Stable rolling production system for ultra-thin strips of special alloys
Through cross-domain traceability system and other detection and control systems, the problems of excessive length and low material yield of special alloy extremely thin strips are solved during the rolling process, and more stable rolling production is achieved, reducing material waste and strip breakage are risk.
Patent Information
- Application Number
- CN202310729118.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-06-19
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2043-06-19
AI Technical Summary
Special alloy extremely thin strips have problems such as excessive length and low material yield in rolling production, resulting in waste of materials and unstable production. This is mainly due to the differences in material characteristics and the difficulty of processing, resulting in scarce process data and frequent strip breakage.
The cross-domain traceability system, rolling mill control system, edge thickness measurement system and belt breakage warning system are adopted to calculate and detect the characteristic data of the strip, and close-loop control is realized, reducing the length of the head and tail over-distance segment and the possibility of the occurrence of the belt breakage.
It effectively reduces the length of the head and tail of the extremely thin strip of special alloy, improves the yield rate, reduces material waste, and ensures the stable rolling of the strip through precise inspection and control, improving the stability of the production system.
Smart Images
Figure CN116809636B_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the field of plate and strip rolling, and in particular relates to a stable rolling production system for special alloy ultra-thin strips. Background Art
[0002] Strips are widely used in defense, military industry, home appliances, microelectronics and other fields. Especially with the promotion of high-tech electronic products such as curved screens, end users of products require strips to have extremely thin thickness, extremely high strength, excellent plate shape and high conductivity. Therefore, the domestic demand for this kind of special alloy ultra-thin strip is huge, but most of the products currently rely on imports.
[0003] The main reason for this dilemma is that the material properties of special alloys vary greatly, and high hardness, difficulty in deformation and poor ductility are the main characteristics of this type of alloy. In addition, since the requirements for production technology far exceed those of conventional metal materials, the preparation of ultra-thin strips of special alloys is very difficult and there are the following serious problems in actual rolling production:
[0004] (1) Excessive length
[0005] The scarcity of raw materials has resulted in a lack of process data for ultra-thin strips of special alloys. Therefore, production units mostly rely on empirical data and on-site exploration to adjust the thickness and shape of the strips, which causes the strip coils to be scrapped due to excessive head and tail precision. Excessive head and tail tolerances cause waste of expensive materials and seriously affect the stable production of the unit operation line.
[0006] (2) Low yield rate
[0007] Due to poor ductility, extremely high strength and obvious work hardening, special alloy strips often break during the rolling process. This phenomenon greatly reduces the product yield rate, especially in the final production, which will cause huge economic losses. Summary of the invention
[0008] The purpose of the present invention is to provide a stable rolling production system for ultra-thin strips of special alloys to overcome the above-mentioned technical defects.
[0009] In order to solve the above technical problems, the present invention provides a stable rolling production system for special alloy ultra-thin strips, which at least comprises:
[0010] Cross-domain traceability system, used to calculate the rolling process data of the target strip to be rolled;
[0011] The rolling mill control system controls the rolling of the target strip to be rolled according to the rolling process data calculated by the cross-domain traceability system. The rolling process of the target strip to be rolled is divided into a non-steady-state acceleration rolling stage, a steady-state rolling stage, and a non-steady-state deceleration rolling stage.
[0012] The stable rolling production system for ultra-thin strips of special alloys also includes:
[0013] The edge inspection and thickness measurement system is used to detect the thickness of the target strip to be rolled;
[0014] The rolling mill press-down system controls the roll gap according to the strip thickness detected by the edge-probing and thickness-measuring system;
[0015] Strip break warning system, used to detect and determine whether the target strip to be rolled has strip edge cracks;
[0016] If the strip break warning system determines that edge cracks occur in the target strip to be rolled, the rolling mill control system controls the rolling mill to stop.
[0017] The cross-domain traceability system includes:
[0018] A memory storing a feature library of historical first-pass metastable data;
[0019] The retrieval module obtains the characteristics of the target strip to be rolled, retrieves the historical first-pass sub-steady-state data that meets the characteristics of the target strip to be rolled from the historical first-pass sub-steady-state data characteristic library, and sends it to the microprocessor;
[0020] The microprocessor receives the data sent by the calling module, calculates the first-pass rolling process data of the target strip to be rolled, and calculates the next-pass rolling process data of the target strip to be rolled according to the previous-pass rolling process data of the target strip to be rolled.
