Centrifugal casting pipe is also called centrifugal casting steel pipe, especially suitable for centrifugal casting of heat-resistant steel pipe. Because the centrifugal casting method produces the centrifugal casting pipe, not only the efficiency is high but also the casting pipe organization is dense, therefore, the western country uses the centrifugal casting method to produce.

Sports characteristics

Under the action of centrifugal force, the particle with lower density moves to the center of rotation (internal floating); the particle with higher density moves to the wall (external sinking). Their floating and sinking speeds can be about G times higher than those in general gravity casting, so bubbles and slag particles with lower density can quickly move to the free surface or in the pouring and feeding system in the middle of the mold during centrifugal casting, but the casting is prone to density segregation [2].

solidification characteristics

(1) The solidification sequence is solidification from the outer skin of the cast pipe to the inner skin.

(2) The feeding ability of centrifugal casting is strong, and the centrifugal force of liquid metal is G times larger than the gravity. It has a greater ability to overcome the intergranular feeding channel to fill the intergranular shrinkage.

(3) The liquid metal entering the centrifugal casting mold will slide relatively on the solid-liquid phase mixing area on the crystal front, so that the inclined columnar crystal is obtained on the cross section of the casting. If the sliding is violent, it promotes the formation of equiaxed crystals.

(4) The molten metal entering the cylindrical surface of the mold is filled with the mold layer by layer in the axial direction.

Water-cooled metal centrifugal casting pipe

Water-cooled metal type centrifugal casting pipe is also called Laward centrifugal casting pipe method. Its structural feature is that it uses a long flow groove. When pouring, the pouring groove can be moved or the casting mold can be moved. Due to the special water cooling device, the structure is complex and the cost is high. In addition, due to the chilling effect of water, cast pipes often appear white mouth, need heat treatment, cast pipe production efficiency is high, generally used for mass production of small and medium diameter ductile iron pipe.

Coated metal type centrifugal casting pipe

Coated metal mold centrifugal casting pipe is also called hot mold centrifugal casting pipe, the earliest development and use of this process is the German Dick (Duker) company, its structural characteristics are metal mold without water jacket, the main machine does not move horizontally, the use of short flow groove, spray a layer of paint on the inner surface of the mold, can get no white mouth cast centrifugal tube, this machine has simple structure, low cost, easy to replace the mold, and long life of the mold, cast pipe diameter is not limited, can produce gray iron pipe and ductile iron pipe.

Resin sand lined centrifugal casting pipe

Resin sand lining centrifugal casting pipe process is characterized by hanging a layer of sand lining with resin as binder on the inner surface of the metal mold, thus greatly improving the life of the metal mold, and can obtain no white cast centrifugal tube, especially suitable for large diameter ductile iron pipe production.