CN109277414B - Rolling control method for hot continuous rolling finishing mill group - Google Patents
Rolling control method for hot continuous rolling finishing mill group Download PDFInfo
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- CN109277414B CN109277414B CN201811248117.6A CN201811248117A CN109277414B CN 109277414 B CN109277414 B CN 109277414B CN 201811248117 A CN201811248117 A CN 201811248117A CN 109277414 B CN109277414 B CN 109277414B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/48—Tension control; Compression control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
Abstract
The invention provides a rolling control method for a hot continuous rolling finishing mill group, which comprises the following steps: determining the type of strip steel to be rolled; judging whether the steel type is a specific steel type, and if the steel type is the specific steel type, controlling the rolling of each rolling mill in the finishing mill group by adopting a segmented pressure coefficient for the head part, the middle part and the tail part of the strip steel; if not, the rolling of each rolling mill in the finishing train is controlled using the conventional pressure coefficients for the head, middle and tail of the strip.
Description
Technical Field
The invention relates to the field of automatic finish rolling control of a hot continuous rolling strip steel rolling line, in particular to a control method for rolling of a hot continuous rolling finishing mill group.
Background
At present, in large hot rolling enterprises, the rolling varieties are multiple, and the strength difference of strip steel is large. The rolling load difference of the strip steel caused by the head of the strip steel of certain specific steel grades is up to more than 15%, and equipment such as a mill housing gap of a finishing mill group and the like can change when being operated at high temperature for a long time. These all can cause rolling pressure fluctuation of the stand in the process of tension establishment at the head part of the strip steel or tension loss at the tail part of the strip steel, and further cause abnormal action of the loop. This not only easily causes steel scrap, affects the quality of the rolled products, but also damages hydraulic pipelines and mechanical equipment, with very serious consequences. For equipment already built in hot rolling enterprises, it is not practical to solve the problem from the equipment.
Aiming at the defects of the prior art, a rolling control method capable of solving the problem of abnormal action of the loop caused by rolling pressure fluctuation is urgently needed.
Disclosure of Invention
The invention aims to provide a rolling control method for a hot continuous rolling finishing mill group aiming at the defects of the prior art, and the rolling control method is used for solving the problem of abnormal action of a loop caused by rolling pressure fluctuation in the prior art.
The invention provides a rolling control method for a hot continuous rolling finishing mill group, which comprises the following steps:
determining the type of strip steel to be rolled;
judging whether the steel type is a specific steel type, and if the steel type is the specific steel type, controlling the rolling of each rolling mill in the finishing mill group by adopting a segmented pressure coefficient for the head part, the middle part and the tail part of the strip steel; if not, the rolling of each rolling mill in the finishing train is controlled using the conventional pressure coefficients for the head, middle and tail of the strip.
The rolling control method for the hot continuous rolling finishing mill unit provided by the invention avoids the abnormal action of the loop caused by rolling pressure fluctuation, reduces the rolling faults and equipment faults in the finishing rolling process and reduces the equipment investment.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
Fig. 1 shows a schematic flow diagram of a rolling control method for a hot continuous rolling finishing train according to an embodiment of the invention; and
FIG. 2 shows a block diagram of a computer system, according to an embodiment of the invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
Fig. 1 shows a schematic flow diagram of a rolling control method for a hot continuous rolling finishing train according to an embodiment of the invention, as shown in fig. 1, comprising the steps of:
and step S110, determining the type of the strip steel to be rolled.
The rolling Control method for the hot continuous rolling finishing mill unit is realized based on Automatic thickness Control (AGC).
Specifically, the secondary computer determines the type and specification of the strip steel to be rolled according to the rolling schedule and the set model, and transmits the determined type and specification of the strip steel to be rolled to the primary computer, as shown in fig. 2.
Step S120, judging whether the steel type is a specific steel type, if so, executing step S121, and controlling the rolling of each rolling mill in the finishing mill group by adopting sectional pressure coefficients for the head part, the middle part and the tail part of the strip steel; if it is not the specific steel grade, the step S122 is performed to control the rolling of each rolling mill in the finishing train using the conventional pressure coefficients for the head, middle and tail of the strip. The logic switching of the sectional control is realized according to the on and off of the load relay of each rolling mill and a flying shear tail cutting completion signal.
And the primary computer determines whether the steel type of the strip steel to be rolled is a specific steel type according to the received steel type of the strip steel to be rolled issued by the secondary computer. Wherein, the specific steel mainly comprises nickel stainless steel, high-strength steel and the like. The nickel stainless steel is generally specified to have a thickness of not more than 3.0mm and a width of not less than 1200mm, and the high-strength steel is generally specified to have a thickness of not more than 2.0mm and a width of not less than 1100 mm.
