Application of Minimum Quantity Lubrication in Grinding

Fluid delivery in grinding process remains an important matter requiring further research. The growing demand and the rising cost of cutting fluid usage and the environmental aspect of fluid disposal are a key driver for research into alternative fluid delivery techniques. One of the alternative fluid reduction methods employed in machining is minimum quantity lubrication (MQL). In specific grinding operations, MQL is capable of maintaining or even reducing temperature, yet using extremely small amounts of lubricant. Therefore, MQL addresses not only more economical production costs but also a critical matter of the natural and worker environment protection. This article reviews application of the MQL technique in abrasive machining in comparison to conventional and dry grinding. Common steels EN8, M2, and EN31 were ground with a general purpose alumina wheel. Results obtained determined that MQL performance can be compared to flood delivery under the conditions investigated. In some specific conditions, MQL achieved better results. Performance indicators included: grinding power, specific forces (tangential and normal), grinding temperature, and workpiece surface roughness.