| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a boring tool capable of improving working accuracy, and suppressing degradation of the working accuracy due to an external factor. <P>SOLUTION: This boring tool includes three chips 20, 30, 40 formed with roughing blades 22, 32, 42 and finishing blades 23, 33, 43 separated from the roughing blades 22, 32, 42 by predetermined distances in the rear direction, projecting to radial outer sides, and having projecting amounts determined based on maximum values of cutting resistance F23, F33, F43, respectively, wherein the roughing blades 22, 32, 42 are arranged at equal distances from one another in the circumferential direction in attitudes identical to one another with respect to a prepared hole W1, and arranged without shifting from one another in the front-back direction, in which lengths from the working center C to ends on the radial outer sides are set identical to one another; and the finishing blades 23, 33, 43 are arranged at equal distances from one another in the circumferential direction at attitudes identical to one another with respect to the prepared hole W1, and arranged without shifting from one another in the advance direction of a tool body 11, in which lengths from the working center C to ends on the radial outer sides are set identical to one another. <P>COPYRIGHT: (C)2012,JPO&INPIT |
