Shell Moulding Casting

China Shell Molding Casting Foundry & OEM Services

Shell moulding (also known as shell mold casting) is an expendable mold casting process that uses resin-covered sand to form the mold. As a premier shell moulding foundry in China, Hengchang specializes in providing high-precision OEM shell mold casting solutions for global clients. Whether you need custom mechanical parts or wholesale shell mold casting production, our factory delivers exceptional quality.

Compared to traditional sand casting, our China shell molding casting process offers better dimensional accuracy, a higher productivity rate, and lower labor requirements. It is ideal for small to medium parts with complex geometries. The reusable metal pattern allows for high-volume shell casting production with stable, repeatable results.

What Material We Cast Using Shell Molding

Grey Iron: HT150, HT200, HT250; EN-GJL-100, EN-GJL-150, EN-GJL-200, EN-GJL-250, EN-GJL-300; GG15, GG20, GG25, GG30

Ductile Cast Iron: GGG40, GGG45, GGG50, GGG60, GGG70, GGG80; EN-GJS-400-10, EN-GJS-40-15, EN-GJS-40-18, EN-GJS-500-7, EN-GJS-600-3, EN-GJS-700-2, EN-GJS-800-2; QT400-18, QT450-10, QT500-7, QT600-3, QT700-2, QT800-2

How We Inspect Our Shell Moulding Castings

Quality is our priority. Our ARL360 Spectrometer checks 20 chemical elements, and our metallurgical microscope produces high-resolution images magnified 1,000 times. Hengchang has a full range of in-house inspection capabilities for every shell mould casting order, which include:

• 1) Spectrographic and manual quantitative analysis
• 2) Metallographic analysis
• 3) Brinell, Rockwell hardness inspection
• 4) Mechanical property analysis
• 5) Visual test and dimensional checking

The Shell Mold Casting Process

• 1) Making Metal Patterns: The pattern is typically composed of two pieces of different metals, namely iron or steel, machined into the desired shape for the finished component.
• 2) Making the Shell Mold: The pattern is heated to the required degree and covered in resin-coated sand. The sand grains bind together to form a hardened shell. After a short curing time, the excess sand is poured out, leaving a hollow shell cavity.
• 3) Assembling the Shell Molds: The two shell halves are joined together using glue or other fasteners and securely clamped before being placed into a pouring flask.
• 4) Pouring Molten Metal: Pouring the molten iron into the shell mold's cavity to fill the shape.
• 5) Removing the Castings: After the molten metal has cooled and solidified, the outer sand shell is broken up, and the finished shell casting is removed for cleaning.

Advantages of Hengchang's Shell Mold Casting

• 1) High Efficiency: It can be highly automated, which lowers labor costs and facilitates fast, wholesale mass production.
• 2) Excellent Permeability: As no moisture is present in the shell, very few gases are produced, and those that are can escape easily through the thin, permeable sand walls, reducing porosity defects.
• 3) Superior Surface Finish: The surface quality is compact and smooth. Typical tolerances can reach CT7-CT8, and the surface roughness can reach 0.3-4.0 micrometers, minimizing the need for secondary machining.
• 4) Good Collapsibility: The shell breaks away easily after pouring, which is conducive to fast casting cleaning and improving product performance.
• 5) Cost-Effective Tooling: Tooling costs are relatively low, and short lead times are achievable for OEM clients.