Research On Vitrified Bond Stacked Abrasive

Abrasive belt has been used more and more widely in machining field anddeveloped rapidly in recent years, due to the high grinding efficiency and goodpolishing effect for different type of surfaces. Abrasives play an important role inthe grinding belt, the current production of belt are prepared using only monolayerabrasive, resulting in a thin grinding layer as well as shorter service life thesedisadvantages not only seriously restricted the grinding efficiency, but also causedthe waste of resources. Improvement of the service life of the belt, the utilizationrate and the grinding performance of belt were payed more attentionsThis paper usesthe a combination of powder and sol-gel method is sued to to prepare the stackedceramic bond abrasive, also the relatived technical and theoretical problems werediscussed.Vitrified stacked240#SiC abrasive was prepared by spray rolling ball methodwith a low melting point powder ceramic bond, hollow glass beads, the dilutionwater glass. Study the influences of the properties of vitrified bond, the dosage ofwetting binder and the content of ceramic binder on the preparation of stackedabrasive, morphology and structure, and also study grinding performance of theabrasive belt. The results showed that: the dose of vitrified bond was5wt%,sintering temperature was750℃, binder produced liquid can be better packages andgenerate strong adhesion to SiC abrasive. Wetting dose was242ml/kg dry material,particle size of stacked abrasive in the range of1.0~1.4mm ball rate reached themaximum value was95%. Maximum grinding ratio of hollow sphere stacked240#SiC abrasive belt was71:1, the standard material removal ratio was0.89mm3/mm s.Vitrified stacked600#SiC abrasive was prepared by spray rolling ball methodwith mixed solution, expanded perlite.In this study, firstly, aluminum sol and mixedsol was prepared, studyed the influences of temperature, acidity and solid content onparticle size, morphology of synthesis of aluminum sol; discussed the influences ofacidic silica sol, and aqueous solution of LiNO3, NaNO3, Zn (NO3)2, H3BO3on theproperties of hybrid sol; secondly, stacked abrasives was prepared with600#SiCabrasive and mixed sol of ceramics bond, analyzed the influences of the wettingagent content, vitrified bond and vitrified state on the product rate, morphology ofthe stacked abrasive; finally，prepared abrasive belt and conducted grinding test. Theresults showed that:when temperature was80℃, n (H+)/n (AlOOH) was0.05, solid content was less than10%,aluminum sol could obtain small particle size and longstable period. When wetting dose was292ml/kg dry material accumulation, yield ofabrasive particle size in the range of1.0~1.4mm reached the maximum value was88.03%. Acidic silica sol, LiNO3, NaNO3, Zn(NO3)2, H3BO3would cause aluminiumsol sol particle coarsening, the size of mixed sol solution was545nm, less than theaverage particle size of powder binder (25micron); when the dose of ceramic bondwas4wt%, stacked600#SiC abrasive belt prepared by sol binder grinding roughnesswas0.35μm, which is lower than the belt prepared by powder (0.47μm).