Crystallizer vibration control method
By dynamically adjusting the coupled control of the crystallizer amplitude and frequency, the problem of vibration parameter design in the continuous casting process was solved, realizing automatic optimization and dynamic optimization of the crystallizer vibration parameters, and improving the demolding effect and surface quality of the cast billet.
Patent Information
- Application Number
- CN202510988695.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-17
- Publication Date
- 2025-10-17
AI Technical Summary
In the continuous casting process, how to design the crystallizer vibration parameters to coordinate the relationship between billet lubrication and surface quality, especially under different steel grades and casting speeds, to achieve automatic optimization and dynamic optimization of the crystallizer vibration parameters.
By dynamically adjusting the coupled control scheme of crystallizer amplitude and frequency, setting multiple vibration modes, and combining probability selection and profit calculation, the automatic optimization of crystallizer vibration parameters and dynamic optimization of the model can be achieved.
The crystallizer vibration parameters in the continuous casting process were optimized to ensure normal demolding of the billet and improve the surface quality of the billet. The adaptive optimization of the crystallizer vibration parameters was achieved, which improved production stability and billet quality.
Smart Images
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Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to a crystallizer vibration control method, belonging to the continuous casting method technical field in the metallurgical industry. BACKGROUND
[0002] The application of the crystallizer vibration technology successfully solves the sticking problem between the continuous casting billet and the crystallizer, and is an important means to improve the quality of the continuous casting billet. The crystallizer vibration technology makes the crystallizer move according to a specific vibration rule, significantly improves the lubrication effect between the inner wall of the crystallizer and the continuous casting billet, significantly reduces the friction between the two, and effectively reduces the sticking phenomenon between the continuous casting billet and the crystallizer.
[0003] In order to meet the production efficiency and quality requirements of continuous casting, the crystallizer usually adopts a high-frequency and low-amplitude vibration mode during continuous casting. This vibration mode reduces the depth of the continuous casting billet vibration mark, reduces the consumption of the protective slag during continuous casting, intensifies the friction between the continuous casting billet and the crystallizer, and significantly reduces the lubrication effect of the protective slag.
[0004] How to design the crystallizer vibration parameters in a reasonable range to maximize the coordination between the continuous casting billet lubrication and the continuous casting billet surface quality is an important technical problem for metallurgical technicians. In actual production, the continuous casting machine involves many types of steel, and the best vibration parameters are very different with different drawing speeds and surface quality requirements. SUMMARY
[0005] The present application aims to provide a crystallizer vibration control method, which optimizes the crystallizer vibration parameters in the continuous casting production process by dynamically adjusting the coupling control scheme of the crystallizer amplitude and the crystallizer frequency, while ensuring the normal demolding of the continuous casting billet and improving the surface quality of the continuous casting billet; effectively realizes the automatic optimization of the crystallizer vibration parameters, and can realize the dynamic optimization and adaptation of the model according to new production data, effectively solving the above problems existing in the background art.
[0006] The technical scheme of the present application is: a crystallizer vibration control method, comprising the following steps:
[0007] S1, setting the parameter combinations of all different steel grades, casting machine drawing speeds, crystallizer amplitudes and crystallizer frequencies during continuous casting production as different environments;
[0008] S2, setting a coupling adjustment control scheme of the crystallizer amplitude and the crystallizer frequency for all different environments;
[0009] S3, setting the expected returns of the different control schemes in all different environments which can be automatically updated subsequently;
[0010] S4, find the expected new environment after implementing all different control schemes under the current environment S0 of the caster, then randomly take scheme A with probability 1-Alpha: select the control scheme corresponding to the maximum expected return of all expected new environments as the next actual control scheme P, when there are multiple maximum values of the maximum expected return of all expected new environments, randomly select one of them; take scheme B with probability Alpha: randomly select any control scheme as the next actual control scheme P;
[0011] S5, keep the new environment S1 for 5 minutes after executing the control scheme P, and then calculate the current return I of the new environment;
[0012] S6, calculate the comprehensive return I of the new environment c ;
[0013] S7, update the expected return of executing the control scheme P under the environment S0;
[0014] S8, repeat the control process of S4-S7 until the optimal control state is reached.
[0015] In the step S1, the parameter setting method of the continuous variables of the casting speed, the mold amplitude and the mold vibration frequency is that the casting speed is from 0 m / min to the highest working speed, and each 0.1 m / min interval is regarded as a parameter; the mold amplitude is from 1 mm to 10 mm, and each 0.1 mm interval is regarded as a parameter; the mold vibration frequency is from 20 times / min to 300 times / min, and each 10 times / min interval is regarded as a parameter.
