Study on Whole Forming Process of Unequal Thickness Inner Liner for High-Pressure Gas Cylinder

For the "thin walled and thick nozzle" high-pressure gas cylinder liner cannot be molded as a whole this problem, this paper puts forward a new technology route. A composite process based on thickening of the end and neck-spinning was designed. Through the finite element simulation to analyze the neck-spinning of the gas cylinder liner, the distribution law of equivalent stress and strain in the neck area after different passes of forming was investigated; the axial distribution of the three-way strain in different thickness layers is further discussed, and the influence laws of different process parameters on the equivalent stress and strain are derived and analyzed; the process parameters are also optimized and the optimal set of process parameters based on equivalent stresses and thickening factor is derived. The spinning experiments successfully produced a "thin walled and thick nozzle" monolithic cylinder liner, and compared with the simulation results to verify the accuracy of the model.