Fabrication method of tubular member
AssigneeHonda Motor Co., Ltd.
InventorsTakeshi Kiyama, Yuji Miki
Life of this patent
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Abstract
A part of a plate member is machined to remove material therefrom so as to obtain an intermediate product having a thickness difference. Then, the intermediate product is bent and both edges thereof are joined to obtain a cylindrical body. Further, a first heat treatment of heating the cylindrical body is performed. Then, through holes penetrating from the outside to the inside of the peripheral wall of the cylindrical body are formed. Pipe parts are joined to the tubular body thus obtained to form a tubular member. This tubular member is subjected to a second heat treatment.
Claims11
A fabrication method of a tubular member comprising a tubular body having a peripheral wall including a thick-walled portion and a thin-walled portion, and a through hole penetrating from an outside to an inside of the peripheral wall;
- and a pipe part attached to the through hole, the fabrication method comprising:
- a material removing step of removing material by machining a part of a plate member to obtain an intermediate product including a thin-walled portion where the material is removed and a thick-walled portion with no material removed, the thick-walled portion being thicker than the thin-walled portion;
- an edge joining step of bending the intermediate product and joining both edges thereof to obtain a cylindrical body;
- a first heat treatment step of performing a first heat treatment on the cylindrical body;
- a through hole forming step of forming a through hole from the outside to the inside of the peripheral wall of the cylindrical body;
- a pipe part joining step of joining the pipe part to a portion where the through hole is formed, to obtain a tubular member;
- a second heat treatment step of performing a second heat treatment on the tubular member;
- and
- between the first heat treatment step and the second heat treatment step,
- a flange welding step of welding a flange part to an opening of the cylindrical body, and
- an intermediate heat treatment step of performing a heat treatment on the cylindrical body with the flange part welded thereto.
Dependencies are inferred from the claim text.