Method for compensating the bite impact on the roll gap of a rolling mill
By dynamically calculating the impact gap between the rolling mill's steel biting impact rolls, the problem of insufficient adaptability of the traditional lookup table method for compensating for the impact gap between the rolling mill's steel biting impact rolls is solved, achieving high-precision and stable thickness control, which is suitable for modern rolling production lines.
Patent Information
- Application Number
- CN202610414957.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-03-31
- Publication Date
- 2026-06-12
AI Technical Summary
Traditional lookup table methods are not very adaptable to the gap compensation of steel biting impact rolls in rolling mills. They are difficult to adapt to changes in working conditions, resulting in deviations in head thickness control and failing to meet the high precision and multi-variety requirements of modern rolling production lines.
By sampling the actual stroke of the AGC hydraulic cylinder multiple times, combined with the predicted rolling force and finished product thickness adjustment factor, the impact roll gap compensation value is dynamically calculated, and a limit protection is set to achieve online compensation.
It significantly improves the accuracy of strip head thickness, reduces thickness deviation transmission, enhances the stability and production efficiency of the rolling process, and is suitable for high-precision and multi-variety production lines.
Smart Images
Figure CN122184101A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of metallurgical automation control technology, and in particular to a method for compensating for the impact gap of rolling mill steel biting. Background Technology
[0002] In the field of metal rolling, compensation for the impact gap of steel biting on the rolling mill is traditionally set using a lookup table method. This method relies on pre-established empirical data tables and has the advantages of rapid response and low system computational load. However, when the roll condition, process conditions, or product specifications exceed the range of the preset table, the compensation accuracy will decrease significantly, and its adaptability is weak. In addition, facing the natural evolution of equipment conditions and the frequent production of new specifications and new steel grades, the lookup table method requires continuous data accumulation and table updates, which is difficult to effectively cope with changes in operating conditions and cannot adapt to the production needs of multiple varieties. Therefore, it is only suitable for production scenarios with relatively stable operating conditions and simple product structure.
[0003] Hot rolling systems are characterized by extremely high equipment precision requirements, strong inter-process correlation, and significant dynamic mutual influence of process parameters. Furthermore, the production process is accompanied by complex conditions such as high temperature, high pressure, and high speed. In actual rolling, they are easily affected by multiple factors such as fluctuations in operating conditions, changes in the state of intermediate billets, equipment precision drift, and aging. It is difficult to ensure that the bite state is completely consistent each time. If the lookup table compensation method is continued, it is difficult to adapt to the above changes in real time, which can easily lead to deviations in head thickness control. Summary of the Invention
[0004] The purpose of this invention is to provide a method for compensating for the impact gap of steel biting in rolling mills in order to solve the above-mentioned problems.
[0005] The present invention achieves the above objectives through the following technical solutions: A method for compensating for the impact gap of steel biting in a rolling mill specifically includes the following steps: S1. After the waiting frame completes the preset execution, delay for a period of time, sample the actual AGC hydraulic cylinder stroke of the waiting frame multiple times and calculate the actual AGC hydraulic cylinder stroke lock value. S2. Based on the actual AGC hydraulic cylinder stroke lock value, and combined with parameters such as the predicted rolling force of the stand, calculate the impact roll gap pre-compensation value of the stand. The calculation formula for the impact roll gap pre-compensation value is as follows: , G cmp1 The pre-compensation value for the impact roll gap is given in mm, F. pri This is the predicted rolling force value for this stand, in tons (tons) and seconds (S). tk The actual AGC stroke value locked for this rack, in meters (m) and kJ. pK is the unit conversion factor for the compensation value, with a value range of [0.002, 0.003]. c This is the correction coefficient for the compensation value, with a value range of [0.5, 1.5]. S3. Introduce a finished product thickness adjustment factor, and calculate the required impact roll gap compensation value for the frame based on the pre-compensation value of the impact roll gap. The formula for calculating the impact roll gap compensation value is as follows: , G cmp The impact roll gap compensation value is expressed in mm and T. set This refers to the thickness of the finished product, in mm (T). ref The reference thickness value is 5, and the unit is mm; S4. Set a limiting protection for the impact roll gap compensation value; S5. After the steel biting of the stand is completed, delay for a period of time and then cancel the impact roll gap compensation value of the stand.
[0006] Furthermore, the delay period after the preset execution is completed is defined as T. acc1 The value range is [5, 200], and the unit is ms.
