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Methodology for Process-independent Energetic Assessment of machine tools

Procedia Manufacturing 2017年 8卷 254-261页

作者： Paetzold, Jörg Kolouch, Martin Wittstock, Volker Putz, Matthias Institute for Machine Tools and Production Processes Technische Universität Chemnitz Reichenhainer Straße 90 Chemnitz 09126 Germany Fraunhofer Institute for Machine Tools and Forming Technology Reichenhainer Straße 88 Chemnitz 09126 Germany

Energy-labels draw users’ attention to energy efficiency and thus they force the manufacturers to reduce the energy consumption of their products. This paper focuses on the large variety of metal-cutting machine tools, representing a challenge to find an evaluation basis for a unique energy-label. For this reason, the process-independent energy consumption has been compared to machine tool features and properties. The data-base contains measured values and has been extended by values from literature. Concerning a large number of various machining centers for milling operations, the statistical analysis shows the influence of the different machine tool features and properties on energy consumption. Finally, an evaluation basis is presented and the applicability on energy-labels is discussed. © 2017 The Authors

关键词： energy-efficiency energy-label machine tools statistical analysis

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Multi-functional battery housing for electric vehicles

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Lightweight Design worldwide 2017年第5期10卷 26-31页

作者： Schmerler, Rico Gebken, Tobias Kalka, Sebastian Reincke, Tobias Fraunhofer Institute for Machine Tools and Forming Technology IWU Wolfsburg Germany Technische Universität Braunschweig Germany Fraunhofer Institute for Wood Research WKI Hannover Germany

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[POSTER] Industrial Augmented Reality: Transferring a Numerical Control Connected Augmented Realty System from Marketing to Maintenance

[POSTER] Industrial Augmented Reality: Transferring a Numeri...

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IEEE International Symposium on Mixed and Augmented Reality Workshops (ISMARW)

作者： Christian Kollatsch Marco Schumann Philipp Klimant Mario Lorenz Institute for Machine Tools and Production Processes Chemnitz University of Technology IWU Fraunhofer Institute for Machine Tools and Forming Technology Department of Orthopedics Trauma and Plastic Surgery

ISBN: (纸本)9781538614549

Connecting third party systems like machine controls and product data management systems with Augmented Reality (AR) support applications is crucial for their industrial success. We present a marketing use case of a Virtual Press demonstrator where the connection to a machine control was successfully implemented. The realization of this application utilized the AR framework ARViewer that is introduced in this paper. Subsequent, an outlook is given how this framework can be extended using three examples of AR maintenance applications.

关键词： Augmented reality

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Evaluation of Shape Memory Alloy Bulk Actuators for Wear Compensation in Ball Screw Drives

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IFAC-PapersOnLine 2016年第21期49卷 88-94页

作者： Drossel, Welf-Guntram Junker, Tom Bucht, André y de Sosa, Iñaki Navarro Pagel, Kenny Fraunhofer Institute for Machine Tools and Forming Technology IWU Department Mechatronics Dresden01187 Germany Technische Universität Chemnitz Department of Machine Tools and Forming Technology Chemnitz09107 Germany

In this paper we present an approach to reset a preload loss in ball screw drives which enables to compensate losses of positioning accuracy due to wear over lifetime. The main purposes are reduced maintenance, longer service life and improved workpiece quality by regenerating the desired preload conditions which leads to a higher profit for manufacturers. For this purpose, a novel shape memory alloy (SMA) bulk actuator module for ball screw drives is designed. The device is developed to be implemented in standard drives without major changes in component design. It is installed between flanged nut and counter nut and replaces a spacer usually needed to set a defined preload. To achieve the required actuator performance SMA bulk actuators are investigated in detail. This covers their basic design and activation concepts. A prototype is designed and experimentally investigated; measurements show the proof of the concept. © 2016

关键词： Ball screws Drives machine tools Rigidity Shape memory effect Actuator modules Actuator performance Ball screw drives Basic designs Component design Positioning accuracy Shape memory alloys(SMA) Wear compensation

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Composite sandwich with aluminum foam core and adhesive bonded carbon fiber reinforced thermoplastic cover layer

Composite sandwich with aluminum foam core and adhesive bond...

