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Application of Substructure Decoupling Techniques to Predict Mobile machine Tool Dynamics: Numerical Investigations

Procedia CIRP 2016年 46卷 537-540页

作者： Mohit Law Hendrik Rentzsch Steffen Ihlenfeldt Matthias Putz Indian Institute of Technology Kanpur India Fraunhofer Institute for Machine Tools and Forming Technology IWU Chemnitz 09126 Germany Institute of Machine Tools and Control Engineering Technische Universität Dresden Germany

In situ machining of large workpieces is made possible by moving mobile machines to workpiece locations. To guide and enhance on site machining performance, dynamics of the assembled system must be predicted beforehand. Beforehand prediction of assembled response requires dynamics of the mobile machine in its free-free configuration be coupled with response of base/workpiece measured at location. Since obtaining the free-free response of the machine is non-trivial, this paper presents a substructure decoupling scheme that instead extracts the machine's response from known dynamics of the machine mounted on a base, and from information of a substructural base system. Simulation driven investigations show the decoupling scheme to be robust even under the vagaries of measurement noise and changes in the residual substructural base system. Extracted dynamics of the machine can be subsequently synthesized with known dynamics of other bases/workpieces for a priori prediction of assembled dynamics to guide first-time-right on site machining.

关键词： Dynamics machine tool Simulation Mobile machine Substructure decoupling

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Investigation of the Time-invariance and Causality of a machine Tool for Performing Operational Modal Analysis

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Procedia CIRP 2016年 46卷 400-403页

作者： Matthias Putz Volker Wittstock Martin Kolouch Jan Berthold Technische Universität Chemnitz Professorship for Machine Tools and Forming Technology Reichenhainer Str. 70 09126 Chemnitz Germany Fraunhofer Institute for Machine Tools and Forming Technology (IWU) Reichenhainer Str. 88 09126 Chemnitz Germany

The dynamic behaviour of machine tools affects the work-piece quality and productivity. Generally, the difference between the dynamic properties at standstill and during machining is neglected by the commonly applied assessment methods for production systems. Operational modal analysis takes into account these cutting- and operation-dependent influences. However, operation conditions might cause violation of the common measurement assumptions regarding time-invariance and causality. The investigations consider the time-invariance by the measurement of frequency response functions over the working space including the evaluation of mode shapes. The causality is evaluated by dynamic measurements at TCP excited by feed motions.

关键词： machine tool Dynamics Operational modal analysis

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New microfluidic functionalities by nano- And micro-patterned moulds 16

New microfluidic functionalities by nano- And micro-patterne...

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16th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2016

作者： Edelmann, Jan Eckert, Udo Groß, Stefan Gründig, Bernd Wedig, Heiko Usov, Victor O'hara, Neal Scanlan, Declan Cross, Graham Fraunhofer Institute for Machine Tools and Forming Technology IWU Chemnitz Germany An EKF Diagnostics Company Senslab Gesellschaft zur Entwicklung und Herstellung bioelektrochemischer Sensoren mbH Leipzig Germany Adama Innovations Ltd. 13 Webworks Forster Street Galway Ireland

ISBN: (纸本)9780956679086

FaBiMed is a European project established to develop new manufacturing strategies for medical micro devices, using polymer replication in production of cost effective miniaturized micro and nanostructured components in biocompatible and functional materials. One demonstration line is dedicated to compact disposable lab-on-chip devices and requires micro and nano-structuring of the mould surface in order to change wetting characteristics of microfabricated devices and enable them with additional microfluidic functional features such as micro-channels or cell filters. Such features must be effectively replicated by hot-embossing (HE) or microinjection moulding (IM), at the same time avoiding time-dependent clogging by residual polymer, after multiple replication cycles. The paper describes the mould manufacturing process combining four sequential technologies as well as the replication results.

