Forcedly stretching hole structure and stretching rolling method for rolling strip steel

Abstract

The invention discloses a force broadening pass structure used for strip rolling and a broadening rolling method thereof, and belongs to the technical field of steel rolling; the invention is used for solving the problem of increasing the broadening degree of the strip rolling. After improvement, the pass is composed of a wave curve outline part and a linear outline part of an upper roll and a lower roll, the wave curve camber of the upper and the lower rolls are uniformly corresponding to each other, and the linear outline part is positioned at the two ends of the wave curve. The broadening rolling method of the invention includes that a rolled piece is firstly broadened and rolled on the force broadening pass, then goes through flat rolling pass or flat roll rolling, the first pass of the flat rolling pass or the flat roll rolling is broadening rolling, and broadening rolling reduction is matched with the wave bending amplitude of the rolled piece in the first pass. By adopting the force broadening pass structure of the invention, the broadening degree can reach 100-150mm, thus achieving the aim of significantly increasing the broadening, degree and realizing that a wider strip steel can be rolled by a relatively narrow continuous casting slab. The force broadening pass structure of the invention is beneficial for widening products, increasing the efficiency of a mill, and leading strip production to be more flexible.

Description

technical field [0001] The invention relates to a roll pass and a rolling method, in particular to a forced widening pass structure for strip steel rolling and a rolling method using the pass, belonging to the technical field of steel rolling. Background technique [0002] Forced widening pass is a strip rolling technique that uses narrower billets to roll wider strips. In the production of narrow strips and medium and wide strips, the types of steel billets generally used are limited in width. How to roll wider strips requires the use of forced widening passes in rough rolling. At present, the forced widening pass is used in both narrow strip and medium wide steel production plants, for example: a single split wedge forced widening pass with a raised split wedge in the middle of the pass, during the rolling process Under the action of the split wedge, the material can flow to both sides, thereby increasing the amount of slab widening. This technology can use narrower bille...

AI Technical Summary

Problems solved by technology

However, according to the current rolling with split wedge pass, the amount of expansion is small, generally 20-30mm, and the maximum can reach 40-100mm

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