Centrifugal Castings
Centrifugal casting pours molten metal into a spinning mould so centrifugal force pushes the metal outward, forming dense, defect-free cylindrical parts such as bushes, sleeves, liners and rings. Impurities collect at the bore and are machined away.
What it is
The mould rotates at high speed while metal is poured; the metal forms a tube against the mould wall and solidifies from the outside in. The resulting structure is fine-grained and dense, with excellent mechanical properties.
It is especially suited to bronze bushes and bearings, cylinder liners, pipes and rings.
Typical applications
- Bronze bushes and bearings
- Cylinder and pump liners
- Pipes and tubes
- Rings, sleeves and gear blanks
- Roller shells
Suitable materials
- Bronze (phosphor, aluminium, leaded)
- Grey and ductile iron
- Stainless and alloy steel
- Copper alloys
Points to consider
- Best for rotationally symmetric parts only.
- Bores are machined to remove the inner layer where impurities collect.
- Supplied rough-machined or finish-machined to drawing.
- Material choice depends on wear, load and lubrication.
Frequently asked questions
Why use centrifugal casting for bushes?
It gives dense, porosity-free bronze with excellent bearing properties, better than static casting for bushes and sleeves.
What shapes can be centrifugally cast?
Rotationally symmetric shapes such as tubes, rings, sleeves and liners.
Are centrifugal castings machined?
Yes. They are typically machined on the bore and outside to final size, which also removes the inner impurity layer.