CN105522003A - Sectional cooling control method for low-cost hot-rolled strip steel - Google Patents
Sectional cooling control method for low-cost hot-rolled strip steel Download PDFInfo
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- CN105522003A CN105522003A CN201410517277.1A CN201410517277A CN105522003A CN 105522003 A CN105522003 A CN 105522003A CN 201410517277 A CN201410517277 A CN 201410517277A CN 105522003 A CN105522003 A CN 105522003A
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Abstract
The invention provides a sectional cooling control method for low-cost hot-rolled strip steel. The method comprises steps as follows: (1) control parameters met in the production process are input into a hot-rolling computer control system; (2) the sum of the final rolling target temperature and 30 DEG C serves as a set target temperature, maximum threading speeds of the strip steel with various specifications of group intervals are calculated by the aid of a virtual calculation function of a model, and finally, a speed distribution table for the various specifications of group intervals is determined and solidified in a model file; (3) on the basis of speed configuration in the step (2), an automatic control function is adopted for cooling water F3-4, F4-5, F5-6 and F6-7 among racks, a finish rolling outlet temperature measurement instrument detects the actual final rolling temperature, feedback calculation is started, the flow of the cooling water among the four groups of racks is calculated and adjusted in real time, and the final rolling temperature is ensured to be kept in a limited fluctuation range with the target value serving as the axis. With the adoption of the sectional cooling control method, stable control on various parameters of a laminar flow sectional cooling technology is realized, and production and development requirements of the low-cost hot-rolled strip steel are met.
Description
technical field:
The present invention relates to a kind of low cost hot-strip sub-sectional cooling control method, belong to TEMPERATURE FOR HOT STRIP LAMINAR cooling technology field.
background technology:
The design concept of composite facilitates the birth of the hot-rolled product such as dual phase steel, Multiphase Steel, it is distributed with the martensite second-phase of hard in continuous print ferrite matrix, this kind of steel has high initial manufacture hardening rate, high ductility, low yield tensile ratio, the features such as high tensile strength and high baking hardenability, are just developing into the important component part of Hyundai Motor steel.Force the advantage cooled after Japanese Nippon Steel etc. utilizes hot rolling, develop low temperature and batch hot-rolled production process.This technique adopts controlled rolling at hot rolling stage, makes ferrite separate out from austenite in cooling procedure, then adopts cooling fast on the run-out table, be cooled to rapidly below Ms temperature to batch hot steel band, finally obtain F+M.Coiling temperature, generally lower than 300 DEG C, avoids the formation of bainite, avoids ferritic timeliness and martensitic self tempering simultaneously.Batch the production method of type hot-strip according to low temperature, in actual production, automatic Controlled cooling system can adopt sub-sectional cooling mode to control.Sub-sectional cooling refers to and cooling control zone is divided into leading portion and back segment two regions, roll rear band steel and enter the leading portion cooling of controlled cooling model region, reach certain cold medium temperature of layer, then air cooling a period of time, enter control cold-zone back segment again and carry out a kind of Controlling Technology of water-cooled to target coiling temperature, namely by the sub-sectional cooling mode of the intensive cooling of leading portion+intensive cooling of middle air cooling+back segment, control completed belt iron and steel ferritic and martensitic volume fraction, reach the performance requirement of phase transformation strengthening.
The process parameter control of sub-sectional cooling is complicated, better can realize in thermal modeling test.But in industrialized production, because band steel is dynamic production, the control difficulty of complicated technology parameter is comparatively large, if can realize the stability control techniques of these technological parameters, just can obtain the finished product Microstructure and properties of needs, meet production and the exploitation needs of different low cost band steel.
Summary of the invention
The object of the invention is to provide a kind of low cost hot-strip sub-sectional cooling control method for above-mentioned Problems existing, the method realizes the stability contorting of each parameter of laminar flow sub-sectional cooling technique, meets production and the exploitation needs of low cost hot-strip.
Above-mentioned object is achieved through the following technical solutions:
Low cost hot-strip sub-sectional cooling control method, the method comprises the steps:
(1) the controling parameters input hot rolling computer control system will met in production process;
(2) with finish to gauge target temperature+30 DEG C for setting target temperature, utilize model virtual computing function, calculate each set of specifications apart from the band steel maximum threading speed that can reach, finally determine the pace chart of each set of specifications distance, be solidificated in model file;
(3) on the basis of step (2) speed configuration, interstand cooling water F3-4, F4-5, F5-6, F6-7 come into operation automatic control function, finish rolling outlet temperature measurer detects actual finishing temperature, feedback calculates and starts, real-time calculating, adjust the flow of 4 groups of interstand cooling water, ensure that finishing temperature control is within the scope of the limited fluctuation taking desired value as axle.