关键词： Microfluidics

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Condition Monitoring of Piezoceramic Fibers During Joining by forming

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Procedia technology 2016年 26卷 144-151页

作者： W.-G. Drossel V. Wittstock S. Hensel M. Schmidt Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Str. 88 09126 Chemnitz Germany Professorship for Adaptronics and Lightweight Design in Production Technische Universität Chemnitz 09107 Chemnitz Germany Professorship Machine Tools and Forming Technology Technische Universität Chemnitz 09107 Chemnitz Germany

Nowadays, piezoelectric transducers with sensor or actuator functionality are applied on the surface of components by bonding. New research activities enable a novel process chain for sensor integration in which piezoceramic fibers are integrated directly into the surface of metal sheets using joining by forming. Scope of the paper is to investigate a method for condition monitoring of the piezoceramic fibers during the joining process. Different test samples are prepared and studied by its inherent sensor function in terms of electrical impedance during various loads. As a result, a novel approach is presented for monitoring the preload status during the forming operation and detecting errors by electrical impedance spectroscopy. This method contributes to ensure a high-volume production.

关键词： piezoceramic fibers condition monitoring impedance spectroscopy joining by forming

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Modeling of Heat Fluxes During Machining and Their Effects on Thermal Deformation of the Cutting Tool

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Procedia CIRP 2016年 46卷 611-614页

作者： Matthias Putz Gerhard Schmidt Ulrich Semmler Christian Oppermann Michael Bräunig Umut Karagüzel Institute for Machine Tools and Production Processes Chemnitz University of Technology 09010 Chemnitz Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU 09126 Chemnitz Germany Mechanical Engineering Department Istanbul Technical University 34437 Istanbul Turkey

The heat fluxes generated by cutting processes lead to thermal deformations in the tools. Particularly, in precision machining it is essential to know the amount of the process heat and its distribution of heat fluxes into tool, workpiece and chips. This paper presents an extended methodology for the calculation of these heat fluxes in machining operations. Additionally, by comparison of experimental results with finite element simulations, the thermally caused tool center point (TCP) displacements in turn-milling operations are discussed. Furthermore, the influence of cooled air on TCP displacements is shown.

关键词： Machining Thermal Effects Process Heat Simulation Finite Element Method

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Agile Engineering in Mechatronic Education Interdisciplinary Development of a Mechatronic System using Scrum

Agile Engineering in Mechatronic Education Interdisciplinary...

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Europe-Asia Congress on Mechatronics

作者： Thorsten P. Klein Benny Drescher Gunther Reinhart Project Group Resource-efficient Mechatronic Processing Machines (RMV) Fraunhofer Institute for Machine Tools and Forming Technology (IWU) Beim Glaspalast 5 86153 Augsburg Thorsten Project Group Resource-efficient Mechatronic Processing Machines (RMV) Fraunhofer Institute for Machine Tools and Forming Technology (IWU) Beim Glaspalast 5 86153 Augsburg

ISBN: (纸本)9781509017881

Agile procedures (e.g. Scrum) are applied in software engineering increasingly. These procedures enhance interdisciplinary collaboration, improvements of lead times and reduction of development costs. Hence, latest research activities are transferring such flexible techniques into machinery and plant construction, in order to cope with the rising software integration into mechatronic modules. As agile procedures have been omitted in mechanical engineering yet, we introduce a novel concept of a learning platform about Agile Engineering. This paper presents the background and experiences of Agile Engineering as well as the setting, the results and first educational achievements within our academic courses.

关键词： Agility Scrum Mechatronics Lean Product Development Development Process Learning Platform

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Faster temperature control systems for hot embossing and injection molding 15

Faster temperature control systems for hot embossing and inj...

