A method and device for calculating working roll wear in lubrication rolling mode

Abstract

An embodiment of the present application discloses a method and device for calculating the wear of a work roll under a lubricated rolling mode, which relates to the technical field of metallurgical automation. The method includes the following steps: establishing a work roll wear calculation formula including the K oil coefficient; calculating the value of the K oil coefficient based on the normalized exponential function; measuring the saturation value q _full of the rolling oil amount and the correction coefficient value K oil_full corresponding to the saturated rolling oil amount, and drawing a curve based on the lubricating oil injection amount data to obtain the value of the exponential coefficient α; substituting the values of q _full , K oil_full and α into the normalized exponential function respectively to obtain the value of the K oil coefficient, and obtaining the calculated value of the work roll wear under the lubricated rolling mode based on the work roll wear calculation formula. By measuring the rolling oil wear correction coefficient K oil under different oil injection amounts, the present application improves the calculation accuracy of the work roll wear under the lubricated rolling mode, solves the problem of distorted calculation of the work roll wear, and improves the quality of the strip shape.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of metallurgical automation technology, and specifically to a method and device for calculating working roll wear in a lubrication rolling mode. Background Art

[0002] The work roll wear in the lubrication rolling mode of the plate and strip hot rolling line is lower than that in normal rolling. It is usually calculated by multiplying the normal rolling wear value by K oil The coefficient (rolling oil wear correction coefficient) value can be used to obtain the calculated value of the working roll wear in the lubricated rolling mode. In the current technology, the working roll wear calculation model of the current secondary system in the lubricated rolling mode reserves an interface in the plate shape constant data area, and the K oil The coefficient value intervenes in the wear calculation value.

[0003] However, in actual application, due to the change of oil injection amount during on-site lubrication rolling, and the manual modification of K oil The coefficient value changes from time to time, resulting in frequent calculation distortion in the working roll wear calculation model under the lubrication rolling mode, which causes a deviation between the calculated wear value and the actual wear value of the roll offline and leads to abnormal plate shape.

[0004] Therefore, based on the problems existing in the calculation model of working roll wear under the existing lubrication rolling mode, it is necessary to provide a new calculation method to improve the K of each stand under different oil injection amounts. oil accuracy. Summary of the invention

[0005] The purpose of the present invention is to provide a method and device for calculating working roll wear in a lubricated rolling mode, so as to solve the problem of distortion in working roll wear calculation in the prior art and improve the calculation accuracy of working roll wear.

[0006] To achieve the above object, the present invention discloses the following technical solution:

[0007] On the one hand, the present invention provides a method for calculating working roll wear in a lubrication rolling mode, the method comprising the following steps:

[0008] Create a K oil The working roll wear calculation formula of coefficient;

[0009] Calculate K based on the normalized exponential function oil The coefficient value, the normalized exponential function is shown in formula (1),

[0010]

[0011] In the formula, q _full represents the saturation value of rolling oil, α represents the exponential coefficient, Koil_full Indicates the correction coefficient corresponding to the saturated rolling oil volume;

[0012] Determine the rolling oil saturation value q _full The correction coefficient value K corresponding to the saturated rolling oil volume oil_full , and draw a curve based on the lubrication injection amount data to obtain the value of the exponential coefficient α;

[0013] The q _full , K oil_full Substitute the values ​​of and into formula (1) to obtain K oil The coefficient value is obtained, and the working roll wear calculation value in the lubrication rolling mode is obtained based on the working roll wear calculation formula.

[0014] The above working roll wear calculation method, the establishment includes K oil In the step of calculating the working roll wear calculation formula of the coefficient, the working roll wear calculation formula is shown in formula (2):

[0015]

[0016] Wherein, Twm(water) represents the calculated wear value in the non-lubricated rolling mode, Twm(oil) represents the calculated wear value in the lubricated rolling mode, P represents the rolling pressure, B represents the strip width, lc represents the flattening contact arc length, Lz represents the rolling kilometers, D represents the working roll diameter, k1 represents the model coefficient, k2 represents the load influence coefficient, and δ(x) represents the function describing the uneven degree of lateral wear of the working roll.

