Method of continuously hot rolling steel pieces

B - Operations – Transporting – 21 – B

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B21B 15/00 (2006.01) B23D 15/00 (2006.01) B23D 25/12 (2006.01)

Patent

CA 2199872

A stable continuous hot rolling method which extremely lessens dislocation produced upon application of a high frequency induction heating of the transverse type for joining billets and eliminates plate breakage by individually cutting a rear end of a leading billet and a front end of a trailing billet by means of two pairs of cutting blades, one pair of which is arranged such that front faces of the blades are opposite in direction to each other on both sides of the billet and the other pair of which is arranged such that front faces of the blades are reversed in direction to those of the blades of the one pair, while conveying the respective billets in the same direction when the rear end of the leading billet and the front end of the trailing billet, respectively, are cut by means of drum shears which vertically interpose therebetween the rear end and the front end and are provided at outer peripheries thereon with cutting blades, and the respective ends are fed to a rolling mill to be continuously subjected to hot finished rolling after they are heated trough high frequency induction heating to be raised in temperature and pressed against each other to be joined.

Ce procédé de laminage à chaud continu et constant réduit considérablement les dislocations survenant lors d'un échauffement par courant de Foucault à haute fréquence appliqué transversalement pour fusionner des lingots, et élimine les ruptures de plaques en permettant de découper séparément la partie arrière d'un lingot avant et la partie avant d'un lingot arrière à l'aide de deux paires de lames de coupe. La première paire est conçue de sorte que les faces avant de ses lames soient opposées l'une à l'autre de chaque côté d'un lingot et la deuxième paire de sorte que les faces avant de ses lames soient orientées dans la direction inverse de celles des lames de la première paire, les lingots avançant dans la même direction quand l'extrémité arrière du lingot avant et l'extrémité avant du lingot arrière sont chacune coupées par des cisailles à tambour, s'interposant verticalement entre ces deux extrémités et dotées sur leurs périphéries de lames de coupe. Ces extrémités sont dirigées vers un laminoir et soumises en continu à un laminage à chaud de finissage après avoir été échauffées par courant de Foucault et pressées l'une contre l'autre pour être fusionnées.

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