TY - JOUR A1 - Abbas, Karim A1 - Hedwig, Lukas A1 - Balc, Nicolae A1 - Bremen, Sebastian T1 - Advanced FFF of PEEK: Infill strategies and material characteristics for rapid tooling JF - Polymers N2 - Traditional vulcanization mold manufacturing is complex, costly, and under pressure due to shorter product lifecycles and diverse variations. Additive manufacturing using Fused Filament Fabrication and high-performance polymers like PEEK offer a promising future in this industry. This study assesses the compressive strength of various infill structures (honeycomb, grid, triangle, cubic, and gyroid) when considering two distinct build directions (Z, XY) to enhance PEEK’s economic and resource efficiency in rapid tooling. A comparison with PETG samples shows the behavior of the infill strategies. Additionally, a proof of concept illustrates the application of a PEEK mold in vulcanization. A peak compressive strength of 135.6 MPa was attained in specimens that were 100% solid and subjected to thermal post-treatment. This corresponds to a 20% strength improvement in the Z direction. In terms of time and mechanical properties, the anisotropic grid and isotropic cubic infill have emerged for use in rapid tooling. Furthermore, the study highlights that reducing the layer thickness from 0.15 mm to 0.1 mm can result in a 15% strength increase. The study unveils the successful utilization of a room-temperature FFF-printed PEEK mold in vulcanization injection molding. The parameters and infill strategies identified in this research enable the resource-efficient FFF printing of PEEK without compromising its strength properties. Using PEEK in rapid tooling allows a cost reduction of up to 70% in tool production. KW - polyetheretherketone (PEEK) KW - rapid tooling KW - infill strategy KW - compression behavior KW - additive manufacturing KW - fused filament fabrication Y1 - 2023 U6 - http://dx.doi.org/10.3390/polym15214293 N1 - This article belongs to the Special Issue "Polymer Materials and Design Processes for Additively Manufactured Products" VL - 2023 IS - 15 PB - MDPI CY - Basel ER - TY - JOUR A1 - Kämper, Klaus-Peter A1 - Picard, A. A1 - Schütze, A. A1 - Wallach, D. T1 - Adopting the Foundry Concept of Semiconductor Fabrication on Educational Schemes and the Virtual Technology Lab (VTL). Picard, A.; Kämper, K.-P.; Schütze, A.; Wallach, D.; Walter, T. JF - Mst-News (2006) Y1 - 2006 SN - 0948-3128 SP - 15, 16 EP - u. 35 ER - TY - JOUR A1 - Gebhardt, Andreas A1 - Schmidt, Frank-Michael A1 - Hötter, Jan-Steffen A1 - Sokalla, Wolfgang A1 - Sokalla, Patrick T1 - Additive Manufacturing by selective laser melting the realizer desktop machine and its application for the dental industry JF - Physics Procedia Y1 - 2010 SN - 1875-3892 N1 - Laser Assisted Net Shape Engineering 6, Proceedings of the LANE 2010, Part 2 VL - 5 IS - 2 SP - 543 EP - 549 ER - TY - JOUR A1 - Fateri, Miranda A1 - Gebhardt, Andreas T1 - Additive manufactured mechanical disentanglement lock JF - RTejournal - Forum für Rapid Technologie Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:0009-2-42147 SN - 1614-0923 VL - 12 PB - Fachhochschule Aachen CY - Aachen ER - TY - JOUR A1 - Kämper, Klaus-Peter A1 - Döpper, J. A1 - Ehrfeld, W. A1 - Oberbeck, S. T1 - A self-filling low-cost membrane micropump JF - Proceedings : an investigation of micro structures, sensors, actuators, machines and systems / sponsored by the IEEE Robotics and Automation Society in cooperation with the ASME Dynamic Systems and Control Division Y1 - 1998 SN - 078034412X N1 - International Workshop on Micro-Electro-Mechanical Systems <11, 1998, Heidelberg> SP - 432 EP - 437 PB - IEEE Service Center CY - Piscataway, NJ ER - TY - JOUR A1 - Engemann, Heiko A1 - Cönen, Patrick A1 - Dawar, Harshal A1 - Du, Shengzhi A1 - Kallweit, Stephan T1 - A robot-assisted large-scale inspection of wind turbine blades in manufacturing using an autonomous mobile manipulator JF - Applied Sciences N2 - Wind energy represents the dominant share of renewable energies. The rotor blades of a wind turbine are typically made from composite material, which withstands high forces during rotation. The huge dimensions of the rotor blades complicate