Method and system for setting motion of a roll train in a rolling mill

Abstract

The application discloses a kind of setting method and system of mill middle roll system action, it is related to metal rolling technical field, the setting method of the mill middle roll system action includes opening new buffer zone, receives the setting value information of next pass in advance in rolling process, determines the setting thickness and expected rolling force of workpiece. According to the expected rolling force and rebound parameter, the mill rebound value is calculated, the roll gap setting value and the displacement value of screwdown are calculated from the setting thickness of workpiece, then the displacement and timing process of only hydraulic roll system action and hydraulic and electric roll system action are determined according to the mill state. When the current pass steel signal ends, the positioning process of upper and lower roll system starts, and the setting change value calculated according to the measured value is only controlled on the hydraulic roll system. According to the setting method of mill middle roll system action provided by the application, the rolling efficiency is obviously improved and the stable rolling of limit product specification is realized by optimizing the roll system action process.

Description

Technical Field

[0001] This invention belongs to the field of metal rolling technology, specifically a method and system for setting the movement of the roller system in a rolling mill. Background Technology

[0002] Currently, in the production process of heavy plate rolling, the movement of the mill roll system determines the size of the roll gap, and roll gap control is the foundation for process quality, equipment stability, and efficiency improvement. In the existing roll gap setting control process, the mill system calculates a pass schedule based on rolling parameters, steel plate information, and measured temperature. The pass schedule includes the set rolling force and set thickness of the rolled piece for each pass. Then, based on the set rolling force and set thickness of the rolled piece, the total roll gap is calculated. Finally, combined with the rolling line calibrated at the roll gap zero point and the set offset value, the total roll gap is divided into two equal parts, which are operated by the upper and lower roll systems respectively.

[0003] However, since the calculated roll gap needs to be allocated to the upper and lower roll systems for operation, the roll gap allocation value is calculated from the zero point and rolling line calibrated by the rolling mill. Each time the relative position of the roll gap allocation changes greatly, the upper and lower roll systems need to be operated. Since the upper and lower roll systems are controlled by electromechanical pressing and hydraulic cylinders respectively, the action response speeds are very different, which restricts the improvement of rolling efficiency, especially failing to meet the rolling requirements of ultra-thin metal sheets. Summary of the Invention

[0004] The purpose of this invention is to provide a method and system for setting the movement of the rolling mill roll system, so as to solve at least one aspect of the problems and defects mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: In a first aspect, the present invention provides a method for setting the operation of a rolling mill roll system, wherein the rolling mill has a hydraulic roll system and an electric roll system arranged opposite to each other, and the hydraulic roll system is located below the electric roll system, the method comprising: A new buffer zone is opened, and the set value information of the next pass is received in advance during the rolling process to determine the set thickness and expected rolling force of the workpiece; The mill bounce value is calculated based on the expected rolling force and bounce parameters. The roll gap setting value and reduction displacement value are calculated based on the set thickness of the workpiece. Then, the displacement and timing process are determined based on the mill status, whether only the hydraulic roll system operates or both the hydraulic and electric roll systems operate. When the current pass ends with the steel-containing signal, the upper and lower roller systems start positioning according to the roller gap setting value. At the same time, the set change value calculated based on the measured value is controlled only on the hydraulic roller system.

[0006] As a further aspect of the present invention: when the roll gap setting value and the pressing displacement value are small, controlling the upward movement of the hydraulic roller system includes at least: When the roll gap setting value is greater than or equal to the first roll gap threshold, if the set pressing displacement value is less than the displacement limit, only the hydraulic roll system is controlled to move upward by the set pressing displacement value. If the set pressing displacement value is greater than or equal to the displacement limit, the hydraulic roll system is controlled to move upward by a part of the set pressing displacement value, and the electric roll system is controlled to move downward by another part of the set pressing displacement value. When the roll gap setting value is less than the first roll gap threshold, only the hydraulic roll system is controlled to move upward by the set pressing displacement value, or both the hydraulic roll system and the electric roll system are controlled to move upward, and the hydraulic roll system moves upward relative to the electric roll system by the set pressing displacement value.

[0007] As a further embodiment of the present invention: when the roll gap setting value is less than the second roll gap threshold, and the roll gap setting value will generate a rolling force containing a steel threshold after the action, the electric roll system is first controlled to move down a portion of the set pressing displacement value, and then the hydraulic roll system is controlled to move up another portion of the set pressing displacement value.

