A rolling schedule calculation method
By decomposing the rolling process into a unidirectional motion process and dividing the velocity stages by acceleration, the rolling motion sequence is digitally calculated, solving the problem of low accuracy in the calculation of rolling sequence in the prior art, and realizing accurate simulation and online control optimization of the rolling process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CISDI ENGINEERING CO LTD
- Filing Date
- 2023-09-22
- Publication Date
- 2026-05-29
AI Technical Summary
Existing rolling timing calculation methods cannot accurately obtain the correspondence between position and time during the movement of the rolled piece, resulting in low production efficiency and control accuracy, and failing to accurately simulate the change of position of the rolled piece over time.
The rolling process is decomposed into several unidirectional motion processes and divided into different speed stages based on the magnitude of acceleration. By calculating the starting speed, acceleration, travel distance, and travel time of each stage, the rolling process is digitally described, and a rolling motion time sequence diagram is drawn to accurately obtain the positional relationship between adjacent rolling pieces and the operating sequence of the main equipment.
It improved the accuracy of temperature change prediction during the rolling process, optimized the equipment layout and selection of the production line, improved online control accuracy and production efficiency, and enhanced product quality and economic benefits.
Smart Images
Figure CN117371186B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of steel rolling production control technology and relates to a method for calculating rolling timing. Background Technology
[0002] Rolling sequence reflects the change in the position of the rolled piece over time during the steel rolling process. It can also be used to obtain information on the spatial and time intervals between adjacent rolled pieces, as well as the operational sequence of key equipment in the steel rolling production line, such as descaling sequence and motor power sequence. In the production line planning and design phase, accurate rolling sequence calculations provide crucial information for equipment layout and selection. In the production operation phase, accurate rolling sequence calculations optimize rolling schedules, improve production line efficiency and capacity, and effectively enhance the accuracy of online process control, ultimately improving product quality and economic benefits.
[0003] Currently, rolling timing calculations typically employ online tracking methods, which use signal detection at multiple locations on the production line to obtain the correspondence between the position and time of the rolled piece during its movement. However, due to the limited number of detection points, it is difficult to accurately obtain the moment when the rolling mill arrives at each point on the production line during its movement, and it is also impossible to accurately predict the relative positional relationship between adjacent rolled pieces. This has become one of the limiting factors for improving production efficiency and control accuracy.
[0004] In offline calculations, the position of the workpiece changes over time by calculating the movement time of the workpiece between various equipment and the rolling time of each rolling pass. This is then used to calculate the temperature changes, rolling cycle, and running time of the main equipment during the rolling process, and to verify the rationality of the equipment spacing. This calculation method is primitive and crude, and cannot accurately simulate the position change of the workpiece over time during its movement. The calculation accuracy and efficiency are very low.
[0005] In order to accurately calculate the temperature changes during the rolling process, accurately calculate the positional relationship between adjacent rolled pieces, accurately obtain the operating sequence of the main equipment, provide theoretical support for verifying the rationality of equipment layout and equipment selection, and provide means for optimizing production rhythm and improving control precision, a new and accurate rolling sequence calculation method is urgently needed. Summary of the Invention
[0006] In view of this, the purpose of this invention is to provide a precise rolling timing calculation method to accurately predict the changes in the position of the rolled piece over time, thereby improving the accuracy of temperature change prediction during the rolling process and accurately obtaining the positional relationship between adjacent rolled pieces and the running sequence of the main equipment. This provides theoretical support for offline calculation and verification of the rationality of production processes, equipment layout, and equipment selection, and provides a means for online control to optimize production rhythm and improve control accuracy, thereby improving product quality and economic benefits.
[0007] To achieve the above objectives, the present invention provides the following technical solution:
[0008] A method for calculating rolling timing specifically includes the following steps:
[0009] S1: Construct a time series of pairs (x) based on the workpiece coordinates and motion times. j ,t j Add the initial position and initial time pair (x0, t0) of the rolled piece to the time sequence list;
[0010] S2: Determine the speed system of the workpiece movement, and decompose the entire workpiece movement process into several unidirectional movement processes according to whether the workpiece moves along or against the rolling direction;
[0011] S3: Divide each unidirectional motion process into different speed stages based on the magnitude of acceleration, and calculate the starting speed, acceleration, travel distance and travel time of each speed stage in turn. Digitize the complex workpiece motion process with a few variable sequences, and on this basis, calculate the motion timing of each unidirectional motion process segment by segment.
