Method for controlling straightness of high-temperature alloy cold-rolled strip

Abstract

The invention belongs to the technical field of preparation of high-temperature alloy cold-rolled strips. The invention discloses a method for controlling the straightness of a high-temperature alloy cold-rolled strip, which is used for improving and improving the straightness and the plate shape quality of a finished strip, and comprises the following steps: on the basis of the existing process, by adding an original strip blank flattening procedure and detecting the straightness of a strip in an intermediate process and the finished strip, according to different straightness detection results, determining the straightness of the strip according to different straightness detection results; and meanwhile, according to the thickness of the high-temperature alloy cold-rolled strip, different finished product finish rolling technological parameters are optimally configured, and the multiple technological processes have a synergistic effect, so that the high-temperature alloy strip has good straightness and plate shape, the structure performance is ideal to control, and the production efficiency is improved. And the product quality and the qualified rate of the high-temperature alloy strip are improved, the production cost is reduced, and benefits are remarkable.

Description

Technical Field

[0001] The invention belongs to the technical field of high-temperature alloy cold-rolled strip preparation and relates to a method for controlling the flatness of a high-temperature alloy cold-rolled strip. Background Art

[0002] In the aerospace industry, high-temperature alloy cold-rolled strip is a key material for the production of sheet metal stamping parts. Its flatness significantly impacts the subsequent manufacturing and performance of sheet metal parts. High-temperature alloy strip with excellent flatness can enhance and improve its stamping performance, facilitating the forming, manufacturing, and quality improvement of sheet metal parts. High-temperature alloy cold-rolled strip is typically delivered after heat treatment, such as in the annealing or solid solution state. Currently, high-temperature alloy strips such as GH738, GH625, GH3536, GH605, GH4214, and GH4145 are the primary materials for the manufacture of sheet metal parts, including sealing rings, seals, sealing plates, and thermal insulation sleeves, used in aviation and aerospace power systems.

[0003] Due to the cold rolling process, the product has a large width-to-thickness ratio. This is especially true for wide, ultra-thin strip rolling, where the ratio can even reach over 10,000. This leads to prominent issues with the cold-rolled strip's flatness, manifested in undesirable characteristics such as wave-breaking bends, wrinkle bends, edge waves, center waves, and curvature. High-temperature alloy strips have a high resistance to cold-rolled deformation, and the cold work hardening phenomenon associated with the cold deformation process further enhances the strip's resistance to cold-rolled deformation. The flatness issues that arise during the rolling process of high-temperature alloy cold-rolled strips are particularly prominent, directly impacting their performance and affecting the continuity and stability of the production process. In actual production, high-temperature alloy strip shape control refers to flatness control. Horizontal warpage is often used to describe flatness more intuitively. Flatness testing involves measuring the maximum edge wave height of the horizontal warping of the strip.

[0004] However, existing technologies for processing high-temperature alloy strip lack effective means for controlling flatness. The traditional method involves applying stretch bend straightening (or simply stretch straightening) to the finished strip at the end of the process. This single method for improving the flatness of high-temperature alloy strip after rolling is not ideal. This is because the production of high-temperature alloy strip involves numerous process steps, from billet production to finished product. Currently, the main process flow for producing high-temperature alloy strip is: billet preparation → welding → cold rolling → intermediate heat treatment → cold rolling → finished product heat treatment → stretch straightening → final inspection. Each of these multiple production steps affects the flatness of the high-temperature alloy strip. First, imperfect flatness and flatness of the original billet can be passed on to the finished strip. Therefore, a lack of control over the flatness of the original billet is inappropriate. Secondly, it should be noted that cold processing of strips is a process that organically combines cold rolling plastic deformation forming with multi-cycle heat treatment. In actual production, there is a lack of optimization research on the cold rolling process and heat treatment process that affect flatness, and a lack of research on the coordinated control correlation between the flatness of high-temperature alloy strips after cold rolling and the flatness after heat treatment. Summary of the Invention

[0005] The purpose of the present invention is to design a method for controlling the flatness of a high-temperature alloy cold-rolled strip. From the perspective of the entire process, a method is proposed to thoroughly and effectively improve the flatness of the high-temperature alloy strip and effectively control the strip shape, so as to solve the current problems in the production of high-temperature alloy strips and ensure their subsequent high usability and manufacturing quality of sheet metal parts.

