Automatic rolling method of titanium plate for hot rolling mill

Abstract

This invention provides an automatic rolling method for titanium plates suitable for hot rolling mills, comprising: S1, starting the system; S2, zeroing the mill; S3, setting rolling parameters according to the incoming plate material; S4, performing reversible rolling; S5, automatically detecting the thickness of the rolled plate to obtain the actual plate thickness A; S6, rolling the plate with a small reduction amount according to the actual plate thickness A and the target plate thickness B until the rolling target requirement is met; S7, slitting and blanking. This invention, on the one hand, enables more precise correction and adjustment of plate thickness, improving the accuracy of titanium plate thickness control, and also helps to improve the plate thickness correction efficiency and plate production efficiency. On the other hand, it enables automatic and accurate adjustment of the reduction amount according to the actual plate thickness, which helps to improve the automation level of the hot rolling mill, making the quality of the finished plate more stable and helping to maintain the consistency and continuity of good product quality.

Description

TECHNICAL FIELD

[0001] The present application relates to a titanium plate rolling method, in particular to a titanium plate automatic rolling method suitable for a hot rolling mill. BACKGROUND

[0002] Titanium and titanium alloy have excellent characteristics such as high strength, high hardness and low elastic modulus. At high temperature, titanium and titanium alloy can still maintain good mechanical properties, and its heat resistance is much higher than that of aluminum alloy, and its working temperature range is wider; at low temperature, titanium and titanium alloy still has excellent characteristics. Titanium has strong corrosion resistance, and its corrosion resistance is better than that of most stainless steel, aluminum alloy and other materials. With the further development of science and technology, titanium and titanium alloy are more and more widely used, which requires the processing technology of titanium and titanium alloy to be more and more advanced to meet the diversified needs of the industry. With the rapid development of China's equipment manufacturing industry and national defense and marine industry, it is particularly important to continuously improve the forming and rolling technology of titanium and titanium alloy plate.

[0003] All work in the rolling process of the existing hot rolling mill is completed by the main operator manually, the process is very tedious, and it relies too much on manual operation, which has certain misjudgment and misoperation risks, greatly reduces the accuracy of the hot rolling mill control, and cannot maintain the consistency and continuity of the product for a long time, and the production efficiency is low. And the current hot rolling cannot detect, feedback and adjust the plate, cannot collect relevant information for automatic adjustment, needs the main operator and the calender operator to detect the thickness and plate shape at any time, and then manually adjusts, prolongs the rolling time of a single plate. After rolling, the titanium plate generally has a thick size in the range of about 200-400mm in length at the head and tail, and the same plate difference can be more than 0.35-0.5mm, which leads to poor thickness control accuracy of the product. For some materials that are sensitive to temperature, the best rolling time is delayed due to the inability to adjust the plate in time, and the influence is more obvious. SUMMARY

[0004] Therefore, the present application aims to provide a titanium plate automatic rolling method suitable for a hot rolling mill to solve the problems of excessive reliance on manual operation, low automation degree and poor thickness control accuracy of titanium plate in the prior art.

[0005] To achieve the above-mentioned purpose, the technical scheme of the present application is as follows:

[0006] A titanium plate automatic rolling method suitable for a hot rolling mill, comprising: S1, starting the system; S2, rolling mill zero; S3, setting the rolling parameters according to the plate incoming material conditions; S4, performing reversible rolling; S5, automatically detecting the thickness of the rolled plate to obtain the actual thickness A of the plate; S6, according to the actual thickness A of the plate and the target thickness B of the plate, rolling the plate with a small reduction until the rolling target requirement is reached; and S7, cutting and discharging.

[0007] Further, in step S2, after confirming that all single hosts are ready, the rolls are contacted, and the rolling force at the instant of roll contact is ≥70T, the zeroing is started, and the rolling force is gradually increased until the zeroing is completed, and the system roll gap is automatically raised to the safe range of 15-25mm.

[0008] Further, in step S4, the head sinking compensation coefficient K C_im is used to adjust the reduction compensation for the thickness of the head of the plate, K C_im is calculated from the head sinking compensation formula, the head sinking compensation formula being

[0009]

[0010] wherein K C_im is the head sinking compensation; K IGC is the roll gap impact compensation; K GAP is the roll gap parameter; S OS1 is the absolute position of the operating side; S OS2 is the calibrated position of the operating side; S DS1 is the absolute position of the driving side; and S DS2 is the calibrated position of the driving side.

