A method for determining the wear of the rollers in the skin-pass mill

Abstract

The present invention relates to a method for determining the wear of the rollers of a leveling mill, and belongs to the technical field of hot rolling methods in the metallurgical industry. The technical solution of the present invention is: determining the length and number of the divided intervals of the rollers along the axial direction; after determining whether the rolling mill has changed rollers, obtaining the initial accumulated wear of each position on the axial direction of the rollers; after the rolling mill has cast steel, obtaining process parameter information to construct a roller wear model, and calculating the wear amount of each position on the axial direction of the rollers; obtaining the initial accumulated wear of each position on the axial direction of the rollers, calculating the current accumulated wear of each position on the axial direction of the rollers and storing it, waiting for the next roller change or mill casting. The beneficial effects of the present invention are: effectively improving the strip shape control level of the leveling and coiling production line, accurately calculating the roller wear at any time, providing conditions for the accuracy of the roller gap setting and bending roll force setting of the leveling and coiling production line, etc., with wide practicality and broad application prospects.

Description

Technical Field

[0001] The invention relates to a method for determining the wear of a skin-pass mill roll, and belongs to the technical field of hot rolling methods in the metallurgical industry. Background Art

[0002] The hot-rolling technology sector holds a significant market potential for hot-rolled thin-gauge strip. During the production process, whether using conventional hot-rolling mills or CSP mills, varying degrees of flatness defects are present after rolling, necessitating a flattening process before shipment to ensure the flatness quality of the finished product. Roller profile and roll gap shape are fundamental to flatness control. However, existing technologies often fail to consider roll wear and its impact on flatness control during flattening production and shape model setting. This results in unreasonable pre-settings for flattening roll bending forces due to roll wear in the later stages of production, necessitating continuous adjustment of the bending force during production to meet the flatness control requirements of hot-rolled thin-gauge strip. Summary of the Invention

[0003] The purpose of the present invention is to provide a method for determining the wear of the rollers of a leveling mill. By constructing a roller wear model, determining the wear range and calculating the wear amount at each position in the wear range, the current accumulated wear of the rollers is further calculated, thereby effectively improving the strip shape control level of the leveling and coiling production line. The roller wear at any moment can be accurately calculated, providing conditions for the accuracy of the roller gap setting and the bending roller force setting of the leveling and coiling production line. The method has wide practicality and broad application prospects, and effectively solves the above-mentioned problems existing in the background technology.

[0004] The technical solution of the present invention is: a method for determining the wear of the rollers of a skin-pass mill, comprising the following steps:

[0005] S101, determining the length and number of the divided sections of the roller along the axial direction;

[0006] S102, after determining whether the rolling mill has changed rolls, if so, initialize the accumulated wear of each position on the roll axis to zero; otherwise, do nothing;

[0007] S103, after the rolling mill finishes rolling, obtain process parameter information and calculate the roll wear at each position along the roll axis;

[0008] S104, obtaining the initial accumulated wear of each position on the roller axis, calculating the current accumulated wear of each position on the roller axis and storing it, waiting for the next roll change or mill throwing.

[0009] In step S101, the length of the roller in the axial direction is L, and the roller is evenly divided into N intervals in the axial direction, with a total of N+1 positions from the beginning to the end. The position set is recorded as S, S = {S0, S1, S2, ..., S i ,…,SN}, i∈{0,1,2,…,N}, each interval is recorded as a Segment, so the length of each Segment N is determined based on the axial length L of the roller. The principle of determination is to ensure the length L of each segment seg ∈[10mm, 30mm].

[0010] In step S102, the accumulated wear is recorded as a set Wt, Wt = {Wt0, Wt1, Wt2, ..., Wt i ,…,Wt N}, i∈{0,1,2,…,N}, Wt i is the accumulated wear at position Si;

[0011] When the rolling mill is judged to have changed rolls, the accumulated wear set Wt is initialized to 0, that is, Wt i =0, otherwise no operation is performed on the accumulated wear set Wt.

