(1) Control the tap rake angle γ0 to improve cutting performance. The rake angle γ0 has a great influence on the cutting process. Increasing the rake angle can make the tap cutting edge sharp, and the plastic deformation and friction resistance during the cutting process can be reduced, so that the cutting process is light and labor-saving. However, if the rake angle is too large, The strength of the cutting edge and the cutter head is weakened, the heat dissipation condition becomes worse, and the tap is easy to wear or chip. Tests have proved that, in view of the characteristics of titanium alloy machining parts and the special process of machining small-diameter internal threads, the rake angle γ0 of the tap is increased to 7o ～ 10o, which ensures the strength of the tap and improves the cutting performance to a large extent. Chips are easy to curl and remove.
(2) Increase the clearance angle a0 'of the calibration part to reduce the friction during the cutting process and improve the self-centering ability. The tap clearance angle a0 is also another physical quantity that affects the cutting process. A larger clearance angle will reduce friction and facilitate the cooling solution to flow into the cutting area, but the clearance angle should not be too large. A too large clearance angle will make the tap close and automatically center. Ability is weakened. For the processing of titanium alloy materials, after testing, while retaining the structure of the original standard tap calibrated tooth top edge, the straight-line method of sharpening is used to add a clearance angle of a0 ＇= 6° to 12°. It can reduce the contact area between the tooth tip and flank surface and the machined thread surface, and can increase the self-centering ability. From the above analysis, it can be seen that in the processing of titanium alloy small-diameter internal threads, reasonable sharpening of all angles of the tap can not only ensure the processing quality but also increase the service life of the tap. In the process of supplying small-diameter internal threads for titanium alloy workpieces, attention should also be paid: the tool needs to have a relatively large inverted cone to make the cutting cone from front to back to reduce the friction caused by the reverse force of the titanium alloy material. At the same time, the chips for tapping small-diameter internal threads of titanium alloy processing parts manufacturers are very thin, and the tool surface behind the tap and the transition is consumed quickly, and large wear will occur, which affects the work of the tap and makes the machining place rough and fine. It may also be destroyed, so this requires attention to the consumption of these places during processing. When 0.3-0.5mm is worn out, the tool should not be used again to avoid problems such as tool breakage, chipping and other problems affecting quality, and avoid excess Loss, to ensure the quality of internal thread processing.