| 摘要 |
<p>PURPOSE:To enable a tool to be accurately decided to generate its wear or even break immediately after a start of machining and immediately before its end, by providing a slide bearing part by the fluid pressure and pressure sensors between a guide member of a tool mounting bed and a fixed member in a lathe or the like. CONSTITUTION:A lathe, which feeds a tool mounting bed 3 in a direction Z in the drawing by a ball thread 8 in one end of a guide plate 7 fixed to a turret shaft 2 in a cross slide 6, machines a work W by a tool 4. A cylindrical guide shaft 14 is provided in the other end of the guide plate, supporting moment in a radial direction. And the lathe, which injects pressure oil from a pump 17 to a clearance 16 between the guide shaft 14 and a bearing unit 15 to form a static pressure bearing while provides pressure sensors 21, 22 in upper and bottom pressure oil ports 19a, 19b to be connected with a pressure detector and an NC unit through a semiconductor element, detects the tool, if it is represented by a characteristic curve of time-torque through signals from the sensors 21, 22, to be worn or broken by a pulse-patterned peak. In this way, operation is stopped or an automatic exchange instruction of the tool is generated.</p> |
