| Summary: | 碩士 === 國立聯合大學 === 機械工程學系碩士班 === 100 === The high-precision quality of deep-hole drilling process is an important issue, and the gundrill processing is one of the deep hole machining types. In this study, the vibration and stability of the gundrill tool shaft for various inner hole types and the gun drill system parameters are investigated. The model includes important properties of gundrill tool and the drilling operations, such as spinning speed, axial thrust force, velocity of conveying fluid and position of intermediate support, etc. The motion equations of gundrill tool system are derived by using the Euler-Bernoulli beam theory. Applying the assumed mode method to establish the transfer matrix, the equations of motion can be transformed into the forms of eigenvalue problem to solve the system natural frequency and buckling force. Further, 3D model of the gundrill tool is constructed with SolidWorks software, and the drawing format file is converted to the ANSYS finite element analysis software. For various inner hole types, the effects of the natural frequency and the buckling force on the gundrill tool are investigated. By both theoretical analysis and the finite element software, it can clearly understand the stability of the gundrill tool system. The results showed that the rigidity of the fan-shaped inner hole cross-section is better than the half-moon inner hole cross-section, and increase tool shaft to withstand buckling force. It is helpful for the stability of the gundrill tool. The results of the analysis can provide the design of the gundrill tool manufacturing.
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