[0012] In step S103, the process parameter information includes the roll wear rate V, the strip width W, the rolling force F, the roll load revolutions R and the rolling oil correction coefficient C;

[0013] Among them, the wear corresponding to the set S is Wear, Wear={Wear0, Wear1, Wear2,…, Wear i ,…,Wear N}, i∈{0,1,2,…,N}, Wear i is the calculated wear at position Si;

[0014] The wear range S' in the axial direction of the roll is calculated based on the strip width. When , Si belongs to the wear range, that is, the wear range is the part where the roll contacts the strip, and the Si wear amount at each position is calculated within the wear range;

[0015] Calculate the wear amount Wear at the corresponding position of the roller,

[0016]

[0017] Wherein, C is the rolling oil correction coefficient. When rolling oil is added, C∈[0.6,1.0], otherwise when rolling oil is not added, C=1.0;

[0018] V is the roller wear rate, which is set according to the roller material;

[0019] F is the rolling force when the strip passes through the rolling mill, the unit is KN;

[0020] W is the strip width, in mm;

[0021] R is the number of revolutions of the roller under load;

[0022] The wear at each position in the axial direction of the roller is recorded as Wear i ,

[0023]

[0024] In step S104, the current accumulated wear of each position on the roller axis is calculated, including the current accumulated wear Wt i = Initial accumulated wear Wt i +Wear i ;

[0025] The initial cumulative wear of the roller Wt is obtained from the database, Wt={Wt0, Wt1, Wt2,…, Wt i ,…,Wt N}, i∈{0,1,2,…,N}.

[0026] The current accumulated wear of the roller is stored in the database and used as the original accumulated wear for the next time.

[0027] The beneficial effects of the present invention are: by constructing a roller wear model, determining the wear range and calculating the wear amount at each position in the wear range, and further calculating the current accumulated wear of the roller, the strip shape control level of the flattening and coiling production line is effectively improved, and the roller wear at any time can be accurately calculated, which provides conditions for the accuracy of roller gap setting and bending roller force setting of the flattening and coiling production line, etc., and has wide practicality and broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a flow chart of the method of the present invention;

[0029] Figure 2 1 is a graph showing the calculated values ​​of roller wear according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the invention implementation cases clearer, the technical solutions in the invention implementation cases will be clearly and completely described below in conjunction with the drawings in the implementation cases. Obviously, the implementation cases described are only a small part of the implementation cases of the present invention, rather than all the implementation cases. Based on the implementation cases in the present invention, all other implementation cases obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] A method for determining the wear of a skin-pass mill roll comprises the following steps:

[0032] S101, determining the length and number of the divided sections of the roller along the axial direction;

[0033] S102, after determining whether the rolling mill has changed rolls, if so, initialize the accumulated wear of each position on the roll axis to zero; otherwise, do nothing;

[0034] S103, after the rolling mill finishes rolling, obtain process parameter information and calculate the roll wear at each position along the roll axis;

[0035] S104, obtaining the initial accumulated wear of each position on the roller axis, calculating the current accumulated wear of each position on the roller axis and storing it, waiting for the next roll change or mill throwing.

[0036] In step S101, the length of the roller in the axial direction is L, and the roller is evenly divided into N intervals in the axial direction, with a total of N+1 positions from the beginning to the end. The position set is recorded as S, S = {S0, S1, S2, ..., S i ,…,S N}, i∈{0,1,2,…,N}, each interval is recorded as a Segment, so the length of each Segment N is determined based on the axial length L of the roller. The principle of determination is to ensure the length L of each segment seg ∈[10mm, 30mm].

[0037] In step S102, the accumulated wear is recorded as a set Wt, Wt = {Wt0, Wt1, Wt2, ..., Wt i ,…,Wt N}, i∈{0,1,2,…,N}, Wt i is the accumulated wear at position Si;

[0038] When the rolling mill is judged to have changed rolls, the accumulated wear set Wt is initialized to 0, that is, Wt i =0, otherwise no operation is performed on the accumulated wear set Wt.

[0039] In step S103, the process parameter information includes the roll wear rate V, the strip width W, the rolling force F, the roll load revolutions R and the rolling oil correction coefficient C;

[0040] Among them, the wear corresponding to the set S is Wear, Wear={Wear0, Wear1, Wear2,…, Wear i ,…,Wear N}, i∈{0,1,2,…,N}, Wear i is the calculated wear at position Si;

[0041] The wear range S' in the axial direction of the roll is calculated based on the strip width. When , Si belongs to the wear range, that is, the wear range is the part where the roll contacts the strip, and the Si wear amount at each position is calculated within the wear range;

[0042] Calculate the wear amount Wear at the corresponding position of the roller,

[0043]

[0044] Wherein, C is the rolling oil correction coefficient. When rolling oil is added, C∈[0.6,1.0], otherwise when rolling oil is not added, C=1.0;

