Experimental research on the influence of the jet parameters of minimum quantity lubrication on the lubricating property of Ni-based alloy grinding

Abstract

Based on research on nanofluid minimum quantity lubrication (MQL) in grinding, a plane grinding experiment was performed on Ni-based alloy using a K-P36 precision numerical control surface grinder. Uniform grinding parameters were used in the experiment, but three groups of MQL jet parameters were changed. The grinding force was measured using a YDM-III99 three-dimensional dynamometer to calculate the specific grinding energy and coefficient of friction. The surface roughness of the workpiece was measured using a TIME3220 roughness tester. An experimental research was also conducted on the droplet size and velocity of the jet using a high-speed camera system. Results showed that the most ideal lubricating effect was achieved under 0.5 MPa compressed gas, 0.4 gas-liquid ratio, and 0.005 kg/s liquid flow rate. Under the best jet flow condition, the specific tangential grinding force, specific grinding energy, and coefficient of friction were 1.45 N/mm, 74.57 J/mm 3 , and 0.414, respectively. The surface roughness of the workpiece was at its most ideal at this point, where Ra, Rz, and RSm were 0.249 μm, 1.972 μm, and 0.028 mm, respectively. Based on high-speed continuous shooting at the jet, the mean droplet size was about 171.82 μm under the optimum jet parameters, and the droplets exhibited variable accelerations at a high accelerated velocity (>500 m/s 2 ).

A Cost-Effective Method for Rapid Manufacturing a Precision Mold With Microstructures Using Hybrid Manufacturing Technologies

“…Ordinarily, the main disadvantage of the precision injection mold is that the mold service life was limited by the characteristics of injection mold materials. Therefore, some reinforcing additives, such as wollastonite, molybdenum disul de [39][40][41], silica sand, glass sphere, zirconia [42][43][44], silicon nitride [45][46][47], or silica sand were recommended for adding to the injection mold. In this study, the injection mold was employed in wax injection molding for manufacturing precision wax patterns.…”

Thermodynamic Mechanism of Nanofluid Minimum Quantity Lubrication Cooling Grinding and Temperature Field Models

“…Single-step nanofluid preparation method is to disperse nanoparticles in base fluid while preparing them, which then saves the problems like nanoparticle collection and storage and can effectively avoid the oxidizing reaction of metal nanoparticles in atmosphere. This method is of high cost and small preparation quantity, and it is not suitable for actual batch application in production [6]. Two-step nanofluid preparation method is to add a certain proportion of nanoparticles in base fluid and select corresponding surface dispersant together with supersonic vibration according to physical and chemical properties so that nanoparticles can be distributed uniformly and stably in base fluid and nanofluid with suspension stability will be formed [27].…”

“…Yang et al [44] investigated the critical maximum undeformed equivalent chip thickness for ductile-brittle transition (DBh max-e ) of zirconia ceramics under different lubrication conditions and found that lubrication condition affects the normal force and ultimately influences the resultant force on workpiece, making DBh max-e decreases with increasing friction coefficient. [6]. The maximum specific tangential grinding force and μ were obtained in dry grinding.…”

“…Cooling and lubrication grinding processing method applied to industrial production at the earliest is flood grinding, namely, injecting a large quantity of grinding fluid in grinding zone in the form of continuous fluid supply. However, the application of a large amount of grinding fluids results in high cost, and moreover, "air barrier" phenomenon generated surrounding the grinding wheel, preventing grinding fluids from entering the wedge-shaped zone between grinding wheel and workpiece [6][7][8].…”

Mathematical Modeling and Computer Simulations of Nanofluid Flow with Applications to Cooling and Lubrication

“…A typical method to stabilize the nanofluid is to modify the NP surface The effective use of nanofluid lubricants have been also examined for other applications. For example, the lubrication performance of nanofluids for minimal quantity lubrication (MQL) in grinding processes was evaluated [71][72][73][74]. It was shown that nanoparticle-jet MQL achieved cooling and lubrication effects close to that of flood lubrication.…”