A control method and device for a finishing mode

Abstract

The present application relates to the field of metal rolling technology, and more particularly to a control method for a skin-passing mode, which is applied to a skin-passing mill, including for skin-passing welds. The method comprises determining whether the strip forming the weld meets a preset thickness condition; if the thickness condition is met, determining whether the exit tension of the skin-passing mill meets a preset first tension condition; if the first tension condition is met, determining whether a preset second tension condition or a preset width condition is met; and if the judgment result is yes, operating a reduced rolling force mode. The method provided in the present application automatically identifies the weld type and automatically operates a reduced rolling force mode based on the identification result, thereby improving the control accuracy of the skin-passing process and reducing labor costs.

Description

Technical Field

[0001] The present application relates to the technical field of metal rolling, and in particular to a control method and device for a finishing mode. Background Art

[0002] Skin pass is a key quality control link in the galvanizing production line. During the skin pass process of the strip, in order to improve the yield rate of the strip head and tail, the normal rolling mode is adopted when the weld of the strip passes through the skin pass mill. When the specifications of the steel grades before and after the weld are too different, the normal rolling mode will cause the risk of strip breakage. Therefore, in this case, the normal rolling mode needs to be switched to the reduced rolling force mode to ensure that the weld passes through the skin pass mill normally.

[0003] Mode switching requires adjusting multiple control parameters of the finishing machine, which is difficult to adjust. Manual judgment and mode switching are not only prone to errors, but also consume a lot of manpower costs. Summary of the Invention

[0004] In order to improve control accuracy and reduce labor costs,

[0005] In a first aspect, the present application provides a control method for a skin-passing mode, which is applied to a skin-passing machine, including for skin-passing a weld, and the method comprises:

[0006] Determine whether the strip steel forming the weld meets the preset thickness condition,

[0007] When the thickness condition is met, determining whether the outlet tension of the skin-pass machine meets a preset first tension condition;

[0008] When the first tension condition is met, determining whether a preset second tension condition or a preset width condition is met;

[0009] When the judgment result is yes, the rolling force reduction mode is operated.

[0010] Furthermore, the thickness condition includes that the thickness value D of the strip steel is lower than a preset thickness threshold;

[0011] The thickness threshold is 0.5 mm; the strip steel forming the weld includes a front section strip steel and a rear section strip steel forming the weld.

[0012] Furthermore, the first tension condition includes: the skin-pass mill outlet tension of the rear-end strip steel minus the skin-pass mill outlet tension of the front-end strip steel ≥ +15KN.

[0013] Furthermore, the second tension condition includes:

[0014] (the skin-pass mill outlet tension of the front-end strip steel - the skin-pass mill outlet tension of the rear-end strip steel) / the skin-pass mill outlet tension of the rear-end strip steel ≥ +38.9%,

[0015] Or (the skin-pass mill outlet tension of the front-end strip - the skin-pass mill outlet tension of the rear-end strip) / the skin-pass mill outlet tension of the rear-end strip ≤ -28.0%;

[0016] The width conditions include:

[0017] The width of the front strip steel minus the width of the rear strip steel is ≥ 150 mm.

[0018] The width of the rear strip steel minus the width of the front strip steel is ≥150mm.

[0019] Furthermore, the rolling force control mode includes adjusting the elongation of the skin-pass mill according to the position of the weld, and adjusting the rolling force of the skin-pass mill to a preset value of the rolling force.

[0020] Furthermore, the method further includes obtaining strip information of the strip steel, wherein the strip steel information includes a width value, a thickness value and a set value of the tension of the strip steel.

[0021] In a second aspect, the present application provides a control device for a finishing mode, including a mode judgment module for judging whether to operate a rolling force reduction mode, including:

[0022] The thickness judgment module is used to judge whether the strip steel forming the weld meets the preset thickness conditions.

[0023] a tension judging module, for judging whether the outlet tension of the skin-pass machine satisfies a preset first tension condition and a second tension condition when the thickness condition is met;

[0024] The width judgment module is used to judge whether a preset width condition is met when the first tension condition is met.

[0025] Furthermore, it also includes,

[0026] An information acquisition module, configured to obtain strip information of the strip steel, wherein the strip steel information includes a width value, a thickness value, and a set value of tension of the strip steel;

[0027] The rolling force reduction module is used to control the rolling force of the skin-pass mill.

[0028] In a third aspect, the present application provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements any of the method steps described in the first aspect when executing the program.

[0029] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, characterized in that when the program is executed by a processor, the method steps described in any one of the first aspects are implemented.

