Abstract: The invention relates to a method for forming a fastening collar. A fastening collar is formed to the end of the tubular piece 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 and a counter-surface to a second angle. The outermost end of a flange part 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 that is perpendicular to the longitudinal axis of the tubular piece.

Abstract: 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.

Abstract: The invention relates to a flange joint, comprising a pair of tubular pieces (1, 7) to be joined, a clamping flange (2, 9) mounted on each of the pieces (1, 7) to be joined, retaining means (10, 11) cooperating with the clamping flanges (2, 9) for joining said pieces (2, 7) together. At least one (2) of the clamping flanges is mounted in a rotation allowing manner on the respective piece (1) to be joined by effecting the mounting with a locking ring (3) fitted in a locking groove (4) formed in the piece (1) to be joined and in a complementary groove (5) formed in the clamping flange (2). The piece (1) to be joined has its locking groove (4) shaped to be relatively shallow and the clamping flange (2) has its complementary groove (5) shaped to extend in the clamping flange's axial direction up to a front face (14) of the clamping flange, the complementary groove (5) expanding towards a junction between the pieces to be joined.

Abstract: A procedure and an apparatus for forming a rectangular collar at the end of a pipe (34) by shaping it includes a forming element (1) which is moved in the axial direction of the pipe towards the pipe and rotated along the interior surface of the pipe end about the longitudinal axis of the pipe. The forming cone (1) is moved in the axial direction of the pipe towards the pipe so that, as it moves towards the pipe, the forming element (1) is automatically turned from an initial position to a final position by the thrust producing the movement, simultaneously forming the pipe end so as to produce a collar substantially rectangular with respect to the direction of the longitudinal axis of the pipe.

Abstract: A procedure and an apparatus for forming a rectangular collar at the end of a pipe (16) shape the pipe using 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.

Abstract: A method and device are disclosed for forming the end of a metal pipe into a collar substantially perpendicular to the longitudinal axis of the pipe. The method involves spreading the pipe end into a position perpendicular to the longitudinal direction of the pipe in two or more stages. The device includes an auxiliary head of conic form for spreading the pipe end into a collar substantially perpendicular to the longitudinal axis of the pipe, the auxiliary head being mounted in the device after the pipe end has been spread in a first stage to an angle differing from 0.degree. relative to the longitudinal direction of the pipe. The auxiliary head is so arranged that the working surface of the auxiliary head, when pressed against the pipe end, is substantially perpendicular to the longitudinal direction of the pipe.

Abstract: The invention relates to a joint for a pipe provided with a flared end. An internal supporting surface (4) of a tightening flange (3) makes contact with the outside of the pipe flare (2), a supporting surface (6) of an insert piece (5) makes contact with the inside of said flare (2). In order to improve the grip of the pipe flare (2), the inside of the tightening flange is provided with a rounded shoulder (7) and the insert piece, correspondingly, with a notch (8), whereby deformation of the pipe material is achieved in adjustment according to the form of the shoulder (7) of the tightening flange.