微粉金刚石钎焊砂轮磨削氧化铝陶瓷的磨削力和表面粗糙度特征

在不同磨削深度、砂轮转速和进给速度组合下，研究微粉金刚石钎焊砂轮磨削氧化铝陶瓷过程的磨削力及工件的表面粗糙度的变化规律，并筛选出低磨削力和低工件表面粗糙度的加工工艺参数。试验结果表明:在微粉金刚石钎焊砂轮的磨削过程中，氧化铝陶瓷主要通过脆性断裂的方式去除；随着磨削深度、进给速度的增加，砂轮在进给方向和切深方向的力以及工件表面粗糙度都上升；随着砂轮转速的增加，进给方向和切深方向的力以及工件表面粗糙度都下降。试验获得的低磨削力和低工件表面粗糙度精密加工工艺参数分别为:磨削深度为1.0 μm，进给速度为12 mm/min，砂轮转速为24 000 r/min和磨削深度为1.0 μm，进给速度为1 mm/min，砂轮转速为20 000 r/min。低磨削力磨削时，微粉金刚石钎焊砂轮受到的X方向和Z方向的磨削力分别为0.15 N和0.72 N；精密加工后的氧化铝陶瓷的表面粗糙度值可达0.438 μm。 

Grinding force and surface roughness of alumina ceramics ground by brazed micro powder diamond wheel

Under different grinding depths, wheel speeds and feed rates, the grinding force and surface roughness of the workpiece during grinding alumina ceramics with brazed micro powder diamond wheel were studied, and the processing parameters of low grinding force and low surface roughness of the workpiece were selected.The results show that the alumina ceramic is mainly removed by brittle fracture in the grinding process;with the increase of grinding depths and feed speeds, the forces in feed direction and grinding depth direction and the surface roughness of workpiece increase; with the increase of grinding wheel speeds, the forces in feed direction and cutting depth direction and the surface roughness of workpiece decrease.The process parameters of low grinding force and low surface roughness are obtained in this study.The low grinding force would be obtained with grinding depth 1.0 μm, feed speed 12 mm/min, and wheel speed 24 000 r/min.The low surface roughness after precision maching would be obtained with grinding depth 1.0 μm, feed speed 1 mm/min and wheel speed of 20 000 r/min.For low grinding force, the grinding forces in X direction and Z direction are 0.15 N and 0.72 N, respectively.After precision machining, the surface roughness of alumina ceramics can reach 0.438 μm.