Machining evaluation of a hybrid MQL-CO2 grinding technology

Although there are already successful industrial experiences in other machining industries with the elimination of coolants, this is not so in the grinding industry due to the large amounts of generated heat that must be evacuated from the contact zone. In this work, a new approach to the elimination of fluids in grinding is presented. The technology is based on the use of a hybrid Minimum Quantity of Lubricant (MQL)-low temperature CO2 system that reduces lubrication consumption. Abrasive grits are protected by the layer of frozen oil, resulting in a significant improvement in grinding wheel life and surface quality of the machined component. Although the cooling action is reduced with respect to the conventional coolant, no thermal damage was observed on the workpiece.