Low Pressure Aluminum Die Casting Processing

What is Low Pressure Aluminum Die Casting Processing?

Low pressure aluminum die casting processing is a production method that uses pressure, rather than gravity, to fill molds with molten metals such as aluminum and magnesium. During this process, the holding furnace is located below the casting, and the liquid metal is forced up through the riser tube into the cavity. Pressure is applied continuously, sometimes gradually, to fill the mold and hold the metal in place within the mold until it solidifies. Once the casting has solidified, the pressure is released and any remaining liquid in the tube or cavity flows back into the holding furnace for “recycling”. Once cooled, simply remove the casting.

Advantages of Low Pressure Aluminum Die Casting Processing:

This method allows precise control of the filling process. Injecting molten metal in this manner reduces oxide formation and reduces porosity, ensuring excellent top-to-bottom consistency. Low-pressure casting thus achieves excellent density and strength values as well as excellent dimensional accuracy. While this method works well for simpler, symmetrical forms, more complex geometries can be achieved by using sand cores within the mold. With the advantages of uncomplicated machinery and technology, the low pressure aluminum die casting processing is very suitable for automation.

For decades, the automotive industry has relied on low-pressure die casting to create strong, high-quality aluminum castings. Although low-pressure casting is a particular choice for automotive components such as engine blocks, wheels, and suspension components, non-automotive industries such as electronics, machine manufacturing, and plumbing components also benefit from its lower tooling costs, high production volumes, and superior metallurgy quality.