Method for eliminating annealing white spot on edge of cold-rolled aluminum coil

An annealing and aluminum coil technology, applied in the field of aluminum alloy heat treatment, can solve problems such as white spot defects in aluminum coils, and achieve the effect of reducing the air entering the gap between layers, reducing the reaction between aluminum and oxygen, and reducing the gap between layers

Active Publication Date: 2020-12-01
GUANGXI LIUZHOU YINHAI ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The problem to be solved by the present invention is to provide a method for eliminating the annealing white spots on the edges of cold-rolled aluminum coils, so as to solve the problem of white spot defects on the edges of the existing aluminum coils during the complete annealing process

Method used

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  • Method for eliminating annealing white spot on edge of cold-rolled aluminum coil
  • Method for eliminating annealing white spot on edge of cold-rolled aluminum coil
  • Method for eliminating annealing white spot on edge of cold-rolled aluminum coil

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Embodiment 1

[0023] The method for eliminating the annealing white spots at the edge of cold-rolled aluminum coils is to process aluminum coil 1, alloy 1235, thickness 4.0mm, and width 1350mm, including the following steps:

[0024] A. Before complete annealing, the aluminum coil rolling pass; the actual convexity is controlled at 0;

[0025] B. Control the coiling tensile stress before annealing at 25MPa;

[0026] C. Make a steel strip at 40mm on both sides of the aluminum coil;

[0027] D. Then perform annealing. The annealing furnace gas temperature is 550°C and the material temperature is 500°C. After 5 hours of heat preservation, the program stops and cools with the furnace. Turn off the blowing and washing fans and negative pressure fans, and open the side cooling system. When the material temperature drops below 150°C Time to release. After cooling to room temperature, the book was opened for inspection, and no annealed white spots were found.

Embodiment 2

[0029] The method for eliminating the annealing white spots at the edge of cold-rolled aluminum coils is to process aluminum coil 2, alloy 5052, with a thickness of 1.17 mm and a width of 1350 mm, including the following steps:

[0030] A. Before complete annealing, the rolling pass of aluminum coil; the actual convexity is controlled at 0.2%;

[0031] B. Control the coiling tensile stress before annealing at 50MPa;

[0032] C. Make a steel strip at 120mm on both sides of the aluminum coil;

[0033] D. Then carry out annealing. The gas temperature of the annealing furnace is 380°C, and the material temperature is 320°C. After 3 hours of heat preservation, the program stops, the blowing and washing fans and negative pressure fans are turned off, and the side cooling system is turned on. The material temperature drops to 200°C before being released from the furnace. After cooling to room temperature, the book was opened for inspection, and no annealed white spots were found.

Embodiment 3

[0035] The method for eliminating the annealing white spots at the edge of cold-rolled aluminum coils is to process aluminum coil 2, alloy 5052, with a thickness of 1.17 mm and a width of 1350 mm, including the following steps:

[0036] A. Before complete annealing, the rolling pass of aluminum coil; the actual convexity is controlled at 0.1%;

[0037] B. Control the coiling tensile stress before annealing to be above 35MPa;

[0038] C. Make a steel strip at 80mm on both sides of the aluminum coil;

[0039] D. Then perform annealing. The temperature of the annealing furnace gas is 450°C, and the material temperature is 450°C. After 3 hours of heat preservation, the program stops, the blowing and washing fans and negative pressure fans are turned off, and the side cooling system is turned on. The temperature of the material drops to 175°C before being released from the furnace. After cooling to room temperature, the book was opened for inspection, and no annealed white spots w...

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Abstract

The invention discloses a method for eliminating an annealing white spot on a cold rolled aluminium crimped edge and relates to the technical field of aluminium alloy heat treatment. The method comprises the following steps: A, before full annealing, conducting aluminium coil rolling pass, wherein the actual degree of convexity is controlled to 0-0.2%; B, controlling a coiling tensile stress before annealing to more than 25 MPa; C, respectively punching a steel belt in 40-120 mm parts of two edges of the aluminium coil; and D, conducting annealing, furnace cooling, turning off a blowing draught fan and a negative pressure draught fan, turning on a side cooling system and then drawing a charge when a material temperature is reduced to below 200 DEG C. Compared with the prior art, the methodcan solve the problem that the white spot defect is occurred on the edge of the existing aluminium coil in the full annealing process.

Description

technical field [0001] The invention relates to the technical field of heat treatment of aluminum alloys, in particular to a method for eliminating edge annealing white spots in the complete annealing process of an aluminum coil. Background technique [0002] In the production process of aluminum alloy, since complete annealing can eliminate work hardening, restore the material to its original state, and obtain O state, it is often necessary to perform complete annealing, and then perform corresponding cold deformation after complete annealing to obtain the corresponding state and performance . For example, the production of 1235 alloy aluminum foil blanks with a thickness of 0.25 mm and a state of H14 often requires complete annealing at a thickness of 0.5 mm to 0.6 mm, and then undergoes a cold deformation of 50% to 58% to obtain the state of H14. For another example, to produce a 5052 alloy sheet with a thickness of 1 mm and a state of H32, complete annealing in the thic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/04
CPCC22F1/04
Inventor 蒙春标赵明伟张伟付平黄成安陈兴旺庞凤彭响娥
Owner GUANGXI LIUZHOU YINHAI ALUMINUM IND
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