If the steel grade of the strip to be rolled is not a specific steel grade, the rolling of each rolling mill in the finishing mill group is controlled using a conventional pressure coefficient for the head, middle and tail of the strip, which maintains the AGC conventional pressure coefficient (i.e., K described below)1Is set to 1). The head of the strip steel is 1-2 m of the length of the strip steel after the frame bites the steel, the tail of the strip steel is the length from the tail of the strip steel to the corresponding frame after the tail of the strip steel is cut, and the middle part of the strip steel is the part of the strip steel except the head and the tail of the strip steel.
If the steel type of the strip steel to be rolled is a specific steel type, the sectional pressure coefficients are adopted for the head part, the middle part and the tail part of the strip steel to control the rolling of each rolling mill in the finishing mill group. For the rolling of the head, the middle and the tail of the strip steel, in order to control each rolling mill in the finishing mill group in a segmented manner, pressure coefficients of the bounce for each rolling mill are required to be set for the head, the middle and the tail of the strip steel in a segmented manner, wherein the calculation formula of the bounce is as follows:
S＝(P×K×K1/KG)-S0
wherein S is0The calculated unit is millimeter, and the calculated unit is the spring amount corresponding to the zero setting rolling force;
KGis the equivalent of stiffness coefficient, and the calculation unit is kilonewton/millimeter;
k is a preset AGC conventional pressure coefficient;
K1is a segmental pressure coefficient, K is more than or equal to 01≤1；
P is actual rolling pressure, and the calculation unit of the pressure is kilonewton;
and S is the bounce amount, and the calculation unit of the bounce amount is millimeter.
In the embodiment of the invention, the head of the strip steel of the specific steel grade (hereinafter referred to as the specific strip steel) adopts the head pressure coefficient K set according to the rolling pressure deviation value delta P of the specific steel grade1Method of values, where Δ P is the absolute value of the rolling pressure deviation: setting the rolling pressure-actual rolling pressure | and the unit of the rolling pressure is ton; setting the sectional pressure coefficient K of the tail part of the specific strip steel according to the steel type specification of the specific strip steel1(ii) a The segment pressure coefficient of the middle part of the specific strip steel keeps the AGC conventional pressure coefficient, namely, the segment pressure coefficient K1Is set to 1.
In the embodiment of the invention, the sectional pressure coefficient K is used for the head part, the middle part and the tail part of the strip steel of a specific steel grade1Time, segment pressure coefficient K1The value-taking principle is as follows: the greater the rolling pressure deviation DeltaP for the strip head of each rolling mill, the greater the segment pressure coefficient K for the head of the strip of that particular steel grade1The smaller; for the tail of the strip of each rolling mill, the smaller the thickness and the larger the width of the strip of the specific steel grade, the smaller the sectional pressure coefficient for the tail of the strip of the preceding rolling mill in the rolling sequence in the finishing mill group and the larger the sectional pressure coefficient for the tail of the strip of the following rolling mill in the rolling sequence.
In order to more clearly express the rolling control method for the hot continuous rolling finishing mill group according to the embodiment of the present invention, examples one and two are shown below. In the example we assume the head section pressure coefficient K of a strip of a particular steel grade1The values of (A) can be shown in Table 1, and the tail section pressure coefficient K of the strip steel of a specific steel type based on the specification of the steel type1The values of (d) can be as shown in table 2.
TABLE 1
| Number of rack | K at a value of < 300 tons for delta P1 | K when delta P is more than 300 and less than or equal to 500 tons1 | K at a Δ P > 500 tons1 |
| F1-F2 | 1 | 1 | 0.2～0.4 |
| F3 | 1 | 0.2～0.3 | 0.1～0.2 |
| F4-F6 | 1 | 0.1～0.2 | 0.1～0.2 |
TABLE 2
| Number of rack | K1 |
| F1-F2 | 0.4～0.6 |
| F3-F4 | 0.6～0.85 |
| F5-F6 | 0.9～1 |
Example 1
The steel strips of the steel type to be rolled were nickel stainless steel strips having a thickness of 3.0mm and a width of 1250mm, and the set rolling pressures of the strip headers of the F1, F2, F3, F4, F5 and F6 stands, the actual rolling pressures of the strip headers, and the rolling pressure deviation values of the strip headers were as shown in table 3.
