Patent ID: 11932915
Assignee: DALIAN UNIVERSITY OF TECHNOLOGY
Field: Materials, metallurgy (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A method for forming an aluminum alloy curved part by temperature gradient drawing, comprising forming a deep-cavity curved part from an aluminum alloy sheet by controlling formability and flow stress based on a temperature gradient, and specifically comprising the following steps:
step 1: placing the aluminum alloy sheet on a die, and closing a blank holder to hold the aluminum alloy sheet in a flange zone;
step 2: filling a cavity of a die shoe with an ultra-low temperature medium to cool a die cavity zone of the aluminum alloy sheet to a set low temperature, and forming the temperature gradient in which the temperature of the die cavity zone is lower than the temperature in the flange zone,
wherein the set low temperature is −160° C. to −270° C.,
wherein the ultra-low temperature medium is one or two of the liquid argon, liquid nitrogen or liquid helium;

step 3: applying a set blank holder force to the blank holder, and controlling a punch to move downwards to form a deep-cavity curved part; and
step 4: controlling the punch to move upwards, opening the blank holder, and taking out the formed deep-cavity curved part;
wherein before step 1 is implemented, the blank holder and the die are cooled to a cooling temperature of −180° C. to −120° C.; the blank holder and the die are provided with a circulation path for circulating the ultra-low temperature medium, and the blank holder and the die are cooled through the circulation path.