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quality factors of cast iron manhole cover

2023-03-27

The first is the design process of cast iron manhole cover. When designing, in addition to the working conditions and metal material properties to determine the cast iron manhole cover geometry, size, but also from the casting alloy and casting process characteristics of the point of view to consider the rationality of the design, that is, the obvious size effect and solidification, shrinkage, stress and other issues, in order to avoid or reduce the cast iron manhole cover composition segregation, deformation, cracking and other defects.

The second is to have a reasonable casting process. That is, according to the structure, weight and size of cast iron manhole cover, casting alloy characteristics and production conditions, select the appropriate parting surface and modeling, core making method, reasonable setting of casting ribs, cold iron, riser and gating system, etc. To ensure access to high-quality cast iron manhole covers.

The third is the quality of raw materials used in casting. Ductile iron manhole covers are used as shaft parts, such as crankshaft and connecting rod of diesel engine, which require high strength and good toughness. The cast iron manhole covers are quenched and tempered.

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