CN109158429B - Edge drop control method for producing silicon steel by Sendzimir rolling mill - Google Patents
Edge drop control method for producing silicon steel by Sendzimir rolling mill Download PDFInfo
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- 238000005096 rolling process Methods 0.000 title claims abstract description 35
- 229910000976 Electrical steel Inorganic materials 0.000 title claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 238000000034 method Methods 0.000 claims abstract description 27
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 230000000694 effects Effects 0.000 abstract description 9
- 238000005097 cold rolling Methods 0.000 abstract description 2
- 238000011217 control strategy Methods 0.000 abstract 1
- 230000003631 expected effect Effects 0.000 description 7
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 239000003550 marker Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
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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
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
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Abstract
The invention discloses a method for controlling edge drop of silicon steel produced by a Sendzimir rolling mill, which relates to the technical field of cold rolling, and comprises the following steps: obtaining a middle roller shape curve function; determining an intermediate roll from actual equipment parameters of a Sendzimir rolling millInitial radius R0A middle roll body length L; obtaining the coordinates x of the mark point1And x2(ii) a Determining the roll shape coefficient k1And a, b, c; an intermediate roll profile is determined. By giving the roll shape of the single-taper one-middle roll and the roll shifting control strategy, the technical effects of effectively controlling the edge drop of the silicon steel, realizing high-precision control of the transverse thickness difference and greatly improving the yield are achieved.
Description
Technical Field
The invention relates to the technical field of cold rolling, in particular to a method for controlling edge drop of silicon steel produced by a Sendzimir rolling mill.
Background
Silicon steel is an important raw material in the power electronic industry, is mainly applied to the production of products such as motors, transformers and the like, and provides higher requirements for the control of the profile of the section of cold-rolled silicon steel, particularly the control of edge drop and the control of transverse thickness difference of thin products, and becomes the difficult point of controlling the plate shape of the cold-rolled high-precision silicon steel production.
However, in the process of implementing the technical solution in the embodiment of the present invention, the inventor of the present invention finds that the above prior art has at least the following technical problems:
in the prior art, the roll shifting of the roll shape of an intermediate roll of the Sendzimir rolling mill reduces the silicon steel edge drop to a certain extent, but the expected effect is not achieved, so that the edge drop cannot be effectively controlled, the transverse thickness difference precision is not high, and the yield is low.
Disclosure of Invention
The embodiment of the invention provides a method for controlling the edge drop of silicon steel produced by a Sendzimir rolling mill, which is used for solving the technical problems that in the prior art, the edge drop of the silicon steel is reduced to a certain extent by the roll shifting of a middle roller shape of the Sendzimir rolling mill, but the expected effect is not achieved, so that the edge drop cannot be effectively controlled, the lateral thickness difference precision is not high, and the yield is low.
In order to solve the above problems, an embodiment of the present invention provides a method for controlling edge drop in silicon steel production using a sendzimir mill, including: obtaining a middle roller shape curve function; determining an initial radius R of an intermediate roll according to actual equipment parameters of a Sendzimir rolling mill0A middle roll body length L; obtaining the coordinates x of the mark point1And x2(ii) a Determining the roll shape coefficient k1And a, b, c; an intermediate roll profile is determined.
Preferably, the method further comprises: when the roller is configured, the two upper middle rollers and the two lower middle rollers are arranged in an antisymmetric mode, and in an initial state, the two upper middle rollers and the two lower middle rollers respectively axially shift in opposite directions.
Preferably, the method further comprises: the relationship between the amount of run-out S, the strip width B and the amount of roll-edge entry δ of an intermediate roll is:
wherein, delta is the entering amount of the roller-shaped edge part of the intermediate roller, and the unit is mm;
b is the width of the strip steel, and the unit is mm;
S0is an initial movement amount of the intermediate roll, and the unit is mm;
s is the play of a middle roller, and the unit is mm.
Preferably, the method further comprises: during the first pass of rolling, the value range of the roll-shaped edge entering amount delta of an intermediate roll is [160mm, 200mm ]; after the second pass, the roll-shaped edge entry delta of an intermediate roll was found to have a value in the range [150mm, 200mm ].
