Investigation of Liquid Nitrogen Lubrication Effect in Cryogenic Machining
Investigation of Liquid Nitrogen Lubrication Effect in Cryogenic Machining
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DOI：
10.1115/wtc2005-63089
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
Shane Y. Hong
中科院分区：
文献类型：
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作者：
Shane Y. Hong
在低温加工中，液氮因其温度低而被公认为是一种有效的冷却剂，但其润滑效果尚不清楚。我们之前对切削力、刀具磨损、切屑微观结构和摩擦系数变化的研究表明，液氮可能起到了润滑作用。为了验证所提出的液氮机制并区分它们，进行了理想化的圆盘-平板接触测试。从试验结果看，低温下改变材料性能对液氮的润滑效果与材料对有关。含低碳钢或钛合金圆盘的未涂层硬质合金刀片在液氮冷却时摩擦力降低，但涂层刀片增加了摩擦力。注入液氮在两个物体之间形成物理屏障或流体动力效应总是有效的，以减少摩擦力。版权所有©2005，ASME
In cryogenic machining, liquid nitrogen (LN2) is well recognized as an effective coolant due to its low temperature, however, its lubrication effect remains unknown. Our previous studies of the change in cutting forces, tool wear, chip microstructure, and friction coefficient indicate a possible lubrication effect by LN2. To verify proposed LN2 mechanisms and distinguish them, idealized disk-flat contact tests were performed. From the test results, the LN2 lubrication effect by altering material properties at low temperature was dependent on the material pairs. An uncoated carbide insert with a low carbon steel or titanium alloy disk test showed reduction of friction under LN2 cooling, but a coated insert increased the friction force. LN2 injection to form a physical barrier or hydrodynamic effect between two bodies is always effective to reduce friction force.Copyright © 2005 by ASME