Investment casting, also known as precision casting, is a manufacturing process where molten metal is poured into a ceramic mold to create highly accurate and complex parts.
It is widely applied in aerospace, automotive, medical devices, energy, and industrial machinery industries where high precision and excellent surface finish are required.

How Investment Casting Works

Wax Injection 
Molten wax is injected into a precision mold to form wax patterns, which replicate the final product’s shape.

Wax Pattern Assembly 
The wax patterns are carefully trimmed and assembled onto a central wax runner, forming a “tree” structure.

Shell Building 
The wax assembly is repeatedly dipped in ceramic slurry and coated with sand, then dried to form a strong ceramic shell.

Dewaxing 
The wax inside the ceramic shell is melted and removed, leaving a hollow mold cavity.

Metal Melting & Pouring 
The selected alloy is melted at high temperature and poured into the ceramic mold.

Shell Removal 

Once solidified, the ceramic shell is broken away to release the cast metal parts.

Gate Cutting & Grinding 

The parts are separated from the casting tree and excess material is removed.

Surface Finishing 

The castings undergo processes such as shot blasting, grinding, straightening, and sandblasting to achieve the required surface quality and dimensional accuracy.

Advantages of Investment Casting

• High Dimensional Precision – Tolerances up to CT4–CT6.

• Superior Surface Finish – Roughness Ra 1.6–6.3 μm.

• Material Versatility – Stainless steel, carbon steel and more.

• Complex Design Capability – Ideal for shapes difficult to machine.

• Cost Efficiency – Less material waste, suitable for small to medium production runs.

Factors Affecting Casting Quality

1. Metal Pouring Temperature – Influences mold filling and material properties.

2. Shell Strength & Permeability – Determines surface smoothness and accuracy.

3. Cooling Rate – Affects grain structure and mechanical strength.

4. Post-Treatment – Heat treatment and machining enhance final performance.

Typical Investment Casting Products

• Aerospace turbine blades and structural parts

• Automotive turbocharger wheels and exhaust components

• Energy and power turbine housings, pumps, and valves

• Medical implants and surgical instruments

• Hydraulic parts and industrial machinery components

Suitable for Production

• Batch Size: Ideal for small to medium runs

• Quality: High precision, repeatable consistency

• Production Speed: Longer cycle than plastic injection molding, but ensures superior accuracy

Your Trusted Investment Casting Supplier

At Accurtek, we deliver custom investment casting solutions with high accuracy and consistent quality. Our expertise in precision metal casting helps clients reduce costs, achieve complex designs, and ensure reliable performance.

📩 Looking for a reliable investment casting supplier?
Contact Accurtek today to discuss your project.