Steel coil acid-transfer continuous rolling production process control method

Abstract

The invention belongs to the technical field of steel rolling, and provides a steel coil acid conversion continuous rolling production process control method which comprises the following steps: firstly, arranging a sensor at a proper position of a steel coil production line; the emulsion is accurately regulated and controlled, and the rolling force is reduced; an anti-collapse winding sleeve is arranged at the position of a winding machine; then, the roller is subjected to preheating treatment; setting rolling parameters; secondly, a steel coil is pre-produced, and the thermal convexity is stabilized; meanwhile, tension is adjusted, and production is started; the tension is adjusted in time according to the production condition; and automatic equipment is used for monitoring in real time in the whole process, and the production process is controlled in real time.

Description

Technical Field

[0001] The invention belongs to the technical field of steel rolling, in particular to a method for controlling the production process of steel coil acid transfer and continuous rolling. Background Art

[0002] In the field of steel production, the market demand for specific grades of steel coils is constantly changing; currently, there are many difficulties in the production of XS02 / XS02A grade steel coils in a single stand; the manufacturing cost of single-stand production is significantly higher than that of acid rolling, mainly because the energy consumption and maintenance costs of single-stand equipment are high, and the production efficiency is low; at the same time, a single stand only uses one stand for production, and there are many round-trip production passes, resulting in a shift output of only 9-11 coils, which is difficult to meet the large order volume demand of customers, which not only affects the economic benefits of the enterprise, but also may cause the disconnection of production of other products and disrupt the entire production plan; in addition, due to the limitations of the single-stand production process, the product quality compliance rate of this grade of steel coil is low, which is at a disadvantage in market competition, and seriously restricts its market benefits and product competitiveness; therefore, it is crucial to develop an effective process control method for converting XS02 / XS02A steel coils to acid continuous rolling production;

[0003] To this end, the present invention provides a method for controlling the production process of steel coil acid transfer and continuous rolling. Summary of the invention

[0004] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] In a first aspect, the present invention provides a method for controlling a steel coil acid transfer and continuous rolling production process, comprising:

[0007] S1: Arrange sensors at appropriate locations on the steel coil production line;

[0008] S2: Precisely control the emulsion to reduce rolling force;

[0009] S3: Equip the coiler with an anti-collapse sleeve;

[0010] S4: preheating the roller;

[0011] S5: rolling parameter setting;

[0012] S6: Pre-production of steel coils, stabilization of thermal crown;

[0013] S7: Adjust the tension and start production; and adjust the tension in time according to the production situation;

[0014] S8: Use automated equipment to monitor the entire process in real time and control the production process in real time.

[0015] In a second aspect, the present invention provides a production process control system for steel coil transfer acid continuous rolling, including:

[0016] Real-time monitoring equipment installation module: Install real-time monitoring equipment required for production at appropriate positions on the steel coil production line;

[0017] Emulsion parameter precise regulation module: Precisely regulate the emulsion parameters. When the liquid saponification value reaches 165, it can effectively reduce the friction between the roll and the steel coil, reduce the rolling force, and use an online refractometer to monitor the liquid saponification value in real time to ensure that the liquid saponification value is stable at 165, thereby extending the service life of the roll;

[0018] Ensure that the emulsion concentration is stable above 3% to provide sufficient effective components for lubrication and cooling; at the same time, strictly control the emulsion temperature between 50 - 55 °C; use an infrared temperature sensor to monitor in real time to ensure that the emulsion temperature ≥ 40 °C when refueling to prevent emulsion demulsification caused by too low oil temperature;

[0019] Sleeve configuration module: Prepare sleeves of corresponding specifications according to the different thicknesses of the steel coils; for steel coils with a thickness less than 0.35 mm, because the inner ring is prone to instability and collapse during coiling, a special sleeve needs to be added to the inner ring;

[0020] Roll preheating treatment module: Set the heating rate of the preheating equipment to 5 °C per minute and start heating the roll; when the roll temperature rises to 100 °C, maintain this temperature for 30 minutes to ensure uniform heating of all parts of the roll; after 30 minutes, adjust the heating rate to 10 °C per minute and continue heating the roll; when the roll temperature reaches the target working temperature between 200 - 250 °C, stop heating and let the roll maintain this temperature for 15 minutes to make the internal structure of the roll fully stable and allow the heat to be evenly and stably transferred to the roll core part to avoid thermal stress concentration;

