A method for controlling the shape of a stainless steel stretch leveler for a refrigerated container panel

Abstract

The application provides a cold storage container panel stainless steel pull straightening plate shape control method, which can eliminate the problems of low straightness qualification rate caused by the differences in incoming plate shape, camber, tail equipment, and the fact that the S roller after the tail equipment, the disc shear, and the tail winding are not on the same vertical line, and the disc shear does not tightly clamp the material, and significantly improves the straightness control level of the cold storage container panel stainless steel plate shape. The method comprises the following steps: (1) a pull straightening machine pressure technical parameter; (2) a disc shear supporting equipment technical parameter; (3) a pull straightening tension technical parameter; and (4) a pinch roll linkage control mode.

Description

Technical Field

[0001] This invention relates to a method for controlling the shape of stainless steel plates used in refrigerated container panels, mainly for straightening SUS410L / SUH409 / TN4 series stainless steel cold-rolled plates with a thickness ≤2.0mm and a width ≤1250mm. Specifically, it is a method for controlling the shape of the straightened plates by controlling the edge waviness to 0~1mm and the straightness to 0~0.05mm. Background Technology

[0002] Stainless steel refrigerated container panels are a key specialty product developed by Taiyuan Iron & Steel Group (TISCO). These panels are characterized by high flatness, good surface quality, and high dimensional accuracy. They are used for inner and outer linings of containers, with main varieties including SUS410L, SUH409, and TN4. The market has high added value, and contract volume is increasing year by year. Customers have strict requirements for straightness and panel shape, making production difficult. Defects such as edge waviness, quarter-wave, and camber are prone to occur during production, affecting customer use and significantly increasing production costs. Therefore, there is an urgent need to propose a method that is easy to operate on-site and can quickly and effectively solve this problem.

[0003] To address the aforementioned issues, this invention proposes a tension leveling plate shape control method with practical application value, which can quickly and effectively improve the quality control level of stainless steel tension leveling plates for refrigerated container panels. Summary of the Invention

[0004] The purpose of this invention is to address the above-mentioned problems by providing a method for controlling the shape of stainless steel tensioning plates in refrigerated container panels.

[0005] The purpose of this invention is achieved as follows: A method for controlling the shape of stainless steel straightening plates for refrigerated container panels, comprising the following aspects: (1) Solving the problem of work hardening edge waviness generated during the rolling process: adopting different straightening machine parameters for materials of different thicknesses; (2) Solving the problem of large straightness deviation: 1) Solving the problem of matching the disc shear: the upper blade sleeve of the disc shear is Ø317~318mm, the hydraulic nut pressure is 250~300kg, and the disc shear blade gap error is controlled below 0.01mm; 2) Solving the problem of uneven steel strip operation Stability issues: The correction roller pressing structure is a screw-type horizontal synchronous pressing, and the pressing pressure is increased to 100~120kg. Two conditions must be met for normal production: Condition 1: The tension roller at the exit of the disc shear must be pressed down; Condition 2: The material is fed through the entire clamping roller, the steel belt is fed by the No. 1 clamping roller of the cutting shear to the guide roller of the coiler, the No. 1 clamping roller is opened, and the tail clamping roller is pressed down to feed the material onto the coil; 3) Optimize the measurement mode: Take two steel plates with a length of 2-2.5m from the tail of each coil for splicing measurement, and control the straightness within 0~0.05mm.

[0006] (1) For materials of different thicknesses, different tension leveling machine parameters are adopted: for thicknesses of 0.4~2.0mm, the meshing depth adjustment range of No.1 straightening roll is 15~20mm, the meshing depth range of No.2 bending roll is 8~10mm, the meshing depth of No.3 bending roll is 7.5-8.5mm, and the elongation parameter is 0.5-1%; the tension of the coil produced by the cold rolling mill is set at 30-50KN, and the tension of the coil produced by other annealing and pickling is set at 90-120KN, and the edge waviness of the product is ≤1mm.

[0007] The beneficial effects of this invention are: 1. By establishing a plate straightening control scheme, it can guide the selection of stainless steel straightening equipment for refrigerated container panels, optimize the process and operation, clarify the key points of straightness defect control, and ensure that the straightness is <0.05mm.

[0008] 2. By standardizing the process of the straightening machine and selecting the blades and shear sleeves of the disc shear, it can be ensured that the strip steel is effectively deformed, remains stable during the shearing process, and the camber is eliminated.

[0009] After adopting the method of the present invention, the problem of stainless steel plate shape and straightness of refrigerated container panels was successfully solved, and the pass rate of plate shape and straightness was increased from 70% to 100%.

[0010] This invention is mainly used for the straightening and control of the shape and straightness of stainless steel panels in refrigerated containers, effectively solving the problem of low straightness pass rate. It reduces the cost of quality disputes caused by straightness discrepancies, is highly operable, and can be extended to other high-precision panel materials such as airport roof panels. Detailed Implementation

[0011] 1. Solve the problem of work hardening edge waviness generated during the rolling process: For materials of different thicknesses, the following table is used to design the parameters of the tension leveler.