[0008] As a further embodiment of the present invention: when the actual roll gap generates a rolling force containing a steel threshold, first control the hydraulic roll system to open, then control the electric roll system to move down or up, and then control the hydraulic roll system to move up.

[0009] As a further embodiment of the present invention: if the required movement of the hydraulic roller system is greater than or equal to the stroke limit, the hydraulic roller system is controlled to move upward by a portion of the set pressing displacement value, and the electric roller system is controlled to move downward by another portion of the set pressing displacement value; if the required movement of the hydraulic roller system is less than the stroke limit, the hydraulic roller system is only controlled to move upward by the set pressing displacement value.

[0010] As a further embodiment of the present invention: the displacement of the hydraulic roller system is the sum of the position from the initial position to the roller table elevation and at least a portion of the set pressing displacement value and the rolling line height compensation value.

[0011] As a further embodiment of the present invention: when both the hydraulic roller system and the electric roller system are controlled to move upward, the electric roller system is first controlled to move upward by a first preset displacement value. After moving upward by a certain stroke, the hydraulic roller system is simultaneously controlled to move upward by a second preset displacement value. The difference between the second preset displacement value and the first preset displacement value is the set pressing displacement value.

[0012] As a further embodiment of the present invention: after the preset length of the current rolling pass is rolled, the set thickness information of the next pass is received, and the roll gap setting value and the reduction displacement value are calculated based on the initial thickness of the rolled piece or the actual thickness of the rolled piece and the set thickness.

[0013] As a further embodiment of the present invention: when the rolling force is less than the steel-containing threshold during the current rolling process, the hydraulic roller system and / or electric roller system are moved and positioned according to the pressing displacement value of the upper and lower roller systems. If the set thickness change value recalculated based on the measured value is less than or equal to the preset value, the required movement of the hydraulic roller system is added to the change value; if the change value is greater than the preset value, the hydraulic roller system and the electric roller system are positioned according to the pressing displacement value calculated based on the newly set thickness.

[0014] Secondly, the present invention provides a setting system for the movement of the rolling mill's roller system, comprising: The parameter determination module provides a setpoint information buffer, acquires information such as the setpoint of the workpiece, determines the setpoint thickness and expected rolling force of the workpiece, and provides mill bounce parameters; The calculation module calculates the mill bounce value based on the desired rolling force and mill bounce parameters, and calculates the roll gap setting value and reduction displacement value based on the workpiece set thickness and mill bounce value. Then, it determines the displacement and timing process for only hydraulic roll system operation and both hydraulic and electric roll system operation based on the mill status. The motion control module starts positioning the upper and lower roller systems according to the roll gap setting value when the current steel-containing signal ends. At the same time, it controls the hydraulic roller system to move based on the set change value calculated from the measured value.

[0015] As a further aspect of the present invention, it also includes: The detection module is used to detect the position information of the hydraulic roller system and / or electric roller system for positioning.

[0016] The present invention provides a method and system for setting the action of the rolling mill roll system, which has at least the following technical effects. The method for setting the action of the rolling mill roll system includes opening a new buffer zone, receiving the setting value information of the next pass in advance during the rolling process, determining the set thickness of the workpiece and the expected rolling force, calculating the mill bounce value based on the expected rolling force and bounce parameters, calculating the roll gap setting value and the reduction displacement value based on the set thickness of the workpiece, and determining the displacement and timing process of only hydraulic roll system action and both hydraulic and electric roll system action based on the mill status. When the steel-containing signal of the current pass ends, the upper and lower roll systems start the positioning process. At the same time, the set change value calculated based on the measured value is controlled only on the hydraulic roll system. By calculating the roll gap between the upper and lower roll systems, the method fully considers the factor that the positioning speed of the hydraulic roll system is fast while the positioning speed of the electric roll system is slow. The action timing of the hydraulic roll system and the electric roll system is reasonably allocated according to the size of the roll gap, shortening the positioning time of both, improving the rolling efficiency, meeting the stable rolling requirements of thin or ultra-thin plates, and ensuring product quality. Attached Figure Description

[0017] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of a portion of the structure of a rolling mill in the prior art; Figure 2A flowchart illustrating the method for setting the movement of the rolling mill's roller system according to an embodiment of the present invention; Figure 3 This is a diagram showing the relationship between the entry thickness of the workpiece and the set value of the roll gap in an embodiment of the present invention; Figure 4 This is a comparison diagram of the operation process of the existing roller system and the operation process of the roller system of the present invention; Figure 5 This is a diagram showing the module connection relationship of the setting system for the rolling mill roll system movement provided in an embodiment of the present invention.

