Bending-Hydraulic Forming Stainless Steel Thin-Walled Tube Fittings Wall Thickness Distribution Law Research

In order to study the wall thickness distribution law of bending-hydraulic forming stainless steel thin-walled tube fittings, a passenger car stainless steel thin-walled tube fittings bending process and hydraulic forming simulation and experimental research, systematic analysis of the influence of process parameters on the distribution of wall thickness of the tube fittings. Bending and forming process simulation of stainless steel thin-walled tube fittings is carried out by AutoFormTubeXpertR10 software to study the effect of relative bending radius on the wall thickness distribution of the tube, and on this basis, hydroforming simulation of the bent tube fittings is carried out with different loading internal pressures. The results show that: with the increase of the relative bending radius, the maximum thinning rate and the maximum thickening rate of the tube fittings will gradually decrease, according to the simulation results to determine the optimal parameters of the bending process for the initial tube diameter of 62mm, bending radius of 95mm Based on the optimal parameters of the bending process, hydraulic forming finite element simulation, compared with the simulation results of the three kinds of internal pressure 30MPa, 40MPa and 50MPa to determine the optimal forming internal pressure of 40MPa. 40MPa is the optimal forming pressure. Finally, the thin-walled tube fittings were prepared according to the optimal process parameters obtained from the simulation, and the simulation results were verified. The experimental results were basically consistent with the simulation results, with the maximum error value of 2.27%, and the final molded parts obtained did not have any failure and met the molding requirements.