Analiza hladilno-mazalnih metod na učinkovitost brusilnih procesov

Grinding is a manufacturing process, extensively used as a finishing process to attain high precision in the production of components. Given the high specific energy and elevated temperatures involved, as well as the demands of high cutting speeds and potential for wheel loading, grinding typically relies on large quantities of cooling-lubrication fluid. However, in order to support sustainable manufacturing, alternative approaches that reduce oil consumption are required. Recent advancements in cooling and lubrication, such as single-channel lubricated carbon dioxide cooling (LCO₂), have demonstrated potential in machining with defined cutting geometries. However, they remain less explored in grinding applications. This doctoral thesis first investigated the effects of various cooling-lubrication methods, specifically emulsion and LCO₂ combined with minimum quantity lubrication (MQL), on pin-grinding of hard materials like cemented carbide. The investigation examined a number of measures, including grinding forces, force ratio, specific energy, and wheel loading mechanisms. Furthermore, the impact of LCO₂+MQL and conventional flood cooling on the performance of the surface grinding was evaluated, with a particular focus on surface roughness, residual stresses, microhardness, and cost-effectiveness. The wear of diamond tools was analysed by comparing the effects of dry conditions, emulsion, and LCO₂ in single-point dressing. This was achieved by measuring dressing forces and temperature, which allows the evaluation of dressing aggressiveness. Additionally, the study examined the topography of grinding wheel and the wear of diamond grits under varying overlap ratios and depths of dressing. The findings suggest that LCO₂+MQL can be as effective as conventional flood cooling, especially at lower aggressiveness levels, and can significantly reduce wear of the dresser in the single-point diamond-dressing process.