[0030] Beneficial effects:

[0031] A control method for a skin-passing mode, applied to a skin-passing mill, includes a method for skin-passing a weld seam. The method comprises determining whether the strip forming the weld seam meets a preset thickness condition; if the thickness condition is met, determining whether the exit tension of the skin-passing mill meets a preset first tension condition; if the first tension condition is met, determining whether a preset second tension condition or a preset width condition is met; and if the judgment result is yes, operating a reduced rolling force mode. This application automatically identifies the weld type by determining the thickness, width, and tension values of the strip steel, and automatically operates a reduced rolling force mode based on the identification result, thereby improving the control accuracy of the skin-passing process and reducing labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0033] Figure 1 This is a flow chart of a control method for a finishing mode provided in Example 1 of the present application;

[0034] Figure 2 This is a schematic structural diagram of a control method for a finishing mode provided in Example 2 of the present application;

[0035] Figure 3 This is a schematic diagram of the structure of an electronic device provided in Example 3 of the present application. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application.

[0037] Example 1

[0038] Combined with attachment Figure 1 When the specifications of the front section of the strip steel forming the strip weld are too different from those of the rear section of the strip steel, in order to prevent the strip steel from breaking at the weld during the skin-passing process, based on the analysis and summary of historical production experience, Example 1 provides a control method for the skin-passing mode, including:

[0039] S1, obtain strip steel information;

[0040] Reading information of the front and rear sections of the strip forming the weld in a strip tracking system, wherein the strip information includes a width value, a thickness value, and a set value of the tension of the strip;

[0041] When the difference in thickness between the front and rear sections of the strip forming the weld exceeds the industry standard allowed by the skin-passing process, due to the uneven thickness of the strip welds, the welds are subjected to uneven stress during the skin-passing process, and the relatively thin sections of the welds are prone to fracture.

[0042] When the difference in width between the front and rear sections of the strip forming the weld exceeds the industry standard allowed by the skin-passing process, the weld seams are subjected to uneven pressure at various locations during the skin-passing process. During the skin-passing process, the narrower sections are more likely to break due to the greater pressure.

[0043] When the difference in tension between the front and rear sections of the weld exceeds the industry standard for the skin-passing process, the weld is prone to fracture at the location with the larger tension value during the skin-passing process.

[0044] Therefore, the width, thickness and tension values of the front and rear strips forming the weld are selected for calculation and comparison to determine whether mode switching is required when the weld passes through the skin pass mill.

[0045] S2, determine whether the strip steel forming the weld meets the thickness requirements,

[0046] When the thickness of the strip forming the weld is less than 0.5mm, when the normal rolling mode is used for skin pass, the weld may break due to excessive rolling force; therefore, the thickness threshold is set to 0.5mm;

[0047] When the thickness condition is met, the thickness of the front strip D1 ≤ 0.5mm, or the thickness of the rear strip D2 ≤ 0.5mm,

[0048] Since the strip will not necessarily break when only the thickness condition is met, it is possible that the strip will break when the thickness is lower than the thickness threshold and the difference in tension between the front and rear strips forming the weld reaches 15KN or more. The set value of the exit tension of the front strip skin-pass mill is generally lower than the set value of the exit tension of the rear strip skin-pass mill.

[0049] Therefore, the first tension condition is set as follows: the exit tension of the rear strip skin-pass mill - the exit tension of the front strip skin-pass mill ≥ +15KN;

[0050] S3, determining whether the outlet tension of the skin-pass machine meets a preset first tension condition;

[0051] S4, when the first tension condition is met, determining whether a preset second tension condition or a preset width condition is met;

[0052] Since the strip will not necessarily break when only the thickness condition and the first tension condition are met, according to production experience, the strip should also meet

[0053] When (the skin-pass mill outlet tension of the front-end strip steel - the skin-pass mill outlet tension of the rear-end strip steel) / the skin-pass mill outlet tension of the rear-end strip steel ≥ +38.9%,

[0054] Or (the skin-pass mill outlet tension of the front-end strip - the skin-pass mill outlet tension of the rear-end strip) / the skin-pass mill outlet tension of the rear-end strip ≤ -28.0%;

[0055] Or when the width of the front strip minus the width of the rear strip is ≥150mm, and the width of the rear strip minus the width of the front strip is ≥150mm, since the difference in width between the front and rear strips forming the weld exceeds the industry standard allowed by the skin-passing process, the narrower weld width is more likely to break during the skin-passing process due to the greater pressure.

[0056] Fracture will only occur at the weld, and at this time it is necessary to enter the rolling force reduction mode;

[0057] Therefore, when the thickness condition and the first tension condition are met,

[0058] The second tension condition is set to (the skin-pass mill outlet tension of the front-end strip - the skin-pass mill outlet tension of the rear-end strip) / the skin-pass mill outlet tension of the rear-end strip ≥ +38.9%,

[0059] Or (the skin-pass mill outlet tension of the front-end strip - the skin-pass mill outlet tension of the rear-end strip) / the skin-pass mill outlet tension of the rear-end strip ≤ -28.0%;

[0060] Set the width condition to,

[0061] The width of the front strip steel minus the width of the rear strip steel is ≥ 150 mm, and

[0062] The width of the rear strip steel minus the width of the front strip steel is ≥ 150 mm;

[0063] S5, when the judgment result is yes, running the rolling force reduction mode;

[0064] That is, when it is determined that the thickness condition, the first tension condition, and the second tension condition are met at the same time,

[0065] Or determine whether the thickness condition, the first tension condition, and the width condition are satisfied at the same time.

