What are the characteristics of forging process for annular blank forgings?
The forging process of ring forging mainly consists of the following processes: pier roughening, elongation, punching and reaming. The difference between free forging and ring rolling is mainly in the process of reaming. In the production of ring forgings, the free forging is usually used to expand the hole with horse bars, and the ring rolling is mainly used to expand the hole with rolling.
Ring rolling is a continuous partial forming process, which is the intersection and combination of rolling and mechanical manufacturing. Compared with the traditional free forging process and die forging process, it has significant and economic characteristics. During free forging, the reaming of ring forgings is mainly done with horse bars. The stress and strain of the horse bar reaming is similar to the elongation, which is different from the elongation of the long axis. It is the elongation of the ring forging blank along the circumference direction, which is local loading and overall stress.
Ring rolling processing for ring forgings is a plastic processing technology that uses ring rolling machines (also called ring rolling machines, ring rolling mills, and reamers) to make rings produce continuous local plastic deformation, thereby reducing the wall thickness, expanding the diameter, and shaping the profile. The stress, strain and deformation flow during rolling reaming are the same as those of mandrel reaming. Its characteristics are: the tool is rotated, and the deformation is continuous, that is, the rolling of annular billets. Generally, the reduction is small when rolling reaming, so it has the characteristics of surface deformation.