CN116900051A - Steel turning mode and rolling system optimization setting method for rough rolling process of medium plate - Google Patents
Steel turning mode and rolling system optimization setting method for rough rolling process of medium plate Download PDFInfo
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Classifications
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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
- B21B1/38—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 sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
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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
- B21B37/58—Roll-force control; Roll-gap control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/20—Revolving, turning-over, or like manipulation of work, e.g. revolving in trio stands
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/20—Revolving, turning-over, or like manipulation of work, e.g. revolving in trio stands
- B21B39/32—Devices specially adapted for turning sheets
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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
- B21B1/38—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 sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
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Abstract
The invention discloses a method for optimally setting a steel turning mode and a rolling reduction degree in a rough rolling process of a medium plate, and belongs to the technical field of metallurgical technology and rolling. Aiming at the problem of reduced yield of rolled pieces caused by improper cogging and widening control in the production flow of the medium plate at present, the invention collects relevant parameters of steel plate blanks and finished products; (2) collecting relevant force energy parameters and other information of the roughing mill; (3) Cogging and steel conversion modes are selected according to the related parameters; and (4) optimizing the rolling reduction system of cogging and cross rolling. The invention establishes a complete determination method of the steel conversion mode and the rolling reduction system by taking good plate shape, improved yield and reduced rolling mill load change as targets and taking finished steel plate specification, allowable rolling force of a rolling mill, allowable power of the rolling mill, rolling reduction system and the like as constraints. The method can more effectively utilize equipment capacity, improve product quality, reduce production energy consumption, and is particularly beneficial to plate shape control in the following rough rolling and finish rolling stages.
Description
Technical Field
The invention belongs to the technical field of metallurgical technology and rolling, and particularly relates to a method for optimally setting a steel conversion mode and a rolling reduction system in a rough rolling process of a medium plate.
Background
The production process of the medium plate generally comprises rolling processes such as cogging rolling, widening rolling, rough rolling, finish rolling and the like. The cogging rolling refers to the first plastic working process of a billet, rolls the billet from a heating furnace into proper shape, size and tissue performance, reduces barrel shape during transverse rolling, lays a good foundation for improving the plate thickness precision and the stretching precision in the stretching stage, and can also eliminate the influence of uneven surface of the billet or end flattening caused by shearing. And (3) stretching rolling, namely, changing a blank from a longitudinal rolling state to a transverse rolling state through a steel conversion machine, and rolling the width until the width of the finished steel plate is obtained. The steel sheet is deformed in both the longitudinal and transverse directions, contributing to improvement of anisotropy of the steel sheet. The cogging and stretching links greatly affect the subsequent rough rolling and finish rolling processes, and if the proportion distribution of the longitudinal deformation and the transverse deformation is not proper, the problems of reduced yield of rolled pieces and the like can be caused.
Disclosure of Invention
Aiming at the problem that the yield of rolled pieces is reduced due to improper cogging and stretching control in the production flow of the medium plate at present, the invention provides an optimized setting method for a steel turning mode and a rolling system suitable for the rough rolling process of the medium plate. The method can better realize the cogging and stretching rolling process, is beneficial to reducing the power consumption, and better plays roles in controlling the rolling mill capacity and the follow-up plate shape, and the like.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a method for optimally setting a steel turning mode and a rolling system in a rough rolling process of a medium plate comprises the following steps:
step 1, collecting relevant parameters and rolling mill force energy parameters of a steel plate blank and the steel plate blank;
step 2, four steel conversion modes are set, and are respectively: a direct longitudinal rolling mode without turning steel, a direct transverse rolling mode without cogging, a transverse rolling mode after cogging one pass and a transverse rolling mode after cogging two passes;
