The correction tooth tap is to change the forming thread of the standard tap into a progressive method. When the other conditions are exactly the same, if the back width is reduced (grinded) by 1/2 to 2/3, the tapping torque is reduced by 1/4 to 1/3. Increase the chip space and reduce the number of teeth after leaving 0.2 to 0.3 mm of the knife belt on the calibration tooth, increase the back angle to 20° to 30°, and grind the middle section of the tooth along the full length of the tap After retaining 2 to 3 buckles, increase the back taper from 0.05 to 0.2 mm/100 mm to 0.16 to 0.32 mm/100 mm. The measures for treating common taps are as follows: Must after technical treatment before being tapping titanium alloy screw. Therefore, the key to solving the problem of tapping of titanium alloy is to reduce the contact area between the tap and the workpiece during tapping. In addition, the chip is small and not easy to bend, there is sticky knife phenomenon, resulting in chip removal difficulties. This is because the elastic modulus of titanium alloy is too small, the surface of the thread produces a great rebound, which increases the contact area between the tap and the workpiece, resulting in a great friction torque and worn worse. This difficulty is mainly manifested in the large total torque of tapping, which is about twice that of 45 steel The tap teeth are worn out, chipped, and even "bitten" in the threaded holes and broken. Titanium tapping is the most difficult process in titanium alloy machining, especially for small threads.
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