树脂金刚石砂轮加工氧化铝陶瓷的磨削工艺试验研究

Experimental study on process of grinding Al_2O_3 ceramic with resin bond diamond grinding wheel

为改善氧化铝陶瓷的磨削效果,分别使用粒度尺寸125~150μm和38~45μm的金刚石制备树脂结合剂砂轮,并进行磨削实验,研究表面粗糙度、材料去除方式和材料去除比例随磨削参数的变化规律,观察并分析氧化铝陶瓷磨削后的表面微观形貌。结果表明：氧化铝陶瓷的表面粗糙度可以达到Ra0.418μm,材料去除比例可达到95%;用粒度尺寸38~45μm的金刚石制备的树脂结合剂砂轮在切深≤2μm,工件移动速度为0.15m/min加工时,材料由延性域的塑性去除转变为脆性去除。优化后的加工工艺为先以磨料粒度尺寸125~150μm的树脂金刚石砂轮在切深为4μm时进行初步加工,再用磨料粒度尺寸38~45μm的树脂金刚石砂轮进行光磨,可以兼顾高效与精密两方面的要求。

To enhance the grinding performance on A1203 ceramics, resin bond diamond grinding wheels are prepared to conduct grinding tests, the grain sizes of which are 125 to 150μm and 38 to 45 μm respectively. Surface roughness, material removal mode and material removal proportion are studied as the grinding parameters change and the microstructure of alumina ceramics after grinding is observed and analyzed. The results show that the surface roughness of alumina ceramics can reach Ra 0.418 /am and the material removal proportion can reach 95%. When grain size 38 to 45 μm, with cutting depth no more than 2 /am and workpiece speed 0.15 m/min, the material removal mechanism changes from plastic removal to brittle removal. In conclusion, optimized grinding parameters consist of two parts, namely coarse grinding （grain size 125 to 150 μm, cutting depth 4 μm） and polishing （grain size 38 to 45 μm）, which could satisfy both requirements on efficiency and precision.