[0019] Figure label: 10. Hydraulic roller system; 20. Electric roller system; 30. Roller conveyor; 40. Displacement sensor; 50. Hydraulic drive; 60. Motor drive. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0021] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and 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 limiting this invention.

[0022] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0023] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, and not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0026] like Figure 1 As shown, the existing rolling mill has a hydraulic roll system 10 and an electric roll system 20 arranged opposite to each other, with the hydraulic roll system 10 located below the electric roll system 20. Roller tracks 30 are located between the two. The hydraulic roll system 10 is hydraulically driven 50, allowing for fast movement and positioning. The electric roll system 20, driven by a motor 60, requires balancing and brake coordination, and its movement and positioning speed is much slower than that of the hydraulic roll system 10. Therefore, the connection and steps of the upper and lower roll systems cannot meet the requirements of fast-paced rolling, as well as the equipment stability requirements and final rolling temperature conditions needed for rolling long, thin steel plates with small roll gaps.

[0027] Firstly, please refer to Figures 2 to 4 As shown, this embodiment of the invention provides a method for setting the movement of the rolling mill's roller system, including the following steps: S100: Open a new buffer zone and receive the setting value information of the next pass in advance during the rolling process to determine the set thickness and expected rolling force of the workpiece.

[0028] S200. Calculate the mill bounce value based on the desired rolling force and bounce parameters. Calculate the roll gap setting value and reduction displacement value based on the set thickness of the workpiece. Then, determine the displacement and timing process for only hydraulic roll system operation and both hydraulic and electric roll system operation based on the mill status.

[0029] S300: When the steel-containing signal of the current pass ends, the upper and lower roller systems start positioning according to the roller gap setting value. At the same time, the set change value calculated based on the measured value is controlled only on the hydraulic roller system 10.

[0030] In this embodiment, the entry thickness H of the workpiece can be the set thickness or the actual thickness of the workpiece before rolling. The set thickness of the workpiece is the thickness of the workpiece after rolling. The mill bounce parameters are the mill bounce curve, mill bounce coefficient, etc.

[0031] The mill bounce value C can be calculated based on the expected rolling force and mill bounce parameters. Then, the roll gap setting value S0, which is the roll gap thickness, is obtained by subtracting the mill bounce value from the workpiece setting thickness. Finally, the set pressing displacement value, which is the total stroke required for pressing and positioning of the roll system in this pass, is obtained by subtracting the roll gap setting value from the workpiece inlet thickness.

[0032] Specifically, by calculating the roll gap between the upper and lower roll systems, taking into full account the fact that the hydraulic roll system 10 has a fast positioning speed while the electric roll system 20 has a slow positioning speed, the action sequence of the hydraulic roll system 10 and the electric roll system 20 is reasonably allocated according to the roll gap setting value and the magnitude of the pressing displacement value, thereby shortening the positioning time of both, improving rolling efficiency, meeting the stable rolling requirements of thin or ultra-thin plates, and ensuring product quality.

[0033] In some embodiments, controlling the upward movement of the hydraulic roller system, when the roll gap set value or the pressing displacement value is within a set allowable range, includes: S210. When the roll gap setting value is greater than or equal to the first roll gap threshold, if the set pressing displacement value is less than the displacement limit, then only the hydraulic roller system 10 is controlled to move upward by the set pressing displacement value. If the set pressing displacement value is greater than or equal to the displacement limit, then the hydraulic roller system 10 is controlled to move upward by a part of the set pressing displacement value, and the electric roller system 20 is controlled to move downward by another part of the set pressing displacement value.

[0034] S220. When the roll gap setting value is less than the first roll gap threshold, only the hydraulic roll system 10 is controlled to move upward by the set pressing displacement value, or both the hydraulic roll system 10 and the electric roll system 20 are controlled to move upward, and the hydraulic roll system 10 moves upward relative to the electric roll system 20 by the set pressing displacement value.

