2017 Volume 58 Issue 1 Pages 85-90
Core pins and core blocks are frequently used for aluminum alloy die-casting to produce net-shape parts and/or to prevent the parts from shrinkage in thick casting sections. However, for large casting, some other problems such as soldering of core pin due to insufficient cooling, leakage, etc. may also arise. The authors have studied the heat flow from casting to core pin under various casting conditions and developed an efficient cooling system. This paper reports the optimization of thin wall core pin shape from the perspective of heat flow and mechanicals of core pin. The optimum cooling channel diameter of the core pin should be 70 percent of the outer diameter of the core pin. This thin wall core pin in combination with high pressure water cooling would eliminate soldering and would give a longer core pin life than that of conventional solid core pin without internal cooling.