Method for wear prediction of a rolling mill work roll

Abstract

The application relates to a wear prediction method for a working roller of a rolling mill, comprising the steps of determining a contact area of the working roller and a strip steel according to the width of the strip steel; calculating the wear amount of the contact area according to a wear parameter; and adding the wear amounts of the contact areas corresponding to a plurality of strip steels to obtain the total wear amount of the working roller; wherein the wear parameter comprises a strip steel brand, a rolling force, a strip steel length and the diameter of the working roller. Through the wear prediction method, an operator can obtain the wear parameters such as the strip steel brand, the rolling force, the strip steel length and the diameter of the working roller, and then calculate the wear amount of the contact area of the working roller and the strip steel according to the wear parameters, so that the wear condition of the working roller can be accurately determined, and the situation that the production is affected due to the judgment error can be avoided. Meanwhile, the wear condition of the working roller can be accurately determined, the normal working roller can be prevented from being replaced in advance, the normal service life of the working roller is ensured, and the use cost is prevented from being increased.

Description

Technical Field

[0001] This invention relates to the field of hot rolling technology, and in particular to a method for predicting wear of rolling mill work rolls. Background Technology

[0002] In hot strip rolling production, direct contact between the work rolls and the strip leads to wear on the work rolls. Severely worn work rolls can cause strip shape defects and abnormal cross-sections, affecting downstream processing. Currently, operators adjust the work rolls based on personal experience, making it difficult to accurately determine their wear condition, which can easily lead to misjudgments and impact production. Summary of the Invention

[0003] Therefore, it is necessary to provide a wear prediction method for rolling mill work rolls that can accurately determine the wear condition of work rolls, addressing the existing problem of the inability to accurately determine the wear condition of work rolls.

[0004] A method for predicting wear of rolling mill work rolls, comprising:

[0005] S110, determine the contact area between the work roll and the strip based on the width of the strip;

[0006] S120, calculate the wear amount of the contact area based on the wear parameters;

[0007] S130, the wear amount of the contact area corresponding to the multiple strips is added together to obtain the total wear amount of the work roll;

[0008] The wear parameters include strip grade, rolling force, strip length, and work roll diameter.

[0009] By implementing the aforementioned wear prediction method, operators can obtain wear parameters such as strip grade, rolling force, strip length, and work roll diameter. Based on these parameters, they can calculate the wear amount in the contact area between the work roll and the strip, thus accurately determining the wear condition of the work roll and avoiding misjudgments that could impact production. Furthermore, accurately determining the wear condition of the work roll can prevent premature replacement of normal work rolls, ensuring their normal service life and avoiding increased operating costs.

[0010] In one embodiment, step S110 further includes the step:

[0011] S111, the working roller is uniformly divided into multiple discrete units along the length direction;

[0012] S112, determine the discrete unit in contact with the strip steel according to the width of the strip steel;

[0013] S113, the contact area is divided into an intermediate area and an edge area, and the discrete unit corresponding to the intermediate area and the discrete unit corresponding to the edge area are determined.

[0014] In one embodiment, step S120 further includes the step:

[0015] S121, calculate the first wear amount W based on the strip steel grade. S The second wear amount W is calculated based on the rolling force. P The third wear amount W is calculated based on the strip length. L The fourth wear amount W is calculated based on the diameter of the working roller. D ;

[0016] S122, the wear amount of the contact area is calculated using the following formula;

[0017] W c =W S +W P +W L +W D ;

[0018] Among them, W c This represents the amount of wear in the contact area.

[0019] In one embodiment, step S121 further includes the step:

[0020] Obtain the finishing mill inlet temperature Fet and the finishing mill outlet temperature Fdt;

[0021] The first wear amount is calculated using the following formula:

[0022] W S =μ*σ*Fet*Fdt;

[0023] Where μ is the reference wear rate and σ is the wear coefficient per pass.

[0024] In one embodiment, step S121 further includes the step:

[0025] Obtain the rolling force P and the strip width B;

[0026] The second wear amount is calculated using the following formula:

[0027] W P =θ*P / B;

[0028] Where θ is the correction coefficient.

[0029] In one embodiment, step S121 further includes the step:

[0030] Get the strip length Len;

[0031] The third wear amount is calculated using the following formula;

[0032] W L =αe -Len / 10^6 ;

[0033] Where α is the correction coefficient.

