直线引动器的刚度分析及正确性验证  

Stiffness Analysis of Linear Actuator and Proof of the Correctness

作　　者：卢思学 陈忆[1,2] LU Si-xue;CHEN Yi(National Astronomical Observatories/Nanjing Institute of Astronomical Optics ＆ Technology, Chinese Academy of Sciences, Jiangsu Nanjing 210042, China;Key Laboratory of Astronomical Optics ＆ Technology, Nanjing Institute of Astronomical Optics ＆ Technology, Chinese Academy of Sciences, Jiangsu Nanjing 210042, China;University of Chinese Academy of Sciences, Beijing 100049, China)

机构地区：[1]中国科学院国家天文台南京天文光学技术研究所,江苏南京210042 [2]中国科学院中国科学院天文光学技术重点实验室,江苏南京210042 [3]中国科学院大学,北京100049

出　　处：《机械设计与制造》2018年第A01期127-131,共5页Machinery Design & Manufacture

基　　金：国家自然科学基金项目-天文光谱仪缝前系统结构研究(11573048)

摘　　要：直线引动器是一种较为特殊的导轨,被广泛应用于精密仪器的制造领域,是实现导向、精确定位必不可少的元件,对其进行静力学建模与刚度分析,可以为仪器设备的稳定性分析提供理论依据。以THK公司开发的KR26直线引动器为例,研究直线引动器的静力学建模方法及其刚度。首先从Hertz接触理论出发,通过研究单个滚珠与轨道接触的受力情况得到其类刚度系数的表达式及数值。之后建立解析模型,对直线引动器的整体刚度进行研究,分为无预压与有预压两种情况进行讨论,得到其整体刚度的表达式及刚度曲线。最后,基于Ansys Workbench进行有限元建模仿真,从有限元的角度对理论分析的正确性进行分析验证。Linear actuator is a kind of guide rail different from other rails as an important component widely used in the production of precise instrument. It is an essential element to implement the function of guidance and accurate locating. It can provide theoretical foundations to insure the devices working stably by establishing and analyzing the static model. This investigation takes KR26 made by THK corporation and based on Hertz contact theory for example, firstly, the contact stiffness is solved by studying the contact between a single ball and groove. Then the total stiffness is studied by modeling a analytical model , which would be discussed in two different conditions which differs in considering preload or not. The expression of total stiffness and the force-deformation curve would be solved, and the comparison with the test from THK corporation would be showed. Finally , the finite element model would be established and prove the correctness of theoretical analysis.

关 键 词：直线引动器 HERTZ接触理论 接触刚度 有限元法 

分 类 号：TH16[机械工程—机械制造及自动化] TH124