[0021] Rolling parameter optimization setting module: For the production of steel coils with a raw material thickness between 5 - 2.3 mm and a width between 1185 - 1245 mm, as Figure 4 shown, the present invention scientifically sets the outlet thickness and reduction ratio of the 1st to 5th stands through a large amount of production experience; the outlet thicknesses of the 1st to 5th stands are set to 1.55 mm, 0.976 mm, 0.621 mm, 0.442 mm, and 0.35 mm respectively, and the corresponding reduction ratios are 32.6%, 37.1%, 36.3%, 28.9%, and 20.8% in sequence; at the same time, set the tensions of the 1st to 4th stands to 110 KN, 120 KN, 130 KN, and 140 KN respectively. Through precise tension control, keep the steel coil in a stable running state during rolling to prevent defects such as deviation and tearing;

[0022] Pre-production module: First, produce 2 coils of W600 or W470 steel coils; by pre-producing these 2 coils, the rolls can gradually adapt to the rolling working conditions and stabilize the thermal crown of the rolls; at the same time, during the production process, use the roll thermal crown monitoring system to measure the roll thermal crown every 1 minute; when the measurement results show that the fluctuation range of the roll thermal crown is within ±0.02 mm for 3 consecutive times, it is determined that the roll thermal crown reaches a stable state; after the thermal crown reaches a stable state, switch to produce XS02 steel coils, so as to ensure the dimensional accuracy and surface quality of XS02 steel coils during the rolling process and avoid product defects caused by unstable roll thermal crown;

[0023] Tension fine-tuning module: When producing XS02 steel coils, due to the complex force on the edges, edge curling is likely to occur; according to a large amount of previous production data and experimental research, it is necessary to re-adjust the dynamic tension;

[0024] The present invention re-sets the tension of the 1st to 4th stands; the tensions of the 1st to 4th stands are respectively set to 135 KN, 140 KN, 150 KN and 170 KN; by increasing the tension, change the stress distribution at the edges of the steel coils and effectively suppress the tendency of edge curling; at the same time, during the rolling process, use a thickness gauge to monitor the edge state of the steel coils in real time. Once signs of edge curling are found, immediately fine-tune the tension to ensure that the edge quality of the steel coils meets the requirements;

[0025] Use the edge quality detection equipment installed at the exit of the rolling mill to monitor the edge state of the steel coils in real time; the edge quality detection equipment measures the edge curling amount of the steel coils every 5 seconds; when the detected edge curling amount exceeds 0.5 mm, fine-tune the tension of the 1st to 4th stands according to the set tension adjustment strategy; each time of fine-tuning, increase the tension step by step in units of 5 KN. For example, increase the tension of the 1st stand from the current value to 140 KN, the tension of the 2nd stand to 145 KN, the tension of the 3rd stand to 155 KN, and the tension of the 4th stand to 175 KN;

[0026] After adjusting the tension, first produce a 5-meter steel coil, and then use the edge quality detection equipment to detect the edge curling amount of the steel coil again; if the curling amount still exceeds 0.2 mm, continue to fine-tune according to the above adjustment strategy until the curling amount is controlled within 0.2 mm;

[0027] Real-time monitoring system module: During the whole production process, use a well-established real-time monitoring system to collect various process parameters in real time through an on-line refractometer, an infrared temperature monitoring instrument, a roll preheating device, and a thickness gauge; and compare and analyze them with the preset process parameters; ensure that the production process strictly meets the process requirements.

[0028] The beneficial effects of the present invention are as follows: The core objective of the present invention is to solve the problems of high manufacturing cost, low output, and low quality compliance rate existing in the production of steel coils of XS02 / XS02A grades on a single stand; by optimizing the production process control method of tandem cold rolling, the goals of reducing production costs, significantly increasing output, and remarkably improving product quality are achieved, thereby enhancing the comprehensive competitiveness of this grade of steel coils in the market. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be further described below with reference to the accompanying drawings.

[0030] Figure 1 is the process flow chart of a production process control method for converting steel coils to tandem cold rolling according to the present invention;

[0031] Figure 2 is the system module diagram of a production process control system for converting steel coils to tandem cold rolling according to the present invention;

[0032] Figure 3 is the schematic diagram of production using 1 stand in Example 2;

[0033] Figure 4 is the schematic diagram of production using 5 stands simultaneously in Example 2. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] In order to make the technical means, creative features, achieved objectives, and functions of the present invention easy to understand, the present invention will be further elaborated below in conjunction with specific embodiments.

