| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To improve dischargeability of swarf while improving resistance to defect of an end cutting edge, improve durability of a tool and also stability in machining, and improve machining accuracy on an end surface in end mill machining. <P>SOLUTION: In a spiral radius end mill, the end cutting edge 3 comprises at least two blades, a first end cutting edge 3a connecting to a corner cutting edge 4 is approximately at the right angle to a tool shaft C and has a shorter cutting edge length than a total length of the end cutting edge except the first end cutting edge. A rake face 9 of the end cutting edge comprises at least two surfaces, wherein a first end cutting edge rake surface 9a in contact with the end cutting edge has a rake angle specified to be a negative angle and second and following end cutting edge rake surfaces disposed on a side of a shank 8 have a rake angle of 0°or a positive angle. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