Described low cost hot-strip sub-sectional cooling control method, described interstand cooling water F3-4, F4-5, F5-6, the F6-7 method automatically controlled that comes into operation is: F3-4 section cooling control method is: according to the difference of exit temperature at finishing and the cold intermediate objective temperature of layer, precomputation first paragraph cooling manifold opens quantity, after finish rolling first frame has steel signal enabling, collector number needed for opening in the other direction, after finish rolling outlet temperature measurer detects actual finishing temperature, cooling jig carries out feedforward and calculates, the unlatching quantity of real-time adjustment first paragraph cooling manifold, ensure that the cold medium temperature of layer controls within the scope of the limited fluctuation taking desired value as axle, according to the change of band steel actual speed, calculate, adjust F4-5 section cooling manifold enable possition, ensure the moderate soak time of segmented cooling.
Beneficial effect:
Utilize model virtual computing function, determine the maximum threading speed of each specification strip steel, be equipped with lower rate of acceleration increasing speed rolling, guarantee that whole operation of rolling velocity variations is steady; (2) utilize the function that interstand cooling water is regulated the speed soon, flow is large, can high temperature, soon roll band steel finishing temperature control within the scope of the limited fluctuation taking desired value as axle; (3) first paragraph section cooling adopts Reverse Turning Control, can ensure to be with the air cooling time of steel every bit all from last group collector of Bank3; (4) second segment cools existing feedforward control, has FEEDBACK CONTROL again, is equivalent to a closed-loop control of traditional process for cooling.Can accurately the intensive cooling hot-rolled band steel of key-course flow point segmentation finishing temperature, intermediate objective temperature, moderate soak time, batch inlet temperature etc., realize " with water cash equivalent " hot-rolled product technological development, for the exploitation of economical high-strength steel and technique realize providing technical scheme.
Accompanying drawing explanation
Accompanying drawing 1 is that different size group is apart from strip speed allocation of parameters table.
Accompanying drawing 2 is the speed schematic diagram of quick threading, nearly at the uniform velocity rolling.
Accompanying drawing 3 is the speed schematic diagram of pair rolling.
Accompanying drawing 4 is interstand cooling discharge control schematic diagram.
Accompanying drawing 5 is that schematic diagram arranged by laminar flow section dense cooling manifold and temperature measurer.
Accompanying drawing 6 is that laterally brute force purges water-bound schematic diagram.
Accompanying drawing 7 is control flow chart of the present invention.
Detailed description of the invention
The present invention is to provide a kind of hot rolling low cost band steel layer stream cooling technology, by Appropriate application finish rolling model and equipment control device, section cooling model and equipment control device, accurately can control finishing temperature, intermediate objective temperature, the moderate soak time of laminar flow two-stage cooling hot rolling low cost band steel, batch inlet temperature etc.Specifically comprise the following steps:
Step 1, production management system issue certain finished strip specification, finishing temperature, the cold medium temperature of layer, moderate soak time, the information such as inlet temperature, section cooling code of batching to hot rolling computer control system;
Step 2, finish rolling model search the speed control parameter configured in the speed configuration table 1 of this tapping mark, carry out threading, rolling by this parameter, and Fig. 2 (Fig. 3 is shown in by pair rolling speeds control schematic diagram) is shown in by speeds control schematic diagram;
Step 3, fly into back-end crop signal arrive, interstand cooling water F3-4, F4-5, F5-6, F6-7 open automatically by setting value, finish rolling outlet temperature measurer detects finishing temperature actual value, feedback calculates and starts, the flow (Fig. 4 is shown in the flow signal of a certain interstand cooling water) of real-time adjustment 4 groups of interstand cooling water, ensures that finishing temperature control is within the scope of the limited fluctuation taking desired value as axle;
