Roller thermal deformation forecasting method suitable for high-speed wire rod rolling mill

Abstract

The invention discloses a roller thermal deformation forecasting method suitable for a high-speed wire rod rolling mill, which comprises the following steps of: selecting unit length, unitizing a roller groove of a roller according to the shape of the roller groove, solving the temperature of each unit of the roller, calculating the thermal deformation of each unit according to the calculated unit temperature, and finally obtaining the roller thermal deformation of the high-speed wire rod rolling mill. According to the method, the roller thermal deformation forecasting model is established based on the equipment of the wire unit and the technological characteristics of high-speed wire production, and subsequent management of roller thermal cracks and roller groove abrasion is facilitated.

Description

Technical Field

[0001] The invention relates to a high-speed wire rolling technology, and more specifically to a roller thermal deformation prediction method suitable for a high-speed wire rolling mill. Background Art

[0002] In recent years, with the rapid development of the construction industry, the demand for wire products has gradually increased. High-speed wire mills have become the mainstream of wire production. In order to ensure the quality and output of wire, save costs and reduce production capacity, it is necessary to ensure the quality of the rollers, make them less worn, and reduce the incidence of defects, so as to reduce the wire quality problems caused by the rollers. Therefore, how to improve the quality of the rollers, reduce roller consumption, and extend the online cycle of the rollers has become an urgent problem to be solved on site. At present, the rollers of the 13H and 14V frames of the high-speed wire rolling mill have thermal cracks and large wear on the surface of the roller grooves. On the one hand, the formation of thermal cracks increases the amount of roller turning after the machine is removed, increasing the production cost. On the other hand, the appearance of thermal cracks will gradually increase with the progress of production, which may cause the roller surface to peel off, causing major production accidents and affecting the production efficiency of the unit. On the one hand, the large amount of roller wear shortens the service life of the rollers and increases the frequency of roller replacement, which is not conducive to improving production efficiency and affecting the output of the unit. On the other hand, the increase in wear will also lead to a large amount of roller turning, increasing the production cost of the production line. Therefore, it is necessary to reduce the probability of thermal cracks and the amount of roller groove wear through research on the rolling roller production process.

[0003] In order to study the probability of thermal cracks and the wear of the roller groove surface, it is necessary to predict the thermal deformation of the rollers of the high-speed wire mill. At present, according to the search of patent literature, most of the research on thermal deformation in China is on the prediction method of thermal deformation of ordinary rollers, while there is almost no research on the prediction method of thermal deformation of rollers of high-speed wire mills. Summary of the invention

[0004] In view of the defects existing in the prior art, the purpose of the present invention is to provide a roller thermal deformation prediction method suitable for high-speed wire rod rolling mills. Based on the equipment of the wire rod unit and the process characteristics of high-speed wire production, a roller thermal deformation prediction model is established to facilitate the subsequent management of roller thermal cracks and roller groove wear.

[0005] To achieve the above object, the present invention adopts the following technical solution:

[0006] A method for predicting thermal deformation of rolls suitable for high-speed wire rolling mills:

[0007] The unit length is selected, and the roll groove of the roller is unitized according to the shape of the roll groove. The temperature of each unit of the roller is solved, and the thermal deformation of each unit is calculated based on the calculated unit temperature, and finally the thermal deformation of the roller of the high-speed wire rolling mill is obtained.

[0008] Preferably, the selecting unit length, unitizing the roller groove according to the shape of the roller groove, and solving the temperature of each unit of the roller specifically comprises the following steps:

[0009] (A) Determine equipment and process parameters;

[0010] (B) Introduction of calculation parameters;

[0011] (C) unitizing the groove surface of the roller according to the unit length;

[0012] (D) The temperature T of each unit of the roller is obtained by the temperature field prediction method i,j .

[0013] Preferably, the equipment and process parameters in step (A) include Poisson's ratio v, roller linear expansion coefficient α, roller radius R w , roller groove radius R c , rolling temperature T A , cooling water temperature T B , indoor air temperature T C , the heat transfer coefficient between the workpiece and the roller α A , the heat transfer coefficient between cooling water and roller α B , the heat transfer coefficient between air and roller α C , roll density ρ, thermal conductivity k1, k2, roll groove specific heat C p1 , Roller heat C p2 , the axial length of the roller groove is lz, and the radial length of the roller groove is lr.

