| 摘要 |
A stretch roll forming apparatus (10) has multiple roll forming stations (12, 14, 16, 18, 20, 40, 22) arranged serially so that a sheet metal workpiece (24) can be advanced through the stations in sequence. Each station includes a pair of roller dies supported by an inboard support station (30, 40) and by an outboard support station (32, 42), in spaced apart relationship, so that the roller dies are each rotatable about a horizontal axis. The roller dies are configured to shape a sheet metal workpiece which is advanced between them. At least one of the roll forming work stations is a stretch roll forming work station (40). In this station, the roller dies (44, 46) each have a frusto-concial shape. The roller dies are positioned such that the taper of one extends from the inboard support to the outboard support while the taper of the other extends from the outboard support to the inboard support. When a sheet metal workpiece (24) is advanced between the roller dies (44, 46) of the stretch roll forming station (40), one longitudinal edge of the workpiece is stretched relative to the other longitudinal edge. This gives the workpiece a longitudinal curvature.
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