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  • What Is The Forging Classification ?
    Aug 10, 2018

    In the common Machining process, there are CNC Machining, CNC turning, Auto lathe turning,CNC Milling, Stamping, Sheet metal fabrication, Casting, Injection molding etc

    Forging is classified according to forming mode and deformation temperature. Forging can be divided into forging and stamping according to forming mode, hot forging, cold forging, warm forging and isothermal forging according to deformation temperature. 

    Hot forging is a forging made above the recrystallization temperature of a metal. Increasing the temperature can improve the plasticity of the metal and improve the internal quality of the workpiece and make it difficult to crack. High temperature can also reduce metal deformation resistance, reduce the tonnage of the required forging machinery. But the hot forging process is many, the workpiece precision is poor, the surface is not smooth, the forgings are easy to be oxidized, decarbonized and burned. 

    Cold forging is a kind of forging under the recrystallization temperature of metal. Usually, the cold forging means the forging at room temperature, which is called warm forging when it is higher than normal temperature, but not more than recrystallization temperature. The precision of warm forging is high, the surface is brighter and the deformation resistance is not big. The workpiece formed by cold forging under normal temperature has high precision of shape and dimension, smooth surface, less working procedure, and is convenient for automatic production. Many cold-forging, cold-stamping parts can be used directly as parts or products without the need for cutting. However, due to the low plasticity of metal and the high resistance to deformation, heavy tonnage forging machinery is needed. 

    Isothermal forging is a constant temperature of the blank during the whole forming process. Isothermal forging is to make full use of the high plasticity of some metals at equal temperature, or to obtain specific microstructure and properties. Isothermal forging needs to keep the die and blank together at constant temperature and the cost is high. It is only used in special forging process such as superplastic forming.