Method for pressure forming of aluminum alloy special-shaped tubular component by using ultra-low temperature medium

A method for pressure forming of an aluminum alloy special-shaped tubular component by using an ultra-low temperature medium, wherein by means of the characteristics that the forming property of an aluminum alloy tube is greatly improved under ultra-low temperature conditions, a tube is cooled and pressurized in a die through an ultra-low temperature medium, so that the tube forms a special-shaped tubular component at an ultra-low temperature, and the specific steps are as follows:

• step 1:
• putting a tube into a die, closing the die, and blocking both ends of the tube with a left punch and a right punch to effectively seal the tube;
• step 2:
• filling the tube with an ultra-low temperature medium, so that the tube is cooled to a set temperature lower than 123 K;
• step 3:
• increasing the pressure of the ultra-low temperature medium in the tube, so that under the pressure of the ultra-low temperature medium, the tube abuts against the die for forming;
• and
• step 4:
• opening the die, withdrawing the left punch and the right punch, recovering the ultra-low temperature medium in the tube, and taking out a formed special-shaped tubular component.