[0016] In the step S2, the total number of coupling adjustment control schemes is 9, which are the adjustment scheme combinations of the mold amplitude increasing by 0.1 mm, the mold amplitude decreasing by 0.1 mm, the mold amplitude remaining unchanged, and the mold vibration frequency increasing by 10 times / min, the mold vibration frequency decreasing by 10 times / min, and the mold vibration frequency remaining unchanged.
[0017] In the step S3, the expected return initialization value is wherein, I p is the expected return of a control scheme when the scheme is executed under the current environment, f is the mold vibration frequency under the new environment reached after executing the control scheme, the unit is times / min, h is the mold amplitude under the new environment reached after executing the control scheme, the unit is mm, and V is the current casting speed, the unit is m / min.
[0018] In the step S4, the value of Alpha is dynamically determined according to the following formula: f0 is the current mold vibration frequency, unit is times / min, h is the current mold amplitude, unit is mm, V is the current casting speed of the continuous casting machine, unit is m / min, and simultaneously, the maximum value of Alpha is limited to 0.1 and the minimum value is limited to 0.01.
[0019] In the step S5, the calculation method of the new environment current income I is that the new environment current income I is calculated as -10 if the billet sticking alarm occurs, and the new environment current income I is calculated as 0 if the billet sticking alarm does not occur. Wherein, I is the new environment current income, f0 is the new environment mold vibration frequency, unit is times / min, h is the new environment mold amplitude, unit is mm, V is the current casting speed of the continuous casting machine, unit is m / min.
[0020] In the step S6, the calculation method of the new environment comprehensive income I c is that I c = I + B x I n Wherein, I c is the new environment comprehensive income, I is the new environment current income, B is an experience value, and the value range is 0.7-0.9, and I n is the maximum value of the expected income of all different control schemes executed again under the new environment.
[0021] In the step S7, the update method of the expected income is that when the billet sticking alarm occurs during the new environment S1 maintaining period, when the billet sticking alarm does not occur during the new environment S1 maintaining period, Wherein, is the updated expected income, I p is the expected income before updating, I c is the new environment comprehensive income, and C is a steel grade surface quality coefficient, when the steel grade belongs to a high surface quality requirement steel grade, C=0.15 is taken, when the steel grade belongs to a medium surface quality requirement steel grade, C=0.1 is taken, and when the steel grade belongs to a low surface quality requirement steel grade, C=0.05 is taken.
[0022] The beneficial effects of the application are that the coupling control scheme of dynamically adjusting the mold amplitude and the mold vibration frequency is adopted to optimize the mold vibration parameters in the continuous casting production process, the normal billet demolding is ensured, the billet surface quality is improved, the automatic optimization of the mold vibration parameters is effectively realized, and the model dynamic optimization adaptation can be realized according to new production data. DETAILED DESCRIPTION
[0023] In order to make the purposes, technical solutions and advantages of the embodiments of the application clearer, the technical solutions in the embodiments of the application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments of the application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.
[0024] A mold vibration control method, comprising the following steps:
[0025] S1, setting all different steel grades, casting machine pulling speed, mold amplitude and mold vibration frequency parameter combinations during continuous casting production as different environments;
[0026] S2, setting a coupling adjustment control scheme of mold amplitude and mold vibration frequency for all different environments;
[0027] S3, setting a subsequent expected income that can be automatically updated for different control schemes in all different environments;
[0028] S4, under the current environment S0 of the casting machine, finding the expected new environment entered after implementing all different control schemes, then randomly taking scheme A with a probability of 1-Alpha: selecting the control scheme corresponding to the maximum expected income of all expected new environments as the next actual control scheme P, when there are multiple maximum values of the maximum expected income of all expected new environments, randomly selecting one of them; randomly taking scheme B with a probability of Alpha: randomly selecting any control scheme as the next actual control scheme P;
[0029] S5, after executing the control scheme P, entering a new environment S1 for 5 minutes, and then calculating the current income I of the new environment;
[0030] S6, calculating the comprehensive income I of the new environment c ;
[0031] S7, updating the expected income of executing the control scheme P under the environment S0;
[0032] S8, repeating the control process of S4-S7 until the optimal control state is reached.
[0033] In the step S1, the parameter setting method of the continuous variables of the casting machine pulling speed, the mold amplitude and the mold vibration frequency is that the casting machine pulling speed is from 0 m / min to the highest working pulling speed, and each 0.1 m / min interval is regarded as a parameter; the mold amplitude is from 1 mm to 10 mm, and each 0.1 mm interval is regarded as a parameter; and the mold vibration frequency is from 20 times / min to 300 times / min, and each 10 times / min interval is regarded as a parameter.
