To surely improve the fatigue strength of a male screw by providing a surface hardening part that has increased surface hardness and that is applied with a compressive residual stress, on the surface of the male screw.
In a bolt having a male screw comprised of a nickel-based super alloy, a surface hardening part that has increased surface hardness and that is applied with a compressive residual stress is provided at least on a surface of the male screw, and the surface hardening part is provided by processing for abutting alumina particles having such a particle size as to pass through a mesh of mesh size #150, to at least the surface of the male screw. Furthermore, a method for manufacturing the bolt having the male screw comprised of the nickel-based super alloy includes the steps of cutting for forming the male screw, and of processing for providing the surface hardening part by abutting alumina particles having such a particle size as to pass through the mesh of mesh size #150 at least on the surface of the male screw in such a manner that surface hardness is increased and the compressive residual stress is applied.
HIROKAWA KAZUHARU
IHARA KEISUKE
OSAWA KEI
ISHIKAWA HIROSHI
TORIGOE TAIJI
YAMAMOTO RYUICHI
HASHIMOTO YUKIHIRO
IZUTSU NOBUYUKI
TAKAHASHI KOJI
| JPH04256577A | 1992-09-11 | |||
| JP2007512488A | 2007-05-17 | |||
| JPH06229409A | 1994-08-16 | |||
| JPH02218520A | 1990-08-31 | |||
| JPS616209A | 1986-01-11 | |||
| JP2005199329A | 2005-07-28 |
Jun Takamura