| 摘要 |
PURPOSE:To reduce damping of signal considerably thus to improve the reliability of abnormality detection by arranging an acoustic emission (AE) sensor in the proximity of the tool through a thin flat bearing. CONSTITUTION:AE sensor 6 is secured to an oiless flat bearing 3 sliding through oil film against the outercircumference of a tool holder 11 adjoining to the tool 5 grasping section 13 and supporting the spindle 2 rotatably. Since AE signal is taken out through AE sensor from an oiless flat bearing sliding through oil film against the outercircumference of tool holder adjoining to the tool grasping section, the distance L between the tool 5 and the sensor 6 can be shortened while since the metal joints are reduced, damping of signal can be reduced considerably. |