[0035] On the one hand, when rolling thick plates, if the set roll gap value is greater than or equal to the first roll gap threshold, and the set pressing displacement value is less than the displacement limit, meaning the total stroke required for positioning in this pass of the roll system is small, then only controlling the hydraulic roll system 10 to move upward by the set pressing displacement value can quickly reach the positioning requirement. If the set pressing displacement value is greater than or equal to the displacement limit, meaning the total stroke required for positioning in this pass of the roll system is large, and both the hydraulic roll system 10 and the electric roll system 20 need to move, then controlling the hydraulic roll system 10 to move upward by a portion of the set pressing displacement value, while simultaneously controlling the electric roll system 20 to move downward by another portion of the set pressing displacement value. The strokes of the hydraulic roll system 10 and the electric roll system 20 can be equal or unequal.

[0036] On the other hand, when rolling thin or ultra-thin plates, if the roll gap setting is less than the first roll gap threshold, meaning the total stroke required for positioning in this pass is smaller, in one example, only controlling the hydraulic roll system 10 to move upward by the set pressing displacement value can quickly reach the positioning requirement. In another example, controlling both the hydraulic roll system 10 and the electric roll system 20 to move upward, with the hydraulic roll system 10 moving upward relative to the electric roll system 20 by the set pressing displacement value, satisfies the rolling requirements of specific ultra-thin plates, thereby reducing the temperature drop of the steel plate, ensuring the final rolling temperature of the steel plate, and thus ensuring product quality.

[0037] It is worth noting that, on the one hand, by minimizing the movement of the electric roller system 20, the positioning of the mill roll gap is accelerated, and the rolling rhythm is improved; on the other hand, in order to meet the special rolling process and stabilize the rolling of ultra-thin plates, the stability of the equipment is improved.

[0038] In some embodiments, when the roll gap setting value is less than the second roll gap threshold, and the roll gap setting value will generate a rolling force containing a steel threshold after the action, the electric roll system 20 is first controlled to move down a portion of the set pressing displacement value, and then the hydraulic roll system 10 is controlled to move up another portion of the set pressing displacement value.

[0039] Specifically, if the roll gap setting value is less than the second roll gap threshold, it means that when rolling a thick plate into a thin plate, the simultaneous operation of the upper and lower roll systems may cause the rolls to stick together, generating rolling force that prevents the electric roll system 20 from operating and the roll gap from being in place. In this case, the electric roll system 20 is first pressed down to the set roll gap, and then the hydraulic roll system 10 is operated to the set roll gap, thereby ensuring that the roll gap is in place when the upper and lower roll systems stick together in the small roll gap of the ultra-thin plate.

[0040] In some embodiments, when the actual value of the roll gap is less than the second roll gap threshold, the hydraulic roll system 10 is first controlled to open and move down a certain stroke, then the electric roll system 20 is controlled to move down or up, and then the hydraulic roll system 10 is controlled to move up.

[0041] Specifically, when the actual value of the roll gap is less than the second roll gap threshold, the rolling force exceeds the steel-containing threshold before the roll gap is activated. The electric roll system 20 cannot operate when the brake is opened. First, the lower roll system hydraulic cylinder is activated to open a certain stroke. After the rolling force disappears, the hydraulic roll system 10 is then controlled to operate.

[0042] In some embodiments, if the required movement of the hydraulic roller system 10 is greater than or equal to the stroke limit, the hydraulic roller system 10 is controlled to move upward by a predetermined pressing displacement value, and the electric roller system 20 is controlled to move downward by another predetermined pressing displacement value. If the required movement of the hydraulic roller system 10 is less than the stroke limit, the hydraulic roller system 10 is only controlled to move upward by the predetermined pressing displacement value.

[0043] Specifically, when the required movement of the hydraulic roller system 10 exceeds its own protection stroke, the set pressing displacement value needs to be allocated to both the hydraulic roller system 10 and the electric roller system 20, meaning both need to move. When the required movement of the hydraulic roller system 10 does not exceed its own stroke, only the hydraulic roller system 10 needs to move upward.

[0044] In some embodiments, the displacement of the hydraulic roller system 10 is the sum of the position from the initial position to the roller table elevation and at least a partially set pressing displacement value and rolling line height compensation value.

[0045] Specifically, the height of the rolling line in this pass, i.e. the working position of the hydraulic roller system 10, can be determined by the initial position of the hydraulic roller system 10 reaching the roller table elevation, plus the pressing amount of the hydraulic roller system 10 in this pass and the rolling line height compensation value. Then, the roller gap to be operated by the hydraulic cylinder in this pass can be initially obtained from the position of the hydraulic cylinder during the roller gap calibration. The remaining roller gap is completed by the electric pressing action of the electric roller system 20.

