Investigation of the Technology of Microdosed supply of Lubricant Compositions with Nanoparticles during Grinding of Heat-Resistant Ni-based with Additional Air Cooling

Introduction. In terms of environmental issues, the most significant problem in the metal finishing process is the use of lubricating cooling fluids (coolant). As an alternative of coolant using in the world practice are integrating an environmentally determined engineering of minimum lubrication (MQL minimum quantity lubrication). Though the use of MQL process in the abrasion with the highest contact temperatures is not effective enough. Due to this a set of measures has been suggested in the scientific community such as, the additional cooling action of the cutting area by cold air (CAMQL - cold air with minimum quantity lubrication). As part of our paper the researches of using these methods, both separately and in synthesis, in order to assessment of capability for increasing the MQL efficiency when grinding Ni-based alloy are carried out. The purpose of the work is to quantify the influence of the MQL and CAMQL input processes on the operational factors of the grinding process and the properties of a thin surface. Vegetable soy oil is used as a lubricant. including the addition of Al2O3 nanoparticles. Research methods. The surface roughness is controlled with Mitutoyo Surfest SJ=410 profilometr. Component cutting forces are measured using a six-component force-measuring complex Amti MC36-1000. Elemental analysis and surface morphology rating are carried out using a FEI Versa 3D LoVac dual-beam raster electron microscope with an X-ray microanalysis attachment. The contact potential difference is measured by atomic-force microscopy using the Kelvin's probe method. Results and discussion. The better application conditions for MQL and CAMQL are established, these are the dosing regimens of lubricating at 30 mill and the air low range for CAMQL equals to 12 m(3)/h. The measurement results of cutting forces showed the using of soy oil lubricant only is more effective for CAMQL. On addition of Al2O3 nanoparticles with an optimal concentration of 0.4 wt. % there is observed the dramatic decline of the cutting forces, in particular P(y )Component (by 30 % relative to grinding process without coolant), and the force values are almost the same when using both MQL and CAMQL. The machined surface roughness is reduced averagely 1.5 times. While using lubricant compositions with nanoparticles, there is a tendency to lower the surface roughness values when grinding with CAMQL. The states research of a thin surface layer after grinding process showed the use of CAMQL, regardless of the lubricant type, provides reduction of surface oxidation and improvement of its properties. When using compositions with Al2O3 nanoparticles, the decrease of adhesive interaction traces of machine surface is observed.