Connecting method for endless-rolled intermediate billets of hot-rolled strip steel

Abstract

The invention discloses a connecting method for endless-rolled intermediate billets of hot-rolled strip steel, which belongs to the technical field of hot-rolled strip steel; and the connecting method comprises the following steps: cutting heads and tails: utilizing a shearing machine to cut the heads and tails of the intermediate billets after rough rolling, causing the intermediate billets to form straight end surfaces of the heads and the tails, and aligning the head and tail end parts of the front and back intermediate billets; pressing teeth: utilizing a pressing machine to press the teeth on the opposite surfaces of the end parts of the front and back intermediate billets, thus forming tooth-shaped regions on the opposite surfaces of the end parts of the front and back intermediate billets; lapping: oppositely lapping the tooth-shaped region at the tail of the front intermediate billet with the tooth-shaped region of the back intermediate billet together; and pressing: utilizingthe pressing machine to press the end parts of the front and back intermediate billets together. The method has the following advantages: process equipment is simple, the connection strength is high,the connection speed is fast, and the range of application is wide; and the method can not only be used for construction of newly-built continuous hot-rolled strip production lines, but also be used for transformation of the existing continuous hot-rolled strip production lines.

Description

technical field [0001] The invention relates to a method for connecting a hot-rolled strip steel endless rolling intermediate billet, in particular to a method for connecting a hot-rolled strip steel endless rolling intermediate billet by means of crimping, and belongs to the technical field of hot-rolled strip steel. Background technique [0002] Hot-rolled strip endless rolling technology is one of the most advanced technologies in the world's steel production. It can connect several rough-rolled intermediate billets and continuously enter the finishing rolling unit for continuous and stable rolling. , and is stably cooled and phase-transformed by the laminar cooling line, and finally cut by flying shears and coiled into multiple hot-rolled strip coils by a coiler. Compared with conventional rolling, endless rolling can significantly increase production efficiency and yield, improve strip threading performance, reduce roll consumption, and realize stable production of new ...

AI Technical Summary

Problems solved by technology

At the same time, the temperature of the connection zone is higher than that of other parts of the strip, and its strength is also lower than other regions. Therefore, the connection zone becomes a weak link in the endless rolling process, and it is easy to produce broken strips.

[0006] The laser heating joining method is a joining technology adopted by Nippon Steel. Compared with the induction heating joining method, it can eliminate the existence of unjoined parts, but there are still problems that the temperature of the joint part is higher than other parts, and the applicable steel types are limited; and the laser The required power is very large, which significantly increases equipment and production costs

Images