Substrate Design And Experimental Research On Grinding Performance Of Brazed Diamond Grinding Disc

Due to good mechanical properties and economy, high strength structure steel is widely used in the field of ships, bridges, architectures and other applications. Traditional resin-based grinding wheels with corundum or silicon carbide abrasive perform abrasive falling-off, dust, substrate crack and other defects during grinding. In order to improve the bonding strength of the abrasive and substrate, a new super abrasive tool with high efficiency, long tool life, good economy and environmental protection is developed in this paper based on the high temperature brazing technology. The main contents are as follows:(1) The material of the substrate was selected and the shape of the substrate was designed. The stress and modal analysis of the substrate were conducted by finite element method and the stress distribution, the deformation, the natural frequency and the principle mode were got. Moreover,the structure of the substrate were optimized based on previous analysis.(2) The processing technology of the substrate was determined. Bending strength, micro structure and micro hardness of the substrate were tested and the influence of high temperature brazing process on its performance has been analyzed. The stress and deformation of the brazed substrate were obtained by the thermal-stress simulation analysis. In addition,the thickness of brazing filler was reasonably determined based on the analysis.(3) The manufacturing process of the brazed diamond grinding disc was determined. The interfacial micro-structure has been detected by scanning electron microscope(SEM) and X-ray diffraction(XRD). It has been observed that elemental diffusion occurred and a carbide layer of Cr7C3 existed between the diamond grits and the substrate, which contributes to the high bonding strength between the substrate and the grits.(4) Grinding experiments of high strength hull structure steel AH32 with brazed diamond grinding disc and resin grinding wheel were conducted to evaluate the grinding performance in terms of efficiency, tool life, worn surface morphology and grinding surface integrity, which also verified the reasonable design of the substrate.