[0021] The historical first-pass steady-state data feature library is constructed based on the first-pass rolling process data of all historical rolling processes, where the first-pass steady-state data include: strip width, entrance thickness, exit thickness, entrance tension, exit tension, steady-state rolling speed, strip elongation, and n represents the rolling process number, which is a positive integer.
[0022] The characteristic of the target strip to be rolled is the entrance thickness of the first-pass strip. Retrieving the historical first-pass steady-state data that meets the characteristics of the target strip to be rolled in the historical first-pass steady-state data feature library means searching for the entrance thickness in the historical first-pass steady-state data feature library to ensure that the entrance thickness is the value closest to the entrance thickness of the target strip to be rolled, and retrieving the strip width, exit thickness, entrance tension, exit tension, steady-state rolling speed, and strip elongation corresponding to the entrance thickness.
[0023] The belt break warning system includes:
[0024] A laser transmitter is installed above the edge of the target strip to be rolled;
[0025] A laser receiver is installed below the edge of the target strip to be rolled;
[0026] If the laser emitted by the laser transmitter is detected by the laser receiver, it is determined that there is a risk of belt breakage. The laser receiver sends a pre-belt breakage warning signal to the rolling mill control system, and the rolling mill control system controls the rolling mill to stop.
[0027] During the rolling process, the edge patrol and thickness measuring system located above the target strip to be rolled moves back and forth along the width direction of the strip to detect the edge thickness and middle thickness of the strip. The edge patrol and thickness measuring system sends the strip thickness data to the rolling mill pressing system. After receiving the strip thickness data, the rolling mill pressing system controls the action of the pressing cylinder to make the middle thickness of the target strip to be rolled 1.01 times the edge thickness of the strip.
[0028] The beneficial effects of the present invention are as follows:
[0029] (1) A historical first-pass steady-state data feature library is established in advance. According to the specifications of the target strip to be rolled, the specification data that meets the requirements is retrieved from the historical first-pass steady-state data feature library. Then, the first-pass rolling process data of the target strip to be rolled is calculated. Moreover, the rolling process data of the previous pass is used as the given basis for the rolling process data of the next pass, which greatly reduces the length of the out-of-tolerance section at the head and tail of the strip.
[0030] (2) A thickness measurement system that moves back and forth along the width of the strip is installed above the target strip to be rolled. The system detects the thickness fluctuation of the strip and sends it to the rolling mill press system, so that the two form a closed-loop control to ensure that the thickness of the strip edge is always less than the thickness of the middle part, thereby ensuring that the middle part of the strip can withstand greater tensile stress and ensuring the stable rolling of special alloy ultra-thin strips.
[0031] (3) Laser transmitters and laser receivers are arranged along the upper and lower sides of the target strip to be rolled. Whether the laser spot emitted by the laser transmitter is detected by the laser receiver is used as the signal condition for the strip break warning. If the signal is sent, the machine will stop immediately. That is, by accurately detecting the cracks on the edge of the strip, the possibility of strip breakage is greatly reduced.
[0032] In order to make the above contents of the present invention more clearly understood, preferred embodiments are given below and described in detail in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0033] Figure 1 It is a structural diagram of a stable rolling production system for ultra-thin strips of special alloys.
[0034] Figure 2 It is the basic principle diagram of the cross-domain traceability system;
[0035] Figure 3 This is the basic principle diagram of the edge patrol and thickness measurement system;
[0036] Figure 4 It is the detection principle diagram of the belt break warning system.
[0037] Figure 5 It is the control principle diagram of the stable rolling production system of special alloy ultra-thin strips.
[0038] Description of reference numerals:
[0039] 1. Laser transmitter; 2. Laser receiver. DETAILED DESCRIPTION
[0040] The following describes the implementation of the present invention through specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.
[0041] It should be noted that, in the present invention, the top, bottom, left and right in the figure are regarded as the top, bottom, left and right of the stable rolling production system for special alloy ultra-thin strip described in this specification.
[0042] The exemplary embodiments of the present invention are now described with reference to the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the accompanying drawings are not intended to limit the present invention. In the accompanying drawings, the same units / elements are marked with the same reference numerals.
[0043] Unless otherwise specified, the terms (including technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is understood that the terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.