[0034] In one embodiment, step S121 further includes the step:

[0035] Obtain the original diameter of the work roll and the actual machine diameter of the work roll;

[0036] The fourth wear amount is calculated using the following formula;

[0037] W D =1+C*(D0+D w );

[0038] Where C is the correction factor, D0 is the original diameter of the work roll, and D w This is the actual machine diameter of the working roller.

[0039] In one embodiment, after determining the contact area between the work roll and the strip, the contact area is divided into a middle area and an edge area.

[0040] In step S122, W c The amount of wear in the intermediate region

[0041] Step S120 also includes:

[0042] S123, calculate the wear amount of the edge region based on the wear amount of the middle region.

[0043] In one embodiment, the amount of wear in the edge region is calculated using the following formula;

[0044] W e =W c *τ;

[0045] Among them, W e Let τ be the wear amount of the edge region, and τ be the uneven wear function of the work roll, where τ > 1. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 A flowchart of a wear prediction method for rolling mill work rolls according to an embodiment of the present invention;

[0048] Figure 2 for Figure 1 The flowchart of step S110 in the wear prediction method shown is as follows;

[0049] Figure 3 for Figure 1 The flowchart of step S120 in the wear prediction method shown is shown. Implementation

[0050] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0051] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0052] To facilitate understanding of the technical solution of this invention, the impact of the inability to accurately determine the wear condition of the work rolls in existing hot rolling processes is explained below:

[0053] When operators cannot accurately determine the wear condition of the work roll, it is possible that the actual wear of the work roll is severe enough to render it unusable, but the operator misjudges and continues to use it, thus affecting production. Conversely, it is also possible that the actual wear of the work roll is minor enough to continue using it, but the operator misjudges and replaces it, leading to increased operating costs.

[0054] like Figure 1 As shown, an embodiment of the present invention provides a method for predicting the wear of rolling mill work rolls, the method comprising the following steps:

[0055] S110, determine the contact area between the work roll and the strip based on the width of the strip.

[0056] S120, calculate the wear amount in the contact area based on wear parameters.

[0057] The wear parameters include strip grade, rolling force, strip length, and work roll diameter.

[0058] S130, the wear amount of the contact area corresponding to multiple strips is added together to obtain the total wear amount of the work roll.

[0059] It is understandable that after each strip passes through the rolling mill, the work roll will experience a certain amount of wear. Therefore, the wear amount of the corresponding contact area of ​​each strip can be calculated according to steps S110 to S120. Then, the wear amounts of the corresponding contact areas of multiple strips are added together to obtain the total wear amount of the work roll.

[0060] By implementing the aforementioned wear prediction method, operators can obtain wear parameters such as strip grade, rolling force, strip length, and work roll diameter. Based on these parameters, they can calculate the wear amount in the contact area between the work roll and the strip, thus accurately determining the wear condition of the work roll and avoiding misjudgments that could impact production. Furthermore, accurately determining the wear condition of the work roll can prevent premature replacement of normal work rolls, ensuring their normal service life and avoiding increased operating costs.

[0061] In some embodiments, in step S110, after determining the contact area between the work roll and the strip, the contact area is divided into a middle area and an edge area.

[0062] In step S120, the wear amount in the middle region is calculated based on the wear coefficient, and then the wear amount in the edge region is calculated based on the wear amount in the middle region.

[0063] It should be explained that during the operation, when the work roll comes into contact with the edge of the strip and wears, there may be uneven wear. The wear that occurs in the middle area where it comes into contact with the strip is generally uniform. Moreover, there is a certain calculation relationship between uniform wear and uneven wear. Therefore, the amount of wear in the middle area is calculated first, and then the amount of wear in the edge area is calculated from the amount of wear in the middle area.

[0064] Please see Figure 2 In some embodiments, step S110 further includes the step of:

[0065] S111 divides the work roll into multiple discrete units evenly along its length.

[0066] Specifically, when the length of the working roll is 2550mm and the accuracy of the working roll profile curve is 12.75mm, the number of discrete units is 2550 / 12.75=200, that is, the working roll is divided into 200 discrete units along its length, and the length of each discrete unit is 12.75mm.

