Finish turning large-pitch thread cutting process system stability design method

The invention discloses a finish turning large-pitch thread cutting process system stability design method. The cutting process system vibration is used as the process system stability judging basis,wherein process system comprehensive frequency-response functions are avoided from three subsystem inherent frequencies as the frequency domain measuring standard; the cutter wear quantity meets the workpiece precision requirements as the process system stability time domain measuring standard; the cutter wear quantity is obtained through substituting the cutter vibration displacement in the cutting process into a vibration wear model; the cutter vibration displacement in the cutting process consists of the vibration displacement caused by the cutting force and the cutter vibration displacement under the interaction effect of process subsystems; cutter structure parameters are obtained by cutting simulation and genetic algorithm; cutting parameters are obtained by combining with optimal selection of machining sche