Preferably, the roll shape curve function of the intermediate roll is specifically as follows:
wherein y (x) is a function of the intermediate roll radius in mm;
x is a middle roller body coordinate with one end of a middle roller as an end point, and the unit is mm;
R0is an intermediate roll initial radius in mm;
k1is roll form factor in mm-1；
a. b and c are roll shape coefficients, and a is in mm-1B is dimensionless and c is in mm;
l is the length of a middle roller body, and the unit is mm;
x1and x2Is the coordinate of the mark point and has the unit of mm.
Preferably, the obtaining of the coordinates x of the marker point1And x2The method specifically comprises the following steps:
the coordinates x of the mark point1And x2The calculation formula of (2) is as follows:
x1＝0.7L1(2)
determining x according to equation (2)1Determining x according to equation (3)2。
Preferably, the roll form factor k is determined1And a, b, c, specifically:
according to the formula
Wherein d is1As a coordinate x of the index point2The corresponding chamfering depth is in mm;
d is the corresponding chamfering depth of the roll body L;
k1is roll form factor in mm-1；
L is the length of the middle roller body in mm.
One or more technical solutions in the embodiments of the present invention at least have one or more of the following technical effects:
1. the embodiment of the invention provides a method for controlling edge drop of silicon steel produced by a Sendzimir rolling mill, which comprises the following steps: obtaining a middle roller shape curve function; determining an initial radius R of an intermediate roll according to actual equipment parameters of a Sendzimir rolling mill0A middle roll body length L; obtaining the coordinates x of the mark point1And x2(ii) a Determining the roll shape coefficient k1And a, b, c; an intermediate roll profile is determined. The technical problems that in the prior art, the silicon steel edge drop is reduced to a certain extent by the roller shifting of the roller shape of an intermediate roller of the Sendzimir rolling mill, but the expected effect is not achieved, so that the edge drop cannot be effectively controlled, the accuracy of the transverse thickness difference is not high, and the yield is low are solved.
2. The embodiment of the invention specifically comprises the following steps of:
wherein y (x) is a function of the intermediate roll radius in mm; x is a middle roller body coordinate with one end of a middle roller as an end point, and the unit is mm; r0Is an intermediate roll initial radius in mm; k is a radical of1Is roll form factor in mm-1(ii) a a. b and c are roll shape coefficients, and a is in mm-1B is dimensionless and c is in mm; l is the length of a middle roller body, and the unit is mm; x is the number of1And x2Is a mark point coordinate, and the unit is mm, thereby further achieving the technical effect of effectively controlling the edge drop of the silicon steel.
3. In the embodiment of the invention, when the rollers are configured, two upper middle rollers and two lower middle rollers are arranged in a antisymmetric way, and in an initial state, the two upper middle rollers and the two lower middle rollers respectively axially shift in opposite directions; the relationship between the amount of run-out S, the strip width B and the amount of roll-edge entry δ of an intermediate roll is:
wherein, delta is the entering amount of the roller-shaped edge part of the intermediate roller, and the unit is mm; b is the width of the strip steel, and the unit is mm; s0Is an initial movement amount of the intermediate roll, and the unit is mm; s is a middle roller play amount, and the unit is mm; during the first pass of rolling, the value range of the roll-shaped edge entering amount delta of an intermediate roll is [160mm, 200mm ]](ii) a After the second pass, the roll-shaped edge entry delta of an intermediate roll is in the range of [150mm, 200mm ]]. Further realize high accuracy control lateral thickness difference, improved the technological effect of lumber recovery greatly.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
FIG. 1 is a schematic flow chart illustrating a method for controlling edge drop in silicon steel production using a Sendzimir rolling mill according to an embodiment of the present invention;
FIG. 2 is a roll profile of an intermediate roll in an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a method for controlling edge drop of silicon steel produced by a Sendzimir rolling mill, which solves the technical problems that in the prior art, the edge drop of the silicon steel is reduced to a certain extent by the roll shifting of a middle roll shape of the Sendzimir rolling mill, but the expected effect is not achieved, so that the edge drop cannot be effectively controlled, the lateral thickness difference precision is not high, and the yield is low.
In order to solve the technical problems, the technical scheme provided by the invention has the following general idea: obtaining a middle roller shape curve function; determining an initial radius R of an intermediate roll according to actual equipment parameters of a Sendzimir rolling mill0A middle roll body length L; obtaining the coordinates x of the mark point1And x2(ii) a Determining the roll shape coefficient k1And a, b, c; an intermediate roll profile is determined. The technical problems that in the prior art, the silicon steel edge drop is reduced to a certain extent by the roller shifting of the roller shape of an intermediate roller of the Sendzimir rolling mill, but the expected effect is not achieved, so that the edge drop cannot be effectively controlled, the accuracy of the transverse thickness difference is not high, and the yield is low are solved.