[0007] Furthermore, the actual AGC hydraulic cylinder stroke value is the average value of multiple samples of the actual AGC hydraulic cylinder stroke, calculated using the following formula: , S tk S is the actual AGC hydraulic cylinder stroke lock value. act The actual stroke of the AGC hydraulic cylinder is given in meters (m), and the controller sampling period is T. A The value range is [1, 50], the unit is ms, and N is the number of samples, with a value range of [2, 100].
[0008] Furthermore, step S4 specifically includes: It is determined whether the impact roll gap compensation value calculated in step S3 falls within the amplitude limiting range set by the amplitude limiting protection. When the calculated impact roll gap compensation value exceeds the amplitude limiting range, the impact roll gap compensation value adopts the amplitude limiting value S. lim When the calculated impact roll gap compensation value falls within the specified amplitude range, the impact roll gap compensation value remains unchanged. The limiting range is a sub-interval of the interval [0.1, 1.0], and the limiting value S lim The endpoint value of the amplitude limiting range.
[0009] Furthermore, step S5 specifically includes: After the rack is fully engaged with the steel, there will be a delay of T. acc2 With slope V acc Cancel the compensation value for this rack; T acc2 The value range is [5, 200], and the unit is ms, V acc The value range is [0.05, 0.2], and the unit is mm / s.
[0010] The beneficial effects are as follows: The method for compensating for the impact roll gap of the rolling mill described in this invention is based on a dynamic calculation method using actual process data to calculate the impact roll gap compensation value online. It can actively follow changes in working conditions, effectively overcome the inherent limitations of the lookup table method, and significantly improve the accuracy of the thickness of the strip head. Precise compensation can suppress the generation of thickness deviations and their transmission downstream from the source, reduce the adjustment burden and system fluctuations of subsequent stands or passes, not only help improve thickness accuracy, but also reduce unnecessary frequent adjustments, and enhance the overall stability and production efficiency of the rolling process. It has significant advantages in control precision, adaptability to operating conditions, and long-term maintainability, and is especially suitable for modern rolling production lines with high precision requirements and a wide variety of products. Attached Figure Description
[0011] Figure 1 This is a flowchart illustrating the process of a method for compensating for the impact gap between steel-biting rolls in a rolling mill, as described in this invention. Detailed Implementation
[0012] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0013] The following combination Figure 1 To further explain the invention, a method for compensating for the impact gap of steel biting in a rolling mill specifically includes the following steps: S1. After the waiting frame completes the preset execution, delay for a period of time, sample the actual AGC hydraulic cylinder stroke of the waiting frame multiple times and calculate the actual AGC hydraulic cylinder stroke lock value. Among them, a delay T is defined after the preset time is completed. acc1 The given value range is [5, 200], the unit is ms, and the controller sampling period T A The given value range is [1, 50], the unit is ms, and the given sampling number N is [2, 100]. All three value ranges are given by experience. The actual AGC hydraulic cylinder stroke lock value is the average value of multiple samples of the actual AGC hydraulic cylinder stroke, and the calculation formula is: , S tk S is the actual AGC hydraulic cylinder stroke lock value. act The actual stroke of the AGC hydraulic cylinder is expressed in meters (m). S2. Based on the actual AGC hydraulic cylinder stroke lock value obtained from step S1, and combined with parameters such as the predicted rolling force of the stand, calculate the impact roll gap pre-compensation value of the stand. The formula for calculating the pre-compensation value of the impact roll gap is as follows: , G cmp1 This is the pre-compensation value for impact roll gap, in mm, F pri This is the predicted rolling force value for this stand, in tons (tons) and seconds (S). tk This is the actual AGC stroke lock value for this rack, in meters (m) and kilometer (K). p The unit conversion factor for the compensation value is given a range of [0.002, 0.003], K c The correction coefficient for the compensation value is given a range of [0.5, 1.5], K p With K c The range of values for is given by empirical values; S3. Introduce the finished product thickness adjustment factor, and calculate the required impact roll gap compensation value for the frame based on the impact roll gap pre-compensation value calculated in step S2. The formula for calculating the impact roll gap compensation value is as follows: , G cmp This is the impact roll gap compensation value, in mm, G. cmp1 This is the pre-compensation value for impact roll gap, in mm and T. set This refers to the thickness of the finished product, in mm (T). ref The reference thickness value is 5, which is an empirical value given here, and the unit is mm. S4. Set a limit protection for the impact roll gap compensation value calculated in step S3; It is determined whether the impact roll gap compensation value calculated in step S3 falls within the limiting range set by the limiting protection. If the calculated impact roll gap compensation value exceeds the limiting range, the impact roll gap compensation value adopts the limiting value S. lim When the calculated impact roll gap compensation value falls within the limiting range, the impact roll gap compensation value remains unchanged. The limiting range is a sub-interval of the interval [0.1, 1.0], and the limiting value S... limThese are the endpoint values of the limiting range, which is given empirically. After the amplitude limiting process, the final impact roll gap compensation value is obtained, which is used to calculate the actual roll gap value when the frame bites the steel. The actual roll gap value is the preset roll gap value minus this final impact roll gap compensation value. S5. After the steel biting of the stand is completed, delay for a period of time and then cancel the impact roll gap compensation value of the stand. Among them, after the standby frame is engaged with the steel, there is a delay of a certain period of time T. acc2 With slope V acc Cancel the compensation value for this rack; Among them, T acc2 The given empirical value range is [5, 200], and the unit is ms, V acc The given empirical value range is [0.05, 0.2], and the unit is mm / s.
