Centrifugal casting is one of the most reliable manufacturing processes for producing high-quality cylindrical components. By using centrifugal force during solidification, this process delivers castings with excellent density, superior mechanical properties, and improved dimensional consistency.

It is widely used for manufacturing:

• Bronze bushings

• Bearing sleeves

• Cylinder liners

• Steel and alloy sleeves

• Copper alloy tubes

• Rings and tubular castings

For foundries aiming to improve productivity and casting quality, understanding each step of the centrifugal casting process is essential.

Step 1 – Mold Selection

Selecting the appropriate mold is the foundation of a successful casting process.

Factors such as casting dimensions, alloy type, wall thickness, production volume, and rotational load should all be considered when choosing the mold.

A properly designed mold contributes directly to stable production and longer service life.

Step 2 – Mold Preheating

Preheating the mold before pouring helps achieve a stable casting temperature.

Proper mold temperature can:

• Reduce thermal shock

• Improve metal flow

• Minimize casting defects

• Extend mold life

For different alloys, the preheating temperature should be optimized according to the casting process.

Step 3 – Mold Coating Preparation

Before casting, a refractory coating is applied to the mold surface.

The coating serves several important functions:

• Prevents metal adhesion

• Improves casting surface finish

• Controls heat transfer

• Extends mold service life

The coating material and application thickness should be selected according to the casting material and production requirements.

Step 4 – Molten Metal Preparation and Pouring

Molten metal quality has a direct impact on casting performance.

Proper control of:

• Melting temperature

• Chemical composition

• Pouring temperature

• Pouring speed

helps ensure consistent casting quality.

During centrifugal casting, molten metal is poured into the rotating mold where centrifugal force distributes the metal evenly along the mold wall.

Step 5 – Controlled Cooling

Cooling is not simply a waiting process.

Controlled cooling determines:

• Grain structure

• Mechanical properties

• Internal soundness

• Dimensional stability

Different materials require different cooling strategies to achieve the desired metallurgical properties.

Step 6 – Casting Removal

After solidification, the casting is removed from the mold.

Depending on the casting size and production capacity, extraction can be performed manually or with dedicated hydraulic or pneumatic ejecting systems.

Proper extraction helps protect both the casting and the mold.

Step 7 – Surface Cleaning and Inspection

The casting then undergoes cleaning and inspection.

Typical operations include:

• Shot blasting

• Surface cleaning

• Visual inspection

• Dimensional inspection

• Non-destructive testing (when required)

Quality inspection ensures that every casting meets the required technical specifications before machining.

Step 8 – Machining

The final machining process produces the required dimensions and surface finish.

Depending on the application, machining may include:

• Turning

• Boring

• Facing

• Grinding

The finished casting is then ready for assembly or delivery to the customer.

Why Process Stability Matters

Many people believe centrifugal casting quality depends mainly on rotational speed.

In reality, consistent quality results from the combination of:

• Proper mold design

• Stable mold temperature

• Accurate pouring control

• Controlled cooling

• Reliable machine performance

Each stage directly influences the final casting quality, production efficiency, and manufacturing cost.

WELTOP Centrifugal Casting Solutions

At WELTOP Machinery, we specialize in the design and manufacture of centrifugal casting equipment for foundries worldwide.

Our product range includes:

• Horizontal Cantilever Centrifugal Casting Machines

• Horizontal Roller-Type Centrifugal Casting Machines

• Vertical Centrifugal Casting Machines

• Automated Centrifugal Casting Production Lines

• Customized Molds and Tooling

Our equipment is widely used for producing bronze bushings, copper alloy sleeves, cylinder liners, steel sleeves, and other cylindrical castings.

Whether you are planning a new foundry or upgrading an existing production line, WELTOP can provide customized centrifugal casting solutions based on your casting dimensions, alloy, and production capacity.