[0066] Switch the skin-pass mode from normal mode to reduced rolling force mode;

[0067] Table 1 shows the six welds tested using the method provided in Example 1:

[0068]

[0069] For weld 1, the thickness of the rear strip D2>0.8mm does not meet the thickness condition, so the rolling force reduction mode is not run for weld 1;

[0070] For weld 2, the thickness condition is met, but Z1-Z2=14KN<15KN, which does not meet the first tension condition. The rolling force reduction mode is not run for weld 2.

[0071] For weld 3, the thickness condition and the first tension condition are met, but the second tension condition and the width condition are not met, so the reduced rolling force mode is not run for weld 3;

[0072] For weld 4, if the thickness condition and the first tension condition are met, and the second tension condition is met, the reduced rolling force mode is run for weld 4;

[0073] For weld 5, the thickness condition and the first tension condition are met, and the width condition is met, and the reduced rolling force mode is run for weld 5;

[0074] For the weld seam 6 , the thickness condition and the first tension condition are satisfied, and the second tension condition and the width condition are satisfied, and the reduced rolling force mode is operated for the weld seam 6 .

[0075] S6, controls the strip rolling force, including,

[0076] Turn off the elongation controller and clear the elongation controller output to prevent adjustment based on the previous parameters after it is turned on;

[0077] Reduce the rolling force setting to 500KN;

[0078] After the weld passes through the skin-pass mill, the rolling force is increased to the set value, which can be a manual set value or a secondary set value, determined by the selection on the HMI interface;

[0079] When the rolling force reaches the set value, the elongation controller is turned on and automatic control is started.

[0080] The method provided in Example 1 automatically determines whether the weld needs to be welded using the reduced rolling force mode by reading the specifications of the front strip and the parameter settings of the rear strip that form the weld, without manual judgment.

[0081] When the method determines that the reduced rolling force welding mode is needed, the method automatically executes the mode and automatically returns to the original normal mode after the welding seam is passed without manual intervention;

[0082] This method uses the reduced rolling force mode only for special welds, while the normal rolling mode is used for other welds, which improves the control accuracy and the strip yield rate at the welds. Since the system is automatically controlled throughout the process, the labor cost is reduced.

[0083] The economic benefits of this method are:

[0084] Currently, the cost of zinc ingots is RMB 0.0022 million per kilogram. On average, 100 kilograms of zinc ingots are consumed per roll of steel. After using this solution, an average of 1 kilogram of zinc ingots can be saved per roll of steel. The average daily production volume is 50 rolls. The benefits are calculated as follows:

[0085] Annual benefit = number of steel coils produced per day x number of zinc ingots saved per coil x price of zinc ingots x 365 days = 50 coils / day x 1 kg x 0.002 million yuan / kg x 365 days = 365,000 yuan.

[0086] The social benefits of this method are:

[0087] Through the development of this function, manual operation is transformed into automatic control, which effectively reduces the workload of operators. On-the-job personnel can focus more on other quality control points, which is beneficial to product quality improvement and production cost control.

[0088] Example 2

[0089] Combined with attachment Figure 2 , embodiment 2 provides a control device for a lightening mode, comprising

[0090] An information acquisition module 100 is used to obtain strip information of the strip, wherein the strip information includes a width value, a thickness value, and a set value of tension of the strip;

[0091] The mode judgment module 200 is used to judge whether to operate the rolling force reduction mode, including:

[0092] The thickness judgment module 201 is used to judge whether the strip steel forming the weld meets the preset thickness condition.

[0093] The tension determination module 202 is configured to determine whether the exit tension of the skin-pass machine satisfies a preset first tension condition and a preset second tension condition when the thickness condition is met;

[0094] A width determination module 203 is configured to determine whether a preset width condition is met when the first tension condition is met;

[0095] The rolling force reduction module 300 is used to control the rolling force of the skin-pass mill.

[0096] When a weld enters the skin-pass mill, the skin-pass mode control device analyzes the strip information to determine the weld type. If the weld type meets the requirements for reduced-rolling-force mode, the skin-pass mode is automatically adjusted to reduced-rolling-force mode, thereby improving control accuracy and increasing the strip yield rate at the weld. Since the entire process is automatically controlled, labor costs are also reduced.

