Characterization of a novel aerostatic lubrication system for deep drawing processes

摘要

For economic and ecological aspects, use of lubricants containing mineral oil in sheet metal forming is sought to be reduced or avoided. Here, the application of gaseous N2 or liquid CO2 as volatile media acting as an aerostatic lubrication system represents a new approach for dry metal forming processes. In this paper, friction mechanisms occurring in this lubrication system and main factors influencing friction conditions had been identified by extended research work. An empirical friction model is presented, allowing the prediction of resulting friction coefficients as a function of the contact normal stresses acting between sheet metal and tool surface. (c) 2021 CIRP. Published by Elsevier Ltd. All rights reserved.