A method for eliminating unilateral waves in cold-rolled stainless steel coils

Abstract

The present invention discloses an adjustment method for eliminating unilateral waves on a cold-rolled stainless steel coil. The method belongs to the field of coil shape control technology and is applied to the straightening section of a cold rolling production line. The adjustment method comprises: 1) determining the desired coil shape; 2) adjusting a straightening device to control the output shape of the coil; and 3) evaluating the surface flatness of the finished coil. The method adjusts the upper and lower heights of the lower roller group of the anti-bend straightening rollers according to the actual thickness of the coil, thereby obtaining a straight or curved coil shape. The coil surface flatness does not exceed 5mm, fully meeting customer requirements. This method changes the traditional method for determining the cold-rolled 2B stainless steel coil shape, eliminates poor shape defects, and achieves desired results simply by changing operating habits. This method does not require equipment modification or additional equipment or instruments, resulting in zero fixed asset investment. By adjusting the upper and lower heights of the anti-bend straightening rollers, the longitudinal shape requirements of the coils of varying thicknesses are met.

Description

Technical Field

[0001] The invention belongs to the technical field of plate coil shape control, and in particular relates to an adjustment method for eliminating unilateral waves of a cold-rolled stainless steel plate coil. Background Art

[0002] Cold-rolled stainless steel coils are a key component of the steel industry's products. They serve as raw material for downstream processing, such as flattening and slitting. Since most cold-rolled coils undergo surface finishing, such as frosting or mirror polishing, high flatness requirements are required during this process to avoid compromising the uniformity of the finished surface. The current market default for cold-rolled coil flatness is ≤10mm. To ensure the flatness of the finished cold-rolled coil, the coils undergo flattening and straightening after heat treatment and pickling.

[0003] Plate flatness inspection stations are set up in the straightening section and coiling section of the cold rolling production line. The flatness of the plate and coil is manually inspected visually and the flatness grade is assessed to determine whether the plate and coil need to be re-leveled.

[0004] Normally, inspectors visually inspect a coil that has a straight horizontal surface and is deemed to meet requirements. However, some coils, after being uncoiled and cut into four-foot sheets, exhibit "unilateral ripples" exceeding 10mm. This necessitates re-straightening before use, a cost that is borne by the supplier of the raw material, known as after-sales compensation. This "unilateral ripple" defect not only increases product costs but also significantly impacts the product's image and reduces customer satisfaction with the company's products.

[0005] Therefore, it is necessary to study a regulation method to eliminate the unilateral waves of cold-rolled stainless steel coils. Summary of the Invention

[0006] In order to at least solve the problem of single-side wave defects in the coil in the above-mentioned prior art, the present invention provides the following technical solution: an adjustment method for eliminating single-side waves in cold-rolled stainless steel coils, applied to the straightening section of a cold rolling production line, the adjustment method comprising:

[0007] 1) Determine the plate type to be output;

[0008] 2) adjusting the tensioning and straightening device to control the output shape of the coil;

[0009] 3) Evaluate the flatness of the finished coil surface.

[0010] Furthermore, in the above-mentioned adjustment method for eliminating unilateral waves of cold-rolled stainless steel coils, step 1) specifically includes the following steps:

[0011] 1.1) measuring the thickness of the coil;

[0012] 1.2) Determine whether the actual thickness of the coil is less than 0.9 mm. If so, proceed to step 1.3); otherwise, proceed to step 1.4);

[0013] 1.3) Make sure the output coil shape is a straight “I” shape;

[0014] 1.4) Determine whether the actual thickness of the coil is 0.9 to 1.5 mm. If so, proceed to step 1.5); otherwise, proceed to step 1.6);

[0015] 1.5) Make sure the output coil shape is a "C" concave surface;

[0016] 1.6)End.