[0044] The present embodiment relates to a stable rolling production system for ultra-thin strips of special alloys. The special alloy is an iron-carbon alloy formed by adding an appropriate amount of one or more alloying elements to ordinary carbon steel. The ultra-thin strip refers to a metal plate strip with a thickness of less than 0.02-0.03mm, and those with a thickness of less than 0.05mm are usually called ultra-thin strips.
[0045] Before starting the rolling process provided by this embodiment, the conventional process for producing ultra-thin strips relies more on the experience and operation level of the operator. When the product or operator is changed, the process needs to be re-explored, which is time-consuming and material-consuming. After adopting the rolling process provided by this embodiment, the process data in this embodiment can be collected, added to the database, and updated to ensure the accuracy of the process data in the database.
[0046] It should be noted that the strip to be rolled will be referred to as the target strip to be rolled hereinafter.
[0047] Stable rolling production system for ultra-thin strip of special alloys, see Figure 1 , including at least:
[0048] Cross-domain traceability system, used to calculate the rolling process data of the target strip to be rolled;
[0049] The rolling mill control system controls the rolling of the target strip to be rolled according to the rolling process data calculated by the cross-domain traceability system. The rolling process of the target strip to be rolled is divided into a non-steady-state acceleration rolling stage, a steady-state rolling stage, and a non-steady-state deceleration rolling stage.
[0050] In the same pass, the tension setting values of the non-steady-state acceleration rolling stage, the steady-state rolling stage, and the non-steady-state deceleration rolling stage do not change, but the speed and acceleration of the three stages are different. Therefore, the rolling process data calculated below mainly refers to the speed and acceleration.
[0051] The rolling mill control system is the control system of the rolling mill itself, which is mainly used to control the rolling process of the rolling mill and will not be elaborated here.
[0052] The cross-domain traceability system automatically retrieves the first-pass process data of the strip with similar or identical specifications to the raw materials, completes the calculation and issues the rolling of the first non-steady-state acceleration stage of this rolling process, and uses the relevant data of the non-steady-state acceleration stage as the process data setting standard for the non-steady-state deceleration stage.
[0053] See also Figure 2 , the cross-domain traceability system includes:
[0054] (1) A memory, storing a historical first-pass steady-state data feature library, which is constructed based on the first-pass rolling process data of all historical rolling processes, wherein the first-pass steady-state data includes: strip width B 历史首n , entrance thickness H 历史首n , outlet thickness h 历史首n , inlet tension T 历史首n , outlet tension t 历史首n , Steady rolling speed V 历史首n , Strip elongation δ 历史首n , n represents the rolling process number, which is a positive integer, and n is 1, 2, 3, 4...
[0055] (2) A retrieval module is used to obtain the characteristics of the target strip to be rolled, retrieve the historical first-pass sub-steady-state data that meets the characteristics of the target strip to be rolled from the historical first-pass sub-steady-state data feature library, and send it to the microprocessor.
[0056] The characteristic of the target strip to be rolled is the entrance thickness of the first pass strip. Retrieving the historical first pass steady-state data that meets the characteristics of the target strip to be rolled in the historical first pass steady-state data characteristic library means searching for H in the historical first pass steady-state data characteristic library.历史首n , ensure H 历史首n is the closest to the target strip entrance thickness H to be rolled 目标首n For example, the target strip to be rolled is 0.049mm, and the values in the data feature library are 0.051mm, 0.050mm, 0.048mm, 0.047mm, etc., then you can choose 0.048mm H 历史首n As the closest H 目标首n The numerical value of .
[0057] The reason why we choose 0.048mm H 历史首n As the closest H 目标首n The value of 0.050mm was not selected because the thinner the strip thickness, the more difficult it is to roll, so the reference significance of thin strips is greater.
[0058] After confirming the closest value, retrieve H in the data feature library 历史首n Corresponding strip width B 历史首n , outlet thickness h 历史首n , inlet tension T 历史首n , outlet tension t 历史首n , Steady rolling speed V 历史首n , Strip elongation δ 历史首n .
[0059] (3) The microprocessor receives the data sent by the call module and performs the following two types of calculations. Figure 2 .
