| 摘要 |
In a method of forming a circumferentially extending groove (43) in a circular peripheral surface of a workpiece (44), particularly a pipe, the groove is formed by means of a tool (42) having at least two engagement means (47, 48) for co-operation with the workpiece, at least one of the engagement means comprising a groove- forming roller (48). The engagement means are pressed radially against the workpiece (44) so that the workpiece is clamped between them, and the tool (42) and the workpiece (44) are rotated relative to one another through an angle necessary for the groove forming roller (48) or rollers to describe a groove around the workpiece. The rotary movement is repeated while progressively decreasing the distance between the groove forming engagement means (48) and the centre of the workpiece until the groove is formed to the desired depth. <IMAGE> |