[0006] To solve this technical problem, the technical solution of the present invention is: A method for controlling the flatness of high-temperature alloy cold-rolled strip is provided. The finished cold-rolled strip has a thickness range of 0.05-0.80 mm and a width range of 100-600 mm. The control process is as follows: original strip → flattening → welding into coils → cold rolling → flatness detection → intermediate heat treatment → finished product finish rolling → flatness detection → finished product heat treatment → flatness detection → tension leveling → final inspection.

[0007] The intermediate heat treatment process parameters are: when d When the diameter is ≥25mm / m, control the inlet tension: 20-25KN, the outlet tension: 30-35KN, the heat treatment temperature: 1050-1120℃, and the tape speed: 10-15 m / min; When 15mm / m≤ d When the diameter is less than 25mm / m, control the inlet tension: 15-20KN, the outlet tension: 25-30KN, the heat treatment temperature: 1050-1100℃, and the tape speed: 10-15 m / min; When 5mm / m≤ dWhen the thickness is less than 15 mm / m, control the inlet tension to 10-15 kN, the outlet tension to 20-25 kN, the heat treatment temperature to 1020-1080 °C, and the tape speed to 10-15 m / min. when d When the thickness is less than 5mm / m, control the inlet tension: 8~10KN, the outlet tension: 10~20KN, the heat treatment temperature: 1000~1080℃, the tape speed: 10~15m / min, in, d It is the horizontal warpage of the intermediate strip after billet cold rolling.

[0008] The finished product is finished on a twenty-high cold rolling mill, using flexible multi-pass gradient small strain cumulative deformation rolling to control the shape and thickness of the finished strip. The specific process parameters are: Cold rolling is carried out in 5-9 passes, with the maximum deformation of each pass being 15%≤≤25%, the rolling force being 400~1000KN, and the inlet tension and outlet tension being 20~80KN respectively.

[0009] The finished product heat treatment process parameters are: when d When the thickness is ≥20mm / m, control the inlet tension: 20-25KN, the outlet tension: 25-30KN, the heat treatment temperature: 1000-1100℃, and the tape speed: 15-25 m / min; When 10mm / m≤ d When the thickness is less than 20 mm / m, control the inlet tension to 15-20 kN, the outlet tension to 20-25 kN, the heat treatment temperature to 1000-1080°C, and the tape speed to 15-25 m / min. When 5mm / m≤ d When the diameter is less than 10mm / m, control the inlet tension: 10-15KN, the outlet tension: 15-20KN, the heat treatment temperature: 980-1050℃, and the tape speed: 15-25m / min; when d When the thickness is less than 5mm / m, control the inlet tension: 8~10KN, the outlet tension: 10~15KN, the heat treatment temperature: 950~1050℃, the tape speed: 15~25m / min, in, d It is the horizontal warping of the finished strip after finish rolling.

[0010] The tension leveling process parameters are: when d When the diameter is ≥15mm / m, the inlet tension is 10-15KN, the outlet tension is 10-20KN, and the straightening speed is 1-3 m / min. When 8mm / m≤ dWhen the diameter is less than 15mm / m, the inlet tension is 10-12KN, the outlet tension is 10-15KN, and the straightening speed is 3-6 m / min. When 5mm / m≤ d When the diameter is less than 8mm / m, the inlet tension is 5-10KN, the outlet tension is 8-10KN, and the straightening speed is 4-7m / min. when d When the strip thickness is less than 5mm / m, it is not necessary to straighten the finished strip. in, d It is the horizontal warpage of the finished strip after heat treatment.

[0011] The main process parameters of the leveling are: reduction: 0.05-0.5 mm, and leveling speed: 1-25 m / min.

