| Compared with the traditional method of tapping, vibration tapping is a new method of compound manufacturing. It has the advantages of enhancing the torsional rigidity of manufacture system, a much lower tapping torque, much better quality of screw thread. Vibration tapping is then proved to be a practical solution to the problem of small-hole tapping in difficult-to-cut materials. Now researching on the mechanism of vibration tapping and designing a much better system has a great practical significance.Through analyses of moving, the vibration tapping can enhance the torsional rigidity of manufacture system, and having a much lower friction torque. Through analyses of elasticity and plastic, it proofs that the impulse cutting can crack the metal, the crack will result in fall of tapping torque. The impulse cutting also let the lube be easy to get in the section of cutting, it help to low the friction torque.By using simple-factor experiment and Orthogonal Experiment the author have done a great deal experiment with GH4169 and TC4. In simple-factor experiment, the author used amplitudes, frequency, net cutting time ratio as the parameters, to get the regular pattern of tapping torque as parameter changing. Through Orthogonal Experiment, the author have gained the experience formula. By using different lube to do experiment, the author research on the effect of lube.Lastly, contra-posing with the disadvantage of former system, designed a new system and finished the control program by using the idea of modularization.Through the experiment of vibration tapping, we find the tapping torque augmenting as the frequency diminishing, augmenting as net cutting time ratio augmenting, and it is most influenced by net cutting time ratio. Use of lube is effective to low friction torque. Morphology of teeth of vibration tapping is integrated. All these proof that vibration tapping is a effective method to resolve small hole tapping in difficult-to-cut materials. |
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