1 适用范围
本规程适用于浸渗的操作。
2 安全操作规程
2.1 工作前要穿戴好劳动防护用品。
2.2 操作前的准备
2.3 实施
自然干燥或用经过油水分离的压缩空气吹干。
将吊筐(篮)连同铸件吊入浸渗罐内,而后顶盖夹紧,关闭进液阀和进气阀进行密封,此时应打开贮液罐压缩空气阀门,用以搅拌浸渗液。每次工作前都应搅拌浸渗液5~10min。
启动2x-15真空泵,将浸渗罐抽真空,时间为10~15min,当真空度达到负压0.08~0.09Mpa时,再延续3 min,然后停机并关闭抽真空阀门。
开启进液阀,利用浸渗中的负压将浸渗液从贮液罐吸入浸渗罐,通过液位计监视液面高度,使浸渗液面超出被浸铸件30~
开启进气阀,通入经过油水分离的压缩空气加压,当浸渗罐内压力达到0.46~0.56Mpa时,关闭进气阀,停止加压,保持20~30 min,进行压力浸渗,然后打开放气阀,降压至0.2Mpa时,关闭放气阀,打开回液阀,利用浸渗罐中的余压,将浸渗液压回贮液罐中,再次打开放气阀,使罐内恢复常压状态,关闭回液阀。
打开浸渗罐顶盖,吊出吊筐(篮),置于贮液罐的搁架上,控掉铸件表面残留的浸渗液。
将铸件在清洗罐内轻度漂洗,洗去铸件表面残留的浸渗液,对盲孔及螺纹孔等应仔细清洗,必要时用白布擦净。
铸铝件在漂洗后不进行钝化。铸铁件或铸钢件按以下规范进行钝化:三乙醇胺化学级3%;亚硝酸钠工业级0.9%;甘油化学级1%;水余量;温度室温;时间3~5s。
浸渗处理后的铸件室温放置10~20h,或在固化罐内加温至40~
每班处理完毕后,必须清理好浸渗罐,防止残余水玻璃凝固,造成管路不畅。
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