A method to reduce the surface fold and stick damage of aluminum coil due to the thickness jump of the head coil diameter

Abstract

The invention discloses a method for reducing the surface folding and bonding damage of an aluminum coil caused by head coiling diameter thickness deviation. When a hot-rolled aluminum coil with a finished product thickness of more than or equal to 6.0mm is rolled, the head of an aluminum strip is pressed and thinned to be less than 6mm, and time for enlarging a roll gap to a roll gap with a set thickness is calculated according to the length of the aluminum strip machined by each rolling mill. The method has the beneficial effects that the head position of the aluminum strip is pressed and thinned in an aluminum strip rolling process, and a thickening deformation area of the aluminum strip is machined into an abrupt thickness change-free wedge-shaped area, so that abrupt thickness changes are avoided, the problem of dents or folding caused by the excessive thickness of the head of the aluminum coil can be effectively solved, and the finished product rate is greatly increased; moreover, additional hardware equipment is not required, and only a conventional program is required to be modified, so that the method is low in cost and high in practicability.

Description

technical field [0001] The invention relates to the technical field of metal pressure processing, and in particular relates to a method for reducing surface folding and sticking of an aluminum coil caused by a thick roll diameter at the head. Background technique [0002] With the rapid development of China's aerospace and railways, there is an increasing demand for high-precision aluminum strips. At present, the hot rolling aluminum industry is sacrificing the yield to ensure the high quality of aluminum strips. When making thick specifications, the step thickness of the head is prone to indentation or folding during the high-tension coiling process, especially for softer alloys, the length of indentation or folding is longer. Like this just needs to cut off the very long part of aluminum plate and strip of head as waste material, and the finished product rate reduces greatly. [0003] After analysis, it is found that: during the coiling process of the head of the aluminum...

AI Technical Summary

Problems solved by technology

When the thickness of the finished aluminum strip is H>6.0mm, the inner multi-turn aluminum strip of the hot-rolled aluminum coil will have obvious indentation and folding at the head position, and in the uncoiling and coiling process of the subsequent cold rolling process, These defects will be inherited and magnified, and eventually a large number of aluminum strips at the head of the aluminum roll will become waste due to surface sticking.

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