[0014] Preferably, the introduction of calculation parameters in step (B) specifically includes:

[0015] Introduce intermediate parameters i, j, and set i=1, j=1;

[0016] Introduce the unit length parameter l and set l equal to the set size;

[0017] Introducing the intermediate parameter r = R w -lr-l, is the distance from the lowest point of the roller groove to the roller axis minus l;

[0018] Introduce the intermediate parameter r0, r0=r+i·l.

[0019] Preferably, the unitization of the groove surface of the roller in the step (C) specifically includes:

[0020] The roller is divided along the axial direction and represented by j, with the maximum value j max ;

[0021] On this basis, each part is further divided radially and represented by i, with the maximum value i max .

[0022] Preferably, if the roller is symmetrical, half of the unit length of the roller is cut off.

[0023] Preferably, the step of calculating the thermal deformation of each unit by calculating the unit temperature specifically includes the following steps:

[0024] (E) Determine j≤j max Is it established? If yes, go to step (F); if not, go to step (H);

[0025] (F) Determine i≤i max Is it true? If it is true, go to step (G). If it is not true, then j=j+1, i=1 and go to step (E);

[0026] (G) Based on thermal deformation calculation model Complete the unit thermal deformation calculation, i=i+1, and go to step (F);

[0027] (H) According to the calculation model Calculating the thermal deformation of the roller along the radial direction;

[0028] (I) Calculated one-dimensional data μ j (j=1,2,3......), which is the thermal deformation of the roller at various locations along the axial direction.

[0029] The present invention provides a method for predicting thermal deformation of rollers suitable for high-speed wire rod rolling mills. The method combines theoretical models with actual on-site production data to establish a thermal deformation prediction model that conforms to the actual on-site production of high-speed wire rod rolling mills. The thermal deformation data is provided for subsequent research on thermal cracks and roller groove wear of high-speed wire rod rolling mills, thereby further ensuring wire quality and output, saving costs, reducing production capacity, and better serving high-speed wire production. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic flow chart of the method for predicting thermal deformation of a rolling mill roll according to the present invention. DETAILED DESCRIPTION

[0031] In order to better understand the above technical solution of the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0032] Combination Figure 1 As shown, the present invention provides a method for predicting thermal deformation of a roller suitable for a high-speed wire rolling mill:

[0033] The unit length is selected, and the roll groove of the roll is unitized according to the shape of the roll groove. The temperature of each unit of the roll is solved, and the thermal deformation of each unit is calculated by the calculated unit temperature. Finally, the thermal deformation of the roll of the high-speed wire mill is obtained, which is convenient for the subsequent study of the thermal cracks of the roll and the wear of the roll groove. The specific steps include:

[0034] (A) Determine equipment and process parameters, including Poisson's ratio v, roller linear expansion coefficient α, roller radius R w , roller groove radius R c , rolling temperature T A , cooling water temperature T B , indoor air temperature T C , the heat transfer coefficient between the workpiece and the roller α A , the heat transfer coefficient between cooling water and roller α B , the heat transfer coefficient between air and roller α C , roll density ρ, thermal conductivity k1, k2, roll groove specific heat C p1 , Roller heat C p2 , roller groove axial length lz, roller groove radial length lr;

[0035] (B) Introduce calculation parameters: introduce intermediate parameters i, j, and set i = 1, j = 1; introduce unit length parameter l, and set l equal to the set size; introduce intermediate parameter r = R w -lr-l, is the distance from the lowest point of the roller groove to the roller axis minus l; introduce the intermediate parameter r0, r0 = r + i l;

[0036] (C) Unitize the roller groove surface of the roller according to the unit length. If the roller is symmetrical, cut off half of the unit length of the roller. Divide the roller along the axial direction and represent it with j, and the maximum value is j max ; On this basis, each part is further divided radially and represented by i, with the maximum value being i max .

