Invention Grant
- Patent Title: Method of producing common rail and locally reinforced common rail
- Patent Title (中): 生产共轨和局部加强共轨的方法
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Application No.: US12448581Application Date: 2008-11-12
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Publication No.: US08354613B2Publication Date: 2013-01-15
- Inventor: Atsushi Sugihashi , Koji Hirano , Yasushi Hasegawa
- Applicant: Atsushi Sugihashi , Koji Hirano , Yasushi Hasegawa
- Applicant Address: JP Tokyo
- Assignee: Nippon Steel Corporation
- Current Assignee: Nippon Steel Corporation
- Current Assignee Address: JP Tokyo
- Agency: Kenyon & Kenyon LLP
- Priority: JP2007-293334 20071112
- International Application: PCT/JP2008/070971 WO 20081112
- International Announcement: WO2009/064013 WO 20090522
- Main IPC: B23K26/00
- IPC: B23K26/00

Abstract:
This invention relates to a method producing a common rail excellent in fatigue strength from an inexpensive steel which uses as the material of the common rail a steel for high-strength liquid phase diffusion bonding having good toughness and fatigue strength, which steel contains, in mass %, C: 0.01 to 0.3%, Si: 0.01 to 0.5%, Mn: 0.01 to 3.0%, Cr: 1.0 to 12.0% and Mo: 0.1 to 2.0%, further contains, in mass %, V: 0.01 to 1.0%, B: 0.0003 to 0.01%, Ti: 0.01 to 0.05% and N: 0.001 to 0.01%, has P content limited to 0.03% or less, S content to 0.01% or less and O content to 0.01% or less, further has total content of grain boundary segregated embrittling elements As, Sn, Sb, Pb and Zn limited to 0.015% or less, and a balance of unavoidable impurities and Fe. The steel is used for liquid phase diffusion bonding. The production method uses a pulsed laser beam to perform laser-peening in the presence of a transparent liquid with respect to the vicinity of the boundary between the inner surface 21 of each branch hole 6 and the inner surface 22 of the rail hole 5, located at an opening peripheral zone of the branch hole 6. The surface layer of steel of the opening peripheral zone is thereafter removed.
Public/Granted literature
- US20100055490A1 METHOD PRODUCING COMMON RAIL LOCALLY REINFORCED COMMON RAIL Public/Granted day:2010-03-04
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