[0011] Further, step S6 includes: S61, calculating the thickness difference K=A-B according to A and B; S62, judging whether K>1mm; if not, then step S63 is performed; S63, judging whether K>0.5mm; if yes, then the first small reduction adjustment process is executed; if not, then step S64 is performed; S64, judging whether K>0.2mm; if yes, then the second small reduction adjustment process is executed; if not, then the third small reduction adjustment process is executed.

[0012] Further, the first small reduction amount adjustment process is: when the rolling force of the roll is 800T≤ rolling force of the roll <1000T, the reduction amount is +0.2mm~+1mm; when the rolling force of the roll is 1000T≤ rolling force of the roll <1200T, the reduction amount is -0.3mm~+0.2mm; when the rolling force of the roll is 1200T≤ rolling force of the roll <1500T, the reduction amount is -0.8mm~-0.3mm; when the rolling force of the roll is 1500T≤ rolling force of the roll <1800T, the reduction amount is -1.2mm~-0.8mm; when the rolling force of the roll is ≥1800T, the reduction amount is -2mm~-1.2mm. The second small reduction amount adjustment process is: when the rolling force of the roll is 800T≤ rolling force of the roll <1000T, the reduction amount is +0.8mm~+1.5mm; when the rolling force of the roll is 1000T≤ rolling force of the roll <1200T, the reduction amount is +0.2mm~+0.8mm; when the rolling force of the roll is 1200T≤ rolling force of the roll <1500T, the reduction amount is -0.3mm~+0.2mm; when the rolling force of the roll is 1500T≤ rolling force of the roll <1800T, the reduction amount is -0.8mm~-0.3mm; when the rolling force of the roll is ≥1800T, the reduction amount is -1.5mm~-0.8mm. The third small reduction amount adjustment process is: when the rolling force of the roll is 800T≤ rolling force of the roll <1000T, the reduction amount is +1.2mm~+2mm; when the rolling force of the roll is 1000T≤ rolling force of the roll <1200T, the reduction amount is +0.6mm~+1.2mm; when the rolling force of the roll is 1200T≤ rolling force of the roll <1500T, the reduction amount is +0.1mm~+0.6mm; when the rolling force of the roll is 1500T≤ rolling force of the roll <1800T, the reduction amount is -0.5mm~+0.1mm; when the rolling force of the roll is ≥1800T, the reduction amount is -1mm~-0.5mm.

[0013] Compared with the prior art, the automatic titanium plate rolling method suitable for a hot rolling mill has the following advantages:

[0014] The automatic titanium plate rolling method suitable for a hot rolling mill can automatically detect the thickness of the rolled plate, divide the plate into different correction and adjustment intervals according to the difference K between the actual thickness A of the plate and the target thickness B of the plate, and automatically execute the corresponding reduction amount adjustment process. On the one hand, the reduction amount can be adjusted in combination with the current rolling force of the roll under different K values, so that the plate thickness can be more accurately corrected and adjusted, the titanium plate thickness control precision is improved, the plate thickness correction efficiency and the plate production efficiency are also improved. On the other hand, the reduction amount can be automatically and accurately adjusted according to the actual thickness of the plate during the process of the plate passing through a certain roll, which is beneficial to improving the automation degree of the hot rolling mill, making the quality of the plate finished product more stable, and being beneficial to maintaining the consistency and continuity of the good quality of the product.

[0015] In addition, in the reversible rolling process, the length of the head thickness overproof part is shortened as much as possible by reducing the rolling speed at the time of mill bite, a dynamic roll gap compensation method is adopted, on the basis of eliminating the impact of bite on the roll gap, according to the head thickness overproof rule of the plate, the reduction is increased, the head thickness of the plate is consistent with the middle thickness, and the head and tail thickness of the plate is reduced to 0.1-0.2mm. The application also realizes the automatic completion of the mill group relying on zero operation, reduces the number of human intervention, and has more unity and executability. The automatic linkage operation of the rolling mill and the roller is automatically started, stopped, centered and a series of operations, and the rolling risk is greatly reduced. In the process of plate bite-reversible rolling-throwing, the rolling speed is more stable, especially in the reversible rolling process, the system rolls at a constant speed, which overcomes the problem of poor plate shape caused by unstable rolling speed of the original equipment. DETAILED DESCRIPTION

[0016] The inventive concepts of the present disclosure will be described below using terms that are commonly used by those skilled in the art to convey the substance of their work to others skilled in the art. However, these inventive concepts can be embodied in many different forms, and therefore should not be considered limited to the embodiments described herein.

