微晶陶瓷刚玉砂轮对微电机转子轴的磨削性能评价

针对目前微电机转子轴无心外圆磨过程中砂轮修整频繁的问题，采用微晶陶瓷刚玉砂轮替代传统刚玉砂轮磨削微电机转子轴。通过搭建平面磨削工艺平台，参考无心磨砂轮修整及其磨削加工参数，从磨削温度、工件表面粗糙度、表面微观形貌、磨削比等方面，对比分析微晶陶瓷刚玉砂轮与传统刚玉砂轮的磨削性能。结果表明:相对传统刚玉砂轮，微晶陶瓷刚玉砂轮不仅有效改善磨削温度（降低38.5％），提高工件表面加工质量（表面粗糙度降低78.6％），还具有较高的砂轮磨削比（提高2.2倍）。选用微晶陶瓷刚玉砂轮对微电机转子轴进行无心磨生产线验证，结果表明:微电机转子轴无心磨样件的各项检测结果均满足实际生产指标要求，且较传统刚玉砂轮延长了1.6倍的修整周期，在提高加工质量的同时，显著提高了生产效率。 

Evaluation of grinding performance for micromotor rotor shaft by microcrystalline ceramic corundum grinding wheel

In view of frequent dressing of grinding wheel in process of centerless cylindrical grinding of micromotor rotor shaft, this paper proposes to use microcrystalline ceramic corundum grinding wheel instead of traditional corundum grinding wheel to grind micromotor rotor shaft. By building a surface grinding process platform and referring to the dressing and grinding parameters of centerless grinding wheel, grinding performance of microcrystalline ceramic corundum grinding wheel and corundum grinding wheel was compared and analyzed in grinding temperature, surface processing quality, and grinding ratio. Compared with corundum grinding wheel, microcrystalline ceramic corundum grinding wheel can not only effectively improve the grinding temperature (reduce 38.5%), improve the surface processing quality (reduce the surface roughness by 78.6%), but also has a higher grinding ratio (increase 2.2 times). In addition, microcrystalline ceramic corundum grinding wheel was selected to verify centerless grinding production of micromotor rotor shaft. The test results of centerless grinding sample of micromotor rotor shaft meet requirements of actual production index, and dressing cycle is twice longer than that of traditional corundum grinding wheel, which improves processing quality and production efficiency significantly.