Kawasaki Steel Corporation

Other

Kawasaki Steel Corporation Et Al.

Takahiro Yamasaki

Takeshi Hirabayashi

Shigeru Isoyama

Hideyuki Nikaido

Kanji Hayashi

Akio Kuroda

Kazuo Morimoto

Toshisada Takechi

Toshiaki Amagasa

Yoshiki Mito

Nozomu Tamura

Kazuya Tsurusaki

Hirosuke Yamada

Ikuo Wakamoto

Kunio Miyamoto

Norio Takashima

Hiroyuki Nakano

Junzo Nitta

Masashi Osada

Shuji Amanuma

Hideo Sakamoto

Michio Hashimoto

Toshinobu Eguchi

Fumihiro Maeda

Naohiko Ishibashi

Kazunori Nagai

Takashi Okai

Takushi Kagawa

The present invention eliminates the need to stop the operation of a line even when trouble arises before, during, or after an operation of joining metal blocks in hot rolling. According to a specific solving means of the present invention, when a succeeding metal block is to be subjected to hot finish rolling in succession to a preceding metal block after the leading end of the succeeding metal block is joined to a tail end B of the preceding metal block on the inlet side of a finish rolling mill , it is determined before and after joining whether or not endless rolling is impossible. When it is impossible, joining is aborted, and the succeeding metal block is temporarily stopped, is fed again after the tail end B of the preceding metal block moves out of the finish rolling mill , and is finish-rolled under the conditions set for batch rolling. When joining was not performed successfully, a joint is cut between a joining unit and the finish rolling mill , and the rolled material is bitten by the finish rolling mill set for batch rolling.

Method of hot-rolling metal pieces

Assuming that the processes of joining, rolling, coiling, etc. of a material is evaluated by a preset speed pattern after the extraction from a heating furnace, the required time is predicted and calculated for both of a preceding material and a following material. At the time when the following material can catch up with the preceding material at an aiming position on the line, the following material is extracted from the heating furnace according to the result of the above prediction calculation. Control is carried out so that both of the preceding material and the following material finish the process at a preset speed. Also, the traveling speed of the following material is controlled according to the position and the speed of the tail edge of the preceding material in a section close to the catch-up position so that a distance between the tail edge of the preceding material and the leading edge of the following material be closed. Thereby, three of the tail edge of the preceding material, the leading edge of the following material, and a movable joining apparatus are controlled at the aiming position on the hot rolling line so as to be in a positional relationship suitable for joining, by which the joining operation is completed properly in the travel zone of the joining apparatus.

Hot rolling method and equipment

According to the invention, the rear end of a preceding metal piece and a front end of a succeeding metal piece are heated, pressed and joined prior to the finishing hot rolling. An alternating magnetic field running through the metal pieces in the thickness direction thereof is generated in an end region on opposed faces of the respective metal pieces to perform heating. Another alternating magnetic field whose direction is reverse with respect to that of the former alternating magnetic field is partially generated in the end region on the opposed faces of the metal pieces and in either a region where the metal pieces exist or a region outside width ends of the metal pieces. This assures a uniform heating of the end region on the opposed faces of the metal pieces over their full width to reliably join the both metal pieces to each other.

Method and apparatus for joining metal pieces using induction heating

A method and apparatus for joining metal pieces wherein the rear end of a preceding metal piece and a front end of a metal piece are heated and then pressed together prior to hot finished rolling. The temperature the ends of the metal pieces are heated to is a temperature range between the solidus and liquidus line temperatures of the metal(s) to be joined.

Method of joining metal pieces

Method and apparatus for joining metal pieces

Method and apparatus for joining metal pieces using induction heating. Metal pieces to be joined are placed end-to-end with a gap between them and induction heated in the thickness portion. To maximize speed and even heating edge-to-edge of the ends, members of a magnetic substance are provided in a gap between the inductor and the piece to be heated, thereby enhancing local heating effect by increasing magnetic flux density. Once heated, the ends are pressed together end-to-end for joining.

An apparatus for joining metal pieces using induction heating. Preceding and succeeding metal pieces are followed by a carriage which carries an inductor. The inductor has the ability to move in the longitudinal direction of the metal pieces relative to the carriage to allow the inductor to move more or less upon the preceding or succeeding metal pieces to increase or decrease the induction heating effect, thereby taking into account any thickness variation of the metal pieces and yet still heating them evenly with regard to each other, prior to their being pressed against each other for joining before hot finishing rolling.

Apparatus for joining metal pieces using induction heating

Growing community of inventors

Chiba, Japan

Takahiro Yamasaki