Device and method for relieving metal ultra-thin strip surface scratches caused by turning rollers

Abstract

The invention discloses a device and method for relieving metal ultra-thin strip surface scratches caused by turning rollers, the device comprises a mechanical part and a control system, and the mechanical part comprises a first turning motor, a second turning motor, a first turning speed reducer, a second turning speed reducer, a first turning roller and a second turning roller; the control system comprises a measurement sensor, an operation table, an industrial personal computer, a PLC and a control cabinet. Relative sliding between the turning roller and the metal ultra-thin strip during rolling can be effectively reduced or eliminated, so that surface scratches of the metal ultra-thin strip are reduced or eliminated, the surface quality of an ultra-thin strip product is improved, and the requirements of products such as fine metal masks and vapor chambers are met.

Description

Technical Field

[0001] This application relates to the processing of thin metal strips, and more particularly to an apparatus and method for reducing surface scratches on extremely thin metal strips caused by guide rollers. Background Technology

[0002] In recent years, with the development of industries such as low-altitude economy, intelligent robots, wearable devices, electric vehicles and consumer electronics, the market demand for high-quality, low-cost ultra-thin metal strips has risen sharply. Applications such as fine metal masks (FMMs) and steel plate printing foils urgently require high-precision ultra-thin metal strips with high surface quality. Defects such as pits and scratches seriously affect the yield of these products.

[0003] During the production of ultra-thin metal strips, relative sliding occurs between the ultra-thin metal strip and the guide roller, resulting in a "slippage" phenomenon, which is one of the main causes of surface scratches on ultra-thin metal strips.

[0004] Traditional guide rollers are typically inert rollers, rotating due to friction between the ultra-thin metal strip and the roller. When the frictional torque exerted by the ultra-thin metal strip on the guide roller is less than the roller's resistance torque, relative slippage occurs between the strip and the roller, resulting in "slippage" and scratches on the strip's surface. In the production of ultra-thin metal strips, slippage is particularly prone to occur due to the relatively low total tension; it is even more frequent during the acceleration and deceleration phases of the rolling process due to rapid changes in the workpiece speed. Therefore, to produce ultra-thin metal strips with high surface quality and eliminate surface scratches, it is essential to eliminate slippage between the strip and the guide roller. Summary of the Invention

[0005] The purpose of this invention is to provide a device and method for reducing surface scratches on ultra-thin metal strips caused by the guide roller. This device can effectively reduce or eliminate the relative sliding between the guide roller and the ultra-thin metal strip during rolling, thereby reducing or eliminating surface scratches on the ultra-thin metal strip, improving the surface quality of ultra-thin strip products, and meeting the needs of products such as fine metal photomasks and steel plate printing foils.

[0006] To achieve the above objectives, the present invention provides the following technical solution.

[0007] This application discloses a device for mitigating surface scratches on extremely thin metal strips caused by steering rollers. The device includes a mechanical component and a control system. The mechanical component includes a steering motor, a steering motor, a steering reducer, a steering reducer, a steering roller, and a steering roller. The control system includes measuring sensors, an operating console, an industrial computer, a PLC, and a control cabinet. The industrial computer is equipped with a WinCC-configured human-machine interface (HMI) for the control system. The HMI includes input fields for the speed ratio i, the target thickness h0, and a forward slip correction coefficient. Input domain, backslip correction coefficient Input domain, allowable value of belt speed change sensitivity coefficient Input domain, allowable value of sensitivity coefficient to changes in bandwidth Input field, allowable thickness control accuracy Input domain, belt speed change calculation cumulative time Accumulated time calculation based on input domain and band length variation The input field includes a two-way switch for adjusting the rolling direction on the operating table.

[0008] Preferably, in the above-mentioned device for reducing surface scratches on the extremely thin metal strip caused by the steering roller, both the first steering motor and the second steering motor are reversible motors, located on both sides of the archway respectively. The first steering motor drives the first steering roller through the first steering reducer, and the second steering motor drives the second steering roller through the second steering reducer.

[0009] Preferably, in the above-mentioned device for reducing surface scratches on the extremely thin metal strip caused by the steering roller, the first steering roller and the second steering roller are hollow rollers with chromium plating on their surfaces. The chromium plating layer is greater than 50 μm, the surface hardness is 800~1000 HV, and the surface is polished with a roughness Ra = 0.01~0.015 μm.

