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

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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Granulation of Extruded Plastic Wires – Influence of Tool Geometry and Process Parameters

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Procedia CIRP 2016年 46卷 135-138页

作者： Macario Cardone Matthias Putz Gerhard Schmidt Martin Dix Jürgen Friedrich Erich Stockmann 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 Gebr. Saacke GmbH & Co. KG 75181 Pforzheim Germany Reduction Engineering GmbH 70825 Korntal-Münchingen Germany

Granulators cut extruded elastomer wires in small pieces, which can be used as starting raw material for injection molding. This contribution investigates the most relevant parameters of process and tool geometry for the granulation technology, with the aim of improving process efficiency and granule quality. Fiber-reinforced PA and ABS plastics have been analyzed using a dedicated test bench and finite element simulations. High-speed camera and various sensors were used to investigate the cutting process. The considered geometrical and kinematic parameters have been varied within a broad range in order to determine optimum values.

关键词： Cutting tool Fiber reinforced plastic (FRP) Finite Element Method (FEM) Granulation

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Surface reproduction accuracy of holographic design features for machine components fabricated by a combination of TiN-physical vapour deposition and a specific subsequent galvanic process 16

Surface reproduction accuracy of holographic design features...

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

作者： Uhlmann, E. Oberschmidt, D. Frenzel, S. Polte, J. Matthiesen, J. Böge, M. Fraunhofer Institute for Production Systems and Design Technology IPK Germany Institute for Machine Tools and Factory Management IWF Technische Universität Berlin Germany HoloDimensions GmbH Germany Gebr. Böge Metallveredelungs GmbH Germany

ISBN: (纸本)9780956679086

Based on a combined plasma based and galvanic process, an ultra-hard surface structure embossing tool will be developed to stamp holographic design features for example in embossing roller for the print and packaging industry as well as dies for striking coins or machine components. The multilayer bond, respectively the mutual multilayer adhesion is investigated, discussed and supported by parameter studies and evaluated by adhesive tape tests. Comparative investigations pertaining to surface reproduction accuracy of holographic design features are carried out using arc evaporative physical vapour deposition (PVD) and magnetron sputtering. The physically deposited titanium nitride(TiN)-layers are compared by their particular layer composition quality, deposition rate N and layer adhesion. In summary, holographic structures can be replicated in hard coatings with high surface reproduction accuracy. In comparison to the Arc-PVD process, the highest accuracy can be reached by magnetron sputtering.

关键词： Titanium nitride

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Simulation-based Correction Approach for Thermo-elastic Workpiece Deformations During Milling Processes

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Procedia CIRP 2016年 46卷 103-106页

作者： J. Glänzel R. Herzog S. Ihlenfeldt A. Meyer R. Unger Fraunhofer Institut for Machine Tools and Forming Technology IWU Chemnitz Germany Technische Universität Chemnitz Chemnitz Germany Technische Universität Dresden Dresden Germany

Based on the method of adaptive finite elements (FEM) a correction approach has been considered to identify the influence of thermo-elastic workpiece deformations during the production process milling. The paper presents a simulation-based tolerance variation calculation of cutting paths, which is caused by the heat input of the machine tool. Therefore a mathematical method is developed to numerically depict the progress of the miller with different curves A(t), B(t) and C(t). These curves are used to map the state of the milling path during the production process as well as to compare the current workpiece contour and the target workpiece contour. The tool center point (TCP) correction results from mapping of time-dependent deformation fields from the FE simulation. The aim is, on the one hand, to make statements before the production about keeping the tolerance, and on the other hand, to derive other correction approaches for the adaption of the cutting path coordinates.

关键词： milling tolerancing material removal thermo-elastic adaptive FEM

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Target Systems and Decision-making to Increase Production Sustainability

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Procedia CIRP 2016年 48卷 34-39页

作者： Matthias Putz Uwe Götze Johannes Stoldt Enrico Franz Fraunhofer Institute for Machine Tools and Forming Technology IWU Reichenhainer Straße 88 09126 Chemnitz Germany Chair of Management Accounting and Control Technische Universität Chemnitz Professur BWL III 09107 Chemnitz Germany

Many industrial companies are trying to improve their operation's sustainability. However, these efforts towards change are usually governed by economic considerations. This serves to neglect or at least diminish the perceivable relevance of ecologic or social consequences for investigated alternatives. This paper discusses the implications of multi-criterial target systems which extend the scope of considerations beyond economics to support the realisation of proactive environmental strategies. A special focus is set on the definition of targets as well as decision-making in brown-field planning projects. The findings are applied in a simulation-based study on the parameterisation of an energy-sensitive production control strategy.

关键词： Target systems Brown-field planning projects Sustainability Energy-sensitive production strategy Multi-objective genetic algorithm NSGA-II

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Hot metal gas forming of titanium grade 2 bent tubes

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AIP Conference Proceedings 2017年第1期1896卷

作者： Alexander Paul Markus Werner Ricardo Trân Dirk Landgrebe 1Fraunhofer Institute for Machine Tools and Forming Technology Reichenhainer Straße 88 D-09126 Chemnitz Germany 2TU Bergakademie Freiberg Institute of Metal Forming Bernhard-von-Cotta-Straße 4 D-09599 Freiberg Germany

Within the framework of investigations, an exhaust gas component made of Titanium Grade 2 was produced by means of Hot Metal Gas forming (HMGF) at the fraunhofer IWU in Chemnitz, *** semi-finished products were two-fold bent, thermal joined, calibrated and pre-formed tubes. So far, a three-stage internal high-pressure forming process at room temperature plus two necessary intermediate heat treatments were used to produce the component. Due to its complexity as well as the limited forming ability of Titanium Grade 2 at room temperature an one step Hot Metal Gas forming was developed to replace the former procedure.