Step 4, for ensureing layer cold medium temperature, according to the difference of exit temperature at finishing and the cold intermediate objective temperature of layer, precomputation first paragraph cooling manifold opens quantity, after finish rolling first frame has steel signal enabling, and the collector number needed for opening from last group collector of Bank3 toward finish rolling direction.After finish rolling outlet temperature measurer detects actual finishing temperature, cooling jig carries out feedforward and calculates, the unlatching quantity of real-time adjustment first paragraph cooling manifold, makes the cold medium temperature of layer control within the scope of the limited fluctuation taking desired value as axle (laminar flow section dense cooling manifold and temperature measurer arrange that Fig. 5 is shown in by schematic diagram);
Step 5, due to first paragraph cooling water Bank3 last group collector cut-off, air cooling time with steel every bit in the operation of rolling is from timing through last group collector of Bank3, according to the change of band steel actual speed, calculate, adjust second segment cooling manifold enable possition, ensure the moderate soak time of segmented cooling;
When step 6, precomputation, with the cold medium temperature of layer with batch the unlatching group number that entrance target temperature difference, mill speed, heat transfer change etc. calculate the intensive cooling water of second segment.After finish rolling first frame has steel signal to arrive, the intensive cooling of second segment is from that group collector meeting air cooling time requirement, open toward coiling machine direction, after middle temperature measurer detects belt steel temperature, the intensive cooling feedforward control of second segment starts, in conjunction with the collector position meeting air cooling time requirement, adjustment second segment cooling manifold quantity, batch after entrance temperature measurer detects belt steel temperature, FEEDBACK CONTROL starts, and ensures that batching inlet temperature controls within the scope of the limited fluctuation taking desired value as axle;
Step 7, second segment intensive cooling FEEDBACK CONTROL aspect, only Bank14 is used as feedback regulation, Bank15 collector is set to fault valve, and wherein, Bank141-8 group cooling water is opened in advance when calculating second segment cooling total Water, when batching after entrance temperature measurer detects band steel actual temperature, FEEDBACK CONTROL starts, as belt steel temperature is higher, and the corresponding cooling manifold of increase Bank149-16, as belt steel temperature is on the low side, close the corresponding cooling manifold of Bank141-8;
Step 8,4 groups of laterally powerful blow device all unlatchings after finish rolling first frame has steel signal to reach, coiling machine afterbody is thrown steel signal and is reached rear closedown, wherein belt steel surface ponding after intensive for first paragraph cooling purges clean by the powerful blow device of transverse direction (Fig. 6 is shown in by schematic diagram) of Bank4, Bank5 collector tiltable frame entrance, Bank15 enters, belt steel surface ponding after intensive for second segment cooling purges clean by the powerful blow device of transverse direction of outlet, ensures the cold medium temperature of layer, batches inlet temperature measurement accurately.
embodiment 1
To produce the dual phase steel of certain trimmed size 4.0*1200mm.Concrete steps are as follows:
Step 1, production management system issue the cold medium temperature of finished strip technological parameter finishing temperature 820 DEG C, layer 720 DEG C, air cooling time 5s, the information such as inlet temperature 200 DEG C, laminar flow sub-sectional cooling code 21 of batching to hot rolling computer control system;
The speed configuration parameter of this tapping mark of step 2, finish rolling pattern query, thickness specification is: threading speed 6.4m/s, and finish rolling 1 adds, 2 accelerations are respectively 0.001,0.002m/s
2, carry out threading, rolling by this speed parameter, throw the maximum mill speed 6.6m/s of steel to afterbody, total length velocity variations 0.2m/s;
Step 3, fly into back-end crop signal and arrive, interstand cooling water F3-4, F4-5, F5-6, F6-7 are by setting value 140m
3/ hour, 160m
3/ hour, 180m
3/ hour, 100m
3/ hour unlatching, after finish rolling outlet temperature measurer detects finishing temperature head actual value 831 DEG C, feedback calculates and starts, the flow of real-time adjustment 4 groups of interstand cooling water, F3-4, F4-5, F5-6, F6-7 changes in flow rate scope 140-200m
3/ hour, 160-220m
3/ hour, 50-180m
3/ hour, 40-100m
3/ hour, actual finishing temperature control is at 818-835 DEG C;