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International Symposium on Material Science and Engineering, ISMSE 2017

作者： Hackert, Alexander Drebenstedt, Claudia Timmel, Tristan Osiecki, Tomasz Kroll, Lothar Technische Universität Chemnitz Department of Lightweight Structures and Polymer Technology Institute of Lightweight Structures Faculty of Mechanical Engineering Chemnitz09107 Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Mechatronics and Lightweight Structures Reichenhainer Straße 88 Chemnitz09126 Germany

ISBN: (纸本)9783035711165

The combination of metals and fiber reinforced plastics is also known as hybrid metal composites. They offer the fusion of the good static mechanical properties of the fiber reinforced plastics and the good dynamic mechanical properties of the metal. For that reason, parts made of hybrid metal composites are predestined for the use as load relevant parts. The purpose of this study was to develop new technologies for semi finished hybrid metal composite materials. Thermoplastic Fiber-Reinforced Composites (TP-FRC) were arranged with new, isotropic, closed pore Aluminum Foam (AF) structures to an Extrinsically Combined Composite Sandwich (ECCS) by adhesive bonding. They form the basis for novel weight-optimized as well as cost-effective applications. The entire manufacturing process for the continuous semi-finished product was examined and verified according DIN EN 2563. This was done with regard to subsequent characterization by the specific bending modulus and specific bending stiffness. The examinations show a high bending stiffness and high strength structures combined with excellent damping properties at high damage tolerances. These are the most requested in automotive applications. © 2017 Trans Tech Publications, Switzerland.

关键词： Carbon fiber reinforced plastics

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Different encapsulation strategies for implanted electronics

Different encapsulation strategies for implanted electronics

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作者： Winkler, Sebastian Edelmann, Jan Welsch, Christine Ruff, Roman Fraunhofer Institute for Machine Tools and Forming Technology Reichenhainer Straße 88 Chemnitz09126 Germany Fraunhofer Institute for Biomedical Engineering IBMT Ensheimer Strasse 48 66386 St. Ingbert Germany

Recent advancements in implant technology include increasing application of electronic systems in the human body. Hermetic encapsulation of electronic components is necessary, specific implant functions and body environments must be considered. Additional functions such as wireless communication systems require specialized technical solutions for the encapsulation. In this paper 3 different implant strategies based on the material groups silicone, ceramics and titanium alloys are evaluated. With the background of a specific application the requirements for the encapsulation are defined and include the implementation of electrical feedthroughs, wireless communication and wireless energy transfer as well as biomedical specifications such as hermetic sealing, mechanical stability and biocompatibility. The encapsulations are manufactured and qualified experimentally. © 2017 Sebastian Winkler et al., Published by De Gruyter.

关键词： Silicones

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In-process monitoring of joining operations for piezoceramic elements 21st

In-process monitoring of joining operations for piezoceramic...

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21st Symposium on Composites, 2017

作者： Müller, Benedikt Pierer, Alexander Schmidt, Marek Schubert, Andreas Koriath, Hans-Joachim Putz, Matthias Wittstock, Volker Chemnitz University of Technology Prof. Micromanufacturing Technology Reichenhainer Str. 70 Chemnitz09126 Germany Fraunhofer Institute for Machine Tools and Forming Technology Reichenhainer Str. 88 Chemnitz09126 Germany Chemnitz University of Technology Prof. for Machine Tools and Forming Technology Reichenhainer Str. 70 Chemnitz09126 Germany

ISBN: (纸本)9783035711981

The direct integration of piezo elements into micro-structured aluminum sheets is a new approach for adaptronics and lightweight constructions. With the integration of the active piezoceramic elements the aluminum sheets gain sensor and actuator functionalities. The mechanical interconnections and the preload of the piezoceramic elements are an important issue for the sensor and actuator capability of the later smart material. Post-process inspection methods to characterize the mechanical interconnection of the joining partners and the performance of the transducer after the joining operation are state of the art. Scope of the research presented in this paper is the development of a novel in-process monitoring method that utilizes the piezoceramic transducer as inherent sensor for failure mode detection and preload evaluation during the joining by forming operation. Within this study, results of forming experiments with array batches of interconnected piezoceramic elements are presented. The piezoceramic batches are electrically contacted inside the joining tool and utilized as material inherent sensor during joining by forming experiments. Test samples are characterized by impedance spectroscopy during the joining operation. Based on the experimental results, a novel in-process-monitoring method utilizing the piezoceramic joining partners as inherent sensor is outlined. It is shown, that with this method a sufficient preload can be adjusted on the basis of the intensity of the resonance peak without an overload. Furthermore, error effects to the transducer can be detected at an early stage. © 2017 Trans Tech Publications, Switzerland.

