| 摘要 |
PROBLEM TO BE SOLVED: To provide a through-hole manufacturing method of a cylinder body wall surface for easily and surely performing work for boring a through-hole without leaving a processing burr on a wall surface of a cylinder member, without depending on a skilled person. SOLUTION: This through-hole manufacturing method of the cylinder body wall surface without generating the processing burr on the inner wall surface side of the through-holes 2a and 2b bored by penetrating a tool 11 through a wall surface of a cylinder body 2, comprises a boring process of boring one or a plurality of pairs of through-holes 2a and 2b on the cylinder body wall surface by penetrating the tool 11 from the outside of the cylinder body 2 so as to be orthogonal or substantially orthogonal to the axis 5 of the cylinder body 2, and a welding process of blocking up the through-hole 2a by welding by being bored by penetrating the tool 11 through the inner wall surface side from the outer wall surface side of the cylinder body 2 by using a welding tool 12 of a raw material superior in heat conductivity to the cylinder body 2. The through-hole 2b bored by penetrating the tool 11 through the outer wall surface side from the inner wall surface side of the cylinder body 2, is left as a nozzle hole 3. COPYRIGHT: (C)2009,JPO&INPIT
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