大学毕业论文—基于摩擦传动的高分辨率和大冲程的微量进给机械系统外文翻译.doc

外文资料与中文翻译 Micro-feed Mechanism with High-Resolution and Large-StrokeBased on Friction Drive Haitao Liu?, Zesheng Lu School of Mechantronics Engineering, Harbin Institute of TechnologyABSTRACT Based on friction driving principle, design a long stroke length and high resolution walking micro-feeding device driven by piezoelectric ceramic elements and combined with the screw shaft and aerostatic guide way. The design was made to the adjustable preload device by flexible four-bar linkage. The static properties of flexible linkage device are analyzed with FEM. The transmission characteristics of micro-feeding device are exhaustively analyzed. Keywords: Friction drive, Piezoelectric actuator, Flexure hinge,Finite element 1. INTRODUCTION Aspheric optics has been widely used in industries such as aviation, aerospace, national defense and so on. However, the manufacture of large aspheric optics faces many problems such as great difficulty, low efficiency, high cost, increased requirement on process equipment etc [1, 2] . In order to arrive at high precision, the micro displacement resolution of ultra-precision machine must be further advanced, so as to compensating the processing error online. Therefore, the design of micro-feed mechanism has become one of the key technologies [3-7] . PZT is the new micro-feed mechanism developed in recent years. It has the advantages such as small volume, large power, high resolution, and high frequency response and so on and phenomena such as no heating, no backlash and mucosity, so it’s widely used micro controller in micro-feed mechanism. Nowadays, friction gearing mechanism is gradually been acquired and used [8, 9]. 2. STRUCTURE AND OPERATING PRINCIPLE OF MICRO-FEED MECHANISM The micro-feed mechanism is made up of three parts: friction gearing, ball screw and static-pressure air-bearing guide way. Micro-feed mechanism uses the piezoelectricity ceramic friction gearing block, which twist up the sleeve and drive the ball screw, so as t