CN105268748A - Hot rolling load distribution method based on product classification - Google Patents
Hot rolling load distribution method based on product classification Download PDFInfo
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- CN105268748A CN105268748A CN201410338147.1A CN201410338147A CN105268748A CN 105268748 A CN105268748 A CN 105268748A CN 201410338147 A CN201410338147 A CN 201410338147A CN 105268748 A CN105268748 A CN 105268748A
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Abstract
The invention provides a hot rolling load distribution method based on product classification. The hot rolling load distribution method comprises the following steps that incoming hot-rolled slabs are divided into cold-rolled materials and specific steel, a reduction ratio load distribution way is adopted for the cold-rolled materials, and a rolling force load distribution way is adopted for the specific steel; and a function of automatic switching between the two load distribution modes is added in a control system. According to the hot rolling load distribution method, the rolling force and reduction ratio combined type load distribution way is adopted by a finish rolling unit according to the purposes of products based on the characteristics of the hot-rolled products, in this way, on the premise that stable production is guaranteed, the frequency and amplitude of intervention in the load of a rolling mill by an operator are reduced, and the probability that waste steel is generated due to slipping of a machine frame in the preceding stage of finish rolling is reduced.
Description
technical field:
The present invention relates to a kind of productized hot rolling load distribution method.
background technology:
Introduce from the U.S. GE when existing hot rolling 1422mm model is finish rolling technological transformation in 2002, former GE finish rolling model only adopts roll-force laod sharing mode, although there is reduction ratio laod sharing mode in program, but the product of debugging is relatively less due to the initial stage, all products all adopt roll-force mode to produce, just do not have debugged to the reduction ratio method of salary distribution, in program, there is a lot of BUG.Along with cold mill complex is reached the standard grade, the cold-rolled products of rolling get more and more, when cold rolling material is when adopting roll-force mode of manufacture, larger change can be there is in the relative reduction ratio of each frame along with the change of field condition (as roll diameter of roller, entry temperature at finishing, pressure-measuring head accuracy of detection etc.), operative employee needs often to intervene load as required, thus the amplitude causing the instability of producing and operating personnel to intervene each frame sharing of load and frequency increase, frame time serious, can be caused to sting steel skidding and steel scrap.
Summary of the invention
The object of the invention is to provide a kind of productized hot rolling load distribution method for above-mentioned Problems existing, for the feature of hot-rolled product, according to the laod sharing mode that the purposes of product adopts roll-force and reduction ratio to combine in mm finishing mill unit, under the prerequisite guaranteeing administration measure, reduce operative employee to the intervention frequency of mill load and amplitude, reduce the phenomenon of finish rolling leading portion frame skidding steel scrap.
Above-mentioned object is achieved through the following technical solutions:
Productized hot rolling load distribution method, the method comprises the steps: incoming hot rolled slab to be divided into cold rolling material and the large class of variety steel two, and cold rolling material adopts reduction ratio laod sharing mode, and variety steel adopts roll-force laod sharing mode; Increase by two kinds of load distribution mode automatic switching functions in the controls.
Described productized hot rolling load distribution method, described reduction ratio laod sharing mode comprises the steps:
(1) sharing of load initial setting: the initial load that the load design specification corresponding according to product specification each in model database and the intervention of operative employee on load picture measure out each frame model specification distributes
distribute with total load
, wherein i to be 1 ~ N, N be frame sum, and the intervention scope of first frame and last frame to be placed on ± 150% between, other frames are between ± 120%;
(2) sharing of load standardization: distribute with initial load
maximum be benchmark, carry out standardization to the sharing of load of each frame, computing formula is as follows:
(formula 1),
(formula 2);
(3) the setting initial calculation of each frame drafts: when first time carries out THICKNESS CALCULATION, adopt the result of step 2 and roughing target thickness, finish rolling target thickness to calculate the drafts of each frame of finish rolling, suppose that current finish rolling has n frame, i is shelf number,
(formula 3),
In formula:
for each frame load of model initial setting,
for roughing target thickness,
for finish rolling target thickness,
it is the i-th rack outlet belt steel thickness;
(4) alternative manner is adopted to recalculate each frame load, until meet technological requirement: the limit range arranging reduction ratio according to the technological design of field working conditions and product in a model, and draw drafts scope and limited frame thus, if the reduction ratio of limited frame exceeds allowed band, so calculate according to formula 4 ratio that each frame exceeds, and calculate new sharing of load, and adjust this frame and other frame loads respectively according to formula 5 and formula 6
(formula 4),
(formula 5),
(formula 6),
In formula:
for the sharing of load coefficient of frame time limited,
for frame needs the sharing of load of adjustment,
for non-NULL crosses frame number,
According to the load after adjustment
replace
, according to step 2 and the step 3 each passage load of iterative computation and drafts again, until institute's organic frame correlation model setting all meets production requirement;
(5) self study of the reduction ratio method of salary distribution: when the load proportion before load adjustment amount with adjustment is within 10%, by model parameter stored in database, calculate for next model specification,
(formula 7),
In formula:
for configuring the load coefficient of each frame in model database,
for after load adjustment with the difference of adjustment preload coefficient,
for self study coefficient, in model, be set to 0.1.