[0017] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0018] The present application will be described in detail below with reference to the embodiments.

[0019] In order to solve the problems of excessive dependence on manual operation, low automation degree and poor titanium plate thickness control precision in the prior art, the present embodiment proposes a titanium plate automatic rolling method suitable for a hot rolling mill, comprising:

[0020] S1, starting the system;

[0021] Among them, the hot rolling mill operation program is started, the electrical, hydraulic and transmission systems are confirmed to be in the open state, and the related preparation work before the equipment operation is done. For reference, the starting operation requirements of the conventional hot rolling mill are not described in detail.

[0022] S2, mill zero;

[0023] Among them, after confirming that all single main machines are ready, the rolls are in contact, and the rolling force is greater than or equal to 70T at the moment of roll contact, the zero is started, and the rolling force is gradually increased until the zero is completed, and the system roll gap is automatically raised to the safety range of 15-25mm, so as to ensure the accurate control of the subsequent rolling mill and the normal rolling of the plate. In the process of zero, the rolling force gradually increases from 70T to 800T, and the whole zero process lasts for 2-3min.

[0024] S3, set the rolling parameters according to the plate material;

[0025] The rolling parameters include the number of rolling passes of the plate material, the rolling roll gap value of each pass, the rolling target value, the bending roll force required for rolling, the rotating speed of the mill train, etc. Since they are all conventional rolling parameters of the conventional hot rolling mill, no further description is given. According to different specifications of the hot rolling mill, preferably, the bending roll force is selected in the range of 36-160T, and the rotating speed of the mill train is in the range of 0.5-2.5m / s.

[0026] In addition, due to the differences in the plate material, the different requirements of the rolling target, and the differences in other rolling conditions, the rolling parameters will be different in the actual implementation process. The present application is not necessarily limited to a certain group or a few groups of rolling parameters. Only a few specific rolling parameters are provided in embodiments 1-3 for implementation reference.

[0027] S4, reversible rolling is performed;

[0028] After the rolling parameters are set by step S3, the system automatically performs reversible rolling. In the reversible rolling process, the push arm is automatically opened and closed, and the roll gap can be automatically adjusted. The system adjusts the plate thickness by adjusting the rolling speed and the roll gap of the rolling mill. By reducing the rolling speed when the rolling mill is engaged, the length of the head thickness overage is shortened as much as possible. In the reversible rolling process, the system rolls at a constant speed, overcoming the problem of poor plate shape caused by unstable rolling speed of the original equipment.

[0029] For the problem of large head thickness overage often existing in reversible rolling, the present application adopts a dynamic roll gap compensation method in step S4. On the basis of eliminating the impact of engagement on the roll gap, according to the head thickness overage rule of the plate material, the reduction amount is increased to make the head thickness of the plate material consistent with the middle thickness. Specifically, the dynamic roll gap compensation method includes adjusting the reduction amount compensation for the head thickness of the plate material through a head sinking compensation coefficient K C_im K C_im which is calculated from the head sinking compensation formula, the head sinking compensation formula is

[0030]

[0031] K C_im is the head sinking compensation; K IGC is the roll gap impact compensation; K GAP is the roll gap parameter; S OS1 is the absolute position of the OS side (operation side); S OS2 is the calibrated position of the OS side (operation side); S DS1 is the absolute position of the DS side (driven side, driving side); S DS2 is the calibrated position of the DS side (driven side, driving side).IGC The value can be adjusted via HMI (Human-Machine Interface) as needed. Setting the compensation value too small won't solve the problem of excessive head thickness, while setting it too large will cause instability in thickness control. Based on extensive production practice and operational experience, setting the roll gap impact compensation K... IGC Setting the gap to 0.1mm, meaning the actual roll gap at the head of the sheet is 0.1mm thinner than the set gap, is a preferred value. Therefore, this application utilizes a dynamic roll gap compensation method during reversible rolling, particularly through a head sinking compensation coefficient K. C_im This adjustment compensates for the thickness reduction at the head of the board, effectively controlling the length of the portion exceeding the thickness tolerance at the head. It allows for appropriate increases in the reduction amount based on actual conditions, ensuring that the thickness at the head of the board is as consistent as possible with the thickness in the middle.

[0032] During the reversible rolling process in step S4, the rolling parameters in step S3 are automatically adjusted. After completing one rolling pass according to the relevant set parameters, step S5 is performed.

