| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a common rail capable of quenching a hole intersection portion with excellent productivity without irregular baking, and capable of preventing deterioration of dimension accuracy. <P>SOLUTION: A base of a rail body 20 is manufactured by forging, quenched to have the low hardness so as to enable cutting, and is cut, and the hole intersection portion 27 is rounded. Next, a high frequency generating tool 31 is inserted into a pressure accumulation chamber hole 23, and high hardness quenching is applied to the hole intersection portion 27 by high frequency quenching to which cutting is difficult. Next, surface treatment such as rust proof treatment is applied to the rail body 20, and function parts are assembled to the rail body 20. High frequency quenching is applied to the hole intersection portion 27, and thereby, irregular baking in the hole intersection portion 27 can be prevented. Further, partial quenching is applied to the rail body 20 by high frequency quenching, and dimension accuracy of the rail body 20 is not deteriorated. By using high frequency quenching, the hole intersection portion 27 can be easily quenched compared to laser quenching, and excellent productivity can be achieved. <P>COPYRIGHT: (C)2008,JPO&INPIT |