[0034] The step S2, coupling adjustment control scheme total 9 kinds, respectively, crystallizer amplitude increased 0.1mm, crystallizer amplitude decreased 0.1mm, crystallizer amplitude remains unchanged and crystallizer vibration frequency increased 10 times / min, crystallizer vibration frequency decreased 10 times / min and crystallizer vibration frequency adjustment scheme combination of amplitude and frequency remains unchanged.
[0035] The step S3, the expected income initialization value is Wherein, I p The expected income of a control scheme under the current environment, f is the crystallizer vibration frequency under the new environment reached after executing the control scheme, the unit is times / min, h is the crystallizer amplitude under the new environment reached after executing the control scheme, the unit is mm, V is the current casting speed of the continuous casting machine, the unit is m / min.
[0036] The step S4, the value of Alpha is dynamically determined according to the following formula: f0 is the current crystallizer vibration frequency, the unit is times / min, h is the current crystallizer amplitude, the unit is mm, V is the current casting speed of the continuous casting machine, the unit is m / min, at the same time, the maximum value of Alpha is limited to 0.1, and the minimum value is limited to 0.01.
[0037] The step S5, the calculation method of the new environment current income I is that if the billet sticking alarm occurs, the new environment current income I is calculated as-10, and if the billet sticking alarm does not occur, the new environment current income I is calculated as Wherein, I is the new environment current income, f0 is the new environment crystallizer vibration frequency, the unit is times / min, h is the new environment crystallizer amplitude, the unit is mm, V is the current casting speed of the continuous casting machine, the unit is m / min.
[0038] The step S6, the calculation method of the new environment comprehensive income I c Is: I c =I+B×I n , wherein I c The new environment comprehensive income, I is the new environment current income, B is the experience value, the value range is 0.7-0.9, I n The maximum value of the expected income of all different control schemes under the new environment.
[0039] The step S7, the updating method of the expected income is that when the billet sticking alarm occurs during the new environment S1 remains, When the billet sticking alarm does not occur during the new environment S1 remains, Wherein, The updated expected income, I pI is the expected income before updating, I c C is the comprehensive income of new environment, and C=0.15 when the steel grade belongs to high surface quality requirement steel grade, C=0.1 when the steel grade belongs to medium surface quality requirement steel grade, and C=0.05 when the steel grade belongs to low surface quality requirement steel grade.
[0040] In actual application, the method specifically comprises the following steps:
[0041] The first step is to set all different steel grades, casting machine pulling speeds, crystallizer amplitudes and crystallizer vibration frequencies during continuous casting production as different environments. The parameter setting method of the continuous variables of the casting machine pulling speed, the crystallizer amplitude and the crystallizer vibration frequency is that the casting machine pulling speed is from 0 m / min to the highest working pulling speed, and each 0.1 m / min interval is regarded as a parameter; the crystallizer amplitude is from 1 mm to 10 mm, and each 0.1 mm interval is regarded as a parameter; and the crystallizer vibration frequency is from 20 times / min to 300 times / min, and each 10 times / min interval is regarded as a parameter. The setting of the environment should include all different steel grades, casting machine pulling speeds, crystallizer amplitudes and crystallizer vibration frequencies during continuous casting production. The environment established in the embodiment is shown in the following table.
[0042] steel grade casting speed mould amplitude mould frequency environment 1 Q235 [0-0.1) [1-1.1) [20-30) environment 2 Q235 [0.1-0.2) [1-1.1) [20-30) environment 3 Q235 [0.2-0.3) [1-1.1) [20-30) …… environment 20 Q235 [1.9-2.0) [1-1.1) [20-30) environment 21 Q235 [0-0.1) [1.1-1.2) [20-30) environment 22 Q235 [0.1-0.2) [1.1-1.2) [20-30) …… ring n 700L [1.9-2.0) [9.9-10.0) [290-300)
[0043] The second step is to set the coupling adjustment control scheme of the crystallizer amplitude and the crystallizer vibration frequency for all different environments. The coupling adjustment control scheme is a total of 9 kinds, which are the adjustment scheme combinations of the crystallizer amplitude increasing 0.1 mm, the crystallizer amplitude decreasing 0.1 mm, the crystallizer amplitude remaining unchanged and the crystallizer vibration frequency increasing 10 times / min, the crystallizer vibration frequency decreasing 10 times / min, and the crystallizer vibration frequency remaining unchanged. The adjustment scheme in the embodiment is shown in the following table.
