Studies of Dynamic Responses of Boring Bar in Machining

• Main Authors: Guna-Ying Li, 李官穎
• Other Authors: 張銘永
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/21407699940273577773

碩士 === 國立中興大學 === 機械工程學系所 === 97 === The main goal of the thesis is to develop a finite element model of the spinning shafts for studying the vibration of the boring bar during machining process. The shaft systems being investigated include the isotropic solid shaft, the isotropic hollow shaft and the isotropic hollow shaft with a beam absober, as well as the composite shaft. To derive the equation of motion, the rotating reference frames fixed in the shaft are chosen to describe then elastic displacement fields. The kinetic and strain energies of the system are then derived. With these energy experessions and also considering the work done by the viscous damping forces existing between the shaft and the beam, and the cutting force, the Hamilton’s principle is then apply together with the finite element method to derive the equation of motions of the system. The closed-loop transfer function of the shaft system during the boring process are used to determine the stability lobes. To verify the stability lobes, being found using one degree-of-freedom system the Newmark-