Special-shaped tube drawing forming and conformal optimization of die cavity
(1.北京市北京交通大学机电控制工程学院2.School of Mechanical and Electric Control Engineering,Beijing Jiaotong University, Beijing 100044, China)
Abstract: Aiming at the issues in quick processing and modeling design of drawing special-shaped tube die, by Conformal Mapping Theory and the numerical trigonometry method of interpolation between odd points and even points, the conformal mapping function is obtained. As the result, three-dimension drawing forming were converted into that of two-dimension problems, and the plastic stream function was analyzed, die cavity modeling and its optimized function were set up. Combining with modern processing technology, NC program and CAM of die cavity can be realized. Taking the drawing forming of hexagon tube with arc radii r and ellipse-shaped tube as instances, the drawing die cavity optimization of special-shaped tube was achieved, as well as, the changing principle of wall thickness was analyzed.
Key words: drawing; special-shaped tube; forming; Conformal Mapping; optimization