Liu Guangxin, Zhao Yugang, Li Zhihao, Yu Hanlin, Cao Chen, Meng Jianbing, Zhang Haiyun, Zhao Chuang
School of Mechanical Engineering, Shandong University of Technology, Zibo 255049, China.
Micromachines (Basel). 2023 Mar 8;14(3):621. doi: 10.3390/mi14030621.
In this investigation, spherical AlO magnetic abrasive particles (MAPs) were used to polish the inner surface of ultra-fine long cobalt-chromium alloy cardiovascular stent tubes. The magnetic abrasives were prepared by combining plasma molten metal powder and hard abrasives, and the magnetic abrasives prepared by this new method are characterized by high sphericity, narrow particle size distribution range, long life, and good economic value. Firstly, the spherical AlO magnetic abrasives were prepared by the new method; secondly, the polishing machine for the inner surface of the ultra-fine long cardiovascular stent tubes was developed; finally, the influence laws of spindle speed, magnetic pole speed, MAP filling quantities, the magnetic pole gap on the surface roughness (Ra), and the removal thickness (RT) of tubes were investigated. The results showed that the prepared AlO magnetic abrasives were spherical in shape, and their superficial layer was tightly bound with AlO hard abrasives with sharp cutting; the use of spherical AlO magnetic abrasives could achieve the polishing of the inner surface of ultra-fine cobalt-chromium alloy cardiovascular bracket tubes, and after processing, the inner surface roughness (Ra) of the tubes decreased from 0.337 µm to 0.09 µm and had an RT of 5.106 µm.
在本研究中，采用球形AlO磁性磨料颗粒（MAPs）对超细钴铬合金心血管支架管的内表面进行抛光。通过将等离子体熔融金属粉末与硬质磨料相结合制备磁性磨料，采用这种新方法制备的磁性磨料具有高球形度、窄粒度分布范围、长寿命和良好的经济价值。首先，采用新方法制备了球形AlO磁性磨料；其次，研制了超细钴铬合金心血管支架管内表面抛光机；最后，研究了主轴转速、磁极转速、MAP填充量、磁极间隙对管材表面粗糙度（Ra）和去除厚度（RT）的影响规律。结果表明，制备的AlO磁性磨料呈球形，其表层与具有锋利切削刃的AlO硬质磨料紧密结合；使用球形AlO磁性磨料可实现超细钴铬合金心血管支架管内表面的抛光，加工后管材内表面粗糙度（Ra）从0.337μm降至0.09μm，去除厚度为5.106μm。