step 3, cogging is carried out according to the related parameters of the step 1, and then a steel conversion mode is selected;
when the stretching ratio a 2 When the steel is less than or equal to 1.05, adopting a direct longitudinal rolling mode without rotating the steel;
when the width to thickness ratio a 1 When the rolling speed is more than 10, adopting a direct transverse rolling mode without cogging;
when the width to thickness ratio a 1 When the rolling speed is less than or equal to 7.5, adopting a transverse rolling mode after two cogging passes;
when the width to thickness ratio a 1 7.5 or more and 10 or less, the spread ratio a is considered 2 The method comprises the steps of carrying out a first treatment on the surface of the When the stretching ratio a 2 When the rolling speed is less than 1.4, adopting a direct transverse rolling mode without cogging; when the stretching ratio a 2 When the rolling speed is more than or equal to 1.4, adopting a transverse rolling mode after one-pass cogging;
step 4, optimizing the rolling reduction system of cogging and transverse rolling;
when the steel-turning mode is a direct longitudinal rolling mode without turning steel, directly entering a rough rolling stage;
when the steel conversion mode is a cogging direct transverse rolling mode, optimizing a transverse rolling process;
when the steel turning mode is a transverse rolling mode after one-pass cogging, the rolling force is 15%, and the transverse rolling process is optimized; when the stretching is relatively large, the length of the rolled piece before stretching needs to be increased to obtain good plate shape and plane shape. So that a relatively large reduction is adopted according to the capacity of the rolling mill;
when the steel conversion mode is a two-pass cogging after-transverse rolling mode, the first cogging reduction rate alpha 1 And a second cogging reduction rate alpha 2 And the sum is 30%, alpha 1 +α 2 ＝30％，α 2 ＜α 1 The method comprises the steps of carrying out a first treatment on the surface of the Optimizing the transverse rolling process;
the cross rolling process is optimized specifically as follows: in the transverse rolling process, the steel plate is rolled to the required width, and the steel plate is rolled to the required thickness according to the volume invariance theory, namely the thickness h 0 And h i The fixation is unchanged; determining the maximum rolling reduction and the transverse rolling pass of the rolling mill according to the rolling mill force energy parameters, the steel plate thickness and other data, and establishing a preliminary rolling reduction system; and optimizing the reduction rate of each pass by using a comprehensive equal-load optimization method, and improving the rolling precision and balancing the rolling force and rolling power.
Further, the relevant parameters of the steel plate blank in the step 1 include: thickness h of slab 0 Width w 0 Aspect ratio a 1 Length l 0 Poisson ratio po, density p, specific heat capacity c, thermal conductivity lamda, start rolling temperature t 0 。
Further, the relevant parameters of the steel plate finished product in the step 1 include: width w of finished product 1 End thickness h of transverse rolling i Ratio of spread a 2 。
Further, the rolling mill force energy parameters in the step 1 include: the diameter d of working rolls of a roughing mill and finishing mill set, the allowable rolling force f, the allowable rolling moment m, the power p of the rolling mill and the transmission speed v of a roller way.
Further, the cross rolling process optimization specifically comprises the following steps:
step a, load function f at the ith pass i (h i-1 -h i ) Introducing a load function of force and a load function of moment; and a weighting coefficient alpha, establishing a comprehensive load function;
wherein the load function of the force is expressed as: f (F) i ＝F i (h i-1 -h i ，w 0 ，l 0 Po, p, c, lamda, t); the load function of the moment is expressed as: m is M i ＝M i (h i-1 - hi ，w 0 ，l 0 Po, p, c, lamda, t) (when i=1, t=t 0 ) The method comprises the steps of carrying out a first treatment on the surface of the The integrated load function is expressed as:h i for the thickness after rolling of the ith pass, F Yi For maximum rolling force of rolling mill, M Yi The maximum rolling moment of the rolling mill;
step b, establishing comprehensive equal-load target conditions, namely h 1 ，h 2 ，...h n Satisfying the simultaneous equations: f (f) 1 (h 0 ，h 1 )＝f 2 (h 1 ，h 2 )＝…＝f n (h n-1 ，h n ) =c, monotonic and unique, here the optimal solution of the equation is solved using a recursive solution.
Step c, setting initial reduction distribution h according to the mill force energy parameters 1 ，h 2 ，...h n Calculating a corresponding load value f 1 ，f 2 ，...f n Obtaining an initial coincidence constant C value: c= (f) 1 +f 2 +f n )/n；
Step d, solving f 1 (h 0 ，h 1 ) C < get h =c 1 ，f 2 (h 1 ，h 2 ) C < get h =c 2 And so on, f n-1 (h n-2 ，h n-1 ) C < get h =c n-1 ；
Step e, calculating f n ＝f n (h n-1 ，h n ) And generally f n ≠C；
Step f, using y=f n (h n-1 ，h n ) C is a monotonic function of C, the calculated f n C, as a new C, repeating the calculation in the step C; up to |f n C is less than or equal to mu, and mu is the given error precision; h obtained at this time 1 ，h 2 ，...h n I.e. the optimal thickness distribution under the comprehensive equal load.