[0097] Example 3

[0098] Combined with attachment Figure 3 Based on the same inventive concept, embodiment 3 of the present invention provides an electronic device, including a memory 304, a processor 302, and a computer program stored in the memory 304 and executable on the processor 302, wherein the processor 302 implements the steps of the above-mentioned control method of the smoothing mode when executing the program.

[0099] Among them, Figure 3 In the embodiment of the present invention, a bus architecture (represented by bus 300) is shown. Bus 300 may include any number of interconnected buses and bridges, and bus 300 links together various circuits including one or more processors represented by processor 302 and memory represented by memory 304. Bus 300 may also link together various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. Bus interface 306 provides an interface between bus 300 and receiver 301 and transmitter 303. Receiver 301 and transmitter 303 may be the same component, namely a transceiver, which provides a unit for communicating with various other devices over a transmission medium. Processor 302 is responsible for managing bus 300 and general processing, while memory 304 may be used to store data used by processor 302 when performing operations.

[0100] Example 4

[0101] Based on the same inventive concept, embodiment 4 of the present invention provides a computer-readable storage medium storing a computer program, which implements the steps of the above-mentioned control method of the finishing mode when executed by a processor.

[0102] The algorithm and display provided herein are not inherently related to any particular computer, virtual system or other device. Various general-purpose systems can also be used together with the teachings based on this. According to the above description, it is obvious that the structure required for constructing this type of system. In addition, the present invention is not directed to any specific programming language. It should be understood that various programming languages can be utilized to realize the content of the present invention described herein, and the above description of specific languages is for the purpose of disclosing the best mode of the present invention.

[0103] The above is only an embodiment of the present application. Common knowledge such as the known specific structures and characteristics in the scheme is not described in detail here. Ordinary technicians in the relevant field are aware of all common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all existing technologies in the field, and have the ability to apply conventional experimental means before that date. Ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the inspiration given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of this application, several variations and improvements can be made, which should also be regarded as the scope of protection of this application. These will not affect the effect of the implementation of this application and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A control method for a skin-passing mode, applied to a skin-passing machine, including a method for skin-passing a weld, characterized in that: The method comprises: Determining whether the steel strip forming the weld meets a preset thickness condition, wherein the thickness condition includes that a thickness value D of the steel strip is lower than a preset thickness threshold; The thickness threshold is 0.5 mm; the strip steel forming the weld includes the front strip steel and the rear strip steel forming the weld; When the thickness condition is met, determining whether the outlet tension of the skin-pass machine meets a preset first tension condition; When the first tension condition is met, determining whether a preset second tension condition or a preset width condition is met; When the judgment result is yes, the rolling force reduction mode is operated; The first tension condition includes: the skin-pass mill outlet tension of the rear-end strip steel minus the skin-pass mill outlet tension of the front-end strip steel ≥ +15KN; The second tension condition includes: (Exit tension of skin-pass mill for the front strip - Exit tension of skin-pass mill for the back strip) / Exit tension of skin-pass mill for the back strip ≥ +38.9%, Or (the skin-pass mill outlet tension of the front-end strip - the skin-pass mill outlet tension of the rear-end strip) / the skin-pass mill outlet tension of the rear-end strip ≤ -28.0%; The width conditions include: The width of the front strip steel minus the width of the rear strip steel is ≥ 150 mm. The width of the rear strip steel minus the width of the front strip steel is ≥150mm.

2. A control method for a finishing mode according to claim 1, characterized in that: The elongation of the skin-pass mill is adjusted according to the position of the weld, and the rolling force of the skin-pass mill is adjusted to a preset value of the rolling force.

3. The method for controlling a finishing mode according to claim 1, wherein: The method also includes obtaining strip information of the strip steel, where the strip steel information includes a width value, a thickness value, and a set value of tension of the strip steel.

4. A control device for a light-shaving mode, used to implement the control method for a light-shaving mode according to any one of claims 1 to 3, characterized in that: Including a mode judgment module for judging whether to operate the rolling force reduction mode, including: a thickness determination module, configured to determine whether the strip steel forming the weld meets a preset thickness condition, wherein the thickness condition includes that the thickness value D of the strip steel is lower than a preset thickness threshold; The thickness threshold is 0.5 mm; the strip steel forming the weld includes the front strip steel and the rear strip steel forming the weld; a tension judging module, for judging whether the outlet tension of the skin-pass machine satisfies a preset first tension condition and a second tension condition when the thickness condition is met; The width judgment module is used to judge whether a preset width condition is met when the first tension condition is met.

5. A control device for a finishing mode according to claim 4, characterized in that: Also includes, An information acquisition module, configured to obtain strip information of the strip steel, wherein the strip steel information includes a width value, a thickness value, and a set value of tension of the strip steel; The rolling force reduction module is used to control the rolling force of the skin-pass mill.

6. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the method according to any one of claims 1 to 3 is implemented.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to any one of claims 1 to 3 is implemented.

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