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Rigid tapping in drilling and tapping centers is an electromechanical control system with strong nonlinearity, uncertainty, and difficulty in accurate modeling. It will inevitably be affected by nonlinear and uncertain factors such as friction and mechanical resonance. The traditional motion control algorithm is difficult to fundamentally solve the contradiction between the rapid stability of the system response and the high stability accuracy. The electromagnetic torque is one of the most important physical quantities of the three-phase asynchronous motor, and the mechanical characteristics are the main characteristics of the motor; from these two aspects it is often inseparable to analyze the motor. This paper proposed an algorithm of subsection approximating torque curve acceleration and deceleration and applied this algorithm to the rigid tapping engineering practice of CNC machine tools. The control method did not need to establish the exact mathematical model of the torque characteristics of the motor mechanical characteristics. The method of segment approximation achieves the modeling of the mechanical characteristic torque curve, has satisfied the comprehensive index requirements and technical feasibility of the system for rapidity and smoothness, and finally passed the test of the test platform and verified the actual tapping of the drilling. Keywords—segmented approximation; mechanical characteristics; torque curve; servo spindle rigid tapping

Application of Subsection Approximation Torque Curve Acceleration and Deceleration Motion Control Algorithm in Rigid Tapping of Drilling Center