TC4钛合金薄壁双侧曲面翻边结构热成形工艺  

Hot forming process of flanging structure for TC4 titanium alloy with thin wall and curved surface on both sides

作　　者：王瑶 张涛 孟庆磊 WANG Yao;ZHANG Tao;MENG Qing-lei(AVIC Manufacturing Technology Institute,Beijing 100024,China)

机构地区：[1]中国航空制造技术研究院,北京100024

出　　处：《塑性工程学报》2022年第2期62-68,共7页Journal of Plasticity Engineering

基　　金：航天先进制造技术研究联合基金重点资助项目(U1937203);中央高校基本科研业务费专项资金资助项目(XZY012019003);陕西省自然科学基础研究计划项目(2020JQ-067)。

摘　　要：针对某大尺寸、薄壁、双侧曲面、高翻边、翻边弯曲半径较小的TC4钛合金异形零件的热成形工艺,研究了模具设计以及不同工艺参数组合对成形缺陷产生的影响,并对成形后的试验件进行了微观组织分析、显微硬度和拉伸性能测试。结果表明,采用成形温度730℃、压边力49 kN、成形速率3 mm·min^(-1)的组合工艺参数,可获得无褶皱、叠料、拉裂、厚度严重减薄等缺陷的理想零件。与原材料性能相比,试验件的抗拉强度和屈服强度明显较低,断后伸长率和屈强比较高。针对试验件的各项力学性能,在抗拉强度相差不大的情况下,屈服强度越高,屈强比越高,断后伸长率越低。In allusion to the hot forming of special-shaped TC4 titanium alloy parts with large size, thin wall, curved surface on both sides, high flanging size and small bending radius of flanging, die design and the influence of different process parameter combinations on forming defects were studied. The microstructure of the formed parts was analyzed, and microhardness and tensile properties were tested. The results show that the ideal parts without defects such as folding, stacking, cracking and serious thickness thinning are obtained with the forming temperature of 730 ℃, blank holder force of 49 kN and forming rate of 3 mm·min^(-1). Compared with the properties of raw materials, the tensile strength and yield strength of test parts are obviously lower, while the elongation after fracture and the yield ratio are higher. In allusion to the mechanical properties of test parts, when the tensile strength difference is little, the yield strength and the yield ratio are higher, and the elongation after fracture is lower.

关 键 词：TC4钛合金 薄壁 复杂曲面 热成形 

分 类 号：TG306[金属学及工艺—金属压力加工] TG146.2[一般工业技术—材料科学与工程]