A method for cold straightening composite plates
By combining a pass-by-pass straightening parameter model with a reversible nine-roll cold straightener, the problem of poor plate shape during the cold straightening of composite plates was solved, achieving a high-efficiency and low-cost straightening effect for composite plates.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHOUGANG JINGTANG IRON & STEEL CO LTD
- Filing Date
- 2023-10-08
- Publication Date
- 2026-05-26
AI Technical Summary
Composite panels are prone to defects such as warping or buckling during production. Existing single tilting roller straightening methods are difficult to effectively straighten composite panels with high yield strength, and heat treatment costs are high.
A pass-by-pass straightening parameter model is adopted, including a five-pass straightening parameter model. Combined with a reversible nine-roll cold straightener, the straightening speed and roll gap difference are controlled by adjusting the tilting of the inclined rolls, the roll gap height, and the parallel rolls, thereby eliminating poor panel shape of the composite board.
The composite plate was efficiently straightened under cold conditions, which improved the flatness and pass rate of the steel plate and reduced the straightening cost.
Smart Images
Figure CN117380782B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of steel plate straightening technology, and in particular to a method for cold straightening composite plates. Background Technology
[0002] A composite plate consists of an outermost layer of carbon steel and two middle layers of stainless steel. This composite plate is manufactured by rolling the carbon steel and stainless steel plates under high vacuum conditions while they are in a physically pure state. However, during the production process, composite plates are prone to various shape defects such as warping, buckling, or curling. The surface flatness of the composite plate directly affects the final quality of the steel plate, significantly reducing the final pass rate. To improve the shape of the composite plate and ensure that the flatness meets the standards, cold straightening is performed.
[0003] Currently, most straightening methods use a single inclined roller, which has a good straightening effect. However, composite plates have a high yield strength, increasing the difficulty of achieving satisfactory straightening. Stress concentration areas are difficult to straighten, thus affecting the flatness of the straightened steel plate. For this inclined roller straightening method, heat treatment is usually applied before straightening to reduce the internal stress of the steel plate and improve the straightening effect, but the straightening cost is high. Summary of the Invention
[0004] This application provides a cold straightening method for composite panels to solve the technical problem of poor panel shape in existing composite panel production.
[0005] In a first aspect, this application provides a method for cold straightening composite plates, the method comprising:
[0006] Determine the thickness of the composite board;
[0007] The straightening speed is set according to the thickness of the composite plate;
[0008] The straightening parameter model is set for each lane.
[0009] Optionally, the thickness of the composite plate is 10-20 mm.
[0010] Optionally, setting the straightening speed according to the thickness of the composite plate includes setting the straightening speed to ≤0.5m / s when the thickness of the composite plate is 10-15mm.
[0011] Optionally, setting the straightening speed according to the thickness of the composite plate includes setting the straightening speed to ≤0.4m / s when the thickness of the composite plate is 15-20mm.
[0012] Optionally, the step-by-step straightening process parameter setting includes: setting a straightening parameter model in five steps.
[0013] Optionally, the five-pass straightening parameter model includes: in the first pass straightening, setting the tilting motion of the tilting roller and the roller gap height; wherein the tilting motion of the tilting roller is 2 to 5 mm, and the roller gap height is -1.6 to -2 mm.
[0014] Optionally, the step of setting the straightening parameter model in five passes includes: in the second straightening pass, selecting the model as negative bending roller density and setting the tilting roller straightening tilt; wherein the tilting roller straightening tilt is 0mm.
[0015] Optionally, the step of setting the straightening parameter model in five stages includes setting the straightening parameter model in five stages; wherein the straightening parameter model of the third stage is consistent with the straightening process parameters of the first stage.
[0016] Optionally, the step of setting the straightening parameter model in five stages includes setting the straightening parameter model in five stages; wherein the straightening parameter model in the fourth stage is consistent with the straightening process parameters in the second stage.
