| Summary: | 碩士 === 國立中山大學 === 機械與機電工程學系研究所 === 106 === With the development of industrial technology, the dimensional accuracy requirements for finished metal pipes for various structures are becoming more and more stringent. At the same time, end forming machines capable of producing high precision and high value are gradually gaining attention and development. Compared with the previous calendaring and extrusion processing, the forming of pipe end processing includes various forming methods, such as pipe expansion, bending, bulging, folding, shrinking and profile processing. Therefore, research and development of pipe processing and forming are of great importance in the industry.
In this study, the researcher used the finite element analysis software DEFORM to analyze the end deformation behavior of the pipe end folded, flaring, single pass forming an asymmetric high expansion rate forming. The deformation behavior of the pipe end is discussed by data such as load curve and formability. The single-pass forming die design enables the pipe ends to be formed into two different shapes which were a variety of end shapes or one end shape. By reducing the processing procedures with the geometric design of the die, the processing advantages of single pass forming are achieved. The mold design of the asymmetric pipe expansion can make the formed pipe have an asymmetrical shape. The mold design is divided into five passes, each set of dies has a pipe end expansion or an asymmetric eccentric pipe expansion. The shape of the pipe formed by the final asymmetric high expansion rate is 70% and the axial eccentricity is 6.1 mm.
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