A rolling method for 0.1mm thick ultra-flat and ultra-hard precision stainless steel sheets

Abstract

This invention discloses a rolling method for 0.1mm thick ultra-flat and ultra-hard precision stainless steel sheets, including: preset rolling parameters, production preparation, rolling, and post-rolling cooling. The preset rolling speeds are: 100-120 m / min for the first pass, 90-100 m / min for the final pass, and 110-120 m / min for intermediate passes; the preset rolling pressures are: 740-800 KN for the first pass, 950-1000 KN for the second pass, and [missing information - likely related to the final pass]. The rolling pressure is 700-760 kN, with intermediate passes at 700-800 kN; the rolling oil temperature throughout the rolling process is 35-40℃; the preset plate profile curve is set as follows: slope value -20-40, center waviness value 80, and edge waviness value 20; the rolls are M42 rolls with a diameter of 38-40 mm; the roughness of the rolls used in the finishing pass and the pass preceding the finishing pass is 0.4-0.5 μm, and the roughness of the rolls used in the first pass and the remaining intermediate passes is 0.5-0.6 μm. This invention can produce 0.1 mm ultra-flat and ultra-hard precision stainless steel sheets with qualified and uniform surface roughness and flatness, small thickness tolerance fluctuations, stable surface quality, and effectively improved rolling accuracy, product qualification rate, and production efficiency.

Description

Technical Field

[0001] This invention belongs to the field of stainless steel sheet rolling technology, specifically relating to a rolling method for 0.1mm thick ultra-flat and ultra-hard precision stainless steel sheets. Background Technology

[0002] In metal processing, precise rolling of metal materials is necessary to ensure product quality and performance. Currently, commonly used rolling equipment includes the Sendzimir 20-roll mill and the SUNDWIG four-column 20-roll mill. However, existing Sendzimir 20-roll mills have certain limitations when rolling 0.1mm thick ultra-flat, ultra-hard precision stainless steel sheets, such as low rolling accuracy and low rolling efficiency.

[0003] During the rolling process of 0.1mm ultra-flat and ultra-hard precision stainless steel sheets, the relatively high rolling tension and pressure can easily lead to problems such as strip breakage, edge waviness, quarter-wave formation, and surface roller marks. Furthermore, using conventional D2 material work rolls during rolling makes it easy for oxides to adhere to the roll surface, resulting in uneven surface roughness, uneven rolling texture, and uneven color, including transverse and longitudinal color differences. Additionally, the thin thickness and high hardness of 0.1mm ultra-flat and ultra-hard precision stainless steel sheets make production process control extremely difficult.

[0004] Therefore, in order to broaden the high-end industry of stainless steel sheet and meet the differentiated needs of customers, it is of great practical significance to develop a rolling process for producing 0.1mm ultra-flat and ultra-hard precision stainless steel sheet with qualified and uniform surface roughness and flatness. Summary of the Invention

[0005] To address some or all of the technical problems existing in the prior art, the present invention provides a rolling method for 0.1mm thick ultra-flat and ultra-hard precision stainless steel sheets, comprising the following steps:

[0006] (1) Preset rolling parameters: Select stainless steel sheet raw materials with a thickness of 0.25±5μm~0.3mm±5μm and a width of 500~650mm, and roll them into 0.1mm thick stainless steel sheets using a Sendzimir 20-roll mill through 4~6 passes. Preset the rolling parameters of the Sendzimir 20-roll mill as follows:

[0007] Rolling speed: The rolling speed of the first pass is controlled at 100-120 m / min, the rolling speed of the finished product pass is controlled at 90-100 m / min, and the rolling speed of the remaining intermediate passes is controlled at 110-120 m / min;

[0008] Rolling unit tension: The unit tension at the first uncoiling entry point should be controlled at 180–200 N / mm.2 The unit tension at the exit of the finished product pass is controlled at 380–400 N / mm. 2 For the remaining intermediate passes, the unit tension at the exit of each pass should be increased by 20–50 N / mm compared to the unit tension at the exit of the previous pass. 2 The unit tension at the entrance of each of the remaining intermediate passes is manually adjusted according to the principle of keeping the total tension constant.

