In the fastener forming process, cold heading (extrusion) technology is the main processing technology. Cold heading (extrusion) belongs to the category of metal pressure processing. In production, at normal temperature, an external force is applied to the metal to form the metal in a predetermined mold. This method is usually called cold heading.
In fact, the forming of any fastener can not only be realized by cold heading but is also accompanied by forward and reverse extrusion, compound extrusion, punching, and cutting in the process of cold heading, in addition to the upsetting deformation. , rolling and other deformation methods.
Therefore, the name of cold heading in production is just a habitual name, more precisely, it should be called cold heading (extrusion).
The cold heading (extrusion) method for processing fasteners and special-shaped parts is a processing method with high comprehensive economic benefits. Development of advanced processing methods.
Therefore, how to make full use of and improve the plasticity of metal, master the mechanism of metal plastic deformation, and develop a scientific and reasonable cold heading (extrusion) processing technology for fasteners is the purpose and purpose of this paper.