[0046] In some embodiments, when both the hydraulic roller system 10 and the electric roller system 20 are moved upward, the electric roller system 20 is first moved upward by a first preset displacement value, and after moving upward by a certain displacement, the hydraulic roller system 10 is simultaneously moved upward by a second preset displacement value. The difference between the second preset displacement value and the first preset displacement value is the set pressing displacement value.

[0047] Specifically, when the roll gap is small, the calculated roll gap requires the hydraulic roll system 10 and the electric roll system 20 to move upwards simultaneously. Since the hydraulic action is faster than the electric pressing action, to avoid the upper and lower rolls sticking together and generating rolling force when the roll gap is moved, the electric roll system 20 can be moved upwards by a certain displacement first to ensure that there is no sticking to the rolls, and then the hydraulic roll system 10 can be controlled to move upwards at the same time.

[0048] In some embodiments, after the current pass has rolled a preset length, the system begins to receive the set thickness value information for the next pass and stores it in a newly opened buffer so that the hydraulic roll system 10 and / or the electric roll system 20 can pre-calculate the roll gap and determine the timing of the operation.

[0049] Specifically, when the steel plate is rolled to a certain length in this pass, the rolling mill receives relevant information such as the set thickness of the workpiece for the next pass in advance. Based on the set thickness of the workpiece and the current state of the rolling mill, it calculates and allocates the roll gap setting values ​​of the upper and lower roll systems in advance. Before the steel-containing signal ends, the calculation and allocation of the set thickness of the workpiece to the set roll gap of the upper and lower roll systems is completed, thereby realizing continuous rolling production more efficiently.

[0050] Furthermore, in this embodiment, the initial thickness of the rolled piece or the actual thickness of the rolled piece after the previous rolling pass is obtained, and the actual reduction displacement value is calculated based on the initial thickness of the rolled piece or the actual thickness of the rolled piece and the roll gap setting value.

[0051] After rolling is completed, the secondary model system will recalculate the new set thickness and other information based on the rolling measurement values. If the difference between the original set thickness and the recalculated set thickness is less than or equal to the preset value, both the hydraulic roller system 10 and the electric roller system 20 will move according to the original set pressing displacement value, or the change value will be fully compensated by the displacement value of the hydraulic roller system 10. If the difference is greater than the preset value, the required movement of the hydraulic roller system 10 will be added to the difference.

[0052] Specifically, the set thickness and other information can be recalculated using the current rolling measurement data of the workpiece, and a new pressing displacement value can be recalculated. By comparing it with the original set pressing displacement value, if the difference is small, the hydraulic roller system 10 and the electric roller system 20 will still move according to the original set pressing displacement value, or the displacement value of the hydraulic roller system 10 will be directly compensated according to the position of the roller system. If the difference is large, the compensation will be added to the stroke of the hydraulic roller system 10, thereby avoiding secondary positioning of the electric roller system 20 and ensuring the rolling rhythm. That is, the set thickness of the current pass is corrected and adjusted using the actual data of the previous pass to ensure that the actual thickness of the rolled steel plate is basically consistent with the set thickness of the workpiece, further ensuring product quality.

[0053] In a specific embodiment, such as Figure 4 As shown, a steel plate intermediate billet (initial thickness 66mm) needs to be rolled to a target thickness of 6.1mm. The steel plate gradually reaches the target thickness by going through 7 reciprocating rolling passes on the rolling mill.

[0054] In the first pass (roll gap set at 49.1mm), the steel plate is rolled from the mill inlet to the outlet. When the steel plate is rolled to 60% of its length, the pass jumps to the second pass, receiving the set thickness information for the second pass (including the set thickness of the rolled piece and the desired rolling force). During subsequent rolling processes, the set thickness of the second pass (49.1mm at the inlet, 33.5mm at the outlet) is pre-allocated to the upper and lower roll systems using the roll gap settings (calculating mill bounce value, total roll gap value, and current pass reduction displacement value, etc., to calculate the roll gap set values ​​for the upper and lower roll systems respectively). This process takes approximately 0.6 seconds. After the first pass rolling ends (the steel signal disappears), the upper and lower roll systems can operate according to the allocated roll gap set values. This saves approximately 0.6 seconds compared to the original method, as it saves time in receiving the second pass's procedure table and allocating the roll gap between the upper and lower roll systems. The upper roll system is an electric roll system (20 units), and the lower roll system is a hydraulic roll system (10 units).

