Adjustment of chills and risers during cast iron platform forging

Utilization of chills in forging of cast iron platforms:

1. Classification:

Non-chill: Only contacts the outer surface of the casting and plays a role in rapid cooling, cleared together with the mold sand, not reused.

Internal chill: After pouring, the chill is surrounded by molten metal and fuses with the casting. Cannot be used in areas requiring gas tightness.

2. Functions:

(1) Improve the hardness and wear resistance of the casting: Use external chills to accelerate cooling, refine the structure, and increase hardness.

(2) Can reduce the size of the riser: Add internal chills to speed up the cooling of the casting.

(3) Eliminate shrinkage porosity and shrinkage cavities at local hot spots: Add external chills.

(4) Prevent cracks in the casting: Simultaneous solidification, such as placing chills at the intersection of two walls to eliminate hot spots.

(5) Reduce the number of risers: Improve the solidification sequence, beneficial for external shrinkage in cast iron platforms.