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Compared with conventional tapping mode vibration tapping is a relatively new composite processing method , which can improve the stiffness of process systems , to effectively reduce the tapping torque , to improve the quality of thread processing can be solved , particularly stainless steel , titanium , etc. difficult to machine materials hole tapping problem. Therefore, vibration tapping of difficult to machine materials have important practical significance . First, kinematic analysis showed that the tap , the vibration tapping Taps equivalent torsional stiffness . Based on dynamic fracture mechanics theory , analysis of the the vibration tapping tap cutter cutting zone was pulsed force leading to stress is enlivened , reduce the cutting torque . The the vibration tapping repeated cutting characteristics can reduce the friction torque is conducive to cutting fluid into the cutting zone , reducing the friction torque . Torque comparison test to verify the reasonableness of the Mechanism . Secondly , based on the strong non - linear modeling capabilities of artificial neural network , the establishment of a multi-parameter vibration tapping torque model parameters including performance parameters of process parameters and material mechanics . Vibration tapping M5 test different materials , materials for 45 steel ( normalizing ) , austenitic stainless steel 1Cr18Ni9Ti and titanium alloy of TC4 . The test data, network training , vibration tapping torque model based on BP neural network technology . Finally, the numerical model of the torque created , the structure shows that : the tapping torque decreases with increasing frequency , with the angular amplitude and net cutting time ratio increases , and the net cutting time than tapping the torque impact are the most significant . Of vibration tapping from the thread complete tooth shape , the shape of the rules . Therefore , the vibration tapping can effectively solve the problem of difficult to machine materials holes tapping process .
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