METHOD OF MANUFACTURING FLANGED PIPE

摘要

A flange (5) has a pipe insertion hole (8), and an engagement recess (10) is formed in the inner peripheral surface (9) of the pipe insertion hole (8) so as to extend in a region from an axially intermediate section of the pipe insertion hole (8) to the position of a connection surface (5a) of the flange (5). An end (2) of a pipe (1) is inserted into the pipe insertion hole (8) in the flange (5) such that an end surface (2x) of the pipe (1) is located in a range from the axially intermediate section of the pipe insertion hole (8) to the position of the connection surface (5a). Then, each die segment (21) of an expansion die (20) placed in the hollow (4) of the pipe (1) is moved outward in the radial direction of the pipe (1) to expand the end (2) of the pipe (1) so that the end (2) engages with the engagement recess (10). By this, the flange (5) is joined to the end (2) of the pipe (1).