Advantages of centrifugal casting of composite pipes
Compared with ordinary centrifugal casting, centrifugal casting of composite pipes developed on the basis of centrifugal casting technology also has the following characteristics:
To save a lot of alloy materials.
The inner and outer layers of the centrifugally cast composite pipes use different materials: for castings such as rolls or roller tables, the outer layer is made of high-alloy material to ensure the performance of the casting, and the inner layer is made of cheap gray cast iron ductile iron and For cast steel, for the components of the cast tube sleeve and the steel sleeve, the material selection is just the opposite, so the centrifugal casting of composites method is used to produce bi-alloy, composite rolls, roller tables, cast tube sleeves, and steel sleeves and other wear-resistant castings, which can save a lot of core materials and reduce the production cost of wear-resistant castings.
- To save processing time and improve production efficiency, for bimetallic composite castings produced by the bimetallic centrifugal composite casting method, only high alloy materials are used for the working layer, and materials such as gray cast iron, ductile iron or cast steel with better machinability are selected for the non-working layer. Therefore, using the dual-alloy centrifugal composite casting method to produce dual-alloy composite wear-resistant castings can save processing time on non-working surfaces and improve production efficiency.
- Improve the mechanical properties of castings, and alloy wear-resistant castings have the characteristics of high hardness and brittleness. After direct centrifugal casting, the castings have low strength and are prone to cracks or even fractures during use. High alloy wear-resistant materials and high-strength cast iron, ductile graphite After the centrifugal casting of composite cast iron or cast steel, the overall mechanical properties of wear-resistant composite castings can be improved to meet the strength requirements of castings and prevent castings from breaking.
- The annealing process can be omitted, saving energy. The steel rolling roll ring needs to have key grooves or drilled threaded holes on the inside before assembly, and it is firmly combined with the mandrel through splines or bolts. Ordinary integral centrifugal casting high alloy roll rings (such as high-speed steel, high-chromium cast iron, etc.) have high hardness and inner holes. It is very difficult to open keyways or drill threaded holes, and usually requires softening and annealing treatment, resulting in long production cycles, high energy consumption, and severe oxidation burnout. The bimetallic composite roll ring is produced by the bimetallic centrifugal composite casting method. The inner layer is made of gray cast iron, ductile iron, or cast steel with good processing performance. Without annealing, the keyway can be directly opened or the threaded hole can be drilled, which can save the softening annealing process. , save energy, and reduce the oxidation burning loss of alloying elements.