[0055] The second and third rolling passes (roll gap set at 33.5 mm) are processed in the same way as the first pass, receiving the pass schedule and upper and lower roll gap allocation in advance. The following control procedures are added for the passes involving the upper and lower roll systems: (1) Especially when rolling medium and heavy plates, the roll gap calculated and allocated by the upper roll system is sometimes small. In order to speed up the roll gap positioning, if the pre-calculated roll gap allocation value of the upper roll system (i.e., the partially set pressing displacement value) is less than 5mm (i.e., the preset pressing displacement limit), then the lower roll system will move all the roll gaps, while the upper roll system remains stationary. On average, this can save 1 to 2 passes of time per piece of steel when the upper roll system is not moving, about 1 to 2 seconds.

[0056] (2) After each rolling pass, the secondary model system recalculates based on the rolling data. The result of the recalculation triggers the calculation and allocation of the roll gap between the upper and lower roll systems, and its value may trigger the secondary positioning of the upper roll system. Therefore, except for the last pass, the recalculated set thickness change (i.e., the difference) is less than 1mm (i.e., the preset value). After the upper and lower roll systems are in position, the roll gap control does not adopt the thickness change value; otherwise, the lower roll system directly performs the change compensation. When the recalculated set thickness change is less than 3mm, or the set thickness is less than 5mm and the upper roll system has already moved in this pass, the set thickness change value is all moved by the lower roll system to avoid the secondary positioning of the upper roll system. On average, each piece of steel can save the time of the upper roll system not moving for one pass, about 1 second.

[0057] In the fourth pass (roll gap set at 12.8mm), as the steel plate becomes thinner and cools down faster, in order to further accelerate the rolling process and ensure the rolled plate shape, when the roll gap set value minus the mill bounce value is less than 13mm, all the roll gaps in the subsequent passes are allocated to the lower roll system (except when the hydraulic stroke of the lower roll system exceeds the limit), while the upper roll system remains unchanged. Compared with the original situation where both the upper and lower roll systems were activated, the roll gap preparation for each pass can be reduced by about 1 second, which further ensures the smooth rolling of thin plates.

[0058] The 5th (roll gap setting value 9.2mm), 6th (roll gap setting value 7.0mm), and 7th (roll gap setting value 6.1mm) roller gap control is performed in accordance with the 1st and 4th roller gaps. That is, the next roller gap table is received in advance, and all roller gaps are allocated to the lower roller system (the upper roller system remains stationary, and the hydraulic cylinder of the lower roller system moves upward to the height corresponding to the downward displacement value).

[0059] In the last two passes of thin plate rolling, the small roll gap may cause the upper and lower rolls to stick together and generate rolling force (the actual roll gap setting value is generated by the mill bounce). When all subsequent passes are operated by the lower roll system, if the hydraulic stroke of the lower roll system exceeds the range (25mm~65mm), the upper roll system needs to cooperate to complete the operation. If the rolling force generated by the sticking rolls will cause the electric pressing action of the upper roll system to be incomplete, then the priority sequence of the upper and lower roll systems needs to be considered according to the actual roll gap operation.

[0060] (1) Based on the bounce calculation of the current pass, if the upper and lower roll systems come into contact and generate a certain rolling force, first let the upper roll system be electrically pressed down to the calculated roll gap, and then let the lower roll system be hydraulically moved to the set roll gap. (2) There is a large rolling force before the rolling gap. The upper roll system cannot move when the brake is opened. First, let the lower roll system hydraulic cylinder move to open and release the pressure. After the rolling force disappears, the upper roll system moves.

[0061] (3) When the roll gap is small, the roll gap calculated requires the upper and lower roll systems to move upwards simultaneously. Since the hydraulic action is faster than the electric pressing action, to avoid the upper and lower rolls from sticking together and generating rolling force when the roll gap is moved, the upper roll system is first pressed down by electric force to move upwards until the lower roll system hydraulic cylinder moves when there is no sticking together according to the calculated value. The two move upwards relative to each other to the set displacement value.

[0062] The above improvements address the coordination and control issues of the upper and lower roller systems when the entire process of thin sheet production is controlled by the hydraulic operation of the lower roller system. This prioritizes the rapid hydraulic response of the lower roller system and avoids problems such as incomplete roller gap or inability to open the roller gap caused by roller contact at a gap of about 5-6mm.

