基于阶梯分层磨削试验方法的棕刚玉砂轮磨损演变研究

Wear evolution of brown alumina abrasive wheel based on step grinding method

为提高镍基合金K4125的材料加工效率、改善其表面质量,开展棕刚玉砂轮磨削K4125的磨损试验研究。基于阶梯分层磨削、石墨复形的试验方法,探究砂轮的磨损机理,分析砂轮磨损对磨削力、工件表面质量的影响规律。结果表明:当K4125累积材料去除体积由100mm^3/mm增至125mm^3/mm时,砂轮进入剧烈磨损阶段,棕刚玉砂轮的磨削力比增加了70.3%至10.9;砂轮径向磨损量由18.0μm增至25.1μm。由于K4125表面氧化物与棕刚玉砂轮亲和性较强,砂轮磨损表面存在大量由黏附磨屑形成的磨耗平台,其材料去除能力急剧降低。综合考虑砂轮的磨损速率与磨削效果,棕刚玉砂轮磨削K4125合金的最佳材料去除体积应控制在100mm^3/mm。

In order to increase the manufacturing efficiency and improve the surface integrity of K4125 nickel-based superalloy,the grinding method with alumina abrasive wheel was studied.The wear mechanism of the grinding wheel was investigated based on step grinding method.The results indicate that the grinding force ratio increases by 70.3%to 10.9 when the specific material removal volume increased from 100 mm^3/mm to 125 mm^ 3/mm.In addition,severe grinding chip adhesion occurs during this process,while the radial wear volume of alumina abrasive wheel increases rapidly from 18μm to 25μm.It is the severe wear stage.The attrition wear stage increases due to the grinding chip which formed due to the chemical reaction between the grains and workpiece.The grinding ability decreases rapidly.As a consequence,the service life of the alumina abrasive wheel is optimized as 100 mm ^3/mm.