[0009] Rolling pressure: The rolling pressure of the first pass is controlled at 740-800KN, the rolling pressure of the second pass is adjusted to 950-1000KN, the rolling pressure of the finished product pass is controlled at 700-760KN, and the rolling pressure of the remaining intermediate passes is controlled at 700-800KN.

[0010] Rolling oil temperature: The rolling oil temperature is controlled at 35-40℃ throughout the rolling process;

[0011] (2) Production preparation: For raw materials with a width of 500-600mm, use an intermediate roller of 200*0.48mm; for raw materials with a width of 600-650mm, use an intermediate roller of 220*0.51mm; use a free roller with a crown of 0.1mm; use a steel sleeve with a side diameter difference of less than 0.2mm.

[0012] (3) Rolling: Start the Sendzimir 20-roll mill and roll according to the preset rolling parameters, wherein:

[0013] Before rolling starts, the preset plate shape curve is set as follows: the plate shape instrument curve uses the I-Uint curve, the plate shape curve inclination value is set to -20 to 40, the center wave value is set to 80, and the edge wave value is set to 20.

[0014] Before starting rolling, turn off AGC, reset APC roll allocation calculation to zero, and turn off AFC. When starting rolling, first manually press the minimum rolling force of 150KN. After the mill starts, control the rolling pressure at the preset rolling pressure of the first pass ±50KN. After the shape meter displays the shape curve, manually adjust the shape curve to the preset shape curve. Then manually adjust the rolling pressure to press the thickness to the preset exit thickness of the first pass. Then adjust the shape curve to the preset shape curve again. Then increase the rolling speed to the preset rolling speed of the first pass. After the shape, thickness, and speed are stable, put in AGC and AFC to start the first pass rolling and then roll the subsequent passes according to the preset rolling parameters.

[0015] The finished pass and the pass preceding the finished pass are rolled using M42 rolls with a surface roughness Ra of 0.4–0.5 μm and a diameter of 38–40 mm. The first pass and the remaining intermediate passes are rolled using M42 rolls with a surface roughness Ra of 0.5–0.6 μm and a diameter of 38–40 mm.

[0016] (4) Cooling after rolling: After rolling, the stainless steel sheet is cooled.

[0017] Furthermore, in the above-mentioned rolling method for 0.1mm thick ultra-flat and ultra-hard precision stainless steel sheet, the stainless steel sheet raw material is SUS316L material with a hardness of 180-200hv and the difference between the same sheet is controlled to be less than 2%.

[0018] As one specific implementation method, the above-mentioned rolling method for 0.1mm thick ultra-flat and ultra-hard precision stainless steel sheet is used as raw material, with SUS316L stainless steel sheet having a thickness of 0.25mm, a width of 515mm, a hardness of 180-200Hv, and a difference between sheets of the same material and less than 2%. The sheet is rolled in four passes using a Sendzimir 20-roll mill to obtain the target finished product of ultra-flat and ultra-hard precision stainless steel sheet with a thickness of 0.1mm and a width of 515mm.

[0019] In the preset rolling parameter step, the rolling parameters are set according to the following table:

[0020]

[0021]

[0022] In the production preparation step, an intermediate roller with a diameter of 200*0.48mm is selected;

[0023] In the rolling process, the preset plate profile curve is set as follows: the plate profile curve inclination value is set to -20, the center wave value is set to 80, and the edge wave value is set to 20. When the rolling starts, the rolling pressure is maintained at the preset rolling pressure of 740KN for the first pass. The plate profile curve is manually adjusted to the preset plate profile curve. Then, the rolling pressure is manually adjusted again to press the thickness to the preset exit thickness of 0.166mm for the first pass. After that, the plate profile curve is adjusted to the preset plate profile curve again. Finally, the rolling speed is increased to the preset rolling speed of 120m / min for the first pass.