[0063] The main advantage of this design for the movement of the upper and lower roller systems is that: (1) The set thickness of all steel plates for all passes is received in advance during the steel plate rolling process, and the roll gap of the upper and lower roll systems is calculated and allocated, which can save 0.6 seconds per pass; (2) Based on the calculated gap between the upper and lower roller systems in advance, when the upper roller system has a small travel, the lower roller system will be used to operate, saving the positioning time of this pass (about 1 second can be saved per piece of steel on average). (3) The thickness change is recalculated for the rolled steel plate, and the roll gap is recalculated and allocated. Based on the fastest roll gap control action time, the action is completed by the lower roll system under the condition of meeting the process requirements (about 1 second can be saved per piece of steel on average). (4) When the thickness of the rolled thin plate is controlled to a certain extent, the roll gap is all operated by the lower roll system, which can save 1 second per pass, not only speeding up the rolling rhythm of the steel plate, but also realizing the conventional rolling of ultra-thin plates.

[0064] In summary, the method for setting the movement of the rolling mill roll system provided by the embodiments of the present invention, on the one hand, saves the preparation process for rolling mill roll gap positioning, reduces the movement of the upper roll system and avoids secondary positioning of the upper roll system, thereby maximizing the rolling rhythm; on the other hand, it solves the problem of unplanned rolling of thin plates due to temperature drop and the contact of the upper and lower roll systems.

[0065] Secondly, such as Figure 5 As shown, this embodiment of the invention also provides a setting system for the movement of the roll system in a rolling mill, which automates the roll gap movement setting method and timing control. The setting system includes: The parameter determination module provides a set value information buffer, acquires information such as the set value of the workpiece, determines the set thickness and expected rolling force of the workpiece, and provides mill bounce parameters.

[0066] The calculation module calculates the mill bounce value based on the desired rolling force and mill bounce parameters, and calculates the roll gap setting value and reduction displacement value based on the workpiece set thickness and mill bounce value. Then, based on the mill status, it determines the displacement and timing process for when only the hydraulic roll system 10 operates and when both the hydraulic and electric roll systems operate.

[0067] The motion control module starts positioning the upper and lower roller systems according to the roll gap setting value when the steel-containing signal of the current pass ends. At the same time, it controls the hydraulic roller system 10 to move based on the set change value calculated from the measured value.

[0068] Specifically, the parameter determination module may include a data acquisition unit, a data input unit, etc. The calculation module may include a processing unit and a computation unit for data processing. The motion control module may include a control unit and a drive unit for controlling the movement of the hydraulic roller system 10 and the electric roller system 20. The specific types of the parameter determination module, calculation module, and motion control module can be determined according to actual needs, and this embodiment does not impose specific limitations.

[0069] The rolling mill roll system setting system provided in this embodiment of the invention realizes the conversion of the set thickness of the rolled workpiece into the calculation and timing control of the roll gap between the upper and lower roll systems. It fully considers the factor that the hydraulic roll system 10 has a fast positioning speed while the electric roll system 20 has a slow positioning speed. According to the size of the roll gap, the action timing of the hydraulic roll system 10 and the electric roll system 20 is reasonably allocated, shortening the positioning time of the two, improving the rolling efficiency, and meeting the stable rolling requirements of thin or ultra-thin plates, thus ensuring the quality of the products.

[0070] In some embodiments, the system further includes a detection module for detecting position information of the hydraulic roller system 10 and / or the electric roller system 20 for positioning.

[0071] Specifically, the detection module may include a position sensor 40. For example, the moving ends of the hydraulic roller system 10 and the electric roller system 20 are both equipped with position sensors 40, which can detect specific positions and facilitate roller gap positioning.