[0035] Example 1

[0036] As Figure 1 shown, a production process control method for converting steel coils to tandem cold rolling according to an embodiment of the present invention includes:

[0037] S1: Install an on-line refractometer at the emulsion supply device for real-time monitoring of the liquid saponification value; arrange infrared temperature monitoring instruments for real-time monitoring of the temperature at each link of the production line; arrange a roll preheating device for facilitating the preheating of the rolls; arrange a roll thermal crown monitoring system for real-time monitoring of the roll thermal crown; install thickness gauges at the outlet and inlet of the rolling mill for real-time monitoring of the production situation of the steel coils; install edge quality detection equipment at the outlet of the rolling mill for real-time monitoring of the quality problems of the steel coils;

[0038] S2: Precisely regulate the emulsion parameters. The emulsion plays a key role in lubricating and cooling the rolls and the steel coils during the rolling process; the present invention requires the emulsion saponification value to accurately reach 165. When the liquid saponification value reaches 165, it can effectively reduce the friction between the rolls and the steel coils, reduce the rolling force, use the on-line refractometer to monitor the liquid saponification value in real time, and determine that the liquid saponification value is stable at 165 to extend the service life of the rolls;

[0039] In addition, by regularly detecting and adding specific additives, ensure that the concentration of the emulsion is stabilized above 3%, providing sufficient effective ingredients for lubrication and cooling; at the same time, strictly control the temperature of the emulsion between 50 - 55°C. This temperature range can not only ensure the stable performance of the emulsion but also enable the steel coil to maintain good plasticity during the rolling process;

[0040] During the oiling process, use an infrared temperature sensor to monitor in real time to ensure that the emulsion temperature is ≥40°C when oiling, preventing the emulsion from demulsifying due to too low oil temperature and affecting its performance;

[0041] S3: Preparation for sleeve specification adaptation. At the coiler, equip an anti-collapse sleeve;

[0042] Prepare sleeves of corresponding specifications according to the different thicknesses of the steel coils; for steel coils with a thickness less than 0.35mm, because their inner rings are prone to instability and collapse during coiling, special sleeves need to be added to the inner rings;

[0043] Specifically, this kind of sleeve is made of high-strength and high-toughness materials. Its inner diameter fits tightly with the inner ring of the steel coil, and its outer diameter fits with the coiler mandrel. It can not only effectively increase the supporting force of the inner ring of the steel coil, prevent the occurrence of coil collapse, ensure the integrity and quality of the steel coil coiling, but also facilitate subsequent transportation and coiling;

[0044] S4: Roll preheating treatment. Before production, use a roll preheating device to preheat the rolls; the preheating process follows a pre-established preheating temperature rise curve. First, raise the roll temperature to a certain extent at a slower speed to make the internal structure of the rolls uniformly heated and avoid thermal stress concentration;

[0045] Specifically, first start the roll preheating program, set the heating rate of the preheating equipment to 5°C per minute, and start heating the rolls; when the roll temperature rises to 100°C, maintain this temperature for 30 minutes. The purpose is to make the temperature evenly transfer from the roll surface to the roll core part to prevent the rolls from generating large thermal deformations; during this period, use an infrared thermometer to measure the temperature at different positions on the roll surface every 1 minute to ensure that all parts of the rolls are evenly heated and the temperature difference does not exceed ±5°C; after 30 minutes, adjust the heating rate to 10°C per minute and continue to heat the rolls; when the roll temperature reaches the target working temperature between 200 - 250°C, stop heating and let the rolls maintain at this temperature for 15 minutes to make the internal structure of the rolls fully stable and allow the heat to be evenly and stably transferred to the roll core part to avoid thermal stress concentration;

[0046] Then, according to the material and size of the roll, adjust the heating rate, gradually raise the roll temperature to the appropriate working temperature, and stabilize the thermal crown of the roll; the preheated roll can better adapt to the rolling force and temperature changes during the initial stage of rolling, reduce roll wear and deformation, and improve rolling accuracy and product surface quality;

[0047] During the entire preheating process, an infrared thermometer monitors the entire preheating process in real time. Once abnormal temperature fluctuations or the preheating temperature rise curve deviates from the predetermined requirements are detected, immediately adjust the preheating equipment to ensure a steady rise in temperature during the roll preheating process and prevent excessive concentration of thermal stress;

[0048] S5: Optimized setting of rolling parameters. For the production of steel coils with a raw material thickness between 5 - 2.3 mm and a width between 1185 - 1245 mm, as Figure 4 shown, the present invention scientifically sets the exit thickness and reduction ratio of the 1st to 5th stands through a large amount of production experience; the exit thicknesses of the 1st to 5th stands are set to 1.55 mm, 0.976 mm, 0.621 mm, 0.442 mm, and 0.35 mm respectively, and the corresponding reduction ratios are 32.6%, 37.1%, 36.3%, 28.9%, and 20.8% in sequence;

