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首页> 外文期刊>Proceedings of the institution of mechanical engineers >Static and dynamic behavior of steel-reinforced epoxy granite CNC lathe bed using finite element analysis
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Static and dynamic behavior of steel-reinforced epoxy granite CNC lathe bed using finite element analysis

机译：钢筋混凝土花岗岩花岗岩数控车床床身的静态和动态行为的有限元分析

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摘要

Machine tools are used to manufacture components with desired size, shape, and surface finish. The accuracy of machining is influenced by stiffness, structural damping, and long-term dimensional stability of the machine tool structures. Components machined using such machines exhibit more dimensional variations because of the excessive vibration during machining at higher speeds. Compared to conventional materials like cast iron, stone-based polymer composites such as epoxy granite have been found to provide improved damping characteristics, by seven to ten folds, due to which they are being considered for machine tool structures as alternate materials. The stiffness of structures made of epoxy granite can be enhanced by reinforcing with structural steel. The current work highlights the design and analysis of different steel reinforcements in the lathe bed made of the epoxy granite composite to achieve equivalent stiffness to that of cast iron bed for improved static and dynamic performances of the CNC lathe. A finite element model of the existing the cast iron bed was developed to evaluate the static (torsional rigidity) and dynamic characteristics (natural frequency) and the results were validated using the experimental results. Then finite element models of five different steel reinforcement designs of the epoxy granite bed were developed, and their static and dynamic behaviors were compared with the cast iron bed through numerical simulation using finite element analysis. The proposed design (Design-5) of the epoxy granite bed is found to have an improvement in dynamic characteristics by 4-10% with improved stiffness and offers a mass reduction of 22% compared to the cast iron bed, hence it can be used for the manufacture of the CNC lathe bed and other machine tool structures for enhanced performance.
机译：机床用于制造具有所需尺寸，形状和表面光洁度的部件。加工精度受机床结构的刚度，结构阻尼和长期尺寸稳定性的影响。由于在较高速度下的加工过程中过度振动，因此使用此类机器加工的零件会出现更大的尺寸变化。与常规材料（例如铸铁）相比，已发现石基聚合物复合材料（例如环氧花岗岩）可提供7到10倍的改进阻尼特性，因此，它们被认为是机床结构的替代材料。环氧花岗岩制成的结构的刚度可以通过用结构钢加固来提高。当前的工作着重于设计和分析由环氧花岗岩复合材料制成的车床中不同的钢筋，以达到与铸铁床相同的刚度，从而改善CNC车床的静态和动态性能。建立了现有铸铁床身的有限元模型，以评估其静态（扭转刚度）和动态特性（固有频率），并使用实验结果对结果进行了验证。然后，开发了五种环氧花岗岩床身钢筋设计的有限元模型，并通过有限元数值模拟，将其静态和动态特性与铸铁床身进行了比较。环氧花岗岩床的拟议设计（设计5）发现动态特性提高了4-10％，刚度得到改善，与铸铁床相比，质量降低了22％，因此可以使用用于制造CNC车床和其他机床结构，以提高性能。

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