Method for controlling the shape of a high-magnetic-induction oriented silicon steel sheet

Abstract

The present application belongs to the field of strip steel cold rolling, and particularly relates to a twenty-high rolling mill high magnetic induction oriented silicon steel shape control method, which can pre-set the roll system position of the twenty-high rolling mill and improve the shape quality of the last pass strip head. The twenty-high rolling mill high magnetic induction oriented silicon steel shape control method comprises a control method of a middle roll of the twenty-high rolling mill and a control method of an ASU roll, wherein the control method of the middle roll comprises: establishing a position pre-calculation mathematical model of the middle roll, and obtaining the preset position of the middle roll in the last pass according to the position of the middle roll in the previous pass and the rolling pressure pre-calculated in the last pass; and establishing a position pre-calculation mathematical model of the ASU roll in the last pass, and obtaining the total crown value of the ASU roll in the last pass according to the position of the ASU roll in the previous pass.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of strip steel cold rolling, and particularly relates to a method for controlling the shape of high-magnetic-induction oriented silicon steel sheet in a 20-roller rolling mill. BACKGROUND

[0002] High-magnetic-induction oriented silicon steel is a raw material for manufacturing transformer cores, and is generally produced by a 20-roller Sendzimir mill one-time cold rolling process. In order to improve the magnetic properties, the flow of emulsion is controlled to achieve high-temperature aging, which is the most complex and difficult steel grade in the cold rolling process.

[0003] In the rolling process, large reduction ratio rolling and special process rolling of controlling the flow of emulsion are adopted to improve the temperature of the steel sheet, but the last pass is rolled with a relatively small reduction ratio and a large flow of emulsion to ensure the surface quality and the shape quality. Due to the particularity of aging rolling, the process difference between the previous pass and the last pass is large, the difference in the position of the roller system is large, and the thickness is thin. The shape adjustment of the last pass head is difficult, the shape quality is poor, and it brings great difficulty to the completion of the index and the continuous production of the next process (head and tail welding). SUMMARY

[0004] In order to overcome the defects in the above related technologies, the application provides a method for controlling the shape of high-magnetic-induction oriented silicon steel sheet in a 20-roller rolling mill, which can pre-set the position of the roller system of the 20-roller rolling mill to improve the shape quality of the last pass head plate.

[0005] In order to achieve the above technical purpose, the application provides a method for controlling the shape of high-magnetic-induction oriented silicon steel sheet in a 20-roller rolling mill. The method for controlling the shape of high-magnetic-induction oriented silicon steel sheet in a 20-roller rolling mill includes a control method for a middle roller of the 20-roller rolling mill.

[0006] The control method for the middle roller includes: establishing a position pre-calculation mathematical model of the middle roller, and obtaining a preset position of the middle roller corresponding to the last pass according to the position of the middle roller in the previous pass and the rolling pressure pre-calculated in the last pass; the position pre-calculation mathematical model of the middle roller is:

[0007]

[0008] Wherein, L1 is the value of the preset position of the middle roller in the last pass, L2 is the value of the position of the middle roller in the previous pass, a is a constant, P1 is the rolling pressure of the last pass, P2 is the rolling pressure of the previous pass, K is the taper of the middle roller, and ε is the reduction ratio of the last pass.

[0009] Preferably, the twenty-roller mill high-magnetic-induction oriented silicon steel plate shape control method further comprises a control method of the ASU roller. The control method of the ASU roller comprises: establishing a pre-calculation mathematical model of the position of the ASU roller in the last pass, which is:

[0010]

[0011] Wherein: A 总 is a total crown value of the ASU roller, A1 is a position value of No. 1 ASU roller after parking at the tail of the previous pass, A2 is a position value of No. 2 ASU roller after parking at the tail of the previous pass, A6 is a position value of No. 6 ASU roller after parking at the tail of the previous pass, A7 is a position value of No. 7 ASU roller after parking at the tail of the previous pass, and Q is a constant.

[0012] Preferably, the control method of the intermediate roller is set before the twenty-roller mill in the last pass is operated.

[0013] Preferably, the control method of the ASU roller is set before the twenty-roller mill in the last pass is operated.

[0014] Preferably, the constant a has a value range of 20-40.

[0015] Preferably, the constant Q = b / (b1+b2), wherein b is a strip width, b1 is a maximum rolling width of the twenty-roller mill, and b2 is a minimum rolling width of the twenty-roller mill.

[0016] The present application has the following beneficial effects:

[0017] The present application can pre-calculate the positions of the intermediate roller and the ASU roller in the last pass, reduce the length of the strip with a plate shape difference in the last pass, improve the plate shape qualification rate, and improve the overall economic benefits. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the following will briefly introduce the drawings needed to be used in the embodiments or the related art descriptions. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0019] Figure 1 is a structure diagram of the twenty-roller mill of the present application;

[0020] Figure 2 is a structure diagram of the ASU roller of the present application. DETAILED DESCRIPTION

[0021] In order to make the above objectives, characteristics and advantages of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0022] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0023] The terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise stated, the meaning of "multiple" is two or more.

