Principles and practice of low pressure-expendable pattern casting process for magnesium alloys  

作　　者：LI Ji-qiang FAN Zi-tian WU He-bao DONG Xuan-pu ZHANG Da-fu HUANG Nai-yu 

机构地区：[1]State Key Laboratory of Plastic Simulation and Die & Mold Technology, Huazhong University of Science and Technology, Wuhan 430074, P. R. China

出　　处：《China Foundry》2006年第4期293-296,共4页中国铸造（英文版）

基　　金：This research work is sponsored and supported by the NationalNatural Science Foundation of China. The item number is50275058

摘　　要：A newly developed low-pressure expendable pattern casting (LP-EPC) process was introduced and its basic principles or effect factors were further analyzed. According to theoretical calculation and experimental results, the major casting parameters that are of great and critical importance on the process include pressure and flux of filling gas, decomposition characteristic and density of foam pattern, thickness and permeability of coating, pouring temperature, vacuum degree and their combination. Most of casting defects can be effectively avoided by choosing the suitable parameters. The success achieved in pouring motor housing and exhaust manifold castings demonstrates the advantages of LP-EPC process in the production of high-complicated castings with high dimension accuracy.A newly developed low-pressure expendable pattern casting (LP-EPC) process was introduced and its basic principles or effect factors were further analyzed. According to theoretical calculation and experimental results, the major casting parameters that are of great and critical importance on the process include pressure and flux of filling gas, decomposition characteristic and density of foam pattern, thickness and permeability of coating, pouring temperature, vacuum degree and their combination. Most of casting defects can be effectively avoided by choosing the suitable parameters. The success achieved in pouring motor housing and exhaust manifold castings demonstrates the advantages of LP-EPC process in the production of high-complicated castings with high dimension accuracy.

关 键 词：MAGNESIUM alloys vacuum SUCKING CASTING LOW-PRESSURE CASTING expendable pattern CASTING 

分 类 号：TG249[金属学及工艺—铸造]