The Design And Experimental Study Of Force Measuring Tool Holder System Based On Wireless Transimission

A new general information technology and manufacturing are deeply integrated,which causes far-reaching changes in the industry and improve high-end CNC machine tools toward intelligent development.The development of intelligent machine tool is inseparable from its intelligent functional components.Intelligent function components integrate mainly one or several intelligent sensors,to achieve intelligent features such as force monitoring,vibration monitoring,thermal compensation,wear monitoring,condition monitoring and so on.There are many physical parameters in the cutting monitoring,such as cutting force,cutting temperature,vibration,tool wear and so on.However,the cutting process can be directly reflected by the cutting force in all the physical parameters.Therefore,the monitoring of cutting force has been occupied an extremely important position.At present,measuring cutting force is mostly used desktop dynamometer.The workpiece is installed on the desktop dynamometer in the used process.So the size of the workpiece is limited,and the dynamometer can't meet the real-time monitoring requirements when large parts are required to cutting.For the above situation,this paper developed a kind of measuring tool holder system,which gathers the force sensor and the acquisition and transmission module,and realizes the real-time monitoring of the two-dimensional milling force.The specific research contents are as follows:(1)The mechanical model of the tooling system is established,and the stress distribution of the tool holder cross section is studied.The paper has designed the axial force sensor and the torque sensor based on the stress distribution,and the strain gauge is arranged on the shank reasonably,in order to test the axial force and the torque separately from the effects of bending moment.(2)According to the sensor space layout,the sensitivity of the detection system and the requirements of the tool holder stiffness,the annular groove structure of the tool holder is optimized with the primary optimization goal of the system sensitivity maximum and the secondary optimization goal of axial stiffness and radial stiffness maximum.The mathematical model of objective optimization is established and solved by taking advantage of Goal driven optimization method in order to achieve the structural dimensions of the ring.(3)Based on the structure of the optimized tool holder and circuit module,the overall structure integrated sensor,power module,acquisition and transmission module is designed,and the finite element method is used to verify the rationality(frequency,sensitivity,temperature field distribution)of structure design.(4)The cutting force signal detection system is composed of the acquisition transmission module,the power module and the host computer real-time processing and display module.The two independent acquisition and transmission modules are used to the axial force and torque signal amplification,A/D acquisition,WiFi wireless transmission respectively,and the corresponding hardware and software are designed.(5)The static calibration and cutting test study is carried out in terms of the force measuring tool holder system.