Proceedings of SerbiaTrib '13

Serbian TribologySocietySERBIATRIB ‘1313 th International Conference onTribologyKragujevac, Serbia, 15 – 17 May 2013Faculty of Engineeringin KragujevacEFFECTS OF USING OF MQL TECHNIQUE IN METALCUTTINGGordana Globočki Lakić 1 , Branislav Sredanović 1 , Davorin Kramar 2 , Bogdan Nedić 3 , Janez Kopač 21 University of Banjaluka, Faculty of Mechanical Engineering Banja Luka, Bosnia and Herzegovina2 University of Ljubljana, Faculty of Mechanical Engineering Ljubljana, Slovenia3 University of Kragujevac, Faculty of Engineering, Kragujevac, SerbiaAbstract: In this paper an effect of using of minimal quantity lubrication (MQL) technique in turningoperations is presented. Experimental research was performed on carbon steel C45E. Technologicalparameters: depth of cut, feed rate and cutting speed were adjusted to semi-machining and roughing. Highervalues of feed and cutting speed were used, than recommended from literature, and different types of coolingand lubrication conditions in turning were applied. As a conventional procedure and technology, lubricationwith flooding was applied. As special lubrication technique the MQL was used. During research, monitoringof the cutting force, chip shape, tool wear and surface roughness was performed. Relations betweenparameters, material machinability and economy of process were analyzed.Keywords: lubrication, cutting, MQL, effects1. INTRODUCTIONThe future of metal machining by 2020 is in thedevelopment of flexible machining systems,economical and productive processes, energyefficientprocesses, production without waste,ecological production with a reduced quantity ofthe cooling and lubrication fluids and etc. Thisconclusion is based on the study National ResearchCouncil of the USA and other teams of researchers[1, 2, 3, 4].Figure 1. Possibilities to increase the productivity ofmanufacturingIncreasing of productivity (Fig 1.) is impossiblewithout utilization of modern tools and machines,modern types of cooling and lubrication fluids(CLF), CLF dosing techniques, and modernequipment. Progress is not possible withoutknowledge of the materials machinability andexpert systems for the selection of suitablemachining regimes based on machinability andprocess modelling [3]. Phases of research,obtaining and application of knowledge in the fieldof cutting process are:• study of materials machinability based onexperimental research,• modelling of the cutting process and• integration of knowledge in expert systemsand specialized databases.The main progress in developing of highproductive machining processes is realized in thearea of special CLF dosing techniques. One of thesetechniques is minimum quantity lubrication (MQL).The analysis of previous researches have shownthat this CLF dosing technique was applied forlower cutting speed (v c = 100 -150 m/min) [5, 6, 7].From the structure of the cost of machined part,it can be concluded that the cost of CLF participate15%, costs of tools 10% and costs of energyconsumption 4% of total costs (Fig 2).292 13 th International Conference on Tribology – Serbiatrib’13