| 摘要 |
<P>PROBLEM TO BE SOLVED: To manufacture a common rail having excellent fatigue strength by using low-cost steel material. <P>SOLUTION: Liquid phase diffusion bonding steel having toughness and fatigue strength, and containing C of 0.01-0.3%, Si of 0.01-0.5%, Mn of 0.01-3.0%, B of 0.001-0.01%, N of 0.001-0.01%, Al of 0.01-0.5%, and Ti of 0.01-0.10%, having contents of P, S, and O limited not greater than 0.03%, 0.01% and 0.01% respectively, in mass percentage, and having rest of the material comprised of unavoidable impurities and Fe, is used as material for the common rail 1, and liquid phase diffusion bonding is performed. Laser peening irradiating pulse laser beam with making clear liquid exist is applied on an inner surface 22 of a rail hole 5 and an inner surface 21 of a branch hole 6 positioned at an opening circumference part 23 of the branch hole 6. Then, a surface layer of material of the opening circumference part 23 is removed. <P>COPYRIGHT: (C)2010,JPO&INPIT |
