Titanium surface after extrusion tap acidification, better performance and cutting, high-speed operation suitable for the effective long. Tapping will not produce the chip, because there is no chip for blind hole thread processing chip and save processing time; 2) there is no chip slot, tap off the larger, so the endurance, torque strength, longer tap life , there is no interference with it is not easy cutting impairment; 3) internal thread made of machined surface for the pressure surface appearance beautiful, smooth, continuous fiber materials, not cut, thread strength increase of about 30% accuracy and stability; 4) female threaded plastic flow forming good surface roughness, the deviation by less effective. 5) to the plastic processing methods, as the parent thread processing tools for good ductility of the material scope of application: aluminum, copper, zinc, brass, carbon steel, stainless steel and non-ferrous metal tapping operations.