[0014] The following describes the implementation process of the present invention using the F1 rack and its actual data as examples. The specific steps are as follows: S1. After F1 rack completes the preset execution, delay for a period of time, sample the actual AGC hydraulic cylinder stroke of F1 rack multiple times and calculate the actual AGC hydraulic cylinder stroke lock value of F1 rack; In this embodiment, the delay time after the F1 rack equipment completes the preset operation is set to 100ms. The actual AGC travel amount of the F1 rack is sampled 10 times. The calculation formula for the actual AGC travel amount lock value is as follows: , The controller sampling period is 20ms, and the number of samples is 10. The data obtained from sampling and calculation are shown in Table 1: Table 1 S2. Based on the actual AGC hydraulic cylinder stroke lock value obtained in step S1, and combined with parameters such as the predicted rolling force of F1 stand, calculate the impact roll gap pre-compensation value of F1 stand. In this embodiment, the formula for calculating the pre-compensation value of the impact roll gap of frame F1 is as follows: , The unit conversion factor for the compensation value of the F1 rack is 0.003, and the correction factor for the compensation value is 1.1. Detailed data obtained by substituting these values into the above formula are shown in Table 2. Table 2 S3. Introduce the finished product thickness adjustment factor, and calculate the impact roll gap compensation value required for frame F1 based on the impact roll gap pre-compensation value calculated in step S2. The formula for calculating the impact roll gap compensation value of frame F1 is as follows: , T ref Using the baseline thickness value, with an empirically given value of 5, and substituting it into the impact roll gap compensation value calculation, detailed data are shown in Table 3: Table 3 S4. Set a limit protection for the impact roll gap compensation value of F1 frame. When the impact roll gap compensation value exceeds the limit range set by the limit protection, the impact roll gap compensation value adopts the boundary value of the limit range. In this embodiment, the limiting range of the F1 frame is [0.2, 0.8], in mm. When the calculated impact roll gap compensation value is greater than 0.8, the impact roll gap compensation value is limited to 0.8 mm. When the calculated impact roll gap compensation value is less than 0.2, the impact roll gap compensation value is limited to 0.2 mm. When the calculated impact roll gap compensation value is within [0.2, 0.8], the original value is used. The impact roll gap compensation value calculated in step S3 is 0.6138mm, which is within the limit range of the F1 frame. Therefore, the impact roll gap compensation value after the limit protection is also 0.6138mm, which is used to calculate the actual roll gap value when the F1 frame bites the steel, that is, the preset roll gap value minus 0.6138mm. S5. After the F1 frame has finished biting the steel, delay for a period of time and then cancel the impact roll gap compensation value of the F1 frame.
[0015] In this embodiment, the delay time after the F1 frame completes the steel biting is set to 100ms, and the impact roll gap compensation value of the F1 frame is canceled at a slope of 0.08 mm per second.