[0024] In the prior art, as shown in Figure 1 The roll system of the twenty-roll mill includes a backup roll 1, an intermediate roll 2, a second intermediate roll 3, and a work roll 4. The roll system of the twenty-roll mill is divided into two groups, each group having 10 rolls, which are respectively a work roll 4, two second intermediate rolls 3, three intermediate rolls 2, and four backup rolls 1. Among them, the backup roll 1 can be arranged on the saddle of the twenty-roll mill through a bearing, and the other rolls are directly arranged between the backup rolls 1 on the upper and lower sides in a direct stacking manner.

[0025] The present application will be described below based on the structure of the twenty-roll mill in the prior art in combination with the embodiments and drawings:

[0026] Some embodiments of the present application provide a twenty-roll mill high-magnetic-induction oriented silicon steel plate shape control method. The twenty-roll mill high-magnetic-induction oriented silicon steel plate shape control method comprises:

[0027] S1, a control method for an intermediate roll of the twenty-roll mill and a control method for an ASU roll.

[0028] In some examples, the positions of the ASU rollers of the twenty-high rolling mill can be pre-calculated before the last pass begins, then the position of the intermediate roller can be pre-calculated, and the ASU roller and the intermediate roller are adjusted to the corresponding positions in advance before the twenty-high rolling mill is operated.

[0029] In some embodiments, the control method of the intermediate roller includes establishing a position pre-calculation mathematical model of the intermediate roller. The control method of the intermediate roller includes: establishing a position pre-calculation mathematical model of the intermediate roller, and obtaining the preset position of the intermediate roller in the last pass according to the position of the intermediate roller in the previous pass and the pre-calculated rolling pressure in the last pass; the position pre-calculation mathematical model of the intermediate roller is:

[0030]

[0031] Wherein, L1 is the value of the preset position of the intermediate roller in the last pass, L2 is the value of the position of the intermediate roller in the previous pass, a is a constant, P1 is the rolling pressure in the last pass, P2 is the rolling pressure in the previous pass, K is the taper of the intermediate roller, and ε is the reduction rate in the last pass.

[0032] In some examples, in the twenty-high rolling mill, there are six intermediate rollers, and the position of each intermediate roller in the last pass of the twenty-high rolling mill is related to the position of the intermediate roller at the corresponding position in the previous pass of the twenty-high rolling mill and the rolling pressure of the strip steel in the current pass (the last pass).

[0033] It can be understood that the position of the intermediate roller in the last pass is related to the position of the corresponding intermediate roller in the previous pass, that is, the position of the intermediate roller in the last pass can be obtained by fine-tuning the position of the corresponding intermediate roller in the previous pass. The fine-tuning range of the position of the intermediate roller in the last pass relative to the position of the corresponding intermediate roller in the previous pass is related to the rolling pressures of the strip steel in the previous pass and the current pass, the reduction rate in the last pass, and the taper of the intermediate roller in the last pass. Specifically, the fine-tuning range is directly proportional to the difference between the rolling pressures in the previous pass and the current pass, that is, the difference between the rolling pressure in the last pass and the rolling pressure in the previous pass is directly proportional to the pressing amplitude of the rolled plate, and the fine-tuning range is directly proportional to the taper of the intermediate roller, that is, the greater the taper of the intermediate roller, the greater the pressing amplitude of the rolled plate. And the fine-tuning range is inversely proportional to the reduction rate ε in the last pass.

[0034] In some embodiments, the value of the constant a ranges from 20 to 40, wherein the constant a is related to the concentration of the emulsion and the roughness of the work roller. Specifically, the greater the concentration of the emulsion, the greater the value of the constant a, and the greater the roughness of the work roller, the greater the value of the constant a.

[0035] In some embodiments, as Figure 2As shown, the twenty-roller mill high-magnetic-induction oriented silicon steel plate shape control method further includes step S2.

[0036] S2, control method of ASU rollers. The control method of the ASU rollers includes: establishing a pre-computed mathematical model of positions of the ASU rollers in the last pass, the pre-computed mathematical model of the positions of the ASU rollers in the last pass being:

[0037]

[0038] wherein A 总 is a total crown value of the ASU rollers, A1 is a position value of the No. 1 ASU roller after parking at the tail of the previous pass, A2 is a position value of the No. 2 ASU roller after parking at the tail of the previous pass, A6 is a position value of the No. 6 ASU roller after parking at the tail of the previous pass, A7 is a position value of the No. 7 ASU roller after parking at the tail of the previous pass, and Q is a constant.

