To prevent a burr from developing in a hole in a workpiece to be bored, which is formed of resin, wood, or metal.
The boring method uses an end mill 2 smaller in diameter than a size-predetermined hole 13, bores a temporary hole 18 smaller in diameter than the size-predetermined hole 13 in the workpiece 4 using a blade 16 provided at the distal end of the end mill 2 while axially moving the end mill 2, then cuts an inner surface 22 of the temporary hole 18 with a blade 21 provided on a side surface of the end mill 2 to scrape off the burr 20 developed when the temporary hole 18 is bored in the workpiece 4, thereby the temporary hole 18 is worked into the size-predetermined hole 13. As this method bores the temporary hole 18 in the workpiece 4 while axially moving the end mill 2, although the burr 20 develops in the workpiece 4 when the temporary hole 18 is bored in the workpiece 4, the burr 20 is scraped off by cutting the inner surface 22 of the temporary hole 18 with the blade 21 in the side surface of the end mill 2. The hole 13 in the workpiece 4 is thereby free of the burr 20.
YASUMATSU TORU
HIDAKA MASASHI
TANABE LTD
| JPH07276123A | 1995-10-24 | |||
| JPH10128610A | 1998-05-19 |
Takayoshi Tagawa
Higashio Masahiro