Further, the number of passes in the transverse rolling process is small, and the width is wide, so that the C value is preferably 0.2; when the C value is 0, the rolling mill is in a critical state.
Compared with the prior art, the invention has the following advantages:
the invention aims to provide a steel turning mode and a rolling reduction optimization setting method suitable for a rough rolling process of a medium plate. As the links are more in the rolling process of the medium plate, and various methods are involved. Different rolling processes will directly affect the subsequent rolling effect and the quality of the finished product. The invention decides different steel transferring modes and rolling down systems based on the accurate prediction of the rolling force and the temperature field of the medium plate so as to achieve the purposes of improving the quality of the plate shape, saving the rolling time, reducing the power consumption and the like.
Drawings
FIG. 1 is a schematic diagram of a steel turning mode and a rolling system optimization flow;
FIG. 2 is a flowchart of the cogging mode selection;
FIG. 3 is a flow chart of a rolling reduction optimization module in the cross rolling process.
Detailed Description
The invention discloses a method for optimally setting a steel turning mode and a rolling system in a rough rolling process of a medium plate, which is shown in a schematic diagram of an optimized flow of the steel turning mode and the rolling system in FIG. 1; the method comprises the following steps:
step 1, collecting relevant parameters and rolling mill force energy parameters of a steel plate blank and the steel plate blank;
relevant parameters of the steel plate blank include: thickness h of slab 0 Width w 0 Aspect ratio a 1 Length l 0 Poisson's ratio po, density p, specific heat capacity c, thermal conductivity lamda, start rolling temperature t0.
Relevant parameters of the steel plate finished product include: width w of finished product 1 End thickness h of transverse rolling i Ratio of spread a 2 。
The mill force energy parameters include: the diameter d of working rolls of a roughing mill and finishing mill set, the allowable rolling force f, the allowable rolling moment m, the power p of the rolling mill and the transmission speed v of a roller way.
Step 2, four steel conversion modes are set, and are respectively: a direct longitudinal rolling mode without turning steel, a direct transverse rolling mode without cogging, a transverse rolling mode after cogging one pass and a transverse rolling mode after cogging two passes;
step 3, cogging is carried out according to the related parameters of the step 1, and then a steel conversion mode is selected; as shown in fig. 2;
when the stretching ratio a 2 When the steel is less than or equal to 1.05, adopting a direct longitudinal rolling mode without rotating the steel;
when the width to thickness ratio a 1 When the rolling speed is more than 10, adopting a direct transverse rolling mode without cogging;
when the width to thickness ratio a 1 When the rolling speed is less than or equal to 7.5, adopting a transverse rolling mode after two cogging passes;
when the width to thickness ratio a 1 7.5 or more and 10 or less, the spread ratio a is considered 2 The method comprises the steps of carrying out a first treatment on the surface of the When the stretching ratio a 2 When the rolling speed is less than 1.4, adopting a direct transverse rolling mode without cogging; when the stretching ratio a 2 When the rolling speed is more than or equal to 1.4, adopting a transverse rolling mode after one-pass cogging;
step 4, optimizing the rolling reduction system of cogging and transverse rolling; as shown in fig. 3;
when the steel-turning mode is a direct longitudinal rolling mode without turning steel, directly entering a rough rolling stage;
when the steel conversion mode is a cogging direct transverse rolling mode, optimizing a transverse rolling process;
when the steel turning mode is a transverse rolling mode after one-pass cogging, the rolling force is 15%, and the transverse rolling process is optimized; when the stretching is relatively large, the length of the rolled piece before stretching needs to be increased to obtain good plate shape and plane shape. So that a relatively large reduction is adopted according to the capacity of the rolling mill;
when the steel conversion mode is a two-pass cogging after-transverse rolling mode, the first cogging reduction rate alpha 1 And a second cogging reduction rate alpha 2 And the sum is 30%, alpha 1 +α 2 ＝30％，α 2 ＜α 1 The method comprises the steps of carrying out a first treatment on the surface of the Optimizing the transverse rolling process;