[0017] The above working roll wear calculation method, the rolling oil saturation value q _full Correction coefficient K corresponding to the saturated rolling oil volume oil_full In the step, the determination method is binary search.

[0018] The above working roll wear calculation method uses the binary search method to determine the rolling oil saturation value q _full Correction coefficient K corresponding to the saturated rolling oil volume oil_full The steps further include:

[0019] The maximum oil injection amount of the lubricating rolling equipment is used for oil injection test, and the corresponding K oil The coefficient value is recorded as K oil_max ;

[0020] Use binary search method to test the K corresponding to the current injection amount q oil Coefficient value, and determine the current K oil Is the coefficient value equal to the K oil_max value;

[0021] If not, repeat the binary search method to test the K corresponding to the injection amount q. oil Coefficient value, until the current K oil The coefficient value is equal to the K oil_max value;

[0022] If so, record the current q _full =q,K oil_full =K oil .

[0023] In the above working roll wear calculation method, in the step of drawing a curve based on the lubricating oil injection amount data to obtain the exponential coefficient α value, the drawn curve is a regression curve.

[0024] Another aspect of the present invention provides a working roll wear calculation device in a lubrication rolling mode, the device comprising:

[0025] Formula building module, used to build K oil The working roll wear calculation formula of coefficient;

[0026] K oil Coefficient calculation module, used to calculate K based on the normalized exponential function oil The coefficient value, the normalized exponential function is shown in formula (1),

[0027]

[0028] In the formula, q _full represents the saturation value of rolling oil, α represents the exponential coefficient, K oil_full Indicates the correction coefficient corresponding to the saturated rolling oil volume;

[0029] The intermediate coefficient calculation module is used to determine the rolling oil saturation value q _full The correction coefficient value K corresponding to the saturated rolling oil volume oil_full , and draw a curve based on the lubrication injection amount data to obtain the value of the exponential coefficient α;

[0030] A wear value calculation module is used to convert the q _full , K oil_full Substitute the values ​​of and into formula (1) to obtain K oil The coefficient value is obtained, and the calculated value of the working roll wear under the lubrication rolling mode is obtained based on the established working roll wear calculation formula.

[0031] The working roll wear calculation device mentioned above, the formula establishment module establishes a formula including K oil The working roll wear calculation formula of the coefficient is shown in formula (2):

[0032]

[0033] Wherein, Twm(water) represents the calculated wear value in the non-lubricated rolling mode, Twm(oil) represents the calculated wear value in the lubricated rolling mode, P represents the rolling pressure, B represents the strip width, lc represents the flattening contact arc length, Lz represents the rolling kilometers, D represents the working roll diameter, k1 represents the model coefficient, k2 represents the load influence coefficient, and δ(x) represents the function describing the uneven degree of lateral wear of the working roll.

[0034] The working roll wear calculation device described above, wherein the intermediate coefficient calculation module determines the rolling oil saturation value q _full The correction coefficient value K corresponding to the saturated rolling oil volume oil_full , the determination method is binary search.

[0035] The above working roll wear calculation device, the intermediate coefficient calculation module uses a binary search method to determine the rolling oil saturation value q _full Correction coefficient K corresponding to the saturated rolling oil volume oil_full , further comprising:

[0036] The maximum oil injection amount of the lubricating rolling equipment is used for oil injection test, and the corresponding K oil The coefficient value is recorded as K oil_max ;

[0037] Use binary search method to test the K corresponding to the current injection amount q oil Coefficient value, and determine the current K oil Is the coefficient value equal to the K oil_max value;

[0038] If not, repeat the binary search method to test the K corresponding to the injection amount q. oil Coefficient value, until the current K oil The coefficient value is equal to the K oil_max value;

[0039] If so, record the current q _full =q,K oil_full =K oil .

[0040] In the above-mentioned working roll wear calculation device, the intermediate coefficient calculation module draws a curve based on the lubricating oil injection amount data to obtain the value of the exponential coefficient α, and the drawn curve is a regression curve.