[0024] As another specific implementation, the above-mentioned rolling method for 0.1mm thick ultra-flat and ultra-hard precision stainless steel sheet is used as raw material, with SUS316L stainless steel sheet having a thickness of 0.3mm, a width of 620mm, a hardness of 180-200Hv, and a difference between sheets of the same thickness of less than 2%. The sheet is rolled in 6 passes using a Sendzimir 20-roll mill to obtain the target finished product of ultra-flat and ultra-hard precision stainless steel sheet with a thickness of 0.1mm and a width of 620mm.

[0025] In the preset rolling parameter step, the rolling parameters are set according to the following table:

[0026] path 1 2 3 4 5 6 Inlet thickness [mm] 0.3 0.225 0.181 0.15 0.125 0.111 Export thickness [mm] 0.225 0.181 0.15 0.125 0.111 0.1 Deformation amount [%) 25 19.56 17.13 16.67 11.2 9.91 Rolling speed [m / min] 120 120 120 120 120 100 Roll material M42 M42 M42 M42 M42 M42 Roll diameter [mm] 38～40 38～40 38～40 38～40 38～40 38～40 Roll roughness [μm] 0.5～0.6 0.5～0.6 0.5～0.6 0.5～0.6 0.4～0.5 0.4～0.5 Rolling pressure [KN] 750 950 800 750 700 700 Rolling oil temperature [°C] 35～40 35～40 35～40 35～40 35～40 35～40 <![CDATA[Entrance unit tension [N / mm 2 > 180 260 280 300 330 370 <![CDATA[Export unit tension [N / mm 2 > 250 270 290 320 350 380

[0027] In the production preparation step, an intermediate roller with a diameter of 220*0.51mm is selected;

[0028] In the rolling process, the preset plate profile curve is set as follows: the plate profile curve inclination value is set to 40, the center wave value is set to 80, and the edge wave value is set to 20. When the rolling starts, the rolling pressure is maintained at the preset rolling pressure of 750KN for the first pass. The plate profile curve is manually adjusted to the preset plate profile curve. Then, the rolling pressure is manually adjusted again to press the thickness to the preset exit thickness of 0.225mm for the first pass. After that, the plate profile curve is adjusted to the preset plate profile curve again. Finally, the rolling speed is increased to the preset rolling speed of 120m / min for the first pass.

[0029] The rolling method for 0.1mm thick ultra-flat and ultra-hard precision stainless steel sheets of the present invention has the following advantages and beneficial effects:

[0030] It can produce 0.1mm ultra-flat and ultra-hard precision stainless steel sheets with qualified and uniform surface roughness and flatness. The flatness of the products is effectively controlled, the thickness tolerance fluctuation is small, and the surface quality is stable. This expands the high-end industry of stainless steel sheets, meets the differentiated needs of customers, and is suitable for industrial production. It can be widely used in electronics, aerospace, medical and other fields, which has important practical significance.

[0031] It can effectively improve rolling precision, thereby increasing product qualification rate and production efficiency, and reducing rolling costs;

[0032] By monitoring the surface morphology, dimensions, and other parameters of the steel in real time, rolling parameters can be adjusted in a timely manner to ensure that the steel meets the required ultra-hardness and ultra-flatness requirements. Furthermore, by cooling the steel after rolling, the residual stress of the stainless steel sheet can be reduced, thereby improving the product performance of the stainless steel sheet. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0034] The rolling method for 0.1mm thick ultra-flat and ultra-hard precision stainless steel sheets of this invention solves the problems in the production process of existing technologies by optimizing the roll system, reducing roll roughness, optimizing the reduction per pass, controlling the magnitude and distribution of rolling force, controlling rolling temperature and speed, and controlling sleeve taper. It obtains uniform metallographic structure and hardness, while ensuring the shape of the stainless steel sheet. The surface roughness and flatness of the stainless steel sheet are qualified and uniform, which broadens the high-end industry of stainless steel sheets, meets the differentiated needs of customers, and can be widely used in electronics, aerospace, medical and other fields.

