During cold drawing, the steel pipe undergoes plastic deformation through a mold of a certain shape and size under the force of force. At present, the drawing methods in production can be roughly divided into three types: reduced-diameter extubation, reduced outer wall extubation and reduced inner wall extubation. During cold drawing, the steel pipe occurs under the action of drawing force, positive pressure and friction The corresponding deformation mostly passes through the three stages of diameter reduction, wall reduction and sizing, and the corresponding stress is generated inside the deformation zone, in which the axial stress is tensile stress and the radial and circumferential stress is compressive. Tensile and bi-directional compressive stress states are the basic mechanical characteristics of the cold-drawn tube deformation process. Therefore, through the cold drawing process, the internal dislocation density of the metal is increased, and the dislocation mobility is reduced. It is difficult to generate dislocations and move dislocations, so the hardness and strength of the metal material are improved. This is the metallurgical principle of cold drawing.
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