2017 T4 aluminum sheet alloy is a typical hard aluminum alloy in aluminum-copper-magnesium system. Its composition is reasonable and its overall performance is good. Many countries produce this alloy, is the largest amount of hard aluminum. The alloy is characterized by: high strength, a certain degree of heat resistance, can be used as working parts below 150 ° C. At temperatures above 125 ° C, the strength of the 2017 alloy is higher than that of the 7075 alloy. The hot formability, annealed and newly quenched state are good formability, heat treatment to strengthen the effect of significant