CN103394524B - A kind of thickness compensation milling method - Google Patents
A kind of thickness compensation milling method Download PDFInfo
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- CN103394524B CN103394524B CN201310323105.6A CN201310323105A CN103394524B CN 103394524 B CN103394524 B CN 103394524B CN 201310323105 A CN201310323105 A CN 201310323105A CN 103394524 B CN103394524 B CN 103394524B
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- 238000003801 milling Methods 0.000 title abstract 3
- 238000005096 rolling process Methods 0.000 claims abstract description 80
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 70
- 239000010959 steel Substances 0.000 claims abstract description 70
- 238000000034 method Methods 0.000 claims abstract description 19
- 239000002436 steel type Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 125000002015 acyclic group Chemical group 0.000 abstract 6
- 238000010438 heat treatment Methods 0.000 description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- 238000009749 continuous casting Methods 0.000 description 10
- 238000004886 process control Methods 0.000 description 9
- 230000032683 aging Effects 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000013072 incoming material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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Abstract
The invention belongs to hot continuous rolling field, specifically a kind of thickness compensation milling method of hot continuous rolling metallurgical automation control procedure.Be not with in milling train when steel and every frame draught pressure is increased to 1500 tons, gap values between rollers is now as 0, L1 computer acquisition acyclic homologically trioial signal, this signal is reached L2 computer acyclic homologically trioial program by message mode, when L2 computer acyclic homologically trioial program receives L1 computer acquisition acyclic homologically trioial settling signal this block steel be acyclic homologically trioial after first block of steel; After acyclic homologically trioial, first piece of steel thickness compensation formula is calculated as follows:
.The art of this patent improves on-the-spot rolling stability, improves production efficiency and product quality after implementing.
Description
Technical Field
The invention belongs to the field of hot continuous rolling, and particularly relates to a thickness compensation rolling method in an automatic control process of hot continuous rolling metallurgy.
Background
The scheme is a special rolling method invented aiming at the product structure characteristics and the equipment aging current situation of a Tai steel (Shanxi Tai Steel stainless Steel Co., Ltd.) 1549 hot continuous rolling production line. The control technology mainly aims to improve the rolling precision of products and reduce the waste product quantity on the basis of the existing equipment. The equipment layout of the Tai steel 1549 hot continuous rolling production line is shown in figure 2, wherein the meaning of each area in the figure is as follows: 1. a heating furnace (4 seats); 2. a high-pressure water descaling box; 3. a roughing edger (VE 0); 4. a roughing flat roll mill (R0); 5. a heat-preserving cover; 6. rotary drum type crop flying shears; 7. finishing mill frames (7 additional frames); 8. a convexity meter; 9. a width gauge; 10. a thickness gauge; 11. a flatness meter; 12. a coiling machine. The main production process of the hot continuous rolling production line comprises the steps that a plate blank is firstly heated in a heating furnace according to the temperature specified by the process, and is firstly fed into a roughing mill for rolling after being heated to the target temperature, wherein the width of a roughing vertical roll is controlled, the thickness of a flat roll is controlled, and the strip steel is rolled by a roughing mill set to reach the preset target thickness, width and temperature. And then the strip steel enters a finishing mill group to carry out seven-stand continuous rolling so as to enable the strip steel to reach the preset target thickness and temperature. And finally, forming the strip steel into a steel coil through a coiling machine. The hot continuous rolling production line is a second-hand device introduced from Japan in 1994, although the hot continuous rolling production line is repeatedly modified, main devices such as memorial archways are still original devices, the device aging is obvious, and the device accuracy is reduced due to the device aging. The most obvious performance of the reduction of the equipment precision is that the finishing mill set performs zero adjustment after each roll change, the thickness precision of the first steel rolled after the zero adjustment is low, and the thickness tolerance exceeding the requirement of a user often causes waste products, namely, the first steel rolled after the zero adjustment can not meet the requirement of the product precision.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: under the condition that the current hot continuous rolling equipment is aged, the problem of control precision is solved by adopting a new special control method, so that the requirement on product precision is met.
