A method and system for adjusting tail load of finishing strip
By obtaining the bending force and balance force of the target frame of the finish-rolled tail in hot continuous rolling production, and automatically adjusting the bending force of the strip tail, the problem of unstable control of the thin-spec strip tail plate is solved, and stable rolling and efficient production of the strip tail is achieved.
Patent Information
- Application Number
- CN202211603786.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-12-13
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2042-12-13
AI Technical Summary
During the existing hot continuous rolling production process, thin-spec strip steel tails are prone to instability when rolling steel at the tail, resulting in quality defects such as tail deviation, intermediate wave rolling, tail rolling and breaking, and the lack of automatic adjustment control means, and relying on manual adjustment, resulting in high labor intensity, timeliness and accuracy difficult to ensure.
A method of adjusting the load of the fine-rolled strip tail is proposed. By obtaining the current bending force and the frame balance force of the target frame of the finishing tail, comparing and calculating the drop value of the one-side bending rolling rolling force, the bending force of the strip tail is automatically adjusted. At the same time, by automatically lifting the roller seam and the floating sleeve to fall into the small sleeve in advance, stable rolling and control of the strip tail is achieved.
Effectively reduce defects such as rolling and breaking in the middle of the strip tail, tail-shed rolling and breaking, ensure the control of the plate quality, improve the rolling stability and material yield, reduce the labor intensity of the operator, and avoid repeated manual operation adjustments.
Smart Images
Figure CN115945527B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of intelligent steel production applications, and in particular to a method and system for adjusting the tail load of a finishing strip. Background Art
[0002] During the hot rolling production process, the plate shape control is unstable when the thin-gauge tail is finished and rolled, which leads to tail deviation, middle wave rolling and breaking, tail swinging and rolling and other strip tail quality defects. When the strip tail swinging and breaking and rolling and other defects occur, it is necessary to check whether there are roller marks on the surface of the working roll in time. If roller marks appear, they need to be replaced in time, which affects the smooth production. At the same time, the part with quality defects at the tail of the strip needs to be removed by the leveling unit, which affects the product yield. At present, the hot coil production line has no automatic adjustment control means for defects such as tail deviation, middle wave rolling and breaking, tail swinging and rolling and breaking. The operator can only manually adjust the roll gap on both sides to reduce tail swinging and breaking and rolling accidents. The timeliness and accuracy of manual adjustment cannot be effectively guaranteed, and the operator must make manual adjustments for each strip, which is labor-intensive and seriously affects the stable and smooth production and the improvement of product quality. Summary of the invention
[0003] In view of the above problems existing in the prior art, the present invention proposes a method and system for adjusting the load of the tail of the finishing strip, which mainly solves the problem that the existing quality control of the tail plate shape of the strip depends entirely on manual control, the labor intensity is high, and the timeliness and accuracy of manual adjustment cannot be effectively guaranteed.
[0004] In order to achieve the above purpose and other purposes, the technical solution adopted by the present invention is as follows.
[0005] The present application provides a method for adjusting the tail load of a finishing strip, comprising:
[0006] Obtain the current bending roll force and stand balance force of the target stand at the tail end of finishing rolling;
[0007] When the previous rack of the target rack throws steel, the current bending roll force is compared with the rack balance force. If the current bending roll force is greater than the rack balance force, the single-sided bending roll force drop value of the target rack is determined according to the difference between the current bending roll force and the rack balance force to adjust the tail bending roll force of the strip.
[0008] In one embodiment of the present application, determining the unilateral bending roll force drop value of the target frame according to the difference between the current bending roll force and the frame balance force includes:
[0009] Obtaining a preset bending roll force reduction ratio of the target frame;
[0010] The single-side bending roll force reduction value is calculated according to the product of the bending roll force reduction ratio and the difference.
[0011] In one embodiment of the present application, when the rack before the target rack throws steel, it also includes:
[0012] Obtaining a current roll gap value of the target frame;
[0013] When the current roll gap value is less than the preset roll gap target value, the roll gap lifting values on both sides of the target frame are determined according to the preset roll gap lifting ratio of the target frame and the current roll gap value, so as to control the target frame to lift the roll gap according to the roll gap lifting values on both sides.
[0014] In one embodiment of the present application, the preset roller gap lifting ratio is 1-5 times the current roller gap value.
[0015] In one embodiment of the present application, when the rack before the target rack throws steel, it also includes:
[0016] Lowering the looper of the target rack to a preset small looper height;
[0017] When the steel throwing of the previous rack is completed, the looper of the target rack is lowered to the waiting position height.
