阅读说明：本技术 设定矫直机压下量的方法 (Method for setting rolling reduction of straightener ) 是由 陈驰 梁勋国 于 2021-09-24 设计创作，主要内容包括：本发明提供的一种设定矫直机压下量的方法,包括以下步骤：S1.初始化矫直机压下量的工艺参数；S2.确定计算区间以及迭代步长；S3.基于步骤S2确定的计算区间和迭代步长计算上首辊的最优压下量；S4.基于上首辊的最优压下量确定各上辊的压下量。通过上述方法,能够准确确定出矫直机的上辊的最优压下量,而且能够有效提高计算效率,并且计算时间短,响应快,适用于各种工况环境。(The invention provides a method for setting the rolling reduction of a straightener, which comprises the following steps: s1, initializing technological parameters of the reduction of a straightener; s2, determining a calculation interval and an iteration step length; s3, calculating the optimal rolling reduction of the upper roller based on the calculation interval and the iteration step length determined in the step S2; and S4, determining the rolling reduction of each upper roller based on the optimal rolling reduction of the upper first roller. By the method, the optimal rolling reduction of the upper roller of the straightener can be accurately determined, the calculation efficiency can be effectively improved, the calculation time is short, the response is fast, and the method is suitable for various working conditions.)

1. A method for setting the rolling reduction of a straightener is characterized in that: the method comprises the following steps:

s1, initializing technological parameters of the reduction of a straightener;

s2, determining a calculation interval and an iteration step length;

s3, calculating the optimal rolling reduction of the upper roller based on the calculation interval and the iteration step length determined in the step S2;

and S4, determining the rolling reduction of each upper roller based on the optimal rolling reduction of the upper first roller.

2. The method of setting the draft of a leveler as set forth in claim 1 wherein: in step S4, the rolling reduction of each upper roller is determined according to the following method:

wherein d is_kIs the reduction of the kth upper roll, d₁For optimum reduction of the top roll, d_nThe reduction of the final roll is denoted by k as 1,2, …, n.

3. The method of setting the draft of a leveler as set forth in claim 1 wherein: in step S3, the optimum rolling reduction of the top roller is determined by:

S3A1, calculating the current reduction of each upper roller;

S3A2, solving the outlet residual curvature radius of the strip steel under the current upper roller reduction by adopting a curvature integration method, and storing the outlet residual curvature radius and the index of the upper roller reduction;

S3A3, judging whether the current first roller reaches the maximum value in the calculation interval, if so, turning to the step S3A 4; if not, increasing the rolling reduction of the first roller by an iteration step length until the rolling reduction of the first roller reaches the maximum value in the calculation interval, and then turning to the step S3A 4;

and S3A4, finding out the maximum absolute value of the residual curvature radius of the outlet, and determining the optimal rolling reduction of the upper first roller according to the index of the upper roller rolling reduction corresponding to the maximum absolute value of the residual curvature radius of the outlet.

4. The method of setting the draft of a leveler as set forth in claim 1 wherein: in step S3, the optimum rolling reduction of the top roller is determined by:

S3B1, calculating the current reduction of each upper roller;

S3B2, solving the outlet residual curvature radius of the strip steel under the current upper roller reduction by adopting a curvature integration method, and storing the outlet residual curvature radius and the index of the upper roller reduction;

S3B3, judging whether the values of the current outlet residual curvature radius and the outlet residual curvature radius calculated in the previous time are different in sign, if so, entering the step S3B 4;

S3B4, determining the optimal first roller reduction:

wherein d is₁For the optimal reduction of the top roll, deltad is the iteration step,the last roll depression amount calculated for the previous time.

5. The method of setting the draft of a leveler as set forth in claim 1 wherein: in step S1, the process parameters include the initial reduction of the last roller and the initial reduction of the first roller.

