Ring-rolling processing of ring forgings is to use ring rolling machines (also known as ring rolling machines, ring rolling mills, and hole reamers) to produce continuous local plastic deformation of the rings, thereby realizing the reduction of wall thickness, expansion of diameter, and plastic processing of cross-sectional profile forming. craft. The stress-strain and deformation flow during rolling and 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 the ring blank. When rolling and expanding holes, the reduction amount is generally small, so it has the characteristics of surface deformation. Ring rolling is a continuous local plastic forming process, which is the intersection and combination of rolling technology and mechanical manufacturing technology. Compared with traditional free forging process, die forging process, etc., it has significant technical and economic characteristics.
The reaming of the ring forgings during free forging mainly adopts the reaming of the horse bar. The stress and strain of the reaming hole of the horse bar 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 circumferential direction, which is local loading and overall stress. The metal flows in the tangential and width directions in the deformation zone when the horse bar is reamed. When the horse bar is reamed, the metal in the deformation zone mainly flows along the tangential direction, and the inner and outer diameters are increased. The forgings with reamed holes on the horse bars generally have thin walls, so the resistance to the tangential flow of the metal in the outer deformation zone is far smaller in the width direction. Therefore, the dimensional change of the forging during the reaming of the horse bar 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 rings, it is more suitable for forging rings to choose the reaming hole on the horse bar.
