| 摘要 |
PROBLEM TO BE SOLVED: To provide a friction stir joining method which can reduce costs and which can obtain a product excellent in appearance and large in strength and rigidity. SOLUTION: Friction stir joining is performed to a gasket face 12 of a block body 10 and large diameter parts 36a-36c of cylinder sleeves 30a-30c. After that, a release hole Y1, which is formed when a probe 54 of a tool 50 for the friction stir joining is released, is expanded in diameter and finished. And, it is used as a stud bolt hole 62e. Similarly, the friction stir joining is performed to the large diameter parts 36a, 36b each other and the large diameter parts 36b, 36c each other. After that, release holes Y2, Y3, which are formed when the probe 54 is released, are used as stud bolt holes 62f, 62g respectively. COPYRIGHT: (C)2004,JPO&NCIPI
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