| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a cylindrical rotating tool having coolant injected from an outlet in an internal fluid passage, flowing on an outer circumferential surface of the rotating tool, while spreading in a curved fan shape without diffusing outward in a radial direction, and being supplied to a tip, to cool the tool outer circumferential surface and the tip. <P>SOLUTION: This cylindrical rotating tool 3 includes a major diameter portion 20 formed with the internal fluid passage 4, a minor diameter portion 21 arranged in front of the major diameter portion 20 and the tip 22 mounted in the front part of the minor diameter portion 21. When seen from behind a central axis line CL, an inner circumference of the outlet 23 of the internal fluid passage intersects with an outer circumference of the minor diameter portion 21. At the site of the outlet 23, a notch 25 is formed on an outer circumferential surface 26 of the minor diameter portion 21. An inclined portion 30 of the notch 25 is formed obliquely so that the distance from the central axis line CL to the inclined portion on further forward of the minor diameter portion 21 becomes larger than the distance from the central axis line CL to the inclined portion on a closest portion P1 on the entire circumference of the outlet 23 to the central axis line CL. The inclined portion 30 guides a partial flow L1 of the coolant L, gushing forward from the outlet 23, outward in a radial direction of the minor diameter portion 21. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