[0017] Optionally, the five-pass straightening parameter model includes: in the fifth straightening pass, using parallel roller straightening, selecting a model with severe head and tail curling, and controlling the height of the exit feed roller for the parallel roller straightening; wherein the height of the exit feed roller is -1.5 to -2 mm.
[0018] The technical solutions provided in this application have the following advantages compared with the prior art:
[0019] The composite plate cold straightening method provided in this application embodiment, by adopting a composite plate cold straightening method under cold conditions, does not require any heat treatment, thus ensuring the plate shape quality of the straightened composite plate and greatly improving the straightening efficiency and steel plate qualification rate. Attached Figure Description
[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.
[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0022] Figure 1 A schematic flowchart of a composite plate cold straightening method provided in an embodiment of this application;
[0023] Figure 2 This is a schematic diagram of the steel plate before straightening provided in Embodiment 1 of this application;
[0024] Figure 3 This is a schematic diagram of the straightened steel plate provided in Embodiment 1 of this application;
[0025] Figure 4 This is a schematic diagram of the steel plate before straightening provided in Embodiment 2 of this application;
[0026] Figure 5 This is a schematic diagram of the straightened steel plate provided in Embodiment 2 of this application;
[0027] Figure 6 This is a schematic diagram of the steel plate before straightening provided in Embodiment 3 of this application;
[0028] Figure 7 This is a schematic diagram of the straightened steel plate provided in Embodiment 3 of this application;
[0029] Figure 8 This is a schematic diagram of the steel plate before straightening provided in Comparative Example 1 of this application;
[0030] Figure 9 This is a schematic diagram of the straightened steel plate provided in Comparative Example 1 of this application. Detailed Implementation
[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0032] Various embodiments of this application may exist in the form of a range; it should be understood that the description in the form of a range is merely for convenience and brevity and should not be construed as a hard limitation on the scope of this application; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single numerical values within that range. For example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., and single numbers within the range, such as 1, 2, 3, 4, 5, and 6, regardless of the range. Furthermore, whenever a numerical range is referred to herein, it means including any referenced number (fraction or integer) within the referred range.
[0033] In this application, unless otherwise stated, directional terms such as "upper" and "lower" specifically refer to the drawing directions in the accompanying drawings. Furthermore, in the description of this application, terms such as "comprising" and "including" mean "including but not limited to." In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. In this document, "and / or" describes the relationship between related objects, indicating that three relationships can exist; for example, A and / or B can represent: A alone, A and B simultaneously, or B alone. A and B can be singular or plural. In this document, "at least one" means one or more, and "more than one" means two or more. "At least one," "at least one of the following," or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, "at least one of a, b, or c" or "at least one of a, b, and c" can both mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can be a single or multiple.
[0034] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this application can be purchased from the market or prepared by existing methods.
[0035] Firstly, this application provides a method for cold straightening composite plates; please refer to [link to relevant documentation]. Figure 1 The method includes:
[0036] S1. Determine the thickness of the composite board;
[0037] In some embodiments, the thickness of the composite plate is 10–20 mm.
[0038] In this embodiment, the composite plate cold straightening method utilizes a reversible nine-roll cold straightener, comprising four upper straightening rollers and five lower straightening rollers. This method is suitable for composite plates with a thickness of 10–20 mm, and its positive effects include: improved straightening strength range and good straightening effect on the unevenness of the steel plate's ends. Specifically, the thickness of the composite plate can be 11 mm, 13 mm, 15 mm, 19 mm, etc.
[0039] S2. Set the straightening speed according to the thickness of the composite plate;
[0040] In some embodiments, setting the straightening speed according to the thickness of the composite plate includes setting the straightening speed to ≤0.5m / s when the thickness of the composite plate is 10-15mm.
[0041] In some embodiments, setting the straightening speed according to the thickness of the composite plate includes setting the straightening speed to ≤0.4m / s when the thickness of the composite plate is 15-20mm.
