Sand Casting - Excellence and Versatility by Donghua

Donghua (DH) specializes in sand casting, a metal-forming process that involves the creation of a mold from a 3D sand pattern, which is subsequently filled with molten metal to produce the casting.

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Capabilities

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Our expertise extends to both automatic and manual molding operations for green and resin sand casting. Leveraging state-of-the-art equipment and extensive experience, we produce a vast array of sand castings with weights ranging from 1kg to 0.5 tons. We accommodate various material specifications to produce sand castings using a diverse range of materials, including carbon steel, steel alloy, stainless steel, cast iron, brass, and aluminum.

 

To ensure the highest quality products, we conduct comprehensive on-site testing with premium inspection equipment:

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• Spectrographic and manual quantitative analysis

• Carbon sulfur analysis

• Coordinate Measuring Machine (CMM)

• Metallographic analysis

• Hardness testing

• Mechanical property analysis

• Hydraulic testing

• Leak detection

• Impact testing

• Salt spray testing

• Paint thickness testing

• Non-Destructive Testing (NDT) including X-ray, Magnetic Particle Testing (MT), and Ultrasonic Testing (UT)

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Process

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1. Mold making

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A pattern is placed in a sandbox, and resin is mixed using resin sand processing machines. The mixture is then injected into the sandbox containing the pattern and gating features. The mold is heated to a high temperature, allowing the sand to harden. The pattern and gating features are then removed.