| 摘要 |
<p>The invention relates to a procedure and an apparatus for forming a rectangular collar at the end of a pipe (16) by shaping it by means of a forming element (8) which is moved in the axial direction of the pipe (16) towards the pipe (16) and rotated along the edge surface of the pipe end about the longitudinal axis of the pipe. In the procedure, a conical collar is first produced, whereupon the forming element (8) is moved in the axial direction of the pipe away from the pipe (16) and turned to a position where its forming face is substantially perpendicular to the longitudinal axis of the pipe, whereupon a rectangular collar is formed. The apparatus of the invention is provided with turning means (15) allowing the forming element to be turned about its fulcrum (9) into a first position, where the surface of the forming element is at an acute angle to the direction of the longitudinal axis of the pipe and the forming element (8) is supported by a first bearing surface (13), and into a second position, where the surface of the forming element is substantially perpendicular to the direction of the longitudinal axis of the pipe and the forming element (8) is supported by a second bearing surface (14). <IMAGE></p> |
