Study on the behavior of the minimum quantity lubricant - MQL technique under different lubricating and cooling conditions when grinding ABNT 4340 steel
Abstract:Energy consumption, air pollution and industrial waste have received special attention from public authorities in recent years. The environment has become one of the most important subjects in the context of modern life, for its deterioration impacts the quality of life populations. Driven by pressure from environmental agencies, politicians have drawn up ever stricter laws aimed at protecting the environment and preserving energy resources. All these factors have led industry, research centers and universitie… Show more
“…Air in the aerosol provides the cooling function and chip removal, whereas oil provides lubrication and cooling by droplet evaporation. The flow of lubricant in MQL process varies from 10 to 100 ml/h and air pressure varies from 4 to 6.5 Kgf/cm 2 (Silva et al, 2005). Different ranges for flow rate were also reported in literature such as 50 to 500 ml/h (Dhar et al, 2006a) and 2 to 300 ml/h (Zhong et al, 2010).…”
“…Air in the aerosol provides the cooling function and chip removal, whereas oil provides lubrication and cooling by droplet evaporation. The flow of lubricant in MQL process varies from 10 to 100 ml/h and air pressure varies from 4 to 6.5 Kgf/cm 2 (Silva et al, 2005). Different ranges for flow rate were also reported in literature such as 50 to 500 ml/h (Dhar et al, 2006a) and 2 to 300 ml/h (Zhong et al, 2010).…”
“…Some researchers investigated the effects of grinding parameters on AISI 4340 steel grinding using conventional lubrication and MQL. They found that the surface roughness, diametric wear, grinding forces and residual stress improved when using the latter, due to optimum lubrication of the grinding zone, providing rather grain slipping at www.intechopen.com the contact zone (Silva et al, 2005;Silva et al, 2007). Brunner showed that the MQL grinding with a 4 ml/min ester oil (comparing to 11 ml/min mineral oil), when machining 16MnCr5 (SAE-5115) steel with microcrystalline aluminum oxide reduced the process normal and tangential forces to one third, however increasing the surface roughness by 50% (Tawakoli et al, 2009).…”
Section: Mql In Grindingmentioning
confidence: 99%
“…Hafenbraedl and Malkin found that MQL provides efficient lubrication, reduces the grinding power and the specific energy to a level of performance comparable or superior to that obtained from conventional soluble oil (at a 5% concentration and a 5.3 l/min flow), while at the same time it significantly reduces the grinding wheel wear. However, it presented slightly higher surface roughness values (Ra) (Hafenbraedl & Malkin, 2001;Silva et al, 2005;Silva et al, 2007). The performance was also assessed when applying dry grinding.…”
“…Experimental study on grinding of cast iron by using various nanofluid lubricating mixtures gives positive improvement in surface finish, and G ratio. [4]. Cong Mao et al had reported MQL grinding is more environmental friendly and economic for AISI 52100 steel [5].…”
Abstract:This study proposes an approach for the development of a three dimensional transient heat conduction finite element model (FEM) for grinding process. FEM simulates the temperature field in conventional and nanofluid based environmental friendly minimum quantity lubrication (MQL) grinding process. For this FEM simulation the boundary conditions were obtained on the basis of results of the heat transfer on semi-infinite object with a heat source moving along its surface. Instrumented surface grinding machine was used for experimental purpose. Lubricant used for MQL system was water based nanofluids of various concentrations. Nanoparticles of CuO and Al 2 O 3 were used for preparation of nanofluids. Grinding performance was measured in terms of workpiece surface temperature and cutting force. This model can be used to predict the cooling effectiveness of various lubrication systems. Analysis shows that the FEM temperature values matches with the experimental temperature data.
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