[0042] In this embodiment, when the thickness of the composite plate is 10-15mm, the straightening speed is set to ≤0.5m / s. The positive effect is that setting the straightening speed according to the thickness range reduces the slippage of the steel plate. If the straightening speed is too high, it will increase the unevenness of the composite plate during straightening to a certain extent, greatly reducing the straightening efficiency. Specifically, when the thickness of the composite plate is 10-15mm, the straightening speed can be set to 0.5m / s, 0.4m / s, 0.45m / s, etc.
[0043] When the thickness of the composite plate is 15-20mm, setting the straightening speed to ≤0.4m / s has the following positive effect: setting the straightening speed according to the thickness range reduces the slippage of the steel plate. If the straightening speed is too high, it will increase the unevenness of the plate shape during straightening to a certain extent, and the straightening efficiency will be greatly reduced. Specifically, when the thickness of the composite plate is 15-20mm, the straightening speed can be set to 0.3m / s, 0.4m / s, 0.35m / s, etc.
[0044] S3, Set straightening parameter model by lane.
[0045] In some implementations, the step-by-step straightening process parameter setting includes: setting a straightening parameter model in five steps.
[0046] In some embodiments, the five-pass straightening parameter model includes: in the first pass straightening, setting the tilting motion of the tilting roller and the roller gap height; wherein the tilting motion of the tilting roller is 2 to 5 mm, and the roller gap height is -1.6 to -2 mm.
[0047] In this embodiment, during the straightening process, the actual straightening force must differ from the rated straightening force by less than 10%. The model is selected to minimize head and tail warping, ensuring deformation of the steel plate after straightening and requiring a large degree of head and tail warping. In the first straightening pass, setting the tilting roller's tilt angle to 2-5mm has the positive effect of ensuring deformation of the straightened steel plate and resulting in a large degree of head and tail warping. If the tilting roller's tilt angle is too large, it may cause the head and tail warping of the steel plate to exceed the limit; if the tilting roller's tilt angle is too small, it may reduce the head and tail warping of the steel plate to some extent. Specifically, the tilting roller's tilt angle can be 2mm, 3mm, 4mm, 5mm, etc. Setting the roller gap height to -1.6 to -2mm has the positive effect of ensuring that the actual straightening force differs from the rated straightening force by less than 10% during the straightening process, thus enhancing the straightening effect. Specifically, the roll gap height can be -1.6mm, -1.8mm, -2.0mm, etc.
[0048] In some embodiments, the step of setting the straightening parameter model in five passes includes: in the second straightening pass, selecting the model as negative bending roller density and setting the tilting roller straightening tilt; wherein the tilting roller straightening tilt is 0mm.
[0049] In the embodiments of this application, in order to eliminate the transverse arc of the steel plate, the roll gap of the second straightening is appropriately adjusted according to the head and tail wagging effect of the first straightening to ensure the straightening force, and the tilting is canceled and adjusted to 0.
[0050] In some implementations, the step of setting the straightening parameter model in five passes includes setting the straightening parameter model in five passes; wherein the straightening parameter model of the third pass is consistent with the straightening process parameters of the first pass.
[0051] In the embodiments of this application, the positive effect of setting the third straightening parameter model to be the same as that of setting the first straightening parameter model is that the third straightening is the same as the first straightening parameter model. The roll gap value can be flexibly adjusted according to the actual situation to ensure that the actual straightening force is within 10% of the rated straightening force, making up for the deficiencies of the first two passes and ensuring the warping effect at the beginning and end.
[0052] In some implementations, the step of setting the straightening parameter model in five passes includes setting the straightening parameter model in five passes; wherein the straightening parameter model of the fourth pass is consistent with the straightening process parameters of the second pass.
[0053] In the embodiments of this application, the positive effect of setting the fourth straightening parameter model to be consistent with the second straightening parameter model is that the fourth straightening is the same as the second straightening parameter model. The roll gap value can be flexibly adjusted according to the actual situation to ensure that the actual straightening force is within 10% of the rated straightening force, making up for the deficiencies of the first two passes and ensuring the warping effect at the beginning and end.
