Characteristic Analysis Of Grinding Narrow-and-deep Slop With Electroplated CBN Grinding Wheel Based On Single Abrasive Grain Grinding

With the rapid development of mechanical manufacturing industry, Engine and hydraulic pump are used widely. Narrow-and-deep slops are distributed in the root of engine turbine blades and hydraulic pump rotor blades. Narrow-and-deep slop is a special construction which depth-width ratio over2and width over4mm. The quality of narrow-and-deep slop greatly determines the quality of part. Machining narrow-and-deep slop with high accuracy is a difficult problem of mechanical processing. The traditional machining methods with weaknesses such as high cost、low accuracy and can’t meet requirement of machining. Because electroplated CBN grinding wheel possesses a series of excellent performance, it has been widely used in machining narrow-and-deep slop and obtained good results.The grain size reflects the dimension of grain, which is one of the main characteristic targets of electroplated CBN grinding wheel. Grain’s dimension directly effects on taper angle20and blunt round radius rg, so it will affect the sharpness of grain. Grinding parameters directly effect on grinding force、 grinding temperature、grinding wheel wear and machining quality. This paper mainly studies the influence of grain size and grinding parameters on grinding force、grinding temperature、grinding wheel wear based on single abrasive grain grinding. Main content as follow:1) The basic principle of grinding is discussed,which mainly include the shape and distribution of cutting edge、physical model of Grinding、contact arc between grinding wheel and workpiece、undeformed chip thickness、grinding force、grinding temperature、grinding wheel wear. It provides theoretical foundation for modeling and simulation.2) The geometrical model of workpiece and single CBN abrasive grains with size36#、46、60#、80#are built. CBN grains are simplified as cone shapes with blunt round radiusrg. Workpiece is simplified as cuboid. Straight sliding model is built. Key technology of simulation is introduced, the key parameters are confirmed, such as material model of workpiece、chip separation criterion、 Material fracture criterion、meshing、friction model of rake face and chip、model of wear. the key parameters are proved to be reasonable by simulate results.3) It aimed at that narrow-and-deep slop with dimension of2×10is machined on GCr15(grinding speed40m/s、feed speed5mm/s)by CBN grinding wheel with different size(36#、46#、60#、80#).The grinding force、grinding temperature、grinding wheel wear of single CBN abrasive grain is simulated and analyzed using software DEFORM-3D.The results show that:with the size decreasing,the grinding force、grinding temperature and grinding wheel wear of single abrasive grain decrease.4) It aimed at that narrow-and-deep slop with dimension of2×10is machined on GCr15(size46#、feed speed5mm/s) by CBN grinding wheel with different grinding speed(20m/s、30m/s、40m/s、50m/s).The grinding force、 grinding temperature、grinding wheel wear of single CBN abrasive grain is simulated and analyzed using software DEFORM-3D.The results show:with the grinding speed increasing, the grinding force decrease,while the grinding temperature and the grinding wheel wear of single abrasive grain increase.5) It aimed at that narrow-and-deep slop with dimension of2×10is machined on GCr15(size46#、grinding speed40m/s) by CBN grinding wheel with different feed speed(2mm/s、3mm/s、4mm/s、5mm/s).The grinding force、 grinding temperature、grinding wheel wear of single CBN abrasive grain is simulated and analyzed using software DEFORM-3D.The results show that: with the feed speed increasing, the grinding force、the grinding temperature and the grinding wheel wear of single abrasive grain increase.