[0010] Accordingly, a method for reducing surface scratches on extremely thin metal strips caused by the guide rollers is also disclosed, comprising the following steps in sequence:

[0011] Step 1: Set basic rolling parameters, including the speed ratio. Target thickness h0, forward slip correction coefficient Backslip correction coefficient Allowable value of belt speed change sensitivity coefficient Allowable value of sensitivity coefficient for band length variation Allowable values ​​for thickness control accuracy Calculation of cumulative time for belt speed change Calculate the cumulative time based on the change in belt length ;

[0012] Step 2: Start the rolling mill, and the linear speeds of the upper and lower work rolls reach the set speed ratio. When the rolling mill enters the speed-up phase, during left-hand rolling, the upper work roll is the slow-speed roll and the lower work roll is the fast-speed roll; during right-hand rolling, the lower work roll is the slow-speed roll and the upper work roll is the fast-speed roll. The linear speed of the fast-speed roll is [a certain percentage] of that of the slow-speed roll. times;

[0013] Step 3: According to Incremental speed of inner high-speed roller Determine the control mode of the steering roller and the rapid roller linear speed increment. Through formula The calculation shows that, in the formula and They are respectively The speed of the rapid roller at the start and end of the timing is calculated from the measured speed of the main motor. During the acceleration / deceleration rolling stage, the steering rollers adopt speed control mode, and the steering step is step four; if Then it is in the uniform speed rolling stage, the steering roller adopts torque control mode, and the steering step is six;

[0014] Step 4: Steering roller speed control mode, set the reference value for the steering roller linear speed, and measure the actual linear speed of the high-speed roller. Slow roller linear speed The entry thickness H and exit thickness h of the rolled piece are set to a linear velocity of the front steering roller. The linear velocity of the rear steering roller is ;

[0015] Step 5: Steering roller speed control mode. Determine the steering roller linear speed adjustment amount, measure the front steering roller speed and winding speed, and calculate the cumulative time using PLC and industrial computer. The arc length of the inner front steering roller and winding length ,if and Increase the linear speed of the front steering roller; if and Reduce the linear speed of the front steering roller; if With the linear velocity of the front steering roller remaining constant, the actual rotational speed of the rear steering roller and the unwinding speed were measured, and the cumulative time was calculated using a PLC and an industrial control computer. The arc length of the inner rear steering roller and unwinding belt length ,if and Increase the linear speed of the rear steering roller; if and Reduce the linear speed of the rear steering roller; if The linear speed of the rear steering roller remains unchanged, and the steering step is step eight.

[0016] Step Six: Steering Roller Torque Control Mode. Set the steering motor output torque reference value and measure the linear velocity of the front steering roller. Rear steering roller linear speed Pretension and post-tension According to the linear speed of the front steering roller and pretension Determine the required output torque of the front steering motor to eliminate the resistance torque of the front steering rollers by referring to the table. According to the linear speed of the rear steering roller and post-tension Determine the required output torque of the rear steering motor to eliminate the resistance torque of the rear steering rollers by referring to the table. ;

[0017] Step 7: Steering roller torque control mode. Determine the output torque adjustment of the steering motor, measure the front steering roller speed and winding speed, and calculate the cumulative time using PLC and industrial computer. The arc length of the inner front steering roller and winding length ,if and Increase the output torque of the front steering motor; if and Reduce the output torque of the front steering motor; if With the output torque of the front steering motor remaining constant, the actual measured speeds of the rear steering roller and unwinding speed were used to calculate the cumulative time via PLC and industrial computer. The arc length of the inner rear steering roller and unwinding belt length ,if and Increase the output torque of the steering motor; if and This reduces the output torque of the rear steering motor; if The output torque of the rear steering motor remains unchanged;

[0018] Step 8: Determine if the pass has ended, and measure the actual speed of the high-speed roller. ,if If the round is not finished, return to step three; if The course is now complete. Proceed to step nine.

[0019] Step 9: Determine if rolling is complete by measuring the exit thickness h of the rolled piece. If... Change the rolling direction, interchange the winding and unwinding, interchange the front and rear steering rollers, and interchange the fast and slow rollers, then return to step three; if Rolling is complete.

