Oversized Bronze Bearing Casting Methods
Casting MethodsCasting methods utilized for oversized bronze bearings depend on a number of factors relating to the finished component. These include size, shape, and required physical and mechanical properties. The 2 most common methods are centrifugal casting and sand casting.
Centrifugal Casting
The centrifugal casting process is typically used to cast cylindrical shaped castings. Centrifugal casting involves a cylindrical shaped mold. This mold is then rotated or spun about its axis at a predetermined speed. The castings wall thickness is controlled by the amount of material added during the pouring stage. Due to the nature of the centrifugal casting process the inner diameter of the part must always be round in shape. Most impurities in the metal generally have a lower density than the metal itself. During the casting process these impurities will collect in the inner diameter of the casting and can be removed during the casting process. This yields a casting with fewer impurities.
Sand Casting
This process involves making a pattern in the shape of the desired part. The pattern is then placed in a box called a flask and packed with sand. A binding agent is added to the sand to help harden it. The mold is cured and the pattern is removed. The remaining hollow shaped area is where the molten bronze is poured in order to form into the desired shape. After the metal cools, the sand mold is removed and you are left with the sand casting. This casting can be sold as is, or additional finishing processes can follow.