With the development of processing technology, in recent years, titanium alloys have been widely used in the manufacture of aircraft engine compressor sections, engine covers, exhaust devices and other structural components such as aircraft frame frames. Titanium tapping, especially tapping of small holes below M6mm is quite difficult. Mainly because the chip is small, it is easy to bond with the blade and the workpiece, resulting in a large surface roughness value and large torque.

    Improper selection and improper operation of the tap during tapping will result in work hardening, low processing efficiency and breakage of the tap. The solution is as follows:

    It is preferred to use a wire jumper in place, the number of teeth should be less than the standard tap, generally 2 to 3 teeth. The cutting cone angle should be large, and the taper portion is generally 3 to 4 thread length. In order to facilitate chip removal, a negative inclination angle can also be ground in the cutting cone portion. Try to use a short tap to increase the rigidity of the tap. The inverted cone portion of the tap should be appropriately enlarged compared to the standard to reduce the friction between the tap and the workpiece.

    Titanium alloy is an ideal material for aircraft and engines because of its high specific strength, good mechanical properties and good corrosion resistance. However, due to its poor machinability, titanium alloy has long restricted its application.