scholarly journals Characterization and Performance of Minimum Quantity Lubricants in Through-Tool Drilling

2020 ◽  
Vol 5 (4) ◽  
pp. 98-115
Author(s):  
Amla Patil ◽  
Jay Raval ◽  
Tim Bangma ◽  
Immanuel Edinbarough ◽  
Bruce Tai ◽  
...  
Keyword(s):  
High Speed ◽  
Minimum Quantity Lubrication ◽  
Air Pressure ◽  
Cluster Method ◽  
High Concentration ◽  
High Speed Imaging ◽  
Minimum Quantity ◽  
Drilling Performance ◽  
Highly Sensitive ◽  
And Performance

This study characterized airborne microdroplet diameters and size distribution from two commercially available lubricants A and B for internal minimum quantity lubrication (MQL). The effects of air pressure, oil channel size, physical properties of lubricants on the resultant microdroplets and through-tool MQL drilling performance were studied. Airborne microdroplet diameters were highly sensitive to the coolant channel sizes and air pressure. Cluster method was used to divide microdroplets into smaller clusters for comparison. Experimental data show that the average airborne microdroplet of lubricant B was larger than that of lubricant A at different air pressures and channel sizes. The contact angle of lubricant A was at least 10° less than that of lubricant B when depositing on glass or aluminium. High-speed imaging showed the tendency of more viscous lubricant B sticking to the drill tip, and higher pressure and longer time was required to atomize this viscous oil. Built-up-edges were less significant when drilling A380 aluminium with lubricant A. Due to high machinability of A380 aluminium, variation of hole diameter and hole cylindricity were minimal when drilling with different lubricants. Insignificant improvement in hole quality was observed when drilling with excessive amount of MQL lubricants or high concentration of lubricant C in flood coolant.

scholarly journals Feasibility Study on the Minimum Quantity Lubrication in High-Speed Helical Milling of Ti-6Al-4V

2012 ◽  
Vol 6 (7) ◽  
pp. 1222-1233 ◽  
Author(s):  
Xuda QIN ◽  
Linjing GUI ◽  
Hao LI ◽  
Bin RONG ◽  
Dongsheng WANG ◽  
...  
Keyword(s):  
Feasibility Study ◽  
High Speed ◽  
Minimum Quantity Lubrication ◽  
Helical Milling ◽  
Minimum Quantity

Effect of Cryogenic Minimum Quantity Lubrication (CMQL) on Cutting Temperature and Tool Wear in High-Speed End Milling of Titanium Alloys

2010 ◽  
Vol 34-35 ◽  
pp. 1816-1821 ◽  
Author(s):  
Yu Su ◽  
Ning He ◽  
Liang Li
Keyword(s):  
Tool Wear ◽  
Titanium Alloys ◽  
High Speed ◽  
End Milling ◽  
Cutting Temperature ◽  
Cutting Speed ◽  
Minimum Quantity Lubrication ◽  
Minimum Quantity ◽  
High Cutting Speed ◽  
Cryogenic Minimum Quantity Lubrication

Cryogenic minimum quantity lubrication (CMQL) is a kind of green cooling/lubrication technique, which consists of the application of a small amount of lubricant (6-100 ml/h), delivered in a refrigerated compressed gas stream to the cutting zone. This paper experimentally investigates the effect of CMQL on cutting temperature and tool wear in high-speed end milling of titanium alloys. Comparative experiments were conducted under different cooling/lubrication conditions, i.e. dry milling, refrigerated air cutting, and CMQL. The refrigerated gas equipment was manufactured based on composite refrigeration method to provide the refrigerated air. The experimental results show that application of CMQL resulted in drastic reduction in cutting temperature and tool wear especially when machining titanium alloys at a high cutting speed.

Effect of Nano-Enhanced Lubricant in Minimum Quantity Lubrication Balling Milling

2011 ◽  
Vol 133 (3) ◽  
Author(s):  
Kyung-Hee Park ◽  
Brent Ewald ◽  
Patrick Y. Kwon
Keyword(s):  
Performance Improvement ◽  
High Speed ◽  
Flank Wear ◽  
Minimum Quantity Lubrication ◽  
Angle Measurement ◽  
Suspension Stability ◽  
Edge Chipping ◽  
Minimum Quantity ◽  
Machining Conditions ◽  
Oil Mist

Minimum quantity lubrication (MQL) has been used as an alternative solution for flood cooling as well as dry machining. However, the benefit of MQL is only realized in mild machining conditions as the heat generation during more aggressive machining conditions cannot be effectively eliminated by the small amount of oil mist being applied during MQL process. To extend the applicability of MQL to more aggressive machining conditions, we have developed a potential additive to MQL lubricant. After the preliminary wetting angle measurement of the various lubricants, one commercially available MQL vegetable oil was chosen, which is then mixed in a high-speed mixer with exfoliated nanographene particles. The resulting nanoenhanced MQL lubricant was evaluated for its tribological and machining behaviors together with the suspension stability of the mixture. Friction coefficients of new nanoenhanced MQL oil were also measured in terms of loads, speeds and lubricants. Finally, MQL-ball milling tests with nanographene enhanced lubricant were performed to show a remarkable performance improvement in reducing both central wear and flank wear as well as edge chipping at cutting edge.

scholarly journals Minimum Quantity Lubrication (MQL) and its Effect on Tool Wear During Miniature Drilling :an Experimental Study

2016 ◽  
Vol 1 (2) ◽  
pp. 65-70
Author(s):  
Norsalawani Binti Mohamad ◽  
Rubina Bahar
Keyword(s):  
Tool Wear ◽  
High Speed ◽  
High Speed Steel ◽  
Minimum Quantity Lubrication ◽  
Limiting Factors ◽  
Work Piece ◽  
Machining Processes ◽  
Minimum Quantity ◽  
Tool Condition ◽  
Overall Performance

Miniature drilling is widely used in industries including electronics and reconstructive surgeries to create small sized holes. Chip removal and effective supply of coolant are the two limiting factors that make the process more complex compared to other meso scale machining processes and also contribute to the tool wear. The tool wear in the process is mainly caused by the interaction, motion and chip production between the tool and work piece. Uniform supply of coolant must be ensured to reach the drilled cavity to keep the tool wear to a minimal level. This study includes experimental investigation of the tool condition after applying Minimum Quantity Lubrication (MQL) system as a greener approach as the name indicates. The tool condition with MQL has also been compared with dry and flood cooling. Two different types of drill bit materials (High Speed Steel and Carbide) have been tested under same experimental condition to drill through Aluminum Alloy 6061 and it has been found that overall performance in terms of tool condition after applying MQL was better compared to the other two methods. The overall wear propagation area was measured for both the conditions. It was seen, the wear propagation covered minimal area with MQL while for flood and dry condition wear was spread over a bigger area on flank. 

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