[0054] In some embodiments, the five-pass straightening parameter model includes: in the fifth pass straightening, using parallel roller straightening, selecting a model with severe head and tail curling, and controlling the height of the exit feed roller for the parallel roller straightening; wherein the height of the exit feed roller is -1.5 to -2 mm.
[0055] In this embodiment, during the fifth straightening pass, a model with severe head and tail warping is selected to eliminate the problem of poor plate shape at the head and tail of the steel plate. The positive effect of using parallel roller straightening for the fifth straightening pass is the elimination of residual stress in the composite plate. The positive effect of controlling the exit feed roller height of the parallel roller straightening to -1.5 to -2 mm is the guarantee that the flatness of the output composite plate meets the requirements. Specifically, the exit feed roller height can be -1.5 mm, -1.7 mm, -2.0 mm, etc.
[0056] The present application is further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the application. Experimental methods in the following embodiments that do not specify specific conditions are generally determined according to national standards. If there is no corresponding national standard, then general international standards, conventional conditions, or conditions recommended by the manufacturer are followed.
[0057] This application provides a method for cold straightening of composite plates, the method comprising:
[0058] S11. Determine the thickness of the composite board;
[0059] S21. Set the straightening speed according to the thickness of the composite plate;
[0060] S31. Set the straightening parameter model for each pass. For specific process parameter settings, please refer to Examples 1-3. For the plate shape control results, please refer to Table 1.
[0061] Example 1
[0062] Steel grade 316L+Q370qE, dimensions are 19mm*3000mm*7200mm
[0063] Specifically, the steps include the following:
[0064] (1) Based on the thickness of the composite board being 19mm, adjust the straightening speed to 0.4m / s.
[0065] (2) The tilting of the first pass of cold straightening is set to +3mm, and the roll gap value is set to -1.6mm.
[0066] (3) In order to eliminate the transverse arc of the steel plate, the second pass of cold straightening is based on the straightening effect of the first pass. The roll gap value is set to -1.2mm, the model is selected as negative bending roll weight, and the tilt adjustment is 0.
[0067] (4) The parameter model for the third pass of cold straightening is the same as that for the first pass.
[0068] (5) The adjustment roll gap value for the fourth pass of cold straightening is -0.5mm, and the other parameter values are set the same as the parameter model for the second pass straightening.
[0069] (6) The fifth pass of cold straightening is flat roller straightening. The model selected is severe head and tail lifting. The height of the exit feed roller of the parallel roller straightening is -1.8mm.
[0070] Example 2
[0071] Steel grade S30408+Q345R, dimensions are 11mm*2000mm*7900mm
[0072] Specifically, the steps include the following:
[0073] (1) Based on the thickness of the composite board being 11mm, adjust the straightening speed to 0.5m / s.
[0074] (2) The tilting of the first pass of cold straightening is set to +2mm, and the roll gap value is set to -1.6mm.
[0075] (3) In order to eliminate the transverse arc of the steel plate, the second pass of cold straightening is based on the straightening effect of the first pass. The roll gap is not adjusted, the model is selected as negative bending roll weight, and the tilt adjustment is 0.
[0076] (4) The parameter model for the third pass of cold straightening is the same as that for the first pass.
[0077] (5) The parameters of the fourth pass and the second pass of cold straightening are the same.
[0078] (6) The fifth pass of cold straightening is flat roller straightening. The model selected is severe head and tail lifting. The exit feed roller height of the parallel roller straightening is -1.6mm.
[0079] Example 3
[0080] Steel grade 06Cr19Ni10+Q245R, dimensions are 13mm*3030mm*8880mm
[0081] Specifically, the steps include the following:
[0082] (1) Based on the thickness of the composite board being 13mm, adjust the straightening speed to 0.5m / s.
[0083] (2) The tilting of the first pass of cold straightening is set to +2.5mm, and the roll gap value is set to -1.8mm.
[0084] (3) In order to eliminate the transverse arc of the steel plate, the second pass of cold straightening is based on the straightening effect of the first pass. The roll gap is not adjusted, the model is selected as negative bending roll weight, and the tilt adjustment is 0.
