CN107774719B - Dynamic model control method for chamfering position of middle roller of 20-roller rolling mill - Google Patents
Dynamic model control method for chamfering position of middle roller of 20-roller rolling mill Download PDFInfo
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Abstract
The chamfer position of the middle roller of the 20-roller mill is reflected by the stroke position of the oil cylinder and can respond to band steel with different bandwidths and different materials; and dynamic correction control is further introduced on the basis, and the stroke position of the oil cylinder is dynamically corrected on the basis of responding to the bandwidths of different strip steels and different strip steel materials. The dynamic model control method for the intermediate roller chamfering position of the 20-roller mill is realized by designing a position model of an intermediate roller chamfering. Firstly, the uncertainty of manually setting the position of a middle shifting oil cylinder is effectively prevented; secondly, dynamic response to different incoming material width changes and material changes is realized, and the phenomenon of rolling strip breakage caused by the incoming material width changes and the material changes is avoided; and finally, model self-learning correction is introduced, so that the belt breakage phenomenon caused by inaccurate initial setting of the stroke position of a middle chamfering oil cylinder is reduced.
Description
Technical Field
The invention belongs to the technical field of steel rolling, and particularly relates to a dynamic model control method for a chamfer angle position of a middle roller of a 20-roller mill.
Background
At present, products such as oriented silicon steel, high-grade non-oriented silicon steel, stainless steel, special steel, high-strength steel, ultrathin strips and the like are rolled in the world mainly by adopting a 20-roller single-stand rolling mill, namely, one stand and a plurality of rollers are used for carrying out reciprocating rolling.
The main means of controlling the plate profile of the single-stand rolling mill is the movement of a middle roller, the control is carried out by chamfering at two sides of the middle roller, and the currently commonly used middle chamfering mode is as follows: the thickness and the plate shape of the edge strip steel are controlled by chamfering the relative position of the edge of the strip steel through an intermediate roller. The play of an intermediate roll is acted by an oil cylinder connected with the transmission side, the chamfer of the previous intermediate roll is arranged at the operation side of the intermediate roll to control the plate shape of the side edge part of the strip steel operation, and the chamfer of the next intermediate roll is arranged at the transmission side of the intermediate roll to control the plate shape of the side edge part of the strip steel transmission.
An intermediate chamfer position is critical to control of strip profile, especially when the single stand rolling mill is used for reciprocating rolling, an intermediate chamfer must be set in advance. If the position and the setting of one middle chamfer are too large, namely the distance between the edge of the strip steel and one middle chamfer is too large, the edge of the strip steel is tightened and is easy to break; if the position of the middle chamfer is too small, namely the distance between the edge of the strip steel and the middle chamfer is too small, the edge of the strip steel is too loose, the strip is easy to turn over, wave and break, and the position for starting the middle chamfer is very important for the rolling stability.
Due to the change of the width of the rolled strip steel and the switching of steel grades, the position of a middle chamfer needs to be adjusted, and the position is generally controlled by adopting a manual adjustment mode at present, but the width has very large error, the experience requirement on personnel is very high, and the stable requirement cannot be met.
The Chinese invention application with the application number of '201210020839.2' discloses a cold-rolled strip steel plate shape feedforward control system, which comprises: the rolling force variation calculating module is used for calculating the rolling force variation of the current adjacent control period; the control parameter correction module is used for carrying out self-learning correction on the control parameters to obtain the plate shape variation caused by the unit rolling force variation after the self-learning correction; the regulating quantity calculating module is used for calculating the optimal roll bending regulating quantity of the working roll of the rolling mill and the optimal roll bending regulating quantity of the intermediate roll; and the bending feed-forward control execution module and the regulating quantity calculation module are used for regulating the working roll bending device and the intermediate roll bending device according to the optimal bending regulating quantity of the working roll and the optimal bending regulating quantity of the intermediate roll of the rolling mill. The method can realize effective control of the problem of shape quality deterioration caused by frequent fluctuation of rolling force in the process of rolling cold strip steel by using the optimal working roll and intermediate roll bending adjustment amount.
