بررسی سنگ زنی سرامیک آلومینا با استفاده از حداقل مقدار روغنکاری
Abstract
1- INTRODUCTION
2- EXPERIMENTATION
3- EXPERIMENTAL RESULTS
4- FUZZY LOGIC
5- DISCUSSION
6- CONCLUSIONS
REFERENCES
Abstract
The use of nanofluid in lubrication during machining of advanced engineering ceramics has been found to be highly efficient and eco‐friendly. This work involves experimental investigation of grinding Alumina (Al2O3) ceramic to determine the effect of the grinding variables. The grinding variables considered include depth of cut, feed rate, type of diamond wheel, and lubrication type. Moreover, the response parameters considered include grinding power, coefficient of friction, and surface quality. The responses obtained during the experiments were used to develop a fuzzy logic prediction model. The findings from this work can be concluded as follows: (a) The depth of cut and feed rate have direct proportional relationship with the grinding power and coefficient of friction. (b) The metallic bonded diamond wheel was found to have higher machining efficiency than the resinoid bonded one. (c) Higher number of diamond grits produces lower frictional coefficient. (d) The carbon nanotube based nanofluid when used in the minimum quantity lubrication (MQL) process proffers better lubrication capability than conventional flood cooling system. (e) The developed fuzzy logic models were found to have high prediction accuracies of 97.22%, 98.60%, and 96.8%, respectively, for grinding power, grinding force ratio, and surface roughness.
INTRODUCTION
Advanced engineering ceramics such as alumina, zirconia, silicon nitride etc have gained high popularity in biomedical and aerospace applications, due to their excellent hardness, high wear and thermal resistances, biocompatibility, and aesthetics. Among the conventional machining techniques used to machine advanced ceramics, surface grinding using diamond wheels is still the most efficient method utilized when processing the brittle materials. Studies have shown that machining takes up a bunch of the cost of producing advanced ceramic components. Due to their excessive hardness, there are many setbacks encountered during the machining of these kind of materials. Studies have shown that the difficulty encountered during the machining results about a great limitation to their extensive usage in various engineering fields. In addition, there is high rate formation of residual deformations such as macro and micro‐cracks, during machining of the brittle materials. These unwanted deformations have been found to deteriorate the quality of the manufactured components. As such, there is need to improve on the machining of these materials, especially improving the efficiency and achieving defect‐free components at lower costs.