05
Anticipated expiration: 2031-09-30
Also published as: CN103028609A

Abstract

The invention provides a finishing mill forward slip coefficient control method for eliminating the intervening speed influence in manual operation. The finishing mill forward slip coefficient control method for eliminating the intervening speed influence in manual operation is characterized by modifying the process control model parameter, reducing the loop learning objectives angle by 2 degrees to 3 degrees among the second to the fifth finishing mill racks and increasing the learning amount of the forward slip coefficient when the loop angle is large in the rolling process. Meanwhile, the forward slip coefficient learning strategy of process control model is modified. When the loop angle among ranks received actually is greater than and equal to 15 degrees but less than 25 degrees, the forward slip coefficient shall not be learned. The invention has the advantages of being capable of eliminating the influence of the finishing mill forward slip coefficient effectively from the manual intervening speed, obviously improving the controlling conditions of the loops. The problem that the loop angle is too large due to strip steel threading is improved. The rolling stability is improved.

Description

Eliminate the advancing slip coefficient control method of finishing mill of manually intervening rate

Technical field

The invention belongs to steel rolling automation field, be specifically related to a kind of advancing slip coefficient control method of finishing mill of manually intervening rate of eliminating for hot-continuous-rolling strip steel process.

Background technology

By a large amount of actual rolling data analysis that hot-continuous-rolling strip steel is produced, find, when band steel head threading in kink angle control procedure, there is one and be subject to operator manually to intervene rate, cause advancing slip learning coefficient to continue to worsen, the problem of influence of rolled stability.The reason that problem produces, because operator has feared cover mostly, before after-frame finishing mill is stung steel, manually reduce last finishing mill mill speed, cause band steel head kink angle to diminish, conventionally below 20 °, desired value (desired value is 30 °) lower than kink self study in process control model, thereby cause process control model self study reverse, the result of study increases the setting speed of each finishing mill, and this is the process of a circulation, be that operator manually reduces last gantry speed, make to be with steel in drawing steel state, cause being with steel head kink angle to diminish, it is advancing slip, and study is reverse, and then cause front rolling mill setting speed to increase, pulling rate tolerance also increases thereupon, final result causes advancing slip coefficient to reach lower limit, setting speed has no longer increased, pulling rate tolerance has also no longer increased a kind of like this state.In this state, as long as operator does not manually regulate the speed, with regard to easy appearance band steel, play large cover and cause the unsettled problem of as-rolled condition.

Summary of the invention

Object of the present invention aims to provide a kind of can elimination operator and manually intervene the control method with the advancing slip coefficient of steel finishing mill of rate, thereby effectively control the kink angle between each frame in advancing slip learning process, improves the stability of finish rolling rolling.

For this reason, the solution that the present invention takes is:

The advancing slip coefficient control method of finishing mill of eliminating manual intervention rate, is characterized in that,

1, modification process is controlled model parameter, and kink learning objective angle value between the 2nd～the 5th finishing mill frame is turned down to 2 °～3 °, the quantity of study of advancing slip coefficient when kink angle is large in the increase operation of rolling;

2, modification process is controlled the advancing slip coefficient learning strategy of model, increase arbitration functions, set advancing slip coefficient and do not learn angle value interval, when kink angle value between actual each frame receiving is between 25 ° of >=15 °～< time, advancing slip coefficient is not learnt, and maintains advancing slip coefficient currency constant.

Beneficial effect of the present invention is:

Implement, before the present invention, to add up continuously 133 blocks of 3.25 * 1260mm gauge strip steel, adjust in front different kink control angle situation and occur that the number of times of kink is as shown in table 1 between the 1st to the 6th finishing mill.