The design analysis and optimization of the intermediate roll shifting device of the stainless steel plate strip multi-roll cold rolling mill, which is intensively recorded in the eighth annual meeting treatise of China' introduces and analyzes the structural characteristics of the intermediate roll axial shifting device of the multi-roll stainless steel strip cold rolling mill of the Sendzimir twenty-high rolling mill, the four-upright-post twenty-high rolling mill and the twelve-high rolling mill which are widely used at present, mainly analyzes and calculates the working mechanical characteristics of the intermediate roll shifting device of the Sendzimir rolling mill, points out the structural design defects and hidden dangers and provides improvement measures.
Disclosure of Invention
In order to solve the problems, the edge shape of the strip steel is controlled, firstly, from the view point of the play amount, the invention establishes the stroke position control of the oil cylinder which can respond to different strip steel bandwidths and different strip steel materials, and further introduces dynamic correction control on the basis of the stroke position control, and realizes the dynamic correction of the stroke position of the oil cylinder on the basis of responding to the different strip steel bandwidths and different strip steel materials. The method comprises the following steps:
the dynamic model control method for the intermediate roller chamfering position of the 20-roller mill is characterized by comprising the following steps of:
the chamfering position is reflected by the stroke position of the oil cylinder and can respond to band steel with different bandwidths and different materials, and the specific method comprises the following steps:
a1: establishing the stroke position T of the oil cylinder according to the mathematical geometry relation and the physical displacement relationXAbout the band width L of the strip steelXAnd the functional relation of the distance S between the chamfer angle and the edge of the strip steel;
a2: representing the strip steels of different materials through the deformation resistance sigma P, and establishing a functional relation of the depth h of the most edge part of the strip steel relative to a middle chamfer angle and the deformation resistance sigma P;
a3: the stroke position T of the oil cylinder is established through the mapping relation between the distance S between the chamfer and the edge of the strip steel and the depth h of the middle chamfer corresponding to the edge of the strip steel through the functional relation conversion of A1 and A2XA functional relationship with the deformation resistance σ P; thereby finally establishing the stroke position T of the oil cylinderXAbout the band width L of the strip steelXAnd resistance to deformation σ P, where LXσ P is an independent variable, TXIs a dependent variable;
the control steps are as follows:
s1: detecting and calculating bandwidth L of incoming strip steelXThe deformation resistance sigma P of the incoming strip steel and the detection calculation value are issued to a process controller;
s2: the process controller receives the bandwidth L of the current incoming band steelXThe value and the deformation resistance sigma P of the current incoming strip steel are calculated through the established mathematical model to obtain the oil cylinder lineDistance position TXAnd the stroke position T of the oil cylinderXSending to a basic automation control machine;
s3: the basic automation control machine receives the stroke position T of the oil cylinderXIssuing an action instruction to a corresponding action execution end;
the stroke position T of the oil cylinderXAbout the band width L of the strip steelXAnd the functional relation of the distance S between the chamfer angle and the edge of the strip steel is as follows:
wherein,
K0: the distance between the center of the rolling mill and the outermost edge part of the middle of the rolling mill is unit mm;
l: the length of a middle chamfer is unit mm;
LX: the width of the strip steel is unit mm;
s: the distance between the chamfer and the edge of the strip steel is unit mm;
TO: the total stroke of a middle shifting oil cylinder is in unit mm;
TX: the stroke position of the oil cylinder is unit mm;
the functional relation of the depth h of the most edge part of the strip steel relative to a middle chamfer angle and the deformation resistance sigma P is as follows:
h: the depth of the most edge part of the strip steel relative to a middle chamfer is in unit mm;
a0: a self-adaptive correction coefficient;
a1: the influence coefficient of the rigidity of the rolling mill;
a2: influence coefficient of roller rigidity;
σ P: the deformation resistance of the strip steel is in MPa;
the mapping relation between the distance S between the chamfer and the edge of the strip steel and the depth h of the middle chamfer corresponding to the edge of the strip steel is as follows:
wherein,
h: the depth of a middle chamfer is in mm;
l: the length of a middle chamfer is unit mm;
h: the depth of the most edge part of the strip steel relative to a middle chamfer is in unit mm;
s: the distance between the chamfer and the edge of the strip steel is unit mm.