[0037] (D) The temperature T of each unit of the roller is obtained by the temperature field prediction method i,j ;

[0038] (E) Determine j≤j max Is it established? If yes, go to step (F); if not, go to step (H);

[0039] (F) Determine i≤i max Is it true? If it is true, go to step (G). If it is not true, then j=j+1, i=1 and go to step (E);

[0040] (G) Based on thermal deformation calculation model Complete the unit thermal deformation calculation, i=i+1, and go to step (F);

[0041] (H) According to the calculation model Calculate the thermal deformation of the roller along the radial direction;

[0042] (I) Calculated one-dimensional data μ j (j=1,2,3......), which is the thermal deformation of the roller at various locations along the axial direction.

[0043] Example 1

[0044] In this embodiment 1, a 13H frame of a high-speed rolling mill group is taken as an example. Figure 1 A method for predicting thermal deformation of a roller suitable for a high-speed wire rolling mill comprises the following steps:

[0045] (A) Determine Poisson's ratio v = 0.287, roller linear expansion coefficient α = 0.000012, roller radius R w =210, roller groove radius R c =48, rolling temperature T A =900, cooling water temperature T B =60, indoor air temperature T C =30, heat transfer coefficient between workpiece and roller α A =0.2185, heat transfer coefficient between cooling water and roller α B =0.02163, heat transfer coefficient between air and roller α C =0.0023, roll density ρ = 0.01248, thermal conductivity k1 = 0.009, k2 = 0.05, roll groove specific heat C p1 =460, roller specific heat C p2 =460, roller groove axial length lz = 48.24, roller groove radial length lr = 6.5;

[0046] (B) Introduce intermediate parameters i, j, and set i = 1, j = 1; refer to the unit length parameter l, and set l = 0.2; introduce intermediate parameter r = R w -lr-l=203.3, which is the distance from the lowest point of the roller groove to the roller axis minus l; introduce the intermediate parameter r0, r0=r+i·l;

[0047] (C) Unitize the roll groove surface according to the unit length. If the roll is symmetrical, cut half of it for calculation. Divide the roll along the axial direction and represent it with j. The maximum value is j max = 120. On this basis, each part is divided radially, represented by i, and the maximum value is i max ;

[0048] (D) The temperature T of each unit of the roller is obtained by the temperature field prediction method i,j ;

[0049] (E) Determine j≤j max Is it true? If it is true, go to step (F); if it is not true, go to step (H);

[0050] (F) Determine i≤i max Is it true? If it is true, go to step (G); if it is not true, j = j + 1, i = 1 and go to step (E);

[0051] (G) At this time, the thermal deformation calculation model of the unit is:

[0052]

[0053] The unit thermal deformation calculation is completed, i=i+1, and the process goes to step (F);

[0054] (H) Calculate the thermal deformation of the roller along the radial direction. The calculation model is:

[0055] (I) Calculate the one-dimensional array μ j (j=1,2,3......) is the thermal deformation of the roller along the axial direction, μ1=2.0388mm, μ 24 =2.0410mm,μ 68 =2.0575mm, μ 96 =2.0789mm.

[0056] Example 2

[0057] This embodiment 2 takes a 13H frame of a high-speed rolling mill group as an example, and then refers to Figure 1 A method for predicting thermal deformation of a roller suitable for a high-speed wire rolling mill comprises the following steps:

[0058] (A) Determine Poisson's ratio v = 0.300, roller linear expansion coefficient α = 0.000020, roller radius R w =210, roller groove radius R c =48, rolling temperature T A =900, cooling water temperature T B =60, indoor air temperature T C =30, heat transfer coefficient between workpiece and roller α A =0.2256, heat transfer coefficient between cooling water and roller α B =0.02343, heat transfer coefficient between air and roller α C =0.0021, roll density ρ = 0.01156, thermal conductivity k1 = 0.008, k2 = 0.052, roll groove specific heat C p1 =455, roller specific heat C p2=455, roller groove axial length lz = 48.24, roller groove radial length lr = 6.5;

[0059] (B) Introduce intermediate parameters i, j, and set i = 1, j = 1; refer to the unit length parameter l, and set l = 0.2; introduce intermediate parameter r = R w -lr-l=203.3, which is the distance from the lowest point of the roller groove to the roller axis minus l; introduce the intermediate parameter r0, r0=r+i·l;

[0060] (C) Unitize the roll groove surface according to the unit length. If the roll is symmetrical, cut half of it for calculation. Divide the roll along the axial direction and represent it with j. The maximum value is j max = 120. On this basis, each part is divided radially, represented by i, and the maximum value is i max ;