[0045] V is the roller wear rate, which is set according to the roller material;

[0046] F is the rolling force when the strip passes through the rolling mill, the unit is KN;

[0047] W is the strip width, in mm;

[0048] R is the number of revolutions of the roller under load;

[0049] The wear at each position in the axial direction of the roller is recorded as Wear i ,

[0050]

[0051] In step S104, the current accumulated wear of each position on the roller axis is calculated, including the current accumulated wear Wt i = Initial accumulated wear Wt i +Wear i ;

[0052] The initial cumulative wear of the roller Wt is obtained from the database, Wt={Wt0, Wt1, Wt2,…, Wt i ,…,Wt N}, i∈{0,1,2,…,N}.

[0053] The current accumulated wear of the roller is stored in the database and used as the original accumulated wear for the next time.

[0054] In practical applications, the present invention comprises the following steps:

[0055] S101. Determine the length and number of divided sections of the roller along the axial direction.

[0056] The length of the roller in the axial direction is L, and the roller is evenly divided into N intervals along the axial direction, with a total of N+1 positions from the beginning to the end. The position set is recorded as S, S = {S0, S1, S2, ..., Si ,…,S N}, i∈{0,1,2,…,N}, each interval is recorded as a Segment, so the length of each Segment

[0057] Furthermore, N is determined based on the axial length L of the roller. The principle of determination is to ensure that the length L of each segment seg ∈[10mm, 30mm];

[0058] S102: After determining whether the rolling mill has changed rolls, if so, initialize the accumulated wear of each position on the roll axis to zero; otherwise, do nothing.

[0059] The accumulated wear is recorded as a set Wt, Wt = {Wt0, Wt1, Wt2, ..., Wt i ,…,Wt N}, i∈{0,1,2,…,N}, Wt i is the accumulated wear at position Si.

[0060] When the rolling mill is judged to have changed rolls, the accumulated wear set Wt is initialized to 0, that is, Wt i =0, otherwise no operation is performed on the accumulated wear set Wt.

[0061] S103: After the rolling mill finishes rolling, process parameter information is obtained, and the wear amount of the roll at each position on the roll axis is calculated.

[0062] The process parameter information includes the roll wear rate V, the strip width W, the rolling force F, the roll load revolutions R, and the rolling oil correction coefficient C;

[0063] Furthermore, the wear corresponding to the set S is Wear, Wear = {Wear0, Wear1, Wear2, ..., Wear i ,…,Wear N}, i∈{0,1,2,…,N}, Wear i is the calculated wear at position Si.

[0064] Furthermore, the wear range S' in the axial direction of the roll is calculated according to the strip width. When , Si belongs to the wear range, that is, the wear range is the part where the roll contacts the strip, and the Si wear amount at each position is calculated within the wear range.

[0065] Furthermore, the wear amount Wear at the corresponding position of the roller is calculated.

[0066]

[0067] Wherein, C is the rolling oil correction coefficient. When rolling oil is added, C∈[0.6,1.0], otherwise when rolling oil is not added, C=1.0;

[0068] V is the roll wear rate, which is set according to the roll material and includes:

[0069] Roller material <![CDATA[Wear rate V (mm 2 / KN)]]> Cr5 forged steel 9.15835E-7 high chromium cast iron 8.140E-7 Infinitely chilled cast iron 8.140E-7 High-speed steel roller 1.200E-7；

[0070] F is the rolling force when the strip passes through the rolling mill, the unit is KN;

[0071] W is the strip width, in mm;

[0072] R is the number of revolutions of the roller under load.

[0073] Furthermore, for the wear at each position in the axial direction of the roll i ,

[0074]

[0075] S104, obtaining the initial accumulated wear of each position on the roller axis, updating the accumulated wear of each position on the roller axis and storing it, waiting for the next roll change or mill throwing.

[0076] The initial cumulative wear of each position of the roller is obtained from the database, and Wt={Wt0, Wt1, Wt2, ..., Wt i ,…,Wt N}, i∈{0,1,2,…,N};

[0077] Furthermore, when each strip is completed in the rolling mill, the roll wear Wear is calculated and the current accumulated wear Wt is updated. i = Initial accumulated wear Wt i +Wear i ;

[0078] Furthermore, the current cumulative wear of the roller Wt is stored in the database and used as the original cumulative wear for the next time.