[0035] Specifically, the rolling method for 0.1mm thick ultra-flat and ultra-hard precision stainless steel sheet of the present invention includes the following steps:

[0036] (1) Preset rolling parameters: Select stainless steel sheet raw material with a thickness of 0.25~0.3mm (±5μm) and a width of 500~650mm, and roll it into a 0.1mm thick stainless steel sheet using a Sendzimir 20-roll mill through 4~6 passes. Preset the rolling parameters of the Sendzimir 20-roll mill as follows:

[0037] Rolling speed: The rolling speed of the first pass is controlled at 100-120 m / min to ensure that the steel strip is deformed uniformly during the rolling process; the rolling speed of the finished pass is controlled at 90-100 m / min to ensure that the oil film adheres evenly during the rolling process and to prevent defects such as surface color difference caused by oil film rupture due to excessive speed; the rolling speed of the remaining intermediate passes is controlled at 110-120 m / min.

[0038] Rolling unit tension: The unit tension at the first uncoiling entry point should be controlled at 180–200 N / mm. 2 The unit tension at the exit of the finished product pass is controlled at 380–400 N / mm. 2 For the remaining intermediate passes, the unit tension at the exit of each pass should be increased by 20–50 N / mm compared to the unit tension at the exit of the previous pass. 2 The unit tension at the entrance of each of the remaining intermediate passes is manually adjusted according to the principle of constant total tension before and after the passes, in order to control rolling accuracy and reduce offset, while making the plate shape straighter during the rolling process, reducing bending and wavy, thereby ensuring plate quality.

[0039] Rolling pressure: The preset rolling pressure for the first pass is controlled at 740-800KN. For the second pass, due to work hardening, the preset rolling pressure is adjusted to 950-1000KN. For the finishing pass, due to the small deformation, in order to ensure the process requirements such as uniform thickness and good surface quality of the finished product, a preset rolling pressure of 700-760KN is used. The preset rolling pressure for the remaining intermediate passes is controlled at 700-800KN.

[0040] Rolling oil temperature: The rolling oil temperature is controlled at 35-40℃ throughout the rolling process.

[0041] (2) Production preparation: Select an intermediate roller according to the width of the sheet material. For the width of the material, select an intermediate roller of 200*0.48mm. For the width of the material, select an intermediate roller of 220*0.51mm. Select a free roller with a convexity of 0.1mm. Select a steel sleeve with a side diameter difference of less than 0.2mm.

[0042] (3) Rolling: Start the Sendzimir 20-roll mill and roll according to the set rolling parameters, wherein:

[0043] Before starting rolling, measure the actual position of the steel strip edge, confirm that the edge sensor of the strip roll is in good condition, and set the preset strip shape curve as follows: the strip shape meter curve uses the I-Uint curve, the strip shape curve inclination value is set to -20 to 40, the center wave value is set to 80, and the edge wave value is set to 20.

[0044] Before starting rolling, adjust parameters such as left and right eccentricity, rolling line, tension of the first and second intermediate sections, and turn off AGC (Automatic Thickness Control System). Set the roll allocation calculation of APC (Automatic Position Control System) to zero and turn off AFC (Automatic Form Control System). When starting rolling, manually press the minimum rolling force of 150KN. After the mill starts, stabilize the rolling pressure at the preset rolling pressure of the first pass ±50KN. After the form gauge displays the form curve, manually adjust the form curve to the preset form curve according to the edge tension. Then manually adjust the rolling pressure to press the thickness to the preset exit thickness of the first pass. Then adjust the form curve to the preset form curve again. Then increase the rolling speed to the preset rolling speed of the first pass. After the form, thickness, and speed are stable, put in AGC and AFC to start the first pass rolling and then roll subsequent passes according to the above rolling parameters.