[0012]

[0013] Based on the processing method of the pre-processing steps of refrigerated container materials, the tension parameters are not used for straightening. For the production of coils from the cold continuous rolling mill, the tension is set to 30-50KN; for the production of coils from other annealing and pickling processes, the tension is set to 90-120KN.

[0014] By fixing the parameters, the edge wave is controlled within 0~1mm.

[0015] 2. Solve the problem of large straightness deviation: (1) Solve the problem of matching the disc shear: The blade sleeve of the disc shear was adjusted from Ø315mm to Ø317.4mm, and the hydraulic nut pressure was adjusted from 150kg to 300kg, which ensured the stable operation of the steel strip in the disc shear and controlled the gap error of the disc shear blade to below 0.01mm.

[0016] (2) Solving the problem of unstable steel strip operation: Improvements were made to the correction roller and the pressure roller after the disc shear. The pressing structure of the correction roller was changed from a hydraulic cylinder to a screw-type horizontal synchronous pressing, and the pressing pressure was increased from 60kg to 100kg. The secondary system control program was modified to require two conditions to be met simultaneously for normal production: A. The tension roller at the exit of the disc shear must be pressed down; B. The entire process is fed by the pinch rollers, the No. 1 pinch roller of the slitting shear feeds the steel strip to the guide roller of the coiler, the No. 1 pinch roller is opened, and the tail pinch roller is pressed down to feed the material onto the coil. This solved the problem of unstable steel strip operation, and the camber was significantly reduced, controlled to 0.01mm / m.

[0017] (3) Optimize the measurement mode: Optimize the measurement mode, take two 2.5m long steel plates from the end of each roll of material for splicing measurement, and make a matching inspection platform (a 2m (width) * 5m (length) * 0.3m (height) iron platform with a smooth and level surface. After the steel plate is sampled, it is placed on the platform to measure the plate shape data). The straightness is controlled within 0~0.05mm. Example

[0018] 1. The SUNWIG tension leveling machine produces a roll of 0.8*1219mm 400 series steel grade 2B plate. The diameter of the blade sleeve on the disc shear is Ø317.4mm, the hydraulic nut pressure is 300kg, the straightening roller pressure is 100kg, the gap between the upper and lower shear blades of the disc shear is adjusted to 0.08mm, the tension of the tension leveling machine is 110KN, and the reduction is 20 / 10 / 8. The edge waviness of the plate is 0.03mm, and the straightness is 0.02mm / m.

[0019] 2. The SUNWIG tension leveling machine produces a 1.2*1219mm roll of 400 series steel 2D plate. The diameter of the blade sleeve on the disc shear is Ø317.6mm, the hydraulic nut pressure is 300kg, the straightening roller pressure is 100kg, the gap between the upper and lower shear blades of the disc shear is adjusted to 0.12mm, the tension of the tension leveling machine is 100KN, and the reduction is 15 / 8 / 8. The edge waviness of the plate is 0.05mm, and the straightness is 0.02mm / m.

[0020] The above description is only a specific embodiment of the present invention, but the structural features protected by the present invention are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present invention are covered by the patent scope of the present invention.

Claims

1. A method for controlling the shape of stainless steel tensioning plates in refrigerated container panels, characterized in that: Including the following aspects: (1) Solve the problem of work hardening edge waviness generated during the rolling process: For materials of different thicknesses, adopt different tension leveler parameters: for thickness 0.4~2.0mm, the meshing depth adjustment range of No.1 straightening roll is 15~20mm, the meshing depth range of No.2 bending roll is 8~10mm, the meshing depth of No.3 bending roll is 7.5-8.5mm, and the elongation parameter is 0.5-1%; the tension of the coil produced by the cold continuous rolling mill is set at 30-50KN, and the tension of the coil produced by other annealing and pickling is set at 90-120KN, and the edge waviness of the product is ≤1mm; (2) Solving the problem of large straightness deviation: 1) Solving the problem of matching the disc shear: the upper blade sleeve of the disc shear is Ø317~318mm, the hydraulic nut pressure is 250~300kg, and the disc shear blade gap error is controlled below 0.01mm; 2) Solving the problem of unstable steel strip operation: the correction roller pressing structure is a screw-type horizontal synchronous pressing, and the pressing pressure is increased to 100~120kg. Two conditions must be met to ensure normal production: Condition 1: the tension roller at the exit of the disc shear must be pressed down; Condition 2: the entire process of the pinch roller feeds the strip, the cutting shear No. 1 pinch roller feeds the steel strip to the guide roller of the coiler, the No. 1 pinch roller is opened, and the tail pinch roller is pressed down to feed the material onto the coil; 3) Optimizing the measurement mode: take 2 steel plates with a length of 2-2.5m from the tail of each coil for splicing measurement, and control the straightness within 0~0.05mm.

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