Fine roller matching method of sendzimir mill

Abstract

The invention relates to a refined roller matching method of a sendzimir mill, and belongs to the technical field of cold rolling. According to the method, the value range of the left and right eccentricity is determined by establishing the roll gap calculation model and utilizing the optimization method, and finally the value range of the roll diameter of the working roll is determined, so that refined roll matching is realized. The method comprises the following specific steps: acquiring related calculation parameters, establishing a roll gap calculation model, determining a lower limit and an upper limit of values of left and right eccentricity, and determining a value range of the roll diameter of a working roll. The method has the advantages of high roller matching efficiency, high precision, high applicability and the like, and the production efficiency and the product quality of the sendzimir mill can be effectively improved.

Description

Technical Field

[0001] The invention belongs to the technical field of cold rolling and relates to a refined roll matching method for a Sendzimir rolling mill. Background Art

[0002] The Sendzimir rolling mill is widely used in the production of high-end products such as silicon steel, stainless steel, and ultra-thin strips due to its small diameter, high overall rigidity, and high rolling accuracy. However, its complex roll system structure and large number of rolls also bring challenges to roll matching. Unreasonable roll diameter matching will lead to roll interference and affect the normal operation of the rolling mill. If the working roll diameter is too large, the opening will be insufficient and affect the strip threading; if the working roll diameter is too small, the thickness of the finished strip cannot be guaranteed, which reduces the product quality.

[0003] At present, domestic steel mills mainly rely on production experience to select the working roll diameter, which requires a long time of exploration, is inefficient and difficult to ensure the quality of roll matching. In addition, the pressing mechanism and roll diameter compensation mechanism of the Sendzimir rolling mill will change the roll gap, making it present a nonlinear change, making it difficult to directly determine the critical conditions of roll system interference and the working roll diameter range. Therefore, there is an urgent need for a new roll matching method that can quickly and accurately determine the working roll diameter and improve roll matching efficiency and product quality. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a method for finely adjusting rolls of a Sendzimir rolling mill.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A method for finely adjusting rolls of a Sendzimir rolling mill comprises the following steps:

[0007] Get relevant calculation parameters;

[0008] Establish a roll gap calculation model;

[0009] Determine the lower limit of the left and right eccentricity;

[0010] Determine the upper limit of the left and right eccentricity;

[0011] Determine the range of left and right eccentricity;

[0012] Determine the minimum working roll diameter;

[0013] Determine the maximum working roll diameter;

[0014] Determine the range of working roll diameter.

[0015] Furthermore, in the step of obtaining relevant calculation parameters, the obtained relevant calculation parameters include device parameters and model parameters required for calculation.

[0016] Further, in the step of establishing a roll gap calculation model, the roll gap calculation model is:

[0017]

[0018] In the formula, G 12 is the roller gap between the two rollers, mm; (x1, y1) and (x2, y2) are the coordinates of the roller centers of the two rollers respectively; R1 and R2 are the radii of the two rollers respectively, in mm.

[0019] Further, in the determination of the lower limits of the left and right eccentricities, determining the lower limits of the left and right eccentricities means that when the left and right eccentricities are adjusted at this position, the roll gap of the working roll can take a maximum value.

[0020] Furthermore, in the determination of the upper limit of the left and right eccentricities, determining the upper limit of the left and right eccentricities means that when the left and right eccentricities are adjusted at this position, the gap between the middle rollers is the smallest and no interference occurs.

[0021] Further, in the determination of the value range of the left and right eccentricities, the value range of the left and right eccentricities refers to the value lower limit of the left and right eccentricities to the value upper limit of the left and right eccentricities.

[0022] Furthermore, in the determination of the minimum working roll diameter, determining the minimum working roll diameter means that when the minimum working roll diameter is used, the roll system does not interfere with each other during the process of adjusting the pressure reduction and the rolling line, and at least the minimum finished thickness strip can be rolled.

[0023] Furthermore, in the determination of the maximum working roll diameter, determining the maximum working roll diameter means that when the maximum working roll diameter is used, the roll system does not interfere with each other during the adjustment of the pressure reduction and the rolling line, and at least the maximum thickness raw material strip can pass through the rolling mill smoothly.

[0024] Further, in the value range of determining the roll diameter of the working roll, the value range of determining the roll diameter of the working roll refers to the minimum roll diameter of the working roll to the maximum roll diameter of the working roll.

[0025] The beneficial effects of the present invention are as follows: the value range of the left and right eccentricities is determined by the condition that the working roll gap and the roll system do not interfere with each other, and then the value range of the working roll diameter is determined according to the value range of the left and right eccentricities and the roll matching requirements, so as to realize the refined roll matching of the Sendzimir rolling mill.

[0026] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0028] Figure 1 It is a schematic diagram of the Sendzimir rolling mill;

[0029] Figure 2 This is the calculation flow chart of the matching roller.

