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天津内燃机厂精密铸造工部生产的管接头、螺栓等铸件,带有深孔、盲孔或复杂内腔,用手工或机械清理时,生产率低,不能保证清理质量。工人经过革新,试验成功了化学清砂新工艺并已投产,解决了生产关键。设备和工艺化学清砂用的主要设备,是一个中部带有加热胆的碱锅,其中盛用苛性钠的水溶液。溶液中NaOH的浓度约在40％左右。加热器(电阻丝)将碱溶液加热到沸
Tianjin Internal Combustion Engine Factory Investment Casting Production Pipe fittings, bolts and other castings, with deep holes, blind holes or complex cavity, with manual or mechanical cleaning, low productivity, can not guarantee the quality of clean-up. After the renovation of workers, the successful trial of chemical sand-cleaning process has been put into operation to solve the production key. Equipment and Technology The main equipment used for chemical sand cleaning is a soda pot with a heated pot in the middle, which contains an aqueous solution of caustic soda. The concentration of NaOH in the solution is about 40%. Heater (resistance wire) The alkali solution is heated to boiling