[0049] This distribution of thickness and reduction ratio is based on a comprehensive consideration of the material properties of the steel coil, the performance of the rolling mill, and the product quality requirements, as well as a large number of historical production records, which can ensure that the steel coil is gradually deformed between stands and the deformation is uniform, guaranteeing the dimensional accuracy and internal quality of the product;

[0050] Meanwhile, set the tensions of the 1st to 4th stands to 110 KN, 120 KN, 130 KN, and 140 KN respectively. Through precise tension control, keep the steel coil in a stable running state during rolling and prevent defects such as deviation and cracking;

[0051] S6: Fine operation of starting control. After changing the roll and starting up in the process, first produce 2 coils of W600 or W470 steel coils; by pre-producing these 2 coils of steel coils, the roll can gradually adapt to the rolling working conditions and stabilize the thermal crown of the roll; meanwhile, during the production process, use the roll thermal crown monitoring system to measure the roll thermal crown once every 1 minute; when the measurement results show that the fluctuation range of the roll thermal crown is within ±0.02 mm for 3 consecutive times, it is determined that the roll thermal crown reaches a stable state; after the thermal crown reaches a stable state, then switch to produce XS02 steel coils, thereby ensuring the dimensional accuracy and surface quality of XS02 steel coils during rolling and avoiding product defects caused by unstable roll thermal crown;

[0052] The technical solution of this embodiment is as follows: By arranging instruments at appropriate positions on the production line, the preheating process of the roll is monitored in real time; the surface of the roll is monitored in real time during the preheating process through an infrared temperature sensor, and the real-time temperature is compared with the preheating temperature rise curve. Once abnormal temperature fluctuations or the preheating temperature rise curve deviates from the predetermined requirements are found, the preheating equipment is immediately adjusted to prevent thermal stress concentration caused by uneven heating of the roll; in addition, when the temperature rises to a specific temperature, it will stay for a specific period of time to allow the heat to be evenly transferred from the roll surface to the roll core and prevent too large a temperature difference between the roll surface and the roll core; furthermore, through the pre-production method, the thermal crown of the roll is kept in a stable state;

[0053] Embodiment 2

[0054] As Figure 1 shown, a method for controlling a steel coil tandem cold rolling production process according to an embodiment of the present invention further includes:

[0055] S7: When producing XS02 steel coils, due to the complex stress on the edges, edge warping is likely to occur; according to a large amount of previous production data and experimental research, it is necessary to re-adjust the tension dynamics;

[0056] The present invention re-sets the tension of the 1st to 4th stands; as Figure 4 shown, the tensions of the 1st to 4th stands are respectively set to 135 KN, 140 KN, 150 KN and 170 KN; by increasing the tension, the stress distribution on the edges of the steel coil is changed to effectively suppress the edge warping trend; meanwhile, during the rolling process, a thickness gauge is used to monitor the edge state of the steel coil in real time. Once signs of edge warping are found, the tension is immediately fine-tuned to ensure that the quality of the steel coil edges meets the requirements;

[0057] During the rolling process of the first 3 steel coils after switching production, the operator needs to closely monitor the data fed back by the roll thermal crown monitoring system and the thickness gauge;

[0058] An edge quality detection device installed at the exit of the rolling mill is used to monitor the edge state of the steel coil in real time; the edge quality detection device measures the edge warping amount of the steel coil every 5 seconds; when the detected edge warping amount exceeds 0.5 mm, the tensions of the 1st to 4th stands are fine-tuned according to the set tension adjustment strategy; each time during fine-tuning, the tension is gradually increased in units of 5 KN. For example, the tension of the 1st stand is increased from the current value to 140 KN, the tension of the 2nd stand is increased to 145 KN, the tension of the 3rd stand is increased to 155 KN, and the tension of the 4th stand is increased to 175 KN;

[0059] After adjusting the tension, first produce a 5-meter steel coil, and then use the edge quality detection device to detect the edge warping amount of the steel coil again; if the warping amount still exceeds 0.2 mm, continue to fine-tune according to the above adjustment strategy until the warping amount is controlled within 0.2 mm;

[0060] During the entire tension adjustment process, the operator needs to pay close attention to the feedback data from the edge quality detection equipment and the rolling conditions of the steel coil to ensure a good tension adjustment effect and avoid problems such as steel coil cracking due to excessive tension.