[0020] Compared with existing technologies, the advantages of this invention are as follows: It employs surface-treated guide rollers with high hardness (800~1000 HRV) and low roughness (R_a=0.01~0.015μm), reducing the conditions for surface scratches on the strip. The bearings at both ends of the guide rollers are self-aligning bearings, appropriately increasing resistance and allowing the guide motor to operate within a more comfortable control range. A combination of speed control and torque control modes is used to eliminate the resistance torque of the guide rollers during asynchronous rolling of ultra-thin metal strips. Speed ​​control is used during the acceleration and deceleration rolling stages, while torque control is used during the uniform speed rolling stage. This invention can reduce or even eliminate the relative slippage between the metal strip and the guide roller that is easily caused by traditional guide rollers using non-driven inertial rollers, thereby reducing or even eliminating surface scratches and improving the surface quality of ultra-thin metal strips. This invention combines actively controlled driven guide rollers with surface-treated guide rollers to reduce or even eliminate surface scratches on ultra-thin metal strips, improving their surface quality and better leveraging the efficiency advantages of asynchronous rolling in the production of high-quality ultra-thin metal strips. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 The diagram shown is a schematic representation of the control system in a specific embodiment of the present invention;

[0023] Figure 2 The figure shown is a top view of the mechanical part in a specific embodiment of the present invention;

[0024] Figure 3 The figure shown is a top view of the mechanical part in a specific embodiment of the present invention;

[0025] Figure 4 The diagram shows a flowchart of a method for mitigating surface scratches on extremely thin metal strips caused by steering rollers in a specific embodiment of the present invention.

[0026] In the diagram: 1—Mechanical component, 2—Industrial control computer, 3—PLC, 4—Operating console, 5—Control cabinet, 6—Encoder 1 for measuring the speed of the steering roller, 7—Self-aligning bearing 1, 8—Steering roller 1, 9—Self-aligning bearing 2, 10—Steering reducer 1, 11—Steering motor 1, 12—Encoder 1 for measuring the speed of the steering motor, 13—Winding reducer 1, 14—Winding motor 1, 15—Encoder 1 for measuring the speed of the winding motor, 16—Main motor 1, 17—Encoder 1 for measuring the speed of the main motor, 18—Encoder 2 for measuring the speed of the main motor, 19—Main motor 2, 20—Main reducer 2, 21—Encoder 2 for measuring the speed of the steering motor, 22—Steering motor 2, 23—Encoder 2 for measuring the speed of the winding motor, 24—Winding motor 2 25—Drum 1, 26—Main reducer 1, 27—Thickness gauge 1, 28—Coupling 1, 29—Thickness gauge 2, 30—Steering reducer 2, 31—Encoder 2 for measuring steering roller speed, 32—Steering roller 2, 33—Strip, 34—Drum 2, 35—Winding reducer 2. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0030] Combination Figure 1-4As shown, the device for mitigating surface scratches on extremely thin metal strips caused by steering rollers includes a mechanical part 1 and a control system. The mechanical part includes a steering motor 11, a steering motor 22, a steering reducer 10, a steering reducer 20, a steering roller 8, a steering roller 2 32, and a strip 33. Steering motors 1 and 2 are both reversible motors, located on opposite sides of the frame. Steering motor 1 drives steering roller 1 via steering reducer 1, and steering motor 2 drives steering roller 2 via steering reducer 2. The steering rollers are hollow rollers with chrome plating (chrome plating layer greater than 50μm, surface hardness 800~1000HV) and polished surface treatment (roughness Ra = 0.01~0.015μm). Self-aligning bearings (such as...) are installed in the bearing seats at both ends of the steering rollers. Figure 2 The middle steering roll 8 is equipped with self-aligning bearings 7 and 9 at both ends. An encoder is installed on the operating side of the steering roll, and an encoder is installed at the tail of the steering motor. The steering roll mechanical part is a component of the rolling mill mechanical part. The rolling mill mechanical part includes the stand, pressing device, upper work roll, lower work roll, upper support roll, lower support roll, main motor 16, main motor 29, main reducer 16, main reducer 20, coupling 18, coupling 2, coiling motor 14, coiling motor 24, coiling reducer 13, coiling reducer 25, drum 125, drum 24, steering motor 1, steering motor 2, steering reducer 1, steering reducer 2, steering roll 1, and steering roll 2. The control system is a component of the rolling mill control system. The rolling mill control system includes measuring sensors, operating console 4, industrial computer 2, PLC 3, and control cabinet 5.

[0031] Both main motor 1 and main motor 2 are reversible motors. Main motor 1 drives the upper working roller through main reducer 1 and coupling 1, while main motor 2 drives the lower working roller through main reducer 2 and coupling 2. Main motor 1 and main motor 2 are controlled independently, and the ratio of the linear speeds of the upper and lower working rollers can be adjusted online by adjusting the speeds of main motor 1 and main motor 2.

