| 摘要 |
A roll forming apparatus having a plurality of roller die stands, through which a web workpiece is passed, for progressively forming edge flange bends and for subsequently forming side flange bends between the side flanges and the web, and having side flange corner forming upper dies which are mounted on angled spindles, and fit around the edge flanges and enter into the side flange corners, and further having side flange control rolls engaging the outer surface of the side flanges, the control rolls being movably mounted for tilting inwardly or outwardly, so as to produce a greater or lesser degree of bend between the side flanges and the web.
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