[0061] In the prior art, Figure 3 As shown in the figure, one rack is used for production. Due to the large number of round trips, the output during the shift is only 9 to 11 rolls, and the production efficiency is low. This situation cannot meet the customer's demand for large orders, and it is easy to cause the production progress of other products to be out of sync during the production process. As an improvement to the existing technology, Figure 4 As shown in the figure, 5 racks are used for simultaneous production; this improvement method can significantly shorten the production time of a single coil; after actual verification, compared with using 1 rack to produce a single coil of steel coil with the same quality, using 5 racks to produce a single coil of steel coil can save 31 minutes and 30 seconds of production time, greatly improving production efficiency;

[0062] S8: During the entire production process, a complete real-time monitoring system is established to collect various process parameters in real time through online refractometers, infrared temperature monitoring instruments, roll preheating devices, and thickness gauges; and compare and analyze with the preset process parameters to ensure that the production process strictly meets the process requirements;

[0063] The technical solution of this embodiment is: by resetting the tension of the 1-4 racks, the stress distribution of the edge of the steel coil is changed, and the edge warping trend is effectively suppressed; at the same time, the edge quality detection equipment is monitored in real time. When it is detected that the edge warping exceeds 0.5mm, the tension is fine-tuned according to the set strategy, and it is detected again after adjustment until the warping is controlled within 0.2mm, ensuring the high quality of the product; the production of 1 rack is changed to 5 racks at the same time, which significantly shortens the production time of a single coil. Compared with the production of a single rack, the production of a single coil of steel coil using 5 racks can save 31 minutes and 30 seconds, greatly improving production efficiency, meeting customers' demand for large orders, and avoiding the disconnection of the production progress of other products; at the same time, a variety of monitoring equipment is used to control the entire production process and production technology in real time;

[0064] Example 3

[0065] Based on Example 1 and Example 2, the present invention provides a steel coil acid transfer and continuous rolling production process control system, including:

[0066] Real-time monitoring device installation module: Install an online refractometer at the emulsion supply device to monitor the liquid saponification value in real time; arrange an infrared temperature monitoring instrument to monitor the temperature of each production line link in real time; arrange a roll preheating device to facilitate the preheating of the rolls; arrange a roll thermal crown monitoring system to monitor the roll thermal crown in real time; install thickness gauges at the outlet and inlet of the rolling mill to monitor the production of the steel coil in real time; install edge quality inspection equipment at the outlet of the rolling mill to monitor the quality problems of the steel coil in real time;

[0067] Precise regulation module for emulsion parameters: Precisely regulate the emulsion parameters. The emulsion plays a key role in lubricating and cooling the rolls and the steel coil during the rolling process; the present invention requires that the saponification value of the emulsion accurately reaches 165. When the liquid saponification value reaches 165, it can effectively reduce the friction between the roll and the steel coil, reduce the rolling force, and use an online refractometer to monitor the liquid saponification value in real time to determine that the liquid saponification value is stable at 165, thereby extending the service life of the roll;

[0068] In addition, by regularly detecting and adding specific additives, ensure that the emulsion concentration is stable above 3% to provide sufficient effective components for lubrication and cooling; at the same time, strictly control the emulsion temperature between 50 - 55 °C. This temperature range can not only ensure the stable performance of the emulsion but also enable the steel coil to maintain good plasticity during the rolling process;

[0069] During the refueling process, use an infrared temperature sensor to monitor in real time to ensure that the emulsion temperature ≥ 40 °C during refueling to prevent the emulsion from demulsifying due to too low oil temperature and affecting its performance;

[0070] Sleeve configuration module: Prepare sleeves of corresponding specifications according to the different thicknesses of the steel coils; for steel coils with a thickness less than 0.35 mm, because the inner ring is prone to instability and collapse during coiling, a special sleeve needs to be added to the inner ring;

[0071] Specifically, this kind of sleeve is made of high-strength and high-toughness materials. Its inner diameter fits closely with the inner ring of the steel coil, and its outer diameter matches the coiler mandrel. It can not only effectively increase the support force of the inner ring of the steel coil, prevent the occurrence of coil collapse, ensure the integrity and quality of the steel coil coiling, but also facilitate subsequent transportation and coiling;

[0072] Roll preheating treatment module: First, start the roll preheating program, set the heating rate of the preheating equipment to 5°C per minute, and start heating the roll; when the roll temperature rises to 100°C, maintain this temperature for 30 minutes. The purpose is to make the temperature evenly transfer from the roll surface to the roll core part to prevent large thermal deformation of the roll; during this period, use an infrared thermometer to measure the temperature at different positions on the roll surface every 1 minute to ensure that each part of the roll is evenly heated and the temperature difference does not exceed ±5°C; after 30 minutes, adjust the heating rate to 10°C per minute and continue to heat the roll; when the roll temperature reaches the target working temperature between 200 - 250°C, stop heating and let the roll maintain at this temperature for 15 minutes to fully stabilize the internal structure of the roll and make the heat evenly and stably transfer to the roll core part to avoid thermal stress concentration;