[0030] Reference numerals: A to H are backup rolls, I to N are second intermediate rolls, O to R are first intermediate rolls, and S to T are working rolls. DETAILED DESCRIPTION

[0031] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0032] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0033] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0034] The roll numbers of the Sendzimir mill are shown in Figure 1. A~H are support rolls, I~N are second intermediate rolls, O~R are first intermediate rolls, and S~T are working rolls. Among them, A, D, E, F, G, and H rolls are single eccentric structures. A and H rolls adjust the left eccentricity, D and E rolls adjust the right eccentricity, F and G rolls adjust the rolling line, and B and C rolls are double eccentric structures to adjust ASU and pressure.

[0035] In Example 1 to Example 2:

[0036] The equipment parameters in step (1) include the coordinates of the center of the saddle ring, the eccentricity, the eccentricity range, etc., as shown in Tables 1 to 5.

[0037] Table 1 Coordinates of the center of the upper saddle ring

[0038] coordinate Ax Ay Bx By Cx Cy Dx Dy Value / mm -400.05 215.9 -149.225 400.05 149.225 400.05 400.05 215.9

[0039] Table 2 Coordinates of the center of the lower saddle ring

[0040] coordinate Ex Ey Fx F Gx Gy Hx Hy Value / mm 400.05 -215.9 149.225 -400.05 -149.225 -400.05 -400.05 -215.9

[0041] Table 3 Upper support roller deflection angle range

[0042]

[0043] Table 4 Deflection angle range of lower support roller

[0044] Roller E F G H Starting angle / degree -15 -30 210 195 End angle / degree 165 44.3 135.7 15

[0045] Table 5 Eccentricity

[0046] Roller A / D / E / H F / G B / C Thickness eccentricity / mm 3.175 6.35 6.35 Convexity eccentricity / mm / / 1.016

[0047] Example 1: Calculation of working roll diameter range.

[0048] The equipment parameters in step (1) include the roller diameters of the support rollers (A~H), the second intermediate rollers (I~N), and the first intermediate rollers (O~R), wherein the roller diameter of the support rollers is 300 mm, the roller diameter of the second intermediate rollers is 173 mm, and the roller diameter of the first intermediate rollers is 102 mm.

[0049] The model parameters required for the calculation in step (1) include a stiffness compensation of 2 mm, a minimum thickness compensation of 0.5 mm, a maximum thickness compensation of 0.5 mm, an intermediate roll gap of 0.5 mm, a raw material thickness of 2.3 mm, and a finished product thickness of 0.23 mm.

[0050] In step (2), the center coordinates of the support rollers (A to H) are calculated based on the saddle ring center and the eccentricity, such as the D roller with a single eccentric structure:

[0051]

[0052] In the formula, (XD ,Y D ) is the coordinate of the center of the saddle ring of the D roller; e3 is the thickness eccentricity of the D roller, in mm; α3 is the thickness eccentricity angle of the D roller, in degrees.

[0053] Such as the C roller with double eccentric structure:

[0054]

[0055] In the formula, (X C ,Y C ) is the coordinate of the center of the saddle ring of the C roller; e1 is the thickness eccentricity of the C roller, in mm; e2 is the convexity eccentricity of the C roller, in mm; α1 is the thickness eccentricity angle of the C roller, in degrees; α2 is the convexity eccentricity angle of the C roller, in degrees.

[0056] The center of the other non-support rollers can be solved according to the Pythagorean theorem. For example, if the C and D rollers are known, the K roller can be found:

[0057]

[0058] In the formula, R C , R K , R D is the radius of C, K, and D rollers.

[0059] Once the coordinates of the roller centers of each roller are known, the roller gap model in step (2) can be established.

[0060] In step (3), the B and C rolls are pressed down to 0, and the F and G rolls are rolled at 0. At this time, the left and right eccentricity ratios are at the lower limit position, so that the roll gap of the working rolls can be maximized. Assume that the objective function is:

[0061] max f(x)=G ST (0.4)

[0062] Where, x is the compensation percentage of the left and right roller diameters, ranging from 0 to 100%; G ST It is the gap between S roller and T roller.

[0063] The lower limit of the left and right roller diameter compensation adjustment can be obtained by using the one-dimensional search golden section method as x min =1.66%.

[0064] In step (4), the minimum intermediate roll gap value is calculated and the objective function is constructed as follows:

[0065] min f(x,y)=G IMR (0.5)

[0066] In the formula, G IMR is the middle roller gap value, y is the pressure adjustment percentage, and the value range is 0 to 100%.

[0067] Using the NelderMead algorithm for two-dimensional search, the upper limit of the left and right roller diameter compensation adjustment is obtained as x max If interference occurs, change the objective function to:

[0068]

[0069] In the formula, is the minimum roll gap value of a given intermediate roll, in mm, which is 0.5 mm in this example.

[0070] The upper limit of the final left and right roller diameter compensation adjustment is x max =39.03%

[0071] In step (5), the range of values ​​of the left and right eccentricity percentages is determined to be [1.66%, 39.03%].