[0079] The present invention determines the length and number of intervals of the roller in the axial direction, and determines the optimal interval length range; after determining whether the rolling mill has changed rollers, the cumulative initial wear of each position on the roller axis is obtained; after the rolling mill has cast steel, the rolling force, strip width, roller load revolutions, and roller material are obtained to construct a roller wear model, and the wear interval in the axial direction of the roller is calculated according to the strip width, and the wear amount at each position in the wear interval is calculated; by obtaining the initial cumulative wear of the roller from the database, the current cumulative wear of the roller is calculated, and stored in the database for use as the original cumulative wear for the next time, and also serves as the basis for setting the roller gap and bending roller force of the flattening and coiling production line, effectively improving the strip shape control level of the flattening and coiling production line.

[0080] The present invention can accurately calculate the roller wear at any time, providing conditions for the accuracy of roller gap setting and bending roller force setting of the flattening and coiling production line, effectively improving the strip shape control level and product quality of the flattening and coiling production line, and has wide practicality and broad application prospects.

[0081] Example:

[0082] In a certain flattening and coiling production line, the axial length of the roller is L = 2100 mm. The roller is evenly divided into 84 intervals along the axial direction, that is, N = 84, and the position set S = {S0, S1, S2, ..., S i ,…,S 84}, i∈{0,1,2,…,84}, each interval is recorded as a Segment, so the length of each Segment is When the rolling mill rolls are changed, the accumulated wear set Wt is initialized to 0, that is, Wt i =0;

[0083] After the rolling mill is finished, process parameter information is obtained and the roll wear at each position on the roll axis is calculated. The current roll material is Cr5 forged steel, and the roll wear rate V = 9.15835E-7mm 2 / KN, strip width W = 1300mm, rolling force F = 2433KN, roll load revolutions R = 779.64, rolling oil is used, so the rolling oil correction coefficient C = 1.0;

[0084] The wear range S' in the axial direction of the roll is calculated based on the strip width. When Si belongs to the wear range, Therefore, when i∈[16, 68], S18~S68 belong to the wear range.

[0085] Calculate the wear of the roller wear range i ;

[0086]

[0087] Therefore, for i∈[16, 68],

[0088]

[0089] For i∈[0,16) or i∈(68,84], Wear i =0;

[0090] Furthermore, the cumulative wear of the roller is calculated, and the current cumulative wear Wt i = Initial accumulated wear Wt i +Wear i ,

[0091] The initial accumulated wear Wt obtained is 0, that is, Wt i =0,i∈[0,84];

[0092] Therefore, the current accumulated wear is:

[0093] When the position number i∈[16, 68], the current accumulated wear Wt i = Initial accumulated wear Wt i +Wear i =0mm+0.001347mm=0.001347mm;

[0094] When the position number i∈[0,16) or i∈(68,84], the current accumulated wear Wt i = Initial accumulated wear Wt i +Wear i =0mm+0mm=0mm;

[0095] Use the table to express it as:

[0096]

[0097]

[0098]

[0099]

[0100] The calculated current cumulative wear of the roll Wt is stored in the database and used as the initial cumulative wear in the next calculation.

[0101] Waiting for the next roll change or mill throwing.

[0102] When the second strip is in the rolling mill after the mill throws out the steel, the process parameter information is obtained and the roll wear amount in each divided interval is calculated.

[0103] The current roller material is Cr5 forged steel, and the roller wear rate V = 9.15835E-7mm 2 / KN, strip width W = 1200mm, rolling force F = 2145KN, roll load revolutions R = 772.4, rolling oil is used, so the rolling oil correction coefficient C = 1.0;

[0104] The wear range s′ in the axial direction of the roll is calculated based on the strip width. When S i Belongs to the wear range, Therefore, when i∈[18, 66], that is, S 18 ~S 66 Belongs to the wear range.

