Oil mist concentration and machining characteristics of SiO2 water-based nano-lubricants in electrostatic minimum quantity lubrication-EMQL milling
Oil mist concentration and machining characteristics of SiO2 water-based nano-lubricants in electrostatic minimum quantity lubrication-EMQL milling
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静电微量润滑中SiO2水基纳米润滑油的油雾浓度及加工特性-EMQL铣削
DOI：
10.1016/j.jmatprotec.2020.116964
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发表时间：
2021-04
影响因子：
6.3
通讯作者：
Xiaodong Hu
中科院分区：
文献类型：
--
作者：
Tao Lv;Xuefeng Xu;Aibing Yu;Xiaodong Hu
微量润滑加工是现代机械加工领域的一种先进的近干切削加工技术。然而，油基MQL生产过程中产生的切割油雾影响了环境空气质量，危及员工健康。针对这一缺点，提出了一种以纳米二氧化硅水基润滑剂作为切削液的新型润滑/冷却方法--静电微量润滑(EMQL)。比较了不同充电电压下二氧化硅水基纳米润滑剂和植物油的荷质比、表面张力和接触角，并用毛细管动力学方程分析了两种润滑剂的渗透性能。研究了不同润滑方式产生的油雾的吸附和沉积特性，揭示了荷电油滴的吸附和沉积机理。揭示了在不同的润滑条件下，充电电压、流量、气压、主轴转速和切割深度对PM10和PM2.5浓度的影响。最后，对比评价了二氧化硅水基纳米润滑剂EMQL对不锈钢的球磨性能。结果表明，与植物油相比，二氧化硅水基纳米润滑剂具有更好的充电性，从而表现出更强的渗透、吸附和沉积能力。与植物油MQL相比，-4KV的二氧化硅水基纳米润滑剂EMQL具有最低的油雾浓度和相似的加工性能，其浓度接近美国国家职业安全与健康研究所(NOISH)的标准。荷电性能优良的二氧化硅水基纳米润滑剂液滴具有较好的吸附和渗透性能，使荷电液滴容易被静电吸附在机床内并渗透到切削区，从而减少了加工环境中的油雾含量，表现出替代的切削性能。
Minimum quantity lubrication (MQL) machining is an advanced near dry cutting technology in modern machining field. However, the cutting oil mist produced during the process of oil-based MQL affected the ambient air quality and endangered the health of employees. To avoid this drawback, a novel lubrication/cooling method called electrostatic minimum quantity lubrication (EMQL) which used SiO2water-based nano-lubricant as cutting fluid was proposed. The charge mass ratio, surface tension and contact angle of SiO2water-based nano-lubricant and vegetable oil with different charging voltages were compared, and the penetration performance of these two lubricants was analysed using capillary dynamics equation. The adsorption and deposition properties of oil mist produced by different lubrication methods were investigated, and revealed the adsorption and deposition mechanisms of the charged droplet. The influences of the charging voltage, flow rate, air pressure, spindle speed and cutting depth on PM10 and PM2.5 concentrations under different lubrication conditions were revealed. Finally, the milling performance of SiO2water-based nano-lubricant EMQL of stainless steels was evaluated comparatively. The results showed that SiO2water-based nano-lubricant presented better chargeability compared with vegetable oil, and thus displayed stronger penetrability, adsorption and deposition capacity. SiO2water-based nano-lubricant EMQL with -4 kV showed the lowest oil mist concentration and similar machining performances compared with the vegetable oil MQL, and the concentration values were close to the standards set by the National Institute for Occupational Safety and Health (NOISH). The charged SiO2water-based nano-lubricant droplets with excellent charging performance presented better adsorbability and penetrability, so that the charged droplets were prone to be electrostatic adsorbed in the machine tool and penetrated into the cutting region, which reduced the oil mist content in the machining environment and presented alternative cutting performance.
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DOI：
--
发表时间：
1997
期刊：
Lubrication Engineering
影响因子：
--
作者：
R. S. Marano;J. Smolinski;C. Manke;E. Gulari;R. Messick
通讯作者：
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2000-07
影响因子：
3.6
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通讯作者：
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DOI：
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发表时间：
2018-07-01
影响因子：
3.6
作者：
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通讯作者：
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DOI：
10.1016/j.matpr.2016.04.090
发表时间：
2016
期刊：
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影响因子：
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作者：
A. Sharma;R. Singh;A. Dixit;A. Tiwari
通讯作者：
A. Sharma;R. Singh;A. Dixit;A. Tiwari
影响因子：
11.1
作者：
Behrooz Zareh-Desari;B. Davoodi
通讯作者：
Behrooz Zareh-Desari;B. Davoodi