the cross rolling process is optimized specifically as follows: in the transverse rolling process, the steel plate is rolled to the required width, and the steel plate is rolled to the required thickness according to the volume invariance theory, namely the thickness h 0 And h i The fixation is unchanged; determining maximum rolling reduction and transverse rolling pass of the rolling mill according to the rolling mill force energy parameters, the steel plate thickness and other data, and determining preliminary rollingA lower system; optimizing the rolling reduction of each pass by using a comprehensive equal-load optimization method, wherein the rolling precision is required to be improved, and the rolling force and rolling power are balanced, and the method specifically comprises the following steps of:
step a, load function f at the ith pass i (h i-1 -h i ) Introducing a load function of force and a load function of moment; and a weighting coefficient alpha, establishing a comprehensive load function;
wherein the load function of the force is expressed as: f (F) i ＝F i (h i-1 -h i ，w 0 ，l 0 Po, p, c, la; ndn, t); the load function of the moment is expressed as: m is M i ＝M i (h i-1 -h i ，w 0 ，l 0 Po, p, c, lamda, t) (when i=1, t=t 0 ) The method comprises the steps of carrying out a first treatment on the surface of the The integrated load function is expressed as:h i for the thickness after rolling of the ith pass, F Yi For maximum rolling force of rolling mill, M Yi The maximum rolling moment of the rolling mill;
step b, establishing comprehensive equal-load target conditions, namely h 1 ，h 2 ，...h n Satisfying the simultaneous equations: f (f) 1 (h 0 ，h 1 )＝f 2 (h 1 ，h 2 )＝…＝f n (h n-1 ，h n ) =c, monotonic and unique, here the optimal solution of the equation is solved using a recursive solution.
Step c, setting initial reduction distribution h according to the mill force energy parameters 1 ，h 2 ，...h n Calculating a corresponding load value f 1 ，f 2 ，...f n Obtaining an initial coincidence constant C value: c= (f) 1 +f 2 +…+f n )/n；
Step d, solving f 1 (h 0 ，h 1 ) C < get h =c 1 ，f 2 (h 1 ，h 2 ) C < get h =c 2 And so on, f n-1 (h n-2 ，h n-1 ) C < get h =c n-1 ；
Step e, calculating f n ＝f n (h n-1 ，h n ) And generally f n ≠C；
Step f, using y=f n (h n-1 ，h n ) C is a monotonic function of C, the calculated f n C, as a new C, repeating the calculation in the step C; up to |f n C is less than or equal to mu, and mu is the given error precision; h obtained at this time 1 ，h 2 ，...h n I.e. the optimal thickness distribution under the comprehensive equal load. The number of passes in the transverse rolling process is less, and the width is wider, so that the C value is preferably 0.2 generally; when the C value is 0, the rolling mill is in a critical state.
Example 1
Step 1, X60 pipeline steel is selected as a material, the thickness of a blank is 300mm, the width is 2300mm, the length is 4.41m, the Poisson ratio is 0.3, and the density is 7930kg/m 3 The specific heat capacity is 0.46 multiplied by 1000J/(kg. DEG C), the heat conductivity coefficient is 21.5W/(m.K), and the initial rolling temperature is 1150 ℃. The width of the finished steel plate is 3500mm.
And 2, selecting a roughing mill with a working roll diameter of 1.24m, a permissible rolling force of 10500kn, a permissible torque of 3000knm and a permissible power of 10000kw.
Step 3, aspect ratio a 1 A spread ratio a of 7.67 2 1.52.
Step 4, due to the aspect ratio a 1 More than 7.5 and less than 10, the stretching ratio a 2 Is larger than 1.4, so that a mode of cogging at one time and then transverse rolling is adopted.
Step 5, the reduction rate of the cogging pass is selected to be 12.4% according to the mill force energy parameter.
Step 6, the reduction rate and the optimization result of each pass in the transverse rolling process are shown in the attached table 1, wherein the weighting coefficient alpha Fi Taking 0.5, alpha Mi Taking 0.5.
TABLE 1 optimization results of one pass cogging and transverse Rolling Process
Example 2
Step 1, X60 pipeline steel is selected as a material, the thickness of a blank is 250mm, the width is 1500mm, the length is 3.19m, the Poisson ratio is 0.3, and the density is 7930kg/m 3 The specific heat capacity is 0.46 multiplied by 1000J/(kg. DEG C), the heat conductivity coefficient is 21.5W/(m.K), and the initial rolling temperature is 1150 ℃. The width of the finished steel plate is 2800mm.
