Modeling the Hydrodynamic Lubrication Function of Scrapings in Machine Tool Slideways

Abstract

Slideways in machine tools are usually scraped to form small oil reservoirs serving as hydrodynamic wedges to generate hydrodynamic pressure and separate the carriage from the slideway during the sliding movement of the carriage. The pressure distribution and load carrying capacity are among the most important parameters in these hydrodynamic bearings. In the present work, the hydrodynamic lubrication theory has been adapted for use in modeling the hydrodynamic lubrication function of scrapings in machine tool slideways. A specially designed experimental setup was employed to verify the theoretical estimation for pressure distribution in scrapings. The experiments were implemented by using capillary tubes mounted in different distances along the scrapings for obtaining the profile of the hydrodynamic pressure distribution. The ram effect could also be clearly distinguished which exhibited its role with a pressure rise at the inlet to the bearing.