Application of the forced cooling in the mold for prevention of the occurrences of metal penetration

摘要

Among the steel castings by using the sand mold, particularly of heavy thickness and large mass, metal penetration often occurs on the product surface toward the core mold. Generally, in order to prevent the occurrences of metal penetration, the thick coating of mold wash ( known as Surfacer ) and/or the high refractory sand has been applied in our foundry shop. But, it is not so effective as an Extra-high temperature portion, so called as Hot Spot where a core is surrounded by melted steel, and the occurrence has not been prevented. It takes a large amount of worktime to remove the zone of metal penetration, and it makes the productivity stay low.We'd like to report herein on the prevention of metal penetration by using the forcedcooling at Hot Spot.