[0060] Perform the first type of calculation
[0061] Calculate (weighted given) the first-pass rolling process data of the target strip to be rolled, including:
[0062] T 目标首n =T 历史首n B 目标首n H 目标首n / B 历史首n H 历史首n
[0063] t 目标首n =h 目标首n / H 目标首n T 目标首n
[0064] V 目标首n =V 历史首n h 历史首n / h 目标首n
[0065] a 目标首n =0.5H 目标首n δ 目标首n / H 历史首n δ历史首n
[0066] In the formula, B 目标首n is the strip width of the target strip to be rolled, H 目标首n is the thickness of the target strip to be rolled at the mill entrance in the first pass, h 目标首n is the thickness of the target strip to be rolled at the mill exit in the first pass, δ 目标首n is the strip elongation of the target strip to be rolled, both of which are known values;
[0067] Where, T 目标首n Indicates the first pass mill entrance tension of the target strip to be rolled, t 目标首n Indicates the first pass mill exit tension of the target strip to be rolled, V 目标首n It represents the rolling speed of the target strip to be rolled in the first sub-steady-state rolling stage, a 目标首n It represents the rolling acceleration of the target strip to be rolled in the first non-steady acceleration stage. The rolling acceleration of the target strip to be rolled in the first non-steady deceleration stage is -a 目标首n .
[0068] In the first pass, no matter at which stage of the rolling process, the mill entrance tension T 目标首n is constant, similarly, the mill exit tension t 目标首n It is also unchanging.
[0069] Perform the second type of calculation
[0070] According to the rolling process data of the previous pass of the target strip to be rolled, the rolling process data of the next pass of the target strip to be rolled is calculated one by one, specifically including:
[0071] T 目标i =t 目标(i-1)
[0072] t 目标i =T 目标i h 目标i / H 目标i
[0073] V 目标i =V 目标(i-1) h 目标(i-1) / h 目标i
[0074] a 目标i =-a 目标(i-1) h 目标i / h 目标(i-1)
[0075] Wherein, i represents the pass number of the current rolling process, i = 2, 3, 4, 5...;
[0076] In the formula, h 目标iis the thickness of the target strip to be rolled at the mill exit at the i-th pass, H 目标首n is the thickness of the target strip to be rolled at the mill entrance of the i-th pass, h 目标(i-1) is the thickness of the target strip to be rolled at the mill exit at the i-1th pass, both of which are known values;
[0077] Where, t 目标(i-1) V represents the exit tension of the target strip to be rolled at the i-1th pass of the rolling mill, 目标(i-1) represents the rolling speed of the target strip to be rolled in the i-1th pass steady-state rolling stage, -a 目标(i-1) represents the rolling acceleration of the target strip to be rolled during the non-steady-state deceleration stage of the i-1th pass;
[0078] Where, T 目标i It represents the tension of the target strip to be rolled at the mill entrance of the i-th pass, t 目标i V represents the exit tension of the target strip to be rolled at the i-th pass of the rolling mill, 目标i represents the rolling speed of the target strip to be rolled in the steady-state rolling stage of the i-th pass, a 目标i represents the rolling acceleration of the target strip to be rolled in the non-steady acceleration stage of the i-th pass, and the rolling acceleration of the target strip to be rolled in the non-steady deceleration stage of the i-th pass is -a 目标i .
[0079] From the above formula, we can know that the process data of the previous pass at the exit side (rolling mill exit tension t 目标(i-1) , rolling mill outlet thickness h 目标(i-1) , acceleration-a 目标(i-1) ) as the next pass entrance side process data (rolling mill entrance tension T 目标i , rolling mill outlet tension t 目标i , acceleration a 目标i ), or in other words, the process data on the outlet side of this pass is used as the given standard for the process data on the inlet side of the next pass, with the aim of reducing the length of the head and tail out-of-tolerance sections.
[0080] like Figure 2 As shown in the figure, the acceleration in the non-steady-state accelerated rolling stage and the acceleration in the non-steady-state decelerated rolling stage are opposite to each other. Specifically, in the non-steady-state accelerated rolling stage, the rolling speed increases from 0 to an acceleration of a. 目标i Accelerate, and when the target speed V is reached 目标i When the rolling mill is in the steady state, the strip diameter D at the exit of the rolling mill is recorded. 出 =d; as the steady-state rolling process proceeds, D 出 Gradually increasing, D 入 Gradually decreases, when D 入 When the rolling speed decreases to d, the rolling process transitions from the steady-state rolling stage to the unsteady-state deceleration rolling stage and 目标idecelerate to stop. That is, from 0 to acceleration a 目标i Accelerate to V 目标i and by V 目标i With deceleration -a 目标i The length of the strip passing through the deceleration to 0 is the same, so the change in the roll diameter caused is also the same, and this is based on the premise that the strip diameter of the inlet roll when the vehicle is stopped is the same as the strip diameter of the outlet side roll when the vehicle is started.
