Effect of Guideway System on the Dynamic Characteristics of the Feeding Stage of a Machine Tool

• Main Authors: Gen-Nan Kuo, 郭根男
• Other Authors: Jui-Pin Hung
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/44019659960031542157

碩士 === 國立勤益科技大學 === 機械工程系 === 101 === Usually, for a machine tooling system, the linear positioning stage or feeding table was assembled by the combination of different linear components such as linear guides or sliding guides and ball screw with various specifications. This will further bring the feeding system different dynamic characteristic and hence affect its positioning precision. This study was aimed to investigate the dynamic characteristics of a multi-axis feeding stage of a milling machine. In order to clarify the influence of the guide system on the structure performance, we have proposed finite element approach to modeling the X-Y working tables with sliding and rolling guide, respectively. In the finite element models, the different feeding mechanisms with sliding or rolling guides were also modeled through the use of surface contact elements with the introduction of the adequate contact stiffness. With these models, the effect of preloaded amount of the guideway system on the dynamic characteristics of the working table was evaluated. The results show that the machine models with sliding and rolling guides show similar vibration behavior. But the sliding guides give more constraints to the motion of working table, showing higher vibration frequency and dynamic stiffness when compared to the machine model with rolling guides, especially in Z-axis dynamic characteristics. This obviously indicates that the guide system significantly influences the resonant frequency and the response amplitudes of a feeding stage.