Abstract: 6062 aluminum alloy is annealed, and then is treated by deep cryogenic temperature at different time. Through stretching, hardness measurement and punch-shearing experiments, the effect of cryogenic temperature on the material properties is analyzed. The results show that the mean annealing and cryogenic temperature at different time can improve the smooth zone and reduce burr or reduce burr height. With the increase in cryogenic time, the intensity is reduced, however, the plasticity is improved. While, the temperature returns from cryogenic to normal the intensity increases step by step, and the burrs are reduced and smooth zone increases and then decreases. The tests were treated by deep cryogenic temperature for 8 h and kept real-time cryogenic temperature, and punch-shearing was carried out and comprehensive quality, such as collapse angle, burr and smooth zone, is best. If the target is to reduce the burr, after 8 h cryogenic treatment and return to room temperature, the result of real-time punch shearing is better.

Key words: materials synthesis and processing technology, 6061 aluminum alloy, annealing treatment, deep cryogenic treatment(DCT), punch shearing