The centrifugal casting process employs centrifugal force—rather than gravity or applied pressure—to produce cast hollow cylindrical partsr and products. During such casting operations, the mold rotates at high speeds about its central axis as molten metal pours into it. The rotation of the mold creates centrifugal force, which pushes and keeps the metal to the mold’s outer wall. Once the metal has cooled and solidified, the mold can cease its spinning and the solid part can be removed. In addition to constructing the desired part, the centrifugal force also facilitates the removal of contaminants from the construction material, as the lighter compounds—such as . slag oxidel—separate from the metal and move towards the center of the mold.
Types of Centrifugal Casting
Industry professionals employ several types of centrifugal casting depending on the part and production specifications required, such as:
True Centrifugal Casting
True centrifugal casting—the standard centrifugal casting method—is used to create symmetrical round hollow parts, such pipes and tubes. The process does not require the use of cores; it creates the parts through pure centrifugal force generated by continuous rotation along the horizontal or vertical axis. The centrifugal force drives the molten metal to the outer walls while contaminants converge in the center. Once the metal solidifies, the piece can be removed from the mold and the unwanted materials removed through machining operations. ..
Semi-centrifugal casting is used to produce larger parts that are symmetrical along the vertical axis, such as gear blanks and flywheels. The mold used is arranged horizontally and then rotated. While the process generates sufficient levels of centrifugal force to cast the outer walls, it needs a core positioned in the center of the mold to cast the hollow section.
Centrifuging casting is used to cast small objects that are not axis symmetrical in shape. The process forms the desired parts by utilizing specialized molds—with several cavities connected by a central sprue with radial gates—and solidifying the molten material using higher pressures.
Benefits of Centrifugal Casting
Compared to other casting methods, centrifugal casting offers several manufacturing benefits, such as:
Better Physical Properties
The centrifugal casting process produces parts with denser and closer grained structures. The uniformity of the structure achieved results in superior physical properties—e.g., tensile strength, yield strength, and elongation—that are up to 30% better than those attained by conventional gravity or static casting methods.
The superior physical properties of parts produced by centrifugal casting translate to better durability and reliability. Both qualities contribute to a longer service life.
Higher Part and Production Quality
As the centrifugal casting process separates contaminants and other unwanted compounds from the casting material, the resulting metal—and therefore the part produced—is generally much higher quality.
Lower Manufacturing Costs
Centrifugal castings have better physical properties and lower risk of part deformity, both of which contribute to lower material waste (due to less rejected parts) and secondary machining requirements (due to better part quality). These, in turn, result in lower overall manufacturing costs.
Greater Production Flexibility
The centrifugal casting process serves as a cost-effective production method for parts and products in a wide range of sizes, shapes, and quantities.
The quick set up and preparation time associated with the centrifugal casting process reduces both manufacturing costs and lead time.
Applications of Centrifugal Casting
The centrifugal casting process accommodates the part and production requirements of a variety of industries. Some of the typical industrial parts produced include:
- For aircraft: e.g., aircraft loading systems, cast rings, compressors, flanges, propeller hubs, and shaft sleeves and liners
- For automobiles: e.g., bearing bushings, cylindrical liners, gear blanks, piston rings, and transmission systems
- For electronics: e.g., switchgear components
- For petroleum processing plants: e.g., ethylene coils, elbows and fittings, furnace tubes, pump and valve housings, and tube trees .
- For power plants: e.g., steam turbine bearing shells and turbine heat exchangers
Centrifugal Casting Solutions From Accurate Specialties
At Accurate Specialties, we use centrifugal casting—along with other casting methods—to produce high-quality bronze gear blanks. We accommodate requests for parts made from standard 907 bronze and other bronze alloys in sizes ranging from two to 60 inches in diameter and up to 5,000 pounds in weight. Whether you need one piece or thousands of pieces, we can deliver bronze castings that meet your exact needs.
Some of the industries we serve with our gear blanks include:
- Machine tools
- Power transmissions