[0017] Furthermore, in the above-mentioned adjustment method for eliminating unilateral waves of cold-rolled stainless steel coils, the straightening device in step 2) includes: a first bending roller group, a second bending roller group, and an anti-bending straightening roller group arranged in sequence along the moving direction of the coil;

[0018] The first bending roller group includes: a first upper roller group and a first lower roller group that are staggered up and down, and the first lower roller group is located at the entrance side of the first upper roller group;

[0019] The second bending roller group includes: a second upper roller group and a second lower roller group that are staggered up and down, the second lower roller group is located at the outlet side of the first upper roller group, and the second lower roller group is located at the inlet side of the second upper roller group;

[0020] The upper roller groups of the anti-bending straightening roller group are located on both radial sides of the lower roller group whose height can be freely raised and lowered.

[0021] Furthermore, in the above-mentioned adjustment method for eliminating unilateral waves of cold-rolled stainless steel coils, the height of the lower roller group of the anti-bending straightening roller group is adjusted in the step 2), and the plate shape determined in the step 1) is output.

[0022] Furthermore, in the above-mentioned adjustment method for eliminating unilateral waves of cold-rolled stainless steel coils, the thickness of the coil is 0.9 to 1.5 mm, the height of the lower roller group of the anti-bending straightening roller group is adjusted to 4.3 to 5.0 mm, and a "C"-shaped concave curved plate-shaped coil is output.

[0023] Furthermore, in the above-mentioned adjustment method for eliminating unilateral waves of cold-rolled stainless steel coils, the output height of the "C"-shaped concave curved coils needs to be 15 to 25 mm.

[0024] Furthermore, in the above-mentioned adjustment method for eliminating unilateral waves of cold-rolled stainless steel coils, in step 3), the transverse surface of the finished coil is visually inspected from one side to assess the flatness grade of the finished coil surface.

[0025] Furthermore, in the above-mentioned adjustment method for eliminating unilateral waves of cold-rolled stainless steel coils, the upper roller group of the anti-bending straightening roller group includes: a first fixed roller and a second fixed roller arranged in sequence;

[0026] The first fixed roller is located at the exit side of the second upper roller group, and the first fixed roller is in rotational contact with the upper surface of the coil;

[0027] The second fixed roller is horizontally located at the outlet side of the first fixed roller, and the second fixed roller is in rotational contact with the upper surface of the plate coil. The second fixed roller cooperates with the first fixed roller to tighten both ends of the plate coil.

[0028] Furthermore, in the above-mentioned adjustment method for eliminating unilateral waves of cold-rolled stainless steel coils, the lower roll group of the anti-bend straightening roll group includes: a working roll, two intermediate rolls and three support rolls arranged in sequence from top to bottom;

[0029] The working roller is located below and in the middle of the first fixed roller and the second fixed roller, and the working roller is in rotational contact with the lower surface of the coil;

[0030] The two intermediate rollers are distributed on both radial sides of the working roller, both of the intermediate rollers are in contact with the lower surface of the working roller, and the pressure between the two intermediate rollers is symmetrically distributed;

[0031] The three support rollers drive the intermediate roller and the working roller to move up and down through a lifting system.

[0032] Furthermore, in the above-mentioned adjustment method for eliminating unilateral waves of cold-rolled stainless steel coils, the elongation of the coils is 0.3-1.2%, and the rising amount of the coils is 5-10 mm.

[0033] The technical solution provided by the embodiment of the present invention has the following beneficial effects:

[0034] According to the actual thickness of the plate coil, the upper and lower heights of the anti-bend straightening rollers are adjusted to obtain a straight or curved plate shape. The plate surface straightness of the plate coil does not exceed 5mm, which fully meets the customer's usage requirements. This changes the traditional method of judging the plate shape of stainless steel cold-rolled plate coils and eliminates the impact of poor plate shape defects on the company's product quality. In addition, after adopting this plate shape adjustment method, the company's after-sales service received complaints of "single-side waves" from the original 30 coils / month to 0.1 coils / month, basically eliminating the impact of "single-side waves" defects on the company's product quality.

