Improvement of Casting Process for Ductile Iron Castings
4.2MW wind power casting as an important part of our wind turbine,strict control of the internal quality of the casting is the key.The casting process of ductile iron was improved.The outer cold iron is evenly placed on the bottom of the casting,the in-ner ring of the casting and the outer ring of the casting to increase the chilling capacity of the casting mold,reduce the solidification area of the liquid metal,and accelerate the crystallization and solidification cooling speed of the liquid metal.The special pouring cup structure is designed to reduce the contact surface between liquid iron and air,effectively prevent gas and slag from getting involved in the mold cavity,and reduce the impact of liquid flow on the resin sand mold cavity.Control the hardness of sand mold(core)and reduce the self-expansion of graphite.Baking sand mold,cavity moisture,reduce the tendency to form pores.Optimize the melting process to obtain more dense structure of graphite balls.Through the above process measures,the shrinkage and porosity defects of ductile cast iron are effectively prevented,the yield of ductile cast iron is improved,the cost is reduced,and the production task of ring thick-wall castings such as 4.2MW front and back gland is successfully completed.
QT400-18Lwind power castingshrinkage cavity and loose defectsimprove product rateprocess improvement
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