The Development Of Multilayer Brazed Diamond Grinding Disc

In order to develop multi-layer diamond grinding disc（MDGD）to grind steel, a study is startedbasing on multi-hole metal-bonded diamond tools. Solid particles, suitable brazing alloy are used todevelop MDGD under brazing and sintering process to reduce grinding heat and increase diamondexposure.The researches done in the paper are summarized as follows:(1)diamond, filling material, brazing alloy, adhesives are added in rotation shaping to getenwrapped granules, the best parameters are selected: granulating time is5~8min, rolling speed is120r/min, the amount of adhesives is6~10ml/100g. Diamond segments are developed by modelingand vacuum brazing process. Using abrasion ratio and grinding efficiency as evaluation criteria, theoptimum composition is WC:WCuSnTi:WSiO2=15:70:15by one factor and orthogonal tests.(2)Mechanical performance and microstructure of the segments are investigated, the influence ofcompositions on bend strength and porosity of segments. The results show that the bend strength goesup with the increase of brazing alloy content and decreases with the increase of the porosity.Moreover, increase the value of WC:WSiO2can also improve bend strength and porosity. The range ofbend strength and porosity of segments are respectively44.6~115.8MPa and45.3%~53.2%, whichcan meet the requirements of grinding.(3)The trajectory simulation of abrasives is conducted to optimize the topography of MDGD.Using the trajectory density as an evaluation criterion, the parameters about rotating speed of spindlemotor, feed rate of workpiece, the number and the setting angle of segments are optimized bysimulation tests. The results show that the trajectory density goes up with the increase of the rotatingspeed of spindle motor and the number of segments. Meanwhile, reducing workpiece feed rate andincreasing the setting angle of segments suitably also increase trajectory density. The optimumparameters are as follows: rotating speed of spindle motor is n=11000r/min, feed rate of workpiece isVw=10mm/s, the number and the setting angle of segments are N=18, α=40°.(4)MDGD is developed by brazing process in one step. Using MDGD and resin grinding disc toconduct grinding tests. The influence of the grinding parameters and the grinding disc topography ongrinding effect is learned to verify grinding performance and the simulation design of MDGD. Trackthe wear of abrasives to verify the grinding effect of MDGD.