[0012] S4: After calculating the timing of the entire movement process of the rolled piece, use the rolled piece coordinates and movement time in the timing pair as the horizontal and vertical axes to draw the timing diagram of the rolled piece movement process.
[0013] Furthermore, in step S1, the initial position of the rolled piece includes: the coordinates of the head, tail, middle or any other point on the rolled piece, so as to calculate the timing of the head, tail, middle or any other point on the rolled piece, and draw a timing diagram of one or more points on the rolled piece.
[0014] Furthermore, in step S3, the motion timing of each unidirectional motion process is calculated segment by segment, specifically including the following steps:
[0015] S31: For a certain unidirectional motion process, divide it into velocity stages and count the number of velocity stages N;
[0016] S32: Calculate the velocity parameters of the unidirectional motion process sequentially, including the initial velocity V of each velocity stage. i acceleration a i, distance of movement ΔL i and the movement time ΔT i , (i∈[1,N]);
[0017] S33: Calculate the cumulative distance traveled in one direction before the start of each speed stage:
[0018] S34: Obtain the time-series logarithm (x) at the starting point of the unidirectional motion process (i.e., the initial position of the workpiece or the end point of the previous unidirectional motion process). last ,t last ), where x last Let t be the coordinate position of the workpiece at the starting point of the current unidirectional motion process. last This refers to the moment when the workpiece is at the starting point of the current unidirectional motion process;
[0019] S35: Calculate the timing of the workpiece movement during the rolling process, specifically including:
[0020] S351: Determine the total distance traveled in a unidirectional motion process Using the timing calculation step size ΔS, the number of timing points m required for the unidirectional motion process is calculated, and its value is not less than... The smallest integer;
[0021] S352: For the m time points required to be calculated in a unidirectional motion process, calculate their movement distances relative to the starting position of the current unidirectional motion process in sequence:
[0022] S353: Search for each velocity stage of the unidirectional motion process, when L i <S k ≤L i+1 When the workpiece reaches the k-th time point, it is at the i-th velocity stage of the current unidirectional motion process. The distance the workpiece moves at the k-th time point in the i-th velocity stage is ΔS. k =S k -L i ;
[0023] S354: Calculate the moving speed of the workpiece when it reaches the kth timing point:
[0024] S355: Calculate the motion time of the workpiece relative to the starting point of the current unidirectional motion process when it moves to the kth timing point.
[0025]
[0026] S356: Based on the direction of the current unidirectional motion process, determine the position coordinates of the kth time point as follows:
[0027]
[0028] S357: Add time series pairs (x) to the time series pair sequence list k ,t last +Δt k );
[0029] S358: After calculating the m-th timing point, return to step S31 to perform timing calculation for the next unidirectional motion process.
[0030] Furthermore, in step S31, when dividing the velocity stages, the entire motion process is divided according to the magnitude of acceleration. A segment of motion process with the same acceleration is divided into a velocity stage, and the acceleration values of two adjacent velocity stages are different.
[0031] Furthermore, in step S32, the starting speed of the first speed stage must be given, and the starting speed of each subsequent speed stage is: V i+1 =V i +a i ΔT i (1<i≤N); acceleration a i , distance of movement ΔL i and the movement time ΔT i It is either given information or solved using the basic formulas of kinematics based on other known conditions.
[0032] Furthermore, in step S4, when calculating the movement sequence of the rolled pieces during the rolling process, based on the calculated or given rolling cycle of adjacent rolled pieces, the initial time is taken as the time when the first rolled piece begins to move. The head and tail sequence of each rolled piece are calculated sequentially, and the head and tail sequence diagrams of multiple rolled pieces are drawn, thereby obtaining the change law of the relative positional relationship between the rolled pieces.
[0033] Furthermore, in step S4, the change law of the relative positional relationship between the rolled pieces is obtained, specifically including: based on the head and tail time sequence of multiple rolled pieces, the head coordinate of the next rolled piece at the same time is subtracted from the tail coordinate of the previous rolled piece when it arrives at each time sequence calculation point, that is, the change law of the spatial interval between adjacent rolled pieces is obtained, or the time difference between the tail of the previous rolled piece and the head of the next rolled piece arriving at each time sequence calculation point is calculated, that is, the change law of the time interval between adjacent rolled pieces is obtained.
