Copper terminal product material for copper, the yield strength is low, the plastic parts, and for the rotational symmetry shape, suitable for the cold extrusion forming. Fitting cold extrusion is divided into core rod cold extrusion and cold extrusion without mandrel twoA mandrel can limit forming after the pipe diameter, mould is complicated in structure, main used for pipe wall thickness unchanged or minus thin workpiece; Without mandrel forming process has not only axial elongation, and wall thickness will thickening, be applicable to the inside diameter and wall thickness size no strict requirements of the pipe production. No core cold extrusion die no core shaft, the structure is simple, easy to make, easy operation, high production efficiency, a extrusion can get great reduction in area rate, and to minimize the number of deformation. According to the parts inside wall thickness size no strict requirements of the characteristics, the final choice of the project without mandrel cold extrusion process.