Abstract
The present work designed and assessed a more sustainable vegetable-oil-based MQL intermittent turning process to efficiently reduce virgin vegetable oil and cutting tool. Modified waste cooking oil and multifunctional biomimetic microstructure were combined in the process. Virgin rapeseed oil (VRO) and modified waste rapeseed oil (MWRO) were utilized to form the base oil of the nanofluid bio-lubricant utilized in MQL. The volume ratio Vr of MWRO to VRO was in the range of 0 to 1. Multifunctional biomimetic microstructure was employed for the tool surface to realize bio-lubricant storage, impact resistance and bio-lubricant transport. The wedge angle Aw of the microstructure varied from 45° to 65°. First, the viscosity and the remaining amount of base oil were analyzed for the machining process. Then, this work studied the transport characteristic of the multifunctional biomimetic microstructure. Finally, tool wear rate was theoretically and experimentally investigated for varying combinations of base oil and multifunctional biomimetic microstructure. The results revealed that the average base oil viscosity, the average base oil remaining amount and the average transport speed all increased first and then decreased as Vr or Aw grew larger. The proposed process resulted in efficient reduction of virgin vegetable oil and cutting tool compared with conventional vegetable-oil-based MQL machining condition. The virgin vegetable oil and the cutting tool can be separately reduced by 33% and 35% when Vr = 0.5 and Aw = 55°.
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