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摘 要
隨著計算機的普及和計算速度的提高，有限元分析已越來越廣泛地應用到工程分析計算問題，其分析手段已成為現(xiàn)代機械設備CAE分析的主流方法，也是解決我國機械產品設計分析水平落后的關鍵手段之一。主軸滑枕是機床中一種必不可少的通用零部件，亦是影響機床工作性能的薄弱環(huán)節(jié)。
本論文的主要目的就是針對機床主軸關鍵部件——滑枕進行相關分析。采用Ansys命令流方式建立高速數(shù)控機床主軸滑枕實體分析模型（其中加強筋厚度給出了三種，分別為15mm，20mm，25mm），并對他們在滑動軸承支撐、高速旋轉條件下動力學行為進行有限元分析，求解出系統(tǒng)模態(tài)頻率、模態(tài)振型、瞬態(tài)動力響應和周期激勵下諧響應譜，在分析的基礎上進行比較，確定系統(tǒng)的薄弱環(huán)節(jié)，對大型龍門銑床主軸滑枕的結構變形規(guī)律，給出了定性分析結論，選擇出了三種加強筋厚度中最優(yōu)的一種，同時，在分析的基礎上提出了一些改進措施，為工作中進行機械系統(tǒng)結構CAE分析打下良好的基礎，為滑枕結構優(yōu)化設計提供理論依據和指導。
關鍵詞：CAE；主軸滑枕；有限元分析；變形分析；改進措施
Abstract
With the development of computers and the speed of calculation, finite element analysis has become increasingly widely in the calculation of engineering analysis, of which analysis methods has become the mainstream of CAE analysis methods, and the analytical tools has become one of the key method to solve the problem of the level of product design behind about our country mechanical analysis. Spindle ram is the necessary and general components of machine tools, which is also the weak link with frequent failures.
The main purpose of this paper is to analysis the spindle - ram which is the key components for machine tool. Ansys command is used to create high-speed flow axis CNC machine tool ram model entities, and do the finite element analysis under the conditions of the sliding bearing support and the high-speed rotary dynamic behavior.Their kinetic analysis, a system for solving modal frequencies, modal vibration mode, the transient dynamic response and the cycle of harmonic excitation response spectrum. In based of the analysis to make sure the weak links in the system,and find out the large gantry milling machine spindle ram deformation of the structure for giving the conclusions of the qualitative analysis, which carry out the work of CAE analysis of the structure of mechanical systems and lay a good foundation for the structural optimization ram designed to provide the theoretical basis and guidance.
Keywords: CAE；Spindle ram；Finite element analysis；Deformation analysis；Improvement measures