Table 1 is adjusted under front different kink control angles and is occurred kink number of times statistical form between the 1st～6th finishing mill

Actual kink control angle	＞30°	＞35°	＞40°	＞45°	＞50°	＞55°
							1st, between 2 frames, go out kink number of times	17	0	0	0	0	0
2nd, between 3 frames, go out kink number of times	50	27	20	16	10	6
							3rd, between 4 frames, go out kink number of times	46	17	3	3	1	0
4th, between 5 frames, go out kink number of times	31	0	0	0	0	0
							5th, between 6 frames, go out kink number of times	8	0	0	0	0	0

Implement, after the present invention, to add up continuously 157 blocks of 3.25 * 1260mm gauge strip steel, in different kink control angle situations, between the 1st to the 6th finishing mill, occur that the number of times of kink is as shown in table 2.

Under the different kink control angles of table 2 the present invention, between the 1st～6th finishing mill, there is kink number of times statistical form

Actual kink control angle	＞30°	＞35°	＞40°	＞45°	＞50°	＞55°
							1st, between 2 frames, go out kink number of times	21	0	0	0	0	0
2nd, between 3 frames, go out kink number of times	9	0	0	0	0	0
							3rd, between 4 frames, go out kink number of times	16	1	0	0	0	0
4th, between 5 frames, go out kink number of times	21	0	0	0	0	0
							5th, between 6 frames, go out kink number of times	2	0	0	0	0	0

In table 1, table 2, when actual kink control angle is between 30 °～35 °, do not implement to occur between each frame of the present invention that the number of times of kink is 152 times, implement to occur that the number of times of kink only has 69 times, has reduced 83 times after the present invention; And when actual kink control angle is when more than 35 °, do not implement to occur between each frame of the present invention that the number of times of kink is 103 times, implement to occur that the number of times of kink only has 1 time after the present invention.Especially between the 2nd, 3 frames, the number of times of not implementing to occur kink before the present invention, up to 129 times, implements only to occur 9 times after the present invention, and when actual kink control angle is when more than 35 °, the number of times that occurs kink is still 79 times, after enforcement the present invention, is 0 time.As can be seen here, the present invention can effectively eliminate the impact of manual intervention speed on the advancing slip coefficient of finishing mill, significantly improves kink and controls situation, and the large problem of kink angle causing while reducing with steel threading, improves the stability of rolling.

The specific embodiment

Embodiment:

The concrete steps that the present invention eliminates the advancing slip coefficient control method of finishing mill of manual intervention rate are:

1, modification process is controlled model parameter, and kink learning objective angle value between the 2nd～the 5th finishing mill frame is turned down to 2 °～3 °, the quantity of study of advancing slip coefficient when kink angle is large in the increase operation of rolling.Design parameter is as shown in table 3.

Table 3 process control model parameter list

Kink position	L1	L2	L3	L4	L5
						Kink standard angle (°)	28	30	30	30	28
Kink learning objective angle (°)	28	27	28	28	28

In table 3, L1 represents kink between the 1st, 2 frames; L2 represents kink between the 2nd, 3 frames; L3 represents kink between the 3rd, 4 frames; L4 represents kink between the 4th, 5 frames; L5 represents kink between the 5th, 6 frames.

2, modification process is controlled the advancing slip coefficient learning strategy of model, increase arbitration functions, set advancing slip coefficient and do not learn angle value interval, when kink between actual each frame receiving is L1～L5 angle value between 25 ° of >=15 °～< time, advancing slip coefficient is not learnt, advancing slip value does not change, and still maintains currency constant.

Claims

1. eliminate the advancing slip coefficient control method of finishing mill of manually intervening rate, it is characterized in that,

(1), modification process controls model parameter, and kink learning objective angle value between the 2nd～the 5th finishing mill frame is turned down to 2 °～3 °, increases in the operation of rolling quantity of study of advancing slip coefficient when kink angle is large;

(2), modification process is controlled the advancing slip coefficient learning strategy of model, increase arbitration functions, set advancing slip coefficient and do not learn angle value interval, when kink angle value between actual each frame receiving is between 25 ° of >=15 °～< time, advancing slip coefficient is not learnt, and maintains advancing slip coefficient currency constant.