6. The method of setting the reduction of a leveler as set forth in claim 5, wherein: determining a calculation interval according to the following method:

s21, taking the initialization parameter of the top roller as a left end point of a calculation interval;

s22, calculating the curvature radius of an outlet of the strip steel, and determining a curve of the residual curvature radius of the outlet of the strip steel changing along with the rolling amount of the top roll according to the curvature radius of the outlet of the strip steel;

s23, determining the maximum value of the allowable rolling reduction of the upper first roller, and searching each peak point of a curve of which the residual curvature radius of the strip steel outlet changes along with the allowable rolling reduction of the upper first roller in the range of the maximum value of the allowable rolling reduction of the upper first roller;

s24, calculating the flatness of the strip steel under the residual curvature radius corresponding to each peak point, and finding out the rolling reduction of the upper first roller corresponding to the minimum value of the flatness as the right end point of the calculation interval.

7. The method of setting the reduction of a leveler as set forth in claim 6, wherein: calculating the flatness of the strip steel according to the following formula:

wherein ft is the flatness of the strip steel, R is the residual curvature radius of the strip steel outlet, and A is the length of the target section of the strip steel.

Technical Field

The invention relates to the technical field of plate straightening, in particular to a method for setting the rolling reduction of a straightening machine.

Background

At present, the setting theory of the rolling reduction of the straightening machine mainly comprises two methods, namely a curvature integration method and a traditional material mechanics method based on a simply supported beam. The curvature integration method is closer to the actual situation by establishing a model by utilizing the contact angle and the reverse curvature. However, solving the optimal rolling reduction according to the curvature integration method requires solving nonlinear programming, and the calculation method is complex and has long calculation time, which is not beneficial to industrial automation control.

In order to solve the above technical problems, a new technical means is needed.

Disclosure of Invention

In view of the above, the invention aims to provide a method for setting the rolling reduction of a straightener, which can accurately determine the optimal rolling reduction of an upper roller of the straightener, can effectively improve the calculation efficiency, has short calculation time and quick response, and is suitable for various working conditions.

The invention provides a method for setting the rolling reduction of a straightener, which comprises the following steps:

s1, initializing technological parameters of the reduction of a straightener;

s2, determining a calculation interval and an iteration step length;

s3, calculating the optimal rolling reduction of the upper roller based on the calculation interval and the iteration step length determined in the step S2;

and S4, determining the rolling reduction of each upper roller based on the optimal rolling reduction of the upper first roller.

Further, in step S4, the rolling reduction of each upper roller is determined according to the following method:

wherein d is_kIs the reduction of the kth upper roll, d₁For optimum reduction of the top roll, d_nThe reduction of the final roll is denoted by k ═ 1,2,. cndot.n.

Further, in step S3, the optimum rolling reduction of the top roller is determined by:

S3A1, calculating the current reduction of each upper roller;

S3A2, solving the outlet residual curvature radius of the strip steel under the current upper roller reduction by adopting a curvature integration method, and storing the outlet residual curvature radius and the index of the upper roller reduction;

S3A3, judging whether the current first roller reaches the maximum value in the calculation interval, if so, turning to the step S3A 4; if not, increasing the rolling reduction of the first roller by an iteration step length until the rolling reduction of the first roller reaches the maximum value in the calculation interval, and then turning to the step S3A 4;

and S3A4, finding out the maximum absolute value of the residual curvature radius of the outlet, and determining the optimal rolling reduction of the upper first roller according to the index of the upper roller rolling reduction corresponding to the maximum absolute value of the residual curvature radius of the outlet.

Further, in step S3, the optimum rolling reduction of the top roller is determined by:

S3B1, calculating the current reduction of each upper roller;

S3B2, solving the outlet residual curvature radius of the strip steel under the current upper roller reduction by adopting a curvature integration method, and storing the outlet residual curvature radius and the index of the upper roller reduction;

S3B3, judging whether the values of the current outlet residual curvature radius and the outlet residual curvature radius calculated in the previous time are different in sign, if so, entering the step S3B 4;

S3B4, determining the optimal first roller reduction:

wherein d is₁For the optimal reduction of the top roll, deltad is the iteration step,the last roll depression amount calculated for the previous time.

Further, in step S1, the process parameters include the initial reduction of the last roller and the initial reduction of the first roller.