The control system of the hot continuous rolling adopts two-stage computer control, namely, the control of a process control computer (L2 computer) and the control of a basic automation computer (L1), the scheme mainly aims at the thickness control of a finishing mill group, the thickness control process is shown in figure 1, and the main content of the scheme is that the control method of the L2 computer in the aspect of the thickness is creatively improved. Before patent applicationThe control process in the aspect of thickness calculation is as follows: determining the finish rolling target thickness then; and determining the reduction rate of each machine frame according to the thickness of the supplied materials (rough rolling outlet) and the thickness of the finish rolling target, namely the thickness of the finished product (finish rolling outlet).Wherein I represents the frame numbers of finish rolling mills F0-F6, and the values of all frames are respectively 0, 1, 2, 3, 4, 5 and 6;expressing the reduction rate of each frame;representing the thickness of each rack entrance;showing the exit thickness of each rack. The inlet thickness and outlet thickness distribution of each stand is determined according to the finish rolling incoming material thickness, the outlet thickness and the process distribution specification of each steel type. And calculating parameters such as rolling pressure and roll gap of each stand according to the calculated reduction ratio, and performing downward feeding L1. Due to equipment aging and the structural change of initial rolling varieties, the calculation cannot meet the requirement of the control precision of the first steel after zero adjustment, and in order to solve the existing problems, the invention provides a thickness compensation rolling method.
The technical scheme adopted by the invention is as follows: a thickness compensation rolling method comprises the following steps:
firstly, the finish rolling mill must accurately control the roll gap of the rolling mill in the rolling process, which is closely related to the zero position determination of the roll gap, so that the zero position (zero adjustment for short, the roll gap value is taken as 0) of the roll gap of the rolling mill must be determined again according to the conditions of rolling force and oil column difference at two sides of the rolling mill after a working roll or a supporting roll is replaced each time. Identifying a first steel after zero adjustment, increasing the rolling pressure of each stand to 1500 tons under the condition that no strip steel exists in a rolling mill, taking the roll gap value as 0, acquiring a zero adjustment signal by an L1 computer, transmitting the signal to an L2 computer zero adjustment program in a message mode, and when the L2 computer zero adjustment program receives a zero adjustment completion signal acquired by an L1 computer (the roll gap values of a plurality of rolling mills are zero at the same time), enabling the first steel after zero adjustment to be the first steel; to identify the first steel after zeroing when using the L2 computer, a count variable, strips _ after _ rs, is added to the L2 zeroing procedure, and when the L1 computer zeroing signal is received by the zeroing procedure, strips _ after _ rs is set to 1, that is: strips _ after _ rs = 1. When the L2 computer carries out finish rolling calculation on the strip steel, if the strips _ after _ rs is judged to be 1, the steel is the first steel after zero adjustment.
After each steel is rolled, the L2 computer makes the following judgments:
if the variable strips _ after _ rs >0, then 1 is decremented, i.e.: strips _ after _ rs = strips _ after _ rs-1;
if the variable strips _ after _ rs is 0, no processing is done.
When each piece of steel is calculated, the following judgment is carried out:
1) if the variable strips _ after _ rs >0, the first steel is zero-adjusted;
2) if the variable strips _ after _ rs is 0, the steel is not the first steel after zero adjustment.
Step two, calculating a thickness compensation formula of the first steel after zero adjustment according to the following formula:in the formula (I), wherein,representing the target thickness of the last stand of the finish rolling; wherein,showing the compensated thickness at the outlet of the last stand in finish rolling,thickness of the filmA compensation factor.
The specific numerical values of the method are used for establishing a table model according to experience and experiments, wherein the table model is as follows:
the invention has the beneficial effects that: after the technology of the patent is implemented, the stability of field rolling is improved, and the production efficiency and the product quality are improved.
Drawings
FIG. 1 is a schematic view of a thickness control process of the present invention;
FIG. 2 is an equipment layout of a Tai Steel (Shanxi Tai Steel stainless Steel Co., Ltd.) 1549 hot continuous rolling line;
wherein: 1. a heating furnace (4 seats); 2. a high-pressure water descaling box; 3. a roughing edger (VE 0); 4. a roughing flat roll mill (R0); 5. a heat-preserving cover; 6. rotary drum type crop flying shears; 7. finishing mill frames (7 additional frames); 8. a convexity meter; 9. a width gauge; 10. a thickness gauge; 11. a flatness meter; 12. a coiling machine.
Detailed Description
Example 1
The general carbon steel used in this example was Q235A, and its specific composition (%) was 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.
the continuous cast slab Q235A was processed according to the flow of fig. 2, the dimensions of the continuous cast slab Q235A were: thickness 220mm, width 1130mm, length 9.2 m. The control system of this embodiment employs two levels of computer control, namely process control computer (L2 computer) control and basic automation computer (L1) control. And replacing the working rolls of the finishing mill, and re-determining the zero position of the roll gap of the rolling mill according to the rolling force and the oil column difference of the two sides of the rolling mill.
The continuous casting slab Q235A was sequentially subjected to heating treatment in a heating furnace No. 0, wherein the heating temperature of the heating furnace No. 0 was 1250 ℃ and the heating time was 200 minutes.
