Research on Cooling and Lubrication Characteristics of Magnetic Assisted Aerosol in Metal Cutting
A novel technology called magnetic assisted minimum quantity lubrication(mMQL)was developed to over-come the technical limitations of insufficient cooling and lubrication performance of traditional oil-based minimum quantity lubrication in the machining of hard-to-cut materials.mMQL machining system was constructed,and Fe3O4 nanofluid was prepared as cutting fluid.The effects of different magnetic induction on the contact angle,surface tension and dynamic vis-cosity of the nanofluid were analyzed.The machining performance of mMQL were comparatively investigated.The results show that the penetrability and heat transfer capacity of the nanofluid droplets are improved under the influence of magnetic field.Compared with traditional vegetable oil MQL,the cutting temperature,tool wear and cutting force of the nanofluid mMQL applied to 430 stainless steel turning are reduced by about 35.5％,52.4％and 43.2％,respectively.During mMQL machining,the magnetized droplets easily penetrate into the friction capillary cracks in the contact region of tool-chip and tool-workpiece and spread out fully,showing better lubrication and evaporative heat transfer capabilities,and finally pres-enting better machining performance.
magnetic assisted minimum quantity lubricationmagnetic induction intensitycontact angledynamic viscos-itymachining performance
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