Stamping method and deep-drawing die for aluminum alloy liner of large-volume hydrogen storage cylinder

A method for stamping aluminum alloy liners of hydrogen storage cylinders, comprising:

• heating and stamping an aluminum ingot to form a cup-shaped rough blank;
• turning the cup-shaped rough blank on a lathe to achieve a designed size and eliminate surface defects in the cup-shaped rough blank to yield a blank;
• performing an annealing treatment on the blank to remove machining stresses and soften a microstructure of the blank;
• and
• cold deep drawing the blank to thin and lengthen the blank into an aluminum alloy liner;
• wherein the cold deep drawing comprises a single pass or multiple passes;
• when the cold deep drawing comprises the single pass, a thinning rate is controlled between 0.5 and 0.6;
• when the cold deep drawing comprises the multiple passes, the thinning rate for a first pass of the multiple passes is controlled between 0.5 and 0.6, intermediate passes of the multiple passes are controlled between 0.63 and 0.72, and a final pass of the multiple passes exceeds 0.75.