And 2, selecting a roughing mill with a working roll diameter of 1.24m, a permissible rolling force of 10500kn, a permissible torque of 3000knm and a permissible power of 10000kw.
Step 3, aspect ratio a 1 Ratio of a of 6 2 1.87.
Step 4, due to the aspect ratio a 1 Less than 7.5, and adopts a mode of twice cogging and then transverse rolling.
And 5, according to the mill force energy parameters, the rolling reduction of the first cogging pass is selected to be 15.1%, and the rolling reduction of the second cogging pass is selected to be 15.9%.
Step 6, the reduction rate and the optimization result of each pass in the transverse rolling process are shown in the attached table 2, wherein the weighting coefficient alpha Fi Taking 0.5, alpha Mi Taking 0.5.
TABLE 2 optimization results of twice cogging and transverse rolling processes
Example 3
Step 1, X60 pipeline steel is selected as a material, the thickness of a blank is 135mm, the width is 1900mm, the length is 2.47m, the Poisson ratio is 0.3, and the density is 7930kg/m 3 The specific heat capacity is 0.46 multiplied by 1000J/(kg. DEG C), the heat conductivity coefficient is 21.5W/(m.K), and the initial rolling temperature is 1150 ℃. The width of the finished steel plate is 2900mm.
And 2, selecting a roughing mill with a working roll diameter of 1.24m, a permissible rolling force of 10500kn, a permissible torque of 3000knm and a permissible power of 10000kw.
Step 3, aspect ratio a 1 Ratio of a of 14 2 1.52.
Step 4, due to the aspect ratio a 1 And is larger than 10, so that a direct transverse rolling mode without cogging is adopted.
Step 5, the reduction rate and the optimization result of each pass in the transverse rolling process are shown in the attached table 3, wherein the weighting coefficient alpha Fi Taking 0.5, alpha Mi Taking 0.5.
TABLE 3 optimization results of direct cross rolling without blooming
What is not described in detail in the present specification belongs to the prior art known to those skilled in the art. While the foregoing describes illustrative embodiments of the present invention to facilitate an understanding of the present invention by those skilled in the art, it should be understood that the present invention is not limited to the scope of the embodiments, but is to be construed as protected by the accompanying claims insofar as various changes are within the spirit and scope of the present invention as defined and defined by the appended claims.
Claims (6)
1. The method for optimally setting the steel turning mode and the rolling system in the rough rolling process of the medium plate is characterized by comprising the following steps of:
step 1, collecting relevant parameters and rolling mill force energy parameters of a steel plate blank and the steel plate blank;
step 2, four steel conversion modes are set, and are respectively: a direct longitudinal rolling mode without turning steel, a direct transverse rolling mode without cogging, a transverse rolling mode after cogging one pass and a transverse rolling mode after cogging two passes;
step 3, cogging is carried out according to the related parameters of the step 1, and then a steel conversion mode is selected;
when the stretching ratio a 2 When the steel is less than or equal to 1.05, adopting a direct longitudinal rolling mode without rotating the steel;
when the width to thickness ratio a 1 When the rolling speed is more than 10, adopting a direct transverse rolling mode without cogging;
when the width to thickness ratio a 1 When the rolling speed is less than or equal to 7.5, adopting a transverse rolling mode after two cogging passes;
when the width to thickness ratio a 1 7.5 or more and 10 or less, the spread ratio a is considered 2 The method comprises the steps of carrying out a first treatment on the surface of the When the stretching ratio a 2 When the rolling speed is less than 1.4, adopting a direct transverse rolling mode without cogging; when the stretching ratio a 2 When the rolling speed is more than or equal to 1.4, adopting a transverse rolling mode after one-pass cogging;
step 4, optimizing the rolling reduction system of cogging and transverse rolling;
when the steel-turning mode is a direct longitudinal rolling mode without turning steel, directly entering a rough rolling stage;
when the steel conversion mode is a cogging direct transverse rolling mode, optimizing a transverse rolling process;
when the steel turning mode is a transverse rolling mode after one-pass cogging, the rolling force is 15%, and the transverse rolling process is optimized;
when the steel conversion mode is a two-pass cogging after-transverse rolling mode, the first cogging reduction rate alpha 1 And a second cogging reduction rate alpha 2 And the sum is 30%, alpha 1 +α 2 ＝30％，α 2 ＜α 1 The method comprises the steps of carrying out a first treatment on the surface of the Optimizing the transverse rolling process;
the cross rolling process is optimized specifically as follows: in the transverse rolling process, the steel plate is rolled to the required width, and the steel plate is rolled to the required thickness according to the volume invariance theory, namely the thickness h 0 And h i The fixation is unchanged; determining the maximum rolling reduction and the transverse rolling pass of the rolling mill according to the rolling mill force energy parameters, the steel plate thickness and other data, and establishing a preliminary rolling reduction system; and optimizing the reduction rate of each pass by using a comprehensive equal-load optimization method, and improving the rolling precision and balancing the rolling force and rolling power.
