Application of Optimal Design and Control Strategies to the Hydroforming of Thin Walled Metallic Tubes
The paper focuses on the development and possibilities of numerical control for tube hydroforming processes, i.e. the continuous adaptation of process parameters to get the components with the required shape and thickness distribution, avoiding defects as buckling, wrinkling, necking and bursting. The control of tube hydroforming first requires the formulation of objective functions and constraint ones characterizing the shape to obtain as well as the absence of defects formation during processing. This is related to the development of quality functions previously introduced in sheet metal forming and extended to account buckling, wrinkling and bursting in tube hydroforming. Although the process control problems can be consider as optimization ones, the control problems mainly consist to the determination of process parameters that are evolving during processing. So the resulting problem consists to determine an evolution law vs processing time and a strategy is presented in the paper for accessing such an evolution law.
Jean-Claude GELIN, Carl LABERGERE
tube hydroforming, finite element modelling, sensitivity, optimization, control of processes.