Structural Optimization Design Of Piezoelectric Milling Force-measuring Platform And Experimental Study

With the development of machining quality and production efficiency, cutting processing is developing in the direction of high speed, high accuracy, high automation. Every minimal change of cutting state can be reflected through the change of cutting force, as is shown by lots of research results. The detection of cutting force is one of the monitoring methods which are most researched and applied both at home and abroad at present. Grinding dynamometer is the basic instrument and method to research grinding process, which can recognize fault then isolate its origin and improve reliability and production efficiency of the workpiece process. It is an absolutely necessary link to realize condition monitoring, adaptive control, optimal control in automatic cutting at present. So developing grinding dynamometer with high performance has very important meaning.Three-direction rigidity mutual matching of elastic rings and sensors is the core of structure optimal design of piezoelectric grinding dynamometer. This paper, starting from the core of optimal design and based on mechanics analysis, made equal rigidity analysis and calculation of the key dimension of tri-direction-force transducer's structure, and accurately found optimal boundary conditions of elastic ring structure. Three dimensional existence parametric model of the force-measuring platform is built by using finite element method. Structure optimization of the force-measuring platform is achieved by using ANSYS finite element optimization module and optimal structural parameter is achieved.Verified by dynamic calibration, static calibration and cutting experiments, the technical index of the force-measuring platform completely reached dynamic dynamometer standard stipulated by CIRP-STC. It can provide theory basis and guidance for the design, manufacture and experiment research of the piezoelectric grinding dynamometer.This paper mainly realized equal rigidity design of grinding force-measuring platform, effectively improved sensitivity of sensors. Through dynamic and static calibration of the sensors, we draw a conclusion that the optimized sensors have good linear static characterisics,obvious reduce of linearity and multiplicity and obvious increase of natural frequency.