The difference 105 DEG C of the cold intermediate objective temperature of step 4, precomputation exit temperature at finishing and layer, the intensive cooling manifold of first paragraph opens quantity 22 groups, after finish rolling first frame has steel signal enabling, open 22 groups of cooling waters from last group collector of Bank3 toward finish rolling direction.After finish rolling outlet temperature measurer detects actual finishing temperature 831 DEG C, feedforward control starts, in real time the unlatching quantity 20-24 group of adjustment first paragraph cooling manifold, the cold medium temperature 705-720 DEG C of actual layer;
Step 5, first paragraph cooling water are in last group collector cut-off of Bank3, air cooling time with steel every bit in the operation of rolling is from timing through last group collector of Bank3, according to the change of band steel actual speed, calculate, adjust second segment cooling manifold enable possition from Bank9 the 1st group to the 5th group, ensure that the sub-sectional cooling moderate soak time is at 5.0-5.2s;
When step 6, precomputation, with the cold medium temperature of layer with batch the unlatching 96 groups that the parameters such as entrance target temperature difference, mill speed, heat transfer change calculate second segment cooling water.After finish rolling first frame has steel signal enabling, second segment cooling manifold, from Bank9 the 1st group of collector meeting air cooling time requirement, opens 96 groups toward coiling machine direction, and feedforward collector is opened to the 8th group of Bank11, and feedback collector opens the 1-8 group of Bank.After middle temperature measurer detects belt steel temperature, second segment cooling feedforward control starts, in conjunction with the initial collector position of air cooling time change, and the collector quantity 96-100 group of adjustment second segment cooling;
The intensive cooling FEEDBACK CONTROL of step 7, second segment, during precomputation, open when Bank141-8 group cooling water finish rolling first frame has steel signal to arrive, batch after entrance temperature measurer detects band steel actual temperature 210 DEG C, FEEDBACK CONTROL starts, establish Bank14 the 10th group newly by Bank141-8 group cooling manifold, finally batch inlet temperature and control at 180-210 DEG C;
Step 8,4 groups of laterally powerful blow device all unlatchings after finish rolling first frame has steel signal to reach, coiling machine afterbody is thrown steel signal and is reached rear closedown, wherein belt steel surface ponding after intensive for first paragraph cooling all purges totally by the powerful blow device of transverse direction of Bank4, Bank5 collector tiltable frame entrance, Bank15 enters, belt steel surface ponding after intensive for second segment cooling purges clean by the powerful blow device of transverse direction of outlet substantially, the cold medium temperature of layer and batch inlet temperature and measure accurately.
Claims (2)
1. a low cost hot-strip sub-sectional cooling control method, is characterized in that: the method comprises the steps:
(1) the controling parameters input hot rolling computer control system will met in production process;
(2) with finish to gauge target temperature+30 DEG C for setting target temperature, utilize model virtual computing function, calculate each set of specifications apart from the band steel maximum threading speed that can reach, finally determine the pace chart of each set of specifications distance, be solidificated in model file;
(3) on the basis of step (2) speed configuration, interstand cooling water F3-4, F4-5, F5-6, F6-7 come into operation automatic control function, finish rolling outlet temperature measurer detects actual finishing temperature, feedback calculates and starts, real-time calculating, adjust the flow of 4 groups of interstand cooling water, ensure that finishing temperature control is within the scope of the limited fluctuation taking desired value as axle.
2. low cost hot-strip sub-sectional cooling control method according to claim 1, it is characterized in that: described interstand cooling water F3-4, F4-5, F5-6, the F6-7 method automatically controlled that comes into operation is: F3-4 section cooling control method is: according to the difference of exit temperature at finishing and the cold intermediate objective temperature of layer, precomputation first paragraph cooling manifold opens quantity, after finish rolling first frame has steel signal enabling, collector number needed for opening in the other direction, after finish rolling outlet temperature measurer detects actual finishing temperature, cooling jig carries out feedforward and calculates, the unlatching quantity of real-time adjustment first paragraph cooling manifold, ensure that the cold medium temperature of layer controls within the scope of the limited fluctuation taking desired value as axle, according to the change of band steel actual speed, calculate, adjust F4-5 section cooling manifold enable possition, ensure the moderate soak time of segmented cooling.
