The Comparison of Intensive Riser Cooling of Castings After Solidification in Three Classic Metals

摘要

The cooling of castings especially heavy steel castings was usually very slow and nonuniform after solidification, which results in low production efficiency and great residual stress or deformation. Furthermore, great thermal gradient appears across their thick sections and between the thick and thin areas, which may cause significant residual stress or deformation or even cracks. So as to solve this dilemma, we come up with a new method to make the riser useful and realize the castings rapid, inside-out and uniform cooling. It was named the post solidification intensive riser cooling technology (PSIRC). In this paper, the effect of PSIRC was investigated for three different alloys GS38 carbon steel, H13 alloy steel and A356 aluminium alloy by using stress frame castings. The results show that PSIRC could improve production efficiency and temperature uniform of the castings made of these three materials. For the improvement of cooling rate, it ranks from GS38 carbon steel, H13 alloy steel to A356 Al alloy. While for improving temperature uniform, the order is A356 Al alloy, GS38 carbon steel and H13 alloy steel. The effect of PSIRC mainly depends on the thermal conductivity of castings, high thermal conductivity means more cooling efficiency.