Vibratory tapping is a special internal thread production process, that is, the machining process of applying the appropriate vibration frequency to the tap, which has been studied a lot and achieved satisfactory results. In its reciprocating vibratory tapping process, the separation and contact between the cutting tool and the workpiece are periodic, and with the continuous change of the direction of the spiral, the magnitude and direction of the movement speed are also constantly changing.
In vibratory tapping, high-frequency or low-frequency vibrations are applied to the tap, which converts continuous cutting into intermittent, instantaneous or repetitive pulse cutting. On the basis of the traditional tapping motion, periodic vibrations are superimposed along the helix angle direction of the helix, so that the cutting process transformed by the previous tapping process has the characteristics of pulse, instantaneous and repeated. When the tap rotates at a certain angular velocity, its axial direction has a reciprocating motion and satisfies a specific vibration frequency and amplitude, so as to form a special pulse cutting process, and repeatedly cut the machined surface to improve the cutting performance of the machined material, and also improve the lubrication condition.
According to sufficient research, vibrating tapping makes up for the defects and deficiencies of continuous tapping, and has many outstanding process characteristics: Compared with the traditional process, the tapping torque is significantly reduced; Chips can be discharged smoothly; Lower cutting temperature; It has good internal thread quality (high precision); Extend the service life of taps; Improved lubrication conditions and chip breaking. Therefore, vibratory tapping technology will play an irreplaceable role in the machining of deep threaded holes and small diameter threaded holes on materials with hard texture and high elongation. Using vibrating tapping technology for processing and production, the tap wear is small and generally will not break. However, there are still some problems that need to be solved: the tap cutting feed is driven by periodic vibrations, and the transfer energy is limited and the efficiency is not high. The feed movement of the taps requires special equipment to drive, so it is difficult to achieve high-quality and high-efficiency processing by vibrating tapping.