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一、前言 LY12合金是飞机制造业中使用最普遍的铝合金,它广泛地应用于飞机各类结构件。LY12合金零件的成型通常采用机械加工或钣金成型。在钣金零件中,LY12合金制件占所有钣金零件的80～90％。历年来,钣金成型工艺中的退火工序均按No.747-59生产说明书中的完全退火规范(410℃1小时,30℃/小时冷至260℃出炉)和快速退火规范(360℃1小时出炉空冷)。实践证明,用这种规范处理后,合金
I. Introduction LY12 alloy is the most commonly used aluminum alloy used in the aircraft manufacturing industry, which is widely used in various structural parts of aircraft. LY12 alloy parts are usually formed by machining or sheet metal forming. In sheet metal parts, LY12 alloy parts accounted for 80 to 90% of all sheet metal parts. Over the years, sheet metal forming process annealing process according to No.747-59 production specification complete annealing specification (410 ℃ 1 hour, 30 ℃ / hour cold to 260 ℃ baked) and rapid annealing specification (360 ℃ 1 hour Baked air-cooled). Practice has proved that, with this specification, the alloy