Measures to prevent oxide inclusions: Strictly control the smelting process, smelt rapidly, reduce oxidation, and thoroughly remove slag. Aluminum-magnesium alloys must be melted under a covering agent. The furnace body and tools should be clean, free of oxides, and preheated; paint should be dried after application. The designed casting system must have stable flow, buffering, and skimming capabilities. An inclined gating system should be used to ensure stable liquid flow and prevent secondary oxidation. The selected coating should have strong adhesion, and the slag should form within the casting during pouring without peeling.
Measures to prevent hot cracking: In actual gating systems, localized overheating should be avoided to reduce internal stress. The mold and core slope must ensure the above 5°. Inverted risers can be cored after solidification; sand cores can replace metal cores when necessary. Control the coating thickness to ensure consistent casting cooling rates. Select an appropriate mold temperature based on the casting thickness. Refine the alloy microstructure to improve hot cracking resistance. Improve the casting structure, eliminate sharp corners and abrupt changes in wall thickness, and reduce the tendency for hot cracking.
Measures to prevent loose casting: Proper riser setup to ensure solidification and shrinkage capacity. Appropriately reduce the operating temperature of the metal mold. Control coating thickness, thinning thick-walled castings. Adjust the cooling rate of each component of the metal mold to maximize the cooling capacity of thick-walled castings. Appropriately reduce the metal pouring temperature.
