Readequação e automação microcontrolada de um sistema de mínima quantidade de fluido lubrificante (MQL) aplicado ao fresamento

Abstract

In the machining process, lubrication and cooling are crucial stages that directly impact tool life and the surface integrity of the workpiece. However, conventional methods, such as flood lubri-cooling, generate severe bottlenecks, including high disposal costs, operator health risks, and negative environmental impacts. The Minimum Quantity Lubrication (MQL) technique, operating with flow rates between 50 and 500 ml/h, significantly reduces fluid consumption compared to the flood method, establishing itself as an efficient and sustainable alternative for processes where dry cutting is unfeasible. Given this context, this work performed the retrofitting and microcontrolled automation of an MQL system coupled to a ROMI D600 machining center, belonging to the Machining Laboratory of the Federal Technological University of Paraná, Guarapuava Campus. The original equipment exhibited flow rate oscillations and a lack of monitoring, recurrent leaks in the supply lines, and instability in mist formation. Thus, the objective of this work was to develop, implement, and validate a digital control system based on the Arduino platform and a solenoid valve to replace the old manual adjustment. As a result, the leakage and flow oscillation problems were completely solved, retrofitting the system to operate stably within the normative parameters of MQL. With the experimental validation of the calibration and the analysis of the surface roughness of the machined parts, the optimized and precise system was made available to perfectly meet the laboratory’s manufacturing operations.