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15th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2015

作者： Edelmann, Jan Fraunhofer Institute for Machine Tools and Forming Technology IWU Chemnitz Germany

ISBN: (纸本)9780956679079

Research work aims to develop a fast, production suitable hot embossing technology including appropriate tool systems for low-cost and production-integrated manufacturing of high-precision microfluidic structures in polymer films. The implementation is demonstrated by structuring of microfluidic films for disposable diagnostic devices used in home-care and point-of-care applications. The approach focuses on the development and thermal design of a tool system for fast hot embossing on basis of a fast non isothermal process. Close contour tempering of the active parts is the core of this approach. Based on an industrial specification the paper will describe tempering strategy, design and simulation of the tool concept. Heat flux and heat capacities together with the power loss in the system are used for calculating the tempering cycle. Based on that, the setup of an optimized tool system consisting of heating elements and a refrigerant system is presented. The new tool concept is thermally characterized by thermocouple and infrared measurements. Furthermore the system was tested in a commercial hot embossing equipment to demonstrate the improvements. It could be shown that a cycle time between one and two minutes is possible, in comparison to cycle times of fifteen minutes in conventional hot embossing systems. Although the test system was not optimized so far, in the embossing tests all items were replicated correctly and the microfluidic function was ensured. The results of the research work are applicable also for the optimization of injection molding tool systems.

关键词： Microfluidics

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Investigation of Cooling and Lubrication Strategies for Machining High-temperature Alloys

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Procedia CIRP 2016年 41卷 835-840页

作者： Katja Busch Carsten Hochmuth Bernhard Pause Andrea Stoll Rafael Wertheim Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Straße 88 09126 Chemnitz Germany NILES – SIMMONS Industrieanlagen GmbH Zwickauer Straße 355 09117 Chemnitz Germany

Optimal and efficient machining of high-temperature alloys is one of the main goals set by the manufacturing technology today, taking into account the unique properties of these materials, the required performance and the process parameters. One of the most important parameters investigated and presented in this paper is the optimal cooling and lubrication strategy. The application of various hybrid cooling strategies such as high-pressure cooling, cryogenic cooling and aerosol dry lubrication offers the potential to extend profitability and energy efficiency as well as high performance and improved surface integrity. The paper introduces fundamental functions, cooling systems and relationships that characterize the efficient utilization on standard machine tools. Based on fundamental investigations conducted using high-temperature alloys with poor machinability such as Titanium alloy Ti6Al4 V and Inconel 718, relevant influencing parameters are derived and optimization options are presented for the cooling strategies.

关键词： Turning cryogenic machining high-pressure cooling

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Process Monitoring of Abrasive Waterjet Formation

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Procedia CIRP 2016年 46卷 43-46页

作者： M. Putz M. Dittrich M. Dix Technische Universität Chemnitz Institute for Machine Tools and Production Processes (IWP) Reichenhainer Str. 70 09126 Chemnitz Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Str. 88 09126 Chemnitz Germany

Difficult to machine materials require innovative processing solutions for a stable and high quality contouring process of complex forms. Abrasive waterjet cutting gains in importance due to the continuous development of novel high performance materials and multi-material components. A reliable process monitoring during the machining operation becomes essential to avoid waste production. However, the measurement of the process conditions during abrasive waterjet cutting is difficult based on the rough environment inside the machining zone. In this paper appropriate methods for in-process monitoring of the jet conditions, in particular the critical nozzle wear as well as other process output parameters are being tested, discussed and classified.

关键词： Waterjet machining In-process measurement Monitoring

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Characteristic Diagram Based Correction Algorithms for the Thermo-elastic Deformation of machine tools

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Procedia CIRP 2016年 41卷 801-805页

作者： Christian Naumann Ilka Riedel Steffen Ihlenfeldt Ulrich Priber Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Straße 88 09126 Chemnitz Germany Chemnitz University of Technology Department of Mathematics Reichenhainer Straße 41 09126 Chemnitz Germany

This paper presents a characteristic diagram based approach to the correction of thermally induced tool center point displacements of machine tools. The entire process from the introduction of the correction principle to the issues arising in the online capable application of this correction method will be discussed, with special focus on the improvement and optimization of the calculation, input selection and grid structures of the characteristic diagrams.

关键词： Thermal error machine tool Correction Tool center point Regression Temperature field Characteristic diagram Smoothed Grid Regression

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