Further, the calculation interval is determined according to the following method:

s21, taking the initialization parameter of the top roller as a left end point of a calculation interval;

s22, calculating the curvature radius of an outlet of the strip steel, and determining a curve of the residual curvature radius of the outlet of the strip steel changing along with the rolling amount of the top roll according to the curvature radius of the outlet of the strip steel;

s23, determining the maximum value of the allowable rolling reduction of the upper first roller, and searching each peak point of a curve of which the residual curvature radius of the strip steel outlet changes along with the allowable rolling reduction of the upper first roller in the range of the maximum value of the allowable rolling reduction of the upper first roller;

s24, calculating the flatness of the strip steel under the residual curvature radius corresponding to each peak point, and finding out the rolling reduction of the upper first roller corresponding to the minimum value of the flatness as the right end point of the calculation interval.

Further, the flatness of the strip steel is calculated according to the following formula:

wherein ft is the flatness of the strip steel, R is the residual curvature radius of the strip steel outlet, and A is the length of the target section of the strip steel.

The invention has the beneficial effects that: according to the invention, the optimal rolling reduction of the upper roller of the straightener can be accurately determined, the calculation efficiency can be effectively improved, the calculation time is short, the response is fast, and the method is suitable for various working condition environments.

Drawings

The invention is further described below with reference to the following figures and examples:

FIG. 1 is a flow chart of the present invention.

FIG. 2 is a graph showing the variation of the exit radius of curvature with the thickness of 4mm in accordance with the amount of the top roll pressing in the embodiment of the present invention at a strength of 400 MPa.

FIG. 3 is a graph showing the variation of the exit radius of curvature with the upper first roll pressing amount in the case of the steel strip of the present invention having a strength of 600MPa and a thickness of 4 mm.

FIG. 4 is a graph showing the variation of the exit radius of curvature with the upper first roll pressing amount in the case of the steel strip of the present invention having a strength of 850MPa and a thickness of 4 mm.

FIG. 5 is a graph showing the variation of the exit radius of curvature with the upper first roll pressing amount in the case of the steel strip of the present invention having a strength of 600MPa and a thickness of 2 mm.

FIG. 6 is a graph showing the variation of the exit radius of curvature with the upper first roll pressing amount in the case of the steel strip of the present invention having a strength of 600MPa and a thickness of 6 mm.

Detailed Description

The invention is described in further detail below with reference to the drawings of the specification:

the invention provides a method for setting the rolling reduction of a straightener, which comprises the following steps:

s1, initializing technological parameters of the reduction of a straightener; wherein the process parameters comprise the initial rolling reduction of the last roller and the initial rolling reduction of the first roller;

s2, determining a calculation interval and an iteration step length;

s3, calculating the optimal rolling reduction of the upper roller based on the calculation interval and the iteration step length determined in the step S2;

and S4, determining the rolling reduction of each upper roller based on the optimal rolling reduction of the upper first roller. By the method, the optimal rolling reduction of the upper roller of the straightener can be accurately determined, the calculation efficiency can be effectively improved, the calculation time is short, the response is fast, and the method is suitable for various working conditions.

In this embodiment, in step S4, the rolling reduction of each upper roller is determined according to the following method:

wherein d is_kIs the reduction of the kth upper roll, d₁For optimum reduction of the top roll, d_nThe reduction of the top roll is represented by k 1,2, ·, n, and when k is 1, the reduction of the top roll is represented. By the method, the optimal rolling reduction of each upper roller can be accurately determined.

Wherein, the optimal rolling reduction of the first roller is determined by the following two methods:

the method comprises the following steps: in step S3, the optimum rolling reduction of the top roller is determined by:

S3A1, calculating the current reduction of each upper roller;

S3A2, solving the outlet residual curvature radius of the strip steel under the current upper roller reduction by adopting a curvature integration method, and storing the outlet residual curvature radius and the index of the upper roller reduction;

S3A3, judging whether the current first roller reaches the maximum value in the calculation interval, if so, turning to the step S3A 4; if not, increasing the rolling reduction of the first roller by an iteration step length until the rolling reduction of the first roller reaches the maximum value in the calculation interval, and then turning to the step S3A 4;

and S3A4, finding out the maximum absolute value of the residual curvature radius of the outlet, and determining the optimal rolling reduction of the upper first roller according to the index of the upper roller rolling reduction corresponding to the maximum absolute value of the residual curvature radius of the outlet.