[0035] The desired effect can be achieved by changing operating habits, without the need for equipment modification or additional equipment and instruments, and is a zero fixed asset investment method;

[0036] By adjusting the upper and lower heights of the anti-bending straightening rollers, the requirements for the longitudinal shape of the coils with different thicknesses can be met. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic diagram showing the principle of adjusting the longitudinal shape of a cold-rolled stainless steel coil by a straightening device for eliminating unilateral waves in the coil provided by an embodiment of the present invention;

[0038] Figure 2 A schematic structural diagram of an anti-bending straightening roller group in a tension-leveling device for eliminating unilateral waves on a cold-rolled stainless steel coil provided by an embodiment of the present invention;

[0039] Figure 3 It is a structural diagram of a single-sided corrugated plate in the prior art;

[0040] Figure 4 A schematic diagram for testing the straightness of a straight "I"-shaped plate coil produced by a tension-leveling device for eliminating unilateral waves of a cold-rolled stainless steel plate coil provided by an embodiment of the present invention;

[0041] Figure 5 A schematic diagram for testing the straightness of a "C"-shaped concave curved plate coil produced by a tension-leveling device for eliminating unilateral waves of a cold-rolled stainless steel plate coil provided by an embodiment of the present invention;

[0042] Figure 6 A schematic diagram illustrating the operation of measuring the height of a "C"-shaped curved plate coil produced by a tension-leveling device for eliminating single-side waves of a cold-rolled stainless steel plate coil provided by an embodiment of the present invention;

[0043] Figure 7 A schematic structural diagram of a straightening device for eliminating unilateral waves on a cold-rolled stainless steel coil provided by an embodiment of the present invention;

[0044] In the figure: 1. Plate coil; 2. First fixed roller; 3. Second fixed roller; 4. Anti-bending straightening roller group; 401. Working roller; 402. Intermediate roller; 403. Support roller; 5. Four-foot plate; 6. Single-side wave; 7. First bending roller group; 701. First upper roller group; 702. First lower roller group; 8. Second bending roller group; 801. Second upper roller group; 802. Second lower roller group; 9. First measuring tape; 901. Starting section; 902. Return section; 10. Second measuring tape; A is the first intersection point; B is the second intersection point; h is the height of the curved plate coil. DETAILED DESCRIPTION

[0045] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0046] In the description of the present invention, the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention. The terms "connected", "connected", and "set" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components; they can be wired electrical connections, radio connections, or wireless communication signal connections. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0047] See also Figure 1-7 The present invention provides an adjustment method for eliminating unilateral waves of cold-rolled stainless steel coils, which is applied to the straightening section of a cold rolling production line. The adjustment method includes:

[0048] 1) Determine the plate type of the coil 1 to be output.

[0049] The plate coil 1 here is one of the stainless steel 2B plate, 2D plate, 2E plate, and BA plate. Due to the different thicknesses of the plate coil 1, when producing the cold-rolled plate coil 1, it is necessary to select the appropriate output plate type in advance according to the actual thickness of the plate coil 1. This can effectively reduce the occurrence of single-side wave 6 defects in the plate coil 1. It should be noted that this application is mainly suitable for commonly used stainless steel plate coils on the market with a thickness of 0.3 to 1.5 mm.

[0050] In step 1), the following steps are specifically included:

[0051] 1.1) Before starting the straightening work, measure the thickness of the coil 1 with the help of tools such as tape measure, micrometer, and box ruler.

[0052] 1.2) Determine whether the actual thickness of coil 1 is less than 0.9 mm. If so, that is, the thickness of coil 1 is less than 0.9 mm, execute step 1.3). Otherwise, execute step 1.4), that is, perform a second value comparison.

[0053] 1.3) Make sure the coil 1 to be output has a straight “I” shape.

[0054] 1.4) Determine whether the actual thickness of coil 1 is 0.9-1.5 mm. If so, that is, the thickness of coil 1 is 0.9-1.5 mm, execute step 1.5); otherwise, execute step 1.6).

[0055] 1.5) Determine that the plate shape of the coil 1 to be output is a "C"-shaped concave surface.

[0056] 1.6)End.

[0057] 2) Adjust the tensioning and straightening device to control the output plate shape of the plate roll 1.

