Exploring the centrifugal casting process: principles, applications and technological innovations
Date: 2024-11-29 Categories: Blog Views: 120
What is centrifugal casting?
Definition: Centrifugal casting is the pouring of liquid metal into the rotary casting (usually 250-1500r/min), and the metal is completed under the action of centrifugal force
Filling and solidification of liquid is a casting method.
• Centrifugal casting must be done on special equipment - centrifugal casting machine (rotary casting machine). Centrifugal casting machine can be divided into horizontal centrifugal casting machine and vertical centrifugal casting machine.
Vertical centrifugal casting
Horizontal centrifugal casting
Classification methods for the application of different centrifugal casting methods
Vertical centrifugal casting
It is mainly used for the production of circular castings with a height less than the diameter, and sometimes special-shaped castings can be poured with this centrifugal casting machine.Due to the stable installation of the vertical casting machine, not only metal molds can be used, but also non-metal molds such as sand molds and investment shells can be used.
Horizontal centrifugal casting
Mainly used for the production of sleeve and tube castings with length greater than diameter.
Characteristics of centrifugal casting
Because the liquid metal is filled, formed and solidified under the action of rotation and centrifugal force, centrifugal casting has the following characteristics:
(1) The liquid metal in the casting can form a free surface of a hollow cylinder, forming a hollow sleeve and tube casting, without the need for a core, thus simplifying the production process of pipes and tube castings.
(2) Centrifugal force can significantly increase the filling capacity of the liquid metal and improve the filling conditions, which can be used for pouring alloys with poor fluidity and thin-walled castings.
(3) It is conducive to the elimination of gases and inclusions in the liquid metal in the casting, and to improve the shrinkage conditions of the casting solidification. Therefore, the casting organization is dense, shrinkage, fewer inclusions defects, good mechanical properties.
(4) The riser system can be reduced or even eliminated, reducing metal consumption.
(5) Susceptible to heavy segregation for certain alloys (e.g. lead bronze, etc.).
(6) The inner surface of the casting is rough, generating oxides and slag, and the size of the bore is difficult to control accurately.
(7) Narrow application surface, only for pipe, tube, sleeve, roller, wheel and other castings with simple shape and rotating axis. Can also produce some simple small shaped castings.
(8) Bimetallic casting can be realized.
Application centrifugal casting
Centrifugal casting is mainly used for the production of iron pipe, copper bushings, cylinder bushings, bimetallic steel backed copper bushings, heat-resistant steel rollers, seamless steel pipe blanks, paper machine dry rolls and other pipe castings, but also for the production of pump wheels, motor rotors and other wheel castings.