[0073] Then, according to the material and size of the roll, adjust the heating speed, gradually raise the roll temperature to the appropriate working temperature, and stabilize the thermal crown of the roll; the preheated roll can better adapt to the rolling force and temperature changes during the initial stage of rolling, reduce roll wear and deformation, and improve the rolling accuracy and product surface quality;

[0074] During the entire preheating process, the infrared thermometer monitors the entire preheating process in real time. Once it detects abnormal temperature fluctuations or the preheating heating curve deviates from the predetermined requirements, immediately adjust the preheating equipment to ensure that the temperature rises steadily during the roll preheating process and prevent excessive thermal stress concentration;

[0075] Rolling parameter optimization and setting module: For the production of steel coils with a raw material thickness between 5 - 2.3 mm and a width between 1185 - 1245 mm, the present invention scientifically sets the outlet thickness and reduction ratio of the 1st to 5th stands through a large amount of production experience; the outlet thicknesses of the 1st to 5th stands are set to 1.55 mm, 0.976 mm, 0.621 mm, 0.442 mm, and 0.35 mm respectively, and the corresponding reduction ratios are 32.6%, 37.1%, 36.3%, 28.9%, and 20.8% in sequence;

[0076] This distribution of thickness and reduction ratio is based on a comprehensive consideration of the material properties of the steel coil, the performance of the rolling mill, and the product quality requirements, as well as a large number of historical production records, which can ensure that the steel coil is gradually deformed between stands and the deformation is uniform, guaranteeing the dimensional accuracy and internal quality of the product;

[0077] At the same time, set the tensions of the 1st to 4th stands to 110 KN, 120 KN, 130 KN, and 140 KN respectively. Through precise tension control, make the steel coil maintain a stable running state during rolling and prevent defects such as deviation and tearing;

[0078] Pre - production module: First, produce 2 coils of W600 or W470 steel coils; by pre - producing these 2 coils, the roll can gradually adapt to the rolling working conditions, stabilizing the thermal crown of the roll; meanwhile, during the production process, use the roll thermal crown monitoring system to measure the roll thermal crown every 1 minute; when the measurement results show that the fluctuation range of the roll thermal crown is within ±0.02 mm for 3 consecutive times, it is determined that the roll thermal crown reaches a stable state; after the thermal crown reaches a stable state, then switch to produce XS02 steel coils, so as to ensure the dimensional accuracy and surface quality of XS02 steel coils during the rolling process, and avoid product defects caused by unstable roll thermal crown;

[0079] Tension fine - tuning module: When producing XS02 steel coils, due to the complex force on the edges, edge - warping phenomena are likely to occur; according to a large amount of previous production data and experimental research, it is necessary to re - adjust the dynamic tension;

[0080] The present invention re - sets the tension of the 1st to 4th stands; the tensions of the 1st to 4th stands are set to 135 KN, 140 KN, 150 KN, and 170 KN respectively; by increasing the tension, change the stress distribution at the edges of the steel coil, effectively suppressing the edge - warping trend; meanwhile, during the rolling process, use a thickness gauge to monitor the edge state of the steel coil in real - time. Once signs of edge - warping are found, immediately fine - tune the tension to ensure that the edge quality of the steel coil meets the requirements;

[0081] During the rolling process of the first 3 coils after switching production, the operator needs to closely monitor the data fed back by the roll thermal crown monitoring system and the thickness gauge;

[0082] Use the edge quality detection equipment installed at the exit of the rolling mill to monitor the edge state of the steel coil in real - time; the edge quality detection equipment measures the edge - warping amount of the steel coil every 5 seconds; when the detected edge - warping amount exceeds 0.5 mm, fine - tune the tension of the 1st to 4th stands according to the set tension adjustment strategy; each time of fine - tuning, increase the tension step by step in units of 5 KN. For example, increase the tension of the 1st stand from the current value to 140 KN, the tension of the 2nd stand to 145 KN, the tension of the 3rd stand to 155 KN, and the tension of the 4th stand to 175 KN;

[0083] After adjusting the tension, first produce a 5 - meter steel coil, and then use the edge quality detection equipment to detect the edge - warping amount of the steel coil again; if the edge - warping amount still exceeds 0.2 mm, continue to fine - tune according to the above - mentioned adjustment strategy until the edge - warping amount is controlled within 0.2 mm;

[0084] Real-time monitoring system module: During the entire production process, a well-established real-time monitoring system is utilized to collect various process parameters in real time through an online refractometer, an infrared temperature monitoring instrument, a roll preheating device, and a thickness gauge; and compare and analyze them with the preset process parameters; to ensure that the production process strictly complies with the process requirements;