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A Framework for Information-driven Manufacturing

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Procedia CIRP 2016年 57卷 38-43页

作者： Marko Friedemann Thies Uwe Trapp Johannes Stoldt Tino Langer Matthias Putz Fraunhofer Institute for Machine Tools and Forming Technologies IWU Reichenhainer Straße 88 09126 Chemnitz Germany Robert Bosch GmbH Bexbacher Straße 72 66424 Homburg (Saar) Germany

Despite the ever increasing saturation of manufacturing with information and communication technologies, most collected data is only used for its original purpose. This limits the potential of this data because it is almost never analysed for more complex information. The SmARPro project aims to provide solutions for exposing equipment data, analysing linked data sources and bringing helpful information to the shop floor. This paper presents the underlying framework, which formalises the structure of the SmARPro system and provides the foundation of information-driven manufacturing. Its application is exemplified in a case study, in which traceability data is used for productivity analysis.

关键词： Manufacturing data SmARPro Industry 4.0 Information Overall equipment efficiency

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Improving Performance of Turn-milling by Controlling Forces and Thermally Induced Tool-center Point (TCP) Displacement

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Procedia CIRP 2016年 40卷 481-485页

作者： M. Putz S. Ihlenfeldt U. Karaguzel U. Semmler E. Budak M. Bakkal R. Wertheim Fraunhofer Institute for Machine Tools and Forming Technology IWU 09126 Chemnitz Germany Mechanical Engineering Department Istanbul Technical University 34437 Istanbul Turkey Faculty of Engineering and Natural Sciences Sabanci University 81474 Istanbul Turkey

Improving performance during fine turn-milling operations including accuracy and productivity requires controlling of the cutting forces and the thermally induced displacement of the cutting edge. The objective of this investigation is to determine the thermally induced displacement of TCP during turn-milling and to reduce this displacement by using pressurized cooled air. The forces and tool elongation simulated by FEM are compared to measured values. It was shown that the amount of tool elongation could be 40% of the depth of cut in fine turn-milling, and it is possible to predict the tool elongation by FEM. Furthermore, cooled air can reduce the tool elongation by 65%.

关键词： Thermal effects Machining Finite Element Method (FEM)

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Requirements for a process chain for manufacturing of piezoceramicaluminum sandwiches 20th

Requirements for a process chain for manufacturing of piezoc...

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20th Symposium on Composites, 2015

作者： Nestler, Matthias Hensel, Sebastian Drossel, Welf-Guntram Müller, Roland Fraunhofer Institute for Machine Tools and Forming Technology Reichenhainer Str. 88 Chemnitz09126 Germany

ISBN: (纸本)9783038355151

Lightweight solutions and functional integration become more and more important in different fields of industry. In order to achieve a sensor and actuator functionality of shaped sheet metal parts, today a generally manual application step of the piezomodule is necessary. This subsequent process is time consuming and leads to high costs. In earlier studies a method was presented allowing the fabrication of a formable compound with an integrated sensor and actuator functionality[1, 2]. The formability of the compound is achieved using a viscous adhesive, surrounding the piezomodule during the forming operation. The low viscosity of the adhesive allows a relative movement between the piezomodule and the sheet metals and drastically reduces the transfer of critical strains to the piezomodule. Curing of adhesive takes place after the forming operation. To improve the efficiency of the process chain an advanced adhesive system with robust application properties has to be used. Furthermore, the productivity of several fabrication steps and their sequence in the process chain have to be verified and improved. The paper presents the process chain designed for automated production of formable sandwich sheets with integrated piezomodules, including the production steps for the fabrication of the semi-finished part as well as the forming operation. Aiming on a good formability during the shaping operation and on a stiff connection between the piezomodule and the sheet metal in the finished sandwich part, one focus is set on the adhesive properties required during the different process steps. © (2015) Trans Tech Publications, Switzerland.

关键词： Actuators

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Extending the Scope of Future Learning Factories by Using Synergies Through an Interconnection of Sites and Process Chains

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Procedia CIRP 2016年 54卷 124-129页

作者： Max Weeber Christian Gebbe Max Lutter-Günther J. Böhner J. Glasschroeder R. Steinhilper G. Reinhart Fraunhofer Institute for Manufacturing Engineering and Automation IPA Project Group Process Innovation at Bayreuth University Universitaetsstrasse 30 D-95447 Bayreuth Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Project Group Resource-efficient Mechatronic Processing Machines Beim Glaspalast 5 D-86153 Augsburg Germany

Learning factories serve as platforms to disseminate research findings into industrial practice and to educate prospective engineers in hands-on courses. The number of competences which can be taught in learning factories is related with the number of available processes and machines. A larger number of machines enables for example comparisons between similar processes, the operation of longer process chains and generally speaking a broader curriculum. However, due to financial or space restrictions the investment in machines is often limited. In order to overcome this issue, the collaboration between learning factories through interconnection of process chains is proposed in this paper. A systematic method, by which possible interlinkages can be found, is presented and a case study of the interlinkage of two learning factories in Bayreuth and Augsburg is given.

关键词： Resource efficiency Learning Factory Networks Collaboration CFRP Additive Manufacturing Virtual Learning

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