CN103394524A - Thickness compensation rolling method - Google Patents
Thickness compensation rolling method Download PDFInfo
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- CN103394524A CN103394524A CN2013103231056A CN201310323105A CN103394524A CN 103394524 A CN103394524 A CN 103394524A CN 2013103231056 A CN2013103231056 A CN 2013103231056A CN 201310323105 A CN201310323105 A CN 201310323105A CN 103394524 A CN103394524 A CN 103394524A
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Abstract
The invention belongs to the field of hot continuous rolling, in particular a thickness compensation rolling method in the automatic control process of hot continuous rolling metallurgy. In the absence of strip steel in rolling machines, rolling pressure of each frame is increased to 1500t; meanwhile, the value of roll gap is zero; a computer L1 acquires a zeroing signal and transmits the signal, in a message form, to a computer L2 zeroing program; when the computer L2 zeroing program receives a signal indicating the completion of zeroing acquisition by the computer L1, a first steel block is confirmed; after zeroing, thickness compensation for the first steel block is calculated according to the formula: then<1>=then<a>+th_cof. After application of the method, field rolling stability is higher, production efficiency is higher and product quality is higher.
Description
Technical field
The invention belongs to the hot continuous rolling field, specifically a kind of thickness compensation milling method of hot continuous rolling metallurgical automation control procedure.
Background technology
This programme is a kind of special milling method of inventing for the present situation of the product structure feature of Taiyuan Iron and Steel Co. (Shanxi Taigang Stainless Steel Co., Ltd) 1549 hot continuous rolling production lines and ageing equipment.The purpose of this control technology is mainly on the basis of existing equipment, improves the rolling accuracy of product, the amount of reducing the number of rejects and seconds.As shown in Figure 2, in figure, each regional implication is the apparatus arrangement of Taiyuan Iron and Steel Co. 1549 hot continuous rolling production lines: 1. heating furnace (4); 2. high-pressure water descaling case; 3. rough rolling vertical roller mill (VE0); 4. roughing flat roll mill (R0); 5. stay-warm case; 6. rotary drum crop flying shear; 7. finishing stand (7 add frame); 8. profile gauge; 9. width gage; 10. calibrator; 11. Straightness Meter; 12. coiling machine.The main production process of this hot continuous rolling production line is that at first slab heats in the temperature of heating furnace according to process stipulation, being heated to after target temperature at first to enter roughing mill is rolled, wherein roughing vertical roll is controlled width, plain-barreled roll is controlled thickness,, through the rolling of roughing unit, make the band steel reach predefined target thickness, width and temperature.Enter again afterwards mm finishing mill unit and carry out seven frame continuous rollings, make the band steel reach predefined target thickness, temperature.To be with steel to be configured as coil of strip by coiling machine finally.This patent is mainly a kind of milling method of inventing for the rolling of mm finishing mill unit, this hot continuous rolling production line is owing to being the second-hand equipment of introducing from Japan in 1994, though through repeatedly transformation, but the main equipments such as memorial archway remain original equipment, ageing equipment is obvious, and ageing equipment causes equipment precision to reduce.It is that after each roll change, mm finishing mill unit is carried out acyclic homologically trioial that equipment precision reduces the most significantly performance, after acyclic homologically trioial, first of rolling steel thickness and precision is low, often occur exceeding the thickness deviation of customer requirements and cause waste product to occur, namely after acyclic homologically trioial, first steel rolling can not meet the Product Precision requirement.
Summary of the invention
Technical problem to be solved by this invention is:, in the situation that current continous hot rolling facility is aging, solves the difficult problem of control accuracy by adopting new special control method, thereby meet the Product Precision requirement.
The control system of hot continuous rolling adopts two-stage computer control, be that process control computer (L2 computer) is controlled and basic automatization computer (L1) control, this programme is mainly the THICKNESS CONTROL for mm finishing mill unit, the THICKNESS CONTROL process as shown in Figure 1, this programme to the effect that for the L2 computer, the control method of thickness aspect has been carried out inventive improvements.Before patent working, the control procedure of THICKNESS CALCULATION aspect is: determine finish rolling target thickness then; Be finished product (finish rolling outlet) thickness according to supplied materials (roughing outlet) thickness, finish rolling target thickness, determine each frame reduction ratio.
Wherein, I represents finishing mill F0～F6 shelf number, and each frame value is respectively 0,1,2,3,4,5,6;
Represent each frame reduction ratio;
Represent each frame inlet thickness;
Represent each frame exit thickness.The process allocation regulation of each frame inlet thickness and exit thickness basic of distribution finish rolling supplied materials thickness, exit thickness and each steel grade is determined.Calculate again the parameters such as the draught pressure of every frame and roll gap according to the reduction ratio that calculates, under send L1 to carry out.Because ageing equipment and open rolling breed structure change, above-mentioned calculating can not meet the requirement of first steel control accuracy after acyclic homologically trioial, is to solve a difficult problem that exists, a kind of thickness compensation milling method of this programme invention.