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| CN106370507A (en) * | 2016-08-17 | 2017-02-01 | 武汉钢铁股份有限公司 | Strip steel experiment method and device |
| CN109174977A (en) * | 2017-06-30 | 2019-01-11 | 宝山钢铁股份有限公司 | Hot-rolling laminar low temperature belt steel surface high-precision purging feedback |
| CN110064667A (en) * | 2019-04-12 | 2019-07-30 | 首钢京唐钢铁联合有限责任公司 | Laminar cooling method for steel plate |
| CN111093850A (en) * | 2017-09-19 | 2020-05-01 | 日本制铁株式会社 | Cooling device and cooling method for steel material |
| CN111195655A (en) * | 2018-11-20 | 2020-05-26 | 宝山钢铁股份有限公司 | Control method for high-carbon steel head impact marks |
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| CN111822527A (en) * | 2020-08-26 | 2020-10-27 | 武汉钢铁有限公司 | Experimental device and method for simulating cooling process after hot rolling |
| CN112122361A (en) * | 2019-06-25 | 2020-12-25 | 上海梅山钢铁股份有限公司 | Laminar cooling control method for preventing medium-high carbon steel from cracking |
| CN112122360A (en) * | 2019-06-24 | 2020-12-25 | 上海梅山钢铁股份有限公司 | Laminar cooling control method for thin hot continuous rolling strip steel |
| TWI731809B (en) * | 2020-10-21 | 2021-06-21 | 中國鋼鐵股份有限公司 | Control method for improving coiling temperature vibration on steel bar |
| CN113441556A (en) * | 2020-03-25 | 2021-09-28 | 上海梅山钢铁股份有限公司 | Laminar cooling process control method of low-temperature coiled hot-rolled dual-phase steel |
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| CN109174977B (en) * | 2017-06-30 | 2020-03-06 | 宝山钢铁股份有限公司 | High-precision purging feedback control method for surface of hot-rolled laminar low-temperature strip steel |
| CN111093850A (en) * | 2017-09-19 | 2020-05-01 | 日本制铁株式会社 | Cooling device and cooling method for steel material |
| CN111195655A (en) * | 2018-11-20 | 2020-05-26 | 宝山钢铁股份有限公司 | Control method for high-carbon steel head impact marks |
| CN110064667A (en) * | 2019-04-12 | 2019-07-30 | 首钢京唐钢铁联合有限责任公司 | Laminar cooling method for steel plate |
| CN110064667B (en) * | 2019-04-12 | 2021-03-23 | 首钢京唐钢铁联合有限责任公司 | Laminar cooling method for steel plate |
| CN112122360B (en) * | 2019-06-24 | 2022-07-12 | 上海梅山钢铁股份有限公司 | Laminar cooling control method for thin hot continuous rolling strip steel |
| CN112122360A (en) * | 2019-06-24 | 2020-12-25 | 上海梅山钢铁股份有限公司 | Laminar cooling control method for thin hot continuous rolling strip steel |
| CN112122361A (en) * | 2019-06-25 | 2020-12-25 | 上海梅山钢铁股份有限公司 | Laminar cooling control method for preventing medium-high carbon steel from cracking |
| CN111482466A (en) * | 2020-03-20 | 2020-08-04 | 唐山钢铁集团有限责任公司 | Method for setting acceleration of rolling mill |
| CN111482466B (en) * | 2020-03-20 | 2021-10-12 | 唐山钢铁集团有限责任公司 | Method for setting acceleration of rolling mill |
| CN113441556B (en) * | 2020-03-25 | 2022-09-09 | 上海梅山钢铁股份有限公司 | Laminar cooling process control method of low-temperature coiled hot-rolled dual-phase steel |
| CN113441556A (en) * | 2020-03-25 | 2021-09-28 | 上海梅山钢铁股份有限公司 | Laminar cooling process control method of low-temperature coiled hot-rolled dual-phase steel |
| CN111822527A (en) * | 2020-08-26 | 2020-10-27 | 武汉钢铁有限公司 | Experimental device and method for simulating cooling process after hot rolling |
| TWI731809B (en) * | 2020-10-21 | 2021-06-21 | 中國鋼鐵股份有限公司 | Control method for improving coiling temperature vibration on steel bar |
| CN113680833A (en) * | 2021-08-06 | 2021-11-23 | 唐山钢铁集团有限责任公司 | Layer cooling control method for realizing two-stage cooling by utilizing conventional cooling |
| CN114453436A (en) * | 2022-01-06 | 2022-05-10 | 首钢京唐钢铁联合有限责任公司 | Control method and device for strip steel finish rolling equipment and computer equipment |
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