What Are the Common Manufacturing Methods for Aluminum Castings?

Multiple mature molding processes are available for aluminum castings,selected based on part volume,precision requirement and production scale.High-pressure die casting adopts metal molds with fast injection filling,featuring high surface smoothness,tight dimensional tolerance and ultra-high mass production efficiency,best for standardized thin-shell electronic and automotive parts.Sand casting uses disposable sand molds,supporting oversized,thick-wall and irregular complex structures,suitable for small-batch custom heavy-duty cast components with lower upfront mold investment.Gravity permanent mold casting relies on natural liquid flow filling metal molds,delivering fewer internal void defects and better mechanical performance,widely used for structural parts requiring air tightness.Low-pressure casting controls filling speed via stable air pressure,effectively reducing gas entrapment and shrinkage porosity,prioritized for sealing parts such as pump bodies and valve housings.Each method has distinct advantages and defect control difficulty to match different product design standards.