In high-end industries such as automotive, hydraulic systems, mechanical components, and pressure-tight applications, internal quality is the foundation of performance and reliability. Porosity, gas holes, and shrinkage cavities are the most common defects that can lead to leakage, failure during machining, or even premature part failure.

At our company, we specialize in gravity casting and have developed a complete quality control system to produce aluminum castings with dense internal structure, minimal porosity, and controlled shrinkage.

1. Optimized Mould & Gating System Design

We design smooth gating systems to ensure stable filling of molten aluminum, avoiding turbulence, splashing, and air entrapment. Strategic venting channels and exhaust plugs are placed at key positions to allow gas to escape efficiently. This greatly reduces gas porosity from the very beginning.

2. Strict Melting & Degassing Process

Hydrogen and inclusions are the main causes of porosity in aluminum castings. We implement strict melting standards:

· Professional degassing using inert gas

· Slag removal and filtration

· Precise temperature control to minimize hydrogen absorption

Only clean, pure molten aluminum is used for casting.

3. Sequential Solidification Technology

Shrinkage porosity occurs when thick sections cool too late and lack feeding. Our gravity casting process uses sequential solidification by controlling mould temperature, cooling systems, and riser design. This ensures molten aluminum continuously feeds the casting as it solidifies, effectively eliminating shrinkage cavities.

4. Stable Process & Full Inspection

We maintain stable, repeatable parameters for every production run. Internal quality is verified through:

· Visual inspection

· Pressure testing

· X-ray inspection (optional)

· Machining validation

Every batch is traceable and meets international quality standards.

Conclusion

A truly reliable casting is not only beautiful on the surface, but strong and consistent inside.

Through professional mould design, refined melting, sequential solidification, and strict quality control, our gravity casting technology delivers high-density, low-defect, and high-performance aluminum castings that improve your product stability and reduce rejection rates.

We are your trusted partner for high-quality aluminum gravity casting solutions.