Inst. Werkzeugmaschinen und Fabrikbetrieb

280 Items

Recent Submissions
The Effects of HLAW Parameters for One Side T-Joints in 15 mm Thickness Naval Steel

Churiaque, Cristina ; Sánchez-Amaya, Jose Maria ; Porrúa-Lara, Manuel ; Gumenyuk, Andrey ; Rethmeier, Michael (2021-04-07)

The present contribution is the first research reporting full penetration HLAW joints in 15 mm thick EH36 steel butt T-welds with square grooves on 2F welding position by single-sided welding. The effects of welding parameters were investigated to increase the quality of the joints. Conditions leading to defect-free full penetration welds fulfilling naval regulations includes a laser power of 1...

Neural Network Hyperparameter Optimization for the Assisted Selection of Assembly Equipment

Hagemann, Simon ; Sünnetcioglu, Atakan ; Fahse, Tobias ; Stark, Rainer (2019-12-16)

The design of assembly systems has been mainly a manual task including activities such as gathering and analyzing product data, deriving the production process and assigning suitable manufacturing resources. Especially in the early phases of assembly system design in automotive industry, the complexity reaches a substantial level, caused by the increasing number of product variants and the decr...

Systematic Literature Review of System Models for Technical System Development

Schmidt, Marvin M. ; Zimmermann, Thomas C. ; Stark, Rainer (2021-03-28)

In Model-Based Systems Engineering (MBSE) there is yet no converged terminology. The term ‘system model’ is used in different contexts in literature. In this study we elaborated the definitions and usages of the term ‘system model’, to find a common definition. We analyzed 104 publications in depth for their usage and definition as well as their meta-data e.g., the publication year and publicat...

Efficient abrasive water jet milling for near-net-shape fabrication of difficult-to-cut materials

Uhlmann, Eckart ; Männel, Constantin ; Braun, Thomas (2020-10-02)

The utilization of materials with high strength to density ratio enables efficiency improvements and is therefore demanded for many applications, particularly in the aerospace and other mobility sectors. However, the machining of these typically difficult-to-cut materials poses a challenge for conventional manufacturing technologies due to the high tool wear. Abrasive water jet (AWJ) machining ...

Mechanical anisotropy of additively manufactured stainless steel 316L: An experimental and numerical study

Charmi, Amir ; Falkenberg, R. ; Ávila, L. ; Mohr, G. ; Sommer, K. ; Ulbricht, A. ; Sprengel, M. ; Saliwan Neumann, R. ; Skrotzki, B. ; Evans, A. (2020-08-28)

The underlying cause of mechanical anisotropy in additively manufactured (AM) parts is not yet fully understood and has been attributed to several different factors like microstructural defects, residual stresses, melt pool boundaries, crystallographic and morphological textures. To better understand the main contributing factor to the mechanical anisotropy of AM stainless steel 316L, bulk spec...

Effects on the distortion of Inconel 718 components along a hybrid laser-based additive manufacturing process chain using laser powder bed fusion and laser metal deposition

Uhlmann, Eckart ; Düchting, Jan ; Petrat, Torsten ; Krohmer, Erwin ; Graf, Benjamin ; Rethmeier, Michael (2021-02-17)

The combination of laser powder bed fusion (LPBF), known for its geometrical freedom and accuracy, and the nozzle-based laser metal deposition process (LMD), known for its high build-up rates, has great potential to reduce the additive manufacturing times for large metallic parts. For the industrial application of the LPBF-LMD hybrid process chain, it is necessary to investigate the influence o...

Analysis of influencing factors for the dressing process in double side face grinding

Uhlmann, Eckart ; Lichtschlag, Linus (2021-01-04)

In grinding, the design of the dressing process is an essential part of work preparation and restoration of the grinding wheel’s profile and cutting ability. In contrast to most grinding processes, the choice of dressing parameters in double face grinding with planetary kinematics has so far only been experience-based. As a consequence, the dressing process causes a higher degree of tool wear t...

Automatisierte Lebensdatenanalyse mittels der Weibull-Verteilung zur Instandhaltung von Triebwerken

Krämer, Jonathan (2021)

In der folgenden Bachelorarbeit werden die Möglichkeiten der Automatisierung der Lebensdatenanalyse untersucht. Im Besonderen soll ein Prozess der Instandhaltung der Firma Rolls-Royce Deutschland automatisiert werden. Hierfür werden grundsätzliche Informationen über die Analyse von Lebensdaten in der technischen Industrie herausgearbeitet. Anschließend wird die Analyse für den Beispielprozess h...

