Nippon Steel Corporation

Seiichi Nagasoe

Taneharu Nishino

Kanichi Kishikawa

Kazuo Watanabe

Hideki Tokita

The rail is rolled by the steps of breakdown rolling, reforming rolling, first and second universal rolling, head-wheel rolling and base-wheel rolling in that order. The reforming rolling is performed using a pair of horizontal rolls provided with a reforming pass and a head-wheel pass and a vertical roll adapted to reduce the base of the rail, with the paired horizontal rolls, together with said vertical roll, shifted and set in such a position where the reforming pass matches the pass line of the first universal rolling pass. The head-wheel rolling is performed using the same paired horizontal rolls and a vertical roll adapted to reduce the head of the rail, with the paired horizontal rolls, together with said vertical roll, shifted and set in such a position where the head-wheel pass matches the pass line of the second universal rolling pass. The rail rolling apparatus comprises a breakdown stand, a sizing head-wheel stand having a pair of horizontal rolls provided with a reforming pass and a head-wheel pass, a vertical roll adapted to reduce the base of the rail, a vertical roll adapted to reduce the head of the rail, and mechanism for shifting the rolls, a universal stand, and a base-wheel rolling stand.

Method and apparatus for rolling rails

A method for rolling a steel section having flanges or flange-like portions from a steel bloom of rectangular cross section in a rolling mill having a train of roughing rolling stands for roughing, a universal rolling stand with a pair of opposing horizontal rolls and a pair of opposing vertical rolls, and a train of finishing rolling stands for finishing. The method includes rolling the bloom in the train of roughing rolling stands for roughing to a rough shape having a width greater than the shortest distance between the outer circumferences of the opposed vertical rolls in the universal rolling stand and having a reduced almost flat cross section including a portion to be shaped into flanges or flange-like portions in the final product, rolling the rough shape of flat cross section thus obtained in the universal rolling stand for causing the pair of vertical rolls and the pair of horizontal rolls to cooperatively give bending deformation mainly to the portions to be shaped into the flanges or flange-like portions, and finish rolling the rough shape produced from the bending deformation in the finishing rolling stands for finishing.

Growing community of inventors

Munakatamachi, Japan

Seiichi Nagasoe