Considering the Influence of Minimum Quantity Lubrication for Modelling Changes in Temperature, Forces and Phase Transformations during Machining

The purpose of this study aims at presenting a method formodelling machining processes considering MinimumQuantityLubrication (MQL) in a 2D and 3DFEMsimulation by using the example of machining tempered steel AISI 4140. All parameters required for the FEMsimulation are calculatedwithin the multiphase simulation code INSFLA and the formula for the heat conduction coefficient is derived. To consider the influence of phasetransformations of the fluid, separate experiments are performed. Furthermore, the frictioncoefficient is measured experimentally in dependence of the relative sliding velocity, contact pressureand temperature during machining with MQL as well as under dry conditions. The extended friction modelis used for the 2D and 3D models. MQLmachining experiments areperformed for the purpose of validating these models. The main focus of the experiments is layed on cutting temperatures, forces and phasetransformations on single workpieces.