Transactions of Nanjing University of Aeronautics & Astronautics
Optimization of Molten Salt Cleaning Process for Surface Roughness of Remanufactured 27SiMn Hydraulic Support Column
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Abstract:
During molten salt cleaning of remanufactured 27SiMn hydraulic support column, oxidation occurs on the surface of metal substrate. This results in a change of the surface roughness of metal substrate after cleaning, which affects subsequent remanufacturing process. To decrease the effect is very important. This paper analyzed the oxidation mechanism of molten salt cleaning, explored the oxidation reaction that occurred during cleaning, and determined the key process parameters of cleaning that affecting oxidation reaction. By using central composite experimental design method and taking surface roughness variation of 27SiMn steel samples before and after molten salt cleaning as response variable to optimize the key process parameters, the optimal parameters of molten salt for cleaning remanufactured 27SiMn hydraulic support column could be obtained. The results show that the oxidation reaction of cleaning paint dirt can protect metal substrate from oxidation to a certain extent, and cleaning temperature and placement depth of metal substrate have a direct impact on the degree of oxidation reaction. When the cleaning temperature is 300 ℃ and the distance between paint dirt and free surface of molten salt is 0.5 times the height of the parts, the surface roughness variation is minimal. Therefore, the cleaning quality will be improved under such parameters.
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TG154
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