<正>The milling-head machine tool is a sophisticated and high-quality machine tool of which the spindle system is made up of special multi-element structure.Two special mechanical configurations make the cutting performance of the machine tool decline.One is the milling head spindle supported on two sets of complex bearings.The mechanical dynamic rigidity of milling head structure is researched on designed digital prototype with finite element analysis(FEA) and modal synthesis analysis (MSA) for identifying the weak structures.The other is the ram structure hanging on milling head.The structure is researched to get dynamic performance on cutting at different ram extending positions.The analysis results on spindle and ram are used to improve the mechanical configurations and structure in design.The machine tool is built up with modified structure and gets better dynamic rigidity than it was before.
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机译:上市公司股权结构对市值管理效果的影响—基于因子分析的实证研究 =The Impact of Corporate Governance Structure Upon Listed Company’s Market Value Management Effect: Based on Factor Analysis