关键词： Process monitoring

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Application of laser scanning as a Pre-machining metrology technique in Jet-ECM 17

Application of laser scanning as a Pre-machining metrology t...

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17th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2017

作者： Zanjani, Matin Yahyavi Zeidler, Henning Martin, André Schubert, Andreas Prof. Micromanufacturing Technology Faculty of Mechanical Engineering Technische Universität Chemnitz Chemnitz09107 Germany Fraunhofer Institute for Machine Tools and Forming Technology Chemnitz09126 Germany

ISBN: (纸本)9780995775107

In Electrochemical Machining (ECM), where the material removal takes place based on the anodic dissolution of the workpiece material, the working distance is one of the most important parameters. Especially in Jet Electrochemical Machining (Jet-ECM), where a micro nozzle is moved over the initial surface of the workpiece in order to apply an electrolytic free jet to produce the desired shapes, the distance between the nozzle and the workpiece becomes even more important. On the one hand a small working distance is aspired to achieve high current densities resulting in a high efficiency of the process. On the other hand the working distance needs to be large enough to avoid damages on the micro nozzle caused by electrical discharges or mechanical contact. Hence, the adjustment of the working gap is essential to realize a precise, effective and secure Jet-ECM process. The control of the gap size is done based on the data gathered before machining by surface measurement. Until now, the initial surface has been detected by electrostatic probing through moving the nozzle stepwise to the work piece surface and detect the voltage drop between the nozzle and the work piece. With this strategy, only a limited number of points can be detected within adequate time. Hence, in most cases only three points of the initial surface are detected in order to adjust the working distance according to the planar inclination of the workpiece. The coordinates of the three detected points are used to calculate the normal vector of the initial surface. In recent studies, another strategy was analysed, which is realized by dividing the surface into smaller areas and respectively calculating the normal vector of each area in order to obtain more accurate data of the initial surface. A further strategy is to use probing along the machining path of the tool and to gather the coordinates of a number of points along the path. The above mentioned methods usually do not ensure the precise control of

关键词： Surface analysis

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Process analysis for magnetic pulse welding of similar and dissimilar material sheet metal joints

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Procedia Engineering 2017年 207卷 353-358页

作者： Verena Psyk Christian Scheffler Maik Linnemann Dirk Landgrebe Fraunhofer Institute for Machine Tools and Forming Technology Reichenhainer Strasse 88 09126 Chemnitz Germany

Magnetic pulse welding (MPW) is an impact welding technology for producing metallic bonds of similar and dissimilar materials offering advantages such as avoidance of temperature induced problems. Based on the parameters describing the collision of the joining partners, specifically the impact angle and impact velocity, so-called welding windows describe whether or not welding will be successful for a specific material combination. However, as in MPW collision parameters depend on equipment and setup dependent parameters, using these welding windows for process design requires knowledge about the adjustment of the collision parameters via the adjustable process parameters. Therefore, the influence of adjustable process parameters on collision parameters and resulting weld quality is analyzed and trends, for a target oriented process and joint design, are deduced. Specifically, joining of copper to aluminum, copper to copper, aluminum to copper and aluminum to stainless steel is regarded.

关键词： Magnetic pulse welding Process analysis Multi-material joints

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Numerical simulation of thermal supported self-pierce riveting of an ultra high-strength aluminium alloy

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Journal of Physics: Conference Series 2018年第1期1063卷

作者： M Jäckel S Maul C Kraus W-G Drossel Fraunhofer Institute for Machine Tools and Forming Technology IWU Nöthnitzer Str. 44 01187 Dresden Germany

This paper will describe the experimental and numerical analysis of the thermal supported self-pierce riveting process of EN AW-6016 T4 into EN AW-7075 T6. In this regard, the experimental process analysis, the develo...

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