| 摘要 |
PROBLEM TO BE SOLVED: To provide a deep hole machining drill with an oil hole, performing non-step machining, and solving the problem that when the drill knife edge strength and chip discharge performance are both provided, the number of times of re-polishing the drill cannot be increased so that repeated use is impossible. SOLUTION: In this deep hole drill with a spiral through-hole, the hole working depth is about 15 to 30 times as large as the diameter of the drill. The deep hole drill with a spiral through-hole is characterized in that both the helix angle of a gullet, and the helix angle of the spiral through-hole for supplying a fluid such as cutting oil agent, cutting mist or air are variable. Further, both the helix angle of the gullet of the drill and the helix angle of the spiral through-hole are increased by stages from the knife edge side to the shank part rear end. COPYRIGHT: (C)2006,JPO&NCIPI
|
