Shenzhen Alu Rapid Prototype Precision Co., Ltd.

Vacuum permanent-mold casting (also known as vacuum-assisted permanent mold casting) builds on the benefits of standard gravity or low-pressure permanent mold casting by applying a vacuum to the mold cavity. This draws molten metal in with negative pressure, offering several additional advantages:

1.Reduced porosity and gas entrapment — The vacuum removes air and gases from the mold cavity and degasses the molten metal, minimizing dissolved gases, gas porosity, and related defects like dross formation. This results in denser, cleaner castings with fewer inclusions.

2.Improved mechanical properties — Lower porosity and more controlled solidification lead to higher strength, better ductility, and overall superior mechanical performance—often 5-15% better than gravity permanent mold castings, with even greater gains over basic methods.

3.Better mold filling for complex or thin-walled parts — The suction effect enhances metal flow, enabling thinner walls, intricate geometries, and finer details that are difficult to achieve reliably with gravity or low-pressure methods alone. It reduces turbulence for tranquil filling.

4.Enhanced surface finish and dimensional accuracy — Minimized defects and controlled filling contribute to smoother surfaces, tighter tolerances, and higher consistency, making it ideal for precision components.

5.Increased molten metal cleanliness — By reducing oxidation and gas interactions, the process improves material purity, which is particularly beneficial for critical applications in aerospace, automotive, or high-performance parts.

These advantages make vacuum permanent-mold casting especially suitable for high-integrity, thin-walled, or complex castings where standard permanent mold processes may fall short due to porosity or filling issues.