摘要
钛合金型材弯曲构件由于性能优异而逐渐成为先进民用复合材料机身的主要承力构件,其成形质量直接关系到飞机的装配精度。本文针对OT4M钛合金L型材的拉弯成形工艺进行了研究,建立了拉弯过程的解析模型,并在不同的试验条件下进行了多组热单轴拉伸试验来探究型材的热变形行为,利用绝缘模具开展了钛合金型材的电热拉弯成形试验,结果表明,材料的塑性变形能力受变形温度和速度影响显著,拉弯成形时绝缘模具的应用可使钛合金型材保持在相对较高的温度490℃下成形,进而降低了回弹。
The profile bending parts of Titanium alloy gradually become the main load-bearing components of advanced civil composite material fuselage due to their excellent properties. The forming quality is directly related to the assembly accuracy of aircraft. Here, a study on the stretch bending process of L-section profile of OT4M titanium alloy was conducted. Firstly, a model for stretch bending process was developed. Then, multiple groups of thermal uniaxial tension under different conditions were performed to determine the deformation behavior of profiles. Lastly, the electrically assisted stretch bending were carried out with insulation mold. The results indicate that the plastic deformation capacity of material is significant affected by the temperature and velocity, the application of insulation mold in the stretch bending process can reduce springback by keeping profiles forming at a temperature of 490 ℃.
作者
曹凤超
曾元松
刘宝胜
王永军
Cao Fengchao;Zeng Yuansong;Liu Baosheng;Wang Yongjun(Metal Forming Department, AVIC Manufacturing Technology Institute, Beijing 100024, China;Aeronautical Key Laboratory for Plastic Forming Technologies, Beijing 100024, China;Beijing Key Laboratory of Digital Plastic Forming Technology and Equipment, Beijing 100024, China;School of Mechanical Engineering, Northwestern Polytechnical University, Xi′an 710072, China)
出处
《机械科学与技术》
CSCD
北大核心
2019年第9期1437-1442,共6页
Mechanical Science and Technology for Aerospace Engineering
关键词
钛合金型材
拉弯
解析模型
单轴拉伸
回弹
titanium alloy profile
stretch bending
analytical model
uniaxial tension
springback