Described productized hot rolling load distribution method, described cold rolling material comprises straight carbon steel SPHC series, tin plate is serial, IF steel serial and acid-cleaning plate, and described variety steel comprises cylinder steel, boxboard, pipe line steel.
Accompanying drawing explanation
Fig. 1: program flow diagram of the present invention.
Detailed description of the invention
Productized hot rolling load distribution method, the method comprises the steps:
One, determine which kind of laod sharing mode product adopts:
The product that current hot rolling 1422mm produces line is divided into cold rolling material and the large class of variety steel two.Cold rolling material comprises straight carbon steel SPHC series, tin plate is serial, IF steel serial and acid-cleaning plate, and variety steel comprises cylinder steel, boxboard, pipe line steel etc.Because the tensile strength of cold rolling material is generally relatively low, basic at below 400MP, ductility is good, can produce further at cold rolling process, cold rollingly require that the thick difference of incoming hot rolled slab is as far as possible little, so adopt reduction ratio laod sharing mode according to rolling feature at hot fine rolling; Variety steel tensile strength is higher, generally at more than 400MP, has the performances such as high rigidity, high-wearing feature and high tenacity, substantially takes out as finished product after hot rolling, requires it is not too high to thick difference, so adopt roll-force laod sharing mode.
Two, roll-force and reduction ratio two kinds of load distribution mode automatic switching function exploitations:
Increase in model steel grade table and whether adopt reduction ratio mode identification field, 0 representative adopts roll-force mode, and 1 representative adopts reduction ratio mode.
Three, the Controlling model of reduction ratio rolling mode is developed and is optimized:
Although there is reduction ratio laod sharing mode in hot rolling 1422mm model program, due to the initial stage, the product of debugging is relatively less, and all products all adopt roll-force mode to produce, and just do not have debugged to the reduction ratio method of salary distribution, there is a lot of BUG in program.On original model basis, again develop the data structure relevant with optimizing rolling model under reduction ratio mode and control logic for this situation, particular content is as follows:
Step 1: sharing of load initial setting:
Sharing of load coefficient produces one of the production stability of line and the influence factor of control of product precision, therefore when configuring the sharing of load coefficient of the reduction ratio method of salary distribution of each product specification, need to use for reference a large amount of historical datas, the basis of historical data is carried out the rolling schedule model measuring and calculating of the reduction ratio method of salary distribution, and according to each frame roll-force of measuring and calculating, the relatively situation such as reduction ratio and power of motor, optimize other sharing of load coefficient of each layer, finally by suitable sharing of load coefficient stored in model database.
The initial load that the load design specification corresponding according to product specification each in model database and the intervention of operative employee on load picture measure out each frame model specification distributes
(i is 1 ~ N, N is frame sum) and total load distribute
, and the intervention scope of first frame and last frame to be placed on ± 150% between, other frames are between ± 120%.
Step 2: sharing of load standardization:
Distribute with initial load
maximum be benchmark, carry out standardization to the sharing of load of each frame, computing formula is as follows:
(formula 1),
(formula 2),
Step 3: the setting initial calculation of each frame drafts:
When first time carries out THICKNESS CALCULATION, adopt the result of step 2 and roughing target thickness, finish rolling target thickness to calculate the drafts of each frame of finish rolling, suppose that current finish rolling has n frame, i is shelf number.
(formula 3),
In formula:
for each frame load of model initial setting,
for roughing target thickness,
for finish rolling target thickness,
be the i-th rack outlet belt steel thickness,
Step 4: adopt alternative manner to recalculate each frame load, until meet technological requirement.
The limit range of reduction ratio is set in a model according to the technological design of field working conditions and product, and draw drafts scope and limited frame thus, if the reduction ratio of limited frame exceeds allowed band, so calculate according to formula 4 ratio that each frame exceeds, and calculate new sharing of load, and adjust this frame and other frame loads respectively according to formula 5 and formula 6.