[0012] The finished product finishing rolling process parameters are: For strips with a thickness of 0.50mm<T≤0.80mm, cold rolling is performed in 5-7 passes. The deformation of each pass is controlled according to a gradient decreasing rule. The maximum deformation of each pass is ≤25%. The rolling force is 600-1000KN, and the inlet and outlet tensions are 50-80KN respectively. For strips with a thickness of 0.30mm<T≤0.50mm, cold rolling is performed in 6-8 passes. The deformation of each pass is controlled according to a gradient decreasing rule. The maximum deformation of each pass is ≤20%. The rolling force is 500-800KN, and the inlet and outlet tensions are 40-70KN respectively. For strips with a thickness of 0.05mm≤T<0.30mm, cold rolling is carried out in 7-9 passes. The deformation of each pass is controlled according to the gradient decreasing rule. The maximum deformation of each pass is ≤15%. The rolling force is 400-700KN, and the entrance tension and exit tension are 20-50KN respectively. Where T is the thickness of the finished strip.

[0013] The straightness detection tooling includes a platform, a support frame, a slide rail, a laser displacement sensor, a display, and a wire.

[0014] The platform is a steel platform or a marble platform, which is stably supported by the four support frames. The slide rail is fixed at one end of the platform. The laser displacement sensor is arranged on the slide rail and can slide freely along the slide rail track; the display is placed on the platform, on the outer edge of the slide rail, and the display and the laser displacement sensor are connected through the wire.

[0015] The method of using the flatness detection tool is as follows: a test strip of 1m in length cut from a high-temperature alloy intermediate strip or a finished strip is freely placed in the middle of the platform, so that the rolling direction of the test strip is parallel to the direction of the slide rail. Then, the laser displacement sensor is manually slid along the slide rail to scan the test strip, and the three-dimensional profile and horizontal height change of the strip are measured. Finally, the horizontal warpage of the tested strip is read out on the display. d .

[0016] The leveling is to roll a single strip on a multi-roller leveler to level it, thereby improving the flatness of the original strip. The straightness test is to place a certain length of test strip cut from the intermediate strip and the finished strip on the testing tool to measure the horizontal warpage of the test strip; The intermediate heat treatment is a bright heat treatment under continuous tension, which not only reduces the cold working hardening effect of the material and restores the process plasticity, but also improves the straightness of the intermediate strip. The finished product heat treatment is a bright heat treatment under continuous tension, which not only gives the finished strip the final structural properties, but also improves the straightness of the finished strip. The said straightening refers to the continuous stretching, bending and straightening of the finished strip on a multi-roller straightening machine, which further eliminates the plate defects of the finished strip such as wave bending, wrinkle bending, edge wave, middle wave, and drifting, and improves and improves the straightness of the finished strip.

[0017] The beneficial effects of the present invention are: The method for controlling the flatness of high-temperature alloy cold-rolled strip of the present invention adopts full-process control measures from the original billet to the finished strip, effectively improving and enhancing the flatness of the high-temperature alloy strip, obtaining a high-quality strip product, and solving the problems of poor flatness of high-temperature alloy strip, lax product quality control, poor batch stability, high scrap rate, and low pass rate in the prior art. It has the following beneficial effects: (1) The present invention adopts a variety of process measures to control the flatness of the high-temperature alloy cold-rolled strip throughout the entire process, especially to level the original strip used, thereby controlling the influence on the flatness of the strip from the source.

[0018] (2) Based on the existing process, the present invention adds flatness detection of intermediate process strips and finished product strips. According to different flatness detection results, it can effectively guide the optimization and adjustment of intermediate heat treatment, finished product heat treatment, straightening and other processes, configure corresponding optimized process parameters, and effectively improve the control effect of the flatness of high-temperature alloy strips. At the same time, the high-temperature alloy strips obtain ideal structure and performance.

[0019] (3) The present invention optimizes and configures different finished product finishing rolling process parameters according to the thickness of the high-temperature alloy strip, and adopts flexible multi-pass gradient small strain cumulative deformation rolling. In the same rolling process, it can produce smaller strain and relatively stable rolling force, keeping the strip uniformly deformed during the rolling process, suppressing and reducing uneven deformation and the probability of occurrence, which is beneficial to improving the flatness of the strip and improving the plate shape.