[0058] In step 2), the straightening device includes: a first bending roller group 7, a second bending roller group 8 and an anti-bending straightening roller group 4 which are sequentially arranged along the moving direction of the coil 1.

[0059] The first bending roll set 7 includes a first upper roll set 701 and a first lower roll set 702, which are vertically offset. The first lower roll set 702 is located on the inlet side of the first upper roll set 701. The second bending roll set 8 includes a second upper roll set 801 and a second lower roll set 802, which are vertically offset. The second lower roll set 802 is located on the outlet side of the first upper roll set 701, and the second lower roll set 802 is located on the inlet side of the second upper roll set 801. It should be noted that the first upper roll set 701 of the first bending roll set 7 and the second upper roll set 801 of the second bending roll set 8 are collinear, and the first lower roll set 702 of the first bending roll set 7 and the second lower roll set 802 of the second bending roll set 8 are collinear. In other words, the reduction in roll width (i.e., the reduction in coil height after rolling) of the first bending roll set 7 and the second bending roll set 8 are identical. The upper rollers of the anti-bend straightening roller set 4 (also called the fixed roller set, whose horizontal position does not change) are located radially on either side of the lower roller set (also called the anti-bend straightening rollers), which can be raised and lowered. Adjusting the height of the anti-bend straightening rollers adjusts the longitudinal shape of the coil 1. Furthermore, for coils 1 with a thickness of 0.9 to 1.5 mm, the height of the lower roller set of the anti-bend straightening roller set is adjusted to 4.3 to 5.0 mm, resulting in a C-shaped, concave, curved coil.

[0060] In this embodiment, the center line of the running direction of the coil 1 (i.e. Figure 1The long dotted line from left to right in the main view shown is used as a reference. The first lower roller group 702 first lifts the parallel-running plate roll 1 upward (the lifting amount is h1), so that the plate roll 1 bends upward, and the bent plate roll 1 continues to run, and then contacts the lower surface of the first upper roller group 701. The first upper roller group 701 presses down the bent plate roll 1, and then the second lower roller group 802 lifts the plate roll 1 upward (the lifting amount is h1). The plate roll 1 continues to run and then contacts the lower surface of the second upper roller group 801. The second upper roller group 801 presses down the bent plate roll 1. After passing through the two bending roller groups, the plate roll 1 produces a certain elongation. At this time, the plate roll 1 is arched downward, that is, it is tilted downward in a "C" shape. Subsequently, the "C" see-off roll 1 enters the anti-transverse bending straightening roller group 4. The position of the upper roller of the anti-transverse bending straightening roller group 4 remains unchanged, and the lower roller of the anti-transverse bending straightening roller group 4 (also called the anti-transverse bending straightening roller) pushes the "C" see-off roll 1 upward (the increase is h2). The higher it rises, the more the "C" see-off roll 1 deforms into an "I" shape, which gives the roll 1 a reverse force. When the thickness of the roll 1 is 0.9-1.5mm, the height of the anti-transverse bending straightening roller is adjusted to the range of 4.3-5.0mm to obtain a "C"-shaped concave curved plate roll 1.

[0061] Reference Figure 2 As shown, the upper roller group of the anti-lateral bending straightening roller group 4 is located above the plate coil 1, and the upper roller group of the anti-lateral bending straightening roller group 4 includes: a first fixed roller 2 and a second fixed roller 3 arranged in sequence along the running direction of the plate coil 1.

[0062] The first fixed roller 2 is located on the exit side of the second upper roller assembly 801 and is in rotational contact with the upper surface of the coil 1. The second fixed roller 3 is located horizontally on the exit side of the first fixed roller 2 and is in rotational contact with the upper surface of the coil 1. The second fixed roller 3 cooperates with the first fixed roller 2 to tighten both ends of the coil 1. It should be noted that the first fixed roller 2 and the second fixed roller 3 are located on the same straight line and their positions do not change.

