预应力机架螺纹连接弹塑性有限元分析及优化设计  

Elastic-plastic FEA of the thread connection used in pre-tightened press frame and it's optimized design

作　　者：林谢昭[1,2] 林秋伟[1] 

机构地区：[1]福州大学机械工程及自动化学院,福州350108 [2]福建海源自动化机械股份有限公司,福州350101

出　　处：《现代制造工程》2015年第4期53-56,共4页Modern Manufacturing Engineering

基　　金：福建省自然科学基金资助项目(2013J01182)

摘　　要：针对液压机预应力机架拉杆螺纹第一承载牙根部出现了早期裂纹并发生断裂的问题,运用弹塑性接触有限元方法和Python语言,对拉杆连接螺纹进行参数化建模和分析,研究标准锯齿形螺纹的螺距和旋合圈数对牙根部最大等效应力以及牙间载荷分布的影响,并进行优化设计,得到不同螺距下的最优旋合圈数。结果表明,合理的螺距和旋合圈数能够有效地改善螺纹连接应力及载荷分布,进而提高螺纹的疲劳寿命,为大型压机螺纹连接结构设计提供理论参考。The first tooth-root portion of the rod thread in a hydraulic press pre-stressed frame appeared early crack and tended to fatigue fracture.To solve this problem,a parameterized model of the thread connection was setup with Python and solved by the e -lastic-plastic contact finite element method .The effects of the different pitches and the number of turns for the standard buttress thread form on the peak of equivalent stress and axial load distribution was simulated and studied also .After that,the optimal turning-numbers for different screw pitches was obtained .The results indicate that a reasonable pitch and turning-numbers can ef-fectively reduce the maximum stress and homogenize the load distribution between the teeth .Therefore the fatigue life of the thread connection can be improved .The research findings can provide a useful theoretical guidance for the design of the thread connection of a large-scale hydraulic press frame .

关 键 词：螺纹连接 弹塑性接触 液压机机架 优化设计 有限元分析 

分 类 号：TH131.3[机械工程—机械制造及自动化] O342[理学—固体力学]