[0081] In summary, see Figure 2 , it is necessary to first establish a historical first-pass steady-state data feature library, and then calculate the first-pass rolling process data of the target strip to be rolled based on the historical first-pass steady-state data feature library, that is, "Is it the first pass, yes", and then calculate the non-first-pass rolling process data of the target strip to be rolled, that is, "Is it the first pass, no, i=2", at this time, the rolling speed in the steady-state rolling stage and the rolling acceleration in the unsteady-state rolling stage have been obtained, and the rolling in the unsteady-state acceleration stage begins. In the unsteady-state acceleration rolling stage, the rolling speed increases from 0 to an acceleration a i Accelerate, and when the target speed V is reached 目标i When the rolling mill is in the steady state, the strip diameter D at the exit of the rolling mill is recorded. 出 =d; as the steady-state rolling process proceeds, D 出 Gradually increasing, D 入 Gradually decreases, when D 入 When it decreases to d, that is Figure 2 If the value is "yes", the rolling process will transition from the steady-state rolling stage to the unsteady-state deceleration rolling stage and the rolling speed will be -a i Slow down to stop, the current rolling is completed, if D 入 The value of is not d, that is Figure 2 If the answer is “No”, then continue with steady-state rolling.
[0082] because Figure 2 The figure shows multi-pass rolling, and the rolling process data of the previous pass is used as the given reference for the rolling process data of the next pass. Figure 2 The process forms a closed loop.
[0083] The stable rolling production system for ultra-thin strips of special alloys also includes:
[0084] The edge inspection and thickness measurement system is used to detect the thickness of the target strip to be rolled;
[0085] The rolling mill press-down system controls the roll gap according to the strip thickness detected by the edge-probing and thickness-measuring system;
[0086] Strip break warning system, used to detect and determine whether the target strip to be rolled has strip edge cracks;
[0087] If the strip break warning system determines that edge cracks occur in the target strip to be rolled, the rolling mill control system controls the rolling mill to stop.
[0088] During the rolling process, the strip is free in the width direction and has the least resistance. Therefore, after repeated rolling, edge cracks are very likely to occur, which in turn causes the tensile stress of the strip to suddenly increase and lead to strip breakage.
[0089] In order to prevent the occurrence of serious accidents such as strip breakage, a laser transmitter 1 is installed above the edge of the target strip to be rolled, and a laser receiver 2 is installed below the edge of the target strip to be rolled. The laser transmitter 1 and the laser receiver 2 are arranged vertically opposite to each other, and the target strip to be rolled passes between them.
[0090] The detection range of the laser transmitter 1 and the laser receiver 2 is the distance between the driving side of the strip and the center line of the unit, which is 0.475-0.5 times the strip width. This is because the strip in this area is prone to edge cracks due to the lateral flow of metal.
[0091] Reference Figure 4 If the laser emitted by the laser transmitter 1 is detected by the laser receiver 2, it is determined that there is a risk of belt breaking. The laser receiver 2 sends a warning signal before belt breaking to the rolling mill control system, and the rolling mill control system controls the rolling mill to stop, as follows:
[0092] When the strip cracks at the edge, the laser emitted by the laser transmitter 1 can pass through the crack area and be received by the laser receiver 2. Therefore, when the laser receiver 2 detects the laser, it is judged as a warning signal before the strip breaks and sends a signal immediately. At this time, the unit speed will stop urgently, and the corresponding acceleration is -1.5m / s 2 .
[0093] The cross-domain traceability system automatically retrieves the first pass process data of the strip with similar or same specifications as the raw material, completes the calculation and sends it, and uses the current pass rolling process data as the given standard for the next pass rolling process data. During the rolling process of any pass, please refer to Figure 5 The strip break warning system will detect and determine whether the strip to be rolled has strip edge cracks. If strip edge cracks occur, the strip break warning system will send a signal ( Figure 5 If the strip edge crack does not occur, the strip break warning system will not send a signal. Figure 5 In the answer box, select “No”), the cross-domain traceability system continues to execute rolling.