[0067] Meanwhile, the working roller has a driving end connected to the driving component and an operating end along its length. The discrete units are numbered along the direction from the driving end to the operating end. In this embodiment, there are a total of 200 numbers, and the discrete unit closest to the driving end is numbered 1, and the discrete unit closest to the operating end is numbered 200.

[0068] S112, determine the discrete units in contact with the strip based on the width of the strip.

[0069] It should be noted that, under normal circumstances, the centerline of the strip coincides with the radial centerline of the work roll. Moreover, when the width of the strip cannot be divided by the length of each discrete unit, the number of discrete units in contact with the strip is determined by rounding up.

[0070] For example, one end of the strip extends along the width direction of the work roll to the middle of the discrete unit numbered 50, and the other end extends to the middle of the discrete unit numbered 150. At this time, no matter which position the strip extends to in the discrete units numbered 50 and 150, the discrete units in contact with the strip can be determined to be numbered 15 to 150.

[0071] Furthermore, when roll shifting occurs on the work roll, the amount and direction of the shift must first be determined. Then, based on the amount and direction of the shift, the discrete units on the work roll that contact the strip are determined. For example, under normal circumstances, the discrete units on the work roll that contact the strip are numbered from 50 to 150. If the work roll shifts towards the drive end, and the shift amount is 25.5 mm (2 discrete units), the contact area on the work roll with the strip is shifted towards the operating end by 2 discrete units. In this case, the discrete units on the work roll that contact the strip are numbered from 52 to 152.

[0072] It should be explained that, due to the different widths of the strip steel or the possibility of roll shifting, the contact area between the work roll and different strip steels may differ, meaning that the location of wear between the work roll and different strip steels may vary.

[0073] Therefore, determining the location of the contact area each time wear is calculated, that is, determining the location of the discrete contact unit, can more accurately calculate the total wear of the work roll.

[0074] For example, the discrete element numbers corresponding to the first contact area are 50 to 150, and the discrete element numbers corresponding to the second contact area are 40 to 140. The wear amount of the discrete elements numbered 40 to 140 is the sum of the wear amounts of the two contact areas, while the wear amounts of the discrete elements numbered 40 to 40 and 140 to 150 are the wear amounts of the first contact area.

[0075] S113, determine the discrete unit corresponding to the middle region and the discrete unit corresponding to the edge region.

[0076] Specifically, the discrete units corresponding to both ends of the strip along the length of the work roll are edge regions.

[0077] For example, under normal circumstances, when the discrete units on the work roll that come into contact with the strip are numbered 50 to 150, the edge region is the two discrete units numbered 50 and 150, no matter where the strip extends in the discrete units numbered 50 and 150.

[0078] Furthermore, it is understandable that the wear amounts in the contact area, intermediate area, and edge area mentioned above actually refer to the wear amounts of a single discrete unit corresponding to the contact area, the intermediate area, and the edge area. The total wear amount of multiple strips is the sum of the wear amounts of the corresponding discrete units.

[0079] Therefore, after determining the discrete units corresponding to the middle and edge regions, when calculating the total wear amount corresponding to multiple strips, the total wear amount corresponding to each discrete unit can be calculated. Moreover, after the total wear amount of the discrete unit reaches the target wear amount, it can be determined that the work roll has reached its service life and needs to be replaced.

[0080] Please see Figure 3 In some embodiments, step S120 further includes the step of:

[0081] S121, calculate the first wear amount W based on the strip steel grade. S The second wear amount W is calculated based on the rolling force. P The third wear amount W is calculated based on the strip length. L The fourth wear amount W is calculated based on the diameter of the working roller. D .

[0082] Specifically:

[0083] In calculating the first wear amount W S At that time, the finishing mill inlet temperature Fet and finishing mill outlet temperature Fdt of the strip can be obtained according to the strip grade, and then the first wear amount W can be calculated using the following formula. S .

[0084] W S =μ*σ*Fet*Fdt, where μ is the reference wear rate and σ is the wear coefficient per pass.

[0085] In calculating the second wear amount W P First, the rolling force P and strip width B can be obtained, and then the second wear amount W can be calculated using the following formula. P .

[0086] W P =θ*P / B, where θ is the correction factor.

[0087] In calculating the third wear amount W L First, obtain the strip length Len, then calculate the third wear amount W using the following formula. L .

[0088] W L =αe -Len / 10^6 , where α is the correction coefficient.