[0018] In one embodiment of the present application, before the rack preceding the target rack throws steel, the method further includes:
[0019] Start a preset interactive interface and configure the frame parameters through the preset interactive interface, wherein the frame parameters include: the ratio of the bending roll force of each frame, the ratio of the roll gap lifting, and the height of the small sleeve.
[0020] The present application also provides a finishing strip tail load adjustment system, comprising:
[0021] A data acquisition module is used to obtain the current bending roll force and stand balance force of the target stand at the tail end of the finishing rolling mill;
[0022] The decision module is used to compare the current bending roll force with the frame balance force when the previous frame of the target frame throws steel. If the current bending roll force is greater than the frame balance force, the single-side bending roll force drop value of the target frame is determined according to the difference between the current bending roll force and the frame balance force to adjust the tail bending roll force of the strip.
[0023] As described above, the method and system for adjusting the tail load of a finishing strip of the present invention have the following beneficial effects.
[0024] The present application obtains the current bending roll force and frame balance force of the target frame at the tail of finishing rolling; when the frame before the target frame throws steel, the current bending roll force is compared with the frame balance force. If the current bending roll force is greater than the frame balance force, the single-side bending roll force reduction value of the target frame is determined according to the difference between the current bending roll force and the frame balance force to adjust the bending roll force at the tail of the strip. By automatically reducing the bending roll force of the rear frame, the quality defects of the tail of the strip such as the middle wave breaking, tail breaking and crushing at the tail of the strip can be effectively reduced, thereby ensuring the controlled quality of the tail of the strip and improving the rolling stability and yield rate of the production line. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 Schematic diagram of the flow of a method for adjusting the tail load of a finishing strip in one embodiment of the present application.
[0026] Figure 2 This is a module diagram of a finishing strip tail load adjustment system in one embodiment of the present application. DETAILED DESCRIPTION
[0027] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.
[0028] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.
[0029] See also Figure 1 , Figure 1 This is a flow chart of a method for adjusting the load of a tail of a finishing strip in an embodiment of the present application. The method for adjusting the load of a tail of a finishing strip provided in an embodiment of the present application comprises the following steps:
[0030] Step S100, obtaining the current bending roll force and frame balance force of the target frame at the tail end of finishing rolling;
[0031] In one embodiment, the hot rolling production line is usually provided with seven finishing stands F1-F7. The intermediate billet is bitten by the F1 finishing stand and then rolled by the F2-F7 stands in sequence. Finally, the F7 stand throws the steel to complete the rolling process from the intermediate billet to the finished strip. However, when rolling thin-gauge strip steel, the tail of the strip is prone to defects such as middle wave rolling and tail swing rolling, and the rolling and rolling defects usually occur in the downstream racks of the finishing rolling, for example, the F4-F7 finishing stands are used as the downstream racks. Therefore, the bending roll force of the downstream finishing stand can be adjusted in advance to reduce the problem of rolling and tail swing rolling defects caused by the middle wave at the tail of the strip. The finishing stand that needs to adjust the bending roll force is used as the target stand, and the current bending roll force and stand balance force of each target stand can be obtained, and the bending roll force is adjusted based on the current bending roll force and stand balance force of the target stand.
[0032] Step S101, when the previous frame of the target frame throws steel, the current bending roll force is compared with the frame balance force. If the current bending roll force is greater than the frame balance force, the unilateral bending roll force drop value of the target frame is determined according to the difference between the current bending roll force and the frame balance force to adjust the tail bending roll force of the strip.
[0033] In one embodiment, taking F4-F7 as the target frame as an example, when the previous frame F3 of F4 is throwing steel, it is necessary to adjust the frame bending roll force of F4, calculate the difference between the current bending roll force of F4 frame and the frame balance force of F4 frame, and determine the unilateral bending roll force reduction value of F4 frame according to the difference. Similarly, the difference between the current bending roll force and the frame balance force of each of F5-F7 frames can be calculated, and the unilateral bending roll force reduction value of each frame can be determined according to the difference.
[0034] In one embodiment, determining the unilateral bending roll force drop value of the target frame according to the difference between the current bending roll force and the frame balance force includes:
[0035] Obtaining a preset bending roll force reduction ratio of the target frame;
[0036] The single-side bending roll force reduction value is calculated according to the product of the bending roll force reduction ratio and the difference.
