| 摘要 |
PURPOSE:To perform the forming of the strip steel center part without changing a roll by pressing the end bending part of a strip steel by the pair of sizing rollers having the involute curve in cross sectional shape and changing the roll gap and abutting direction is accordance with the forming stage. CONSTITUTION:The roll surface based on the necessary involute curve is formed on a side roll 9 so as to coincide with the center part curve of the strip steels 30, 31 having different plate widths and bend end parts. The forming device forms the center part of the strip steels 30, 31 in the prescribed shape by changing the gap of rolls 9, 9, the rolling reduction direction and abutting direction according to the center part bending stage by locating each rolls 9, 9 and the upper and medium rolls 10, 10 to both end parts and center part of the strip steels 30, 31 in the necessary width. The rolls 10, 10 perform the forming by changing the roll gap and vertical direction position adequately. In this way the center part of the strip steel having a bent end part can be formed without roll changing.
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