[0033] S5. Automatically detect the thickness of the rolled sheet to obtain the actual thickness A of the sheet;

[0034] After one rolling pass, the sheet metal is transported to a thickness gauge. Using three-point measurement technology, the thickness information from the drive side, center point, and operating side of the sheet metal is fed back to the HMI in real time, allowing for a direct view of the sheet metal's thickness after rolling. That is, the actual sheet metal thickness A includes at least the specific thickness values ​​from the drive side, center point, and operating side. The use of the thickness gauge and its automatic detection can directly utilize existing thickness detection equipment, and will not be elaborated further.

[0035] S6. Based on the actual thickness A and the target thickness B of the plate, roll the plate with a small reduction until the rolling target requirements are met.

[0036] In step S6, based on the target thickness B of the sheet metal and combined with the actual thickness A, the sheet metal is rolled and leveled with a small reduction, and the result is compared with the target thickness B. Multiple corrections are made until the rolling target requirement is met. For the rolling target requirement, depending on the precision required in actual production, a certain upper and lower limit deviation is often allowed between the actual rolling target requirement and the target thickness B. During the small reduction adjustment process, the minimum rolling force of the rolls is preferably 800T.

[0037] In view of the fact that the thickness of the plate at different positions often has certain differences, the actual thickness A of the plate should be the thickness of the plate at the rolling position corresponding to the current roll at the current time point when the roll is rolling. Therefore, the small reduction rolling in step S6 should be carried out at the rolling position corresponding to the roll at the rolling time point. At the same time, since the rolling process is accompanied by the movement of the plate, as the rolling time elapses, the position of the plate also changes, and the value of A also changes, so the small reduction rolling process of the roll also needs to be adjusted accordingly.

[0038] If a fixed reduction rolling operation is adopted, it often leads to poor plate thickness correction effect. Therefore, in order to improve the degree of automation and the degree of precision of control of small reduction rolling, step S6 includes:

[0039] S61, calculating the thickness difference K = A-B according to A and B;

[0040] S62, judging whether K>1mm; if yes, carrying out normal reduction rolling and returning to step S5; if no, carrying out step S63;

[0041] If K≤1mm, it means that the thickness of the plate is relatively small compared with the target thickness, and the plate thickness can be accurately corrected and adjusted by fine small reduction rolling. If K>1mm, it means that the thickness of the plate is relatively large compared with the target thickness, in order to improve the correction efficiency, the normal reduction rolling operation can be directly executed, and then returned to step S5. For the normal reduction rolling technology, the existing technology can be directly referred to, and no further description is made.

[0042] S63, judging whether K>0.5mm; if yes, executing the first small reduction adjustment process; if no, carrying out step S64;

[0043] When 0.5mm

[0044] Table 1 Adjustment of rolling force and reduction of roll in the first small reduction adjustment process

[0045] Rolling force / T Reduction / mm 800-1000 +0.2～+1 1000-1200 -0.3～+0.2 1200-1500 -0.8～-0.3 1500-1800 -1.2～-0.8 ≥1800 -2～-1.2

[0046] The positive and negative signs in the reduction value correspond to the adjustment of the roll gap. That is, the positive reduction value corresponds to the adjustment of the roll gap, and the negative reduction value corresponds to the adjustment of the roll gap. The same applies in this application, and no further description is made below.

[0047] S64, judging whether K>0.2mm; if yes, executing the second small reduction adjustment process; if no, executing the third small reduction adjustment process.

[0048] wherein, when 0.2mm

[0049] Table 2: Adjustment of rolling force and reduction of the roll in the second small reduction adjustment process

[0050] Rolling force / T Reduction / mm 800-1000 +0.8～+1.5 1000-1200 +0.2～+0.8 1200-1500 -0.3～+0.2 1500-1800 -0.8～-0.3 ≥1800 -1.5～-0.8

[0051] When K≤0.2mm, the third small reduction adjustment process is executed. For a certain roll, the reduction is automatically adjusted according to the rolling force of the roll at the current time point, as shown in Table 3. Since in the actual rolling process, if A is very close to B, thickness correction is not necessary, and A

[0052] Table 3: Adjustment of rolling force and reduction of the roll in the third small reduction adjustment process

[0053] Rolling force / T Reduction / mm 800-1000 +1.2～+2 1000-1200 +0.6～+1.2 1200-1500 +0.1～+0.6 1500-1800 -0.5～+0.1 ≥1800 -1～-0.5