[0037] In one embodiment, the bending roll force reduction ratios of different target frames can be pre-set. After calculating the difference between the current bending roll force and the frame balance force of each target frame, the difference is multiplied by the corresponding bending roll force reduction ratio to obtain the single-side bending roll force reduction value of the corresponding target frame.
[0038] Specifically, the calculation process of the single-side bending roll force drop value can be expressed as follows: When the finishing rolling F3 stand is throwing steel, the bending roll force of the F4-F7 stand automatically decreases. The conditions and proportions of the automatic decrease of the bending roll force are as follows:
[0039]
[0040] Among them, Fbn is the frame balance force of the finishing mill stand n, where n = 4-7, the F4 frame balance force is 60 tons, and the F5-F7 balance force is 50 tons; when the current bending roll force is less than or equal to Fbn, the current bending roll force is kept unchanged; when the current bending roll force is greater than Fbn, the bending roll force is automatically reduced according to the reduction ratio; the F4-F7 frame bending roll force reduction ratio range is 50%-95%.
[0041] In one embodiment, the target frame bending roll force adjustment can also be started when any upstream frame starts to throw steel. For example, when the F1 frame throws steel, the single-side bending roll force drop value of each frame is calculated according to the current bending roll force of the F4-F7 frames and the frame balance force. The upstream frame that triggers the target frame bending roll force adjustment can be set and adjusted according to actual application requirements, and there is no limitation here.
[0042] In one embodiment, when the rack before the target rack throws steel, the method further includes:
[0043] Obtaining a current roll gap value of the target frame;
[0044] When the current roll gap value is less than the preset roll gap target value, the roll gap lifting values on both sides of the target frame are determined according to the preset roll gap lifting ratio of the target frame and the current roll gap value, so as to control the target frame to lift the roll gap according to the roll gap lifting values on both sides.
[0045] Specifically, the roll gap value of each target frame can be calculated. For example, the roll gap target value is 3 mm. At this time, if the actual roll gap of the target frame is less than 3 mm, the roll gap of the target frame is raised.
[0046] In one embodiment, if the target stand is F5-F7, when the finishing rolling stand F4 is casting steel, the F5-F7 stands calculate the roll gap lifting values on both sides according to the preset roll gap lifting ratio. The specific calculation method is shown in the following table:
[0047]
[0048] The current roll gap Gi is the target value of the locked roll gap when the F4 frame is throwing steel, i=5-7, and the roll gap lifting ratio range of the F5-F7 frame is 1.0-5.0 times.
[0049] In one embodiment, when the rack before the target rack throws steel, the method further includes:
[0050] Lowering the looper of the target rack to a preset small looper height;
[0051] When the steel throwing of the previous rack is completed, the looper of the target rack is lowered to the waiting position height.
[0052] Specifically, when the previous rack throws steel, the target rack looper drops to the preset small loop height in advance, and the looper of the target rack drops to the waiting position height after the previous rack throws steel. The looper small loop height values and waiting position height values of different racks can be set in advance. For example, the F1 rack drops the small looper based on the signal of the pinch roller throwing steel after the fine descaling box, and the other racks drop the small looper when the previous rack throws steel, and drop to the waiting position height after the previous rack throws steel.
[0053] In one embodiment, a human-machine interaction interface can be set as a preset interaction interface, and the production operator sets the parameters of each frame through the human-machine interaction interface before thin gauge rolling. The setting parameters may include the ratio of the bending roll force of each frame, the ratio of the roll gap lifting, the height of the small looper, the height of the waiting position of the looper, etc. For example, the height range of the small looper of each frame can be set between 15° and 18°.
[0054] Based on the above technical scheme, the present application realizes automatic reduction of the load of the rear frame when the previous frame throws steel at the tail of the thin-gauge strip by automatically reducing the bending roll force, automatically raising the roll gap, and dropping the small loop in advance during the rolling of the thin-gauge strip, so as to achieve stable rolling and control of the thin-gauge strip tail, reduce accidents such as the middle wave breaking of the strip tail, the tail breaking and crushing, effectively improve the rolling stability of the thin-gauge strip tail, avoid repetitive manual operation adjustments, reduce the labor intensity of operators, and ensure smooth production of the production line and stable product quality control.
[0055] See also Figure 2 This embodiment also provides a finishing strip tail load adjustment system, which is used to perform the finishing strip tail load adjustment method described in the above method embodiment. Since the technical principle of the system embodiment is similar to the technical principle of the above method embodiment, the same technical details will not be repeated.