[0045] The finished pass and the pass preceding the finished pass are rolled using M42 rolls with a surface roughness Ra of 0.4–0.5 μm and a diameter of 38–40 mm. The first pass and the remaining intermediate passes are rolled using M42 rolls with a surface roughness Ra of 0.5–0.6 μm and a diameter of 38–40 mm.

[0046] During the rolling process, the surface morphology of the steel and the parameters such as the shape meter curve are observed in real time so that the rolling parameters can be adjusted in a timely manner.

[0047] (4) Cooling after rolling: After rolling, the stainless steel sheet is cooled to reduce the residual stress and improve its performance.

[0048] Furthermore, in the rolling method of the 0.1mm thick ultra-flat and ultra-hard precision stainless steel sheet of the present invention, the stainless steel sheet raw material is a high-purity stainless steel SUS316L material with good corrosion resistance and hardness suitable for manufacturing ultra-thin metal samples, with a hardness of 180-200hv and the difference between the same plate is controlled to be less than 2%.

[0049] The following detailed description of the rolling method for 0.1mm thick ultra-flat and ultra-hard precision stainless steel sheet of the present invention, with reference to specific embodiments, is provided in detail.

[0050] Example 1

[0051] In the rolling method of 0.1mm thick ultra-flat and ultra-hard precision stainless steel sheet in Example 1, SUS316L stainless steel sheet with a thickness of 0.25mm, a width of 515mm, a hardness of 180-200Hv, and a difference of less than 2% between the same plates is used as raw material. The sheet is rolled in 4 passes using a Sendzimir 20-roll mill to obtain the target finished product of ultra-flat and ultra-hard precision stainless steel sheet with a thickness of 0.1mm and a width of 515mm.

[0052] In Example 1, the rolling parameters are set according to Table 1 below:

[0053] Table 1 Rolling process table for Example 1

[0054] path 1 2 3 4 Inlet thickness [mm] 0.25 0.166 0.133 0.113 Export thickness [mm] 0.166 0.133 0.113 0.1 Deformation amount [%) 33.6 19.87 15.03 11.50 Rolling speed [m / min] 120 120 120 100 Roll material M42 M42 M42 M42 Roll diameter [mm] 38～40 38～40 38～40 38～40 Roll roughness [μm] 0.5～0.6 0.5～0.6 0.4～0.5 0.4～0.5 Rolling pressure [KN] 740 960 700 760 Rolling oil temperature [°C] 35～40 35～40 35～40 35～40 <![CDATA[Entrance unit tension [N / mm 2 > 180 270 310 360 <![CDATA[Export unit tension [N / mm 2 > 260 300 350 380

[0055] (2) Production preparation: Select an intermediate roller with a diameter of 200*0.48mm; select a free roller with a crown of 0.1mm; select a steel sleeve with a side diameter difference of less than 0.2mm.

[0056] (3) Rolling: Start the Sendzimir 20-roll mill and roll according to the set rolling parameters, wherein:

[0057] Before rolling starts, the steel strip offset is measured to be 2mm after coiling. The preset plate shape curve is set as follows: the plate shape curve inclination value is set to -20, the middle wave value is set to 80, and the edge wave value is set to 20.

[0058] Before starting rolling, turn off AGC, reset APC roll allocation calculation to zero, and turn off AFC. When starting rolling, maintain the rolling pressure at the preset rolling pressure of 740KN for the first pass, manually adjust the plate profile curve to the preset plate profile curve, and then manually adjust the rolling pressure to press the thickness to the preset exit thickness of 0.166mm for the first pass. Then adjust the plate profile curve to the preset plate profile curve again, and finally increase the rolling speed to the preset rolling speed of 120m / min for the first pass. After the plate profile, thickness, and speed are stable, put in AGC and AFC to start the first pass rolling, and then carry out the subsequent 2nd to 4th passes rolling according to the above rolling parameters until the rolling of the 0.1mm thick ultra-flat and ultra-hard precision stainless steel sheet is completed.

