Design and Development of Stewart-Platform CNC Machine

• Main Authors: Chih Bin Chiang, 姜智彬
• Other Authors: Yuan Kang
• Format: Others
• Language: zh-TW
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/19420354257793314786

碩士 === 中原大學 === 機械工程學系 === 88 === This project is to establish the techniques for development of a 6-6 parallel-platform type CNC machine system. The techniques include structure design and mechanism design for platform, system calibration, 6-cylinder platform control, platform fabrication, 5-axis machining programming. Machine tool chatter is a self-exited vibration between the working material and cutting tool which develops under certain machining condition. High speed machining is usually accompanied with the increased tendency toward chatter vibrations, which affects machining accuracy, surface roughness, tool wear, and tool life, because there is an inherent lack of stiffness in the machine/tool/workspace system and a loss of damping. To avoid chatter, increasing the resistance of vibration for machines is the fundamental solution which can suppress the vibration between the cutter and workspace within an acceptable range. Thus, the design for a high static/dynamic stiffness to enhance the capability of resisting vibration for the 6-DOF Stewart based machine is a major concern. The major task is employing both of the theoretical modal analysis method and experimental modal analysis method to per-form the analysis of static/dynamic stiffness of the machine structure. The analysis results will then be used as the reference to improve the structure of the stewart platform.