The dynamic model control method for the chamfering position of the intermediate roll of the 20-roll mill is characterized by comprising the following steps of:
the whole control system is introduced into dynamic correction control, and dynamic correction of the stroke position of the oil cylinder is realized on the basis of responding to the bandwidths and the materials of different strip steels; the control steps after introducing dynamic correction control are as follows:
SA 1: detecting and calculating bandwidth L of incoming strip steelXThe deformation resistance sigma P of the incoming strip steel and the detection calculation value are issued to a process controller;
SA 2: the process controller receives the bandwidth L of the current incoming band steelXThe value and the deformation resistance sigma P of the current incoming strip steel are calculated through the established mathematical model to obtain the stroke position T of the oil cylinderXAnd the stroke position T of the oil cylinderXSending to a basic automation control machine;
SA 3: the basic automation control machine receives the stroke position T of the oil cylinderXIssuing an action instruction to a corresponding action execution end;
SA 4: the sensor uploads the actual value of the stroke position of the oil cylinder detected in real time to the basic automatic control machine and the basic automatic control machine uploads the actual value to the process control machine;
SA 5: the process control machine compares the actual value received each time with the set value one time before the current actual value, and automatically records the ratio of each time; after recording N times, averaging the ratio of N times, issuing the average to the established mathematical model, and calculating to obtain the corrected stroke position T of the oil cylinderXAnd the corrected stroke position T of the oil cylinderXSending to a basic automation control machine;
SA 6: the basic automation control machine corrects the stroke position T of the oil cylinder according to the received stroke position TXAnd issuing an action instruction to a corresponding action execution end to finish the first correction.
The dynamic model control method for the chamfering position of the intermediate roll of the 20-roll mill is characterized by comprising the following steps of:
and N is 7-9.
The dynamic model control method for the chamfering position of the intermediate roll of the 20-roll mill is characterized by comprising the following steps of:
steps SA4 to SA6 are repeated according to the number of times to be corrected.
The dynamic model control method for the chamfering position of the intermediate roll of the 20-roll mill is characterized by comprising the following steps of:
a is described0The average value of the ratio of the actual value of the stroke of the N oil cylinders to the set value is obtained.
The invention relates to a dynamic model control method for chamfering positions of intermediate rolls of a 20-roll mill; the method is suitable for setting all rolling mill models with chamfering and intermediate rolls, and manual zero intervention is realized. Through the design of a position model of a middle roller chamfer, the influence of the width change of the supplied materials, the material change of the supplied materials and relevant characteristics on the rolling stability is fully considered, the edge plate shape required by the stable through plate rolling is taken as a starting point, and the dynamic setting of the position of a middle shifting oil cylinder is realized. Firstly, the uncertainty of manually setting the position of a middle shifting oil cylinder is effectively prevented; secondly, dynamic response to different incoming material width changes and material changes is realized, and the phenomenon of rolling strip breakage caused by the incoming material width changes and the material changes is avoided; and finally, model self-learning correction is introduced, so that the belt breakage phenomenon caused by inaccurate initial setting of the stroke position of a middle chamfering oil cylinder is reduced.
Drawings
FIG. 1 is a schematic view of the relationship between a middle chamfer and the edge of a strip steel in the present invention;
FIG. 2 is a schematic diagram of a mathematical relationship modeling process in the present invention;
FIG. 3 is a flow chart of a process control before dynamic correction control is introduced in the present invention;
FIG. 4 is a flow chart of process control before dynamic correction control is introduced in the present invention;
FIG. 5 is a graph showing effects of example 1 according to the present invention;
FIG. 6 is a graph showing effects of example 2 of the present invention.
In the figure;
K0: the distance from the center position of the rolling mill to the most edge part in the middle is taken as the distance;
l: is the length of a middle chamfer;
LX: is the width of the strip steel;
s: the distance between the chamfer angle and the edge of the strip steel is;
h: is the depth of a middle chamfer;
h: the depth of the most edge part of the strip steel relative to a middle chamfer is shown.
Detailed Description
Hereinafter, the method for controlling the dynamic model of the chamfering position of the intermediate roll in the 20-high rolling mill according to the present invention will be described in more detail with reference to the drawings and the embodiments of the present specification.
