摘要：During molten salt cleaning of remanufactured 27SiMn hydraulic support column,oxidation occurs on the surface of metal *** results in a change of the surface roughness of metal substrate after cleaning,which affects subsequent remanufacturing *** decrease the effect is very *** 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 *** 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 *** 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 *** 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 ***,the cleaning quality will be improved under such parameters.

摘要：针对原有再制造清洗熔盐配方热稳定性低、毒性强的缺陷,进行配方改进及去除作用研究。将原有配方中易分解的NaNO2替换为Na2CO3,使用混料实验设计获得13组不同比例配方,并对其熔点进行理论计算及试验测试,获得熔点计算值与实测值的响应曲面及等值线图,利用响应变量优化器获得二者最低熔点及组分比例。验证最优配方清洗效果及清洗前后机械性能,并利用傅里叶红外光谱(FTIR)、X射线能谱(EDS)、气相色谱质谱(GC-MS)分析油漆及气体产物组分,阐释去除作用机制。结果表明,熔点计算值与实测值的响应曲面及等值线图变化趋势相同,二者熔点最大绝对值误差为3.5%,最优熔点相差5.70℃,误差率为2.74%,吻合程度高;同时依据FTIR、EDS显示的油漆主要为含酯基、羧基、硝基及芳香类基团的有机物的结果及GC-MS确定的气体产物成分,将改进配方去除作用阐释为包含裂解、氧化反应的化学作用及高温作用;此配方可在4 min内完全去除油漆,清洗前后抗拉强度和硬度变化率分别为1.68%和0.83%,表面粗糙度为0.21和0.25μm,均符合使用要求。

摘要：现有的弯曲壁板生产方式已无法满足高密度发射的型号任务需求。针对弯曲壁板加工效率低、零件尺寸一致性差等问题,实施弯曲壁板工艺优化的研究。分析了现有零件加工方法,对数控刀路进行改进,采用五轴联动切削及其路径规划技术,设计并开发了一套真空吸附装夹系统和应用测量加工一体化技术,实现壁板网格厚度的在机测量和加工深度补偿,验证了优化后的加工方案。结果表明:零件加工精度提升显著,零件加工时间缩短了50%。