[0054] Thus, in step S6, according to the difference K between the actual thickness A of the plate and the target thickness B of the plate, different correction and adjustment intervals are divided, and corresponding reduction adjustment processes are executed; especially, when K≤1mm, corresponding small reduction adjustment processes are executed, so that the reduction can be automatically adjusted according to the rolling force of the roll at the current time point. With the continuous rolling process of the plate, on the one hand, the reduction can be adjusted in combination with the rolling force of the current roll under different K values, so that the plate thickness can be more accurately corrected and adjusted, the thickness control precision of the titanium plate is improved, the correction efficiency of the plate thickness and the production efficiency of the plate are also improved, on the other hand, the reduction can be automatically and accurately adjusted according to the actual thickness of the plate during the process of the plate passing through a certain roll, which is beneficial to improve the automation degree of the hot rolling mill, so that the quality of the finished plate is more stable, which is beneficial to maintain the consistency and continuity of the good quality of the product.

[0055] S7, slitting and cutting.

[0056] After the plate meets the rolling target requirements, it is conveyed to the slitting and cutting area by the conveying roller, and it is determined whether it needs to be cut to size according to the requirements. If it needs to be cut to size, the size length is selected according to the process requirements, which is often between 800-3000mm.

[0057] Therefore, by steps S1-S7, especially steps S5 and S6, the thickness of the rolled plate is automatically detected, and according to the difference K between the actual thickness A of the plate and the target thickness B of the plate, the plate is divided into different correction and adjustment intervals, and the corresponding reduction amount adjustment process is automatically performed. On the one hand, under different K values, the reduction amount can be adjusted in combination with the current rolling force of the roll, so that the plate thickness can be more accurately corrected and adjusted, the titanium plate thickness control precision is improved, and the plate thickness correction efficiency and plate production efficiency are also improved. On the other hand, during the process of the plate passing through a certain roll, the reduction amount can be automatically and accurately adjusted according to the actual thickness of the plate, which is beneficial to improve the automation degree of the hot rolling mill, so that the quality of the plate product is more stable, and it is beneficial to maintain the consistency and continuity of the good quality of the product.

[0058] In addition, in the reversible rolling process, the length of the head thickness overproof part is shortened as much as possible by reducing the rolling speed when the rolling mill bites, and a dynamic roll gap compensation method is adopted. On the basis of eliminating the impact of biting on the roll gap, the reduction amount is increased according to the head thickness overproof rule of the plate, so that the head thickness of the plate is consistent with the middle thickness, and the head-to-tail thickness difference of the plate is reduced to 0.1-0.2mm. The application also realizes automatic completion of the zero operation of the unit, reduces the number of human intervention, and has more uniformity and executability. The automatic linkage operation of the rolling mill and the roller is automatically started, stopped, centered and a series of operations. The rolling risk is greatly reduced. The rolling speed is more stable during the plate biting→reversible rolling→throwing process. Especially in the reversible rolling process, the system rolls at a constant speed, which overcomes the problem of poor plate shape caused by unstable rolling speed of the original equipment.

[0059] Example 1

[0060] Pure titanium plate 24mm rolling

[0061] First, start the system:

[0062] Start the hot rolling mill operation program, confirm that the electrical, hydraulic and transmission systems are in the open state, and complete the related preparation work before the equipment works.

[0063] Second, the rolling mill is zeroed:

[0064] Confirm that all single main machines are ready, and the system automatically performs electric reduction, roll contact, main machine zeroing and other operations through pre-set parameters, so that the rolling force is 72T at the moment of roll contact, and the zeroing starts. After the roll is fully contacted, gradually increase the rolling force to 804T, and continue for 1min to end the zeroing. After the zeroing is completed, the system roll gap is automatically raised to a safety point of 20mm.

[0065] Third step, set the process parameters:

[0066] According to the plate material, according to the input thickness, the output thickness, the input each pass (a total of 10 passes) needs to distribute the rolling gap data 170-178mm, 155-165mm, 135-145mm, 115-125mm, 95-105mm, 75-85mm, 55-65mm, 40-45mm, 30-33mm, 24.5-26mm; According to 120-160T, 120-160T, 120-160T, 100-120T, 100-120T, 100-120T, 80-100T, 80-100T, 60-80T, 36-60T, the bending roll force data selection of each pass; According to the input corresponding to the unit rotation speed, select the speed parameter 1.5-1.8m / s, 1.5-1.8m / s, 1.5-1.8m / s, 1.4-1.6m / s, 1.4-1.6m / s, 1.2-1.5m / s, 1.2-1.5m / s, 1.0-1.2m / s, 0.6-1.0m / s, 0.4-0.8m / s; Calculate the front slip and the back slip, and match the parameters of each pass as a whole.

