The forging process of the ring forging mainly consists of the following steps: thick, long, punched, and reamed. The difference between the free forging and the annulus process is mainly in the process of reaming. The use of free forging in the production of ring forgings is usually a reaming of the horse bar, and the boring ring is mainly used for boring and reaming.
The annular forging is processed by the boring ring by means of a boring ring machine (also known as a ring rolling machine, a ring rolling mill, a reaming machine) to produce continuous local plastic deformation of the ring member, thereby realizing plastic processing with reduced wall thickness, enlarged diameter and profiled profile. Process. The stress strain and deformation flow during rolling reaming are the same as the mandrel reaming. It is characterized in that the tool is rotated and the deformation is continuous, that is, the rolling of the annular blank. When the pressure is expanded, the amount of reduction is generally small, so it has the characteristics of surface deformation. The ring is a continuous local plastic forming process, which is the intersection and combination of rolling technology and mechanical manufacturing technology. Compared with the traditional free forging process, die forging process, etc., it has remarkable technical and economic characteristics.
The annular forging is mainly used for reaming in the free forging. The stress-strain condition of the reaming of the horse bar is approximately lengthened, which is different from the long shaft lengthening. It is the lengthening of the ring forging blank in the circumferential direction, which is partial loading and overall force. When the horse bar is reamed, the metal in the deformation zone flows in the tangential and width directions. When the horse bar is reamed, the metal in the deformation zone mainly flows in the tangential direction and increases the inner and outer diameters. The forgings on the horse bar are generally thinner, so the resistance of the tangential flow of the metal in the outer deformation zone is far smaller than the width direction, and the contact surface of the horse bar and the ring forging is curved, which is favorable for the metal to flow in a tangential direction. Therefore, the size change of the forging piece when the horse bar is reamed is that the wall thickness is reduced, the inner and outer diameters are enlarged, and the width (height) direction is slightly increased. Therefore, in small batches and small ring parts, the use of reaming on the horse bar is more suitable for forging ring forgings.