| 摘要 |
PROBLEM TO BE SOLVED: To provide a boring device in which operability of the boring device is increased by shortening work time required for changing punches. SOLUTION: This boring device 100 is provided with a boring die 810 to execute boring work to a sheet type workpiece W. The boring die 810 comprises a plurality of second punches 851, 851, etc. capable of forming a plurality of through holes of the same diameter, and a punching die 820 having a selecting mechanism 854 to select one second punch 851 to be provided for boring action, and a die 830 comprising a plurality of die holes 833B, 833B, etc. disposed corresponding to the second punches 851, 851, etc. in the punching die 820. COPYRIGHT: (C)2006,JPO&NCIPI
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