[0059] Actual testing showed that the main technical indicators of the stainless steel sheet products produced using the rolling method of 0.1mm thick ultra-flat and ultra-hard precision stainless steel sheet in Example 1 can reach:

[0060] 1) Thickness deviation: 0.1±0.005mm;

[0061] 2) Flatness: 6 IU;

[0062] 4) Surface quality: The surface is uniform and consistent, without defects such as color difference, spiral pattern, or sand mark.

[0063] 5) Surface roughness: uniform, Ra is between 0.35 and 0.5 μm.

[0064] Example 2

[0065] In the rolling method of 0.1mm thick ultra-flat and ultra-hard precision stainless steel sheet in Example 2, SUS316L stainless steel sheet with a thickness of 0.3mm, a width of 620mm, a hardness of 180-200Hv, and a difference of less than 2% between the same plates is used as raw material. The sheet is rolled in 6 passes using a Sendzimir 20-roll mill to obtain the target finished product of ultra-flat and ultra-hard precision stainless steel sheet with a thickness of 0.1mm and a width of 620mm.

[0066] In Example 2, the rolling parameters are set according to Table 2 below:

[0067] Table 2 Rolling Process of Example 2

[0068] path 1 2 3 4 5 6 Inlet thickness [mm] 0.3 0.225 0.181 0.15 0.125 0.111 Export thickness [mm] 0.225 0.181 0.15 0.125 0.111 0.1 Deformation amount [%) 25 19.56 17.13 16.67 11.2 9.91 Rolling speed [m / min] 120 120 120 120 120 100 Roll material M42 M42 M42 M42 M42 M42 Roll diameter [mm] 38～40 38～40 38～40 38～40 38～40 38～40 Roll roughness [μm] 0.5～0.6 0.5～0.6 0.5～0.6 0.5～0.6 0.4～0.5 0.4～0.5 Rolling pressure [KN] 750 950 800 750 700 700 Rolling oil temperature [°C] 35～40 35～40 35～40 35～40 35～40 35～40 <![CDATA[Entrance unit tension [N / mm 2 > 180 260 280 300 330 370 <![CDATA[Export unit tension [N / mm 2 > 250 270 290 320 350 380

[0069] (2) Production preparation: Select an intermediate roller with a diameter of 220*0.51mm; select a free roller with a crown of 0.1mm; select a steel sleeve with a side diameter difference of less than 0.2mm.

[0070] (3) Rolling: Start the Sendzimir 20-roll mill and roll according to the set rolling parameters, wherein:

[0071] Before the rolling starts, the steel strip offset is measured to be 2.5mm after coiling. The preset plate shape curve is set as follows: the plate shape curve inclination value is set to 40, the center wave value is set to 80, and the edge wave value is set to 20.

[0072] Before starting rolling, turn off AGC, reset APC roll setting to zero, and turn off AFC. When starting rolling, maintain the rolling pressure at the preset rolling pressure of 750KN for the first pass, manually adjust the plate profile curve to the preset plate profile curve, and then manually adjust the rolling pressure to press the thickness to the preset exit thickness of 0.225mm for the first pass. Then adjust the plate profile curve to the preset plate profile curve again, and finally increase the rolling speed to the preset rolling speed of 120m / min for the first pass. After the plate profile, thickness, and speed are stable, put in AGC and AFC to start the first pass rolling, and then carry out the subsequent 2nd to 6th passes rolling according to the above rolling parameters until the rolling of the 0.1mm thick ultra-flat and ultra-hard precision stainless steel sheet is completed.

