METHOD FOR FORMING FASTENING COLLAR, AND FLANGE JOINT

摘要

The invention relates to a method for forming a fastening collar that is essentially perpendicular to the longitudinal direction of a tubular piece to the end of the tubular piece, the method comprising forming the fastening collar to the end of the tubular piece (1) by shaping the end of the tubular piece in a first step by means of a first rotatable shaping head and a counter-surface to a first angle, and in a second step by means of a second rotatable shaping head (8) and a counter-surface to a second angle. The outer-most end of a flange part of the tubular piece shaped in the first step is shaped in the second step in such a manner that only part of the flange part formed in the first step is shaped into a support surface (7) that is essentially perpendicular to the longitudinal axis (L) of the tubular piece (1). The invention also relates to a flange joint, in which fastening collars produced by the method are used.

主权项

1. A method for forming a fastening collar that is essentially perpendicular to the longitudinal direction of a tubular piece to the end of the tubular piece, the method comprising forming the fastening collar to the end of the tubular piece (1) by shaping the end of the tubular piece in a first step by means of a first rotatable shaping head (2) and a counter-surface to a first angle, and in a second step by means of a second rotatable shaping head (8) and a counter-surface to a second angle, characterised in that the outermost end of a flange part of the tubular piece shaped in the first step is shaped in the second step in such a manner that only a section of the flange part formed in the first step is shaped into a support surface (7), which is essentially perpendicular to the longitudinal axis (L) of the tubular piece (1), and that the surface of a tightening flange (3) used in forming the joint between the tubular pieces is used as a stop face in the shaping.