As shown in fig. 1 and 2, the chamfer position of the intermediate roll of the 20-roll mill is represented by the stroke position of the oil cylinder and can respond to strip steels with different bandwidths and different materials, and the method comprises the following specific steps:
a1: establishing the stroke position T of the oil cylinder according to the mathematical geometry relation and the physical displacement relationXAbout the band width L of the strip steelXAnd the functional relation of the distance S between the chamfer angle and the edge of the strip steel;
a2: representing the strip steels of different materials through the deformation resistance sigma P, and establishing a functional relation of the depth h of the most edge part of the strip steel relative to a middle chamfer angle and the deformation resistance sigma P;
a3: the stroke position T of the oil cylinder is established through the mapping relation between the distance S between the chamfer and the edge of the strip steel and the depth h of the middle chamfer corresponding to the edge of the strip steel through the functional relation conversion of A1 and A2XA functional relationship with the deformation resistance σ P; thereby finally establishing the stroke position T of the oil cylinderXAbout the band width L of the strip steelXAnd the resistance to deformation sigma P as a function of,wherein L isXσ P is an independent variable, TXIs a dependent variable.
As shown in fig. 3, the steps of the control are as follows:
s1: detecting and calculating bandwidth L of incoming strip steelXThe deformation resistance sigma P of the incoming strip steel and the detection calculation value are issued to a process controller;
s2: the process controller receives the bandwidth L of the current incoming band steelXThe value and the deformation resistance sigma P of the current incoming strip steel are calculated through the established mathematical model to obtain the stroke position T of the oil cylinderXAnd the stroke position T of the oil cylinderXSending to a basic automation control machine;
s3: the basic automation control machine receives the stroke position T of the oil cylinderXAnd issuing the action command to the corresponding action execution end.
Wherein,
the stroke position T of the oil cylinderXAbout the band width L of the strip steelXAnd the functional relation of the distance S between the chamfer angle and the edge of the strip steel is as follows:
wherein,
K0: the distance between the center of the rolling mill and the outermost edge part of the middle of the rolling mill is unit mm;
l: the length of a middle chamfer is unit mm;
LX: the width of the strip steel is unit mm;
s: the distance between the chamfer and the edge of the strip steel is unit mm;
TO: the total stroke of a middle shifting oil cylinder is in unit mm;
TX: the stroke position of the oil cylinder is unit mm.
Wherein,
the functional relation of the depth h of the most edge part of the strip steel relative to a middle chamfer angle and the deformation resistance sigma P is as follows:
h: the depth of the most edge part of the strip steel relative to a middle chamfer is in unit mm;
a0: a self-adaptive correction coefficient;
a1: the influence coefficient of the rigidity of the rolling mill;
a2: influence coefficient of roller rigidity;
σ P: the deformation resistance of the strip steel is in MPa.
Wherein,
the mapping relation between the distance S between the chamfer and the edge of the strip steel and the depth h of the middle chamfer corresponding to the edge of the strip steel is as follows:
wherein,
h: the depth of a middle chamfer is in mm;
l: the length of a middle chamfer is unit mm;
h: the depth of the most edge part of the strip steel relative to a middle chamfer is in unit mm;
s: the distance between the chamfer and the edge of the strip steel is unit mm.
In which, as shown in figure 4,
the whole control system is introduced into dynamic correction control, and dynamic correction of the stroke position of the oil cylinder is realized on the basis of responding to the bandwidths and the materials of different strip steels; the control steps after introducing dynamic correction control are as follows:
SA 1: detecting and calculating bandwidth L of incoming strip steelXThe deformation resistance sigma P of the incoming strip steel and the detection calculation value are issued to a process controller;
SA 2: the process controller receives the bandwidth L of the current incoming band steelXThe value and the deformation resistance sigma P of the current incoming strip steel are calculated through the established mathematical model to obtain the stroke position T of the oil cylinderXAnd the stroke position T of the oil cylinderXSending to a basic automation control machine;
SA 3: the basic automation control machine receives the stroke position T of the oil cylinderXIssuing an action instruction to a corresponding action execution end;
SA 4: the sensor uploads the actual value of the stroke position of the oil cylinder detected in real time to the basic automatic control machine and the basic automatic control machine uploads the actual value to the process control machine;
SA 5: the process control machine compares the actual value received each time with the set value one time before the current actual value, and automatically records the ratio of each time; after recording N times, averaging the ratio of N times, issuing the average to the established mathematical model, and calculating to obtain the corrected stroke position T of the oil cylinderXAnd the corrected stroke position T of the oil cylinderXSending to a basic automation control machine;
SA 6: the basic automation control machine corrects the stroke position T of the oil cylinder according to the received stroke position TXAnd issuing an action instruction to a corresponding action execution end to finish the first correction.
Wherein,
and N is 7-9.
Wherein,
steps SA4 to SA6 are repeated according to the number of times to be corrected.