The technical solutions of the present invention are described in detail below with reference to the drawings and the specific embodiments, and it should be understood that the specific features in the embodiments and the embodiments are detailed descriptions of the technical solutions of the present application, and are not limitations of the technical solutions of the present application, and the technical features in the embodiments and the embodiments of the present invention may be combined with each other without conflict.
Example one
An embodiment of the present invention provides a method for controlling edge drop in silicon steel production using a sendzimir mill, and with reference to fig. 1, the method includes:
step S110: obtaining a middle roller shape curve function;
further, the roll shape curve function of the intermediate roll is specifically as follows:
wherein y (x) is a function of the intermediate roll radius in mm;
x is a middle roller body coordinate with one end of a middle roller as an end point, and the unit is mm;
R0is an intermediate roll initial radius in mm;
k1is roll form factor in mm-1；
a. b and c are roll shape coefficients, and a is in mm-1B is dimensionless and c is in mm;
l is the length of a middle roller body, and the unit is mm;
x1and x2Is the coordinate of the mark point and has the unit of mm.
Step S120: determining an initial radius R of an intermediate roll according to actual equipment parameters of a Sendzimir rolling mill0A middle roll body length L;
step S130: obtaining the coordinates x of the mark point1And x2；
Further, the coordinates x of the mark points are obtained1And x2The method specifically comprises the following steps: the coordinates x of the mark point1And x2The calculation formula of (2) is as follows:
x1＝0.7L1(2)
determining x according to equation (2)1Determining x according to equation (3)2。
Step S140: determining the roll shape coefficient k1And a, b, c;
further, the roll shape coefficient k is determined1And a, b, c, specifically:
according to the formula
Wherein d is1As a coordinate x of the index point2The corresponding chamfering depth is in mm;
d is the corresponding chamfering depth of the roll body L;
k1is roll form factor in mm-1；
L is the length of the middle roller body in mm.
Step S150: an intermediate roll profile is determined.
Specifically, at present, the roll shifting of an intermediate roll shape proposed for the sendzimir mill can reduce the silicon steel edge drop to a certain extent, but does not achieve the expected effect, so the embodiment of the application provides a method more suitable for controlling the silicon steel edge drop of the sendzimir mill to control the edge drop, and the lateral thickness difference precision is improved. Step S110, designing a single-taper-middle roller shape beneficial to edge drop control by tracking and analyzing profile data of field rolling mill equipment and production strip steel plates in real time, wherein the single-taper-middle roller shape curve comprises three sections of curves and is expressed by a piecewise function, the roll gap convexity adjusting capability is basically unchanged while the edge drop control capability is increased in a plate width range, and the roll shape curve equation of the single-taper-middle roller is as follows:
wherein y (x) is a function of the intermediate roll radius in mm;
x is a middle roller body coordinate with one end of a middle roller as an end point, and the unit is mm;
R0is an intermediate roll initial radius in mm;
k1is roll form factor in mm-1；
a. b and c are roll shape coefficients, and a is in mm-1B is dimensionless and c is in mm;
l is the length of a middle roller body, and the unit is mm;
x1and x2Is the coordinate of a mark point, and the unit is mm;
from the roll profile equation for an intermediate roll, it can be seen that to determine the roll profile function for an intermediate roll, the unknown R in equation (1) is required0、k1、a、b、c、L、x1And x2The determinations are made separately. Step S120: in bookIn the application example, taking the actual equipment parameter of a certain Sendzimir rolling mill as an example, the initial radius R of an intermediate roll is determined070mm, an intermediate roll length L1500 mm, and then step S130 is performed to obtain the index point coordinate x in the intermediate roll profile function1And x2Wherein the obtained marker point coordinates x1And x2The method specifically comprises the following steps: the coordinates x of the mark point1And x2The specific calculation formula of (A) is as follows:
x1＝0.7L1(2)
substituting the intermediate roll barrel length L obtained in step 120 of 1500mm into formula (2) according to formula (2), i.e., x10.7 × 1500, and x is determined11050mm, the intermediate roll barrel length L obtained in step 120 is 1500mm according to formula (3), and is substituted into formula (3), i.e.