[0020] (4) The present invention is a comprehensive control of the existing high-temperature alloy strip production process, which provides a new and effective method for producing high-quality high-temperature alloy strips. The horizontal warpage of the high-temperature alloy cold-rolled strip produced by the present invention is d <3mm / m, with good flatness and plate shape, which improves the product quality and qualified rate of high-temperature alloy strips, reduces production costs, and significantly improves the effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] To more clearly illustrate the technical solutions implemented in the present invention, the following briefly explains the drawings required for use in the examples of the present invention. It is obvious that the drawings described below are only some embodiments of the present invention, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0022] Figure 1 Schematic diagram of the structure of the flatness detection tool according to the present invention.

[0023] Figure 2 Schematic diagram of detecting the maximum height of horizontal warping in an embodiment of the present invention.

[0024] Figure 3 This is another schematic diagram of detecting the maximum height of horizontal warping in an embodiment of the present invention.

[0025] In the figure: 1 - platform, 2 - support frame, 3 - slide rail, 4 - laser displacement sensor, 5 - display, 6 - wire, 7 - test tape. DETAILED DESCRIPTION

[0026] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] The features of various aspects of the embodiments of the present invention will be described in detail below. In the detailed description below, many specific details are provided to provide a comprehensive understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be implemented without these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is not limited to any specific configuration and method provided below, but rather encompasses all product structures, methods, and any improvements, replacements, etc., covered without departing from the spirit of the present invention.

[0028] In the various drawings and the following description, well-known structures and techniques are not shown to avoid unnecessarily obscuring the present invention.

[0029] Example 1: The invention discloses a method for controlling the flatness of a high-temperature alloy cold-rolled strip. The method is targeted at high-temperature alloy cold-rolled strips with a finished product specification range of 0.05-0.80 mm in thickness and 100-600 mm in width.

[0030] The complete control process of the present invention is: original strip → leveling → welding into coils → cold rolling → flatness detection → intermediate heat treatment → finished product finishing rolling → flatness detection → finished product heat treatment → flatness detection → straightening → final inspection.

[0031] The above-mentioned leveling is to roll a single strip on a multi-roller leveler to level it, thereby improving the flatness of the original strip. The above-mentioned straightness test is to place a certain length of test strip cut from the intermediate strip and the finished strip on the testing tool to measure the horizontal warpage of the test strip; The above-mentioned intermediate heat treatment refers to the bright heat treatment of continuous strip under tension, which not only reduces the cold working hardening effect of the material and restores the process plasticity, but also improves the straightness of the intermediate strip. The finished product finishing rolling is carried out on a twenty-high cold rolling mill, using flexible multi-pass gradient small strain cumulative deformation rolling to control the shape and thickness of the finished strip; The above-mentioned finished product heat treatment refers to the bright heat treatment of continuous belt conveying with controlled tension, which not only gives the finished strip the final structural properties, but also improves the flatness of the finished strip. The above-mentioned straightening refers to the continuous stretching, bending and straightening of the finished strip on a multi-roller straightening machine, which further eliminates the plate defects of the finished strip such as wave bend, wrinkle bend, edge wave, middle wave, and drift, and improves and improves the straightness of the finished strip.

[0032] In this embodiment, the grade of the high-temperature alloy cold-rolled strip used is GH738, the finished cold-rolled strip has a thickness of 0.25 mm, and the main process parameters for strip leveling are: reduction: 0.1 mm, and leveling speed: 5 m / min.

[0033] like Figure 1 As shown, the cold-rolled strip flatness detection tool of this embodiment includes a platform 1, a support frame 2, a slide rail 3, a laser displacement sensor 4, a display 5, and a wire 6.

[0034] In this example, the measured horizontal warpage of the intermediate strip after slab cold rolling was 26 mm / m. The main process parameters for the intermediate heat treatment were: inlet tension: 25 kN, outlet tension: 35 kN, heat treatment temperature: 1120°C, and strip speed: 15 m / min. The main process parameters for the finished product finish rolling were: cold rolling in nine passes, with the deformation per pass controlled by a gradient-decreasing rule, a maximum deformation per pass of 15%, a rolling force of 700 kN, and inlet and outlet tensions of 40 kN, respectively.