Wherein,
a is described0The average value of the ratio of the actual value of the stroke of the N oil cylinders to the set value is obtained.
The working principle is as follows:
1. as shown in fig. 1, the key to control the shape of the strip steel edge is to set the depth of the chamfer corresponding to the middle position of the strip steel edge, so that a relative relationship between the middle chamfer and the strip steel needs to be established, and when a middle shifting cylinder is at the initial position, the following relationship exists:
K0-L＝Lx/2-S (1)
H/L＝h/S (2)
wherein:
s: the distance between the chamfer and the edge of the strip steel is unit mm;
l: the length of a middle chamfer is unit mm;
h: the depth of a middle chamfer is in mm;
lx: the width of the strip steel is unit mm;
K0: center position of rolling millThe distance from the most edge part of the middle part is set in mm;
h: the depth of the most edge part of the strip steel relative to a middle chamfer angle is unit mm.
2. Because the distance S between the chamfer and the edge of the strip steel is changed by the play of a middle play oil cylinder, the depth h of the edge of the strip steel relative to a middle chamfer is adjusted, and the relation between the position of the oil cylinder and the position of the S is as follows:
K0-L＝Lx/2-S+(To-Tx) (3)
wherein:
to: the total stroke of a middle shifting oil cylinder is in unit mm;
tx: a middle cylinder stroke position (i.e., cylinder set position) in mm.
3. Due to the characteristics of steel materials, the deformation resistance is different when the materials are different, but the requirements on the stability of the edge plate shape are consistent, and the value of the edge plate shape I has a very large relation with the relative depth h of an intermediate chamfer and the deformation resistance sigma p of the materials. If the value of edge plate type I is too large, the edge plate is likely to turn over and break the belt, and if the value of edge plate type I is too small, the edge plate is likely to break. In order to ensure stable rolling, the value of the edge I is generally fixed, and under the condition that the value of the edge I is fixed, the following relation between the deformation resistance sigma p and the relative depth h of an intermediate chamfer is established:
h＝a0*a1*a2*0.25*(σp/500)2(4)
wherein:
a0: the value of the self-adaptive correction coefficient is generally 0.98-1.02, and dynamic calculation correction can also be carried out by a computer;
a1: the value of the influence coefficient of the rigidity of the rolling mill is generally 0.98-1.05;
a2: the influence coefficient of the rigidity of the roller is generally 0.95-1.05;
σ p: the deformation resistance of the strip steel is unit MPa, and can be obtained by a tensile test in a laboratory.
On the basis of a certain edge I value, namely taking an appropriate edge I value as a starting point, and combining the characteristics of the steel grade, establishing a relation between a preset stroke position Tx of an intermediate oil cylinder and the width of the strip steel and the deformation resistance sigma p of the steel grade according to (2), (3) and (4), and as follows:
Tx＝T0+L+0.5*Lx-K0-a0*a1*a2*0.25*(σp/500)2*L/H (5)
wherein:
tx: the stroke position of an intermediate oil cylinder (namely the set position of the oil cylinder) is in unit mm;
to: the total stroke of a middle shifting oil cylinder is in unit mm;
l: the length of a middle chamfer is unit mm;
lx: the width of the strip steel is unit mm;
K0: the distance between the center of the rolling mill and the outermost edge part of the middle of the rolling mill is unit mm;
a0: the value of the self-adaptive correction coefficient is generally 0.98-1.02, and dynamic calculation correction can also be carried out by a computer;
a1: the value of the influence coefficient of the rigidity of the rolling mill is generally 0.98-1.05;
a2: the influence coefficient of the rigidity of the roller is generally 0.95-1.05;
σ p: the deformation resistance of the strip steel is unit MPa, and can be obtained by a tensile test in a laboratory;
h: the depth of a middle chamfer, in mm.
Therefore, in a computer control system, the control model is set, the position of a middle chamfer is dynamically adjusted according to the width change through different material characteristics, the purpose of automatic setting is achieved, meanwhile, in order to ensure the stability of the system, the control model is continuously corrected and perfected through the self-learning function of the model, and the stability of the system can be ensured.
Examples
The invention is used on a single-stand twenty-high roll mill in a certain steel mill for rolling high-grade silicon steel products, the total stroke To of a middle shifting oil cylinder of the single-stand roll mill is 170mm, and the distance K between the center position of the roll mill and the middle most edge part0Is 835 mm.
