Application of Composite Material in Digital Machining Center Construction

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Chih-Rong Chen et al.


The conventional five-axis CNC machine tool bed is fabricated using gray cast iron. However, it lacks overall rigidity and no longer satisfies processing demands. To improve the overall rigidity of the machine tool and address accuracy errors caused by dynamic and static factors, a new mineral composite bed material is proposed in this study.Gravels of Jinan green granite were used as aggregates with high-strength epoxy resin as the adhesive. Carbon fibers were the filler to reinforce the overall material strength. After casting, the test piece would be tested. The results showed that the maximum compressive stress of the test piece could reach 125.8Mpa, and the density was only 1/3 of that of cast iron. Lastly, the composite material was applied to the numerical control machine tool, which would be tested by modal analysis and instruments using Ansys software. The results showed that the maximum stress was reduced by 68.93% and the maximum strain was reduced by 72.6%, compared with gray cast iron. The first 6-order natural frequencies were significantly increased by 20% to 30%, providing it with better resistance to vibration than that of gray cast iron. The material has improved the stability and machining accuracy of the machine tool.

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