[0063] In this embodiment, the upper roller group of the anti-transverse bending straightening roller group 4 processes the downward "C" see-off roll 1 that has been processed by two groups of bending roller groups. The first fixed roller 2 is in rotational contact with the upper surface of the downward "C" see-off roll 1, which can initially change the stress distribution structure on the roll 1, so that the stress is balanced and symmetrically distributed on the cross section of the roll 1, and the transverse bending is initially reduced. Subsequently, the second fixed roller 3 is in rotational contact with the upper surface of the roll 1 after being corrected by the first fixed roller 2, and the transverse bending of the roll 1 is further reduced.

[0064] The lower roller group of the anti-bending straightening roller group 4 (also called the anti-bending straightening roller) is located below the plate coil 1. The lower roller group of the anti-bending straightening roller group 4 includes: a working roller 401, two intermediate rollers 402 and three support rollers 403 arranged in sequence from top to bottom.

[0065] The work roll 401 is located below and center between the first fixed roll 2 and the second fixed roll 3. The work roll 401 is in rotational contact with the lower surface of the coil 1. Two intermediate rolls 402 are located on the same straight line and radially opposite the work roll 401. Both intermediate rolls 402 are in contact with the lower surface of the work roll 401, and the inter-roll pressure between the two intermediate rolls 402 is symmetrically distributed. The three support rolls 403 are driven up and down by a lifting system. The lifting system consists of a motor and a lifting mechanism. The motor drives the lifting mechanism to adjust the height of the three fixed support rolls 403.

[0066] In this embodiment, the lifting system drives the three support rollers 403 to move up and down, the three support rollers 403 drive the intermediate roller 402 to move up and down, and the intermediate roller 402 simultaneously drives the working roller 401 to move up and down, thereby realizing the height adjustment of the anti-bending straightening roller.

[0067] In step 2), the height of the lower roller group of the anti-bending straightening roller group is adjusted to output the plate shape determined in step 1).

[0068] If it is necessary to output a "I"-shaped straight surface, adjust the height of the anti-bending straightening roller group 4 to adjust the plate surface of the plate roll 1 to a straight line. If it is necessary to output a "C"-shaped concave curved surface, adjust the height of the anti-bending straightening roller group 4 to adjust the plate surface of the plate roll 1 to a "C"-shaped curved surface.

[0069] Table 1: Relationship between coil 1 thickness and rise

[0070] Coil 1 thickness (mm) Elongation % Rise (mm) <0.30 0.3 5 0.30-0.39 0.4 5 0.40-0.49 0.4 5 0.5-0.62 0.5 5 0.63-0.74 0.6 5 0.75-0.87 0.8 10 0.87-0.99 0.9 10 1.0-1.24 1 10 1.25-1.49 1.2 10

[0071] The data in Table 1 were obtained through multiple experiments. For coil 1 with a thickness not exceeding 1.5 mm, the elongation of coil 1 (the ratio of the total deformation ΔL of the gauge section after tensile fracture of coil 1 to the original gauge length L, which can be used as the only deformation indicator for temper rolling) is 0.3-1.2%, and the rise of coil 1 (the height h1 from the centerline of the coil 1 in its running direction) is 5-10 mm.

[0072] When the thickness of the coil 1 is less than 0.9 mm, the adjustment height of the lower roller group (also called the anti-bending straightening roller) of the anti-bending straightening roller group 4 is 3.0 to 5.0 mm. Within this range, the output plate shape of the coil 1 is a straight "I" shape.

[0073] Table 2: Relationship between coil 1 thickness, anti-bend straightening roller adjustment height, and output plate shape

[0074]

[0075] Multiple experiments yielded the data shown in Table 2. For coils 1 with a thickness of 0.9 to 1.5 mm, the lower roller assembly of the anti-bend straightening roller group 4 (also known as the anti-bend straightening roller) can be adjusted to a height of 5.0 to 6.0 mm. Within this range, the output profile of the coil 1 is a straight, "I" shape. The lower roller assembly of the anti-bend straightening roller group 4 (also known as the anti-bend straightening roller) can be adjusted to a height of 4.3 to 5.0 mm. Within this range, the output profile of the coil 1 is a concave, "C"-shaped surface. Furthermore, the output height of the "C"-shaped, concave, curved coil 1 is 15 to 25 mm.