And then determine x21300 mm. Next, the flow proceeds to step S140: determining the roll shape coefficient k1And a, b, c, wherein the determined roll shape coefficient k1And a, b, c, specifically:
according to the formula
Wherein d is1As a coordinate x of the index point2The corresponding chamfering depth is in mm;
d is the corresponding chamfering depth of the roll body L;
k1is roll form factor in mm-1；
L is the length of the middle roller body in mm.
Determining the optimal chamfering depth d by analyzing the actual state and theory of the on-site rolling mill10.30mm, 0.80 mm; further combining the stepsS120 and S130, determining the roll shape coefficient k1And a, b, c, wherein k1＝4.8×10-5mm-1；a＝5.0×10-7mm-1，b＝1.1×10-3，c＝-2.275mm。
Step S150: through the above steps S110 to S140, the unknown parameters in the roll shape curve equation of the intermediate roll are determined, and thus the roll shape curve equation of the single-taper intermediate roll can be further expressed as:
further achieving the technical effect of effectively controlling the edge drop of the cold-rolled silicon steel.
Further, the method further comprises: when the roller is configured, the two upper middle rollers and the two lower middle rollers are arranged in an antisymmetric mode, and in an initial state, the two upper middle rollers and the two lower middle rollers respectively axially shift in opposite directions.
Further, the method further comprises: the relationship between the amount of run-out S, the strip width B and the amount of roll-edge entry δ of an intermediate roll is:
wherein, delta is the entering amount of the roller-shaped edge part of the intermediate roller, and the unit is mm;
b is the width of the strip steel, and the unit is mm;
S0is an initial movement amount of the intermediate roll, and the unit is mm;
s is the play of a middle roller, and the unit is mm.
Further, the method further comprises: during the first pass of rolling, the value range of the roll-shaped edge entering amount delta of an intermediate roll is [160mm, 200mm ]; after the second pass, the roll-shaped edge entry delta of an intermediate roll was found to have a value in the range [150mm, 200mm ].
Specifically, when the roll profile curve of the intermediate roll is determined, the shift amount of the intermediate roll under the width of the strip steel of the sendzimir mill rolled by the intermediate roll is further determined, when the rolls are configured, the two previous intermediate rolls and the two next intermediate rolls are arranged in an anti-symmetric manner, and in an initial state, the two previous intermediate rolls and the two next intermediate rolls axially shift in opposite directions respectively. When rolling a strip of width B, the relationship between the amount of play S and the strip width B and the amount of entry of the roll-shaped edge δ of an intermediate roll is:
wherein, delta is the entering amount of the roller-shaped edge part of the intermediate roller, and the unit is mm;
b is the width of the strip steel, and the unit is mm;
S0is an initial movement amount of the intermediate roll, and the unit is mm;
s is the play of a middle roller, and the unit is mm.
When the Sendzimir mill is actually configured with the rollers, an initial position S of the intermediate roller shifting060mm, the roll-shaped edge entering amount delta of an intermediate roll in the first pass of rolling is in the range of [160mm, 200mm ]]After the second pass, the value range of the roll-shaped edge entering amount delta of an intermediate roll is [150mm, 200mm ]]According to the value range of delta, the steel strip with the actually produced B being 1060mm can be calculated according to the formula (5), and the control range of the play amount S of the intermediate roll is [90mm, 130mm ] in the first pass of rolling]After the second pass, the control range of a roll play amount S is [90mm, 140mm ]]。
From the angle of industrial tests, the steel silicon with the width of 1060mm and the thickness of a finished product of 0.3mm is produced by adopting the intermediate roll shape and the process with the control range of the intermediate roll play S of 90mm and 140mm in the first pass of rolling and the process with the control range of the intermediate roll play S of 90mm and 140mm in the second pass of rolling, and the ratio of the same plate difference D25 of less than or equal to 5 mu m is increased from 67.53% before the intermediate roll shape is input to 90%, so that the transverse thickness difference is controlled with high precision, and the technical effect of the yield is greatly improved.
