Thursday, January 17, 2019

TYPES OF CASTING PROCESS

TYPES OF CASTING PROCESS


Pore-free casting
When no porosity is required for a 
casting then the pore-free casting process is used. It is identical to the standard process except oxygen is injected into the die before each shot. This causes small dispersed oxides to form when the molten metal fills the dies, which virtually eliminates gas porosity. An added advantage to this is greater strength. These castings can still be heat treated and welded. This process can be performed on aluminumzinc, and lead alloys.


Heated-manifold direct-injection die casting
Heated-manifold direct-injection 
die casting, also known as direct-injection die casting or runnerless die casting, is a zinc die casting process where molten zinc is forced through a heated manifold and then through heated mini-nozzles, which lead into the molding cavity. This process has the advantages of lower cost per part, through the reduction of scrap (by the elimination of sprues, gates and runners) and energy conservation, and better surface quality through slow cooling cycles.


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