[0076] The output profile of the coil 1 is controlled by adjusting the height of the lower roller assembly (also called the anti-bend straightening roller) of the anti-bend straightening roller assembly 4, thereby adjusting the longitudinal shape of the coil 1. Coil 1 of varying thicknesses requires a different height adjustment range for the lower roller assembly (also called the anti-bend straightening roller). It should be noted that the reason for outputting different profiles for coils of varying thicknesses is to ensure that the flatness of the finished coil 1, when cut into four-foot plates (5), meets customer requirements—a flatness of no more than 10mm.

[0077] Further observation shows that for plate coils 1 with a thickness of 0.9 to 1.5 mm, for plate coils 1 of the same thickness, the adjustment height of the anti-bending straightening roller when outputting an "I"-shaped straight plate coil 1 is greater than the adjustment height of the anti-bending straightening roller when outputting a "C"-shaped concave curved plate coil 1. That is to say, the higher the adjustment height of the anti-bending straightening roller, the closer the output plate shape of the plate coil 1 is to a straight surface.

[0078] For coils 1 with a thickness of 0.9 to 1.5 mm, as the thickness of the coil 1 increases, the adjustment height of the anti-bend straightening roller gradually decreases, and the output height of the "C"-shaped concave curved coil 1 gradually increases. In other words, the output height of the "C"-shaped concave curved coil 1 is proportional to the thickness of the coil 1. That is, the thicker the coil 1, the higher the output height of the "C"-shaped concave curved coil 1, and vice versa. The adjustment height of the anti-bend straightening roller is inversely proportional to the thickness of the coil 1. That is, the thicker the coil 1, the lower the adjustment height of the anti-bend straightening roller, and vice versa.

[0079] It should be noted that the height of the "C"-shaped concave curved panel roll 1 refers to the axial height between the lowest point of the concave curved surface and the edge.

[0080] refer to Figure 6As shown, the specific process of measuring the height of the "C"-shaped concave curved panel roll 1 is as follows: Step 1: Fix one end of the first measuring tape 9, and one person stretches the first measuring tape 9 from one end to the other end in the width direction of the "C"-shaped concave curved panel roll 1 (the length of the first measuring tape 9 stretched so far is the starting section 901). Step 2: Fold back along the outer wall of the "C"-shaped concave curved panel roll 1, stretch it for a certain length, and then fix the movable end of the first measuring tape 9 (the length of the first measuring tape 9 stretched when it is folded back so far is the return section 902). It should be noted that the part of the return section 902 from the lowest concave point to the fixed point of the movable end is always parallel to the starting section 901. Step 3: Pull the second measuring tape 10 in a direction perpendicular to the width of the "C"-shaped concave curved panel roll 1, so that the second measuring tape 10 is always perpendicular to the first measuring tape 9 (referring to the two parallel small sections of the first measuring tape 9). Step 4: Record the value at the first intersection A of the return section 902 of the second tape measure 10 and the first tape measure 9, and the value at the second intersection B of the starting section 901. The difference between the larger value and the smaller value is the actual height h of the "C"-shaped concave curved panel roll 1.

[0081] It should be noted that both tape measures need to be tightened during measurement, especially the part of the first tape measure 9 that contacts the "C"-shaped concave surface needs to be close to the "C"-shaped concave surface. The measurement process is generally more suitable for 2-4 people to complete together.

[0082] 3) Evaluate the flatness of the finished coil 1.

[0083] In step 3), the measurement personnel follow the conventional method (refer to Figure 4 and Figure 5 As shown in the figure, visually inspect the transverse surface of the finished coil 1 from one side to assess the flatness level of the finished coil 1 and determine whether the finished coil 1 needs to be re-leveled. If the flatness of the finished coil 1 does not meet the quality standards and a single-side wave 6 is greater than 10 mm, re-leveling is required to correct the coil shape.

[0084] After the finished coil 1 is produced, it is necessary to take samples and test them in time. Figure 3 The specific process is as follows:

[0085] a. Take samples from the finished coil 1 and cut the samples horizontally or longitudinally into four-foot boards 5.