[0039] In some examples, the twenty-roller mill can include 7 ASU rollers: the No. 1 ASU roller, the No. 2 ASU roller, the No. 3 ASU roller, the No. 4 ASU roller, the No. 5 ASU roller, the No. 6 ASU roller, and the No. 7 ASU roller in order from one end to the other end of the self-supporting roller. In order to prevent the strip from being broken due to excessive rolling pressure on both sides of the strip, the positions of the ASU rollers are controlled by the positions of the ASU rollers at both ends of the support roller, that is, the total crown value of the ASU rollers in the last pass is obtained by the No. 1 ASU roller, the No. 2 ASU roller, the No. 6 ASU roller, and the No. 7 ASU roller in the previous pass.

[0040] In some embodiments, the constant Q = b / (b1+b2), wherein b is the width of the strip, b1 is the maximum rolling width of the twenty-roller mill, and b2 is the minimum rolling width of the twenty-roller mill.

[0041] In some embodiments, the control method of the intermediate roller is set before the twenty-roller mill in the last pass is operated.

[0042] In some embodiments, the control method of the ASU roller is set before the twenty-roller mill in the last pass is operated.

[0043] For example, before the twenty-roller mill in the last pass is operated, the pre-computed positions of the intermediate roller and the pre-computed positions of the ASU rollers obtained can be input into the twenty-roller mill, and the twenty-roller mill can control the corresponding rollers to the corresponding positions in advance according to the set parameters. Alternatively, the calculation formula in the above embodiments can be written into the control system of the twenty-roller mill in the form of a program, and before the twenty-roller mill in the last pass is operated, the control system can obtain the corresponding parameters and calculate the corresponding positions of the corresponding rollers by itself, and adjust the corresponding rollers to the corresponding positions before the twenty-roller mill in the last pass starts operation.

[0044] In the description of the present specification, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in an appropriate manner.

[0045] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method of shape control of high magnetic induction oriented silicon steel sheet for a twenty-high rolling mill, the twenty-high rolling mill being a twenty-high Sendzimir mill, characterized by, The twenty-roller mill high-magnetic-susceptibility oriented silicon steel plate shape control method comprises a control method for an intermediate roller of the twenty-roller mill. The control method for the intermediate roller comprises: A position pre-calculation mathematical model of the intermediate roller is established, and a preset position of the intermediate roller in the last pass is obtained according to a position of the intermediate roller in a previous pass and a pre-calculated rolling pressure in the last pass; the position pre-calculation mathematical model of the intermediate roller is: ； wherein L1 is a value of the preset position of the intermediate roller in the last pass, L2 is a value of the position of the intermediate roller in the previous pass, a is a constant, P1 is the rolling pressure in the last pass, P2 is the rolling pressure in the previous pass, K is a conicity of the intermediate roller, and ε is a reduction rate in the last pass.

2. The twenty-roller high-magnetic-induction oriented silicon steel sheet shape control method according to claim 1, characterized by, An end of the support roller to another end is sequentially a No. 1 ASU roller, a No. 2 ASU roller, a No. 3 ASU roller, a No. 4 ASU roller, a No. 5 ASU roller, a No. 6 ASU roller, and a No. 7 ASU roller. The twenty-roller mill high-magnetic-susceptibility oriented silicon steel plate shape control method further comprises a control method for the ASU roller. The control method for the ASU roller comprises: A position pre-calculation mathematical model of the ASU roller in the last pass is established, and the position pre-calculation mathematical model of the ASU roller in the last pass is: ； wherein: A 总 A is the total crown value of the ASU rolls, A1 is the position value of No. 1 ASU roll after the tail end of the previous pass stops, A2 is the position value of No. 2 ASU roll after the tail end of the previous pass stops, A6 is the position value of No. 6 ASU roll after the tail end of the previous pass stops, A7 is the position value of No. 7 ASU roll after the tail end of the previous pass stops, and Q is a constant.

3. The twenty-roller high-magnetic-induction oriented silicon steel sheet shape control method according to claim 1 or 2, characterized by, The control method for the intermediate roller is set before the twenty-roller mill in the last pass is operated.

4. The twenty-roller high-magnetic-induction oriented silicon steel sheet shape control method according to claim 2, characterized by, The control method for the ASU roller is set before the twenty-roller mill in the last pass is operated.

5. The twenty-roller high-magnetic-induction oriented silicon steel sheet shape control method according to claim 3, characterized by, The constant a has a value range of 20-40.

6. The twenty-roller high-magnetic-induction oriented silicon steel sheet shape control method according to claim 4, characterized by, The constant Q is b / (b1+b2), wherein b is a strip width, b1 is a maximum rolling width of the twenty-roller mill, and b2 is a minimum rolling width of the twenty-roller mill.

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