| 摘要 |
PURPOSE: An end mill with a double cutting edge is provided to maintain cutting force, cutting heat, and flank sharpened level in balance. CONSTITUTION: An end mill with a double cutting edge comprises a main blade(30) extended to the radial direction. The center of a main blade flank is formed with a groove(38). The groove is formed alongside a dent(34) which is extended for forming the main blade. The flank is separated into a front flank and a rear flank by the groove. By putting an edge on the rear flank, one cutting edge(32-2) is formed besides the other cutting edge(32-1). [Reference numerals] (AA) Radial direction;
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