The Experimental Research On Dressing And Grinding Performance Of Resin Bonded Fine-grained Diamond Wheel

The ultra-precision grinding technology is an important part of the ultra-precisionmachining processing, and the performance of grinding wheel has an important impacton the grinding result during ultra precision grinding. In Recent years, the demand offine-grained grinding wheel is rising rapidly due to the improvement of precision ofmachining parts, but how to evaluate the performance of fine-grained grinding wheel isnot clear. This thesis makes a study on the grinding performances of the developedresin bonded fine-grained diamond wheel through the precision dressing experimentsand precision grinding experiments of tungsten carbide. The main research work is asfollows:(1) When the grinding wheel was dressed by silicon carbide dressing wheel, it wasfound that the influence of dressing wheel’s cutting depth on finishing results was notvery obvious, but it obtained better surface topography and the lower circle with smallcutting depth. The result of the experiment was obviously influenced by dressingwheel’s speed and grinding wheel’s speed, with the decrease of the dressing wheelspeed and the increase of grinding wheel speed, the surface of grinding wheel gotsufficient space for grinding chips and cutting edges had proper height.(2) The grinding ratio of wheel increased with the increase of grinding feed rateand wheel speed, the decrease of the cutting depth, and the cutting depth exerted thelargest influence on grinding ratio and the grinding wheel speed was the minimum.When grinding wheel’s speed was19m/s, the feed rate was2mm/min and the depth ofcut was the1μm, grinding ratio reached9.3.(3) The workpiece surface topography is an important parameter to envaluate thegrinding performance. Experiment results have shown that it got better surface qualitywith the decrease of the feed rate and the cutting depth and the increase of wheel speed,but small cutting depth probably tended to cause surface burns.(4) When wheel feed rate was2mm/min, the cutting depth was2μm and grindingwheel speed was19m/s, the roughness of the workpiece is30nm, which achieved therequirement of the precision grinding. The roughness was improved significantly bythe decrease of the grinding wheel feed rate, cutting depth and the increase of grindingwheel speed.(5) Finally, it was found that no-linear correlation exists between parametersthrough studying the influence of various grinding process parameters on the surface quality, and revealed that it was not reasonablis to envaluate the grinding wheelgrinding performance by one or two factors. Based on this background, the resinbonded fine-grained diamond wheel grinding performance evaluation system, whichincluds the roughness of workpiece, workpiece surface topography and grinding wheelsurface topography and grinding ratio, was proposed.The sequence of index representstheir weight in the system, and the workpiece’s roughness is the most importantindicator.