[0067] Fourth step, reversible rolling:

[0068] According to the preset parameters, the system automatically performs reversible rolling, the push arm automatically opens and closes during the process, the opening degree is between 1000-1150mm+10-20mm, and the roll gap is automatically adjusted. The system automatically adjusts according to the parameters distributed in each pass during rolling, and the rolling force of the plate is between 800-1000T. When the plate is bitten and thrown out, the overall depression is automatically performed according to the actual feedback rolling force, the range is between 0.2-0.8mm, the plate head and tail difference is reduced, and the set parameters are executed to end one rolling.

[0069] Fifth step, data feedback and analysis:

[0070] After one rolling is completed, the plate is transported to the thickness gauge, and the thickness information of the plate transmission side, center point and operation side is fed back to the HMI interface in time through three-point measurement technology. The thickness of the plate after rolling can be directly observed, as shown in Table 4.

[0071] Table 4 Pure titanium plate 24mm rolling thickness information statistics (unit: mm)

[0072]

[0073] It should be noted that, due to the large size of the plate and the continuous change of the thickness data, the present application cannot enumerate a large number of thickness data one by one, and only the maximum value, the minimum value and the average value of the actual thickness A of the plate are taken as examples. At the same time, the "average value" is not the average between the maximum value and the minimum value, but the average calculation of all the detected thicknesses of the transmission side, the center point and the operation side respectively. The same is true for other embodiments in the present application, which will not be described hereinafter.

[0074] Sixth step, small reduction rolling:

[0075] According to the target thickness B (24mm) of the plate, according to the actual thickness A of the plate at the corresponding position of the plate, the automatic small reduction adjustment process of steps S61-S4 is adopted to carry out small reduction rolling and flattening, and multiple passes are corrected until the target requirement is reached.

[0076] Seventh step, slitting and cutting:

[0077] After the plate reaches the target requirement, it is transported to the slitting and cutting area by the conveying roller way for slitting and cutting operation. The plate is automatically transported to the slitting and cutting area by the conveying roller way, and is slitted and cut according to the actual length 8850-9500mm of the plate. The setting parameter of the slitting mechanism setting machine is set for sizing and cutting, and the range is between 800-3000mm, completing the rolling process.

[0078] Example 2

[0079] TC4 plate 16mm rolling

[0080] First step, start the system:

[0081] Start the hot rolling operation program, confirm that the electrical, hydraulic and transmission systems are in the open state, and make relevant preparations before the equipment works.

[0082] Second step, mill zero:

[0083] Confirm that all single main machines are ready, and the system automatically performs the operations of motorized reduction, roll contact, mill zero and the like through the pre-set parameters, so that the rolling force is 75T at the moment of roll contact, and the zeroing starts. After the roll is fully contacted, the rolling force is gradually increased to 801T, and the zeroing is ended after 2min, and the roll gap of the system is automatically raised to a safety point of 22mm after the zeroing is ended.

[0084] Third step, set the process parameters:

[0085] According to the plate material, according to the input thickness, the output thickness, the rolling gap data required to be distributed in each pass is 115-125mm, 100-110mm, 80-85mm, 55-65mm, 40-45mm, 30-35mm, 25-30mm, 20-25mm, 18-22mm, 16.5-18mm; According to 120-160T, 120-160T, 120-160T, 100-120T, 100-120T, 100-120T, 80-100T, 80-100T, 60-80T, 36-60T, the bending roller force data selection is carried out; According to the input information of the incoming material, the corresponding rotating speed of the unit is selected, the speed parameter is 1.5-1.8m / s, 1.5-1.8m / s, 1.6-2.0m / s, 1.6-2.0m / s, 1.5-1.8m / s, 1.5-1.8m / s, 1.2-1.5m / s, 1.0-1.2m / s, 0.6-1.0m / s, 0.4-0.6m / s; The front slip and the rear slip are calculated, and the overall matching of the parameters of each pass is carried out.

