Large-size aluminum vacuum housing sand casting is a specialized manufacturing process used to create robust, low-porosity, and complex components for industrial vacuum applications. This process typically involves either high-end no-bake (air set) sand casting for large, heavy parts.

Key Features of Aluminum Sand Cast Vacuum Housings

• High Integrity Alloy: Commonly produced using high-quality aluminum alloys like A356  often heat-treated to a T6 condition for enhanced strength and pressure tightness.

• Large Size Capacity: Suitable for producing parts ranging from large blower housings (e.g., 24 inches wide) to large industrial, rectangular, or complex vacuum chambers.

• High Vacuum Compatibility: When properly cast, these housings can hold high vacuum levels (e.g., up to 29.9" Hg).

• Dimensional Stability: The use of rigid sand molds (specifically V-process or no-bake) ensures consistent dimensions and structural integrity. 

Primary Casting Methods

• No-Bake/Air Set Sand Casting:

• Description: A mixture of sand and a fast-curing chemical binder is used to form the mold.

• Benefits: Excellent for large-volume, complex geometries, and often used for heavy-duty industrial housings

• Cost-Effective Tooling: Significantly lower initial setup costs for large parts compared to die casting.

• Reduced Porosity: The use of vacuum during the pour (in V-process) results in fewer gas holes, which is crucial for maintaining a vacuum.

• Design Flexibility: Can create complex, intricate internal features using cores.

• Good Machinability: Aluminum is easily finished to meet tight sealing tolerances. 

Typical Applications

• Large industrial vacuum chambers for degassing, resin infiltration, or manufacturing.

• Large industrial blower housings.

• Hollow electronics housings.

• Research and development equipment (e.g., test chambers). 

These vacuum housings are frequently used for applications where helium leak tightness is required