Optimization of Titanium Alloy Injection Molding Process Parameters
GUO Shi-bo1, QU Xuan-hui1, DUAN Bo-hua2, HE Xin-bo1, QIN Ming-li1
1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China; 2. The Institution of PowderMetallurgy, Central South University, Changsha, 410083, China
Abstract：Effects of process parameters such as injection pressure, injection speed, injection temperature, die temperature and their interaction, on the density and strength of the as-molded specimens were systematically studied by using orthogonal arrays design and statistical analysis method. The notability of process parameters was estimated and process parameters were optimized. Results indicated that injection pressure, injection temperature and their interaction had remarkable effect on strength, however, injection pressure, injection temperature, injection speed and interaction of injection pressure and die temperature, had distinguished influence on density. The density and strength increased as injection pressure increased. The density decreased as injection temperature increased, but the strength nearly keep constant at 155-160℃,then decreased sharply beyond 160℃.The density and strength reached the best values when die temperature and injection speed are 30℃ and 60% respectively. The optimized injection parameters for rectangular with a dimension of 6.38mm × 6.38mm × 48mm are as followings: injection pressure 100MPa,injection temperature 155℃,injection speed 60% and die temperature 30℃.
 GERMAN R M, BOOKER P. Powder injection molding[J].Applied Mechanics Reviews, 1991,44(8): 134.  李松林,曲选辉,李益民,等.注射成形参数对PEG-PMMAP/Fe-2Ni喂料充模性能的影响[J].矿冶工程,2001,21(1):77-79.  ROSATO P V. Injection Molding Handbook [ M ].New York: Van Nostrand Reinhold, 1984. 634 - 656.  LAWLEY ALAN, SWANSON ARMOUR. Powder injection molding[A].Advances in Powder Metallurgy and Particulate Materials[C].New Jersey: MPIF, 1993,5:237 - 256.  QU Xuan-hui, LI Yi-min, YUE Hong-sheng ,et al. Numerical simulation of feedstock melt-filling in a cylindrical cavity with solidification in powder injection molding[J].Transactions of Nonferrous Metals Society of China, 1998,8 (4): 544 - 549.  DIHORU LUIZA V, SMITH LYNDON N, GERMAN R M. Experimental study and neural network modeling of the stability of powder injection molding feedstock[J].Materials and Manufacturing Processes,2000,15(3) :419 - 438.  李松林,李益民,曲选辉,等.金属注射成形尺寸精度的影响因素及其控制[J].粉末冶金工业,1998,5:7-11.  李益民,曲选辉,黄伯云,等.金属粉末注射成形技术进展[J].稀有金属材料与工程,1996,25(1):1-4.  李益民,黄伯云,钟伟,等.工艺参数对金属注射成形坯缺陷的影响[J].稀有金属材料与工程,1999,28(2):61-64.  李益民,曲选辉,黄伯云,等.多聚合物组元石蜡基MIM粘结剂的分步快速脱脂过程[J].稀有金属材料与工程,2000,29(1):46-49.  梅长林,周家良,等.实用统计方法[M].北京:科学出版社,2002. 218.  RICHARD T, DAEYONG LEE. Optimization of metal injection molding: experimental design [ J ].The International Journal of Powder Metallurgy, 1990,26 (3): 233 - 242.  陈魁.试验设计与分析[M].北京:清华大学出版社,1996.58.