[0034] Furthermore, in step S4, after giving the coordinates of the key equipment, the arrival and departure times of each piece of rolling mill are calculated based on the head and tail timing of adjacent pieces, which enables the plotting of the key equipment production operation sequence diagram, such as the descaling sequence diagram and the motor power sequence diagram.
[0035] The beneficial effects of this invention are as follows:
[0036] 1) This invention divides the rolling process into several unidirectional motion processes, and then divides each unidirectional motion process into smaller stages based on the magnitude of acceleration. By calculating the starting speed, acceleration, moving distance, and moving time of each stage, the speed system of the complex rolling process can be digitized with a few variable sequences, accurately describing the rolling process, accurately calculating the rolling motion sequence during the rolling process, and greatly improving the calculation efficiency.
[0037] 2) By using the rolling timing calculation method of the present invention, the timing of any position of the rolled piece can be calculated. For example, by calculating the timing of the head and tail of the rolled piece and drawing the timing diagram, the positional changes and extension of the rolled piece during the production process can be predicted intuitively.
[0038] 3) By using the rolling timing calculation method of the present invention, the rolling head and tail timing diagrams of adjacent rolling pieces can be calculated and drawn, and the interference in the rolling production process can be analyzed intuitively. This is beneficial to optimize the production line equipment layout scheme, optimize the rolling rhythm, increase production capacity, and improve the accuracy of online control.
[0039] 4) By using the rolling timing calculation method of the present invention, the arrival and departure times of the rolled pieces from the main equipment of the production line can be accurately calculated, thereby calculating the running sequence of the main equipment, drawing descaling timing diagrams, motor power timing diagrams, etc., providing a theoretical basis for equipment selection and optimized control strategies.
[0040] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description
[0041] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:
[0042] Figure 1 This is a schematic diagram of the equipment layout for a hot continuous rolling production line;
[0043] Figure 2 This is a timing diagram of the hot strip rolling process.
[0044] Figure 3 This is a descaling timing diagram of the rolling process, drawn based on the rolling sequence diagram.
[0045] Figure 4 This is a diagram of the impact load (power timing diagram) of the main motor of the rolling mill during the rolling process, drawn based on the rolling stock timing diagram.
[0046] Figure 5The user interface for the mother plate shearing and collision analysis software in the hot-roll mill coil rolling production mode.
[0047] Figure 6 A graph showing the speed curve of the mother plate in the final pass of the hot-roll mill coil rolling production mode.
[0048] Figure 7 A timing diagram for the final pass length shearing of two adjacent finished steel plates in the hot-roll mill coil rolling production mode;
[0049] Figure 8 The time interval curve for the final pass length shearing of two adjacent finished steel plates in the hot-roll mill coil rolling production mode.
[0050] Figure 9 The spatial gap curve for the final pass length shearing of two adjacent finished steel plates in the hot-roll mill coil rolling production mode.
[0051] Figure 10 The curves showing the minimum spatial gap between two adjacent finished steel plates under different length conditions during the final pass of the hot-roll mill coil rolling production mode as a function of rolling speed.
[0052] Figure 11 The curves showing the change in the spatial gap between the tail of the first steel plate and the second steel plate at the exit of the straightener under different fixed length conditions during the final pass of the hot-rolled coil rolling production mode of the hot-rolled coil mill as a function of rolling speed.
[0053] Figure 12 The curves showing the spatial gap between the first and second finished steel plates at the moment the first steel plate completes the cooling bed operation and the second steel plate under different length conditions during the final pass of the hot rolling mill for the production mode of hot rolling mill coil shearing are as a function of rolling speed.
[0054] In the attached diagram, 1 is the slab heating furnace, 2 is the roughing descaling box, 3 is the fixed-width press, 4 is the roughing mill stand, 5 is the insulation cover, 6 is the flying shear, 7 is the finishing descaling box, 8 is the finishing mill stand, 9 is the post-rolling cooling device, and 10 is the coiler. Detailed Implementation
[0055] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0056] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.
[0057] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present 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, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.