[0041] The effects provided in the content of the invention are only the effects of the embodiments, not all the effects of the invention. One of the above technical solutions has the following advantages or beneficial effects:

[0042] In the embodiment of the present application, K is calculated based on the normalized exponential function. oil The coefficient value is calculated by taking into full account the influence of lubricating oil injection amount on the wear of the working roll. The rolling oil wear correction coefficient K under different oil injection amounts is calculated. oil The calculation accuracy of working roll wear in lubrication rolling mode is improved, the problem of distortion in working roll wear calculation is solved, and the quality of strip shape is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0044] Figure 1 A schematic flow chart of a method for calculating working roll wear in a lubrication rolling mode provided in an embodiment of the present application;

[0045] Figure 2 The exponential coefficient α changes with K oil Influence curve diagram of coefficients;

[0046] Figure 3 is the correction coefficient K corresponding to the saturated rolling oil volume oil_full Changes in K oil Influence curve diagram of coefficients;

[0047] Figure 4 To determine q using binary search _full and K oil_full Schematic diagram of the method flow chart:

[0048] Figure 5 A regression curve of sample data of lubrication injection quantity according to an embodiment of the present invention;

[0049] Figure 6 A schematic diagram of the structure of a working roll wear calculation device in a lubrication rolling mode provided in one embodiment of the present application. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0051] It should be noted that references to "one embodiment", "embodiment", "example embodiment", etc. in this specification refer to the embodiment described, which may include specific features, structures or characteristics, but not every embodiment must include these specific features, structures or characteristics. In addition, such expressions do not refer to the same embodiment. Furthermore, when describing specific features, structures or characteristics in conjunction with an embodiment, whether or not there is an explicit description, it has been shown that it is within the knowledge of those skilled in the art to combine such features, structures or characteristics into other embodiments.

[0052] In addition, certain words are used in the specification and subsequent claims to refer to specific components or parts. Those with ordinary knowledge in the relevant field should understand that manufacturers can use different nouns or terms to refer to the same component or part. This specification and subsequent claims do not use differences in names as a way to distinguish components or parts, but use differences in the functions of components or parts as the criteria for distinction. "Including" and "including" mentioned throughout the specification and subsequent claims are open-ended terms and should be interpreted as "including but not limited to". In addition, the word "connected" here includes any direct and indirect electrical connection means. Indirect electrical connection means include connection through other devices.

[0053] refer to Figure 1 , Figure 1 A schematic flow chart of a method for calculating working roll wear in a lubrication rolling mode provided in an embodiment of the present application is shown, and the method comprises the following steps:

[0054] S110, establish a K oil The working roll wear calculation formula of coefficient;

[0055] The working roll wear of the hot rolling mill is affected by many factors, mainly: the characteristics of the strip steel itself, including the rolling temperature, rolling thickness and width, material and surface oxide scale characteristics of the strip steel; the rolling process, mainly including the rolling mileage, lubrication conditions, rolling load, cooling conditions, etc.; the roll aspects, including the roll material, roll surface roughness, roll diameter, etc. Therefore, in the specific implementation, the working roll wear calculation formula is expressed by the following formula (2):

[0056]

[0057] Wherein, Twm(water) represents the calculated wear value in the non-lubricated rolling mode, Twm(oil) represents the calculated wear value in the lubricated rolling mode, P represents the rolling pressure, B represents the strip width, lc represents the flattening contact arc length, Lz represents the rolling kilometers, D represents the working roll diameter, k1 represents the model coefficient, k2 represents the load influence coefficient, and δ(x) represents the function describing the uneven degree of lateral wear of the working roll.

[0058] S220, calculating K based on the normalized exponential function oil The coefficient value, the normalized exponential function is shown in formula (1),

[0059]

[0060] In the formula, q _full represents the saturation value of rolling oil, α represents the exponential coefficient, K oil_full Indicates the correction coefficient corresponding to the saturated rolling oil amount.

