Intelligent lightweight structures for hybrid machine tools
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MACHINE TOOL
Intelligent lightweight structures for hybrid machine tools H. ‑Christian Möhring1 · Matthias Müller2 · Jens Krieger3 · Jörg Multhoff3 · Christian Plagge4 · Jesper de Wit5 · Sandra Misch6 Received: 28 December 2019 / Accepted: 22 September 2020 © The Author(s) 2020
Abstract In order to improve the competitiveness on the global machine tool markets, a permanent development of new solutions and optimization of existing technologies is necessary. Besides traditional business areas, like Europe, Asia and the US, emerging countries provide interesting potential. Currently, the setup and operation of precise machine tools in these areas possesses some challenges. As an example, the foundation of the machines is often not as stable as assumed during the layout and design phase. Furthermore, the thermal boundary conditions are often characterized by much higher differences of the ambient temperature during the daily operational time compared to European conditions. These influences affect especially the performance of medium sized machine tools. Within the joint project H YBRIDi, funded by the Federal Ministry of Education and Research (BMBF) supported by the Projektträger Karlsruhe (PTKA), partners from industry and research created, realized and investigated new intelligent lightweight machine slide structures in order to overcome the named challenges. In particular, two variants of a hybrid material z-slide (RAM) with integrated sensors were built and analyzed with respect to advantages in terms of mass reduction, static and dynamic stiffness, dynamic positioning accuracy as well as thermal behavior. This paper presents the developments and results of the project. Keywords Machine tool · Lightweight structure · Dynamic behavior · Thermal behavior · Sensor integration
1 Introduction In order to develop new markets in machine tools business, emerging countries become more important [1]. Due to the existing infrastructure, the setup and operation of precise machine tools in these areas often possesses some severe challenges. Many a time, machine tools are placed at foundations, which are not adequately dimensioned considering the static and dynamic requirements of the machines.
As a consequence, the dynamic performance in terms of accelerations and jerk limits of feed axis has to be reduced consciously. Furthermore, often the thermal boundary conditions are characterized by differences of the ambient temperature during daily operational time that are much higher than those in the European area. Thus, thermal induced structural deformations occur and provoke inaccuracies in the positioning behavior of the machine. These influences affect the performance of the machine tools significantly.
* H. ‑Christian Möhring [email protected]‑stuttgart.de
Sandra Misch [email protected]
Matthias Müller [email protected]
1
Jens Krieger j.krieger@isatec‑aachen.de
Institut für Werkzeugmaschinen, Universität Stuttgart, Stuttgart, Germany
2
FOOKE GmbH, Borken, Germany
Jörg Multhoff j.multhoff@isat
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