The second method comprises the following steps: in step S3, the optimum rolling reduction of the top roller is determined by:

S3B1, calculating the current reduction of each upper roller;

S3B2, solving the outlet residual curvature radius of the strip steel under the current upper roller reduction by adopting a curvature integration method, and storing the outlet residual curvature radius and the index of the upper roller reduction;

S3B3, judging whether the values of the current outlet residual curvature radius and the outlet residual curvature radius calculated in the previous time are different in sign, if so, entering the step S3B 4;

S3B4, determining the optimal first roller reduction:

wherein d is₁For the optimal reduction of the top roll, deltad is the iteration step,the last roll depression amount calculated for the previous time. Through the method, the optimal result of the rolling reduction of the first roller can be determined, wherein the speed in the second method is higher, but the outlet residual curvature radius calculated according to the method and the flatness calculated by the outlet residual curvature radius may not meet the final flatness requirement, so that the first method is better in practice.

In this embodiment, the calculation interval is determined according to the following method:

s21, taking the initialization parameter of the top roller as a left end point of a calculation interval;

s22, calculating the curvature radius of an outlet of the strip steel, and determining a curve of the residual curvature radius of the outlet of the strip steel changing along with the rolling amount of the top roll according to the curvature radius of the outlet of the strip steel;

s23, determining the maximum value of the allowable rolling reduction of the upper first roller, and searching each peak point of a curve of which the residual curvature radius of the strip steel outlet changes along with the allowable rolling reduction of the upper first roller in the range of the maximum value of the allowable rolling reduction of the upper first roller;

s24, calculating the flatness of the strip steel under the residual curvature radius corresponding to each peak point, and finding out the rolling reduction of the upper first roller corresponding to the minimum value of the flatness as the right end point of the calculation interval.

Calculating the flatness of the strip steel according to the following formula:

wherein ft is the flatness of the strip steel, R is the residual curvature radius of the strip steel outlet, the unit is mm, A is the length of the target section of the strip steel, namely the area of the strip steel needing flatness calculation, and the general value is 1000 mm; by the method, the final calculation interval can be accurately determined, so that guarantee is provided for final determination of the optimal upper roll reduction; it should be noted that, in practice, the right endpoint may be determined according to the selection of the technician, for example: the maximum rolling reduction allowed by the first roller is 20mm, and in 0-20mm, peak points such as 2mm, 5mm, 9mm, 14mm and 17mm are determined, and the value of the flatness corresponding to the peak point of 17mm is determined to be the minimum by the method, so that 17mm can be selected as the final right end point according to the method, but in order to increase the calculation speed, the flatness of 5mm can meet the process requirements, and at the moment, a technician can use 5mm as the final right end point. After the calculation interval is determined, an iteration step is determined, and the iteration step is selected according to actual requirements, generally, the smaller the iteration step is, the higher the accuracy is, but the larger the calculation amount is, the longer the time is, and generally, the iteration step is selected to be 0.1 mm.

The invention is further illustrated in detail below by means of a specific example:

if the number of the rollers of the straightener is 15, the diameter of the straightening roller is 120mm, the roller spacing is 130mm, the elastic modulus is 208000MPa, the width of the strip steel is 1700mm, the curvature radius of the incoming material is 1000mm, and the rolling reduction of the upper row of final rollers is 0 mm.

The initial top roll reduction is set to 0, and tests show that the flatness of some typical steel grades of the equipment can meet the requirement in the interval [0,5], and partial test results can be shown in figures 1-5. The iteration step size is chosen to be 0.1 mm.

The following table has two tables, where table 1 is the result obtained when the optimal rolling reduction of the top roll is determined by the first method in the above, and table 2 is the result obtained when the optimal rolling reduction of the top roll is determined by the second method in the above:

table 1

Table 2

By comparison of the above tables: the first method has better calculation results, namely the outlet flatness is smaller, the second method has higher speed, but the outlet flatness value is influenced by interval step length and can not meet the requirement necessarily. The calculation time of the two methods is in the ms level, and the method can be used for industrial control.

Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.