Comparison of lapping performance between diamond magnetic abrasives and silicon carbide magnetic abrasives
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摘要: 针对硬脆材料的硬度高，传统的碳化硅磁性磨料研磨效率低、磨料寿命短等问题，开发以金刚石颗粒作为研磨相的磁性磨料。以高纯铁粉为铁基相，金刚石为研磨相，采用树脂黏结法制备金刚石磁性磨料。以K9玻璃为加工对象，比较金刚石磁性磨料和碳化硅磁性磨料磁力研磨K9玻璃时的使用寿命和加工效率。实验得到金刚石磁性磨料的寿命为60.00 min，能够将K9玻璃的平均表面粗糙度Ra加工至0.036 μm，在使用寿命内能够加工的工件为4.6件；而碳化硅磁性磨料的寿命仅有40.00 min，只能将K9玻璃的平均表面粗糙度Ra加工至0.222 μm，在使用寿命内能够加工的工件为3.6件。金刚石颗粒作为研磨相能够有效地提高磁性磨料的使用寿命、加工能力以及磁力研磨的加工效率。Abstract: The hardness of hard-brittle materials is high, which results in the low lapping efficiency of traditional silicon carbide magnetic abrasive and short abrasive life. In view of this situation, a magnetic abrasive with diamond particle as lapping grit was developed. Using high purity iron powder as iron-based phase and diamond particle as abrasive, diamond magnetic abrasives were prepared by resin bonding method. K9 glass was chosen as the part being machined. The service life and processing efficiency of magnetic lapping K9 glass were compared between with diamond magnetic abrasives and with silicon carbide magnetic abrasives. The lifespan of diamond magnetic abrasive is 60.00 min, and the number of work-piece which can be machined is 4.6 pieces in the service life. The average surface roughness of K9 glass reaches 0.036 μm. However, the service life of the silicon carbide magnetic abrasive particles is only 40 min, and the average surface roughness of the K9 glass workpiece can only be processed to 0.222 μm. Besides, the number of workpieces that can be processed during the service life is 3.6 pieces. Diamond magnetic abrasives can effectively improve the service life, the processing capacity of magnetic abrasives, and the processing efficiency of magnetic grinding.
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Key words:
- magnetic abrasive /
- diamond /
- silicon carbide /
- service life /
- lapping efficiency
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图 6 SiC磁性磨料研磨K9玻璃表面形貌变化
Figure 6. Surface morphology of K9 glass at different finishing phase by SiC magnetic abrasives
图 7 金刚石磁性磨料研磨K9玻璃表面形貌变化
Figure 7. Surface morphology change of lapping K9 glass by Diamond magnetic abrasives
表 1 制备参数
Table 1. Prepare parameters
制备参数 参数值 研磨相粒径 d /μm 25 铁基相粒径 D / μm 75 筛网粒径 r / μm 90～180 黏结剂 环氧树脂 
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表 2 寿命比较试验加工参数
Table 2. Lifespan comparison of experimental processing parameters
加工参数 类型或取值 磁极头转速 v/（r·min−1） 800 加工间隙 d / mm 2 磨料填充量 m /g 2 直线研磨轨迹 l / mm 40 研磨时间 t /（min·次−1） 5 研磨液 油性研磨液
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