[0044]
[0045]
[0046] The third step is to set the expected income which can be automatically updated subsequently for different control schemes in all different environments. The expected income initialization value is wherein, I pis the expected benefit of the control scheme when the control scheme is executed in the current environment, f is the mold oscillation frequency in the new environment reached after the control scheme is executed, the unit is times / min, h is the mold oscillation amplitude in the new environment reached after the control scheme is executed, the unit is mm, V is the current casting speed of the continuous casting machine, the unit is m / min. For example, in the environment [steel grade: Q235, casting speed: 1.0, mold oscillation amplitude: 3, mold oscillation frequency: 200], when the control scheme [mold oscillation amplitude is increased by 0.1 mm, mold oscillation frequency remains unchanged] is used, the expected benefit is
[0047] The fourth step is to find the expected new environment reached after all different control schemes are implemented in the current environment S0 of the caster, and then randomly take scheme A with a probability of 1-Alpha: select the control scheme corresponding to the maximum expected benefit of all expected new environments as the next actual control scheme P, and when there are multiple maximum values of the maximum expected benefit of all expected new environments, randomly select one of them; randomly take scheme B with a probability of Alpha: randomly select any control scheme as the next actual control scheme P. The value of Alpha is dynamically determined according to the following formula: f0 is the current mold oscillation frequency, the unit is times / min, h is the current mold oscillation amplitude, the unit is mm, V is the current casting speed of the continuous casting machine, the unit is m / min, at the same time, the maximum value of Alpha is limited to 0.1, and the minimum value is limited to 0.01. For example, in the current environment [steel grade: Q235, casting speed: 1.0, mold oscillation amplitude: 3, mold oscillation frequency: 200], A random number in the range of 0-1 is generated by the system, and in this embodiment, the random number for this calculation is 0.0215. Since 0.0215<0.0493, scheme B is taken, that is, any control scheme is randomly selected as the next actual control scheme P, and in this calculation, the control scheme [mold oscillation amplitude is increased by 0.1 mm, mold oscillation frequency remains unchanged] is randomly selected for actual control.
[0048] The fifth step is to enter a new environment S1 after the control scheme P is executed for 5 minutes, and then calculate the current benefit I of the new environment. For example, in the last step of this embodiment, after the control scheme P is executed, the new environment S1 entered is [steel grade: Q235, casting speed: 1.0, mold oscillation amplitude: 3.1, mold oscillation frequency: 200]. The calculation method of the current benefit I of the new environment is that if the billet sticking alarm occurs, the current benefit I of the new environment is calculated as -10, and if the billet sticking alarm does not occur, the current benefit I of the new environment is calculated as Where I is the current benefit of the new environment, f0 is the mold vibration frequency of the new environment, in beats / min, h is the mold amplitude of the new environment, in mm, and V is the current casting speed of the continuous casting machine, in m / min. If the casting machine generates a strand sticking alarm while maintaining the new environment S1 in this embodiment, the current benefit I of the new environment S1 is -10.
[0049] Step 6: Calculate the comprehensive benefits of the new environment I c The comprehensive benefits of the new environment I c The calculation method is: I c =I+B×I n , where I c is the comprehensive benefit of the new environment, I is the current benefit of the new environment, B is the experience value, ranging from 0.7 to 0.9, I n The maximum value of the expected benefits of executing all different control schemes in the new environment S1. n is -0.444, comprehensive income I c For I c =-10+0.8×-0.444=-10.3552.
[0050] Step 7: Update the expected benefit of executing the control scheme P under the environment S0. The method for updating the expected benefit is that when the billet sticking alarm occurs during the maintenance of the new environment S1, If no billet sticking alarm occurs during the new environment S1, in, is the updated expected return, I p is the expected return before updating, I c is the comprehensive benefit of the new environment, C is the surface quality coefficient of the steel grade, when the steel grade has high surface quality requirements, take C = 0.15, when the steel grade has medium surface quality requirements, take C = 0.1, when the steel grade has low surface quality requirements, take C = 0.05. If the casting machine has a billet sticking alarm during the maintenance of the new environment S1 in this embodiment, then
[0051] Step 8. Repeat the control process from step 4 to step 7.
[0052] This invention optimizes mold vibration parameters during continuous casting by dynamically adjusting the coupled control scheme of mold amplitude and frequency, while ensuring proper mold release and improving the surface quality of the cast strands. This method adapts the control scheme to the environment and achieves the optimal control scheme through dynamic optimization, simultaneously improving the stability of continuous casting production and ensuring the surface quality of the cast strands.
[0053] The present application effectively solves the problem that the complicated parameters required for adjusting the crystallizer vibration are difficult to explore in actual production and require a large amount of time and cost in the background art. The automatic optimization of the crystallizer vibration parameters is effectively realized, and the model can be dynamically optimized and adapted according to new production data.