[0035] In this embodiment, the horizontal curvature of the finished strip after finish rolling was measured to be 16 mm / m. The main process parameters for the finished heat treatment were: inlet tension: 19 kN, outlet tension: 24 kN, heat treatment temperature: 1080°C, and strip speed: 18 m / min.

[0036] In this embodiment, the horizontal warpage of the finished strip after heat treatment was measured to be 9.5 mm / m. The main process parameters for straightening are: inlet tension: 10 kN, outlet tension: 15 kN, and straightening speed: 4 m / min.

[0037] like Figure 1 As shown, the cold-rolled strip flatness detection tooling of this embodiment, the platform 1 is a steel platform or a marble platform, which is stably supported by the four support frames 2, the slide rail 3 is fixed at one end of the platform 1, and the laser displacement sensor 4 is arranged on the slide rail 3 and can slide freely along the track of the slide rail 3; the display 5 is placed on the platform 1 and on the outer edge of the slide rail 3, and the display 5 is connected to the laser displacement sensor 4 through the wire 6.

[0038] The method of using the strip flatness detection tool is as follows: a test strip with a length of 1m cut from a high-temperature alloy intermediate strip, a finished strip or the like is freely placed in the middle of the platform so that the rolling direction of the test strip is parallel to the direction of the slide rail. Then, the laser displacement sensor is manually slid along the slide rail to scan the test strip, and the three-dimensional profile and horizontal height change of the strip are measured. Finally, the horizontal warpage of the tested strip is read out on the display. d .

[0039] In this embodiment, the laser displacement sensor used is a commonly used instrument in this field, and no special requirements are made on the model; the display used is a commonly used device in this field, and no special requirements are made on the model.

[0040] After random sampling and final inspection, the horizontal warpage test results of the finished products are shown in Table 1.

[0041] Example 2: According to another preferred embodiment of the method for controlling the flatness of a high-temperature alloy cold-rolled strip of the present invention, the control process, the instruments and equipment used, the principle, the beneficial effects, etc. are substantially the same as those of the first embodiment, except that: In this embodiment, the grade of the high-temperature alloy cold-rolled strip used is GH625, the finished cold-rolled strip has a thickness of 0.5 mm, and the main process parameters for strip leveling are: reduction: 0.3 mm, and leveling speed: 10 m / min.

[0042] In this example, the measured horizontal warpage of the intermediate strip after slab cold rolling was 22 mm / m. The main process parameters for the intermediate heat treatment were: inlet tension: 18 kN, outlet tension: 27 kN, heat treatment temperature: 1100°C, and strip speed: 12 m / min. The main process parameters for the finished product finish rolling were: cold rolling in seven passes, with the deformation per pass controlled by a gradient-decreasing rule, a maximum deformation per pass of 20%, a rolling force of 800 kN, and inlet and outlet tensions of 80 kN, respectively.

[0043] In this embodiment, the horizontal curvature of the finished strip after finish rolling was measured to be 9.5 mm / m. The main process parameters for the finished heat treatment were: inlet tension: 15 kN, outlet tension: 19 kN, heat treatment temperature: 1050°C, and strip speed: 15 m / min.

[0044] In this embodiment, the horizontal warpage of the finished strip after heat treatment was measured to be 7.1 mm / m. The main process parameters for straightening are: inlet tension: 6 kN, outlet tension: 9 kN, and straightening speed: 5 m / min.

[0045] After random sampling and final inspection, the horizontal warpage test results of the finished products are shown in Table 1.

[0046] Example 3: According to another preferred embodiment of the method for controlling the flatness of a high-temperature alloy cold-rolled strip of the present invention, the control process, the instruments and equipment used, the principle, the beneficial effects, etc. are substantially the same as those of the first embodiment, except that: In this embodiment, the grade of the high-temperature alloy cold-rolled strip used is GH3536, the finished cold-rolled strip has a thickness of 0.10 mm, and the main process parameters for strip leveling are reduction: 0.12 mm, and leveling speed: 13 m / min.