The specific embodiment is as follows:
1. a middle roller with the chamfer length of 300mm and the depth of 0.44mm is used, the rolling width is 1200mm, the deformation resistance is 510Mpa, the rigidity influence coefficient is 1.02, and the roller rigidity influence coefficient is 1.03; the initial setting position of the cylinder of the previous intermediate roll is 48.69, so that the edge plate profile I value can be ensured to obtain the stable plate profile shown in figure 5.
2. A middle roller with the chamfer length of 375mm and the depth of 0.67mm is used for rolling a product with the rolling width of 1000mm and the deformation resistance of 400Mpa, the rigidity influence coefficient is 1.02, and the roller rigidity influence coefficient is 1.03; the initial setting position of the cylinder of the intermediate roll before rolling is 115.92, which ensures that the edge panel type I value obtains a stable panel type as shown in FIG. 6.
The invention relates to a dynamic model control method for chamfering positions of intermediate rolls of a 20-roll mill; the method is suitable for setting all rolling mill models with chamfering and intermediate rolls, and manual zero intervention is realized. Through the design of a position model of a middle roller chamfer, the influence of the width change of the supplied materials, the material change of the supplied materials and relevant characteristics on the rolling stability is fully considered, the edge plate shape required by the stable through plate rolling is taken as a starting point, and the dynamic setting of the position of a middle shifting oil cylinder is realized. Firstly, the uncertainty of manually setting the position of a middle shifting oil cylinder is effectively prevented; secondly, dynamic response to different incoming material width changes and material changes is realized, and the phenomenon of rolling strip breakage caused by the incoming material width changes and the material changes is avoided; and finally, model self-learning correction is introduced, so that the belt breakage phenomenon caused by inaccurate initial setting of the stroke position of a middle chamfering oil cylinder is reduced.
Claims (5)
1.20 rolling mill intermediate roll chamfer position dynamic model control method, its characteristic is:
the chamfer position reflects through hydro-cylinder stroke position to can respond to the belted steel of different bandwidth, different materials, include:
a1: establishing the stroke position T of the oil cylinder according to the mathematical geometry relation and the physical displacement relationXAbout the band width L of the strip steelXAnd the functional relation of the distance S between the chamfer angle and the edge of the strip steel;
a2: representing the strip steels of different materials through the deformation resistance sigma P, and establishing a functional relation of the depth h of the most edge part of the strip steel relative to a middle chamfer angle and the deformation resistance sigma P;
a3: the stroke position T of the oil cylinder is established through the mapping relation between the distance S between the chamfer and the edge of the strip steel and the depth h of the middle chamfer corresponding to the edge of the strip steel through the functional relation conversion of A1 and A2XA functional relationship with the deformation resistance σ P; thereby finally establishing the stroke position T of the oil cylinderXAbout the band width L of the strip steelXAnd resistance to deformation σ P, where LXσ P is an independent variable, TXIs a dependent variable;
the control steps are as follows:
s1: detecting and calculating bandwidth L of incoming strip steelXThe deformation resistance sigma P of the incoming strip steel and the detection calculation value are issued to a process controller;
s2: the process controller receives the bandwidth L of the current incoming band steelXThe value and the deformation resistance sigma P of the current incoming strip steel are calculated through the established mathematical model to obtain the stroke position T of the oil cylinderXAnd the stroke position T of the oil cylinderXSending to a basic automation control machine;
s3: the basic automation control machine receives the stroke position T of the oil cylinderXIssuing an action instruction to a corresponding action execution end;
the stroke position T of the oil cylinderXAbout the band width L of the strip steelXAnd the functional relation of the distance S between the chamfer angle and the edge of the strip steel is as follows:
wherein,
K0: the distance between the center of the rolling mill and the outermost edge part of the middle of the rolling mill is unit mm;
l: the length of a middle chamfer is unit mm;
LX: the width of the strip steel is unit mm;
s: the distance between the chamfer and the edge of the strip steel is unit mm;
TO: the total stroke of a middle shifting oil cylinder is in unit mm;
TX: the stroke position of the oil cylinder is unit mm;
the functional relation of the depth h of the most edge part of the strip steel relative to a middle chamfer angle and the deformation resistance sigma P is as follows:
h: the depth of the most edge part of the strip steel relative to a middle chamfer is in unit mm;
a0: a self-adaptive correction coefficient;
a1: the influence coefficient of the rigidity of the rolling mill;
a2: influence coefficient of roller rigidity;
σ P: the deformation resistance of the strip steel is in MPa;
the mapping relation between the distance S between the chamfer and the edge of the strip steel and the depth h of the middle chamfer corresponding to the edge of the strip steel is as follows:
wherein,
h: the depth of a middle chamfer is in mm;
l: the length of a middle chamfer is unit mm;
h: the depth of the most edge part of the strip steel relative to a middle chamfer is in unit mm;
s: the distance between the chamfer and the edge of the strip steel is unit mm.
