To provide a scrap cutting method for a side trimmer, which is carried out in a manner flexibly coping with difference or fluctuation of the production ratio at every plate thickness, and brings about a minimum frequency of exchange of shearing knives, and to provide a scrap cutting device for the side trimmer.
According to the scrap cutting method, when a trimming scrap 25 delivered from the side trimmer 3 along a scrap guide 4 is cut into short-length pieces by the shearing knives 6 of each cutting rotor 5, two or more cutting zones 8 are set in each shearing knife 6 in a width direction, and by moving the cutting rotors 5 in a direction of a rotation axis, an applicable cutting zone 22 in which the trimming scrap 25 is cut can be selected from the cutting zones 8. Further, the plate thickness of a metal band 1 is sorted into two or more plate thickness ranges, and the applicable cutting zone 22 is successively moved upon occurrence of defective cutting at every plate thickness range. The scrap cutting device is for use in the scrap cutting method.
KIHARA SHIGERU
HAJIMA YOJI
NITTETSU PLANT DESIGNING CORP
Hisataka Tanaka