金刚石滚轮修整效果与修整机理

磨削钛合金时砂轮粘附严重,砂轮修整对磨削效果的影响尤为显著.采用金刚石滚轮修整新型陶瓷氧化铝SG砂轮并进行钛合金的磨削实验,通过改变修整参数(包括轴向速度、修整深度和修整速比)对磨削力、工件表面粗糙度及表面形貌进行测量,考察不同修整参数对磨削效果的影响.研究结果表明,减小轴向速度和修整深度均使磨削力增加,同时获得较好的工件表面质量.修整速比对工件表面粗糙度的影响比较复杂.研究发现,修整速比为0.4时修整出来的砂轮磨削后工件表面质量较好.在分析实验结果的基础上,深入探讨了砂轮修整机理和工件表面形貌形成机理.实验及分析结果为金刚石滚轮修整SG砂轮磨削钛合金的修整工艺提供了依据. 

Dressing performance and dressing mechanism of diamond roller

Dressing of grinding wheel has especially significant effect on grinding behavior when grinding titanium alloys because of serious adherence between abrasives and workpiece material.Experiments of rotary diamond dressing of SG wheels for titanium alloys grinding were conducted to investigate the effects of different dressing parameters on the grinding operation.The grinding force,surface roughness and topography of ground surface were measured by varying dressing parameters,including axial speed,dressing depth of cut and speed ratio.Experiment results show that the grinding forces increase with decreasing of axial speed or dressing depth of cut and a better surface finish could be obtained simultaneously.The effect trend on surface roughness of dressing ratio is complex.It was found that the workpiece can obtain better surface quality ground by the wheels trued at speed ratio 0.4.Finally,the dressing mechanism of diamond roller and surface forming mechanism was discussed on the base of systematical analysis of effect on grinding operation of different dressing parameters.The results provide an experimental basis for diamond roller dressing of SG wheels in the grinding of titanium alloys.