[0047] In this example, the measured horizontal warpage of the intermediate strip after slab cold rolling was 14 mm / m. The main process parameters for the intermediate heat treatment were: inlet tension: 13 kN, outlet tension: 22 kN, heat treatment temperature: 1080°C, and strip speed: 10 m / min. The main process parameters for the finished product finish rolling were: cold rolling in eight passes, with the deformation per pass controlled by a gradient-decreasing rule, a maximum deformation per pass of 13%, a rolling force of 600 kN, and inlet and outlet tensions of 50 kN, respectively.

[0048] In this embodiment, the horizontal curvature of the finished strip after finish rolling was measured to be 8.1 mm / m. The main process parameters for the finished heat treatment were: inlet tension: 12 kN, outlet tension: 18 kN, heat treatment temperature: 1030°C, and strip speed: 17 m / min.

[0049] In this embodiment, the horizontal warpage of the finished strip after heat treatment was measured to be 6.5 mm / m. The main process parameters for straightening are: inlet tension: 5 kN, outlet tension: 8 kN, and straightening speed: 7 m / min.

[0050] After random sampling and final inspection, the horizontal warpage test results of the finished products are shown in Table 1.

[0051] Comparative Example 1: The high-temperature alloy cold-rolled strip used in Comparative Example 1 is GH738, and the finished cold-rolled strip has a thickness of 0.25 mm. The process flow, instruments, and equipment used for controlling the flatness of the GH738 alloy 0.25 mm thick strip are the same as those in Example 1. The differences are: In this comparative example, the measured horizontal warpage of the intermediate strip after slab cold rolling was 26 mm / m, the measured horizontal warpage of the finished strip after finish rolling was 23.6 mm / m, and the measured horizontal warpage of the finished strip after heat treatment was 14.2 mm / m. In this comparative example, the process parameters adopted for the intermediate heat treatment are shown in Table 2.

[0052] After random sampling and final inspection, the horizontal warpage test results of the finished products are listed in Table 1.

[0053] Comparative Example 2: The high-temperature alloy cold-rolled strip used in Comparative Example 2 is GH625, and the finished cold-rolled strip has a thickness of 0.5 mm. The process flow, instruments, and equipment used for controlling the flatness of the GH625 alloy 0.5 mm thick strip are the same as those in Example 2. The differences are: In this comparative example, the measured horizontal warpage of the intermediate strip after slab cold rolling was 22 mm / m, the measured horizontal warpage of the finished strip after finish rolling was 9.8 mm / m, and the measured horizontal warpage of the finished strip after heat treatment was 7.9 mm / m. In this comparative example, the process parameters adopted for the heat treatment of the finished product are shown in Table 2.

[0054] After random sampling and final inspection, the horizontal warpage test results of the finished products are listed in Table 1.

[0055] Comparative Example 3: The high-temperature alloy cold-rolled strip used in Comparative Example 3 was GH3536, and the finished cold-rolled strip had a thickness of 0.10 mm. The process flow, instruments, and equipment used for controlling the flatness of the 0.10 mm thick GH3536 alloy strip were the same as those in Example 3. The differences were that in this comparative example, the horizontal warpage of the intermediate strip after cogging cold rolling was measured to be 14 mm / m, the horizontal warpage of the finished strip after finish rolling was measured to be 9.8 mm / m, and the horizontal warpage of the finished strip after heat treatment was measured to be 7.8 mm / m. In this comparative example, the process parameters used for intermediate heat treatment, finished product heat treatment and tension leveling are shown in Table 2.

[0056] After random sampling and final inspection, the horizontal warpage test results of the finished products are listed in Table 1.

[0057] Table 1

[0058] Table 2

[0059] As can be seen from Table 1, the horizontal warpage of the high-temperature alloy strips in Examples 1-3 is d The lower the horizontal warpage, the better the flatness of the strip. Conversely, the higher the horizontal warpage, the worse the flatness of the strip. d <3mm / m, the horizontal warping value of the strip is low, that is, the high-temperature alloy cold-rolled strip produced by the present invention has good flatness and plate shape.

