What Is Centrifugal Casting?

Centrifugal casting is a metal casting process that uses centrifugal force generated by high-speed rotation to distribute molten metal along the mold wall.

Compared with conventional sand casting or gravity casting, centrifugal casting can significantly improve metal density and reduce common casting defects such as shrinkage cavities, gas porosity and inclusions.

Because of these advantages, centrifugal casting is widely used for manufacturing cylindrical and hollow components, including bronze bushings, copper alloy sleeves, cylinder liners, pipes and industrial rings.

For many foundries producing sleeve-type components, choosing the right centrifugal casting machine is often the key factor affecting product quality, production efficiency and long-term operating cost.

How Does the Centrifugal Casting Process Work?

Although the principle of centrifugal casting is relatively simple, stable production requires proper control of several important factors, including mold design, pouring temperature, rotation speed and cooling conditions.

The typical centrifugal casting process includes the following steps:

1. Mold Preparation

Before casting, the mold surface needs to be properly prepared.

The mold condition directly affects:

• Surface quality of the casting;

• Metal solidification behavior;

• Casting dimensional accuracy;

• Mold service life.

For different materials such as bronze, brass, cast iron or steel, the mold coating, preheating temperature and preparation method may be different.

A properly prepared mold helps achieve stable casting quality and reduces production problems.

2. Molten Metal Pouring

After the mold reaches the required working condition, molten metal is poured into the rotating mold.

Under centrifugal force, the molten metal is pushed against the inner mold wall and gradually solidifies from the outside toward the inside.

This solidification method helps form a dense outer structure and improves the mechanical properties of the casting.

3. Solidification and Cooling

During solidification, rotation speed and cooling conditions have a direct impact on casting quality.

Incorrect process parameters may cause:

• Uneven wall thickness;

• Internal defects;

• Material segregation;

• Difficult machining.

Therefore, centrifugal casting production is not only about rotating the mold but also requires proper coordination between equipment parameters and casting technology.

4. Casting Removal and Finishing

After solidification, the casting is removed from the mold and prepared for further processing.

Depending on the application, additional processes may include:

• Machining;

• Heat treatment;

• Surface finishing;

• Quality inspection.

For industrial components such as bronze bushings and cylinder liners, stable casting quality can greatly reduce machining allowance and material waste.

Horizontal and Vertical Centrifugal Casting Machines

Different casting products require different types of centrifugal casting equipment.

Horizontal Centrifugal Casting Machines

Horizontal centrifugal casting machines are mainly used for producing long cylindrical components, such as:

• Bronze bushings;

• Bearing sleeves;

• Copper alloy sleeves;

• Cylinder liners;

• Pipes and tubes.

WELTOP J51 series horizontal cantilever centrifugal casting machines are designed for this type of application.

The equipment provides:

• Stable rotation;

• Adjustable speed control;

• Hydraulic extraction system;

• Customized mold solutions.

They are widely used by foundries producing cylindrical castings with high requirements for density and dimensional accuracy.

Vertical Centrifugal Casting Machines

Vertical centrifugal casting machines are generally suitable for shorter cylindrical parts, rings, flanges and disc-type components.

Typical applications include:

• Flange rings;

• Short bushings;

• Ring-shaped castings;

• Special industrial components.

The selection between horizontal and vertical centrifugal casting machines depends mainly on:

• Casting diameter;

• Casting length;

• Material type;

• Production volume;

• Product requirements.

Applications of Centrifugal Casting

Centrifugal casting technology is widely used in industries requiring high-density cylindrical metal components.

Bronze Bushings and Bearing Sleeves

Bronze bushings are one of the most common applications of centrifugal casting.

Materials such as:

• SAE660 bronze;

• C93200 bronze;

• C83600 brass;

• Other copper alloys

can achieve excellent wear resistance and structural consistency through centrifugal casting.

Compared with traditional casting methods, centrifugal casting helps reduce internal defects and improves the service life of bushings.

Cylinder Liners

Centrifugal casting is also widely used for manufacturing cylinder liners for engines and industrial equipment.

The process provides:

• Dense casting structure;

• Good wear resistance;

• Stable wall thickness;

• Suitable machining performance.

Other Industrial Components

Other applications include:

• Copper alloy sleeves;

• Steel rings;

• Industrial tubes;

• Wear-resistant components;

• Special hollow castings.

How to Choose the Right Centrifugal Casting Machine?

Selecting a centrifugal casting machine should not only consider the maximum diameter range.

A suitable machine configuration should be evaluated according to:

Casting Dimensions

Important parameters include:

• Outer diameter;

• Inner diameter;

• Length;

• Wall thickness.

Material Requirements

Different materials require different process conditions.

For example:

• Bronze and copper alloys require suitable rotation speed and mold temperature control;

• Cast iron and steel require higher equipment load capacity and process stability.

Production Capacity

The required machine depends on:

• Annual production volume;

• Casting cycle time;

• Automation requirements;

• Number of molds.

For high-volume production, automatic centrifugal casting lines can further improve efficiency and reduce labor dependence.

WELTOP Centrifugal Casting Solutions

WELTOP Machinery specializes in centrifugal casting equipment and customized foundry solutions.

Our product range includes:

• Horizontal cantilever centrifugal casting machines;

• Automatic centrifugal casting production lines;

• Centrifugal casting molds;

• Customized casting solutions.

The J51 series centrifugal casting machines are widely used for producing:

• Bronze bushings;

• Copper alloy sleeves;

• Cylinder liners;

• Industrial hollow castings.

Based on casting dimensions, materials and production requirements, WELTOP provides suitable equipment recommendations and customized solutions for foundries worldwide.

Conclusion

Centrifugal casting is not simply a process of rotating molten metal. Stable production depends on the combination of suitable equipment, correct process parameters and properly designed molds.

For foundries producing bronze bushings, copper alloy sleeves, cylinder liners and other cylindrical castings, selecting the right centrifugal casting machine can directly influence product quality, production efficiency and manufacturing cost.