Research And Preparation Of Resin Bonded Diamond Abrasive Belts

With the improvement of the industrial level and the strict requirements of the precision of the products, the diamond coated abrasives have been widely used and played an important role in domestic economy. According to the preparation methods, diamond abrasive belts were divided into two parts: the diamond electroplating belts and the resin bonded diamond abrasive belts. Some researches on the diamond electroplating belts has been done and some available products were already on the market. While the preparation of resin bonded diamond belt is different from the conventional coated abrasives. There are relatively few the domestic basic research on the resin bond diamond belt.In this study, phenolic resin used by diamond belt was modified on its molecular constitution. First, introduce a hydrophilic group by chemical modification to modify the bisphenol A type epoxy being hydrophilic, add o-cresol during the preparation of the phenolic resin to modify its flexibility and the use the waterborne epoxy resin to modify phenolic resin.By comparing the effect on the mechanical properties of phenolic resin and to analyze the different amount of epoxy resin and mechanical properties of the resin trends. In the coating experiment, the resin bonded which we selected diamond abrasive belts was produced, and coating viscosity and molding of the belts are tested. Polishing effect in the grinding of TC4 titanium alloy sheet by ceria and sodium stearate was explored through adjusting the component of brighteners.By comparing the optimum parameters of the mechanical properties of different proportions of epoxy-modified phenolic resin, PF-EP-12 was selected as the best. Its mechanical properties under the three processes were higher than the other four modified phenolic resin. A solids content of 94.45%, the impact strength was 10.58KJ/m2, tensile strength was 27.436 MPa, and all of them reach the max. Higher Rockwell hardness of67 HRB and minimum breaking elongation of 4.56%. It spells that the mix of the water-borne epoxy and phenolic resins can effectively display the role of each group, isopropyl and benzene ring structure in the PF-EP system provide a certain rigidity, an ether link on the backbone provides sufficient flexibility for the system and the curing process curve became shorter and the period became more stable.According to the coated, the viscosity of the slurry is the most important parameter which would affect the form of the belt. If the viscosity was so large that the slurry would easily adhere to the mold,on the contrary, the slurry would flow away. So the best viscosity of the slurry is 97000mPa·s and the best scale of the resin and grains is 1:1.45.According to the experiment, the addition of the 2μm ZnO powder do a lot of help on the form of the slurry, and the best dose of Zno is 15% of the summary weight. Using the product made by the slurry grinding a sheet of TC4 to find the best scale of the brightener, I found that the best addition dose of the CeO2 was 10 as same as ZnO. Only in this way I could get the lowest roughness(0.381μm) of the surface and the comparable better glossiness(240).