Characterization and Performance of Minimum Quantity Lubricants in Through-Tool Drilling
Characterization and Performance of Minimum Quantity Lubricants in Through-Tool Drilling
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DOI：
10.26776/ijemm.05.04.2020.01
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发表时间：
2020-10
期刊：
影响因子：
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通讯作者：
A. Patil;J. Raval;T. Bangma;I. Edinbarough;Bruce L. Tai;David Stephenseon;Obeidat Suleiman;Wayne Hung
中科院分区：
文献类型：
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作者：
A. Patil;J. Raval;T. Bangma;I. Edinbarough;Bruce L. Tai;David Stephenseon;Obeidat Suleiman;Wayne Hung
本研究表征了两种市售润滑油A和B的空气微滴直径和尺寸分布，用于内部最小量润滑（MQL）。研究了气压、油道尺寸、润滑油的物理性质对形成的微滴和通过工具的MQL钻井性能的影响。空气微液滴直径对冷却剂通道尺寸和空气压力高度敏感。采用聚类法将微滴分成更小的聚类进行比较。实验数据表明，在不同气压和不同通道尺寸下，润滑剂B的平均空气微滴大于润滑剂A。在玻璃或铝上沉积时，润滑剂A的接触角比润滑剂B的接触角至少小10°。高速成像显示，黏性较强的润滑剂B黏附在钻头上，需要更高的压力和更长的时间来雾化这种黏性油。由于A380铝具有较高的可加工性，不同润滑剂对A380铝孔直径和孔圆柱度的影响最小。使用过量的MQL润滑剂或高浓度的润滑油C时，钻孔质量改善不明显。
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.