What are the characteristics of large casting manufacturers?

What are the characteristics of the casting materials of large casting manufacturers: the size of the castings of the machine tool body is large, up to several meters in length; the quality can reach more than 10t, and the wall thickness is 15~30mm. The requirements are: good precision stability and shock absorption, high modulus of elasticity, suitable compressive strength, moderate hardness and excellent wear resistance; good casting properties required in the process, high It is resistant to deformation and easy to cut, and requires lower production costs, such as melting in a cupola, using a smaller amount of alloying elements. To meet the above requirements, the microstructure should be a pearlite structure, plus a type A graphite with a length less than 250 tim and a uniform distribution, and a certain amount of binary phosphorus eutectic is also required.
Large casting manufacturers prefer sand casting. According to statistics, 60-70% of the castings are produced in sand, and about 70% of them are produced in clay sand. The main reason is that sand casting has lower cost, simple production process and shorter production cycle than other casting methods. Therefore, the engine cylinder block, cylinder head, crankshaft and other castings like the automobile are produced by the clay wet sand process. When the wet type does not meet the requirements, consider using a clay sand table dry sand type, dry sand type or other sand type.

Castings from large foundry clay wet sand castings can range from a few kilograms up to tens of kilograms, while clay dry castings can weigh up to several tens of tons. Generally speaking, for medium and large castings, cast iron parts can be made of resin self-hardening sand type, and steel castings can be produced with water glass sand type, and castings with precise dimensions and smooth surface can be obtained, but the cost is high. Of course, casting precision, surface finish, material density, metallographic structure, and mechanical properties of sand casting are often poor. Therefore, when these performance requirements of castings are higher, other casting methods should be used, such as investment casting. Wax) casting, Die casting, low pressure casting, etc.

DESHENGRUI Machinery is a professional CNC manufacturing and Sheet metal fabrication company, including CNC machining services, CNC Turning service, CNC milling services, CNC drilling services, laser cutting services, stamping services, Die casting service, iron casting service and Steel Forging service.

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