[0032] Both the first winding motor and the second winding motor are reversible motors. The first winding motor drives the first winding drum through the first winding reducer, and the second winding motor drives the second winding drum through the second winding reducer.

[0033] The measuring sensors include a force sensor for measuring rolling force, an encoder for measuring the main motor speed, an encoder for measuring the winding motor speed, an encoder for measuring the steering motor speed, an encoder for measuring the steering roll speed, and a thickness gauge. The force sensor for measuring rolling force is located under the pressure screw and provides rolling force data for adjusting the roll gap. The encoders for measuring the main motor speed include encoder 17 and encoder 218, which are respectively mounted on the rotor shafts of main motor 1 and main motor 2. Their function is to measure the linear speed of the upper and lower work rolls. The measurement calculation formula is as follows: In the formula Working linear velocity (m / min) Main motor speed (rpm) The diameter of the work roll (mm) The main reducer's reduction ratio; encoders for measuring the winding motor speed include encoder 15 and encoder 23, which are installed on the rotor shafts of winding motor 1 and winding motor 2 respectively, and are used to measure the winding motor speed, calculate the roll diameter, strip length, and control the winding and unwinding tension; encoders for measuring the steering motor speed include encoder 12 and encoder 21, which are installed on the rotor shafts of steering motor 1 and steering motor 2 respectively, and are used to measure the steering motor speed, control the steering roller speed and output torque; encoders for measuring the steering roller speed include encoder 6 and encoder 31, which are installed on the operating side roller ends of steering roller 1 and steering roller 2 respectively, and are used to measure the steering roller speed for steering roller speed control and torque control; thickness gauges include thickness gauge 27 and thickness gauge 29, which are installed between steering roller 1 and the archway and between steering roller 2 and the archway respectively, and are used to measure the thickness at the entry and exit of the rolled piece for thickness control.

[0034] The industrial computer is equipped with a WinCC-configured human-machine interface for the control system. The interface includes input fields for the speed ratio i, target thickness h0, and forward slip correction coefficient. Input domain, backslip correction coefficient Input domain, allowable value of belt speed change sensitivity coefficient Input domain, allowable value of sensitivity coefficient to changes in bandwidth Input field, allowable thickness control accuracy Input domain, belt speed change calculation cumulative time Accumulated time calculation based on input domain and band length variation Input field. The control panel has a two-way switch for adjusting the rolling direction.

[0035] Before implementing the method for reducing surface scratches on ultra-thin metal strips caused by steering rollers according to the present invention, the output torques of steering motors one and two required to make the resistance torque of steering roller one and steering roller two zero are measured under different tensions and different steering roller linear speeds. Two-dimensional layer tables of steering roller one and steering roller two, indexed by tension and steering roller linear speed, are established based on the measured torques and stored in the industrial control computer. When implementing the method for eliminating the rotational resistance torque of steering rollers during ultra-thin metal strip rolling according to the present invention, the motor output torque under the corresponding state is obtained by looking up the table based on the measured tension and steering roller linear speed.

[0036] In this embodiment, the maximum limit of the velocity ratio is 2.0, the material of the rolled piece is 430 stainless steel, the thickness is 100μm, and the width is 100.0mm.

[0037] The specific implementation steps are as follows:

[0038] Step 1: Set the following basic control parameters: velocity ratio i = 1.1, target thickness h0 = 50 μm, and forward slip correction coefficient. Backslip correction coefficient Allowable value of belt speed change sensitivity coefficient Allowable value of sensitivity coefficient for band length variation Allowable values ​​for thickness control accuracy Calculation of cumulative time for belt speed change sensitivity coefficient Calculate the cumulative time using the sensitivity coefficient for band length variation. ;

[0039] Step 2: The mill starts rolling to the left. At this time, the upper work roll is a slow roll with a linear speed of 5 m / min and a speed ratio of [missing information]. The lower working roll is a high-speed roll with a linear speed of 5.5 m / min;

[0040] Step 3: Measure the main motor speed using encoder 2, and calculate the lower working roller linear speed using PLC and industrial computer; Calculation... Increment of inner high-speed roller speed ,Will Compared with the set allowable value of the belt speed change sensitivity coefficient Compare; if If it is determined that the rolling process is in the acceleration / deceleration stage, the steering roller adopts speed control mode, and the steering step is four; if It is determined that it is in the uniform speed rolling stage, and the steering roller adopts torque control mode, steering step six;