(formula 4),
(formula 5),
(formula 6),
In formula:
for the sharing of load coefficient of frame time limited,
for frame needs the sharing of load of adjustment,
for non-NULL crosses frame number,
According to the load after adjustment
replace
, according to step 2 and the step 3 each passage load of iterative computation and drafts again, until institute's organic frame correlation model setting all meets production requirement.
Step 5: the self study of the reduction ratio method of salary distribution:
The load coefficient configured in a database
used for reference a large amount of historical datas to carry out calculating, substantially can meet current hot rolling to produce, in order to promote hot-rolled product quality further, need to improve constantly model specification precision by self-learning method, self study condition in this method is: when the load proportion before load adjustment amount with adjustment is within 10%, by model parameter stored in database, calculate for next model specification.
(formula 7)
In formula:
for configuring the load coefficient of each frame in model database,
for after load adjustment with the difference of adjustment preload coefficient,
for self study coefficient, in model, be set to 0.1.
Embody rule example:
Produce for plum steel hot rolling 1422mm, also can be applicable to the milling train that other are of the same type.
Table 1 plum steel hot rolling 1422mm steel grade grade classification table:
Table 2 plum steel hot rolling 1422mm width grade classification table:
Table 3 plum steel hot rolling 1422mm level of thickness divides table:
Table 4 plum steel hot rolling 1422mm roll-force sharing of load coefficient (for steel grade race 9(cylinder steel)):
For trade mark SPHC, the simple finishing stand setup calculation process describing employing reduction ratio laod sharing mode.Specification: exit thickness is 2.75mm, width is that 1010mm is illustrated, and calculation procedure is as follows:
The first step, according to band steel steel grade trade mark SPHC, question blank 1, trying to achieve steel grade grade is 3;
Second step, according to the exit width 1010mm of band steel, question blank 2, trying to achieve width grade is 1;
3rd step, according to the exit thickness 2.75mm of band steel, question blank 3, trying to achieve level of thickness is 6;
4th step, according to trying to achieve width grade, level of thickness above, by question blank 4, learns that this specification reduction ratio sharing of load coefficient of finish rolling F0-F6 frame when rolling is respectively 1.0,0.55,0.31,0.16,0.08,0.05,0.02;
5th step, realizes finishing stand setup according to the result of step 4 and calculates, finally calculate the exit thickness of each frame, speed, roll-force etc.
Equally, for trade mark HP295, the simple finishing stand setup calculation process describing employing roll-force laod sharing mode.Specification: exit thickness is 2.5mm, width is that 1250mm is illustrated, and calculation procedure is as follows:
The first step, according to band steel steel grade trade mark HP295, question blank 1, trying to achieve steel grade grade is 9;
Second step, according to the exit width 1250mm of band steel, question blank 2, trying to achieve width grade is 2;
3rd step, according to the exit thickness 2.5mm of band steel, question blank 3, trying to achieve level of thickness is 4;
4th step, according to trying to achieve width grade, level of thickness above, by question blank 4, learns that this specification reduction ratio sharing of load coefficient of finish rolling F0-F6 frame when rolling is respectively 1.0,0.74,0.69,0.60,0.55,0.46,0.36;
5th step, realizes finishing stand setup according to the result of step 4 and calculates, finally calculate the exit thickness of each frame, speed, roll-force etc.
Below be only most preferred embodiment of the present invention, method of the present invention includes but not limited to the technical scheme disclosed in above-described embodiment, and unaccomplished matter of the present invention belongs to the common practise of those skilled in the art.
Claims (3)
1. a productized hot rolling load distribution method, is characterized in that: the method comprises the steps: incoming hot rolled slab to be divided into cold rolling material and the large class of variety steel two, and cold rolling material adopts reduction ratio laod sharing mode, and variety steel adopts roll-force laod sharing mode; Increase by two kinds of load distribution mode automatic switching functions in the controls.