[0073] Actual testing showed that the main technical indicators of the stainless steel sheet products produced using the rolling method of the 0.1mm thick ultra-flat and ultra-hard precision stainless steel sheet in Example 2 can achieve the following:

[0074] 1) Thickness deviation: 0.1±0.005mm;

[0075] 2) Flatness: 6 IU;

[0076] 4) Surface quality: The surface is uniform and consistent, without defects such as color difference, spiral pattern, or sand mark.

[0077] 5) Surface roughness: uniform, Ra is between 0.35 and 0.5 μm.

[0078] In summary, this invention fully utilizes the advantages of the Sendzimir 20-roll mill and solves the problems in the existing production process by optimizing the roll system, reducing roll roughness, optimizing the reduction per pass, controlling the magnitude and distribution of rolling force, controlling rolling temperature and speed, and controlling sleeve taper. Compared with the existing technology, the rolling method of this invention for 0.1mm thick ultra-flat and ultra-hard precision stainless steel sheets has the following advantages and beneficial effects:

[0079] (1) It can produce 0.1mm ultra-flat and ultra-hard precision stainless steel sheets with qualified and uniform surface roughness and flatness. The flatness of the product is effectively controlled, the thickness tolerance fluctuates little, and the surface quality is stable. This broadens the high-end industry of stainless steel sheets, meets the differentiated needs of customers, and is suitable for industrial production. It can be widely used in electronics, aerospace, medical and other fields, which has important practical significance.

[0080] (2) It can effectively improve rolling precision, thereby increasing product qualification rate and production efficiency, and reducing rolling cost;

[0081] (3) By real-time monitoring of the surface morphology, size and other parameters of the steel, the rolling parameters can be adjusted in a timely manner so that the steel can meet the required ultra-hardness and ultra-flatness requirements. Furthermore, by cooling after rolling, the residual stress of the stainless steel sheet can be reduced and the product performance of the stainless steel sheet can be improved.

[0082] It should be noted that, in this document, the term "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rolling method for a 0.1mm thick ultra-flat and ultra-hard precision stainless steel sheet, characterized in that, Includes the following steps: (1) Preset rolling parameters: Select stainless steel sheet raw materials with a thickness of 0.25mm±5μm~0.3mm±5μm and a width of 500~650mm, and roll them into 0.1mm thick stainless steel sheets using a Sendzimir 20-roll mill through 4~6 passes. Preset the rolling parameters of the Sendzimir 20-roll mill as follows: Rolling speed: The rolling speed of the first pass is controlled at 100~120m / min, the rolling speed of the finished product pass is controlled at 90~100m / min, and the rolling speed of the remaining intermediate passes is controlled at 110~120m / min; Rolling unit tension: The unit tension at the first uncoiling entry point should be controlled at 180~200 N / mm. 2 The unit tension at the exit of the finished product pass is controlled at 380~400 N / mm. 2 For the remaining intermediate passes, the unit tension at the exit of each pass should be increased by 20-50 N / mm compared to the unit tension at the exit of the previous pass. 2 The unit tension at the entrance of each of the remaining intermediate passes is manually adjusted according to the principle of keeping the total tension constant. Rolling pressure: The rolling pressure of the first pass is controlled at 740~800KN, the rolling pressure of the second pass is adjusted to 950~1000KN, the rolling pressure of the finished product pass is controlled at 700~760KN, and the rolling pressure of the remaining intermediate passes is controlled at 700~800KN. Rolling oil temperature: The rolling oil temperature is controlled at 35~40℃ throughout the rolling process; (2) Production preparation: For raw materials with a width of 500~600mm, use an intermediate roller of 200*0.48mm; for raw materials with a width of 600~650mm, use an intermediate roller of 220*0.51mm; use a free roller with a crown of 0.1mm; use a steel sleeve with a side diameter difference of less than 0.2mm. (3) Rolling: Start the Sendzimir 20-roll mill and roll according to the preset rolling parameters, wherein: Before rolling starts, the preset plate shape curve is set as follows: the plate shape meter curve uses the I-Unit curve, the plate shape curve inclination value is set to -20~40, the center wave value is set to 80, and the edge wave value is set to 20. Before starting rolling, turn off AGC, reset APC roll allocation calculation to zero, and turn off AFC. When starting rolling, first manually press the minimum rolling force of 150KN. After the mill starts, control the rolling pressure at the preset rolling pressure of the first pass ±50KN. After the shape meter displays the shape curve, manually adjust the shape curve to the preset shape curve. Then manually adjust the rolling pressure to press the thickness to the preset exit thickness of the first pass. Then adjust the shape curve to the preset shape curve again. Then increase the rolling speed to the preset rolling speed of the first pass. After the shape, thickness, and speed are stable, put in AGC and AFC to start the first pass rolling and then roll the subsequent passes according to the preset rolling parameters. The finished pass and the pass preceding the finished pass are rolled using M42 rolls with a surface roughness Ra of 0.4~0.5μm and a diameter of 38~40mm. The first pass and the remaining intermediate passes are rolled using M42 rolls with a surface roughness Ra of 0.5~0.6μm and a diameter of 38~40mm. (4) Cooling after rolling: After rolling, the stainless steel sheet is cooled.

