【作者】 朱军；

【导师】 田宗军；

【作者基本信息】 南京航空航天大学 ， 机械制造及其自动化， 2011， 硕士

【摘要】 电铸是一种利用电沉积方法来成型金属零件的精密制造技术。采用传统的电铸工艺可以获得许多具有特殊功能的电铸层，但其铸层南多组织不均匀、性能不够稳定，存在针孔、积瘤、麻点等缺陷。为了改善电铸质量，本文提出了摩擦辅助喷射电沉积技术，在电铸过程中加入摩擦辅助装置，阴极在电机的驱动下做转动，使摩擦辅助装置对阴极表面持续磨擦和扰动，以实现对回转体零件的一次快速精密电铸成型。完成的主要工作如下：（1）以数控喷射电沉积机床为基础，构建磨擦辅助喷射电沉积系统。（2）使用摩擦辅助喷射电沉积技术沉积出镍铸层，采用透射电镜（TEM）、X射线衍射（XRD）等分析手段，对镍铸层的表面形貌和组织结构进行了检测与分析，研究表明：用摩擦辅助喷射电沉积技术进行电铸，南南提高了电铸速度，有效去除沉积层表面的针孔、积瘤、麻点等缺陷，获得的铸层外表面Ra值达到0.096μm。所得镍电铸层的组织致密，晶粒分布均匀，晶粒南小在5～40nm之间，硬度明显提高，磁性能也有较南改变。（3）研究电流密度、阴极转速、喷嘴高度、喷射流速、喷嘴南小等工艺参数对于摩擦辅助喷射电沉积镍铸层的微观结构和性能的影响，并对工艺参数进行了优化。（4）使用摩擦辅助喷射电沉积系统，制备一批随沉积时间变化的镍铸层，研究摩擦辅助装置在铸层增厚过程中对铸层微观结构的影响。通过分析表明：加入摩擦辅助装置后，随电铸时间的增加，铸层质量可以一直保持良好的状态。最后，使用优化的参数制备了厚度达1mm的铸层，铸层表面仍然光亮平整。更多还原

【Abstract】 Electroforming is a precision manufacturing technology for forming metal parts using electrodeposition method. Traditional electroforming process can get electroforming layer with a lot of special features, but most of the layers have nonuniform organization, the properties are not stable enough, and there are pinholes, nodules, mechanical pitting and other defects in electroforming layer. In order to improve the electroforming quality and explore the new method of electroforming parts rapid prototyping, this paper presents friction aided jet electrodeposition technology, adding friction aided device in the electroforming process, cathode is rotated by the driven of motor, and the cathode surface were frictioned continually by the friction aided device, in order to achieve electroforming rapid precision prototyping of rotary part .The main work which have done as follows:(1) A friction aided jet electrodeposition system has been builted based on CNC jet machine.(2) Ni-costing layer were maked by friction aided jet electrodeposition technology, and the surface morphology and organization structure of the layer were detected and analyzed using transmission electron microscopy (TEM), X-ray diffraction (XRD) and other methods.The research shows that friction aided jet electrodeposition technology has greatly enhance electroforming speed, eliminate the surface pinholes, nodules, mechanical pitting and other defects effectively, and obtain the value of Ra of outside surface of cast reaches 0.096 m. The Nickel electroforming layer have dense organization, uniform grains, the grain size between 5 ~ 40nm, the hardness was increased and there are large changes in magnetic properties.(3) The experiment study the effection of current density, cathode rotation speed, nozzle height, jet velocity, nozzle size and other parameters for the microstructure and properties of friction aided jet electrodeposition of nickel cast layer, and optimize the process parameters.(4) Making some nickel cast layers which change with deposition time using friction aided jet electrodeposition system, and study the effection of friction aided device for the microstructure in the thicker increaseing process of casting layer. The analysis shows: Added friction aided device, casting layer quality can be maintained in good condition with the time increasing. Finally, casting layer with 1mm thickness were prepared with optimized parameters, and the surface is still bright and smooth.更多还原