|発明の名称||STRUCTURE AND METHOD OF ARRANGING GUIDE PORTIONS OF TIP TOOL FOR DEEP HOLE BORING|
PROBLEM TO BE SOLVED: To provide structure and method of arranging guide portions of a tip tool for BTA (boring trepanning association) boring in which a third guide portion is arranged at an appropriate position in the tip tool to cancel the unstable state of the tool behaviors and eliminate deformation and dislocation appeared periodically, thereby achieving suitable surface condition of the inner periphery of a bore after boring and enhancing boring accuracy.
SOLUTION: In addition to two guide portions 21 and 22 respectively subject to component forces of the force exerted on a blade part 10 of the tip tool 1, the third guide portion 23 suppressing the instability of the tool is arranged at the appropriate position, and the variation of dislocation leading to self-excited vibration of the tool during the boring is restricted by these three guide portions, thereby maintaining the entire tool in a stable operation state. This avoids the unstable state in which the bore cross section is made in a polygonal shape, so that a rifling mark or the like does not appear on the bore internal surface after boring, resulting in the surface condition having no problem. This enhances the boring accuracy and requires neither additional boring nor finishing operation, thus being advantageous in view of time and cost.
- 国立大学法人九州大学 学術研究・産学官連携本部
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