Research on High Precision Dynamic Cutting Force Self-perception Intelligent Tool

doi:10.3901/JME.2019.21.178

Abstract

Abstract: Cutting condition monitoring is an essential function for high-grade CNC machine tools in intelligent machining, meanwhile the cutting force is a direct and effective method for cutting condition monitoring. At present, commercial cutting force dynamometers doesn't meet the demands of industrial application effectively as a result of their large volume, high price as well as poor compatibility. In order to accurately measure dynamic cutting force in machining process, an intelligent tool with cutting force self-perception function is presented. The cutter bar is used as an elastic sensitive element and the semiconductor strain gauge is used as signal conversion element. On the basis of theoretical calculation and finite element simulation, the optimal stress area for packaging the semiconductor strain gauges is determined, and the sensor measurement circuit is designed. The newly developed intelligent tool is characterized with more compact structure, better compatibility, higher precision and even better dynamic performance. Experimental results show that the intelligent tool's static accuracy error in the F_c direction is 1.799%, the lateral cross-interference is 2.610%; and its static accuracy error in the F_f direction is 1.628%, the lateral cross-interference is 0.694%. With a natural frequency of 1 778.98 Hz, the tool can be used for dynamic cutting force measurement in the high-speed cutting process when spindle speed does not exceed 26 685 r/min.

Key words: cutting condition monitoring, cutting force measurement, intelligent tool, high precision, compatibility

CLC Number:

TG501

ZHAO You, GE Xiaohui, ZHAO Yulong. Research on High Precision Dynamic Cutting Force Self-perception Intelligent Tool[J]. Journal of Mechanical Engineering, 2019, 55(21): 178-185.

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