Abstract
Minimum quantity lubrication (MQL) has gained significant attention in various research fields and industrial applications for its advantages of being environmentally friendly and suitable for sustainable production. The effectiveness of MQL is increasing significantly by using nano cutting fluid, which can be produced by suspending nanoparticles in the based cutting fluid. This study aims to investigate the effects of MoS2 nanoparticle concentration, cutting speed, and feed rate on MQL hard turning of 90CrSi steel in terms of surface roughness and surface microstructure. The Box–Behnken experimental design was used to analyze the influence of input parameters and their interaction effects as well as to find the optimal set of variables. The obtained results prove the improvement of the machinability of carbide tools due to higher cooling and lubricating performance created by MoS2 nanofluid MQL, which contributes to improve the surface quality and reduce the manufacturing cost. There is an interaction effect between nanoparticle concentration and feed rate which has a strong influence on surface roughness.
Highlights
In recent years, green and sustainable machining processes have gained growing concern in the metal cutting industry
The authors concluded that the cutting temperature significantly decreased, hole surface quality improved, and tool life was much prolonged compared with the dry condition
It can be clearly observed that the large Fisher coefficient (F-Value) for the survey model was 15.65 and the probability p value was less than 0.05, which proves that the selected quadratic model is suitable, and there is only a 0.01% chance for this model to be affected by noise factors [31]
Summary
Green and sustainable machining processes have gained growing concern in the metal cutting industry. In the MQL method, a very small amount of cutting oil is directly sprayed in oil mist form into the cutting zone to reduce the friction and improve the lubricating effect It brings out a better surface quality and longer tool life than wet and dry machining methods [2,3,4,5]. The authors concluded that the cutting temperature significantly decreased, hole surface quality improved, and tool life was much prolonged compared with the dry condition Another promising solution is that the use of nano cutting fluid rather than conventional ones to improve the cooling and lubricating effects; this has been considered as a novel solution to overcome the main problems of the MQL technique [11]
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