High precision metal products with complex structures can be precisely cast, and fine patterns and hollow designs can be achieved through the plasticity of wax molds, but the process steps are strict and the cost is high. The following is a summary of specific characteristics: 12

High precision and surface smoothness

The dimensional accuracy of castings can reach 5-7 levels, with surface roughness as low as Ra25-6.3 μ m, and can cast thin-walled (minimum 0.5mm) or micro small parts (only a few grams).

By directly molding with wax molds, it avoids the loss of traditional clay mold demolding and can faithfully replicate the details of wax molds, such as the hollow dragon pattern on the plate of Marquis Yi Zun of the Warring States period.

Adaptability to complex shapes

It can cast multiple curved surfaces, transparent structures, and fine patterns, such as the three-dimensional transparent carving of cloud patterned copper, overcoming the limitations of the mud mold method in producing complex parting surfaces.

Support the overall casting of composite or welded parts to reduce part weight and processing costs, such as the combination of rough casting and separate casting processes for the Zenghou Yizun disk.

Strictness of craftsmanship and diversity of materials

The steps require strict control over the precision of wax mold carving, ingredient ratio, and casting temperature, as there are many interfering factors (such as melting control of silicone molds).

Suitable for a wide range of metal types, including precious metals such as bronze, gold and silver, as well as industrial materials such as alloy steel and heat-resistant alloys.

Historical Inheritance and Modern Application

During the Shang and Zhou dynasties, it gradually evolved through the "burning and losing method", with a complete technological chain and conclusive evidence of its local origin.

Modern technology is still used in fields such as jewelry, dentistry, aviation, etc., such as investment casting precision technology, which is its derivative technology.

Example: The Zeng Hou Yi Zun plate unearthed in Suizhou, Hubei Province, features a multi-layered hollow structure and coiled dragon patterns, showcasing the advanced craftsmanship of the lost wax method during the Warring States period.