Differences between cast pulley and forged pulley

Differences between forged pulley and cast pulley

According to the manufacturing process, it can be divided into forging pulley, welding pulley, casting pulley, rolling pulley and double plate pressing pulley

Forged pulley:

It is a processing method that uses forging machinery to exert pressure on pulley metal blank to make it plastic deformation to obtain forgings with properties, shape and size. It is one of the two major components of forging (forging and stamping). The microstructure is optimized by forging energy metal defects such as casting porosity during smelting. At the same time, due to the preservation of complete metal streamline, the mechanical properties of forgings are generally the same as those of castings made of the same material. For the important piece with high load and severe working conditions in the relevant machinery, except for the rolled plate, profile or welding piece with simple shape, forgings are mostly used.

Compared with the cast pulley, the forged pulley has its organizational structure and mechanical properties after forging. The pulley after hot working and forging deformation crystallizes the raw materials, turns the original crystal and columnar grain into a crystalline structure with finer grains and uniform size, which makes the structure inside the pulley more compact. The physical use properties of the pulley are improved. The appearance and roughness of the processed pulley forgings are more beautiful, smooth, and smooth than the cast pulley, Because the process cost accounting is more expensive than the casting pulley. However, pulley forgings are often selected for important high quality, large cranes or other models.

Cast pulley:

Casting pulley is a process of smelting metal into metal liquid that meets the requirements and pouring it into the casting mold, and obtaining the predetermined shape, size and performance of pulley after cooling, solidification and cleaning treatment. Because casting pulley blanks are nearly formed, the purpose of no machining or a small amount of machining is achieved, which reduces the cost and production time. Pulley casting is the basic process of modern device manufacturing industry.

Compared with forged pulleys, it has the advantages of being able to produce pulleys with complex shapes, which are rough pulleys with complex cavities; Wide adaptability and low cost; The raw materials come from a wide range of sources and are cheap. The shape and size of the pulley castings are close to the parts, reducing the cutting amount, so it belongs to non cutting processing. The disadvantages are mechanical properties of pulley forgings, such as structure, many defects, etc; In sand casting, single piece and small batch production make workers labor intensive; The pulley casting has unstable quality, many processes, complex influencing factors and many defects.

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