[0086] Fourth step, reversible rolling:

[0087] According to the preset parameters, the system automatically carries out reversible rolling, and the opening degree is between 1050-1100mm+10-20mm during the automatic opening and closing of the push arm, and the roll gap is automatically adjusted. The system automatically adjusts according to the parameters distributed in each pass during rolling, and the rolling force of the plate is between 1000-1200T. When the plate is bitten and thrown out, the overall depression is automatically carried out according to the actual feedback rolling force, the range is between-0.3+0.2mm, the plate head and tail difference is reduced, and the set parameters are executed to end one rolling.

[0088] Fifth step, data feedback and analysis:

[0089] After one rolling is completed, the plate is transported to the thickness gauge, the thickness information of the plate transmission side, the center point and the operation side is fed back to the HMI interface in time through three-point measurement technology, the thickness of the plate after rolling can be directly observed, and the specific information is shown in Table 5.

[0090] Table 5 TC4 plate 16mm rolling thickness information statistics (unit: mm)

[0091]

[0092] Sixth step, small reduction rolling:

[0093] According to the target thickness B (16mm) of the plate, according to the actual thickness A of the plate at the corresponding position of the plate, the automatic small reduction adjustment process of steps S61-S4 is adopted, the small reduction rolling and the flattening are carried out, the multi-pass correction is carried out, and the target requirement is reached.

[0094] Seventh step, slitting and cutting:

[0095] The plate is automatically transported to the slitting and cutting area by the conveying roller, and is cut according to the actual length of the plate, 6800-7700 mm. The cutting mechanism sets the parameters for sizing and cutting, with a range of 800-1100 mm. The rolling process is completed.

[0096] Example 3

[0097] Titanium alloy plate 4.0 mm rolling

[0098] First step, start the system:

[0099] Start the hot rolling mill operation program, confirm that the electrical, hydraulic and transmission systems are in the open state, and complete the related preparation work before the equipment works.

[0100] Second step, mill approach zero:

[0101] Confirm that all single main machines are ready, and the system automatically performs the operations of motorized reduction, roller contact, main machine approach zero, etc. through the pre-set parameters, so that the rolling force is 73T at the moment of roller contact, and the approach zero begins. After the rollers are fully contacted, gradually increase the rolling force to 806T, and continue for 2 min to end the approach zero. After the approach zero is completed, the system gap is automatically raised to a safety point of 23 mm.

[0102] Third step, set the process parameters:

[0103] According to the plate incoming conditions, input the rolling gap data required for each pass according to the incoming and outgoing thickness, 5.6-6.2 mm, 4.5-5.2 mm, 3.8-4.5 mm, 3.2-3.8 mm, 2.7-3.4 mm; select the bending roller force data according to 130-150T, 120-140T, 100-120T, 60-100T, 40-60T; input the corresponding unit rotation speed according to the incoming information, select the speed parameters 1.5-1.8 m / s, 1.5-1.8 m / s, 1.6-2.0 m / s, 1.6-2.0 m / s, 1.5-1.8 m / s, 1.5-1.8 m / s, 1.2-1.5 m / s, 1.0-1.2 m / s, 0.6-1.0 m / s, 0.4-0.6 m / s; calculate the front and rear slides to match the parameters of each pass.

[0104] Fourth step, reversible rolling:

[0105] According to preset parameters, the system automatically carries out reversible rolling, the push arm is automatically opened and closed during the process, the opening degree is between 1050-1100mm+10-20mm, and the roll gap is automatically adjusted. The system automatically adjusts according to the parameters allocated in each pass during the rolling process, and the plate rolling force is between 1500-1800T. When the plate is bitten and thrown out, the overall depression is automatically carried out according to the actual feedback rolling force, the range is between-0.8--0.3mm, the same plate difference of the plate head and tail is reduced, and the setting parameter is executed to end one rolling range.

[0106] Step 5, data feedback and analysis:

[0107] After one rolling range is finished, the plate is transported to the thickness gauge, the thickness information of the plate transmission side, center point and operation side is fed back to the HMI interface in time through three-point measurement technology, the thickness of the plate after rolling can be directly observed, and the specific information is shown in Table 6.

[0108] Table 6: Titanium alloy plate 4.0mm rolling thickness information statistics (unit: mm)

[0109]

[0110] Step 6, small reduction rolling:

[0111] According to the target thickness B (4mm) of the plate, according to the actual thickness A of the plate at the corresponding position of the plate, the automatic small reduction adjustment process of steps S61-S4 is adopted to carry out small reduction rolling and flattening, and multiple passes are corrected until the target requirement is reached.