[0085] (4) The parameter model for the third pass of cold straightening is the same as that for the first pass.
[0086] (5) The parameters of the fourth pass and the second pass of cold straightening are the same.
[0087] (6) The fifth pass of cold straightening is flat roller straightening. The model selected is severe head and tail lifting. The exit feed roller height of the parallel roller straightening is -1.6mm.
[0088] Comparative Example 1
[0089] Steel grade 316L+Q370qE, dimensions are 19mm*3000mm*7200mm
[0090] Specifically, the steps include the following:
[0091] (1) Based on the thickness of the composite board being 19mm, adjust the straightening speed to 0.4m / s.
[0092] (2) The tilting of the first pass of cold straightening is set to +3mm, and the roll gap value is not adjusted.
[0093] (3) The roll gap value of the second pass of cold straightening is adjusted to -1.4mm.
[0094] (4) The parameter models for the third pass and the second pass of cold straightening are the same.
[0095] (5) In order to eliminate the transverse arc of the steel plate, the roll gap value is set to -1.0mm and the tilt adjustment is set to 0 for the fourth pass of cold straightening based on the straightening effect of the third pass.
[0096] (6) The parameter model for the fifth pass of cold straightening is the same as that for the first pass.
[0097] (7) The sixth pass of cold straightening is flat roller straightening, and the roller gap value is adjusted to -0.6mm.
[0098] (8) The seventh pass of cold straightening is flat roller straightening, and the exit feed roller height of the parallel roller straightening is -1.6mm.
[0099] Table 1. Plate Shape Control Results
[0100] Serial Number Plate shape control results Example 1 High flatness Example 2 High flatness Example 3 High flatness Comparative Example 1 Low flatness
[0101] The composite plate cold straightening method of this application embodiment is simple in procedure and successfully straightens the composite plate to obtain a steel plate with high flatness. Specifically, please refer to the schematic diagram of the steel plate before straightening provided in Embodiment 1. Figure 2 () and a schematic diagram of the straightened steel plate provided in Example 1 () Figure 3 Please refer to the schematic diagram of the steel plate before straightening provided in Example 2. Figure 4 () and a schematic diagram of the straightened steel plate provided in Example 2 () Figure 5 Please refer to the schematic diagram of the steel plate before straightening provided in Example 3. Figure 6 ) and a schematic diagram of the straightened steel plate provided in Example 32 ( Figure 7 The comparative example did not use the method of the embodiments of this application, and the steps were complicated, resulting in the failure of steel plate straightening. Specifically, please refer to the schematic diagram of the steel plate before straightening provided in Comparative Example 1. Figure 8 ) and a schematic diagram of the straightened steel plate provided in Comparative Example 1 ( Figure 9 ).
[0102] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.
Claims
1. A cold straightening method for composite plates, characterized in that, The method includes: Determine the thickness of the composite board, and the thickness of the composite board is 10 - 20 mm; Set the straightening speed according to the thickness of the composite board; when the thickness of the composite board is 10 - 15 mm, the set straightening speed is ≤ 0.5 m / s; when the thickness of the composite board is 15 - 20 mm, the set straightening speed is ≤ 0.4 m / s; Set the straightening parameter model in five passes; including: In the first-pass straightening, set the tilting of the tilting rolls and the roll gap height; where The tilting of the tilting rolls is 2 - 5 mm, and the roll gap height is -1.6 - -2 mm; In the second-pass straightening, select the model as negative bending roll heavy, and set the tilting of the tilting rolls; where the tilting of the tilting rolls is 0 mm; The straightening parameter model in the third pass is the same as the straightening process parameters in the first pass; The straightening parameter model in the fourth pass is the same as the straightening process parameters in the second pass; In the fifth-pass straightening, use parallel roll straightening, and select the model as severe head and tail warping and control the height of the outlet guiding roll for the parallel roll straightening; where the height of the outlet guiding roll is -1.5 - -2 mm.