[0105] Calculate the wear of the roller wear range i ;

[0106]

[0107] Therefore, for i∈[18, 66],

[0108]

[0109] For i∈[0,18) or i∈(66,84], Wear i =0;

[0110] Furthermore, the cumulative wear of the roller is calculated, and the current cumulative wear Wt i = Initial accumulated wear Wt i +Wear i ,

[0111] The initial accumulated wear obtained includes:

[0112] When the position number i∈[16,68], Wt i =0.001347mm;

[0113] When the position number i∈[0,16) or i∈(68,84], Wt i =0mm;

[0114] Therefore, the current accumulated wear is:

[0115] When the position number i∈[0,16) or i∈(68,84], the current accumulated wear Wt i = Initial accumulated wear Wt i +Wear i =0mm+0mm=0mm;

[0116] When the position number i∈[16, 18] or i∈(66, 68], the current accumulated wear Wt i = Initial accumulated wear Wt i +Wear i =0.001347mm+0mm=0.001347mm;

[0117] When the position number i∈[18,66], the current accumulated wear Wt i = Initial accumulated wear Wt i +Wear i =0.001347mm+0.001264mm=0.002611mm;

[0118] Use the table to express it as:

[0119]

[0120]

[0121]

[0122]

[0123] The calculated current cumulative wear of the roll Wt is stored in the database and used as the initial cumulative wear in the next calculation.

[0124] Waiting for the next roll change or mill throwing.

[0125] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

[0126] The above describes the preferred embodiments of the present invention. It should be pointed out that the present invention is not limited to the above-mentioned specific embodiments, and the devices and structures not described in detail should be understood to be implemented in a common manner in the art; any simple modifications, equivalent changes and modifications made to the above embodiments by any technician familiar with the art based on the technical essence of the present invention without departing from the scope of the technical solution of the present invention are still within the scope of protection of the technical solution of the present invention.

Claims

1. A method for determining the wear of the rollers of a skin-pass mill, characterized in that The following steps are involved: S101, determining the length and number of the divided sections of the roller along the axial direction; S102, after determining whether the rolling mill has changed rolls, if so, initialize the accumulated wear of each position on the roll axis to zero; otherwise, do nothing; S103, after the rolling mill finishes rolling, obtain process parameter information and calculate the roll wear at each position along the roll axis; S104, obtaining the initial accumulated wear of each position on the roller axis, calculating the current accumulated wear of each position on the roller axis and storing it, waiting for the next roll change or mill throwing; In step S101, the length of the roller in the axial direction is L, and the roller is evenly divided into N intervals in the axial direction, with a total of N+1 positions from the beginning to the end. The position set is recorded as S, S = {S0, S1, S2, ..., S i ,…,S N }, i∈{0,1,2,…,N}, each interval is recorded as a Segment, so the length of each Segment ; N is determined based on the axial length L of the roller. The principle of determination is to ensure the length L of each segment seg ∈[10mm, 30mm]; In step S103, the process parameter information includes the roll wear rate V, the strip width W, the rolling force F, the roll load revolutions R and the rolling oil correction coefficient C; Among them, the wear corresponding to the set S is Wear, Wear={Wear0, Wear1, Wear2,…, Wear i ,…,Wear N }, i∈{0,1,2,…,N}, Wear i is the calculated wear at position Si; The wear range S' in the axial direction of the roll is calculated based on the strip width. When , Si belongs to the wear range, that is, the wear range is the part where the roll contacts the strip, and the wear amount of Si at each position is calculated within the wear range; Calculate the wear amount Wear at the corresponding position of the roller, ， Wherein, C is the rolling oil correction coefficient. When rolling oil is added, C∈[0.6,1.0], and when rolling oil is not added, C=1.0; V is the roller wear rate, which is set according to the roller material; F is the rolling force, unit is KN; W is the strip width, in mm; R is the number of revolutions of the roller under load; The calculated wear of each position Si in the axial direction of the roll is recorded as Wear i , 。 2. The method for determining the wear of the skin-pass mill roll according to claim 1, characterized in that: In step S102, the accumulated wear is recorded as a set Wt, Wt = {Wt0, Wt1, Wt2, ..., Wt i ,…,Wt N }, i∈{0,1,2,…,N}, Wt i is the accumulated wear at position Si; When the rolling mill is judged to have changed rolls, the accumulated wear set Wt is initialized to 0, that is, Wt i =0, otherwise no operation is performed on the accumulated wear set Wt.

3. The method for determining the wear of the skin-pass mill roll according to claim 2, characterized in that: In step S104, the current accumulated wear of each position on the roller axis is calculated, including the current accumulated wear Wt i = Initial accumulated wear Wt i +Wear i ; The initial cumulative wear of the roller Wt is obtained from the database, Wt={Wt0, Wt1, Wt2,…, Wt i ,…,Wt N }, i∈{0,1,2,…,N}.

4. The method for determining the wear of the skin-pass mill roll according to claim 3, characterized in that: The current cumulative wear of the roller is stored in the database and used as the initial cumulative wear for the next time.

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