2. The dynamic model control method for the intermediate roll chamfer position of the 20-high rolling mill according to claim 1, characterized in that:
the whole control system is introduced into dynamic correction control, and dynamic correction of the stroke position of the oil cylinder is realized on the basis of responding to the bandwidths and the materials of different strip steels; the control steps after introducing dynamic correction control are as follows:
SA 1: detecting and calculating bandwidth L of incoming strip steelXThe deformation resistance sigma P of the incoming strip steel and the detection calculation value are issued to a process controller;
SA 2: the process controller receives the bandwidth L of the current incoming band steelXThe value and the deformation resistance sigma P of the current incoming strip steel are calculated through the established mathematical model to obtain the stroke position T of the oil cylinderXAnd the stroke position T of the oil cylinderXSending to a basic automation control machine;
SA 3: the basic automation control machine receives the stroke position T of the oil cylinderXIssuing an action instruction to a corresponding action execution end;
SA 4: the sensor uploads the actual value of the stroke position of the oil cylinder detected in real time to the basic automatic control machine and the basic automatic control machine uploads the actual value to the process control machine;
SA 5: the process control machine compares the actual value received each time with the set value one time before the current actual value, and automatically records the ratio of each time; after recording N times, averaging the ratio of N times, issuing the average to the established mathematical model, and calculating to obtain the corrected stroke position T of the oil cylinderXAnd the corrected stroke position T of the oil cylinderXSending to a basic automation control machine;
SA 6: the basic automation control machine corrects the stroke position T of the oil cylinder according to the received stroke position TXAnd issuing an action instruction to a corresponding action execution end to finish the first correction.
3. The dynamic model control method for the intermediate roll chamfer position of the 20-high rolling mill according to claim 2, characterized in that: and N is 7-9.
4. The dynamic model control method for the intermediate roll chamfer position of the 20-high rolling mill according to claim 2, characterized in that: steps SA4 to SA6 are repeated according to the number of times to be corrected.
5. The dynamic model control method for the intermediate roll chamfer position of the 20-high rolling mill according to claim 1, characterized in that: a is described0The average value of the ratio of the actual value of the stroke of the N oil cylinders to the set value is obtained.
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| JPS58176002A (en) * | 1982-04-07 | 1983-10-15 | Ishikawajima Harima Heavy Ind Co Ltd | Method and device for rolling |
| US6868707B2 (en) * | 2001-02-05 | 2005-03-22 | Hitachi, Ltd. | Rolling method for strip rolling mill and strip rolling equipment |
| CN101254508A (en) * | 2008-01-30 | 2008-09-03 | 武汉钢铁(集团)公司 | Work roll with steel rim drop-control and flat degree control |
| CN103394513A (en) * | 2013-08-15 | 2013-11-20 | 天津市荣泰新型复合材料有限公司 | UCM six-roller mill |
| CN104289524A (en) * | 2014-09-15 | 2015-01-21 | 燕山大学 | Complex wave shape control method suitable for four-roll leveling unit |
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| JPS58176002A (en) * | 1982-04-07 | 1983-10-15 | Ishikawajima Harima Heavy Ind Co Ltd | Method and device for rolling |
| US6868707B2 (en) * | 2001-02-05 | 2005-03-22 | Hitachi, Ltd. | Rolling method for strip rolling mill and strip rolling equipment |
| CN101254508A (en) * | 2008-01-30 | 2008-09-03 | 武汉钢铁(集团)公司 | Work roll with steel rim drop-control and flat degree control |
| CN103394513A (en) * | 2013-08-15 | 2013-11-20 | 天津市荣泰新型复合材料有限公司 | UCM six-roller mill |
| CN104289524A (en) * | 2014-09-15 | 2015-01-21 | 燕山大学 | Complex wave shape control method suitable for four-roll leveling unit |
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