[0094] In order to reduce the control difficulty of the plate shape system and improve the thickness difference accuracy of the final product, the present embodiment also installs an edge patrol and thickness measurement system above the target strip to be rolled. Specifically, during the rolling process, the edge patrol and thickness measurement system located above the target strip to be rolled reciprocates along the width direction of the strip to detect the edge thickness and middle thickness of the strip. The edge patrol and thickness measurement system sends the strip thickness data to the rolling mill press-down system. After receiving the strip thickness data, the rolling mill press-down system controls the action of the press-down cylinder so that the middle thickness of the target strip to be rolled is 1.01 times the edge thickness of the strip, that is, the edge patrol and thickness measurement system and the press-down cylinder form a closed-loop control.
[0095] The rolling mill's screw-down system is a conventional device of the rolling mill. The main actuator is the screw-down cylinder that controls the roll gap. The thickness of the strip is basically the same as the roll gap.
[0096] The edge-patrol thickness measuring system and the depression cylinder form a closed-loop control, which means that when the edge-patrol thickness measuring system detects thickness fluctuations in the strip, the thickness of the strip is changed by lifting or pressing down the depression cylinder, and the cross-sectional convexity of the strip can be changed by controlling the amount by which the depression cylinder is extended or retracted.
[0097] like Figure 3 As shown, the edge thickness measurement system is a thickness gauge that can move linearly. The range of movement is between the strip transmission side and the center line of the unit. The width of this range is 0-0.5 times the bandwidth. In addition, the movement frequency F of the edge thickness measurement system is positively correlated with the strip linear speed V and the strip thickness h as follows:
[0098] F=V / h
[0099] As for the linear movement mode of the thickness gauge, it can be electric push rod type, hydraulic cylinder telescopic type, etc., without limitation.
[0100] The closed-loop control of the edge thickness measurement system and the rolling mill press system can ensure that the thickness of the middle part of the strip is approximately 1.01 times the thickness of its edge. Therefore, the middle part of the strip can withstand greater tensile stress. Moreover, the edge of the strip will be cut to length in the subsequent finishing process, so the thickness difference will not affect the thickness accuracy of the product.
[0101] Reference Figure 5 The belt break warning system and the edge patrol thickness measurement system are put into use in each pass, and the belt break warning system has the highest priority. Once a possible belt break is detected, any pass will be stopped urgently. At the same time, the cross-domain traceability system and the edge patrol thickness measurement system will no longer work.
[0102] The stable rolling production system of special alloy ultra-thin strip provided by the present invention has the following working process:
[0103] The cross-domain traceability system obtains the first-pass sub-steady-state data of all historical rolling processes and builds a feature database of the historical first-pass sub-steady-state data;
[0104] According to the characteristics of the target strip to be rolled, the cross-domain traceability system automatically retrieves the historical first-pass steady-state data of the strip with similar or identical characteristics to the target strip to be rolled in the historical first-pass steady-state data feature library, calculates and issues the first-pass rolling process data of the target strip to be rolled, starts the rolling mill, and the rolling mill rolls the target strip to be rolled according to the first-pass rolling process data;
[0105] Unsteady-state acceleration and transition to steady-state rolling, and record the coil diameter at the exit side at this time;
[0106] Steady-state rolling;
[0107] The edge thickness measurement system and the rolling mill pressure system form a closed-loop control of the thickness of the target strip to be rolled and make the center thickness (H 中 ) is always the edge thickness (H 边 ) times, see Figure 5 , H 中 =1.01H 边 ;
[0108] The laser transmitter 1 continuously emits laser light, and the laser receiver 2 immediately sends a signal when it detects the laser light;
[0109] If the laser receiver 2 sends a signal, the rolling mill automatically stops and ends the rolling of this pass;
[0110] If the laser receiver 2 does not send a signal, the system continues to roll in a steady state and the coil diameter of the strip on the inlet side is equal to the coil diameter of the strip on the outlet side, and then enters a non-steady-state deceleration stage until it stops;
[0111] Start the next rolling process;
[0112] According to the rolling process data of the previous pass of the target strip to be rolled, the rolling process data of the next pass of the target strip to be rolled is calculated, and the rolling mill starts non-first pass rolling of the target strip to be rolled according to the rolling process data of the next pass until the finished product specifications are reached.