2. productized hot rolling load distribution method according to claim 1, is characterized in that: described reduction ratio laod sharing mode comprises the steps:
(1) sharing of load initial setting: the initial load that the load design specification corresponding according to product specification each in model database and the intervention of operative employee on load picture measure out each frame model specification distributes
distribute with total load
, wherein i to be 1 ~ N, N be frame sum, and the intervention scope of first frame and last frame to be placed on ± 150% between, other frames are between ± 120%;
(2) sharing of load standardization: distribute with initial load
maximum be benchmark, carry out standardization to the sharing of load of each frame, computing formula is as follows:
(formula 1),
(formula 2);
(3) the setting initial calculation of each frame drafts: when first time carries out THICKNESS CALCULATION, adopt the result of step 2 and roughing target thickness, finish rolling target thickness to calculate the drafts of each frame of finish rolling, suppose that current finish rolling has n frame, i is shelf number,
(formula 3),
In formula:
for each frame load of model initial setting,
for roughing target thickness,
for finish rolling target thickness,
it is the i-th rack outlet belt steel thickness;
(4) alternative manner is adopted to recalculate each frame load, until meet technological requirement: the limit range arranging reduction ratio according to the technological design of field working conditions and product in a model, and draw drafts scope and limited frame thus, if the reduction ratio of limited frame exceeds allowed band, so calculate according to formula 4 ratio that each frame exceeds, and calculate new sharing of load, and adjust this frame and other frame loads respectively according to formula 5 and formula 6
(formula 4),
(formula 5),
(formula 6),
In formula:
for the sharing of load coefficient of frame time limited,
for frame needs the sharing of load of adjustment,
for non-NULL crosses frame number,
According to the load after adjustment
replace
, according to step 2 and the step 3 each passage load of iterative computation and drafts again, until institute's organic frame correlation model setting all meets production requirement;
(5) self study of the reduction ratio method of salary distribution: when the load proportion before load adjustment amount with adjustment is within 10%, by model parameter stored in database, calculate for next model specification,
(formula 7),
In formula:
for configuring the load coefficient of each frame in model database,
for after load adjustment with the difference of adjustment preload coefficient,
for self study coefficient, in model, be set to 0.1.
3. productized hot rolling load distribution method according to claim 1 and 2, it is characterized in that: described cold rolling material comprises straight carbon steel SPHC series, tin plate is serial, IF steel serial and acid-cleaning plate, and described variety steel comprises cylinder steel, boxboard, pipe line steel.
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| CN106269911A (en) * | 2016-08-29 | 2017-01-04 | 首钢京唐钢铁联合有限责任公司 | A kind of roughing pressure Control System of Load Distribution method and roughing control system |
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| CN108856305A (en) * | 2018-06-14 | 2018-11-23 | 武汉钢铁有限公司 | A kind of non-orientation silicon steel production mill load distribution method |
| CN108971236A (en) * | 2017-05-31 | 2018-12-11 | 宝山钢铁股份有限公司 | A kind of draught pressure forecast method of hot continuous rolling composite strip |
| CN109848221A (en) * | 2018-12-21 | 2019-06-07 | 东北大学 | A kind of hot continuous rolling whole process load distribution method |
| CN110947771A (en) * | 2019-11-22 | 2020-04-03 | 东北大学 | Method for calculating rolling energy consumption of hot continuous rolling |
| CN111906152A (en) * | 2020-07-02 | 2020-11-10 | 九江萍钢钢铁有限公司 | Finish rolling stage load adjustment method for controlling shape of medium plate |
| CN113145650A (en) * | 2021-05-12 | 2021-07-23 | 南京钢铁股份有限公司 | Wide and thick plate rolling mill load distribution method based on actual rolling case retrieval |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106311762A (en) * | 2016-08-26 | 2017-01-11 | 首钢京唐钢铁联合有限责任公司 | Load distribution method improving rolling stability of hot-rolled thin strip |
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| CN106269911A (en) * | 2016-08-29 | 2017-01-04 | 首钢京唐钢铁联合有限责任公司 | A kind of roughing pressure Control System of Load Distribution method and roughing control system |
| CN106269911B (en) * | 2016-08-29 | 2018-10-23 | 首钢京唐钢铁联合有限责任公司 | A kind of roughing pressure Control System of Load Distribution method and roughing control system |
| CN108971236A (en) * | 2017-05-31 | 2018-12-11 | 宝山钢铁股份有限公司 | A kind of draught pressure forecast method of hot continuous rolling composite strip |
| CN108856305A (en) * | 2018-06-14 | 2018-11-23 | 武汉钢铁有限公司 | A kind of non-orientation silicon steel production mill load distribution method |
| CN109848221A (en) * | 2018-12-21 | 2019-06-07 | 东北大学 | A kind of hot continuous rolling whole process load distribution method |
| CN110947771A (en) * | 2019-11-22 | 2020-04-03 | 东北大学 | Method for calculating rolling energy consumption of hot continuous rolling |
| CN111906152A (en) * | 2020-07-02 | 2020-11-10 | 九江萍钢钢铁有限公司 | Finish rolling stage load adjustment method for controlling shape of medium plate |
| CN111906152B (en) * | 2020-07-02 | 2022-03-18 | 九江萍钢钢铁有限公司 | Finish rolling stage load adjustment method for controlling shape of medium plate |
| CN113145650A (en) * | 2021-05-12 | 2021-07-23 | 南京钢铁股份有限公司 | Wide and thick plate rolling mill load distribution method based on actual rolling case retrieval |
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