[0072] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A method for setting the movement of the rolling mill's roller system, characterized in that, include: A new buffer zone is opened, and the set value information of the next pass is received in advance during the rolling process to determine the set thickness and expected rolling force of the workpiece; The mill bounce value is calculated based on the expected rolling force and bounce parameters. The roll gap setting value and the pressing displacement value are calculated based on the set thickness of the rolled piece. Then, the displacement and timing process are determined based on the mill status, whether only the hydraulic roll system (10) operates or both the hydraulic roll system (10) and the electric roll system (20) operate. When the current steel-containing signal ends, the upper and lower roller systems start positioning according to the roller gap setting value, and the set change value calculated based on the measured value is controlled only on the hydraulic roller system (10); When the roll gap setting value is less than the second roll gap threshold, and the roll gap setting value will generate a rolling force steel-containing threshold value after the action, the electric roll system (20) is first controlled to move down a portion of the set pressing displacement value, and then the hydraulic roll system (10) is controlled to move up another portion of the set pressing displacement value. The displacement of the hydraulic roller system (10) is the sum of the position from the initial position to the roller table elevation and at least part of the set pressing displacement value and the rolling line height compensation value; When the rolling force is less than the steel-containing threshold during the current rolling process, the hydraulic roller system (10) and / or the electric roller system (20) are moved and positioned according to the displacement value of the upper and lower roller systems. If the set thickness change value calculated based on the measured value is less than or equal to the preset value, the required movement of the hydraulic roller system (10) is added to the change value; if the change value is greater than the preset value, the hydraulic roller system (10) and the electric roller system (20) are positioned according to the pressing displacement value calculated by the new set thickness.

2. The method for setting the movement of the rolling mill roll system according to claim 1, characterized in that, When the roll gap setting value and the pressing displacement value are small, controlling the hydraulic roller system (10) to move upward includes at least: When the set value of the roll gap is greater than or equal to the first roll gap threshold, if the set pressing displacement value is less than the displacement limit, then only the hydraulic roller system (10) is controlled to move up the set pressing displacement value. If the set pressing displacement value is greater than or equal to the displacement limit, then the hydraulic roller system (10) is controlled to move up a portion of the set pressing displacement value, and the electric roller system (20) is controlled to move down another portion of the set pressing displacement value. When the set value of the roll gap is less than the first roll gap threshold, the hydraulic roller system (10) is controlled to move up by the set pressure displacement value, or the hydraulic roller system (10) and the electric roller system (20) are both controlled to move up, and the hydraulic roller system (10) moves up relative to the electric roller system (20) by the set pressure displacement value.

3. The method for setting the movement of the rolling mill roll system according to claim 2, characterized in that, When the actual roll gap generates a rolling force containing the steel threshold, first control the hydraulic roll system (10) to open, then control the electric roll system (20) to move down or up, and then control the hydraulic roll system (10) to move up.

4. The method for setting the movement of the rolling mill roll system according to claim 2, characterized in that, If the required movement of the hydraulic roller system (10) is greater than or equal to the stroke limit, the hydraulic roller system (10) is controlled to move upward by a portion of the set pressing displacement value, and the electric roller system (20) is controlled to move downward by another portion of the set pressing displacement value; if the required movement of the hydraulic roller system (10) is less than the stroke limit value, the hydraulic roller system (10) is only controlled to move upward by the set pressing displacement value.

5. The method for setting the movement of the rolling mill roll system according to claim 2, characterized in that, When both the hydraulic roller system (10) and the electric roller system (20) are moved upward, the electric roller system (20) is first moved upward by a first preset displacement value. After moving upward by a certain stroke, the hydraulic roller system (10) is simultaneously moved upward by a second preset displacement value. The difference between the second preset displacement value and the first preset displacement value is the set pressing displacement value.

6. The method for setting the movement of the rolling mill roll system according to claim 1, characterized in that, After the preset length of the current pass is rolled, the set thickness information for the next pass is received. The roll gap setting value and the reduction displacement value are calculated based on the initial thickness or actual thickness of the workpiece and the set thickness.

7. A setting system for the movement of the rolling mill's roller system, characterized in that, A method for setting the action of the rolling mill roll system as described in any one of claims 1 to 6, comprising: The parameter determination module provides a setpoint information buffer, acquires the setpoint information of the workpiece, determines the setpoint thickness and expected rolling force of the workpiece, and provides mill bounce parameters; The calculation module calculates the mill bounce value based on the expected rolling force and the mill bounce parameter, and calculates the roll gap setting value and the pressing displacement value based on the set thickness of the rolled piece and the mill bounce value. Then, it determines the displacement and timing process based on the mill status, whether only the hydraulic roll system (10) operates or both the hydraulic roll system (10) and the electric roll system (20) operate. The motion control module starts positioning according to the roll gap setting value when the current steel-containing signal ends. At the same time, it controls the hydraulic roll system (10) to move based on the set change value calculated from the measured value.

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