To provide a method by which, when an end part of a material pipe is sealed upon manufacturing a hollow member for welding by applying hydroforming, the end part can be surely sealed so as not to cause leakage of a liquid for pressurization, and at the same time, an inclined groove face for welding is formed.
When sealing both ends of a material pipe by a pipe end sealing member serving also as a shaft pressing member, a sealing member having an insertion part having an outer diameter smaller than the pipe end inner diameter of the material pipe and having an inclined surface formed at a part to be abutted on an end face of the material pipe end is used as the pipe end sealing member. The insertion part of the pipe end sealing member is inserted into the pipe end of the material pipe, and pressurizing force in an axial direction is given to the pipe end sealing member. Thus, the pipe end of the material pipe is plastically deformed in a direction of filling a clearance between the outer peripheral surface of the pipe end and the projection part outer peripheral surface of the pipe end sealing member, the pipe end is sealed, and at the same time, an inclined groove face is formed on the end face of the pipe end.
MIZUMURA MASAAKI
| JPS3818966B1 |
Tadashi Takahashi
Sumio Tanai
Hiroshi Masui
Tomoo Katsumata
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