[0072] In step (6), the minimum working roll diameter is determined, the roll system is fully pressed down, the pressing down and rolling line are 100%, and the left and right eccentricity percentages are taken as the upper limit 39.03%. The objective function is:

[0073] min f(D WR )=|G ST -G aim | (0.7)

[0074] G aim =h min -c sf -c h (0.8)

[0075] Where D WR G is the diameter of the working roll, in mm; ST G is the gap between S roller and T roller, in mm; aim is the target working roll gap, in mm; h min is the minimum thickness of the strip, in mm, in this case 0.23 mm; c sf is the rolling mill stiffness compensation, in mm, in this example it is 2 mm; c h It is the minimum thickness compensation of the strip, in mm, and in this example it is 0.5 mm.

[0076] The one-dimensional search golden section method can be used to obtain the minimum working roll diameter of 59.73mm.

[0077] In step (7), the maximum working roll diameter is determined, the roll system is fully opened, the pressure reduction and rolling line are set to 0, and the left and right eccentricity percentages are set to a lower limit of 1.66%. The objective function is:

[0078] min f(D WR )=|GST -G aim | (0.9)

[0079] G aim =h max +c H (0.10)

[0080] Where D WR G is the diameter of the working roll, in mm; ST G is the gap between S roller and T roller, in mm; aim is the target working roll gap, in mm; h max is the maximum thickness of the strip, in mm, in this case 2.3 mm; c H It is the maximum thickness compensation of the strip, in mm, and in this example it is 0.5 mm.

[0081] The one-dimensional search golden section method can be used to obtain the maximum working roll diameter of 64.68mm.

[0082] The working roll diameter range obtained in step (8) is 59.73 mm to 64.68 mm.

[0083] The whole process is shown in Figure 2 .

[0084] Example 2: Roller table calculation.

[0085] In step (1), the equipment parameters are given, the diameter range of the first intermediate roller is given to be 96 mm to 105 mm, the diameter range of the second intermediate roller is given to be 169 mm to 174 mm, and the other parameters are consistent with Example 1.

[0086] By adopting a combination method, for example, given (diameter of the first intermediate roller is 96 mm, diameter of the second intermediate roller is 169 mm), ..., (diameter of the first intermediate roller is 105 mm, diameter of the second intermediate roller is 174 mm), the calculations are performed in sequence using the method of Example 1, and finally the roller matching table can be obtained as shown in Table 6.

[0087] Table 6 Roller matching table

[0088]

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A method for fine roll matching of a Sendzimir rolling mill, characterized in that: The steps include: Get relevant calculation parameters; Establish a roll gap calculation model; Determine the lower limit of the left and right eccentricity; Determine the upper limit of the left and right eccentricity; Determine the range of left and right eccentricity; Determine the minimum working roll diameter; Determine the maximum working roll diameter; Determine the range of working roll diameter.

2. The method for finely adjusting rolls of a Sendzimir rolling mill according to claim 1, characterized in that: In the step of obtaining relevant calculation parameters, the obtained relevant calculation parameters include device parameters and model parameters required for calculation.

3. The method for finely adjusting rolls of a Sendzimir rolling mill according to claim 1, characterized in that: In the step of establishing a roll gap calculation model, the roll gap calculation model is: In the formula, G 12 is the roller gap between the two rollers, mm; (x1, y1) and (x2, y2) are the coordinates of the roller centers of the two rollers respectively; R1 and R2 are the radii of the two rollers respectively, in mm.

4. The method for finely adjusting rolls of a Sendzimir rolling mill according to claim 1, characterized in that: In the determination of the lower limits of the left and right eccentricities, determining the lower limits of the left and right eccentricities means that when the left and right eccentricities are adjusted at this position, the roll gap of the working roll can take the maximum value.

5. The method for finely adjusting rolls of a Sendzimir rolling mill according to claim 1, characterized in that: In the determination of the upper limit of the left and right eccentricity, determining the upper limit of the left and right eccentricity means that when the left and right eccentricity is adjusted at this position, the gap between the middle rollers is the smallest and no interference occurs.

6. The method for finely adjusting rolls of a Sendzimir rolling mill according to claim 1, characterized in that: In the determination of the value range of the left and right eccentricities, the value range of the left and right eccentricities refers to the value lower limit of the left and right eccentricities to the value upper limit of the left and right eccentricities.

7. The method for finely adjusting rolls of a Sendzimir rolling mill according to claim 1, characterized in that: In the determination of the minimum working roll diameter, determining the minimum working roll diameter means that when the minimum working roll diameter is used, the roll system does not interfere with each other during the adjustment of the pressure reduction and the rolling line, and at least the minimum finished thickness strip can be rolled.

8. The method for finely adjusting rolls of a Sendzimir rolling mill according to claim 1, characterized in that: In the determination of the maximum working roll diameter, determining the maximum working roll diameter means that when the maximum working roll diameter is used, the roll system does not interfere with each other during the adjustment of the pressure reduction and the rolling line, and at least the maximum thickness raw material strip can pass through the rolling mill smoothly.

9. The method for finely adjusting rolls of a Sendzimir rolling mill according to claim 1, characterized in that: In the value range of determining the roll diameter of the working roll, the value range of determining the roll diameter of the working roll refers to the minimum roll diameter of the working roll to the maximum roll diameter of the working roll.

Images