[0061] (D) The temperature T of each unit of the roller is obtained by the temperature field prediction method i,j ;

[0062] (E) Determine j≤j max Is it true? If it is true, go to step (F); if it is not true, go to step (H);

[0063] (F) Determine i≤i max Is it true? If it is true, go to step (G); if it is not true, j = j + 1, i = 1 and go to step (E);

[0064] (G) At this time, the thermal deformation calculation model of the unit is:

[0065]

[0066] The unit thermal deformation calculation is completed, i=i+1, and the process goes to step (F);

[0067] (H) Calculate the thermal deformation of the roller along the radial direction. The calculation model is:

[0068] (I) Calculate the one-dimensional array μ j (j=1,2,3......) is the thermal deformation of the roller at various locations along the axial direction, μ1=3.4207mm, μ 24 =3.4243mm, μ 68 =3.4524mm, μ 96 =3.4906mm.

[0069] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. As long as they are within the spirit of the present invention, any changes or modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. A method for predicting thermal deformation of a roller suitable for a high-speed wire rolling mill, characterized in that: The unit length is selected, and the roll groove of the roller is unitized according to the shape of the roll groove. The temperature of each unit of the roller is solved, and the thermal deformation of each unit is calculated based on the calculated unit temperature, and finally the thermal deformation of the roller of the high-speed wire rolling mill is obtained.

2. The method for predicting thermal deformation of a roller suitable for a high-speed wire rolling mill according to claim 1, characterized in that: The selecting unit length, unitizing the roller groove according to the shape of the roller groove, and solving the temperature of each unit of the roller specifically comprises the following steps: (A) Determine equipment and process parameters; (B) Introduction of calculation parameters; (C) unitizing the groove surface of the roller according to the unit length; (D) The temperature T of each unit of the roller is obtained by the temperature field prediction method i,j .

3. The method for predicting thermal deformation of a roller suitable for a high-speed wire rolling mill according to claim 2, characterized in that: The equipment and process parameters in step (A) include Poisson's ratio v, roller linear expansion coefficient α, roller radius R w , roller groove radius R c , rolling temperature T A , cooling water temperature T B , indoor air temperature T C , the heat transfer coefficient between the workpiece and the roller α A , the heat transfer coefficient between cooling water and roller α B , the heat transfer coefficient between air and roller α C , roll density ρ, thermal conductivity k1, k2, roll groove specific heat C p1 , Roller heat C p2 , the axial length of the roller groove is lz, and the radial length of the roller groove is lr.

4. The method for predicting thermal deformation of a roller suitable for a high-speed wire rolling mill according to claim 3, characterized in that: The step (B) of introducing the calculation parameters specifically includes: Introduce intermediate parameters i, j, and set i=1, j=1; Introduce the unit length parameter l and set l equal to the set size; Introducing the intermediate parameter r = R w -lr-l, is the distance from the lowest point of the roller groove to the roller axis minus l; Introduce the intermediate parameter r0, r0=r+i·l.

5. The method for predicting thermal deformation of a roller suitable for a high-speed wire rolling mill according to claim 4, characterized in that: The step (C) of unitizing the groove surface of the roller specifically includes: The roller is divided along the axial direction and represented by j, with the maximum value j max ; On this basis, each part is further divided radially and represented by i, with the maximum value i max .

6. The method for predicting thermal deformation of a roller suitable for a high-speed wire rolling mill according to claim 5, characterized in that: If the roller is symmetrical, half of the unit length of the roller is cut off.

7. The method for predicting thermal deformation of a roller suitable for a high-speed wire rolling mill according to claim 4, characterized in that: The step of calculating the thermal deformation of each unit by calculating the unit temperature specifically includes the following steps: (E) Determine j≤j max Is it established? If yes, go to step (F); if not, go to step (H); (F) Determine i≤i max Is it true? If it is true, go to step (G). If it is not true, then j=j+1, i=1 and go to step (E); (G) Based on thermal deformation calculation model Complete the unit thermal deformation calculation, i=i+1, and go to step (F); (H) According to the calculation model Calculating the thermal deformation of the roller along the radial direction; (I) Calculated one-dimensional data μ j (j=1,2,3......), which is the thermal deformation of the roller at various locations along the axial direction.

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