The technical solution adopted in the present invention is: a kind of thickness compensation milling method, carry out according to following step:
After every steel rolling was completed, the L2 computer made the following judgment:
If variable strips_after_rs〉0, subtract 1, that is: strips_after_rs=strips_after_rs – 1;
, if variable strips_after_rs is 0, do not do any processing.
When every block of steel calculates, all to make the following judgment:
1) if variable strips_after_rs〉0, be first block of steel after acyclic homologically trioial;
2), if variable strips_after_rs is 0, not first block of steel after acyclic homologically trioial.
The invention has the beneficial effects as follows: the art of this patent has improved on-the-spot rolling stability, has improved production efficiency and product quality after implementing.
Description of drawings
Fig. 1 is THICKNESS CONTROL process schematic diagram of the present invention;
Fig. 2 is the apparatus arrangement of Taiyuan Iron and Steel Co. (Shanxi Taigang Stainless Steel Co., Ltd) 1549 hot continuous rolling production lines;
Wherein: 1. heating furnace (4); 2. high-pressure water descaling case; 3. rough rolling vertical roller mill (VE0); 4. roughing flat roll mill (R0); 5. stay-warm case; 6. rotary drum crop flying shear; 7. finishing stand (7 add frame); 8. profile gauge; 9. width gage; 10. calibrator; 11. Straightness Meter; 12. coiling machine.
The specific embodiment
The straight carbon steel kind that this embodiment uses is Q235A, and its concrete composition (%) is as follows: C:0.17, Si:0.15, Mn:0.39, P:0.01, S:0.01, Al:0.03, Cr:0.05, Cu:0.01, Mo:0, Ti:0, Ni:0.02, V:0, Nb:0, N:0, B:0.
Flow process according to Fig. 2 is processed the Q235A continuous casting steel billet, and the size of this Q235A continuous casting steel billet is: thickness 220mm, width 1130mm, length 9.2m.This embodiment control system adopts two-stage computer control, and namely process control computer (L2 computer) is controlled with basic automatization computer (L1) and controlled.Change the working roll of finishing mill, redefine the roll gap zero-bit of milling train according to milling train both sides roll-force and the poor situation of oil column.
The Q235A continuous casting steel billet is sequentially carried out heat treated at heating furnace 0#, and wherein the heating-up temperature of 0# heating furnace is 1250 ℃, and be 200 minutes heat time heating time.
Q235A continuous casting steel billet after heat treated enters the high-pressure water descaling case, with the water that pressure is 17MPa, rinses 9.2 seconds.
Q235A continuous casting plate after high-pressure water descaling enters roughing mill, and roughing vertical roll is controlled width, and plain-barreled roll is controlled thickness.Through the rolling of roughing unit, the belt steel thickness that obtains is that 40mm, width are 1100mm, and temperature is 1100 ℃.
Mm finishing mill unit comprises 7 finishing stands, the exit thickness of the 7th finishing stand of original start
For 3.5mm, process control computer (L2 computer) is according to formula
Calculate first steel band finish rolling thickness, wherein
Get 0.1mm.
Finish rolling condition with steel after according to above-mentioned compensation enters mm finishing mill unit and carries out continuous rolling, and the rolling condition of 7 finishing mills is as follows:
| ? | 1# | 2# | 3# | 4# | 5# | 6# | 7# |
| Inlet temperature | 1035 | 1010 | 988 | 968 | 944 | 928 | 915 |
| Reduction ratio | 33.5% | 37.8% | 36.5% | 27.8% | 24.3% | 26.8% | 15.6% |
After above-mentioned finish rolling, first thickness with steel that obtains is 3.48mm, and all the other thickness with steel are 3.5mm ± 0.03mm, meet customer requirement.To be with steel to be configured as coil of strip by coiling machine finally.
The low-alloy steel that this embodiment uses is SPAH, and its concrete composition (%) is as follows: C:0.09, Si:0.47, Mn:0.4, P:0.01, S:0.01, Al:0, Cr:0.36, Cu:0.27, Mo:0, Ti:0, Ni:0.12, V:0, Nb:0, N:0, B:0.
