An investigation of the optimal load paths for the hydroforming of T-shaped tubes

Abstract

This paper proposes a new method to design the optimal load curves for hydroforming T-shaped tubular parts. In order to assess the mathematical models, a combination of design of experiment and finite element simulation was used. The optimum set of loading variables was obtained by embedding the mathematical models for tube formability indicators into a simulated annealing algorithm. The adequacy of the optimum results was evaluated by genetic algorithm. Using this method, the effect of all loading paths was considered in hydroforming of T-shaped tubes. Eliminating of variables with lower effect could simplify the problem and help designers to study the effect of other parameters such as geometrical conditions and loading parameters. Applying the optimal load paths obtained with the proposed method caused an improvement in the thickness distribution in the part as well as a decrease in maximum pressure.

The multi-objective optimization of the loading paths for T-shape tube hydroforming using adaptive support vector regression

“…1 The flowchart for multiobjective optimization using adaptive SVR have been successfully used to improve the efficiency of the analysis and optimization for THF process. Kadkhodayan and Moghadam [24,25] applied the RSM and design of experiment (DOE) to optimize the loading parameters for T-shape, X-shape, and Y-shape THF process. Brooghani et al [26] optimized the loading path for T-shape THF process using multi-level RSM.…”

Design and Simulation of Pulsed Loading Parameters in Tube Hydroforming

“…Dynaform is able to simulate the entire mold development process, greatly reducing mold commissioning time and reducing the cost of producing high quality covers and other stamping parts [2,9]. In order to study the pulsation loading scheme in the hydroforming of austenitic 304 stainless steel reducer, Dynaform finite element analysis software was used to establish the simulation model of the variable pipe, as shown in efficiency of the study, we only take the 1/4 of each model, divide the grid, mold, and left and right of the parts.…”

“…With the rapid development of high precision hydraulic computer control technology, RIKIMARU et al [2] proposed pulsating loading pipe hydraulic forming method, that is, in the process of forming the hydraulic pressure at the same time a certain frequency and amplitude of the sine or cosine wave. At home and abroad, it has been found that the pulsating load can promote the feeding of the pipe during hydraulic forming and reduce the obstruction of the friction and make use of the appearance and disappearance of the small folds in the forming process.…”

Numerical and experimental study on large deformation of thin-walled tube through hydroforging process

“…On the contrary, excessive axial feed leads to wrinkling and buckling, which have a strong impact on forming quality. The reasonable loading path, therefore, is a key to prevent the occurrence of these defects, which becomes the main concern for researchers [6][7][8][9]. For recent years, a new loading path called as pulsating hydroforming process of tubes has been developed based on the computer accurately controlling and verified to prevent the thickness of tube wall thinning and obtain a uniform expansion, which can effectively improve the formability [10][11][12].…”