Extrusion processing is one of the inner hole finishing methods. It uses a pressing tool whose tool diameter is slightly larger than the diameter to be processed and has a higher hardness, forcibly passing through the pre-machined hole to plastically deform the metal of the surface layer of the hole wall. The method of achieving the required dimensional accuracy of the workpiece is shown in Figure 1. In addition to the characteristics of high work efficiency, process stability, precision and surface roughness (usually up to IT7~IT6 accuracy and R_00.8~R_00.2), extrusion processing can also be corrected to a certain extent. Hole shape, changing the pore size and strengthening the surface.
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