Thermal and rheological behavior of ecofriendly metal cutting fluids

Abstract

Metal cutting fluids (MCFs) or cutting fluids are widely applied industrial products traditionally based on hydrocarbons. However, hydrocarbon-based cutting fluids have low thermal stability and tend to vaporize during application, causing environmental and human health problems. One of the most promising cutting fluids is based on vegetable oils, due to the high level of biodegradability and low toxicity, although vegetable oils have unsaturations that reduce their oxidation stability. This work evaluated the thermal and rheological behaviors of two chemically modified cottonseed oils: epoxidized fluid and hydroxylated fluid, besides unmodified cottonseed oil and commercial cutting fluid. The thermogravimetric analysis showed that the commercial cutting fluid starts volatization at low temperature (100°C) while all cutting fluid derivatives of cottonseed oil have thermal resistance higher than 300°C under inert atmosphere. All cutting fluids had Newtonian behavior (power-law index = 1), with viscosity up to 0.12 ± 0.05 Pa s. The small differences indicate similar lubricity. As expected, the viscosity decreased with temperature for all fluids. The apparent activation energies decreased in the order commercial cutting fluid [ epoxidized fluid [ cottonseed oil [ hydroxylated fluid. Lower apparent activation energy of hydroxylated fluid indicated better heat transfer of this fluid due to better convection. Real drilling experiments indicated lower tool wear with the use of the epoxidized fluid.

Preparation of a Water-Based Lubricant from Lignocellulosic Biomass and Its Tribological Properties

“…Both products exhibited superior oxidation stability compared with a commercially available water-based lubricant from Petronas, which had lost 20% of its mass through degradation/evaporation at 200 °C. 27 The weight loss of LAEGE and LAGLE reached 97% at 276 and 512 °C, respectively. There was no further weight loss with increasing temperature.…”

“…Besides, a 20% weight loss was observed for LAEGE at 209 °C and LAGLE at 265 °C. Both products exhibited superior oxidation stability compared with a commercially available water-based lubricant from Petronas, which had lost 20% of its mass through degradation/evaporation at 200 °C . The weight loss of LAEGE and LAGLE reached 97% at 276 and 512 °C, respectively.…”

Effect of Cutting Fluid on Milled Surface Quality and Tool Life of Aluminum Alloy

“…Currently, research on cutting fluid is mainly divided into three aspects: the application method of cutting fluid, its influence on machining, and the development of environment-friendly cutting fluid. During cutting process, to reduce cutting temperature and prolong tool life, large amounts of cutting fluid are used, which may damage for the environmental pollution and human health [ 8 , 9 ]. New application methods of cutting fluid have been widely studied to address the above problems.…”

Preparation of Multifunctional Nano-Molybdenum Disulfide and Its Tribological Properties in Water-Based Cutting Fluids

“…Owing to the high mineral oil content in oilbased cutting fluids, a large amount of oil mist and smoke are formed in the production process. 1,2 Therefore, it is easy to cause fires, which can easily lead to serious environmental pollution during the emission process. Even if the waste cutting fluids are discharged after treatment, the treatment costs are extremely high.…”

“…As lubricants, cutting fluids can be divided into two main categories in the manufacturing industry: oil- and water-based cutting fluids. Owing to the high mineral oil content in oil-based cutting fluids, a large amount of oil mist and smoke are formed in the production process. , Therefore, it is easy to cause fires, which can easily lead to serious environmental pollution during the emission process. Even if the waste cutting fluids are discharged after treatment, the treatment costs are extremely high. − Therefore, currently, water-based cutting fluids (WCFs) are widely used .…”