Electric heating – Inductive heating – Metal working
Patent
1995-02-15
1998-05-19
Leung, Philip H.
Electric heating
Inductive heating
Metal working
219603, 219614, 219651, 219659, 228151, 228158, 2282352, 72203, H05B 602, B23K 2004
Patent
active
057538948
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a continuous hot rolling method of metal blocks for butt-joining a preceding metal block and a succeeding metal block and continuously performing a hot finish rolling, as well as a metal blocks joining apparatus, a table roller conveyor, a poor joined portion removing apparatus and a metal blocks cooling apparatus which are directly used to carry out such method.
BACKGROUND ART
Conventionally, in hot rolling lines of metal blocks comprised, for example, of steel, aluminum, copper and the like, the metal blocks to be rolled are heated, rough rolled and finish rolled one by one, so as to be finished into a plate having a predetermined thickness. Such a rolling system suffers from disadvantages that a poor threading of the rolled material in the finish rolling inevitably causes the line to stop, and a poor shape of fore end portion and rear end portion of the rolled material results in a low yield.
Therefore, it is a recent trend to carry out an endless rolling in which the metal blocks to be rolled are connected at the fore end and rear end portions thereof prior to the finish rolling and continuously conveyed to the hot rolling line. As prior art in this connection, various proposals are disclosed, for example, in Japanese Patent Application Laid-Open Nos. SHO-58-112601, SHO-60-244401, SHO-61-159285, SHO-61-144203, SHO-62-142082, SHO-62-234679, HEI-4-84609, HEI-4-89120, HEI-5-185109, etc.
According to a general practice, the regions of the metal blocks in the vicinity of their respective end portions are clamped and supported by clamps on the inlet side of the rolling equipment and the to-be-joined portion is heated to an elevated temperature and pressed and joined by heating means as the endless rolling of the metal blocks is performed. However, in joining the metal blocks which are passed through the abovementioned processes, there still remain various disadvantages such as those described below, in connection with which there have been demands for improvements. the opposite end portions of the blocks and press them with each other. As shown in FIG. 1, the respective end portions of the preceding metal blocks 1 and the succeeding metal blocks 2 are applied with an alternating magnetic field in the direction of thickness, for example, by heating means 3 such as an induction heating coil. When such end portions are heated to an elevated temperature in a short time, even if the metal blocks are fixed and held by clamps, the end portions may shift vertically upon heating and pressing of the metal blocks. That is to say, the joined portion of the metal blocks reaches 1,300.degree.-1,500.degree. C. in temperature and may be partly melted. Such melted portion has a decreased friction coefficient at the joining interface so that even a slight lack of uniformity in the pressing state may result in a vertical shifting of the plates. This may cause either formation of dissatisfactory joining as shown in FIG. 2 or occurrence of buckling. Thus, when the rolling is performed in such a condition, as shown in FIG. 3, the joined portion of the metal blocks may tilt down when it is bit into the rolls, and deformed and threaded into the base plate of the metal blocks, thereby giving rise to formation of excessively thin portions according to an increased number of rolling passage and a resultant breakage of the the plate during the rolling. constructed such that a carriage movable on a conveying line of the metal blocks is provided with clamps for fixing the metal blocks, heating means (e.g., an induction heating coil) for heating the metal blocks to an elevated temperature, and pressing means for pressing the end portions of the metal blocks with each other. In this instance, it has been a general practice to cause the heating means to approach the metal blocks only in the use condition and maintain it off the line except during the heating, and such a practice proved to be free from problems. However, the clamps and the pressing means remain mounted on the carriage and hence lo
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Amagasa Toshiaki
Hayashi Kanji
Hirabayashi Takeshi
Isoyama Shigeru
Kuroda Akio
Kawasaki Steel Corporation
Leung Philip H.
Mitsubishi Jukogyo Kabushiki Kaisha
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