2. The method for optimally setting a turning mode and a rolling reduction degree in a rough rolling process of a medium plate according to claim 1, which is characterized in that: the relevant parameters of the steel plate blank in the step 1 include: thickness h of slab 0 Width w 0 Aspect ratio a 1 Length l 0 Poisson ratio po, density p, specific heat capacity c, thermal conductivity lamda, start rolling temperature t 0 。
3. A kind of according to claim 1The method for optimally setting the steel turning mode and the rolling system in the rough rolling process of the medium plate is characterized by comprising the following steps of: the relevant parameters of the steel plate finished product in the step 1 include: width w of finished product 1 End thickness h of transverse rolling i Ratio of spread a 2 。
4. The method for optimally setting a turning mode and a rolling reduction degree in a rough rolling process of a medium plate according to claim 1, which is characterized in that: the rolling mill force energy parameters in the step 1 comprise: the diameter d of working rolls of a roughing mill and finishing mill set, the allowable rolling force f, the allowable rolling moment m, the power p of the rolling mill and the transmission speed v of a roller way.
5. The method for optimizing and setting the turning mode and the rolling reduction degree in the rough rolling process of the medium plate according to claim 1, wherein the cross rolling process optimization specifically comprises the following steps:
step a, load function f at the ith pass i (h i-1 -h i ) Introducing a load function of force and a load function of moment; and a weighting coefficient alpha, establishing a comprehensive load function;
wherein the load function of the force is expressed as: f (F) i ＝F i (h i-1 -h i ，w 0 ，l 0 Po, p, c, lamda, t); the load function of the moment is expressed as: m is M i ＝M i (h i-1 -h i ，w 0 ，l 0 Po, p, c, lamda, t) (when i=1, t=t 0 ) The method comprises the steps of carrying out a first treatment on the surface of the The integrated load function is expressed as:h i for the thickness after rolling of the ith pass, F Yi For maximum rolling force of rolling mill, M Yi The maximum rolling moment of the rolling mill;
step b, establishing comprehensive equal-load target conditions, namely h 1 ，h 2 ，...h n Satisfying the simultaneous equations: f (f) 1 (h 0 ，h 1 )＝f 2 (h 1 ，h 2 )＝…＝f n (h n-1 ，h n ) =c, monotonic and unique;
step c, setting initial reduction distribution h according to the mill force energy parameters 1 ，h 2 ，...h n Calculating a corresponding load value f 1 ，f 2 ，...f n Obtaining an initial coincidence constant C value: c= (f) 1 +f 2 +…+f n )/n；
Step d, solving f 1 (h 0 ，h 1 ) C < get h =c 1 ，f 2 (h 1 ，h 2 ) C < get h =c 2 And so on, f n-1 (h n-2 ，h n-1 ) C < get h =c n-1 ；
Step e, calculating f n ＝f n (h n-1 ，h n ) And generally f n ≠C；
Step f, using y=f n (h n-1 ，h n ) C is a monotonic function of C, the calculated f n C, as a new C, repeating the calculation in the step C; up to |f n C is less than or equal to mu, and mu is the given error precision; h obtained at this time 1 ，h 2 ，...h n I.e. the optimal thickness distribution under the comprehensive equal load.
6. The method for optimally setting a turning mode and a rolling reduction degree in a rough rolling process of a medium plate according to claim 1, which is characterized in that: the number of passes in the transverse rolling process is less, and the width is wider, so that the C value is preferably 0.2 generally; when the C value is 0, the rolling mill is in a critical state.
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