基于能量法的管件自由弯曲失稳起皱预测和变形规律研究  

Prediction of Buckling and Deformation Law of Pipe Fittings under Free Bending Based on Energy Method

作　　者：高昇 吴建军[1] 闫晶 张荣霞 喻忠平 刘龙 GAO Sheng;WU Jianjun;YAN Jing;ZHANG Rongxia;YU Zhongping;LIU Long(School of Mechanical and Electrical Engineering,Northwestern Polytechnical University,Xi'an 710072;AVIC Manufacturing Technology Institute,Beijing 100024)

机构地区：[1]西北工业大学机电学院,西安710072 [2]中国航空制造技术研究院,北京100024

出　　处：《机械工程学报》2024年第20期162-172,共11页Journal of Mechanical Engineering

基　　金：重点基础研究(2020-JCJQ-ZD-188-01);陕西省重点研发计划(S2020-YF-ZDCXL-ZDLGY-0029);国家自然科学基金(52475403)资助项目。

摘　　要：以自由弯曲成形管件为研究对象,对管件制造过程中的失稳起皱现象进行预测和规律研究。首先通过对纯弯曲成形管件起皱预测的研究建立自由弯曲管件分析模型,并且推导自由弯曲管件成形的波纹函数。其次,结合管件弯曲变形能计算公式和纯弯曲管件能量预测公式,得到临界能量计算公式。然后,运用ABAQUS有限元仿真软件进行仿真计算,利用自由弯曲临界能量计算公式对管件的失稳起皱现象进行预测,并且进行验证。最后,运用自由弯曲失稳起皱预测方法对影响管件自由弯曲失稳起皱的几个因素进行探索。结果表明,弯曲半径、相对管径和单位长度扭转角是影响薄壁管数控弯曲精确成形过程失稳起皱发生的因素。研究结果为自由弯曲成形过程参数的确定和优化创造了条件。The buckling and wrinkling phenomena in the process of tube manufacturing are predicted and studied by taking the tube formed by free bending as the research object.Firstly,the analysis model of free bending tube is established through the research of wrinkle prediction of pure bending tube forming,and the ripple function of free bending tube forming is deduced.Secondly,combined with the calculation formula of bending deformation energy of tube and the prediction formula of pure bending tube,the calculation formula of critical energy is obtained.Then,ABAQUS finite element simulation software is used for simulation calculation,and free bending critical energy calculation formula is used to predict the buckling and wrinkling phenomenon of tube and verify it.Finally,the prediction method of free bending buckling wrinkling is used to explore several factors affecting the free bending buckling wrinkling of pipe fittings.The results show that the bending radius,relative pipe diameter and unit length twist angle are the factors that affect the occurrence of buckling and wrinkling in the precision forming process of thin-walled tube NC bending.The research results have created conditions for the determination and optimization of parameters in the free bending forming process.

关 键 词：自由弯曲 失稳起皱 能量法 影响因素 

分 类 号：V264[航空宇航科学与技术—航空宇航制造工程]