文档介绍：硕士学位论文摘要随着精密机床向高速度、高精度、高柔度方向的迅速发展,除了要求机床重量轻、成本低、使用方便和具有良好的工艺性外,还着重要求机床具有愈来愈高的加工性能。机床的加工性能包括其加工质量和切削效率两个重要的方面,通常用被加工零件能达到的最高精度和表面光洁度来评定机床的加工质量,用金属切除率或切削用量的最大极限值来评定机床的切削效率。而机床的加工性能又与其动’态性能紧密相关,事实证明,随着机床加工性能的不断提高,对机床动态性能的要求也愈来愈高。床身是机床的一个重要基础部件,因此床身动态性能直接影响到机床的加工精度。精密机床的床身一般为具有筋板的框形结构,床身内部的筋板的布置以及筋板开孔的尺寸对机床动态性能有巨大的影响。合理地选择筋板的布置形式和筋板孔的尺寸,不但可以提高床身的动态性能,而且可以节约材料和降低生产成本。本文以VMC750立式加工中心床身为例,对影响精密机床床身动态性能的因素进行了探究。首先建立床身的有限元模型,并对其进行动态分析,找出床身的薄弱环节。再以改变床身的内部结构为出发点,提高床身的抗振性能。即先提出床身的几种典型筋板布局方案并对其进行分析,以床身结构固有频率为优化目标, 从中选取合理的筋板布局型式;然后提取床身的典型元结构并进行结构优化设计, 找出合理的结构优化参数;最后以元结构优化结果为依据,提出该床身结构的优化方案,并对方案进行分析。分析结果表明,该方案床身的动态性能有了明显的提高。关键词:床身,动态特性,动态分析,结构优化,有限元,ANSYS 要耋墨互鏖窒墼垫查兰竺坌丝皇堡些 A BS TRAC T With therapidly development ofPrecision machine tools inhigher speed,higher precision and higher flexibility,besides therequirement ofmachine。s weight being light,lower cost,convenient application and good technical capability,higher and higher machining capability capability includes machining quality and cutting ’S machining capability isusually assessed by the tiptop precision and superficial roughness thatCan be reached of the being processed curing efficiency isusually assessed by the most limit value of removal rate or cutting machining capability isclosely correlation with machine’S dynamic capability,It isproved that thedemand ofmachine’S dynamic capability ishigher and higher withtheimprovement ofmachining capability. The machine tool bed ponent formachine tool,thus its dynamic capability willdirectly influence uracy structure oftheprecision machine toolbed ismade up ofbasic distribution of the rib wall and the hole size on the ribwall pose themachine tool bed will influence thedynamic capability aresult,how toput out the ribwalland choose the hole size on the ribwall is akey point toimprove itsdynamic capability and economy thematerials used and cutthe cost. This thesisanalizes thefactorswhi