TC4钛合金负角度零件超塑成形及性能研究邵宗科1,.docVIP

TC4钛合金负角度零件超塑成形及性能研究 邵宗科11, 黄重国1, 袁清华2, 雷鹍3 1) 北京科技大学机械工程学院，北京 100083 2) 北京科技大学材料科学与工程学院，北京 100083 3) 航天特种材料及工艺技术研究所，北京 100074 摘要在前期材料实验的基础上对TC4钛合金负角度零件超塑成形过程进行仿真，获得压力-时间曲线和壁厚分布，并预测了模具磨损压力-时间曲线作为实际加载曲线进行超塑成形实验，获得负角度零件。结果表明：取件温度为300 ℃；实际零件型腔底端壁厚分布与仿真结果趋势相同，最大误差为4.4%；成形后材料原始材料。 关键词TC4钛合金；负角度零件；超塑成形；壁厚分布；力学性能 Study of Superplastic Forming and Mechanical Properties for TC4 Alloy Negative-Angle Part Shao Zongke1, Zhang Wenming1, Huang Zhongguo2, Yuang Qinghua2, Lei Kun3 （1. School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China；2. School of Material Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China；3. Institute of Aerospace Special Material and Technology, Beijing 100074, China） ABSTRACT: The superplastic forming progress of the TC4 alloy negative-angle part is simulated on the basis of previous material experiment. The P-t curve and thickness distribution were acquired, and the wear of the die was predicted according to contact friction force distribution in simulation results. The p-t curve acquired from simulation was revised, and the superplastic forming experiment was done using the revised p-t curve which was acted as an actual load curve. Then, the negative-angle part was obtained. The bottom thickness of the part cavity was compared between actual result and simulation result. Meanwhile, negative-angle wall thickness, microstructure and mechanical properties of the part were studied. The results show that the appearance and surface quality is good while the part was taken out at the temperature of 300 ℃. The trend of thickness distribution of the part cavity is similar between the actual result and the simulation result, and the maximum error is 4.4% of them. The minimum thickness is 0.66 mm which is in the position of negative-angle fillet, and the biggest thinning rate is 67%. The negative-angle’s wall thickness standard deviation is 0.186 mm, indicating that the thick