[0041] Step 4: Measuring the main motor speed using an encoder. The speeds of the lower and upper main motors are measured using an encoder, and the high-speed roller speed is calculated using a PLC and industrial computer. Slow roller linear speed Thickness gauge 2 and thickness gauge 1 measured the entry thickness H and exit thickness h of the rolled piece, respectively. Combined with the set forward slip correction coefficient, the results were... The backslip correction factor is Calculate the linear velocity of the front steering rollers respectively. Rear steering roller linear speed .when , When H = 99.8 μm and h = 79.9 μm, , ;

[0042] Step 5: The rotational speeds of the steering roller (using encoder 1), the take-up motor (using encoder 2), and the winding motor (using encoder 1 and encoder 2) are measured. The cumulative time is then calculated using a PLC and industrial computer. The arc of the inner front steering roller The arc of the rear steering roller Length of coiled strip and unwinding strip length .Will and Comparison, if and Increase the linear speed of the front steering roller; if and Reduce the linear speed of the front steering roller; if The linear velocity of the front steering roller remains constant. and Comparison, if and Increase the linear speed of the rear steering roller; if and Reduce the linear speed of the rear steering roller; if The linear speed of the rear steering roller remains constant. (Based on the set value) , ,when , , and At the same time, increase the linear speed of both the front and rear steering rollers. Steering step eight;

[0043] Step Six: Measure the rotational speed of steering rollers using encoder one and encoder two respectively. Calculate the linear velocity of the front steering roller using a PLC and industrial computer. Rear steering roller linear speed The front tension was obtained through actual measurement and calculation using PLC and industrial control computer. Post-tension PLC and industrial computer according to and Determine the required output torque of the front steering motor to eliminate the resistance torque of the front steering rollers by referring to the table. ,according to and Determine the required output torque of the rear steering motor to eliminate the resistance torque of the rear steering rollers by referring to the table. .when , , , At that time, referring to the table, the output torque of the front steering motor required to eliminate the resistance torque of the front steering roller is: The required output torque of the rear steering motor to eliminate the resistance torque of the rear steering roller is ;

[0044] Step 7: The rotational speeds of the steering roller 1, steering roller 2, take-up motor 1, and take-up motor 2 are measured using encoders 1 and 2 respectively. The cumulative time is then calculated using a PLC and an industrial control computer. The arc length of the inner front steering roller The arc length of the rear steering roller Length of winding belt and unwinding belt length .Will and Comparison, if and Increase the output torque of the front steering motor; if and Reduce the output torque of the front steering motor; if The output torque of the front steering motor remains unchanged. and Comparison, if and Increase the output torque of the steering motor; if and This reduces the output torque of the rear steering motor; if The output torque of the rear steering motor remains unchanged. (Based on the set value) , ,when , , and At this time, the output torque of the front steering motor remains unchanged, while the output torque of the rear steering motor decreases.

[0045] Step 8: Measure the main motor speed using encoder 2 and calculate the high-speed roller speed using PLC and industrial computer. ,when If the round is not yet finished, return to step three; when The course is now complete. Proceed to step nine.

[0046] Step 9: Use a thickness gauge to measure the actual exit thickness h of the rolled piece. Compare the measured exit thickness h with the target thickness h0. If... Change the rolling direction, simultaneously interchange the winding and unwinding, the front and rear steering rolls, and the fast and slow rolls; return to step three. Combine this with the set target thickness h0 = 50 μm and the allowable thickness control accuracy. ,when Then, change the rolling direction and repeat steps three through eight to continue rolling until the workpiece is thinned to the target thickness. .

[0047] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0048] The above description is only a specific embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A device for reducing surface scratches on extremely thin metal strips caused by guide rollers, characterized in that, The system includes a mechanical component and a control system. The mechanical component includes a steering motor, a steering motor, a steering reducer, a steering reducer, a steering roller, and a steering roller. The control system includes measuring sensors, an operating console, an industrial computer, a PLC, and a control cabinet. The industrial computer is equipped with a WinCC-configured human-machine interface (HMI) for the control system. The HMI includes input fields for the speed ratio i, target thickness h0, and forward slip correction coefficient. Input domain, backslip correction coefficient Input domain, allowable value of belt speed change sensitivity coefficient Input domain, allowable value of sensitivity coefficient to changes in bandwidth Input field, allowable thickness control accuracy Input domain, belt speed change calculation cumulative time Accumulated time calculation based on input domain and band length variation The input field includes a two-way switch for adjusting the rolling direction on the operating table.

2. The device for reducing surface scratches on extremely thin metal strips caused by steering rollers according to claim 1, characterized in that, Both steering motor one and steering motor two are reversible motors, located on both sides of the archway respectively. Steering motor one drives steering roller one through steering reducer one, and steering motor two drives steering roller two through steering reducer two.