[0086] b. Use a tape measure, meter stick, box ruler or other tools to measure the flatness of the surface of the four-foot board 5.

[0087] c. Determine whether the actual value of the flatness of the four-foot board 5 does not exceed 10mm. If so, that is, the single-side wave 6 on the finished plate roll 1 does not exceed 10mm, it is determined to meet the requirements. Otherwise, it is sent back to the flattening section and the plate shape is corrected.

[0088] After several measurements using this adjustment method, the flatness of the plate surface of the coil 1 produced does not exceed 5 mm. Moreover, after adopting this plate shape adjustment method, the "single-side wave 6" defect of the coil 1 is basically eliminated.

[0089] Reference Figure 7 It should be noted that the arrow from left to right in the figure represents the running direction of the plate coil 1, and the dotted line from left to right represents the center line of the plate coil 1. For the convenience of understanding, the positions of the main structures of the first bending roller group 7, the second bending roller group 8 and the anti-transverse bending straightening roller group 4 are marked. From left to right, the first rectangular box represents the entire first bending roller group 7, the second rectangular box represents the entire second bending roller group 8, and the last triangular box represents the entire anti-transverse bending straightening roller group 4. Only the general structure and orientation are illustrated here, and it does not fully represent the actual product.

[0090] The principle of adjusting the height of the anti-bending straightening roller to meet the requirements of the longitudinal shape of the coil 1 is as follows:

[0091] The coil 1 enters the first bending roll group 7 and the second bending roll group 8 from left to right in sequence. Both the first bending roll group 7 and the second bending roll group 8 have the lower roll group in front and the upper roll group behind. Such a position distribution facilitates the offset drawing of the coil 1, causing the coil 1 to have a certain elongation rate. The output coil 1 arches downward, that is, it "C" warps downward. Subsequently, the "C" warped coil 1 enters the anti-transverse bending straightening roll group 4. The upper roll group (the first fixed roll 2, the second fixed roll 3) and the lower roll group (composed of the working roll 401, the intermediate roll 402, and the support roll 403) of the anti-transverse bending straightening roll group 4 are in an inverted character shape. Such a position design is used to eliminate the "C" warp. Among them, the first fixed roll 2 first makes rolling contact with the coil 1, initially changing the stress distribution structure on the coil 1, making the stress evenly and symmetrically distributed on the cross-section of the coil 1, realizing the adjustment of the stretching amount of the coil 1, and initially reducing the transverse bending. Subsequently, the coil 1 reaches below the second fixed roll 3, and the second fixed roll 3 makes rolling contact with the coil 1, further eliminating the transverse bending of the coil 1. At the same time, the first fixed roll 2 and the second fixed roll 3 cooperate to press down the coil 1 to make both ends of the coil 1 tense. At this time, the lower roll group (also called the anti-transverse bending straightening roll) of the anti-transverse bending straightening roll is located below the coil 1. Adjust the height of the lower roll group (also called the anti-transverse bending straightening roll) of the anti-transverse bending straightening roll to continuously increase it. The top of the working roll 401 contacts the lowest depression point of the "C" warped coil 1 and jacks up the "C" warped coil 1, that is, gives a reverse force to the "C" warped coil 1, making the shape of the "C" warped coil 1 gradually deform into a "one" - shaped straight surface. If it is necessary to produce a "one" - shaped straight coil 1, adjust the height of the anti-transverse bending straightening roll upward to the specified position and stop; if it is necessary to change from a "one" - shaped straight surface to produce a "C" - shaped concave curved coil 1, adjust the height of the anti-transverse bending straightening roll in the reverse direction, that is, downward (relative to the height of the anti-transverse bending straightening roll when producing a straight coil) to the specified position and stop. At this time, the output coil 1 presents a "C" - shaped curved surface.

[0092] As is known by technical common sense, the present invention can be implemented by other embodiments that do not depart from its spiritual essence or essential features. Therefore, the above - disclosed embodiments are illustrative in all aspects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are encompassed by the present invention.

