【摘 要】
：
In this study,stress analysis of microdrills was studied by numerical calculation and experimental measurements under loading.The static and dynamic loads act on microdrills analyzing by finite elemen
【机 构】
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Department of Mechanical Engineering, National Taiwan University of Science and Technology,Taipei 10
【出 处】
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The 5th Asian Conference on Mechanics of Functional Material
论文部分内容阅读
In this study,stress analysis of microdrills was studied by numerical calculation and experimental measurements under loading.The static and dynamic loads act on microdrills analyzing by finite element method (FEM).In statics,the geometric specifications of microdrills,including the size,chisel edge,etc.,were produced by computer aided design (CAD) software and transfer to computer aided engineer (CAE) software as the analytical model.The thrust and torque calculated by empirical formula were applied on the microdrill analyzing in the different feeding rates and rotation speeds.The stress analysis of microdrills in experimental measurement used on the photoelastic methods by transparent material of birefringent epoxy resin.The stress distribution in experimental measurement is shown in good agreement with FEM.Dynamic analysis is studied on the elastic-plastic,fracture,and thermal-stress problems.By means of different feeds and rotation speeds,the reaction force on microdrill machining on the workpieces of mid-carbon steel,copper,iron and grass fiber reinforced plastic (GFRP) are studied on the cutting process.In practice,the machine of microdrill often used on the drilling process for printed circuit board (PCB).Two-layered and multilayered PCBs,which are compounded on copper and multi-directional GFRP,are calculated on the FEM analysis.Under the well definition of material properties,the plastic deformation and the result of chip separation could be achieved on the FEM calculation.The generated axial reacting force obtained in FEM are in consistence with the values calculated by empirical formulas.The precise reaction force in this study has advantage on the design of the microdrill to prevent the large deform,buckling,or damage.Through defining completely material constants,the elastic-plastic,fracture,and thermal-stress problems can be analyzed on the machining process of microdrill..
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