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黄铜再结晶退火,采用水蒸汽保护,是保持工件表面光亮防止氧化的一种经济有效的办法。但我厂生产的密封继电器黄铜外罩,冲压拉深后用此法退火,表面常出现红色斑点,影响产品的外观质量。退火方法是将工件装进一个带有进气管和排气管的铁箱里,箱盖周围用细生铁屑粉末密封,装进45kW电炉里通入水蒸汽保护退火,在500℃下保温2.5～3h,保温完毕抽掉进气管的一端返回套在排气管上,如图
Brass recrystallization annealing, the use of water vapor protection, is to keep the workpiece surface light to prevent oxidation is a cost-effective way. However, the factory production of brass relay brass seal, after stamping deep annealing with this method, the surface often appear red spots, affecting the appearance of the product quality. The annealing method is to load the workpiece into a metal box with air inlet pipe and exhaust pipe. The cover is sealed with fine iron dust powder and put into a 45kW electric furnace to pass through water vapor to protect and anneal, and keep the temperature at 500 ℃ for 2.5 ~ 3h , After the heat is drawn off the end of the intake pipe set back in the exhaust pipe, as shown