[0061] As mentioned above, the existing normal rolling wear calculation value is multiplied by the correction factor K. oil The calculated value of the working roll wear in the lubricated rolling mode is obtained. Since different lubricant injection amounts affect the thickness of the lubricating layer oil film in the deformation zone, the larger the oil amount, the thicker the oil film, the smaller the friction coefficient, and the more obvious the improvement on the roll wear, so the correction coefficient K oil It is expressed using a normalized exponential function based on the amount of rolling oil. Correction coefficient K oil It decreases with the increase of oil volume, but the decreasing speed shows a decaying trend. The functional relationship can be adjusted by the coefficient. Figure 2 , Figure 3 As shown, Figure 2 The exponential coefficient α changes with K oil The influence of coefficients; Figure 3 The correction coefficient K corresponding to the saturated rolling oil volume is shown. oil_full Changes in K oil The influence of coefficient.

[0062] S130, determining the rolling oil saturation value q _full The correction coefficient value K corresponding to the saturated rolling oil volume oil_full , and draw a curve based on the lubrication injection amount data to obtain the value of the exponential coefficient α;

[0063] In the specific implementation, the binary search method can be used to determine the rolling oil saturation value q _full Correction coefficient K corresponding to the saturated rolling oil volume oil_full ,like Figure 4 As shown, the binary search method is used to determine q _full and K oil_fullThe steps further include:

[0064] S131, use the maximum oil injection amount of the lubricating rolling equipment to perform the oil injection test, and set the K corresponding to the maximum oil injection amount oil The coefficient value is recorded as K oil_max ;

[0065] S132, use binary search method to test the K corresponding to the current injection amount q oil coefficient value;

[0066] S133, determine the current K oil Is the coefficient value equal to the K oil_max value,

[0067] If not, jump to step S132 and repeat the binary search method to test the K corresponding to the injection amount q. oil coefficient value;

[0068] S134, if yes, then record the current q _full =q,K oil_full =K oil .

[0069] In a specific implementation, a curve is drawn based on the lubricating oil injection amount data to obtain the value of the exponential coefficient α. Preferably, the drawn curve is a regression curve. In one embodiment, the lubricating oil injection amount sample data is tested in increments of 25 ml of particle size, and the wear correction coefficient of each rack is determined by the actual wear value of the offline working roll. The test record is shown in Table 1 below:

[0070] Table 1 Lubrication rolling oil injection sample data measurement record

[0071]

[0072] The regression curve is drawn for the above lubrication injection amount sample data, such as Figure 5 As shown, the value of the exponential coefficient α is obtained.

[0073] S140, the above-obtained q _full , K oil_full Substitute the values ​​of and into formula (1) to obtain K oil The coefficient value is obtained, and the calculated value of the working roll wear in the lubrication rolling mode is obtained based on the working roll wear calculation formula (2).

[0074] It should be noted that, for the method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the embodiments of the present application are not limited by the described order of actions, because according to the embodiments of the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions involved are not necessarily required by the embodiments of the present application.

[0075] refer to Figure 6 , Figure 6 The schematic diagram of the structure of the working roll wear calculation device in the lubricated rolling mode provided by an embodiment of the present application is shown. The working roll wear calculation in the lubricated rolling mode can be realized by using the device. The device described below can be referred to in correspondence with the method described above. The device 600 includes:

[0076] Formula building module 610 is used to build a formula including K oil The working roll wear calculation formula of coefficient;

[0077] K oil Coefficient calculation module 620, used to calculate K based on the normalized exponential function oil The coefficient value, the normalized exponential function is shown in formula (1),

[0078]

[0079] In the formula, q _full represents the saturation value of rolling oil, α represents the exponential coefficient, K oil_full Indicates the correction coefficient corresponding to the saturated rolling oil volume;

[0080] The intermediate coefficient calculation module 630 is used to determine the rolling oil saturation value q _full The correction coefficient value K corresponding to the saturated rolling oil volume oil_full , and draw a curve based on the lubrication injection amount data to obtain the value of the exponential coefficient α;

[0081] The wear value calculation module 640 is used to convert the q _full , K oil_full Substitute the values ​​of and into formula (1) to obtain K oil The coefficient value is obtained, and the calculated value of the working roll wear under the lubrication rolling mode is obtained based on the established working roll wear calculation formula.