[0060] As can be seen from Table 2, the intermediate heat treatment process parameters used in Comparative Example 1 are outside the process parameter range of the present invention. Combined with Table 1, it can be seen that the horizontal warpage of the strip in Comparative Example 1 is higher than that of the strip of the same alloy and thickness in Example 1, indicating that the strip in Comparative Example 1 has poor flatness and poor flatness.

[0061] As can be seen from Table 2, the finished product heat treatment process parameters used in Comparative Example 2 are outside the process parameter range of the present invention. Combined with Table 1, it can be seen that the horizontal warpage of the strip in Comparative Example 2 is higher than that of the strip of the same alloy and thickness in Example 2, indicating that the strip in Comparative Example 2 has poorer flatness and shape quality.

[0062] As can be seen from Table 2, the process parameters for intermediate heat treatment, finished product heat treatment, and straightening in Comparative Example 3 differ from those required by the present invention. Combined with Table 1, it can be seen that the horizontal warpage of the strip in Comparative Example 3 is the highest, indicating that the strip in Comparative Example 3 has the worst flatness and shape quality.

[0063] The technical solution of the present invention involves many parameters, and the synergistic effect between the various parameters needs to be comprehensively considered. After a large number of experiments, especially the synergistic control of the process parameters of the intermediate heat treatment, finished product finishing rolling, finished product heat treatment, finished product straightening and other steps, the beneficial effects and significant progress of the present invention can be obtained.

[0064] The method for controlling the flatness of the high-temperature alloy cold-rolled strip of this embodiment adopts a combination of various process measures to control the flatness of the high-temperature alloy cold-rolled strip throughout the entire process, especially to straighten the original strip used, so as to control the influence on the flatness of the strip from the source. According to the thickness of the high-temperature alloy strip, different finished product finishing process parameters are optimized and configured, and flexible multi-pass gradient small strain cumulative deformation rolling is adopted. In the same rolling process, smaller strain can be generated, and the rolling force is relatively stable, so that the strip is kept uniformly deformed during the rolling process, which suppresses and reduces uneven deformation and the probability of occurrence, and is conducive to improving the flatness of the strip and improving the plate shape. The horizontal curvature of the high-temperature alloy cold-rolled strip produced by the present invention is d <3mm / m, with good flatness and plate shape, improving the product quality and pass rate of high-temperature alloy strips.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should all be covered by the scope of protection of the present invention.

Claims

1. A method for controlling the flatness of a high-temperature alloy cold-rolled strip, characterized in that: The specifications of the finished cold-rolled strip range from 0.05-0.80mm in thickness and 100-600mm in width. The control process flow is: original strip → leveling → welding into coils → cold rolling → flatness detection → intermediate heat treatment → finished product finishing rolling → flatness detection → finished product heat treatment → flatness detection → tension leveling → final inspection.

2. The control method according to claim 1, characterized in that: The intermediate heat treatment process parameters are: when δ When the diameter is ≥25mm / m, control the inlet tension: 20-25KN, the outlet tension: 30-35KN, the heat treatment temperature: 1050-1120℃, and the tape speed: 10-15 m / min; When 15mm / m≤ δ When the diameter is less than 25mm / m, control the inlet tension: 15-20KN, the outlet tension: 25-30KN, the heat treatment temperature: 1050-1100℃, and the tape speed: 10-15 m / min; When 5mm / m≤ δ When the thickness is less than 15 mm / m, control the inlet tension to 10-15 kN, the outlet tension to 20-25 kN, the heat treatment temperature to 1020-1080 °C, and the tape speed to 10-15 m / min. when δ When the thickness is less than 5mm / m, control the inlet tension: 8~10KN, the outlet tension: 10~20KN, the heat treatment temperature: 1000~1080℃, the tape speed: 10~15m / min, in, δ It is the horizontal warpage of the intermediate strip after billet cold rolling.

3. The control method according to claim 1, wherein: The finished product is finished on a cold rolling mill, using flexible multi-pass gradient small strain cumulative deformation rolling to control the shape and thickness of the finished strip. The specific process parameters are: Cold rolling is carried out in 5-9 passes, with the maximum deformation of each pass being 15%≤≤25%, the rolling force being 400~1000KN, and the inlet tension and outlet tension being 20~80KN respectively.

