XY-table for desktop machine tools based on a new fluidic planar drive
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MACHINE TOOL
XY-table for desktop machine tools based on a new fluidic planar drive Berend Denkena • Haydar Kayapinar
Received: 15 February 2013 / Accepted: 7 May 2013 / Published online: 17 May 2013 German Academic Society for Production Engineering (WGP) 2013
Abstract This paper presents the design of a XY-table for desktop machine tools that makes use of a novel fluid dynamic drive principle combined with an active aerostatic planar guide for contactless motion in two directions. The presented approach reduces the installation space and the number of required components significantly when compared with electric linear motors or drives with a ball screw that are used in conventional desktop machine tools. When designing the XY-table the requirements of a micro milling process of small workpieces were considered. The arrangement of the system is presented and the drive principle is explained. Important design parameters are obtained by the support of computational fluid dynamics. Different fluid profiles for the drive are developed and compared. The results of the numerical investigations are used for the design of the XY-table whose performance is finally shown in a micro milling setup.
microstructures [1]. Conventional machine tools that are used for this purpose (e.g. ultra precision machines, desktop machines) are equipped with conventional drive and guide concepts and thus are often over-dimensioned regarding the small required working space [2]. In order to generate two orthogonal movements, usually two axes are stacked. Guiding and positioning errors of the subordinate unit are added to the error of the superimposed unit. Furthermore, the subordinate axis has to accelerate the slide of the superimposed axis in addition to the workpiece slide. Parallel kinematics bypass these disadvantages but provide a very unfavourable ratio of installation space to working space. Planar motors offer the potential to solve the abovementioned limitations of serial and parallel kinematics. All previously proposed planar motors use electrodynamic actuators [3]. Beside the need of expensive permanent magnets, winding losses are one of the main heat sources that lead to thermally induced errors in machine tools.
Keywords Direct drive XY-table Aerostatic guide Micro milling 2 Novel fluidic XY-table 1 Motivation Due to their high flexibility with respect to workpiece geometry and material, micro machining processes such as l-grinding, l-milling, l-EDM or laser ablation play a key role in the production of small workpieces or
B. Denkena H. Kayapinar (&) Institute of Production Engineering and Machine Tools, Leibniz Universita¨t Hannover, An der Universita¨t 2, 30823 Garbsen, Germany e-mail: [email protected] URL: www.ifw.uni-hannover.de
The authors propose a XY-table for the application in desktop machine tools for machining of small workpieces. It comprises a planar motor, which is based on a new fluid dynamic drive principle and an active aerostatic planar guide [4, 5]. The main advantages of this prop
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