| 摘要 |
A method of forming a tubular workpiece which consists in pre-bending a metal plate along at least two longitudinal lines of bend ( 12-13 ) then in bending the plate along at least one of the lines of bend ( 12-13 ) using a bending member ( 103-104 ) that exerts an external clamping force (F<SUB>7</SUB>, F<SUB>8</SUB>) along a part ( 23, 24 ) of the plate towards the at least one of the lines of bend ( 12, 13 ). Thereby preventing any sliding of part ( 23, 24 ) of the plate along the bending member ( 103-104 ) as the bending member bends the part. The bending member is articulated about a virtual geometrical axis (a, c) located inside a tubular section of the workpiece.
|
