| Summary: | 碩士 === 國立勤益科技大學 === 機械工程系 === 105 === In this study, the situation of radial compression forming process of micro - tube is discussed. During this study, titanium alloy (Grade1) and stainless steel (SUS304) are used for micro-tube radial compression process analysis. The influence of different pipe thickness(0.1mm、0.15mm、0.2mm、0.25mm) and different friction coefficient(0.03、0.06、0.09、0.12) on the radial compression process of miniature circular pipe is on a major discussion. Through the scale factor amendment of the material parameters of the finite element program analysis, the difference between the thickness of the different pipe and the different friction coefficient on the radial compression forming of the micro-tube is shown. During this study, the proportionality factor correction of the material parameters of the finite element program analysis given ways to understand the different mold cone angle and the different strain hardening indices differ in the shape of microcapsules during necking. The forming process also uses the generalized rmin algorithm to deal with the contact problem between the elastoplastic state and the mold contact surface. SRI (selective reduced integration) and the four-quadrilateral degenerate shell element are used to derive the shape function into the rigid matrix.
The focus of this paper is to explore the dimensions of the pipe and the influence of the material parameters on the radial compression forming process of the micro-tube. The micro-stamping process verifies the simulation and analysis of micro-circular tube in the radial compression process of all the deformation history information, relationship between punch load and punch stroke, stress and strain distribution, pipe thinning rate, the curvature of the tube, and the axial warping value, comparing with the simulation results to verify the reliability of the analytical program. According to finite element analysis and the experimental results, it shows that minimum thickness and the maximum principal stress and the principal strain are concentrated in the region of the micro tube. Furthermore, using different process parameters of the analysis, such as mold cone angle, friction coefficient and strain hardening index, the analysis results show that the greater the cone angle of the mold, the greater the punch load of the miniature tube. On the other hand, the change of friction coefficient has little effect on the punch load.
The method proposed in this paper can effectively simulate the radial compression forming process of miniature circular tube. Therefore, it can be widely used in various forms of compression process, provide complete analysis of the data, anticipate the problems that may arise in the compression process and provide solutions to manufacturer to reduce the problems arising from the processing process. It is beneficial to reduce the loss of trial and error and increase the production efficiency and competitiveness.
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