The heated Q235A continuous casting slab enters a high-pressure water descaling box and is washed by water with the pressure of 17MPa for 9.2 seconds.
And (3) feeding the Q235A continuously cast plate subjected to high-pressure water descaling into a roughing mill, controlling the width of a roughing vertical roll and controlling the thickness of a flat roll. The thickness of the obtained strip steel is 40mm, the width of the obtained strip steel is 1100mm, and the temperature of the obtained strip steel is 1100 ℃.
The finishing mill group comprises 7 finishing mill frames, and the outlet thickness of the seventh finishing mill frame is originally set3.5mm, the process control computer (L2 computer) is according to the formulaCalculating a finish rolling thickness of the first steel strip, whereinTake 0.1 mm.
And (3) the strip steel enters a finishing mill group for continuous rolling according to the compensated finish rolling conditions, and the rolling conditions of 7 finishing mills are 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 the finish rolling, the thickness of the first strip steel is 3.48mm, and the thickness of the rest strip steels is 3.5mm +/-0.03 mm, so that the requirements of customers are met. And finally, forming the strip steel into a steel coil through a coiling machine.
Example 2
The low alloy steel used in this example was SPAH, and its specific composition (%) was 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.
the SPAH continuous cast slab was processed according to the flow of fig. 2, and the dimensions of the SPAH continuous cast slab were: thickness 220mm, width 1130mm, length 8.15 m. The control system of this embodiment employs two levels of computer control, namely process control computer (L2 computer) control and basic automation computer (L1) control. And replacing the working rolls of the finishing mill, and re-determining the zero position of the roll gap of the rolling mill according to the rolling force and the oil column difference of the two sides of the rolling mill.
The SPAH continuous casting slabs were sequentially subjected to heating treatment in a heating furnace No. 0, wherein the heating temperature of the heating furnace No. 0 was 1250 ℃ and the heating time was 200 minutes.
The heated SPAH continuous casting plate blank enters a high-pressure water descaling box and is washed by water with the pressure of 17MPa for 8.2 seconds.
And (3) feeding the SPAH continuously cast plate after descaling by high-pressure water into a roughing mill, controlling the width of a roughing vertical roll and controlling the thickness of a flat roll. The thickness of the obtained strip steel is 40mm, the width of the obtained strip steel is 1125mm, and the temperature of the obtained strip steel is 1110 ℃.
The finishing mill group comprises 7 finishing mill frames, and the outlet thickness of the seventh finishing mill frame is originally set3.5mm, 1100mm in width, 860 ℃ temperature, process control computer (L2 computer) according to the formulaCalculating the first blockThe thickness of the steel strip is finely rolled,take 0.06 mm.
And (3) the strip steel enters a finishing mill group for continuous rolling according to the compensated finish rolling conditions, and the rolling conditions of 7 finishing mills are as follows:
| 1# | 2# | 3# | 4# | 5# | 6# | 7# | |
| inlet temperature (. degree.C.) | 1029 | 997 | 969 | 944 | 915 | 895 | 877 |
| Reduction ratio (%) | 46.5 | 38.6 | 34.3 | 26.8 | 23.9 | 16.8 | 11.6 |
After the finish rolling, the thickness of the first strip steel is 3.49mm, and the thickness of the rest strip steels is 3.5mm +/-0.03 mm, so that the requirements of customers are met. And finally, forming the strip steel into a steel coil through a coiling machine.
Example 3
The soft steel used in this example is TIF, and its specific components (mass%) are 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.
the TIF continuous cast slab was processed according to the flow of FIG. 2, the dimensions of which were: thickness 220mm, width 1130mm, length 9.0 m. The control system of this embodiment employs two levels of computer control, namely process control computer (L2 computer) control and basic automation computer (L1) control. And replacing the working rolls of the finishing mill, and re-determining the zero position of the roll gap of the rolling mill according to the rolling force and the oil column difference of the two sides of the rolling mill.
The TIF continuous cast slabs were sequentially subjected to heating treatment in a heating furnace No. 2, wherein the heating temperature of the heating furnace No. 2 was 1250 ℃ and the heating time was 190 minutes.
And (3) feeding the heated TIF continuous casting slab into a high-pressure water descaling box, and washing the TIF continuous casting slab for 9 seconds by using water with the pressure of 17 MPa.
And (3) feeding the TIF continuously cast plate subjected to high-pressure water descaling into a roughing mill, controlling the width of a roughing vertical roll and controlling the thickness of a flat roll. The thickness of the obtained strip steel is 40mm, the width of the obtained strip steel is 1100mm, and the temperature of the obtained strip steel is 1090 ℃ through rolling by a roughing mill group.
