オートコリメーション方式深穴形状精度測定システムの開発（第3報）: 真円度，円筒度および真直度の測定

摘要

The measuring system for evaluating the accuracy of a deep hole is developed by using the autocollimation principle. The system consists of a measuring unit and an optical system for light reception. The measuring unit detects the displacement of a feeler on the basis of the autocollimation principle. The optical system for light reception receives the laser beam irradiated from the measuring unit. In this research, the measuring accuracy and repeatability error of the system are evaluated by measuring the roundness, cylindricity and straightness of 110-mm-diameter holes of a ring gage and machined hole. As a result, it is clarified that the accuracies of the roundness, straightness and cylindricity measured by the measuring system correspond well to those by the tester in terms of both shape and value and that the repeatability error of 10 measuring measurements of roundness of machined hole is ±0.4μm.%船舶エンジンのシリンダーライナーなどの穴深さlと穴径drnとの比（l/d）が特に大きい深穴加工ができる工具として，rnBTA（Boring and Trepanming Association）方式工具およびガンrnドリルがある．これらの工具は自己案内作用があり，真直性にrn優れているが，加工の対象となる穴が深くなると曲がりが生じrn問題となる場合が多い．穴の評価に関しても加工と同様に，評rn価対象となる穴が深くなるほど測定精度は低下する．一般に穴rnの真円度，円筒度，真直度などは真円度測定器や三次元測定器rnで測定される．