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Flange forging
Deformation temperature
The initial recrystallization temperature of steel is about 727℃, but 800℃ is generally used as the dividing line.Between 300 ℃ and 800℃ is called warm forging or semi-hot forging.
Blank
According to the moving mode of billet, forging can be divided into free forging, upsetting, extrusion, die forging, closed die forging and closed upset forging.
1. Free forging.There are two kinds of forgings: manual forging and mechanical forging.
2. Die forging.Die forging is also divided into open die forging and closed die forging.The forging of metal billet is obtained by pressing and deforming in a certain shape of die bore, which can be divided into cold heading, roll forging, radial forging and extrusion, etc.
3. Closed die forging and closed upset forging have high material utilization due to the absence of flaps.It is possible to finish complex forgings with one or more processes.With no flaps, the forgings have less stressed area and require less load.However, it should be noted that the blank should not be completely restricted, so the volume of the blank should be strictly controlled, the relative position of forging die should be controlled and the forging should be measured to reduce the wear of forging die.