Flow process according to Fig. 2 is processed the SPAH continuous casting steel billet, and the size of this SPAH continuous casting steel billet is: thickness 220mm, width 1130mm, length 8.15m.This embodiment control system adopts two-stage computer control, and namely process control computer (L2 computer) is controlled with basic automatization computer (L1) and controlled.Change the working roll of finishing mill, redefine the roll gap zero-bit of milling train according to milling train both sides roll-force and the poor situation of oil column.
The SPAH continuous casting steel billet is sequentially carried out heat treated at heating furnace 0#, and wherein the heating-up temperature of 0# heating furnace is 1250 ℃, and be 200 minutes heat time heating time.
SPAH continuous casting steel billet after heat treated enters the high-pressure water descaling case, with the water that pressure is 17MPa, rinses 8.2 seconds.
SPAH continuous casting plate after high-pressure water descaling enters roughing mill, and roughing vertical roll is controlled width, and plain-barreled roll is controlled thickness.Through the rolling of roughing unit, the belt steel thickness that obtains is that 40mm, width are 1125mm, and temperature is 1110 ℃.
Mm finishing mill unit comprises 7 finishing stands, the exit thickness of the 7th finishing stand of original start
For 3.5mm, width is 1100mm, and temperature is 860 ℃, and process control computer (L2 computer) is according to formula
Calculate first steel band finish rolling thickness,
Get 0.06mm.
Finish rolling condition with steel after according to above-mentioned compensation enters mm finishing mill unit and carries out continuous rolling, and the rolling condition of 7 finishing mills is as follows:
| ? | 1# | 2# | 3# | 4# | 5# | 6# | 7# |
| Inlet temperature (℃) | 1029 | 997 | 969 | 944 | 915 | 895 | 877 |
| Reduction ratio (%) | 46.5 | 38.6 | 34.3 | 26.8 | 23.9 | 16.8 | 11.6 |
After above-mentioned finish rolling, first thickness with steel that obtains is 3.49mm, and all the other thickness with steel are 3.5mm ± 0.03mm, meet customer requirement.To be with steel to be configured as coil of strip by coiling machine finally.
The soft steel that this embodiment uses is TIF, and its concrete composition (mass percent) is as follows: C:0.09, Si:0.02, Mn:0.36, P:0.007, S:0.007, Al:0.07, Cr:0.02, Cu:0.01, Mo:0, Ti:0, Ni:0.02, V:0, Nb:0, N:0, B:0.
Flow process according to Fig. 2 is processed the TIF continuous casting steel billet, and the size of this TIF continuous casting steel billet is: thickness 220mm, width 1130mm, length 9.0m.This embodiment control system adopts two-stage computer control, and namely process control computer (L2 computer) is controlled with basic automatization computer (L1) and controlled.Change the working roll of finishing mill, redefine the roll gap zero-bit of milling train according to milling train both sides roll-force and the poor situation of oil column.
The TIF continuous casting steel billet is sequentially carried out heat treated at heating furnace 2#, and wherein the heating-up temperature of 2# heating furnace is 1250 ℃, and be 190 minutes heat time heating time.
TIF continuous casting steel billet after heat treated enters high-pressure water descaling case pressure, with the water that pressure is 17MPa, rinses 9 seconds.
TIF continuous casting plate after high-pressure water descaling enters roughing mill, and roughing vertical roll is controlled width, and plain-barreled roll is controlled thickness.Through the rolling of roughing unit, the belt steel thickness that obtains is that 40mm, width are 1100mm, and temperature is 1090 ℃.
Mm finishing mill unit comprises 7 finishing stands, the exit thickness of the 7th finishing stand of original start
For 3.5mm, width is 1100mm, 920 ℃ of temperature, and process control computer (L2 computer) is according to formula
Calculate first steel band finish rolling thickness,
Get 0.18mm.
Finish rolling condition with steel after according to above-mentioned compensation enters mm finishing mill unit and carries out continuous rolling, and the rolling condition of 7 finishing mills is as follows:
| ? | 1# | 2# | 3# | 4# | 5# | 6# | 7# |
| Inlet temperature (℃) | 1007 | 987 | 970 | 954 | 935 | 923 | 912 |
| Reduction ratio (%) | 42.0 | 34.0 | 36.3 | 27.3 | 23.5 | 20.4 | 15.1 |
After above-mentioned finish rolling, first thickness with steel that obtains is 3.48mm, and all the other thickness with steel are 3.5mm ± 0.03mm, meet customer requirement.To be with steel to be configured as coil of strip by coiling machine finally.
The stainless steel that this embodiment uses is SUS304, and its concrete composition (mass percent) is as follows: C:0.05, Si:0.45, Mn:1.14, P:0.03, S:0.002, Al:0, Cr:18.19, Cu:0, Mo:0.07, Ti:0, Ni:8.02, V:0, Nb:0, N:0.04, B:0.