[0058] Example 1:
[0059] The rolling timing calculation method of this invention is used to simulate and calculate the rolling sequence of the workpiece during the rolling process. For example... Figure 1 As shown, the main equipment of a hot continuous rolling production line along the rolling direction are, in sequence, a slab heating furnace 1, a roughing descaling box 2, a fixed width press 3, two single-pass reversible roughing mill stands 4, a heat insulation cover 5, a flying shear 6, a finishing descaling box 7, a seven-stand continuous finishing mill 8, a post-rolling cooling device 9, and a coiler 10. During hot rolling production, the high-temperature slab exits the slab heating furnace 1 and is moved laterally onto the roller table of the rolling production line. It then moves along the rolling direction, passing through the roughing descaling box 2 and the width-fixing press 3 in sequence. After several passes of reciprocating reversible rolling at the roughing mill stand 4, an intermediate slab is formed. The intermediate slab moves rapidly on the intermediate roller table to the flying shear 6 for head cutting. Then, it passes through the finishing descaling box 7 at low speed and then passes through the continuous rolling mill consisting of seven finishing mill stands 8 in sequence to form hot-rolled strip steel. After passing through the post-rolling cooling device 9, the head of the hot-rolled strip steel enters the coiler to begin the coiling operation.
[0060] During the rolling process, the speed regime of the workpiece movement is complex, with various acceleration or deceleration movements, and even reverse movements. To accurately calculate the rolling sequence, this embodiment uses the furnace outlet position as the origin of the rolling production line coordinates, the rolling direction as the positive direction, and the moment when the slab moves from the furnace to the roller table of the rolling production line as time zero. First, the coordinate positions of the head, tail, or any point on the slab along the rolling direction after exiting the furnace are determined, and a time sequence (x) is constructed using the workpiece coordinates and the movement time. j ,t jAdd the initial position and initial time pair (x0, t0) of the workpiece to the time sequence list. Then determine the motion speed regime for the entire production process of the workpiece, and divide the entire motion process into several unidirectional motion processes according to the rolling direction (such as the slab moving from the furnace to the completion of the first pass of rolling on the first roughing mill stand, decelerating to a standstill; the entire process of biting, rolling, and throwing of the workpiece in the second pass of reverse rolling on the first roughing mill stand; the entire process of biting, rolling, moving from the first roughing mill stand to the second roughing mill stand in the third pass of forward rolling on the first roughing mill stand, and the entire process of biting, rolling, and throwing of the workpiece in the first pass of rolling on the second roughing mill stand). The process includes: the entire process of steel biting, rolling, and steel ejection in the second pass of the second roughing mill reverse rolling; the entire process of steel biting, rolling, movement from the second roughing mill stand to the finishing mill entrance, and continuous finishing rolling and coiling in the third pass of the second roughing mill forward rolling; and the calculation of the motion sequence of each unidirectional motion process segment by segment: the currently calculated unidirectional motion process is divided into N speed stages based on the magnitude of acceleration; according to the speed regime, the speed regime parameters of the unidirectional motion process are calculated sequentially, including the starting speed V of each speed stage. i acceleration a i , distance of movement ΔL i and the movement time ΔT i ; Calculate the cumulative distance traveled in one direction before the start of each speed stage. Obtain the time series logarithmic value (x) at the starting point of the unidirectional motion process. last ,t last ); Calculate the motion sequence of the rolled piece during this unidirectional motion process:
[0061] First, determine the total distance traveled during the unidirectional motion process. Using the timing calculation step size ΔS, the number of timing points m required for the unidirectional motion process is calculated, and its value is not less than... The smallest integer;
[0062] Then, for the m time points required for the unidirectional motion process, calculate their motion distances relative to the starting position of the current unidirectional motion process in turn.
[0063] Then, the search is performed on each velocity stage of the unidirectional motion process, when L i <S k ≤L i+1 When the workpiece reaches the k-th time point, it is at the i-th velocity stage of the current unidirectional motion process. The distance the workpiece moves at the k-th time point in this velocity stage is ΔS. k =S k -L i ;
[0064] Then calculate the moving speed of the rolled piece when it moves to the kth timing point:
[0065] Then calculate the motion time of the workpiece relative to the starting point of the current unidirectional motion process when it moves to the kth timing point:
[0066]
[0067] Then, based on the direction of the current unidirectional motion process, the position coordinates of the kth time point are determined as follows:
[0068]
[0069] Then add time pairs (x) to the time pair sequence. k ,t last +Δt k );
[0070] After calculating the m-th timing point, the timing calculation for the next unidirectional motion process is then performed.
