钛合金拉杆缩口增厚成形实验研究

Experimental Study on Necking and Thickening Forming of Titanium Alloy Tie Rods

摘要: 拉杆作为飞行器的重要承力连接构件，对零件机械性能有较高要求。针对传统拉杆飞机拉杆制造存在强度低、质量重、使用寿命短等问题问题，采用缩口增厚成形方法对TA18钛合金薄壁管进行工艺探索。通过研究不同温度下钛合金缩口增厚成形工艺，结果分析了600˚C、700˚C和800˚C薄壁拉杆的成形质量、壁厚分布规律，最后对零件传力区和增厚区的金相组织进行观察。结果表明温度为700˚C缩口增厚成形的零件质量最好，壁厚分布符合预期目标，轴向压力使材料组织出现明显的晶粒细化现象。

Abstract: Tie rods, as an important load-bearing connecting component of aircraft, have high requirements on the mechanical properties of parts. Aiming at the traditional tie rod aircraft tie rod manufacturing problems such as low strength, heavy quality and other problems problems, the use of necking thickening molding method of TA18 titanium alloy thin-walled tube to explore the process. Through the study of different temperatures under the titanium alloy necking thickening forming process, the results of the analysis of 600˚C, 700˚C and 800˚C thin-walled tie rod forming quality, wall thickness distribution law, and finally on the parts of the force transfer zone and the thickening area of the metallurgical organization of the observation. The results show that the temperature of 700˚C necking thickening forming parts of the best quality, wall thickness distribution in line with the expected target, axial pressure to make the material organization of the grain refinement phenomenon is obvious.