TABLE 3
Combining the value principle of the sectional pressure coefficient, the rolling pressure deviation value of the strip steel head in the table 3 and the head sectional pressure coefficient K of the strip steel of the specific steel grade in the table 11The value of (A) can be known as the pressure coefficient K of the head section of the F1 rack1Can be set to 1, F3 head segment pressure coefficient K of the frame1Is set to 0.3, F2, F4,Head segment pressure coefficient K of F5 and F4 frames1Can be set to 1; since the nickel stainless steel is a specific steel grade specification required in the embodiment of the present invention, the tail section pressure coefficient K of the strip steel of the specific steel grade based on the steel grade specification in table 2 can be used1By combining the above-mentioned principle of taking the pressure coefficient of the segment and according to table 2, the pressure coefficient K of the tail segment of the F1-F2 frame1Can be set to 0.6, F3-F4 frame tail section pressure coefficient K1Can be set to 0.8, F5-F6 frame tail section pressure coefficient K1Can be set to 1; for the middle part of the strip steel, the sectional pressure coefficient K is1May be set to 1.
After the sectional pressure coefficients of the head, the middle and the tail of the nickel stainless steel strip steel are determined according to the value-taking principle of the embodiment of the invention, the determined sectional pressure coefficients are used for controlling the rolling of each rack, thereby effectively avoiding the instability of the head and the tail of the strip steel caused by rolling pressure fluctuation when the strip steel of the specific steel type is rolled.
Example two
The steel grade to be rolled was automotive steel (high strength steel), the strip size was 2.0mm in thickness and 1100mm in width, and the set rolling pressure of the strip head of the stands F1, F2, F3, F4, F5, and F6, the actual rolling pressure of the strip head, and the rolling pressure deviation value of the strip head were as shown in table 4.
TABLE 4
Combining the value principle of the sectional pressure coefficient, the rolling pressure deviation value and the head sectional pressure coefficient K of the strip steel of the specific steel grade shown in the table 11The value of (A) can be known as the pressure coefficient K of the head section of the F1 rack1Can be set to 0.4, head segment pressure coefficient K of other frames1Can be set to 1; due to the automobile TQ550MCD is the specification of the specific steel grade required by the embodiment of the invention, so that the tail section pressure coefficient K of the strip steel of the specific steel grade based on the specification of the steel grade in Table 2 can be used1By combining the above-mentioned principle of taking values of the sectional pressure coefficients and according to table 2, the pressure coefficient K of the rear section of the F1-F2 frame1Can be set to 0.5, F3 pressure coefficient K of the tail section of the frame1Can be set to 0.6, the pressure coefficient of the tail section of the F4 frame is 0.85, and the pressure coefficient K of the tail section of the F5-F6 frame1Can be set to 0.9; for the middle part of the automobile TQ550MCD strip steel, AGC conventional pressure coefficient, namely segmented pressure coefficient K is adopted1May be set to 1.
After the sectional pressure coefficients of the head, the middle and the tail of the strip steel for the automobile are determined according to the value-taking principle of the embodiment of the invention, the determined sectional pressure coefficients are used for controlling the rolling of each rack, thereby effectively avoiding the instability caused by the rolling pressure fluctuation of the head and the tail of the strip steel when the strip steel of the specific steel type is rolled.
According to the rolling control method for the hot continuous rolling finishing mill group, the problem of abnormal fluctuation of rolling pressure in the finishing rolling process is solved, the normal action of a pressure system and a loop is ensured, the finishing rolling faults and equipment faults are reduced, and the equipment investment is effectively saved; meanwhile, the rolling control method for the hot continuous rolling finishing mill unit provided by the embodiment of the invention also reduces the production probability of the scrap steel, ensures the product thickness qualified rate and brings considerable economic benefits to hot rolling enterprises.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (6)
1. A rolling control method for a hot continuous rolling finishing mill group, comprising:
determining the type of strip steel to be rolled;
judging whether the strip steel type is a specific steel type, wherein the specific steel type comprises nickel stainless steel and high-strength steel, if the specific steel type is the specific steel type, controlling the rolling of each rolling mill in a finishing mill group by adopting a sectional pressure coefficient, wherein the smaller the strip steel thickness and the larger the width of the specific steel type are, the smaller the sectional pressure coefficient used for the tail part of the strip steel of a front-stage rolling mill in the rolling sequence in the finishing mill group is, and the larger the sectional pressure coefficient used for the tail part of the strip steel of a rear-stage rolling mill in the rolling sequence is, setting the sectional pressure coefficient used for the bounce amount of each rolling mill for the head part, the middle part and the tail part of the strip steel so as to control the rolling of the head part, the middle part and the tail part of the strip steel, wherein the calculation formula of the bounce amount is as follows:
S＝(P×K×K1/KG)-S0
wherein S is0The calculated unit of the spring amount corresponding to the zero setting rolling force is millimeter,
KGis the equivalent of the stiffness coefficient, and the calculation unit is kilonewton/millimeter,
k is a preset AGC normal pressure coefficient,
K1is a segmental pressure coefficient, K is more than or equal to 01≤1，
P is the actual rolling pressure, the calculation unit of which is kilonewton,
s is the bounce amount, and the calculation unit is millimeter; and
if not, the rolling of each rolling mill in the finishing train is controlled using the conventional pressure coefficients for the head, middle and tail of the strip.
