Investigation of the influence of the additivation of a biological metalworking oil in cryogenic machining

Abstract

In recent years, cryogenic minimum quantity lubrication (CMQL) has increasingly become the focus of research. With this cooling strategy, it is possible to cool and lubricate the cutting zone individually by regulating the oil and liquid carbon dioxide (CO2) flow. The used oil has a crucial influence on the performance of the technology. The content of this study is to investigate the influence of the additivation of a biological metalworking oil on a milling process, rough and finish turning process of X2CrNiMo17-12-2 and 100Cr6 in combination with cryogenic minimum quantity lubrication. For this purpose, a mineral and a biological base oil (coconut oil) have been additivated with the same additive. For rough turning process, another biological base oil (sunflower oil) is additivated and investigated. On the one hand, the influence of the additive on the parameters of the cutting process (cutting speed, feed rate, rotational speed, etc.) is studied. On the other hand, the impact on the cryogenic machining parameters (CO2 flow rate) will be investigated. The results are compared regarding wear, process forces and productivity.