Hole enlargement is a plastic processing technology that uses a hole enlargement machine to produce continuous local plastic deformation of the ring, thereby reducing wall thickness, expanding diameter, and forming cross-sectional profiles. The process of reaming is the accumulation of continuous small deformations under local pressure, and the contact area between the workpiece and the mold is small, so the required deformation force is small and the equipment tonnage is small. Expanding holes is similar to static pressure rolling, with almost no impact or vibration, low noise, easy operation, high degree of mechanization and automation, and significantly reduced labor intensity for workers.