Claims

1. A method for eliminating unilateral waves in cold-rolled stainless steel coils, applied to the straightening section of a cold rolling production line, characterized in that: The adjustment method comprises: 1) Determine the plate type to be output; In step 1), the following steps are specifically included: 1.1) measuring the thickness of the coil; 1.2) Determine whether the actual thickness of the coil is less than 0.9 mm. If so, proceed to step 1.3); otherwise, proceed to step 1.4); 1.3) Make sure the output coil shape is "I" shaped straight surface; 1.4) Determine whether the actual thickness of the coil is 0.9 to 1.5 mm. If so, proceed to step 1.5); otherwise, proceed to step 1.6); 1.5) Determine whether the output coil shape is a "C" concave curved surface or a "I" straight surface; 1.6) End; 2) adjusting the tensioning and straightening device to control the output shape of the coil; The straightening device in step 2) comprises: a first bending roller group, a second bending roller group and an anti-bending straightening roller group arranged in sequence along the moving direction of the coil; The first bending roller group includes: a first upper roller group and a first lower roller group that are staggered up and down, and the first lower roller group is located at the entrance side of the first upper roller group; The second bending roller group includes: a second upper roller group and a second lower roller group that are staggered up and down, the second lower roller group is located at the outlet side of the first upper roller group, and the second lower roller group is located at the inlet side of the second upper roller group; The upper roller groups of the anti-bending straightening roller group are located on both radial sides of the lower roller group whose height can be freely raised and lowered; The first lower roller group, the first upper roller group, the second lower roller group and the second upper roller group sequentially push up, press down, push up and press down the plate coil so that the plate coil bends downward; The upper roller group of the anti-bend straightening roller group tightens the two ends of the plate coil from the second upper roller group, adjusts the height of the lower roller group of the anti-bend straightening roller group, and outputs the plate shape determined in step 1); 3) Evaluate the flatness of the finished coil surface.

2. The method for eliminating unilateral waves of cold-rolled stainless steel coil according to claim 1, characterized in that: The thickness of the plate coil is 0.9-1.5 mm, and the height of the lower roller group of the anti-bending straightening roller group is adjusted to 4.3-5.0 mm, and the plate coil with a "C"-shaped concave curved plate shape is output.

3. The method for eliminating unilateral waves of cold-rolled stainless steel coil according to claim 1, characterized in that: The "C"-shaped concave curved panel roll needs to have an output height of 15 to 25 mm.

4. The method for eliminating unilateral wave of cold-rolled stainless steel coil according to claim 1, characterized in that: In step 3), the transverse surface of the finished coil is visually inspected from one side to assess the flatness grade of the surface of the finished coil.

5. The method for eliminating unilateral wave of cold-rolled stainless steel coil according to claim 1, characterized in that: The upper roller group of the anti-bending straightening roller group includes: a first fixed roller and a second fixed roller arranged in sequence; The first fixed roller is located at the exit side of the second upper roller group, and the first fixed roller is in rotational contact with the upper surface of the coil; The second fixed roller is horizontally located at the outlet side of the first fixed roller, and the second fixed roller is in rotational contact with the upper surface of the plate coil. The second fixed roller cooperates with the first fixed roller to tighten both ends of the plate coil.

6. The method for eliminating unilateral wave of cold-rolled stainless steel coil according to claim 5, characterized in that: The lower roller group of the anti-bending straightening roller group includes: a working roller, two intermediate rollers and three support rollers arranged in sequence from top to bottom; The working roller is located below and in the middle of the first fixed roller and the second fixed roller, and the working roller is in rotational contact with the lower surface of the coil; The two intermediate rollers are distributed on both sides of the working roller in a radial direction, the two intermediate rollers are in contact with the lower surface of the working roller, and the pressure between the two intermediate rollers is symmetrically distributed; The three support rollers drive the intermediate roller and the working roller to move up and down through a lifting system.

7. The method for eliminating unilateral wave of cold-rolled stainless steel coil according to claim 1, characterized in that: The elongation of the coil is 0.3-1.2%, and the rise of the coil is 5-10 mm.

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