Research On Diamond Grain Protrusion Height Of Resin Bond Abrasives

The process of the diamond abrasive tool grinding workpiece is a machining process of micro-cutting by the diamond abrasive grains exposed on the surface of the abrasive tool.During this process the cutting edge height of abrasive particles will have an important impact on the grinding ration,efficiency,and the surface quality of the workpiece.As the height of abrasive grain protrusion is low,the grinding performance is very poor,which will lead to the inability to carry out grinding.If the height is too much more the wearing rate of abrasive tool will be accelerated,which will lead to the uneconomical use of abrasive tool.In the grinding process the abrasive particles on the grinding tool surface will be dull,broken and spiltted away off owning to the abrasives worn off,which will not only affecting the cutting edge of the grinding tool surface,but also damaging to the grinding workpiece surface.The cutting edge height of abrasive is the key factor to affect the grinding performance of abrasive tools,which can be taken for evaluating of abrasives performance,wear state and predicting abrasive wear trend.However,there is no clear evaluation system for the relationship between grinding tool edge height and grinding performance.The purposes of this paper is to study the prostrusion height of diamond abrasive grain by means of scanning electron microscope(SEM)and 3D reconstruction technology under computer aided system.the effects of abrasive concentration,abrasive particle size and forming density on the edge height of diamond abrasive particles are investigated as well.The relationship between the height of grain prostrusion and its grinding performance was studied by friction and wear test.The results show that:1.The maximum rough height Rz measured by the 3D rough height reconstruction system under the scanning electron microscope(SEM)is closer to the hight of grinding grain prostrusion,and it can be used to characterize the edge height of grain prostrusion.2.In the case of the same hardness and grinding parameters of the grinding tool,the amount of change in the edge height of the abrasive grains on the surface of the grinding tool decreases with the increase of the diamond concentration.The diamond abrasive grains having a particle size of 40/45 had a blade edge height change value at a concentration of 100% and a blade edge height change value at a concentration of 25% decreased by 52.6%.The value of the edge height change of the diamond abrasive grain having a particle size of 70/80 at a concentration of 100% was 56.1% lower than that of the blade edge height at a concentration of 25%.3.When the wear time increases,the number of friction between the diamond grinding tool and the marble piece increases,and the friction coefficient decreases with time until it becomes stable.4.The higher the height of the sharpening edge of the grinding tool,the larger the grinding ratio of the grinding tool.The higher the height of the abrasive blade is,the more effective the sharpening surface area is involved in the grinding.The sharper the grinding tool is,the more beneficial it is to improve the grinding of the grinding tool.Cutting efficiency.