[0085] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only to illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A method for controlling the production process of steel coil acid transfer and continuous rolling, characterized in that: include: S1: Arrange sensors at appropriate locations on the steel coil production line; S2: Precisely control the emulsion to reduce rolling force; S3: Equip the coiler with an anti-collapse sleeve; S4: preheating the roller; S5: rolling parameter setting; S6: Pre-production of steel coils, stabilization of thermal crown; S7: Adjust the tension and start production; and adjust the tension in time according to the production situation; S8: Use automated equipment to monitor the entire process in real time and control the production process in real time.

2. The method for controlling the production process of steel coil acid transfer and continuous rolling according to claim 1, characterized in that: The specific parameters for precise control of the emulsion are as follows: the present invention requires that the saponification value of the emulsion accurately reaches 165, and ensures that the concentration of the emulsion is stable at more than 3%, and the temperature of the emulsion is strictly controlled between 50-55°C.

3. The method for controlling the production process of steel coil acid transfer and continuous rolling according to claim 1, characterized in that: The specific process of equipping the coil-collapse prevention sleeve at the coiler is as follows: sleeves of corresponding specifications are prepared according to the different thicknesses of the steel coils; for steel coils with a thickness of less than 0.35 mm, the inner ring is prone to instability and collapse during the coiling process, and a special sleeve needs to be added to the inner ring.

4. The method for controlling the production process of steel coil acid transfer and continuous rolling according to claim 1, characterized in that: The specific process of preheating the roller is as follows: preheating the roller by using a roller preheating device; the preheating process follows a pre-set preheating temperature rise curve.

5. The method for controlling the production process of steel coil acid transfer and continuous rolling according to claim 4, characterized in that: The roller preheating device is used to preheat the roller; the specific process of the preheating process following the preheating temperature rise curve set in advance is: the heating rate of the preheating device is set to 5°C / minute, and the roller is started to be heated; when the roller temperature rises to 100°C, the temperature is maintained for 30 minutes, the purpose is to evenly transfer the temperature from the roller surface to the roller core part, after 30 minutes, the heating rate is adjusted to 10°C / minute, and the roller is continued to be heated; when the roller temperature reaches the target operating temperature between 200-250°C, the heating is stopped, and the roller is kept at this temperature for 15 minutes, so that the internal structure of the roller is fully stabilized and the heat is evenly and stably transferred to the roller core part.

6. The method for controlling the production process of steel coil acid transfer and continuous rolling according to claim 1, characterized in that: The specific parameters of the rolling parameter setting are: as shown in Figure 4, the present invention sets the outlet thickness and reduction rate of frames 1 to 5 to 1.55mm, 0.976mm, 0.621mm, 0.442mm and 0.35mm, respectively, and the corresponding reduction rates are 32.6%, 37.1%, 36.3%, 28.9% and 20.8% respectively; the tension of frames 1 to 4 is set to 110KN, 120KN, 130KN and 140KN, respectively.

7. The method for controlling the production process of steel coil acid transfer and continuous rolling according to claim 1, characterized in that: The specific process of pre-producing the steel coils and stabilizing the thermal crown is: first produce 2 rolls of W600 or W470 steel coils; by pre-producing these 2 rolls of steel coils, the rolls can gradually adapt to the rolling conditions and stabilize the thermal crown of the rolls.

8. The method for controlling the production process of steel coil acid transfer and continuous rolling according to claim 1, characterized in that: The specific parameters for adjusting the tension and starting to produce the XS02 steel coil tension are as follows: as shown in FIG4 , the tensions of racks 1 to 4 are set to 135KN, 140KN, 150KN and 170KN respectively.

9. The method for controlling the production process of steel coil acid transfer and continuous rolling according to claim 5, characterized in that: The specific process of timely adjusting the tension according to the production situation is as follows: when it is detected that the edge warping exceeds 0.5mm, the tension of frames 1 to 4 is fine-tuned according to the set tension adjustment strategy; the tension is gradually increased by 5KN each time the fine-tuning is performed.