[0016] Through the above embodiments, it can be seen that after the equipment completes the preset execution, a certain delay is made, and the actual stroke of the AGC hydraulic cylinder of the stand is sampled. Combined with parameters such as the predicted rolling force, the pre-compensation value of the impact roll gap of the stand is calculated. Furthermore, the finished product thickness adjustment factor is introduced to calculate the impact roll gap compensation value required for the stand to bite the steel. This process is based on the dynamic calculation of actual process data. The impact roll gap compensation value is calculated online according to the actual working conditions. It can actively follow the changes in working conditions, effectively overcome the inherent limitations of the lookup table method, and significantly improve the accuracy of the thickness of the strip head.
[0017] At the same time, precise compensation can suppress the generation of thickness deviations and their transmission downstream from the source, reduce the adjustment burden and system fluctuations of subsequent stands or passes, not only to improve thickness accuracy, but also to reduce unnecessary frequent adjustments, thereby enhancing the overall stability and production efficiency of the rolling process.
[0018] In addition, this calculation method has significant advantages in terms of control accuracy, adaptability to operating conditions, and long-term maintainability. It is especially suitable for modern rolling production lines with high precision requirements and a wide variety of products, and has significant engineering application value and industry promotion significance.
[0019] Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed.
Claims
1. A method for compensating for the impact gap of steel biting in a rolling mill, characterized in that, Includes the following steps: S1. After the waiting frame completes the preset execution, delay for a period of time, sample the actual AGC hydraulic cylinder stroke of the waiting frame multiple times and calculate the actual AGC hydraulic cylinder stroke lock value. S2. Based on the actual AGC hydraulic cylinder stroke lock value, and combined with parameters such as the predicted rolling force of the stand, calculate the impact roll gap pre-compensation value of the stand. The calculation formula for the impact roll gap pre-compensation value is as follows: ， G cmp1 The pre-compensation value for the impact roll gap is given in mm, F. pri This is the predicted rolling force value for this stand, in tons (tons) and seconds (S). tk The actual AGC stroke value locked for this rack, in meters (m) and kJ. p K is the unit conversion factor for the compensation value, with a value range of [0.002, 0.003]. c This is the correction coefficient for the compensation value, with a value range of [0.5, 1.5]. S3. Introduce a finished product thickness adjustment factor, and calculate the required impact roll gap compensation value for the frame based on the pre-compensation value of the impact roll gap. The formula for calculating the impact roll gap compensation value is as follows: ， G cmp The impact roll gap compensation value is expressed in mm and T. set This refers to the thickness of the finished product, in mm (T). ref The reference thickness value is 5, and the unit is mm; S4. Set a limiting protection for the impact roll gap compensation value; S5. After the steel biting of the stand is completed, delay for a period of time and then cancel the impact roll gap compensation value of the stand.
2. The method for compensating for the impact gap of steel biting in a rolling mill according to claim 1, characterized in that: Define the time delay after the preset execution as T. acc1 The value range is [5, 200], and the unit is ms.
3. The method for compensating for the impact gap of steel biting in a rolling mill according to claim 1, characterized in that: The actual AGC hydraulic cylinder stroke lock value is the average value of multiple samples of the actual AGC hydraulic cylinder stroke. The formula for calculating the actual AGC hydraulic cylinder stroke lock value is as follows: ， S tk S is the actual AGC hydraulic cylinder stroke lock value. act The actual stroke of the AGC hydraulic cylinder is given in meters (m), and the controller sampling period is T. A The value range is [1, 50], the unit is ms, and N is the number of samples, with a value range of [2, 100].
4. The method for compensating for the impact gap of steel biting in a rolling mill according to claim 1, characterized in that, Step S4 is as follows: It is determined whether the impact roll gap compensation value calculated in step S3 falls within the amplitude limiting range set by the amplitude limiting protection. When the calculated impact roll gap compensation value exceeds the amplitude limiting range, the impact roll gap compensation value adopts the amplitude limiting value S. lim When the calculated impact roll gap compensation value falls within the specified amplitude range, the impact roll gap compensation value remains unchanged. The limiting range is a sub-interval of the interval [0.1, 1.0], and the limiting value S lim The endpoint value of the amplitude limiting range.
5. The method for compensating for the impact gap of steel biting in a rolling mill according to claim 1, characterized in that, Step S5 is as follows: After the rack is fully engaged with the steel, there will be a delay of a certain period of time (T). acc2 With slope V acc Cancel the compensation value for this rack; T acc2 The value range is [5, 200], and the unit is ms, V acc The value range is [0.05, 0.2], and the unit is mm / s.