Title

"HC MILL" Seus princípios e aplicações

"HC MILL" Seus princípios e aplicações

Authorship

Kajiwara, Toshiyuki

Kajiwara, Toshiyuki

I am this author

DOI

10.5151/2594-5297-262

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Abstract

The HC mill (High Crown Control Mill) is a new type of mill aimed at drastically improving performance to control the shape (flatness) of strip in strip rolling, resulting in the improvement of plant and operational efficiency. The HC mill is a 6-high mill in which upper and lower intermediate rolls between the work rolls and backup rolls are positioned so as to shift in their respective axial directions, opposite to each other. Several HC mills are already in operation for ferrous and non-ferrous strip rolling, including two large-scale reversing HC mills. One of them was revamped from a 4-high mill, and the other claims the world's highest rolling speed (1,200 m/min) as a reversing mill. Additionally, a 6-stand tandem cold strip mill with the world's highest rolling speed (2,500 m/min) has been revamped in the last stand from a 4-high mill to an HC mill. Through the actual operation of those HC mills, good shape controllability and other advantages have been confirmed, as well as full reliability for commercial operation. Moreover, new applications and techniques of this mill for strip rolling have been examined and developed, which could never have been expected for conventional mills. This paper describes the principles, shape controllability, and other advantages, operating data, and applications of the HC mill in cold rolling and skin pass rolling.

The HC mill (High Crown Control Mill) is a new type of mill aimed at drastically improving performance to control the shape (flatness) of strip in strip rolling, resulting in the improvement of plant and operational efficiency. The HC mill is a 6-high mill in which upper and lower intermediate rolls between the work rolls and backup rolls are positioned so as to shift in their respective axial directions, opposite to each other. Several HC mills are already in operation for ferrous and non-ferrous strip rolling, including two large-scale reversing HC mills. One of them was revamped from a 4-high mill, and the other claims the world's highest rolling speed (1,200 m/min) as a reversing mill. Additionally, a 6-stand tandem cold strip mill with the world's highest rolling speed (2,500 m/min) has been revamped in the last stand from a 4-high mill to an HC mill. Through the actual operation of those HC mills, good shape controllability and other advantages have been confirmed, as well as full reliability for commercial operation. Moreover, new applications and techniques of this mill for strip rolling have been examined and developed, which could never have been expected for conventional mills. This paper describes the principles, shape controllability, and other advantages, operating data, and applications of the HC mill in cold rolling and skin pass rolling.

Keywords

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