HIGH SPEED GRINDING: AN INDUSTRIAL STUDY OF LUBRICATION PARAMETERS

摘要

With this analysis of experimental and industrial data we define the significant parameters which are : particles concentration and wheel speed. Furthermore, we observe an evident correlation between the particles concentration and roughness. This can be explained by two mechanisms. Firstly, metallic and abrasive particles included in the cleaning jet are thrown on the wheel workpiece interface. These particles impact the workpiece and may affect the surface finish quality. Secondly, particles included in the cleaning jet may break the bond bridges and accelerate the wheel wear. This study gives a global approach of lubrication parameters for high speed grinding. It explains the dispersion of the roughness values and shows the existing correlations between the quality of the workpiece and the control parameters. The statistical analysis helps the industrialist to find the interactions between parameters and constitutes a quick method to structure the experience in the grinding process. The results of PCA allows to define an experimental design again. Then, we have shown that the experimental plane which requires only eight experiments allows to find quickly the optimal combination of control parameters obtaining the minimal roughness. The results obtained are linked to physical phenomena and one of our future works is to find a modelling of these phenomena. Other experimental planes have to be designed now to understand independently the effect of lubricating, cooling, cleaning and the preservation of thermal stability of the grinder.