Project Details
Projekt
Fluid-free lubrication systems for high mechanically loaded linear bearings by coating optimization of the functional elements
Subject Area
Engineering Design, Machine Elements, Product Development
Term
from 2018 to 2023
Project identifier
Deutsche Forschungsgemeinschaft (DFG) - Project number 407612488
Within the framework of the project, a solution is to be shown how mechanically high loaded rolling contacts can be lubricated fluid-free through the use of suitable solids and an adapted surface treatment of the counter-body. As a pilot application, a system roller bearing linear guide was selected, since this is technically highly relevant and the typical load spectrum (oscillating motion, downtime) is predestined for a fluid-free lubrication. This is where the technical feasibility is to be demonstrated and it is necessary that a stable transfer film be formed. On one hand, this is intended to separate the base body and the counter body of the tribological system in order to ensure low-wear operation and likewise to reduce the friction, so that a thermally subcritical equilibrium state is also present. Initially various solids, surface modifications and delivery options are evaluated using simple tribological tests. With the aid of modern surface analysis, the underlying transfer processes during layer formation are analyzed and targeted solutions identified. The following numerical methods (FEA and molecular dynamics) are used to model mechanisms of action.Secondly, the findings are transferred to a real demo system. The main goal of this research project is to identify the mechanisms leading to transfer film formation in rolling contacts and to be able to describe them theoretically with the help of suitable models. As a result, measures can be derived to control the processes in a targeted manner, ultimately directly in the real system. The innovative approach of the project is not only to provide a solid lubricant but also to optimally condition the surfaces on which the transfer film is to be formed by means of surface modification.
DFG Programme
Priority Programmes