[0113] The present invention automatically retrieves the empirical data of the first pass of the rolled process according to the specifications of the raw material to be rolled, and calculates, issues and completes the rolling of the first non-steady-state acceleration stage of the current rolling process, and uses the relevant data of the non-steady-state acceleration stage as the process data setting standard for the non-steady-state deceleration stage; and the present invention uses the process data on the outlet side of the current pass as the given standard for the process data on the inlet side of the next pass, which greatly reduces the length of the head and tail out-of-tolerance sections.
[0114] The edge thickness measurement system and the pressing actuator form a closed-loop control so that the edge thickness of the strip in the steady and non-steady stages is less than the middle thickness, and whether the laser spot of the strip break warning system is detected by the corresponding receiving device is used as the signaling condition of the strip break warning. If the signal is sent, the machine will stop urgently. The present invention greatly reduces the possibility of strip breakage and reduces the length of the head and tail out-of-tolerance sections, which not only reduces the waste of expensive special alloy raw materials but also realizes the stable rolling of ultra-thin strips.
[0115] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.
Claims
1. A stable rolling production system for ultra-thin strips of special alloys, characterized in that: At least: Cross-domain traceability system, used to calculate the rolling process data of the target strip to be rolled; A rolling mill control system controls the rolling of the target strip to be rolled according to the rolling process data calculated by the cross-domain traceability system, wherein the rolling process of the target strip to be rolled is divided into a non-steady-state acceleration rolling stage, a steady-state rolling stage, and a non-steady-state deceleration rolling stage; The stable rolling production system for ultra-thin strips of special alloys also includes: A thickness measuring system for detecting the thickness of the target strip to be rolled; A rolling mill press-down system controls the roll gap according to the strip thickness detected by the edge-probing and thickness-measuring system; A strip break warning system is used to detect and determine whether the target strip to be rolled has strip edge cracks; If the strip break warning system determines that the target strip to be rolled has edge cracks, the rolling mill control system controls the rolling mill to stop; The cross-domain traceability system includes: A memory storing a feature library of historical first-pass metastable data; A calling module is used to obtain the characteristics of the target strip to be rolled, and to call the historical first-pass sub-steady-state data that meets the characteristics of the target strip to be rolled in the historical first-pass sub-steady-state data characteristic library, and send the data to the microprocessor; The microprocessor receives the data sent by the retrieval module, calculates the first-pass rolling process data of the target strip to be rolled, and calculates the next-pass rolling process data of the target strip to be rolled according to the previous-pass rolling process data of the target strip to be rolled.
2. The stable rolling production system of special alloy ultra-thin strip according to claim 1, characterized in that: The historical first-pass steady-state data feature library is constructed based on the first-pass rolling process data of all historical rolling processes, wherein the first-pass steady-state data includes: strip width, entrance thickness, exit thickness, entrance tension, exit tension, steady-state rolling speed, and strip elongation.
3. The stable rolling production system of special alloy ultra-thin strip according to claim 1, characterized in that: The characteristic of the target strip to be rolled is the entrance thickness of the first-pass strip. Retrieving the historical first-pass steady-state data that meets the characteristics of the target strip to be rolled from the historical first-pass steady-state data feature library means searching for the entrance thickness in the historical first-pass steady-state data feature library to ensure that the entrance thickness is the value closest to the entrance thickness of the target strip to be rolled, and retrieving the strip width, exit thickness, entrance tension, exit tension, steady-state rolling speed, and strip elongation corresponding to the entrance thickness.
4. The stable rolling production system of special alloy ultra-thin strip according to claim 1, characterized in that: The belt break warning system comprises: A laser transmitter is installed above the edge of the target strip to be rolled; A laser receiver is installed below the edge of the target strip to be rolled; If the laser emitted by the laser transmitter is detected by the laser receiver, it is determined that there is a risk of belt breakage, and the laser receiver sends a pre-belt breakage warning signal to the rolling mill control system, and the rolling mill control system controls the rolling mill to stop.
5. The stable rolling production system of special alloy ultra-thin strip according to claim 1, characterized in that: During the rolling process, the edge patrol and thickness measuring system located above the target strip to be rolled moves back and forth in the strip width direction to detect the edge thickness and middle thickness of the strip. The edge patrol and thickness measuring system sends the strip thickness data to the rolling mill pressing system. After receiving the strip thickness data, the rolling mill pressing system controls the action of the pressing cylinder to make the middle thickness of the target strip to be rolled 1.01 times the edge thickness of the strip.