the inspection processes in manufacturing. The automation of inspection processes has a great potential to increase the overall productivity and to create a consistent reliable database for each individual rotor blade. The focus of this paper is set on the process of rotor blade inspection automation by utilizing an autonomous mobile manipulator. The main innovations include a novel path planning strategy for zone-based navigation, which enables an intuitive right-hand or left-hand driving behavior in a shared human–robot workspace. In addition, we introduce a new method for surface orthogonal motion planning in connection with large-scale structures. An overall execution strategy controls the navigation and manipulation processes of the long-running inspection task. The implemented concepts are evaluated in simulation and applied in a real-use case including the tip of a rotor blade form. KW - mobile manipulation KW - large-scale inspection KW - wind turbine production KW - autonomous navigation KW - surface-orthogonal path planning Y1 - 2021 U6 - http://dx.doi.org/10.3390/app11199271 SN - 2076-3417 N1 - Belongs to the Special Issue "Advances in Industrial Robotics and Intelligent Systems" VL - 11 IS - 19 SP - 1 EP - 22 PB - MDPI CY - Basel ER - TY - JOUR A1 - Pfaff, Raphael A1 - Enning, Manfred A1 - Sutter, Stefan T1 - A risk‑based approach to automatic brake tests for rail freight service: incident analysis and realisation concept JF - SN Applied Sciences N2 - This study reviews the practice of brake tests in freight railways, which is time consuming and not suitable to detect certain failure types. Public incident reports are analysed to derive a reasonable brake test hardware and communication architecture, which aims to provide automatic brake tests at lower cost than current solutions. The proposed solutions relies exclusively on brake pipe and brake cylinder pressure sensors, a brake release position switch as well as radio communication via standard protocols. The approach is embedded in the Wagon 4.0 concept, which is a holistic approach to a smart freight wagon. The reduction of manual processes yields a strong incentive due to high savings in manual labour and increased productivity. KW - Freight rail KW - Brake test KW - Incident analysis KW - Train composition KW - Brake set-up Y1 - 2022 U6 - http://dx.doi.org/10.1007/s42452-022-05007-x SN - 2523-3971 N1 - Corresponding author: Raphael Pfaff VL - 4 IS - 4 SP - 1 EP - 14 PB - Springer CY - Cham ER - TY - JOUR A1 - Enning, Manfred A1 - Hücker, Jan A1 - Jenayeh, Imad A1 - Rake, Heinrich T1 - A Parametric Identification Scheme for a Self-tuning Industrial Compact Controller - INTERKAMA 1999 / Hucker, Jan ; Jenayeh, Imad ; Enning, Manfred ; Rake, Heinrich Y1 - 1999 N1 - ISA TP99UN139 ; Proceedings ISA-Tech Conference, Düsseldorf 1999 ER - TY - JOUR A1 - Scheidweiler, Robert A1 - Triesch, Eberhard T1 - A note on the duality between matchings and vertex covers in balanced hypergraphs JF - Journal of Combinatorial Optimization N2 - We present a new Min-Max theorem for an optimization problem closely connected to matchings and vertex covers in balanced hypergraphs. The result generalizes Kőnig’s Theorem (Berge and Las Vergnas in Ann N Y Acad Sci 175:32–40, 1970; Fulkerson et al. in Math Progr Study 1:120–132, 1974) and Hall’s Theorem (Conforti et al. in Combinatorica 16:325–329, 1996) for balanced hypergraphs. KW - Hall’s Theorem KW - Koenig’s Theorem KW - Duality KW - Balanced hypergraph KW - Hypergraph KW - Vertex cover KW - Matching Y1 - 2016 U6 - http://dx.doi.org/10.1007/s10878-015-9887-5 SN - 1573-2886 N1 - Lehrstuhl II für Mathematik RWTH Aachen VL - 32 IS - 2 SP - 639 EP - 644 PB - Springer CY - Berlin ER - TY - JOUR A1 - Enning, Manfred A1 - Jenayeh, I. A1 - Müller, C. A1 - Kositza, N. T1 - A New Approach for Automating Shunting Processes in Marshalling Yards / Jenayeh, I.; Müller, C. ; Kositza, N. ; Enning, M. ; Rake, H. JF - Computational Engineering in Systems Applications : 2nd IMACS International Multiconference CESA'98; [abstracts; Nabeul-Hammamet, Tunisia, April 1 - 4, 1998] / ed. by Pierre Borne Y1 - 1998 SP - 338 EP - 343 PB - UCIS CY - Villeneuve d'Ascq ER -