US 12,115,593 B2
Method for manufacturing shaft
Hiroyuki Kariya, Sanjo (JP); Takahiro Sekine, Sanjo (JP); Fumihiko Hattori, Sanjo (JP); Kazushi Goi, Sanjo (JP); and Ryo Kurosawa, Sanjo (JP)
Assigned to SANJO MACHINE WORKS, LTD., Sanjo (JP)
Appl. No. 18/008,491
Filed by SANJO MACHINE WORKS, LTD., Sanjo (JP)
PCT Filed Apr. 30, 2021, PCT No. PCT/JP2021/017208
§ 371(c)(1), (2) Date Dec. 6, 2022,
PCT Pub. No. WO2022/085226, PCT Pub. Date Apr. 28, 2022.
Claims priority of application No. 2020-175133 (JP), filed on Oct. 19, 2020; and application No. 2020-196259 (JP), filed on Nov. 26, 2020.
Prior Publication US 2023/0211433 A1, Jul. 6, 2023
Int. Cl. B23K 20/02 (2006.01); B21D 11/20 (2006.01); B23K 37/00 (2006.01)
CPC B23K 20/028 (2013.01) [B21D 11/203 (2013.01); B23K 37/003 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method for manufacturing a shaft, comprising: comprising
polishing end surfaces of a pair of metal sheets to a surface roughness Ra of 2 μm or less;
bending each metal sheet of the pair of metal sheets into a semicylindrical shape;
disposing the pair of the metal sheets that are bent into a semicylindrical shape together so as to form a cylindrical shape by butting together the polished end surfaces of the metal sheets, and then heating the butted portions so that the butted portions are diffusion-joined, thereby forming the cylindrical member;
cooling the cylindrical member;
joining linking members to ends of the cylindrical member to form the shaft; and
cutting or polishing the inner surfaces of the butted portions of the cylindrical member,
wherein in the forming of the cylindrical member, parallel and horizontally disposed end surfaces of the pair of semicylindrical metal sheets are directly butted together, and entireties of the end surfaces are diffusion-joined while pressurized so as to be pressed together in a direction orthogonal to the end surfaces.