After extrusion, the particle structure of the metal material becomes smaller and more dense. The metal flow line is not cut but distributed continuously along the profile of extruded pieces. At the same time, the cold extrusion utilizes the characteristics of the metallic material produced by cold working, so that the strength of the cold extrusion parts is greatly improved, and the replacement of the high tensile steel to the low tensile steel is possible. In addition, cold extrusion depends on the strong pressure to iron the blank surface, so the dimensional accuracy of cold extrusion parts is high and the surface roughness is low.<br>
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