The finishing mill group comprises 7 finishing mill frames, and the outlet thickness of the seventh finishing mill frame is originally set3.5mm, 1100mm in width, 920 ℃ in temperature, and a process control computer (L2 computer) according to the formulaCalculating the finish rolling thickness of the first steel strip,take 0.18 mm.
And (3) the strip steel enters a finishing mill group for continuous rolling according to the compensated finish rolling conditions, and the rolling conditions of 7 finishing mills are as follows:
| 1# | 2# | 3# | 4# | 5# | 6# | 7# | |
| inlet temperature (. degree.C.) | 1007 | 987 | 970 | 954 | 935 | 923 | 912 |
| Reduction ratio (%) | 42.0 | 34.0 | 36.3 | 27.3 | 23.5 | 20.4 | 15.1 |
After the finish rolling, the thickness of the first strip steel is 3.48mm, and the thickness of the rest strip steels is 3.5mm +/-0.03 mm, so that the requirements of customers are met. And finally, forming the strip steel into a steel coil through a coiling machine.
Example 4
The stainless steel used in this example was SUS304, and its specific composition (mass%) was 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.
an SUS304 continuous casting slab was processed according to the flow of fig. 2, and the dimensions of the SUS304 continuous casting slab were: 180mm in thickness, 1130mm in width and 10.1m in length. The control system of this embodiment employs two levels of computer control, namely process control computer (L2 computer) control and basic automation computer (L1) control. And replacing the working rolls of the finishing mill, and re-determining the zero position of the roll gap of the rolling mill according to the rolling force and the oil column difference of the two sides of the rolling mill.
The SUS304 continuous casting slabs were sequentially subjected to heating treatment in a heating furnace No. 3, wherein the heating temperature of the heating furnace No. 2 was 1240 ℃ and the heating time was 210 minutes.
The SUS304 continuous casting slab after the heat treatment was put into a high-pressure water descaling box and washed with water under a pressure of 17MPa for 10.1 seconds.
And (3) feeding the SUS304 continuously cast plate descaled by high-pressure water into a roughing mill, controlling the width of a roughing vertical roll and controlling the thickness of a flat roll. The thickness of the obtained strip steel is 35mm, the width of the obtained strip steel is 1100mm, and the temperature of the obtained strip steel is 1090 ℃ through rolling of a roughing mill group.
The finishing mill group comprises 7 finishing mill frames, and the outlet thickness of the seventh finishing mill frame is originally set3.5mm, width 1100mm, temperature 980 ℃. The process control computer (L2 computer) follows the formulaCalculating the finish rolling thickness of the first steel strip,take 0.06 mm.
And (3) the strip steel enters a finishing mill group for continuous rolling according to the compensated finish rolling conditions, and the rolling conditions of 7 finishing mills are as follows:
| 1# | 2# | 3# | 4# | 5# | 6# | 7# | |
| inlet temperature (. degree.C.) | 1011 | 991 | 973 | 957 | 937 | 924 | 912 |
| Reduction ratio (%) | 26.6 | 28.4 | 33.1 | 25.4 | 18.8 | 13.9 | 11.0 |
After the finish rolling, the thickness of the first strip steel is 3.51mm, and the thickness of the rest strip steels is 3.5mm +/-0.03 mm, so that the requirements of customers are met. And finally, forming the strip steel into a steel coil through a coiling machine.
Claims (1)
1. A thickness compensation rolling method is characterized in that: the method comprises the following steps:
step one, identifying a first steel after zero adjustment, increasing the rolling pressure of each stand to 1500 tons under the condition that no strip steel exists in a rolling mill, taking the roll gap value as 0, acquiring a zero adjustment signal by an L1 computer, transmitting the signal to an L2 computer zero adjustment program in a message mode, and when the L2 computer zero adjustment program receives a zero adjustment completion signal acquired by an L1 computer, determining the first steel after zero adjustment;
step two, compensating the thickness of the first steel after zero adjustmentThe formula is calculated as follows:in the formula (I), wherein,representing the target thickness of the last stand of the finish rolling; wherein,showing the compensated thickness at the outlet of the last stand in finish rolling,expressing thickness compensation factors, and performing a form model of the thickness compensation factors according to the steel type, the thickness and the width of the strip steel
To select.
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| CN109877165B (en) * | 2019-04-10 | 2020-06-26 | 北京科技大学设计研究院有限公司 | Automatic zero adjustment method for roll change compensation after roll change |
| 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 |
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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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 |
Non-Patent Citations (1)
| Title |
|---|
| 提高柳钢1450mm热连轧带钢尺寸精度的措施;宁子识等;《2012年全国轧钢生产技术会论文集（上）》;20120814;第237-242页 * |
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