[0089] In calculating the fourth wear amount W D At this time, the original diameter D0 and the actual machine diameter D of the work roll can be obtained first. w Then, the fourth wear amount W is calculated using the following formula. D .

[0090] W D =1+C*(D0+D w ), where C is the correction factor.

[0091] It should be explained that the original diameter of the work roll refers to the diameter of the work roll before it is put on the machine, that is, before it has undergone rolling. However, the actual machine diameter generally refers to the work roll that has undergone rolling and has been worn.

[0092] Additionally, it is understandable that when a work roll that has never undergone rolling is put onto the mill, its actual diameter on the mill is the original diameter.

[0093] S122, the wear amount of the contact area is calculated using the following formula.

[0094] W c =W S +W P +W L +W D Among them, W c This represents the wear amount in the contact area. In other words, the wear amount in the contact area can be obtained by adding the first wear amount, the second wear amount, the third wear amount, and the fourth wear amount calculated above.

[0095] It is understood that uneven wear is not considered in this embodiment.

[0096] When considering uneven wear, W c The wear amount in the intermediate region, and step S120 further includes the following steps:

[0097] S123, calculate the wear amount of the edge area based on the wear amount of the middle area.

[0098] Specifically, the wear amount in the edge area is calculated using the following formula.

[0099] W e =W c *τ, where W e Let τ represent the wear amount in the edge region, and τ be the function of uneven wear of the work roll, where τ > 1.

[0100] In conjunction with the above embodiments, it should be noted that the reference wear rate μ, the wear coefficient per pass σ, the correction coefficient θ, the correction coefficient α, the correction coefficient C, and the uneven wear function τ can be determined by actually measuring the wear of the work roll through multiple experiments, and then fitting the actual measurement data with the above calculation formula.

[0101] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0102] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A method for predicting wear of rolling mill work rolls, characterized in that, include: S110, determine the contact area between the work roll and the strip based on the width of the strip; S120, calculate the wear amount of the contact area based on the wear parameters; S130, the wear amount of the contact area corresponding to the multiple strips is added together to obtain the total wear amount of the work roll; The wear parameters include strip grade, rolling force, strip length, and work roll diameter; Step S120 also includes the following steps: S121, calculate the first wear amount W based on the strip steel grade. S The second wear amount W is calculated based on the rolling force. P The third wear amount W is calculated based on the strip length. L The fourth wear amount W is calculated based on the diameter of the working roller. D ; S122, the wear amount of the contact area is calculated using the following formula; W c =W S +W P +W L +W D W c The wear amount of the contact area; In S121: Obtain the finishing mill inlet temperature Fet and the finishing mill outlet temperature Fdt; Through formula W S =μ*σ*Fet*Fdt calculates the first wear amount, where μ is the reference wear rate and σ is the wear coefficient per pass; Obtain the rolling force P and the strip width B; Through formula W P =θ*P / B is used to calculate the second wear amount, where θ is a correction factor; Get the strip length Len; Using the formula WL=αe -Len / 10^6 The third wear amount is calculated, where α is a correction factor; Obtain the original diameter of the work roll and the actual machine diameter of the work roll; Through formula W D =1+C*(D0+D w Calculate the fourth wear amount, where C is the correction factor, D0 is the original diameter of the work roll, and D w This is the actual machine diameter of the work roll.

2. The wear prediction method for rolling mill work rolls according to claim 1, characterized in that, Step S110 also includes the following steps: S111, the working roller is uniformly divided into multiple discrete units along the length direction; S112, determine the discrete unit in contact with the strip steel according to the width of the strip steel; S113, the contact area is divided into an intermediate area and an edge area, and the discrete unit corresponding to the intermediate area and the discrete unit corresponding to the edge area are determined.

3. The wear prediction method for rolling mill work rolls according to claim 1, characterized in that, After determining the contact area between the work roll and the strip, the contact area is divided into the middle area and the edge area; In step S122, W c The amount of wear in the intermediate region Step S120 also includes: S123, calculate the wear amount of the edge region based on the wear amount of the middle region.

4. The wear prediction method for rolling mill work rolls according to claim 3, characterized in that, The wear amount of the edge region is calculated using the following formula; W e =W c *τ; Among them, W e Let τ be the wear amount of the edge region, and τ be the uneven wear function of the work roll, where τ > 1.

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