HC six-roller mill middle roller body end chamfer grinding method

Abstract

The invention discloses an HC six-roller mill middle roller body end chamfer grinding method. The method comprises roller body end chamfer structural design and a roller body end chamfer grinding process. In the roller body end chamfer structural design, a roller body end chamfer is designed to be R (3000-5000mm)*(80-120mm), and the unilateral drop is 1-1.5mm; or the roller body end chamfer is designed to be (20-50 degrees)*(30-70mm)+R(800-1200mm)*(30-70mm). In the grinding method, by optimally designing the HC six-roller mill middle roller body end chamfer structure and developing the grinding process matched with the structure, the problem of stress concentration produced by extrusion of a high-hardness working roller on the edge of a low-hardness middle roller can be avoided, therefore,the invalidation problems such as end ring cracking and stripping caused by the fact that the middle roller bears contact fatigue stress in the using process are solved, and abnormal loss of the middle roller is reduced.

Description

technical field [0001] The invention belongs to the technical field of intermediate rolls of HC six-high rolling mills, and in particular relates to a method for chamfering and grinding the ends of intermediate rolls of HC six-high rolling mills. Background technique [0002] The HC six-high mill mainly realizes the control of the strip shape through work roll bending / transverse roll shifting of intermediate rolls, work roll bending, and intermediate roll bending. Roll bending and roll shifting technology can well solve the problem of shape quality control, but it is followed by high requirements on the overall performance of the roll. [0003] Since the contact stress distribution state between the rolls is always in a dynamic process, and the hardness of the intermediate roll is lower than that of the work roll, it will be pressed by the high-hardness work roll during the rolling process, resulting in contact fatigue and stress concentration. However, if the edge of the m...

AI Technical Summary

Problems solved by technology

However, if the edge of the middle roll body bears a large contact stress, it will cause peeling or ring cracking at the end of the middle roll body

Premature peeling or ring cracking of the intermediate roll will not only easily cause rolling accidents, but also lead to the direct scrapping of the intermediate roll, which will have adverse effects on both safety and economy

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