[0071] After calculating the timing of the entire movement process of the rolled piece, a timing diagram of the rolling piece movement process is drawn using the rolling piece coordinates and movement time in the timing data pair as the horizontal and vertical axes.
[0072] In this embodiment, to analyze the rationality of the production line equipment layout and optimize the rolling rhythm to improve capacity, given the tapping cycle of adjacent rolled pieces, the initial time is taken as the moment when the first rolled piece begins to move. The timing of the head and tail of two adjacent rolled pieces is calculated sequentially, and the timing diagrams of the head and tail of multiple rolled pieces are drawn as follows. Figure 2 As shown. From Figure 2 The data can reveal the changing patterns of the relative positions between the rolled pieces. Based on whether the curves intersect (if they do, it indicates that adjacent rolled pieces may collide during the steel tapping cycle), the rolling rhythm can be optimized to increase production capacity. Based on the positional relationship between the curves and the main equipment, the rationality of the equipment spacing arrangement on the production line can be checked, and the production line design scheme can be optimized.
[0073] Based on the coordinate positions of the roughing descaling box, finishing descaling box, and roughing mill stand, and using the timing of the heads and tails of adjacent rolled pieces as a basis, the arrival and departure times of each rolled piece from the roughing descaling box, finishing descaling box, and roughing mill stand can be calculated, and a descaling timing diagram can be drawn, such as... Figure 3 As shown, it can be used to verify the rationality of water tank design, etc.
[0074] Based on the coordinate positions of the roughing and finishing mill stands and the motor power values for each rolling pass, and using the timing of the head and tail of adjacent workpieces as a basis, the times when the workpieces arrive at and leave the mill roll gap during the rolling process can be calculated, and a motor power timing diagram (impact load curve) can be plotted. Figure 4 As shown, this provides a useful reference for optimizing motor selection and power distribution design.
[0075] Referring to the calculation method in the above embodiments, the rolling sequence of various rolling production lines can be calculated, providing theoretical guidance for production line optimization design and capacity improvement.
[0076] Example 2:
[0077] Collision analysis of finished steel plates after fixed-length shearing of the master plate in the hot-rolled coil rolling mode. In the production of medium plates on a hot-rolled coil mill production line, the steel coil is uncoiled from the coiling furnace during the final rolling pass. After being rolled by the mill, it forms a master plate. As the master plate moves forward, it is sheared into finished steel plates by shears at the rear of the mill. The slit finished steel plates pass through the laminar flow cooling zone at low speed for cooling treatment. Once the tail of the finished steel plate leaves the laminar flow cooling zone, it accelerates to its maximum running speed to separate from the subsequent steel plates. However, when the head of the finished steel plate reaches the hot straightener, it needs to decelerate to the straightener's threading speed for threading. After the head of the finished steel plate exits the hot straightener, it accelerates to the maximum straightening speed for straightening. After the tail of the finished steel plate exits the hot straightener, the rolled piece accelerates or decelerates to the maximum speed of the hot straightener's exit roller table. After the tail of the finished steel plate enters the cooling bed, its movement speed decelerates to zero. Because the adjustment of the roll gap on the straightener requires a certain amount of time (the roll gap opens after the tail of the finished steel plate leaves the hot straightener, and the head of the subsequent steel plate cannot enter the straightener during the roll gap adjustment period), and the finished steel plate also has a certain operating time after entering the cooling bed (during the cooling bed operation time, the head of the subsequent steel plate cannot enter the cooling bed), in order to rationally design the equipment spacing in the post-rolling area of the hot coil mill and rationally set the speed regime of the coil rolling mode, it is necessary to perform theoretical analysis and calculation of the rolling sequence of coil rolling. The calculation program interface is as follows: Figure 5 As shown.
