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Research on press connection mechanism of DN25 light gauge stainless steel tube

Zhang Jian,Tang Wenxian,Wu Aisheng,Li Xianqi,Zhong Piao,Zhu Wen(School of Mechatronics and Automobile Engineering,Jiangsu University of Science and Technology,Zhangjiagang Jiangsu 215600,China)  
Light gauge stainless steel tube press-fitting method is widely used in engineering construction.Research on the press mechanism,however,has been rarely reported.In this paper,DN25 light gauge stainless steel tube is takan as an example,continuum shell element is used to simulate tube and its joint,rigid body is used to simulate pressing tool,and the result is then compared with experiments.Geometric nonlinearity,boundary nonlinearity and material nonlinearity during pressing process are considered in the simulation.Finally,effects of friction coefficient,jaw size and tube material on the press performance are studied.The results show that,the numerical results correspond well with the experimental results,and the outside deformation of U groove is larger than the inside.Friction coefficient between jaw and joint had considerable influence on the jaw resistance,reducing the coefficient can reduce the jaw resistance and increase the plastic deformation.The jaw size has little influence on the jaw resistance but the jaw resistance is sensitive to the interior size of the U groove.Increasing the jaw size can reduce the size difference between the inside plastic area and outerside plastic area of the U groove.The higher the yield strength of the tube is,the larger the jaw resistance and average springback are,which should be considered in pressing tool design.
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