10. A steel coil acid transfer and continuous rolling production process control system, characterized in that: include: Real-time monitoring equipment installation module: install the real-time monitoring equipment required for production at the appropriate location of the steel coil production line; Emulsion parameter precise control module: precise control of emulsion parameters. When the liquid saponification value reaches 165, it can effectively reduce the friction between the roller and the steel coil and reduce the rolling force. The liquid saponification value is monitored in real time using an online refractometer to ensure that the liquid saponification value is stable at 165, thereby extending the service life of the roller. Ensure that the emulsion concentration is stable at more than 3% to provide sufficient effective ingredients for lubrication and cooling; at the same time, strictly control the emulsion temperature between 50-55℃; use infrared temperature sensors for real-time monitoring to ensure that the emulsion temperature is ≥40℃ during refueling to prevent emulsion demulsification due to low oil temperature; Sleeve equipment module: prepare sleeves of corresponding specifications according to the different thicknesses of steel coils; for steel coils with a thickness of less than 0.35mm, since the inner ring is prone to instability and collapse during the coiling process, a special sleeve needs to be added to the inner ring; Roller preheating treatment module: Set the heating rate of the preheating equipment to 5°C / minute and start heating the roll; when the roll temperature rises to 100°C, maintain this temperature for 30 minutes to ensure that all parts of the roll are heated evenly; after 30 minutes, adjust the heating rate to 10°C / minute and continue heating the roll; when the roll temperature reaches the target operating temperature between 200-250°C, stop heating and keep the roll at this temperature for 15 minutes to fully stabilize the internal structure of the roll and transfer the heat evenly and stably to the roll core to avoid thermal stress concentration; Rolling parameter optimization setting module: For the production of steel coils with a raw material thickness of 5-2.3mm and a width of 1185-1245mm, as shown in FIG4 , the present invention scientifically sets the outlet thickness and reduction rate of frames 1 to 5 based on a large amount of production experience; the outlet thickness of frames 1 and 5 are set to 1.55mm, 0.976mm, 0.621mm, 0.442mm and 0.35mm, respectively, and the corresponding reduction rates are 32.6%, 37.1%, 36.3%, 28.9% and 20.8% respectively; at the same time, the tension of frames 1 to 4 is set to 110KN, 120KN, 130KN and 140KN, respectively. Through precise tension control, the steel coils can maintain a stable operating state during the rolling process to prevent defects such as deviation and cracking; Pre-production module: First produce 2 rolls of W600 or W470 steel coils; by pre-producing these 2 rolls of steel coils, the rolls can gradually adapt to the rolling conditions and stabilize the thermal crown of the rolls; at the same time, during the production process, the thermal crown of the rolls is measured once every 1 minute using the thermal crown monitoring system; when the results of three consecutive measurements show that the fluctuation range of the thermal crown of the rolls is within ±0.02mm, it is determined that the thermal crown of the rolls has reached a stable state; when the thermal crown reaches a stable state, switch to the production of XS02 steel coils, thereby ensuring the dimensional accuracy and surface quality of the XS02 steel coils during the rolling process, and avoiding product defects caused by unstable thermal crown of the rolls; Tension fine-tuning module: In the production of XS02 steel coils, edge warping is prone to occur due to the complex force on the edge. Based on a large amount of production data and experimental research in the early stage, the tension dynamics needs to be readjusted; The present invention resets the tension of the No. 1 to No. 4 stands; as shown in FIG4 , the tension of the No. 1 to No. 4 stands is set to 135KN, 140KN, 150KN and 170KN respectively; by increasing the tension, the stress distribution of the edge of the steel coil is changed, and the edge warping trend is effectively suppressed; at the same time, during the rolling process, the thickness gauge is used to monitor the edge state of the steel coil in real time. Once the sign of warping is found, the tension is immediately fine-tuned to ensure that the quality of the edge of the steel coil meets the requirements; The edge quality detection equipment installed at the exit of the rolling mill is used to monitor the edge status of the steel coil in real time. The edge quality detection equipment measures the edge warping of the steel coil every 5 seconds. When the edge warping is detected to be more than 0.5mm, the tension of the No. 1 to No. 4 frames is fine-tuned according to the set tension adjustment strategy. The tension is gradually increased by 5KN each time the fine-tuning is performed. For example, the tension of the No. 1 frame is increased from the current value to 140KN, the tension of the No. 2 frame is increased to 145KN, the tension of the No. 3 frame is increased to 155KN, and the tension of the No. 4 frame is increased to 175KN. After adjusting the tension, produce a 5-meter steel coil first, and then use the edge quality inspection equipment to check the edge warping of the steel coil again; if the edge warping still exceeds 0.2mm, continue to make fine adjustments according to the above adjustment strategy until the edge warping is controlled within 0.2mm; Real-time monitoring system module: During the entire production process, a complete real-time monitoring system is established to collect various process parameters in real time through online refractometers, infrared temperature monitoring instruments, roll preheating devices, and thickness gauges; And compare and analyze with the preset process parameters to ensure that the production process strictly meets the process requirements.

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