PURPOSE: To provide a forming method of the flange coupling of a lining tube which can form a stub end in a simple process under a bulk processing after lining a resin layer on the inner surface of a metal tube, and does not reduce the strength of the flange coupling even though the thickness of the stub end is reduced.
CONSTITUTION: By compressing the tube end of a lining tube 10 in the tube longitudinal direction, the thickness of the layers near the tube end is increased, a loose flange 15 is inserted to the periphery of the lining tube 10 before or after the thickness increasing process, and after the diameter of the tube end is expanded by abutting a conical metal mold 3 from the end face side of the tube end after the thickness increasing process, a flat metal mold 4 is abutted from the end face side to the tube end, so as to obtain a stub end 13.
KAGOSHIMA EIICHI
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