[0056] In one embodiment, a load adjustment system for the tail of a finishing strip includes: a data acquisition module 10, which is used to obtain the current bending roll force and the frame balance force of the target frame at the tail of finishing rolling; a decision module 11, which is used to compare the current bending roll force with the frame balance force when the previous frame of the target frame is throwing steel. If the current bending roll force is greater than the frame balance force, the single-sided bending roll force reduction value of the target frame is determined according to the difference between the current bending roll force and the frame balance force to adjust the bending roll force at the tail of the strip.
[0057] In one embodiment, the decision module 11 is also used for, when the previous rack of the target rack is throwing steel, also including: obtaining the current roll gap value of the target rack; when the current roll gap value is less than the preset roll gap target value, determining the roll gap lifting values on both sides of the target rack according to the preset roll gap lifting ratio of the target rack and the current roll gap value, so as to control the target rack to lift the roll gap according to the roll gap lifting values on both sides.
[0058] In one embodiment, the decision module 11 is also used for: when the previous rack of the target rack is throwing steel, it also includes: lowering the loop of the target rack to a preset small loop height; when the previous rack completes throwing steel, lowering the loop of the target rack to the waiting position height.
[0059] The present application realizes automatic reduction of the load of the rear frame when the front frame throws steel at the tail of the thin-gauge strip by automatically reducing the bending roll force, automatically raising the roll gap, and dropping the small loop in advance during the rolling of the thin-gauge strip, thereby realizing stable rolling and control of the thin-gauge strip tail, reducing accidents such as the middle wave breaking of the strip tail, the tail breaking and crushing, effectively improving the rolling stability of the thin-gauge strip tail, avoiding repetitive manual operation adjustments, reducing the labor intensity of operators, and ensuring smooth production of the production line and stable product quality control.
[0060] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.
Claims
1. A method for adjusting the tail load of a finishing strip, characterized in that: include: Obtain the current bending roll force and stand balance force of the target stand at the tail end of finishing rolling; When the previous rack of the target rack throws steel, the current bending roll force is compared with the rack balance force. If the current bending roll force is greater than the rack balance force, the unilateral bending roll force drop value of the target rack is determined according to the difference between the current bending roll force and the rack balance force to adjust the tail bending roll force of the strip; Determine the unilateral bending roll force reduction value of the target frame according to the difference between the current bending roll force and the frame balance force, including: obtaining the preset bending roll force reduction ratio of the target frame; calculating the unilateral bending roll force reduction value according to the product of the bending roll force reduction ratio and the difference; when the previous frame of the target frame throws steel, it also includes: obtaining the current roll gap value of the target frame; when the current roll gap value is less than the preset roll gap target value, determine the roll gap lifting values on both sides of the target frame according to the preset roll gap lifting ratio of the target frame and the current roll gap value, so as to control the target frame to lift the roll gap according to the roll gap lifting values on both sides; when the previous frame of the target frame throws steel, it also includes: lowering the looper of the target frame to a preset small looper height; when the previous frame completes throwing steel, lowering the looper of the target frame to the waiting position height.
2. The method for adjusting the tail load of a finishing strip according to claim 1, characterized in that: The preset roll gap lifting ratio is 1-5 times of the current roll gap value.
3. The method for adjusting the tail load of a finishing strip according to claim 1 or 2, characterized in that: Before the rack preceding the target rack throws steel, the method further includes: Start a preset interactive interface and configure the frame parameters through the preset interactive interface, wherein the frame parameters include: the ratio of the bending roll force of each frame, the ratio of the roll gap lifting, and the height of the small sleeve.
4. A finishing strip tail load adjustment system for executing the finishing strip tail load adjustment method according to any one of claims 1 to 3, characterized in that: include: A data acquisition module is used to obtain the current bending roll force and stand balance force of the target stand at the tail end of the finishing rolling mill; The decision module is used to compare the current bending roll force with the frame balance force when the previous frame of the target frame throws steel. If the current bending roll force is greater than the frame balance force, the single-side bending roll force drop value of the target frame is determined according to the difference between the current bending roll force and the frame balance force to adjust the tail bending roll force of the strip.
Citation Information
Patent Citations
Method for controlling finish rolling roll bending force on tail of hot-rolled strip
CN106623441A
Intelligent 1+4 hot continuous rolling tank body material tail control method
CN109092907A