1. HC CHUANG - Graduate Institute of Manufacturing Technology, National Taipei University of Technology, Taipei
2. CR CHEN - Graduate Institute of Manufacturing Technology, National Taipei University of Technology, Taipei Taiwan.
Five-axis CNC-VMC machines usually have a high-speed spindle, at a maximum speed of50,000 rpm, processing under such a high-speed cause vibration in the tool bed easily and affect the machining accuracy and surface quality of the product. Since the machine tool is made of cast iron; its dynamic properties is poor for suppression of vibration which cannot meet the processing needs of the current market. Therefore, a granite composite material (GCM)for the structure of machine tool bed was proposal in this study .Granite fragments, high-strength epoxy resion, and semented carbon fiber were used as the main ingredients, and maximized the filler by using the production process technology. After that GCM specimen was casted, and the specimen was examined for its mechanical properties. The results showed the GCM specimen has only 1/3 density of cast iron with maximum compressive stress of 125.8MPa.Finally, this GCM was applied to the digital controlled machine tool bed, and the result revealed that the maximum stress was reduced by 68.93% and the maximum strain was reduced by 72.6%,when compared with the graycast iron. Moreover, the inherent frequency of the first to 6th orders was significantly increased by 20-30%,which indicated GCM has a better anti-vibration effect than the gray cast iron and can improve the stability and accuracy of the machine tool.
STUDY ON THE APPLICATION OF A GRANITE COMPOSITE MATERIAL IN FIVE-AXIS CNC-VMC MACHINE TOOL