Difference between pressurised and unpressurised gating system
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The assembly of channels which facilitates the molten metal to enter into the mold cavity is called the gating system . Alternatively, the gating system refers to all passage ways through which molten metal passes to enter into the mold cavity. The nomenclature of gating system depends upon the function of different channels which they perform.
Down gates or sprueCross gates or runnersIngates or gates
Goals of Gating System
The goals for the gating system are
To minimize turbulence to avoid trapping gasses into the mold
To get enough metal into the mold cavity before the metal starts to solidify
To avoid shrinkage
Establish the best possible temperature gradient in the solidifying casting so that the shrinkage if occurs must be in the gating system not in the required cast part.
Incorporates a system for trapping the non-metallic inclusions
Hydraulic Principles used in the Gating System
Down gates or sprueCross gates or runnersIngates or gates
Goals of Gating System
The goals for the gating system are
To minimize turbulence to avoid trapping gasses into the mold
To get enough metal into the mold cavity before the metal starts to solidify
To avoid shrinkage
Establish the best possible temperature gradient in the solidifying casting so that the shrinkage if occurs must be in the gating system not in the required cast part.
Incorporates a system for trapping the non-metallic inclusions
Hydraulic Principles used in the Gating System
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