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What Is The Casting Casting Feature?
Jun 27, 2017

What is the Casting Casting feature?
  Casting Casting characteristics are: Casting mechanical properties than cast iron, but its Casting performance is worse than cast iron. Because the melting point of cast steel is higher, the molten steel is easy to oxidize, the molten steel is poor in fluidity, shrinkage is large, its body shrinkage is 10 ~ 14%, line shrinkage is 1.8 ~ 2.5%. In order to prevent the Casting from pouring, cold separation, shrinkage and shrinkage, cracks and sticky sand and other defects, must take more complex than the cast iron process measures:
    1, due to the poor fluidity of molten steel, in order to prevent cold and pouring Castings and pouring, Casting wall thickness can not be less than 8mm; Casting system structure is simple, and cross-sectional size than cast iron; ; Appropriate to improve the pouring temperature, generally 1520 ° ~ 1600 ℃, because the pouring temperature is high, the superheat of molten steel, to maintain a long liquid, liquidity can be improved. But the pouring temperature is too high, will cause coarse grain, hot cracking, pores and sticky sand and other defects. So the general small, thin-walled and complex shape of the Casting, the pouring temperature is about the melting point of steel temperature + 150 ℃; large, thick Castings Casting temperature higher than its melting point of about 100 ℃.
    2, due to the Casting shrinkage much more than cast iron, in order to prevent Castings shrinkage, shrinkage defects, in the Casting process mostly use riser, cold iron and subsidies and other measures to achieve the order of solidification. In addition, in order to prevent the Castings from shrinkage, shrinkage, pores and cracks, should make the wall thickness uniformity, to avoid sharp and right angle structure, in the molding sand with sawdust, coke in the core, and the use of hollow Core and oil core, etc. to improve the sand or core of the concession and permeability.
  One of the advantages of Casting is the flexibility of the design. Designers have the greatest freedom of design and shape for the shape and size of the Castings, especially in the form of complex and hollow sections, which can be manufactured using a unique process. Its shape and shape change is very easy, from the drawings to the finished product conversion speed is very fast, is conducive to rapid quotation response and shorten the delivery time. Shape and quality of the perfect design (state of the art), the smallest stress concentration factor and the overall structure of the strongest and other characteristics, are embodied in Casting design flexibility and process advantages:
    1) Casting metallurgical manufacturing adaptability and variability, you can choose a different chemical composition and organization control, adapted to a variety of different engineering requirements; through different heat treatment process in a larger range of mechanical properties and performance, And has good welding performance and processing performance.
    2) The isotropic nature of the cast steel and the overall structural strength of the Castings, thus improving the engineering reliability. Coupled with the weight reduction of the design and short delivery time, in terms of price and economy has a competitive advantage.
    3) The weight of the Casting can vary widely. The weight of small can be only a few dozen grams of precision Casting Casting, and the weight of large Castings up to several tons, tens of tons or even hundreds of tons.