4. The control method according to claim 1, wherein: The finished product heat treatment process parameters are: when δ When the thickness is ≥20mm / m, control the inlet tension: 20-25KN, the outlet tension: 25-30KN, the heat treatment temperature: 1000-1100℃, and the tape speed: 15-25 m / min; When 10mm / m≤ δ When the thickness is less than 20 mm / m, control the inlet tension to 15-20 kN, the outlet tension to 20-25 kN, the heat treatment temperature to 1000-1080°C, and the tape speed to 15-25 m / min. When 5mm / m≤ δ When the diameter is less than 10mm / m, control the inlet tension: 10-15KN, the outlet tension: 15-20KN, the heat treatment temperature: 980-1050℃, and the tape speed: 15-25m / min; when δ When the thickness is less than 5mm / m, control the inlet tension: 8~10KN, the outlet tension: 10~15KN, the heat treatment temperature: 950~1050℃, the tape speed: 15~25m / min, in, δ It is the horizontal warping of the finished strip after finish rolling.

5. The control method according to claim 1, characterized in that: The tension leveling process parameters are: when δ When the diameter is ≥15mm / m, the inlet tension is 10-15KN, the outlet tension is 10-20KN, and the straightening speed is 1-3 m / min. When 8mm / m≤ δ When the diameter is less than 15mm / m, the inlet tension is 10-12KN, the outlet tension is 10-15KN, and the straightening speed is 3-6 m / min. When 5mm / m≤ δ When the diameter is less than 8mm / m, the inlet tension is 5-10KN, the outlet tension is 8-10KN, and the straightening speed is 4-7 m / min. when δ When the strip thickness is less than 5mm / m, the finished strip will not be straightened. in, δ It is the horizontal warpage of the finished strip after heat treatment.

6. The control method according to claim 1, characterized in that: The main process parameters of the leveling are: reduction: 0.05-0.5 mm, and leveling speed: 1-25 m / min.

7. The control method according to claim 3, characterized in that: The finished product finishing rolling process parameters are: For strips with a thickness of 0.50mm<T≤0.80mm, cold rolling is performed in 5-7 passes. The deformation of each pass is controlled according to a gradient decreasing rule. The maximum deformation of each pass is ≤25%. The rolling force is 600-1000KN, and the inlet and outlet tensions are 50-80KN respectively. For strips with a thickness of 0.30mm<T≤0.50mm, cold rolling is performed in 6-8 passes. The deformation of each pass is controlled according to a gradient decreasing rule. The maximum deformation of each pass is ≤20%. The rolling force is 500-800KN, and the inlet and outlet tensions are 40-70KN respectively. For strips with a thickness of 0.05mm≤T<0.30mm, cold rolling is carried out in 7-9 passes. The deformation of each pass is controlled according to the gradient decreasing rule. The maximum deformation of each pass is ≤15%. The rolling force is 400-700KN, and the entrance tension and exit tension are 20-50KN respectively. Where T is the thickness of the finished strip.

8. The control method according to claim 1, characterized in that: The straightness detection tooling includes a platform, a support frame, a slide rail, a laser displacement sensor, a display, and a wire.

9. The control method according to claim 8, characterized in that: The platform is stably supported by the support frame, the slide rail is fixed at one end of the platform, the laser displacement sensor is arranged on the slide rail and can slide freely along the slide rail track; the display is placed on the platform, on the outer edge of the slide rail, and the display and the laser displacement sensor are connected through the wire.

10. The control method according to claim 8, characterized in that: The method of using the flatness detection tool is as follows: a test strip cut from a high-temperature alloy intermediate strip or a finished strip is freely placed in the middle position on the platform, so that the rolling direction of the test strip is parallel to the direction of the slide rail, and then the laser displacement sensor is slowly slid along the slide rail to scan the test strip, and the three-dimensional profile and horizontal height change of the strip are measured. Finally, the horizontal warpage of the tested strip is read out on the display. δ .

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