[0078] In this embodiment, the mill exit position is taken as the coordinate origin, the rolling direction is taken as the positive direction, and the moment when the rolling master plate exits the mill roll gap in the last pass of hot-rolled coil rolling is taken as time zero. A time series pair sequence (x) is constructed using the workpiece coordinates and motion time. j ,t j Add the initial position and initial time pair (x0, t0) of the rolled piece to the time sequence pair list. Then determine the motion speed regime of the rolled piece throughout the entire production process (e.g., Figure 6 As shown in the figure, this embodiment does not have reverse motion, but only a unidirectional motion process (from the mother plate exiting the mill roll gap to the tail of the finished steel plate entering the cooling bed). The unidirectional motion process is divided into N speed stages based on the magnitude of acceleration. According to the speed regime, the speed regime parameters of the unidirectional motion process are calculated sequentially, including the starting speed V of each speed stage. i acceleration a i , distance of movement ΔL i and the movement time ΔT iCalculate the cumulative distance traveled in each unidirectional motion process before the start of each speed stage. Obtain the time series logarithmic value (x) at the starting point of the unidirectional motion process. last ,t last ); Calculate the motion sequence of the rolled piece during this unidirectional motion process:
[0079] First, determine the total distance traveled during the unidirectional motion process. Using the timing calculation step size ΔS, the number of timing points m required for the unidirectional motion process is calculated, and its value is not less than... The smallest integer;
[0080] Then, for the m time points required for the unidirectional motion process, calculate their motion distances relative to the starting position of the current unidirectional motion process in turn.
[0081] Then, the speed stages of the unidirectional motion process are searched, and when L i <S k ≤L i+1 When the workpiece reaches the k-th time point, it is at the i-th velocity stage of the current unidirectional motion process. The distance the workpiece moves at the k-th time point in this velocity stage is ΔS. k =S k -L i ;
[0082] Then calculate the moving speed of the rolled piece when it moves to the kth timing point:
[0083] Then calculate the motion time of the workpiece relative to the starting point of the current unidirectional motion process when it moves to the kth timing point:
[0084]
[0085] Then, based on the direction of the current unidirectional motion process, the position coordinates of the kth time point are determined as follows:
[0086]
[0087] Then add time pairs (x) to the time pair sequence. k ,t last +Δt k );
[0088] After calculating the m-th timing point, since there is only one unidirectional motion process, the timing of the entire motion process of the rolled piece is completed.
[0089] Using this method, the rolling sequence of two adjacent finished steel plates is calculated sequentially, and a time sequence diagram of the rolling process is plotted with the workpiece coordinates and movement time in the time sequence pair as the horizontal and vertical axes, as shown below. Figure 7 As shown. According to Figure 7 The timing curves of the tail end of the preceding steel plate and the head end of the subsequent steel plate can be used to determine whether a collision will occur during the movement after shearing.
[0090] To more clearly understand the spatial and temporal gaps between adjacent finished steel plates during the rolling process, based on the head and tail timing of the rolling sequence of two adjacent finished steel plates, the coordinates of the head of the next rolled piece at the same moment are subtracted from the tail coordinates of the previous rolled piece when it arrives at each timing calculation point. This yields the spatial interval variation pattern between adjacent rolled pieces. The time difference between the tail of the previous rolled piece and the head of the next rolled piece arriving at each timing calculation point is calculated, thus obtaining the time interval variation pattern between adjacent rolled pieces. Based on the calculation results, a time gap curve of adjacent finished steel plates is plotted (e.g., ...). Figure 8 (as shown) and spatial gap curve (as shown) Figure 9 (as shown), so as to judge the rationality of the process based on the constraints of spatial and temporal gaps.
[0091] To optimize the equipment layout, speed regime, and length in the post-rolling zone of hot-rolled coils, the rolling sequence of adjacent finished steel plates under different lengths and rolling speeds can be calculated using the aforementioned rolling sequence calculation method. The minimum spatial clearance, the spatial clearance at the moment the previous steel plate exits the hot straightener, and the spatial clearance at the moment the previous steel plate completes the cooling bed operation can be solved under different lengths and rolling speeds. Curves are then plotted as follows: Figure 10 , Figure 11 , Figure 12 As shown. Based on the spatial clearance constraints, from... Figure 10 , Figure 11 , Figure 12 The system can assess the rationality of the process and optimize the production process.
[0092] The method described in this embodiment can also be used in other similar scenarios, providing theoretical guidance for optimizing production line layout and production process schemes.
[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.
