Analysis and Research on Vein Defect of Investment Casting
Author of the article:ZHU Weijie;PAN Yuhong
Author's Workplace：Wuxi Xuelang Alloy Steel Foundry,Wuxi 214161,China;Wuxi Kaisite Casting Industry Co.,Ltd.,Wuxi 214161, China
Key Words：investment casting veining defect improvement measures
Abstract：
Veins were one of the common defects of investment casting. The defects of positive and negative veins and their main causes were analyzed. The main reason for the positive veins is that the inner surface layer of the shell has a fine fiber network or a slightly coarser vein-like gap;The second is the metal liquid pouring speed is too fast or the static pressure head is too high. The main reason for the reverse vein pattern is that the surface layer inside the shell is stratified.Under the action of the metal liquid during pouring, a fine fiber network or slightly coarser vein-like swelling is generated,and the reverse vein pattern is generated. On this basis, the corresponding improvement measures are put forward, and the relationship and difference between "positive vein pattern" and "hairy wing" and "reverse vein pattern" and "rat tail" are analyzed.