2. The rolling method for 0.1mm thick ultra-flat and ultra-hard precision stainless steel sheet according to claim 1, characterized in that, The stainless steel sheet material is SUS316L, with a hardness of 180~200hv and the difference between the same sheet is controlled to be less than 2%.

3. The rolling method for 0.1mm thick ultra-flat and ultra-hard precision stainless steel sheet according to claim 1, used as raw material SUS316L stainless steel sheet with a thickness of 0.25mm, a width of 515mm, a hardness of 180~200Hv, and a difference between sheets of the same thickness and less than 2%, is used to produce a target finished product of ultra-flat and ultra-hard precision stainless steel sheet with a thickness of 0.1mm and a width of 515mm through 4 passes using a Sendzimir 20-roll mill, characterized in that: In the preset rolling parameter step, the rolling parameters are set according to the following table: ； In the production preparation step, an intermediate roller with a diameter of 200*0.48mm is selected; In the rolling process, the preset plate profile curve is set as follows: the plate profile curve inclination value is set to -20, the center wave value is set to 80, and the edge wave value is set to 20. When the rolling starts, the rolling pressure is maintained at the preset rolling pressure of 740KN for the first pass. The plate profile curve is manually adjusted to the preset plate profile curve. Then, the rolling pressure is manually adjusted again to press the thickness to the preset exit thickness of 0.166mm for the first pass. After that, the plate profile curve is adjusted to the preset plate profile curve again. Finally, the rolling speed is increased to the preset rolling speed of 120m / min for the first pass.

4. The rolling method for 0.1mm thick ultra-flat and ultra-hard precision stainless steel sheet according to claim 1, used as raw material SUS316L stainless steel sheet with a thickness of 0.3mm, a width of 620mm, a hardness of 180~200Hv, and a difference between the same plate and the same plate is less than 2%, is used to produce a target finished product of ultra-flat and ultra-hard precision stainless steel sheet with a thickness of 0.1mm and a width of 620mm through 6 passes using a Sendzimir 20-roll mill, characterized in that: In the preset rolling parameter step, the rolling parameters are set according to the following table: ； In the production preparation step, an intermediate roller with a diameter of 220*0.51mm is selected; In the rolling process, the preset plate profile curve is set as follows: the plate profile curve inclination value is set to 40, the center wave value is set to 80, and the edge wave value is set to 20. When the rolling starts, the rolling pressure is maintained at the preset rolling pressure of 750KN for the first pass. The plate profile curve is manually adjusted to the preset plate profile curve. Then, the rolling pressure is manually adjusted again to press the thickness to the preset exit thickness of 0.225mm for the first pass. After that, the plate profile curve is adjusted to the preset plate profile curve again. Finally, the rolling speed is increased to the preset rolling speed of 120m / min for the first pass.

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