Claims
1. A method for calculating rolling timing, characterized in that, The method specifically includes the following steps: S1: Construct a time series of pairs based on the workpiece coordinates and motion times. Pair the initial position and initial time of the rolled piece. Add to the time series pair sequence list; S2: Determine the speed system of the workpiece movement, and decompose the entire workpiece movement process into several unidirectional movement processes according to whether the workpiece moves along or against the rolling direction; S3: Divide each unidirectional motion process into different velocity stages based on the magnitude of acceleration, and calculate the starting velocity, acceleration, distance traveled, and time traveled for each velocity stage in turn. Calculate the motion sequence of each unidirectional motion process segment by segment. S4: After calculating the timing of the entire motion process of the rolled piece, use the rolled piece coordinates and motion time in the timing pair as the horizontal and vertical axes to draw the timing diagram of the rolled piece motion process. In step S3, the motion timing of each unidirectional motion process is calculated segment by segment, specifically including the following steps: S31: For a certain unidirectional motion process, divide it into velocity stages and count the number of velocity stages. N ; S32: Calculate the velocity-time parameters for the unidirectional motion process sequentially, including the initial velocity of each velocity phase. acceleration Distance of movement and movement time , ; S33: Calculate the cumulative distance traveled in one direction before the start of each speed stage: ; S34: Obtain the timing data at the starting point of the unidirectional motion process. In this context, the starting point of a unidirectional motion process refers to the initial position of the workpiece or the end point of the previous unidirectional motion process. This represents the coordinate position of the workpiece at the starting point of the current unidirectional motion process. This refers to the moment when the workpiece is at the starting point of the current unidirectional motion process; S35: Calculate the timing of the workpiece movement during the rolling process, specifically including: S351: Determine the total distance traveled in a unidirectional motion process Timing calculation step size Calculate the number of time points required for the unidirectional motion process. m , m The value is not less than The smallest integer; S352: Calculations required for a unidirectional motion process m For each time point, calculate the distance of its movement relative to the starting position of the current unidirectional motion process: ; S353: Search for each velocity stage of the unidirectional motion process, when At that time, it means the workpiece has moved to the first... k At the current time point, the first time in the unidirectional motion process is... i The workpiece moves to the [speed stage], [time stage]... k At the nth time point i The distance traveled in each speed phase is ; S354: Calculate the movement of the rolled piece to the... k Movement speed at each time point: ; S355: Calculate the movement of the rolled piece to the... k The motion time of each time point relative to the starting point of the current unidirectional motion process: ; S356: Determine the first [unit / stage] based on the direction of the current unidirectional motion process. k The coordinates of each time series point are: ； S357: Add time series pairs to the time series pair sequence list ; S358: After calculating the first... m After each timing point, return to step S31 to perform timing calculations for the next unidirectional motion process; In step S4, when calculating the movement sequence of the rolled pieces during the rolling process, based on the calculated or given rolling cycle of adjacent rolled pieces, the initial time is taken as the time when the first rolled piece begins to move. The head and tail sequence of each rolled piece are calculated sequentially, and the head and tail sequence diagrams of multiple rolled pieces are drawn to obtain the change law of the relative positional relationship between the rolled pieces. Given the coordinates of the critical equipment, the arrival and departure times of each piece of rolling mill are calculated based on the head and tail timing of adjacent pieces, enabling the creation of a production operation sequence diagram for the critical equipment.
2. The rolling timing calculation method according to claim 1, characterized in that, In step S1, the initial position of the rolled piece includes: the coordinates of the head, tail, middle or any other point on the rolled piece, so as to calculate the timing of the head, tail, middle or any other point on the rolled piece, and draw a timing diagram of one or more points on the rolled piece.
3. The rolling timing calculation method according to claim 1, characterized in that, In step S31, when dividing the velocity phases, the entire motion process is divided according to the magnitude of acceleration. A segment of motion with the same acceleration is divided into a velocity phase, and the acceleration values of two adjacent velocity phases are different.
4. The rolling timing calculation method according to claim 1, characterized in that, In step S32, the starting speed of the first speed stage must be given, and the starting speeds of subsequent speed stages are as follows: .
5. The rolling timing calculation method according to claim 1, characterized in that, In step S4, the change law of the relative positional relationship between the rolled pieces is obtained, specifically including: based on the head and tail time sequence of multiple rolled pieces, the head coordinate of the next rolled piece at the same time is subtracted from the tail coordinate of the previous rolled piece when it arrives at each time sequence calculation point, that is, the change law of the spatial interval between adjacent rolled pieces is obtained, or the time difference between the tail of the previous rolled piece and the head of the next rolled piece arriving at each time sequence calculation point is calculated, that is, the change law of the time interval between adjacent rolled pieces is obtained.