Performance improvement of eco-friendly MQL technique by using hybrid nanofluid and ultrasonic-assisted grinding
Performance improvement of eco-friendly MQL technique by using hybrid nanofluid and ultrasonic-assisted grinding
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DOI：
10.1007/s00170-017-0521-9
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发表时间：
2017-06
期刊：
影响因子：
--
通讯作者：
F. Rabiei;A. Rahimi;M. Hadad
中科院分区：
文献类型：
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作者：
F. Rabiei;A. Rahimi;M. Hadad
MQL技术在磨矿作业中具有许多技术和经济优势。它可以从表面完整性、磨削力和G比方面改善磨削性能。另一方面，MQL由于其切削液消耗量小，是一种环保型技术。尽管有这些优点，MQL技术在磨削操作中由于少量冷却而存在严重的热问题。纳米流体由于具有较高的导热系数，可以增加从工件/砂轮界面的换热。另一方面，超声加工由于其往复运动机理，减少了颗粒与工件之间的接触时间和长度，从而减少了热的产生。因此，预计同时使用这些技术可以减少热损害。本研究将MWCNT、Al_2O_3和MWCNT/Al_2O_3纳米流体混合油雾用于超声辅助磨削。MWCNT具有较高的导热系数，Al_2O_3具有良好的润滑效果。输出参数为最高温度、磨削力和摩擦系数。结果表明，与干磨相比，MQL和UAG的组合最高磨削温度降低了56.3%(从254℃降至111℃)。此外，切向磨削力和法向磨削力和摩擦系数分别降低了61.5%、47.1%和27.3%。此外，与干燥磨削中的暗色和灼伤表面相比，获得了光亮的表面，没有任何热损伤和灼伤。
MQL technique has many technological and economic advantages in grinding operation. It can improve grinding performance in terms of surface integrity, grinding forces and G-ratio. On the other hand, MQL is eco-friendly technique because of its small consumption of cutting fluid. Despite these advantages, MQL technique has a serious thermal problem in grinding operations due to a small amount of cooling. Nanofluids can increase heat transfer from workpiece/wheel interface due to its high thermal conductivity. On the other hand, ultrasonic machining can decrease heat generation due to its reciprocating mechanism and reduction of time and length of contact between grain and workpiece. So, it is anticipated that simultaneous utilization of these techniques can reduce thermal damages. In this research MWCNT, Al2O3and hybrid MWCNT/Al2O3nanofluid oil mists have been utilized in ultrasonic assisted grinding. MWCNT has high thermal conductivity and Al2O3has good lubrication effect. Output parameters were maximum temperature, grinding forces and friction coefficient. The results revealed that combination of MQL and UAG decrease of maximum grinding temperature up to 56.3% in comparison to dry grinding (from 254 to 111 °C). Moreover, tangential and normal grinding forces and friction coefficient have been reduced up to 61.5, 47.1, and 27.3%, respectively. Moreover, shiny surface without any thermal damages and burning obtained in comparison to dark and burned surface in dry grinding.