| 摘要 |
<p>PROBLEM TO BE SOLVED: To stably maintain an attitude and the straight advance movement action of the tip in cutting of a tip tool, by arranging a third guide part.SOLUTION: In an arrangement structure of a guide part for receiving cutting force of a blade part 10 while generating a clearance for passing cutting oil by contacting with a hole inner surface of a machinable material by the tool outer periphery, in a tip tool 1 for executing cutting work while supplying the cutting oil, the guide part is provided with three guide parts arranged on the tip tool outer periphery, that is, a first guide part 21 in which the most separated part position in the tool diameter direction from the tool rotational center of the guide part, respectively becomes a position within an angle range of 80°-100° on the delay side in the rotational direction of a blade part with a cutting edge position of the blade part as 0°, a second guide part 22 of becoming a position within the angle range of 170°-190° and a third guide part 23 of becoming a position within at least one angle range of the respective angle ranges of 1°-34°, 146°-179° and 326°-359°.</p> |