3. The device for reducing surface scratches on extremely thin metal strips caused by the guide roller according to claim 1, characterized in that, The first and second steering rollers are hollow rollers with chrome plating. The chrome plating layer is greater than 50μm, the surface hardness is 800~1000HV, and the surface is polished with a roughness Ra = 0.01~0.015μm.

4. The method for reducing surface scratches on extremely thin metal strips caused by steering rollers as described in claim 1, characterized in that, The steps are as follows: Step 1: Set basic rolling parameters, including the speed ratio. Target thickness h0, forward slip correction coefficient Backslip correction coefficient Allowable value of belt speed change sensitivity coefficient Allowable value of sensitivity coefficient for band length variation Allowable values ​​for thickness control accuracy Calculation of cumulative time for belt speed change Calculate the cumulative time based on the change in belt length ; Step 2: Start the rolling mill, and the linear speeds of the upper and lower work rolls reach the set speed ratio. When the rolling mill enters the speed-up phase, during left-hand rolling, the upper work roll is the slow-speed roll and the lower work roll is the fast-speed roll; during right-hand rolling, the lower work roll is the slow-speed roll and the upper work roll is the fast-speed roll. The linear speed of the fast-speed roll is [a certain percentage] of that of the slow-speed roll. times; Step 3: According to Incremental speed of inner high-speed roller Determine the control mode of the steering roller and the rapid roller linear speed increment. Through formula The calculation shows that, in the formula and They are respectively The speed of the rapid roller at the start and end of the timing is calculated from the measured speed of the main motor. During the acceleration / deceleration rolling stage, the steering rollers adopt speed control mode, and the steering step is step four; if Then it is in the uniform speed rolling stage, the steering roller adopts torque control mode, and the steering step is six; Step 4: Steering roller speed control mode, set the reference value for the steering roller linear speed, and measure the actual linear speed of the high-speed roller. Slow roller linear speed The entry thickness H and exit thickness h of the rolled piece are set to a linear velocity of the front steering roller. The linear velocity of the rear steering roller is ; Step 5: Steering roller speed control mode. Determine the steering roller linear speed adjustment amount, measure the front steering roller speed and winding speed, and calculate the cumulative time using PLC and industrial computer. The arc length of the inner front steering roller and winding length ,if and Increase the linear speed of the front steering roller; if and Reduce the linear speed of the front steering roller; if With the linear velocity of the front steering roller remaining constant, the actual rotational speed of the rear steering roller and the unwinding speed were measured, and the cumulative time was calculated using a PLC and an industrial control computer. The arc length of the inner rear steering roller and unwinding belt length ,if and Increase the linear speed of the rear steering roller; if and Reduce the linear speed of the rear steering roller; if The linear speed of the rear steering roller remains unchanged, and the steering step is step eight. Step Six: Steering Roller Torque Control Mode. Set the steering motor output torque reference value and measure the linear velocity of the front steering roller. Rear steering roller linear speed Pretension and post-tension According to the linear speed of the front steering roller and pretension Determine the required output torque of the front steering motor to eliminate the resistance torque of the front steering rollers by referring to the table. According to the linear speed of the rear steering roller and post-tension Determine the required output torque of the rear steering motor to eliminate the resistance torque of the rear steering rollers by referring to the table. ; Step 7: Steering roller torque control mode. Determine the output torque adjustment of the steering motor, measure the front steering roller speed and winding speed, and calculate the cumulative time using PLC and industrial computer. The arc length of the inner front steering roller and winding length ,if and Increase the output torque of the front steering motor; if and Reduce the output torque of the front steering motor; if With the output torque of the front steering motor remaining constant, the actual measured speeds of the rear steering roller and unwinding speed were used to calculate the cumulative time via PLC and industrial computer. The arc length of the inner rear steering roller and unwinding belt length ,if and Increase the output torque of the steering motor; if and This reduces the output torque of the rear steering motor; if The output torque of the rear steering motor remains unchanged; Step 8: Determine if the pass has ended, and measure the actual speed of the high-speed roller. ,if If the round is not finished, return to step three; if The course is now complete. Proceed to step nine. Step 9: Determine if rolling is complete by measuring the exit thickness h of the rolled piece. If... Change the rolling direction, interchange the winding and unwinding, interchange the front and rear steering rollers, and interchange the fast and slow rollers, then return to step three; if Rolling is complete.

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