1. Being squeezed. When pressed, the flow direction of the metal coincides with the direction of the convex transverse movement. The positive extrusion is divided into two types: the solid part is being squeezed and the hollow part is being pressed. The positive extrusion process can produce solid and hollow parts of various shapes, such as screws, mandrels, tubes and cartridges.
2. Back extrusion. When squeezed, the flow direction of the gold shavings is opposite to the moving direction of the punch. The back-extrusion method can manufacture cup-shaped parts of various cross-section shapes, such as a meter cover and a universal joint bearing sleeve.
3. Composite extrusion. When squeezed, part of the metal flows in the same direction as the punch, while the other part of the gold flow direction is opposite to the direction of the punch. The composite extrusion method can produce double cup parts or cups. Parts and pole parts.