时间：2015-10-09 18:28　作者：admin　点击： 次

Metal can improve its structure and mechanical properties after forging.After the casting structure is deformed by the forging method due to the deformation and recrystallization of the metal, the original coarse dendrites and columnar grains become the equiaxed recrystallized structure with finer grains and uniform size, which makes the original segregation in the steel ingot, The compaction and welding of looseness, pores, slag inclusions, etc., make the structure more compact and improve the plasticity and mechanical properties of the metal.
    Because the density of forgings is better than that of castings.Forgings are formed by repeated rolling of cast blanks, with high structure density, shrinkage cavities and porosity are compacted; columnar dendrites are broken, eliminating the isotropy of mechanical properties.
    Casting is a product formed after molten metal is poured into the model and solidified. The structure is coarse and there is shrinkage porosity inside, so the mechanical properties of the casting are better than the casting.
    The characteristic of castings is that it is easy to obtain workpieces with complex shapes that are not easy to obtain by other methods; the cost of castings is low, and precision castings can be obtained by special technology. Defects and non-dense areas are prone to appear inside, and domestic technology generally cannot guarantee the quality of forgings in strong corrosion and high pressure situations.
    Castings use forging equipment to forge bars. Generally, complex workpieces cannot be forged and require a large amount of processing. However, forgings have a dense structure and are not prone to internal defects. Therefore, they are widely used in demanding requirements. Parts processing.