【摘要】 在对再制造27SiMn钢液压支架立柱的熔盐清洗过程中,金属基体表面发生氧化,导致清洗后工件表面粗糙度参数发生改变,影响后续再制造工序。为最大限度降低该影响,通过分析熔盐清洗氧化作用机理,探究清洗过程中发生的氧化反应,确定影响氧化反应进行的关键清洗工艺参数。采用中心复合试验设计方法,以熔盐清洗前后27SiMn钢材料样件表面粗糙度变化量为响应变量,对关键清洗工艺参数进行优化,最终获得用于清洗再制造27SiMn钢液压支架立柱表面油漆污物的最优熔盐清洗工艺参数。结果表明,熔盐清洗去除油漆污物过程的氧化反应能在一定程度上限制金属基体发生的氧化反应,而清洗温度及清洗放置深度对氧化反应程度产生直接影响。当清洗温度为300℃、样件喷漆面与熔盐自由液面间距离为0.5倍的样件高度时,表面粗糙度变化量最小,该参数下清洗质量最优。更多还原

【Abstract】 During molten salt cleaning of remanufactured 27 SiMn 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 27 SiMn 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 27 SiMn 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.更多还原