A Study on Machining and Environmental Characteristics of Micro-Drilling Process Using Nanofluid Minimum Quantity Lubrication

2011 ◽  
Author(s):  
Jung Soo Nam ◽  
Pil-Ho Lee ◽  
Sang Won Lee
Keyword(s):  
Experimental Studies ◽  
Minimum Quantity Lubrication ◽  
Compressed Air ◽  
Drilling Process ◽  
Environmental Characteristics ◽  
Minimum Quantity ◽  
System A ◽  
Micro Drilling ◽  
Nanofluid Minimum Quantity Lubrication ◽  
Oil Mist

This paper presents two basic experimental studies of a micro-drilling process with nanofluid minimum quantity lubrication (MQL) in terms of machining and environmental characteristics. By using a miniaturized desktop machine tool system, a series of micro drilling experiments were conducted in the cases of dry, compressed air and nanofluid MQL. The experimental results imply that nanofluid MQL significantly reduces the adhesion of chips when compared with the cases of dry and compressed air micro-drilling. As a result, it is observed that the magnitudes of average drilling torque and thrust force are decreased and the tool life of micro drills is extended in the case of nanofluid MQL micro-drilling process. In addition, the empirical study on environmental characteristics of MQL micro-drilling process is conducted by measuring MQL oil mist with the oil sampling method. The results show that remaining MQL oil mist is tiny enough not to have a detrimental effect on human health.

A Parametric Analysis on Micro-Drilling Process With Nanofluid Minimum Quantity Lubrication

2013 ◽  
Author(s):  
Jung Soo Nam ◽  
Dae Hoon Kim ◽  
Sang Won Lee
Keyword(s):  
Feed Rate ◽  
Parametric Analysis ◽  
Large Diameter ◽  
Minimum Quantity Lubrication ◽  
Drilling Process ◽  
Machining Parameters ◽  
Minimum Quantity ◽  
Micro Drilling ◽  
Nanofluid Minimum Quantity Lubrication ◽  
Thrust Forces

This paper presents a parametric analysis on microdrilling process using nanofluid minimum quantity lubrication (MQL). In this paper, the effects of several machining parameters such as a feed rate, rotational speed and drill diameter on micro drilling performances are investigated under various lubrication conditions — compressed air lubrication, pure MQL and nanofluid MQL. For nanofluid MQL, nanodiamond particles are used with the volumetric concentration of 4 %. A series of microdrilling experiments are carried out in the miniaturized machine tool system. The experimental results show the nanofluid MQL can be effective for reducing average drilling torques and thrust forces, in particular, at relatively low feed rate (10 mm/min) and low spindle speed (30,000 RPM) in the case using the drill with small diameter (0.1 mm). Meanwhile, in the case using the drill with large diameter (0.5 mm), the nanofluid MQL may not be effective for reducing average torques and thrust forces.

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