At the end of the forging, the isoaxed polygon substructure remains unchanged, and the stress and metal substructure are continuously transformed, corresponding to the rising part of the deformation diagram. In the next stage of thermal deformation, the stress and the resulting polygon structure do not change.
If you want to reaming on the forging parts, there are still more methods, such as punch reaming, mandrel reaming and split seam reaming. Punch reaming is to punch a hole with a small punch on the blank, and then use a larger punch to pass through it, which can expand the hole and gradually expand the hole to the required size. It is mostly used for the reaming with the aperture within 300mm.
The mandrel reaming is mainly used in the forging process of ring die forging. It is necessary to insert the mandrel into the blank that has been punched through the hole and support it on the horse frame. In the forging process, the blank is fed while being hammered and rotated, so that the blank is repeatedly forged and extended along the circumference between the mandrel and the upper anvil until the inner diameter reaches the required size.
The splitting seam reaming of forging parts is to first rush out two small holes in the blank, cut the metal between the two holes, expand the incision with the punch and then reaming the hole, in order to achieve the required size of forging parts. This method is used for forging thin-wall forgings with large apertures or forgings with holes whose shape is irregular.