2. The method according to claim 1, wherein a segment pressure coefficient for the strip head is set as a function of a rolling pressure deviation value Δ P,
setting rolling pressure-actual rolling pressure |;
setting a sectional pressure coefficient for the tail part of the strip steel according to the steel grade;
the segment pressure coefficient for the middle of the strip is set to 1.
3. The method according to claim 2, wherein the larger the rolling pressure deviation Δ Ρ, the smaller the segment pressure coefficient for the head of the strip.
4. A method according to any one of claims 1-3, wherein the steel grade is determined according to a rolling plan and a set model.
5. The method of claim 1, wherein the nickel stainless steel has a thickness of no more than 3.0mm and a width of no less than 1200mm, and the high strength steel has a thickness of no more than 2.0mm and a width of no less than 1100 mm.
6. The method according to any one of claims 1 to 3, wherein the head is a strip steel length of 1 m to 2 m after the frame bite; the tail part is the length from the tail part of the strip steel to the corresponding rack after the shearing is finished; the middle part is the part of the strip steel except the head part and the tail part.
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Citations (7)
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| US3610005A (en) * | 1969-05-27 | 1971-10-05 | Westinghouse Electric Corp | Roll positioning system calibration method and apparatus |
| JP2002346613A (en) * | 2001-05-28 | 2002-12-03 | Nippon Steel Corp | Composite roll for hot rolling and hot rolling method using the same |
| CN101036922A (en) * | 2007-04-17 | 2007-09-19 | 山西太钢不锈钢股份有限公司 | Control method of special hot rolled sheet to plus pressure |
| CN102172637A (en) * | 2010-12-17 | 2011-09-07 | 中冶南方工程技术有限公司 | High-accuracy automatic thickness control method and equipment based on thickness gauge subsection monitoring |
| CN103506405A (en) * | 2013-09-26 | 2014-01-15 | 山西太钢不锈钢股份有限公司 | Method for compensating finish rolling gap during mixed stainless steel rolling |
| JP2014014838A (en) * | 2012-07-09 | 2014-01-30 | Nippon Steel & Sumitomo Metal | Method and apparatus for producing hot-rolled steel sheet |
| CN104209344A (en) * | 2014-09-03 | 2014-12-17 | 山西太钢不锈钢股份有限公司 | Dynamic self-adapting press control method of hot continuous rolling special steel |
-
2018
- 2018-10-25 CN CN201811248117.6A patent/CN109277414B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3610005A (en) * | 1969-05-27 | 1971-10-05 | Westinghouse Electric Corp | Roll positioning system calibration method and apparatus |
| JP2002346613A (en) * | 2001-05-28 | 2002-12-03 | Nippon Steel Corp | Composite roll for hot rolling and hot rolling method using the same |
| CN101036922A (en) * | 2007-04-17 | 2007-09-19 | 山西太钢不锈钢股份有限公司 | Control method of special hot rolled sheet to plus pressure |
| CN102172637A (en) * | 2010-12-17 | 2011-09-07 | 中冶南方工程技术有限公司 | High-accuracy automatic thickness control method and equipment based on thickness gauge subsection monitoring |
| JP2014014838A (en) * | 2012-07-09 | 2014-01-30 | Nippon Steel & Sumitomo Metal | Method and apparatus for producing hot-rolled steel sheet |
| CN103506405A (en) * | 2013-09-26 | 2014-01-15 | 山西太钢不锈钢股份有限公司 | Method for compensating finish rolling gap during mixed stainless steel rolling |
| CN104209344A (en) * | 2014-09-03 | 2014-12-17 | 山西太钢不锈钢股份有限公司 | Dynamic self-adapting press control method of hot continuous rolling special steel |
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