[0082] In some embodiments, the formula building module 610 builds a formula including K oil The working roll wear calculation formula of the coefficient is shown in formula (2):

[0083]

[0084] Wherein, Twm(water) represents the calculated wear value in the non-lubricated rolling mode, Twm(oil) represents the calculated wear value in the lubricated rolling mode, P represents the rolling pressure, B represents the strip width, lc represents the flattening contact arc length, Lz represents the rolling kilometers, D represents the working roll diameter, k1 represents the model coefficient, k2 represents the load influence coefficient, and δ(x) represents the function describing the uneven degree of lateral wear of the working roll.

[0085] In some embodiments, the intermediate coefficient calculation module 630 determines the rolling oil saturation value q _full The correction coefficient value K corresponding to the saturated rolling oil volume oil_full In the specific implementation, the intermediate coefficient calculation module 630 uses the binary search method to determine q _full and K oil_full , which may specifically include:

[0086] The maximum oil injection amount of the lubricating rolling equipment is used for oil injection test, and the corresponding K oil The coefficient value is recorded as K oil_max ;

[0087] Use binary search method to test the K corresponding to the current injection amount q oil Coefficient value, and determine the current K oil Is the coefficient value equal to the K oil_max value;

[0088] If not, repeat the binary search method to test the K corresponding to the injection amount q. oil Coefficient value, until the current K oil The coefficient value is equal to the K oil_max value;

[0089] If so, record the current q _full =q,K oil_full =K oil .

[0090] In some implementations, the intermediate coefficient calculation module plots a curve based on the lubrication oil injection quantity data to obtain a value of the exponential coefficient α, and the plotted curve is a regression curve.

[0091] The present application provides a method and device for calculating the working roll wear in a lubricated rolling mode. The average deviation between the calculated wear value and the measured value is 3.14%, which is 14.04% lower than the previous 17.18%. The calculated working roll wear value is closer to the measured value, thereby improving the calculation accuracy of the plate shape model.

[0092] Although the present application has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements may be made to the present application. Therefore, these modifications or improvements made without departing from the spirit of the present application are within the scope of protection claimed by the present application.

Claims

1. A method for calculating working roll wear in lubrication rolling mode, characterized in that: The following steps are involved: Create a K oil The working roll wear calculation formula of coefficient; Calculate K based on the normalized exponential function oil The coefficient value, the normalized exponential function is shown in formula (1), In the formula, q _full represents the rolling oil saturation value, q represents the current injection amount, α represents the exponential coefficient, K oil_full Indicates the correction coefficient corresponding to the saturated rolling oil volume, K oil Indicates the rolling oil wear correction factor; Determine the rolling oil saturation value q _full The correction coefficient value K corresponding to the saturated rolling oil volume oil_full , and draw a curve based on the lubrication injection amount data to obtain the value of the exponential coefficient α; The rolling oil saturation value q _full , Correction coefficient K corresponding to saturated rolling oil volume oil_full Substitute the values ​​of the exponential coefficient α into formula (1) to obtain K oil The coefficient value is obtained, and the working roll wear calculation value in the lubrication rolling mode is obtained based on the working roll wear calculation formula.

2. The method for calculating working roll wear in lubrication rolling mode according to claim 1, characterized in that: The establishment includes K oil In the step of calculating the working roll wear calculation formula of the coefficient, the working roll wear calculation formula is shown in formula (2): Where, Twm(water) represents the calculated wear value in the non-lubricated rolling mode, Twm(oil) represents the calculated wear value in the lubricated rolling mode, P represents the rolling pressure, B represents the strip width, l c Indicates the flattened contact arc length, L z represents the rolling mileage, D represents the working roll diameter, k1 represents the model coefficient, k2 represents the load influence coefficient, and δ(x) represents the function describing the uneven degree of lateral wear of the working roll.

3. The method for calculating working roll wear in lubrication rolling mode according to claim 2, characterized in that: Determining the rolling oil saturation value q _full Correction coefficient K corresponding to the saturated rolling oil volume oil_full In the step, the determination method is binary search.

