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首页> 外文期刊>American journal of applied sciences >Static and Dynamic Performance Improvement of Conventional Computer Numerical Control (CNC) Machine Tool Bed with Hybrid Welded Steel
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Static and Dynamic Performance Improvement of Conventional Computer Numerical Control (CNC) Machine Tool Bed with Hybrid Welded Steel

机译：常规混合焊接钢数控机床床身静态和动态性能的改善。

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Problem statement: The advancements in machine tools to maximize the production by increasing spindle speeds have caused vibration in machine tools. The two functional requirements of machine tool bed for machine tools are high structural stiffness and high damping, which cannot be satisfied simultaneously if conventional metallic materials such as cast iron are employed. Hence there is a need to replace cast iron with alternate materials. Approach: The objective of this study is to improve the stiffness, natural frequency and damping capability of machine tool bed using a composite material containing welded steel and polymer concrete. Welded steel material has high stiffness but low damping and polymer concrete has high damping but low stiffness. So in this study, a machine tool bed made of sandwich structures of welded steel and polymer concrete is designed and manufactured. Modal and static analyses were conducted numerically and experimentally to determine the modal frequencies, damping ratio, deformation and strain. Results: The results at first mode showed that the natural frequency improved by 24.7% and damping ratio was 2.7 times higher than cast iron. The comparison of strain and deformation also showed significant improvement. Conclusion: This study proposed a hybrid welded steel bed as a replacement for cast iron as a machine tool bed material and the results showed that the static and dynamic characteristics were superior to cast iron.
机译：问题陈述：机床技术的进步通过提高主轴转速来最大化产量，已引起机床振动。机床的机床床的两个功能要求是高结构刚度和高阻尼，如果采用传统的金属材料（例如铸铁），则无法同时满足这些要求。因此，需要用替代材料代替铸铁。方法：本研究的目的是使用包含焊接钢和聚合物混凝土的复合材料来提高机床床身的刚度，固有频率和阻尼能力。焊接钢材料具有较高的刚度，但阻尼较低，而聚合物混凝土具有较高的阻尼，但刚度较低。因此，在本研究中，设计并制造了由焊接钢和聚合物混凝土的夹层结构制成的机床床。数值和实验进行模态和静态分析，以确定模态频率，阻尼比，变形和应变。结果：第一种模式的结果表明，固有频率提高了24.7％，阻尼比是铸铁的2.7倍。应变和变形的比较也显示出明显的改善。结论：本研究提出了一种混合焊接钢床，以替代铸铁作为机床床身材料，结果表明，其静态和动态特性优于铸铁。

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