One or more technical solutions in the embodiments of the present invention at least have one or more of the following technical effects:
1. the embodiment of the invention provides a method for controlling edge drop of silicon steel produced by a Sendzimir rolling mill, which comprises the following steps: obtaining a middle roller shape curve function; determining an initial radius R of an intermediate roll according to actual equipment parameters of a Sendzimir rolling mill0A middle roll body length L; obtaining the coordinates x of the mark point1And x2(ii) a Determining the roll shape coefficient k1And a, b, c; an intermediate roll profile is determined. The technical problems that in the prior art, the silicon steel edge drop is reduced to a certain extent by the roller shifting of the roller shape of an intermediate roller of the Sendzimir rolling mill, but the expected effect is not achieved, so that the edge drop cannot be effectively controlled, the accuracy of the transverse thickness difference is not high, and the yield is low are solved.
2. The embodiment of the invention specifically comprises the following steps of:
wherein y (x) is a function of the intermediate roll radius in mm; x is a middle roller body coordinate with one end of a middle roller as an end point, and the unit is mm; r0Is an intermediate roll initial radius in mm; k is a radical of1Is roll form factor in mm-1(ii) a a. b and c are roll shape coefficients, and a is in mm-1B is dimensionless and c is in mm; l is the length of a middle roller body, and the unit is mm; x is the number of1And x2Is a mark point coordinate, and the unit is mm, thereby further achieving the technical effect of effectively controlling the edge drop of the silicon steel.
3. In the embodiment of the invention, when the rollers are configured, two upper middle rollers and two lower middle rollers are arranged in a antisymmetric way, and in an initial state, the two upper middle rollers and the two lower middle rollers respectively axially shift in opposite directions; the relationship between the amount of run-out S, the strip width B and the amount of roll-edge entry δ of an intermediate roll is:
wherein, delta is the entering amount of the roller-shaped edge part of the intermediate roller, and the unit is mm; b is the width of the strip steel, and the unit is mm; s0Is an initial movement amount of the intermediate roll, and the unit is mm; s is a middle roller play amount, and the unit is mm; during the first pass of rolling, the value range of the roll-shaped edge entering amount delta of an intermediate roll is [160mm, 200mm ]](ii) a After the second pass, the roll-shaped edge entry delta of an intermediate roll is in the range of [150mm, 200mm ]]. Further realize high accuracy control lateral thickness difference, improved the technological effect of lumber recovery greatly.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to encompass such modifications and variations.
Claims (2)
1. A method for controlling edge drop in silicon steel production using a sendzimir mill, the method comprising:
1) obtaining a middle roller shape curve function, wherein the middle roller shape curve function specifically comprises the following steps:
wherein y (x) is a function of the intermediate roll radius in mm;
x is a middle roller body coordinate with one end of a middle roller as an end point, and the unit is mm;
R0is an intermediate roll initial radius in mm;
k1is roll form factor in mm-1；
a. b and c are roll shape coefficients, and a is in mm-1B is dimensionless and c is in mm;
l is the length of a middle roller body, and the unit is mm;
x1and x2Is the coordinate of a mark point, and the unit is mm;
2) determining an initial radius R of an intermediate roll according to actual equipment parameters of a Sendzimir rolling mill0A middle roll body length L;
3) obtaining the coordinate x of the mark point1And x2Said index point coordinate x1And x2The calculation formula of (2) is as follows:
x1＝0.7L (2)
determining x according to equation (2)1Determining x according to equation (3)2；
4) Determining the roll shape coefficient k1And a, b, c, the roll form factor k1And a, b, c are calculated by the following formula:
wherein d is1As a coordinate x of the index point2The corresponding chamfering depth is in mm;
d is the corresponding chamfering depth of the roll body L;
k1is roll form factor in mm-1；
L is the length of a middle roller body, and the unit is mm;
5) determining the roll shape of an intermediate roll;
6) when the rollers are configured, the two upper middle rollers and the two lower middle rollers are arranged in an anti-symmetric manner, in an initial state, the two upper middle rollers and the two lower middle rollers respectively axially shift in opposite directions, and the relationship between the shift amount S, the strip steel width B and the roll-shaped edge entering amount delta of the middle rollers is as follows:
wherein, delta is the entering amount of the roller-shaped edge part of the intermediate roller, and the unit is mm;
b is the width of the strip steel, and the unit is mm;
S0is an initial movement amount of the intermediate roll, and the unit is mm;
s is the play of a middle roller, and the unit is mm.
2. The method of claim 1, wherein the method further comprises:
during the first pass of rolling, the value range of the roll-shaped edge entering amount delta of an intermediate roll is [160mm, 200mm ];
after the second pass, the roll-shaped edge entry delta of an intermediate roll was found to have a value in the range [150mm, 200mm ].
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