A Study On Grinding Performance Of Brazed Diamond Grinding Disc Based On Optimization For Grit Topography Distribution

The high-strength steel has gotten more widely used in the field of large-scale structure such of aerospace and shipbuilding, which was mainly processed by using resin grinding wheels for surface grinding and polishing. Several problems were exposed to the application process of the resin grinding wheel such as low efficiency, great smell and pollution, grinding wheel fragmentation and other issues. To solve the above problems, the brazing technology was used to manufacture the brazed diamond disc, which has the advantages of higher efficiency, longer grinding life, lower vibration and noise, more safety and environmental protection. The main creative contents of this paper are as follows:(1) The material of the substrate was selected. By researching the resin grinding wheel wear characteristics, the disc matrix was structured, shape parameters was decided and improved by using ANSYS. The grinding grit distribution was designed as phyllotaxis by bionics, and phyllotaxis parameters was designed by researching grinding principle combined with the grinding areas.(2) Vacuum brazing furnace was chosen to braze the disc and the standardization of manufacturing process been formulated. By simulation experiment on ANSYS, the relationship between holding time while brazing with fixture was analyzed and the structure of fixture was designed.(3) The interfacial micro-structure has been detected by scanning electron microscope(SEM). 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. Grinding experiments of high strength hull structure steel AH36 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.(4) The elastic vibration isolator was designed to reduce the effects of vibration. The damping structure disc was designed based on the principles of damping vibration and noise reduction of freedom damped structure. Noise and vibration test results showed that, compared to the resin grinding wheel, freedom damping disc grinding and polishing vibration values was 48% lower and noise was 10 d B lower.