Flow process according to Fig. 2 is processed the SUS304 continuous casting steel billet, and the size of this SUS304 continuous casting steel billet is: thickness 180mm, width 1130mm, length 10.1m.This embodiment control system adopts two-stage computer control, and namely process control computer (L2 computer) is controlled with basic automatization computer (L1) and controlled.Change the working roll of finishing mill, redefine the roll gap zero-bit of milling train according to milling train both sides roll-force and the poor situation of oil column.
The SUS304 continuous casting steel billet is sequentially carried out heat treated at heating furnace 3#, and wherein the heating-up temperature of 2# heating furnace is 1240 ℃, and be 210 minutes heat time heating time.
SUS304 continuous casting steel billet after heat treated enters the high-pressure water descaling case, with the water that pressure is 17MPa, rinses 10.1 seconds.
SUS304 continuous casting plate after high-pressure water descaling enters roughing mill, and roughing vertical roll is controlled width, and plain-barreled roll is controlled thickness.Through the rolling of roughing unit, the belt steel thickness that obtains is that 35mm, width are 1100mm, and temperature is 1090 ℃.
Mm finishing mill unit comprises 7 finishing stands, the exit thickness of the 7th finishing stand of original start
For 3.5mm, width is 1100mm, 980 ℃ of temperature.Process control computer (L2 computer) is according to formula
Calculate first steel band finish rolling thickness,
Get 0.06mm.
Finish rolling condition with steel after according to above-mentioned compensation enters mm finishing mill unit and carries out continuous rolling, and the rolling condition of 7 finishing mills is as follows:
| ? | 1# | 2# | 3# | 4# | 5# | 6# | 7# |
| Inlet temperature (℃) | 1011 | 991 | 973 | 957 | 937 | 924 | 912 |
| Reduction ratio (%) | 26.6 | 28.4 | 33.1 | 25.4 | 18.8 | 13.9 | 11.0 |
After above-mentioned finish rolling, first thickness with steel that obtains is 3.51mm, and all the other thickness with steel are 3.5mm ± 0.03mm, meet customer requirement.To be with steel to be configured as coil of strip by coiling machine finally.
Claims (1)
1. thickness compensation milling method is characterized in that: according to following step, carry out:
Step 1, first block of steel after the identification acyclic homologically trioial, in the situation that be not with steel that every frame draught pressure is increased to 1500 tons in milling train, the gap values between rollers of this moment is as 0, L1 computer acquisition acyclic homologically trioial signal, this signal is reached L2 computer acyclic homologically trioial program by message mode, first block of steel after this piece steel is acyclic homologically trioial when L2 computer acyclic homologically trioial program is received L1 computer acquisition acyclic homologically trioial settling signal;
Step 2, after acyclic homologically trioial, first steel thickness compensation formula is calculated as follows:
, in formula,
The target thickness of last frame of expression finish rolling; Wherein,
Thickness after last frame export restitution of expression finish rolling,
The expression thickness compensation factor.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109877165A (en) * | 2019-04-10 | 2019-06-14 | 北京科技大学设计研究院有限公司 | A kind of automatic acyclic homologically trioial method containing roll neck compensating for variations after roll change |
| CN110743921A (en) * | 2019-09-27 | 2020-02-04 | 张家港扬子江冷轧板有限公司 | Compensation method for thickness of acid rolling |
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| US3766761A (en) * | 1971-10-07 | 1973-10-23 | Wean United Inc | Rolling mill control |
| CN102371279A (en) * | 2010-08-26 | 2012-03-14 | 宝山钢铁股份有限公司 | Adaptive control method for increasing thickness precision of finish-rolled band steel by utilizing roll gap |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3766761A (en) * | 1971-10-07 | 1973-10-23 | Wean United Inc | Rolling mill control |
| CN102371279A (en) * | 2010-08-26 | 2012-03-14 | 宝山钢铁股份有限公司 | Adaptive control method for increasing thickness precision of finish-rolled band steel by utilizing roll gap |
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| 古可等: "《论轧机驱动与节能》", 31 July 1986, 中南工业大学出版社 * |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109877165A (en) * | 2019-04-10 | 2019-06-14 | 北京科技大学设计研究院有限公司 | A kind of automatic acyclic homologically trioial method containing roll neck compensating for variations after roll change |
| CN110743921A (en) * | 2019-09-27 | 2020-02-04 | 张家港扬子江冷轧板有限公司 | Compensation method for thickness of acid rolling |
| CN110743921B (en) * | 2019-09-27 | 2021-11-30 | 张家港扬子江冷轧板有限公司 | Compensation method for thickness of acid rolling |
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