Effects of cooling air temperature on cryogenic machining of Ti–6Al–4V alloy
Effects of cooling air temperature on cryogenic machining of Ti–6Al–4V alloy
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DOI：
10.1016/j.jmatprotec.2010.10.009
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发表时间：
2011-03
影响因子：
6.3
通讯作者：
S. Yuan;L. Yan;W. Liu;Qiang Liu
中科院分区：
文献类型：
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作者：
S. Yuan;L. Yan;W. Liu;Qiang Liu
本文介绍了不同冷却剂策略（例如干式、湿式、微量润滑 (MQL) 和带有冷却空气的 MQL）对使用无涂层硬质合金刀片的 Ti-6Al-4V 合金铣削性能影响的实验研究。通过实验研究切削力、刀具磨损、表面粗糙度和切屑形态，以比较不同冷却空气温度的影响。结果表明，采用冷却空气的微量润滑 (MQL) 显着降低了切削力、刀具磨损和表面粗糙度。遗憾的是，MQL（无冷却空气）条件不能对切削性能产生明显影响，并且在此条件下发现刀片后刀面出现剥落磨损。采用四种不同的冷却空气温度研究冷却空气温度对Ti-6Al-4V合金切削加工特性的影响。根据实验结果，与其他冷却空气温度（0°C、-30°C、-45°C）相比，-15°C 冷却空气的 MQL 提供了更有利的效果。在具有冷却空气条件的 MQL 下会产生短切屑，因为冷却空气的高流速增强了切屑的脆性，易于断屑，并且润滑剂有效渗透到切屑-刀具界面，导致较低的摩擦。然而，由于切屑硬度在较低温度下急剧增加，具有冷却空气环境的 MQL 不能在一定程度上促进切屑卷曲。
This paper presents experimental investigations on influence of different coolant strategies such as dry, wet, minimum quantity lubrication (MQL) and MQL with cooling air on performance in milling of the Ti–6Al–4V alloy with uncoated cemented carbide inserts. Cutting force, tool wear, surface roughness and chip morphology are experimentally studied to compare the effects of different cooling air temperatures. The results showed that minimum quantity lubrication (MQL) with cooling air significantly reduces cutting force, tool wear and surface roughness. Unfortunately, MQL (without cooling air) condition cannot produce evident effect on cutting performance, and flaking wear on the flank surface of the insert has been found under this condition. Four different cooling air temperatures are used to investigate the effects of cooling air temperature on the machinability characteristics of Ti–6Al–4V alloy. Based on the experimental results, MQL with cooling air of −15°C provides more favourable effects compared to other cooling air temperatures (0°C, −30°C,−45°C). Short chips are produced under MQL with cooling air conditions due to the high velocity of cooling air enhances the chip brittleness for easy chip breaking, and the effective penetration of lubricant to the chip–tool interface results in lower friction. However, due to the dramatic increase in chip hardness at lower temperature, MQL with cooling air environments cannot promote chip curl to some extent.