Sand casting is one of the most traditional metal forming processes, using quartz sand or specialty sands combined with clay or resin binders to create molds. Through gravity or pressure pouring, it enables the production of metal components.

Core Features and Advantages

1. High Adaptability:

   • Capable of casting a wide range of metals, including cast iron, cast steel, and aluminum alloys, from a few kilograms to several hundred tons.
   • Ideal for producing oversized parts such as machine tool bases and ship propellers with unlimited wall thickness (starting from 3mm).

2. Cost-Effective:

   • Raw materials (sand and binders) cost only 10%-20% of precision casting.
   • Low tooling costs (wooden patterns or 3D-printed sand molds).
   • Suitable for high-volume production (up to tens of thousands of units).

3. Flexible Process Options:

   • Manual Molding: Suitable for custom single-piece production.
   • Machine Molding: High-efficiency production using static pressure production lines.
   • Supports integration of cold/hot core box techniques for creating complex internal cavities.

4. Eco-Friendly and Controllable:

   • Recycled sand usage rate of 90%-95% (through crushing, screening, and dust removal).
   • New inorganic binders reduce VOC emissions by over 50%.

5. Stable Quality:

   • Optimized gating and riser systems, combined with breathable sand molds (permeability >100), effectively control shrinkage and slag inclusion defects.
   • Casting yield rates exceed 95%.

Typical Applications

1. Heavy Machinery: Rolling mill frames and large machine tool bases.
2. Energy Equipment: Wind turbine hubs and large engine components.
3. Construction Hardware: Manhole covers, pipe fittings, and municipal infrastructure parts.
4. Art Castings: Large-scale sculptures and monuments.

Performance Considerations

• Precision and Surface Finish:

  • Dimensional tolerance: ±1.5mm (lower than precision casting).
  • Surface roughness: Ra 25-50μm (less smooth compared to investment casting).

• Core Advantages:

  • “Low-cost, large-size, highly compatible” capability.
  • Best suited for applications requiring cost sensitivity, high production volumes, or oversized/overweight components.

Industry Positioning

Sand casting remains indispensable in sectors such as heavy machinery, energy infrastructure, shipbuilding, and traditional industries. It is the preferred process for large cast iron and cast steel components, particularly for cost-sensitive, high-volume, or oversized/overweight metal products. Despite its limitations in precision and surface quality, its unmatched scalability continues to support the foundation of global industrial systems.