Optimization Of Computer Number Control Machining Feed Rate Based On Cutting Amount

The machining efficiency and machining quality of CNC machine tools are important indicators of inspection processing,and the feed speed module has a direct impact on the machining efficiency and machining quality of the machine tool.The speed planning for the trajectory is based on the trajectory geometry and the theoretical performance index of the machine tool,without considering the actual machining state of the machine tool.In CNC machining,the adaptive speed adjustment maintains the machine performance index by expecting by comparing the machining performance index with the expected performance index.The cost of this method is high,and the existing sensors cannot meet the accuracy and real-time performance of online monitoring.Under the background of large-scale single workpiece repetitive machining,this paper proposes the optimization of CNC machining feed rate based on cutting amount based on the trajectory speed planning.In the case of known cutting parameters,the cutting force is simulated by the cutting force,the machining state is judged based on the cutting force,and the machine feed speed is adjusted.In the ideal state,the cutting force is mainly related to the depth of cut,the feed rate and the spindle speed.Three cutting parameters were extracted through VERICUT secondary development,and the cutting force was simulated by combining cutting parameters with cutting force modeling.According to the segmentation optimization,the processing code trajectory is segmented,the processing state of each segment trajectory after segmentation is judged,the feed speed of the corresponding segment is adjusted,and the adjustment accuracy is verified by the vibration sensor.In the case of unknown cutting parameters,the vibration sensor collects signals to determine the machining state,and the feed rate is adjusted according to the machining state.In the actual machining process,by changing the cutting parameter value,the influence of cutting depth,feed speed and spindle speed on the vibration of the machine tool is judged.The frequency domain analysis of the vibration signal is performed to extract the vibration signal of the frequency domain segment which is greatly affected by the cutting.According to the segmentation optimization,the trajectory is segmented,the vibration signal is corresponding to the trajectory segment,the processing state of each trajectory is judged,and the feed speed is adjusted.The trajectory is thinned out,processed according to the optimized processing code,and the experiment is repeated until the vibration signal is reduced to the threshold to obtain the optimal processing code.