Claims
1. A crystallizer vibration control method, characterized in that The following steps are involved: S1. Set the parameter combinations of all different steel grades, casting machine speed, mold amplitude and mold vibration frequency during continuous casting production into different environments; S2. Setting the coupled adjustment control scheme of the mold amplitude and the mold frequency for all different environments; S3. Set expected benefits that can be automatically updated later for different control schemes in all different environments; S4. Under the current environment S0 of the casting machine, find the expected new environment after implementing all different control schemes. Then, randomly adopt scheme A with probability 1-Alpha: select the control scheme corresponding to the maximum expected benefit of all expected new environments as the next actual control scheme P. If there are multiple identical maximum expected benefits of all expected new environments, randomly select one of them. Randomly adopt scheme B with probability Alpha: randomly select any control scheme as the next actual control scheme P. S5: After executing the control plan P, enter the new environment S1 and stay there for 5 minutes, then calculate the current income I of the new environment; S6. Calculate the comprehensive benefits of the new environment I c ; S7, update the expected benefits of executing the control scheme P under the environment S0; S8. Repeat the control process of S4-S7 until the optimal control state is reached.
2. A crystallizer vibration control method according to claim 1, characterized in that: In step S1, the parameter setting method of the continuous variables such as the casting machine pulling speed, the crystallizer amplitude and the crystallizer vibration frequency is as follows: the casting machine pulling speed ranges from 0 m / min to the maximum working pulling speed, and each 0.1 m / min interval is regarded as a parameter; the crystallizer amplitude ranges from 1 mm to 10 mm, and each 0.1 mm interval is regarded as a parameter; the crystallizer vibration frequency ranges from 20 times / min to 300 times / min, and each 10 times / min interval is regarded as a parameter.
3. A crystallizer vibration control method according to claim 1, characterized in that: In step S2, there are a total of 9 coupling adjustment control schemes, namely, the amplitude and frequency adjustment scheme combinations of increasing the crystallizer amplitude by 0.1 mm, decreasing the crystallizer amplitude by 0.1 mm, keeping the crystallizer amplitude unchanged, increasing the crystallizer frequency by 10 times / min, decreasing the crystallizer frequency by 10 times / min, and keeping the crystallizer frequency unchanged.
4. A crystallizer vibration control method according to claim 1, characterized in that: In step S3, the expected return is initialized to Among them, I p is the expected benefit of a certain control scheme when it is executed in the current environment, f is the mold vibration frequency in the new environment reached after the control scheme is executed, in times / min, h is the mold amplitude in the new environment reached after the control scheme is executed, in mm, and V is the current casting speed of the continuous casting machine, in m / min.
5. A crystallizer vibration control method according to claim 1, characterized in that: In step S4, the value of Alpha is dynamically determined according to the following formula: f0 is the current crystallizer vibration frequency, in times / min, h is the current crystallizer amplitude, in mm, V is the current casting speed of the continuous casting machine, in m / min. At the same time, the maximum value of Alpha is limited to 0.1 and the minimum value is limited to 0.
01.
6. A crystallizer vibration control method according to claim 1, characterized in that: In step S5, the current benefit I of the new environment is calculated as follows: if the billet sticking alarm occurs, the current benefit I of the new environment is calculated as -10; if the billet sticking alarm does not occur, the current benefit I of the new environment is calculated as Among them, I is the current gain of the new environment, f0 is the vibration frequency of the crystallizer in the new environment, the unit is times / min, h is the amplitude of the crystallizer in the new environment, the unit is mm, and V is the current casting speed of the continuous casting machine, the unit is m / min.
7. A crystallizer vibration control method according to claim 1, characterized in that: In step S6, the comprehensive benefit of the new environment I c The calculation method is: I c =I+B×I n , where I c is the comprehensive benefit of the new environment, I is the current benefit of the new environment, B is the experience value, ranging from 0.7 to 0.9, I n It is the maximum value of the expected benefits of executing all different control schemes in the new environment.
8. A crystallizer vibration control method according to claim 1, characterized in that: In step S7, the expected profit is updated in the following way: when a billet sticking alarm occurs during the maintenance of the new environment S1, If no billet sticking alarm occurs during the new environment S1, in, is the updated expected return, I p is the expected return before updating, I c is the comprehensive benefit of the new environment, C is the surface quality coefficient of the steel grade, when the steel grade has high surface quality requirements, take C = 0.15, when the steel grade has medium surface quality requirements, take C = 0.1, when the steel grade has low surface quality requirements, take C = 0.05.