Types of centrifugal casting
Various types of centrifugal casting process is used when specific parts are needed. This implies that, different type of centrifugal casting is used based on the suitability its offers to the casting. In my previous article, I have examined on What is centrifugal casting? – its Advantages and Disadvantages.
Types used in manufacturing industries are the following:
True centrifugal casting
True centrifugal casting is a casting technique employed when producing part with an axis symmetrical, with a uniform diameter. It contains a cylindrical mold that rotates about its axis at a specific speed.
Molten metal is poured through the center, which is thrown to the wall of the mold. Due to the centrifugal force applied to it. It solidifies and the casting is take out of the mold. Thickness in this type of casting is determine by the amount of poured liquid metal. This type of centrifugal casting has a directional solidification as it cooling start from outside to inside.
Central core is not required just as semi-centrifugal casting. It also has fast production rate, because casting can easily be removed when solidified. This type of casting offers very high quality, sometimes 100%. However, true centrifugal casting required a very investment, and a skilled labor must be employed. True centrifugal casting is used in manufacturing of bearings for machines, pipes, liners for IC engines, rings and other annular casting.
Semi-centrifugal casting is similar to true centrifugal casting, but they have slight difference. It is used in casting items like, wheels, sheaves, blanks etc. semi centrifugal casting is carryout on a vertical mounted machine. Rotating in a vertical or concentric axis, at a low spinning speed. Speed range between 180 to 200 rpm. Gate way is needed to have a directional solidification. In this type of centrifugal casting, more than one items can be produce at a time. Due to the stacking to multiple numbers of mold.
Centrifuge casting is another type of casting method used in casting unsymmetrical castings in group. It is carryout in group in order to produce equal part in the whole casting. rotation axis of the mold doesn’t coincide with each other in centrifuge casting. It helps to induce pressure in the mold as casting rotates at the center. Molten metal is feed to mold cavities by centrifugal forces. Centrifuge casting offers better quality, produces large rate in less time, economical as the cost of cleaning and fettling is reduce.
Working principle of centrifugal casting
Working principle of centrifugal casting is carryout by pouring molten metal into a spinning mold, pre-heated to some certain temperature. Mold type can either be vertical or horizontal depending on the type of item to be produced. The mold rotates at certain speed. Controlled by an electric motor, causing the molten metal to rotate about its central axis. At this point, the poured molten metal is thrown to the mold walls. Molten metal spread uniformly to the walls creating cylindrical shape. Nothing like defect in pouring in centrifugal casting. More molten metal is pour till the required size and shape is obtain.
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That is it for this article, types of centrifugal casting and working principle. Answer the question below to assure me you truly understand. Share and comment. Thanks for reading!
Question: in your own understanding explain any of the types of centrifugal casting.