4. The method for calculating working roll wear in lubrication rolling mode according to claim 3, characterized in that: Determination of rolling oil saturation value q by binary search method _full Correction coefficient K corresponding to the saturated rolling oil volume oil_full The steps further include: Use the maximum oil injection amount of the lubricating rolling equipment to conduct the oil injection test, and calculate the K corresponding to the maximum oil injection amount. oil The coefficient value is recorded as K oil_max ; Use binary search method to test the K corresponding to the current injection amount q oil Coefficient value, and determine the current K oil Is the coefficient value equal to the K oil_max value; If not, repeat the binary search method to test the K corresponding to the injection amount q. oil Coefficient value, until the current K oil The coefficient value is equal to the K oil_max value; If so, record the current q _full =q,K oil_full =K oil .

5. The method for calculating working roll wear in lubrication rolling mode according to claim 1, characterized in that: In the step of drawing a curve based on the lubrication oil injection amount data to obtain the exponential coefficient α value, the drawn curve is a regression curve.

6. A working roll wear calculation device in lubrication rolling mode, characterized in that: The device comprises: Formula building module, used to build K oil The working roll wear calculation formula of coefficient; K oil Coefficient calculation module, used to calculate K based on the normalized exponential function oil The coefficient value, the normalized exponential function is shown in formula (1), In the formula, q _full represents the rolling oil saturation value, q represents the current injection amount, α represents the exponential coefficient, K oil_full Indicates the correction coefficient corresponding to the saturated rolling oil volume, K oil Indicates the rolling oil wear correction factor; The intermediate coefficient calculation module is used to determine the rolling oil saturation value q _full The correction coefficient value K corresponding to the saturated rolling oil volume oil_full , and draw a curve based on the lubrication injection amount data to obtain the value of the exponential coefficient α; The wear value calculation module is used to convert the rolling oil saturation value q _full , Correction coefficient K corresponding to saturated rolling oil volume oil_full Substitute the values ​​of the exponential coefficient α into formula (1) to obtain K oil The coefficient value is obtained, and the working roll wear calculation value in the lubrication rolling mode is obtained based on the working roll wear calculation formula.

7. The working roll wear calculation device in the lubrication rolling mode according to claim 6, characterized in that: The formula building module builds a formula containing K oil The working roll wear calculation formula of the coefficient is shown in formula (2): Where, Twm(water) represents the calculated wear value in the non-lubricated rolling mode, Twm(oil) represents the calculated wear value in the lubricated rolling mode, P represents the rolling pressure, B represents the strip width, l c Indicates the flattened contact arc length, L z represents the rolling mileage, D represents the working roll diameter, k1 represents the model coefficient, k2 represents the load influence coefficient, and δ(x) represents the function describing the uneven degree of lateral wear of the working roll.

8. The working roll wear calculation device in the lubrication rolling mode according to claim 7, characterized in that: The intermediate coefficient calculation module determines the rolling oil saturation value q _full Correction coefficient K corresponding to the saturated rolling oil volume oil_full In the step, the determination method is binary search.

9. The working roll wear calculation device in the lubrication rolling mode according to claim 8, characterized in that: The intermediate coefficient calculation module uses a binary search method to determine the rolling oil saturation value q _full Correction coefficient K corresponding to the saturated rolling oil volume oil_full The steps further include: Use the maximum oil injection amount of the lubricating rolling equipment to conduct the oil injection test, and calculate the K corresponding to the maximum oil injection amount. oil The coefficient value is recorded as K oil_max ; Use binary search method to test the K corresponding to the current injection amount q oil Coefficient value, and determine the current K oil Is the coefficient value equal to the K oil_max value; If not, repeat the binary search method to test the K corresponding to the injection amount q. oil Coefficient value, until the current K oil The coefficient value is equal to the K oil_max value; If so, record the current q _full =q,K oil_full =K oil .

10. The working roll wear calculation device in the lubrication rolling mode according to claim 6, characterized in that: In the step of the intermediate coefficient calculation module drawing a curve based on the lubrication oil injection quantity data to obtain the exponential coefficient α value, the drawn curve is a regression curve.

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