| 摘要 |
PROBLEM TO BE SOLVED: To provide a processing method for a work-piece capable of forming an outside air introduction hole at any position in an outer shell of a container.SOLUTION: A processing method for a work-piece comprises a process to form a circular hole in a work-piece by pressing a rotating boring drill, which has a cylindrical tip provided with a flat surface and a notch part at the tip and a cutting part on a side face of the notch part, the work-piece with the flat surface to contact the cutting part with the work-piece.SELECTED DRAWING: Figure 11 |
