Studies and Researches Concerning the Use of Porous Restrictor in the Case of Hydrostatic Guideways

Abstract

The increase of manufacturing accuracy on the machine tools depends mainly on the motion accuracy of the mobile elements as: rams, mobile tables, pads, etc., the accuracy that can be achieved, firstly, by minimization of the friction in the guide ways. Nowadays, this problem is solved by replacing the sliding friction with the rolling friction buy especially by using the hydrostatic guide ways, where the contact surfaces are separated by a continuos film of fluid supplied by a pressure. In this paper such recent constructive solutions of guide way are presented. The presented guide ways have as principal components made by porous materials. The use of the porous restrictors becomes a practical necessity due to the fact that the advantage of its applying are multiple as: reduction of the friction force, reduction of the required energy necessary to moves the mobile elements the wear reduction and the improvement of the working conditions. The paper presents a simple guide way system that contains a porous restrictor that may be successfully applied in multiple applications in the field of machine tool.