Centrifugal casting is composed of sand, metal or ceramic mold with rapid baking. When liquid metal is poured into the mold, it contacts the mold wall until it cools and solidifies. This process of Dongguan CNC processing plant is increasingly widely used in the production of these products: cast iron pipes, cylinder liners, gun barrels, pressure vessels, drum brake devices and speed regulating wheels. The metals that can be used include almost all casting alloys. Because of the relatively short cooling time, centrifugal casting has a fine grain size. Now there is a tendency to isolate the light non-metallic inclusions such as slag particles and dregs within the internal radius of the casting, so that they can also be easily removed by machining. Due to the high purity of the outside, the centrifugal casting pipeline has a high atmospheric corrosion resistance.
The principle of centrifugal casting is shown in Figure 11.11. The centrifugal force produced by rotation is greater than the usual centrifugal force, and there are two ways to use it. The first is in the process of casting, centrifugal force is used to separate the liquid metal on the outer surface of the mold. Dongguan CNC processing plant A method for preparing a hollow cylinder or other annular member is provided. The second is the development of high pressure in the process of casting solidification. This, combined with directional solidification, helps to provide and accelerate the separation of nonmetallic inclusions and precipitated gases. Therefore, the advantages of this process are twofold: suitable for casting tubular castings and products with high metal properties.
The casting of simple pipe mold is completed by the mold rotating around its axis. Only centrifugal force can determine its shape, and its wall thickness is determined by the volume of liquid metal introduced. This is commonly referred to as centrifugal casting. In the case of different internal diameter or irregular wall thickness in the center of the module, it may be used to form the internal contour and make up for the shrinkage of solid phase. Further from the original concept is the formation of the axis of rotation
The distance between the molding casting and the central shaft. These changes are involved in semi centrifugal casting, centrifugal casting or pressure casting; In both cases, since the formation of the casting is completely determined by the mold and core, the initial centrifugal force is used to provide pressure.

The axis of rotation can be horizontal, vertical or inclined. Important changes exist in the mold material and the method of introducing molten metal.
The centrifugal force acting on the rotating object is proportional to the square of rotation radius and rotation speed

The gravity acting on the same object is calculated as follows:

Therefore, the orthogonal force of gravity is increased during rotation, which is calculated by the following formula:

In a more convenient speed unit of RPM, the expression becomes:

Although in some cases, more than 200g centrifugal force can be obtained, most of them are at 10g In the range of 150g to 150g, the highest value is used for opening small diameter cylindrical components, and the lowest value is used for semi centrifugal casting and pressure casting. Most of the force of 60g to 80g produced by velocity is used for true centrifugal casting. However, as emphasized earlier, the optimum value of centrifugal force decreases with the increase of diameter. Cumberland cites 33g for common vertical axis castings and 15g for sand molds Because the low speed is enough, there is no need to rely on centrifugal force to form the casting. Thornton gave die casting values of 50-100g and sand casting pots and cast iron values of 25-50g.
When Dongguan CNC processing plant As the metal is cast into the mold, the mold rotates rapidly around its central axis. Because of centrifugal force, A continuous pressure will act on the metal during solidification. Dregs, oxides and other lightweight inclusions will be separated from the metal to the center of rotation. There are three main forms of centrifugal casting process. They are: centrifugal casting, semi centrifugal casting and centrifugal casting.