The Study Of Inertia Matching And Development Of Motor Selection Software For Heavy Machine Tool Servo Feed System

Heavy Machine Tool has some inherent characteristics:larger cutting loads and inertia loads when working; large workspace which may cause serious partial load; long process reliability and high security requirements. It is because of these causes, the feed needed of heavy machine tool is at lower speed, but on the other hand, low speed may lead to creeping phenomenon, high capacity servo drive and drive system has become the key part of the heavy machine motion control and drive, where inertia matching aspect is an important factor to guarantee the servo drive and drag effective. However, when selecting motor in the design of the heavy machine tools, the study of inertia matching is lacked, thus, the selection is not always the best, so it is necessary to carry out the motor type selection of heavy machine tool research work accordingly.In view of two typical servo feed mechanism of the heavy machine tool, gives the mathematical modeling process. According to the basic principle of servo system, gives the debugging method of servo feed system, establish the ball screw and gear rack servo feed system mathematical model which can be used for the simulation, optimize the control parameters after debugging, improve the dynamic performance of the system.In order to analyze servo inertia matching degree under different working conditions, put forward the time evaluation index and the dynamic precision index of servo feed system. After verifying the gear and rack servo feed system model, use different conditions, like different inertia ratios, different accelerations and different cutting forces to analyze the inertia matching simulation of the gear rack double motor feed system, recommend the suitable inertia ratio.To establish the virtual prototype model of the cross-slide instead of mathematics transfer function, use the mechanical and electronic combined simulating means to analyze the inertia matching problem under different working conditions. Use soft hybrid model to analyze by segmenting the ball screw; use LMS experimental modal method to verify the correctness of the model. On the ball screw joint simulation platform, analyze the different inertia ratios, different accelerations and velocities effect of dynamic performance, get the recommended servo inertia than value under different working conditions.Finally, develop a software to select the motor of heavy machine tool. The software can carry out the combination of the mechanical transmission chain of feed system, simulate different working conditions, realize the primary and final motor’s selection, analyze the servo feed system’s matching degree, regulate engineering and technical personnel’s motor selection steps, give the evaluation result of the servo motor selection accordingly. Through several relevant example verification in the help of Wuhan Heavy Duty Machine Tool Group Corporation and other companies, the software has received recognition form related engineers.