Research on Integral Hydroforming Process of Double-layered Conical Shell Component with Curved Generatrix
To solve the problems of low profile accuracy and loose fitting of inner and outer layers during the traditional block-forming and welding process for manufacturing double-layered thin-walled conical shell components,a new integral hydroforming process of double-layered conical shell component with curved generatrix is proposed in this paper.By controlling the internal pressure and clamping force,both the inner and outer conical shells are simultaneously bulged,and a double-layered conical shell component is formed as a whole by twinning.The behavior of the double-layered conical shell in contact with the die cavity during the hydroforming process was studied by numerical simulation and experiment.The profile accuracy and the thickness distribution of a double-layered conical shell component were analyzed.The results indicated that the inner and outer layers of the double-layered conical shell were deformed simultaneously.The double-layered conical shell was first fitted to the terminal of the die cavity,and then it gradually was fitted to the die cavity from the large end to the small end with the increase of internal pressure during the hydroforming process.The profile diameter deviation of a conical shell component was controlled within[-0.5 mm,+1.5 mm],and the largest diameter deviation occurred on the large end.In addition,a shrinking deformation occurred on the large end of the double-layer conical shell component.The large end with shrinking deformation was fed into the die cavity during the hydroforming process,which generated self-feeding effect to restrain the thinning of thickness,the maximum thickness thinning rate was 3.68％.
NETL
NSTL
万方数据