[0112] Step 7, slitting and cutting:

[0113] The plate is automatically transported to the slitting and cutting area by the conveying roller, and is slitting and cutting according to the actual length 2700-3900mm of the plate, and the rolling process is completed.

[0114] The above only describes the preferred embodiments of the present application, and does not limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for automatically rolling a titanium plate for a hot rolling mill, characterized by, The method comprises: S1, starting the system; S2, the rolling mill is zero; S3, according to the plate material, set the rolling parameters; S4, reversible rolling is carried out; S5, the thickness of the rolled plate is automatically detected to obtain the actual thickness A of the plate; S6, according to the actual thickness A of the plate and the target thickness B of the plate, the plate is rolled with a small reduction, until the target requirement of rolling is reached; S7, cutting and discharging; In step S4, a dynamic roll gap compensation method is adopted to eliminate the impact of bite-in on the roll gap, and according to the thickness deviation law of the head of the plate, the reduction is increased to make the thickness of the head of the plate consistent with the thickness of the middle, the dynamic roll gap compensation method comprises adjusting the reduction compensation for the thickness of the head of the plate through a head sinking compensation coefficient K C_im K C_im is calculated by a head sinking compensation formula, and the head sinking compensation formula is ; wherein K C_im is a head sink compensation factor; K IGC is a roll gap impact compensation; K GAP is a roll gap parameter; S OS1 is an absolute position of the operating side; S OS2 is a calibrated position of the operating side; S DS1 is an absolute position of the drive side; S DS2 is a calibrated position of the drive side.

2. The automatic rolling method of titanium plate for a hot rolling mill according to claim 1, wherein In step S2, after confirming that all single host computers are ready, the rolls are contacted, and the rolling force is greater than or equal to 70T at the moment of roll contact, the zeroing is started, and the rolling force is gradually increased until the zeroing is completed, and the system roll gap is automatically raised to a safety range of 15-25mm.

3. The method according to claim 1, wherein the method is characterized by, Step S6 comprises: S61, calculating the thickness difference K=A-B according to A and B; S62, judging whether K>1mm; if not, step S63 is performed; S63, judging whether K>0.5mm; if yes, the first small reduction adjustment process is executed; if not, step S64 is performed; S64, judging whether K>0.2mm; if yes, the second small reduction adjustment process is executed; if not, the third small reduction adjustment process is executed.

4. A method for automatically rolling titanium plates for a hot rolling mill according to claim 3, wherein The first small reduction adjustment process is: when the rolling force of the rolls is 800T≤rolling force of the rolls<1000T, the reduction is +0.2mm~+1mm; when the rolling force of the rolls is 1000T≤rolling force of the rolls<1200T, the reduction is -0.3mm~+0.2mm; when the rolling force of the rolls is 1200T≤rolling force of the rolls<1500T, the reduction is -0.8mm~-0.3mm; when the rolling force of the rolls is 1500T≤rolling force of the rolls<1800T, the reduction is -1.2mm~-0.8mm; and when the rolling force of the rolls is ≥1800T, the reduction is -2mm~-1.2mm.

5. The method according to claim 3, wherein the titanium plate is automatically rolled by the method. The second small reduction adjustment process is: when the rolling force of the rolls is 800T≤rolling force of the rolls<1000T, the reduction is +0.8mm~+1.5mm; when the rolling force of the rolls is 1000T≤rolling force of the rolls<1200T, the reduction is +0.2mm~+0.8mm; when the rolling force of the rolls is 1200T≤rolling force of the rolls<1500T, the reduction is -0.3mm~+0.2mm; when the rolling force of the rolls is 1500T≤rolling force of the rolls<1800T, the reduction is -0.8mm~-0.3mm; and when the rolling force of the rolls is ≥1800T, the reduction is -1.5mm~-0.8mm.

6. The automatic titanium sheet rolling method for a hot rolling mill according to claim 3, wherein The third small reduction adjustment process is: when the rolling force of the rolls is 800T≤rolling force of the rolls<1000T, the reduction is +1.2mm~+2mm; when the rolling force of the rolls is 1000T≤rolling force of the rolls<1200T, the reduction is +0.6mm~+1.2mm; when the rolling force of the rolls is 1200T≤rolling force of the rolls<1500T, the reduction is +0.1mm~+0.6mm; when the rolling force of the rolls is 1500T≤rolling force of the rolls<1800T, the reduction is -0.5mm~+0.1mm; and when the rolling force of the rolls is ≥1800T, the reduction is -1mm~-0.5mm.

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