OPEN_NEXT – Deliverable 5.1: Open source sociotechnical design components

Hofer, Margit ; Voigt, Christian ; Gloß, Thomas Maximilian (2020-06)

Main area of this deliverable is the identification and description of socio-technical design areas. To do so, this deliverable includes responses of six paired interviews and findings are presented under four headings: social, technical and business perspectives as well as the involvement of citizens. Each section of findings is summarised with key points, which can serve as orientation when p...

Towards robust object detection and pose estimation as a service for manufacturing industries

Rudorfer, Martin (2021)

The growing trend towards high-mix and low-volume production demands more flexible and reconfigurable control for assembly systems. In unstructured or less structured environments, object detection and pose estimation is a key capability to enable industrial robotics applications such as grasping, handling and assembling. The integration and interconnectivity of such automation functions is fos...

OPEN_NEXT – Deliverable 5.2: First release of prototyping improvement logic (PIL)

Peters, Ina ; Hofer, Margit ; Voigt, Christian ; Gloß, Thomas Maximilian (2020-12)

As places of intersection between society and technology with great experience in community management and co-development practices, makerspaces can have a huge impact on open source (product) development projects (OSD) in the context of company-community collaboration (C3). As a source of an open source mind-set and as prototyping facilities, they can decrease the distance between the design p...

OPEN_NEXT – Deliverable 1.3: Open Source Development (OSD) Framework

Hassan, Mehera ; Gloß, Thomas Maximilian (2020-10-30)

This deliverable outlines the first version of the OPEN_NEXT Open Source Development (OSD) framework. A framework that presents the OSD journey which will be taken by the six Small and Medium-sized Enterprises (SMEs), the three maker spaces (referred to here as Labs) together with OPEN_NEXT research and practice partners. The journey aims at harnessing the promising potential of collaborative p...

Nanomechanical study of polycarbonate/boehmite nanoparticles/epoxy ternary composite and their interphases

Cano Murillo, Natalia ; Ghasem Zadeh Khorasani, Media ; Silbernagl, Dorothee ; Hahn, Marc Benjamin ; Hodoroaba, Vasile‐Dan ; Sturm, Heinz (2020-11-04)

Thermoplastic modified thermosets are of great interest especially due to their improved fracture toughness. Comparable enhancements have been achieved by adding different nanofillers including inorganic particles such as nanosized boehmite. Here, we present a nanomechanical study of two composite systems, the first comprising a polycarbonate (PC) layer in contact with epoxy resin (EP) and the ...

Influence of oscillating magnetic field on the keyhole stability in deep penetration laser beam welding

Üstündağ, Ömer ; Bakir, Nasim ; Gumenyuk, Andrey ; Rethmeier, Michael (2020-11-10)

The stability of the keyhole decreases for deep penetrated high-power laser beam welding. The keyhole tends to collapse with increasing laser power and e.g. keyhole induced porosity can occur. This study deals with the observation of the keyhole during high-power laser beam welding in partial penetration mode by means of a high-speed camera. A butt configuration of 25 mm thick structural steel ...

Human-aided artificial intelligence: Or, how to run large computations in human brains? Toward a media sociology of machine learning

Mühlhoff, Rainer (2019-11-06)

Today, artificial intelligence (AI), especially machine learning, is structurally dependent on human participation. Technologies such as deep learning (DL) leverage networked media infrastructures and human-machine interaction designs to harness users to provide training and verification data. The emergence of DL is therefore based on a fundamental socio-technological transformation of the rela...

Surface Finishing of Zirconium Dioxide with Abrasive Brushing Tools

Uhlmann, Eckart ; Hoyer, Anton (2020-12-21)

Brushing with bonded abrasives is a finishing process which can be used for the surface improvement of various materials. Since the machining mechanisms of abrasive brushing processes are still largely unknown and little predating research was done on brushing ceramic workpieces, within the scope of this work technological investigations were carried out on planar workpieces of MgO-PSZ (zirconi...

Preclinical In Vitro Assessment of Submicron-Scale Laser Surface Texturing on Ti6Al4V

Schweitzer, Luiz ; Cunha, Alexandre ; Pereira, Thiago ; Mika, Kerstin ; Botelho do Rego, Ana Maria ; Ferraria, Ana Maria ; Kieburg, Heinz ; Geissler, Sven ; Uhlmann, Eckart ; Schoon, Janosch (2020-11-25)

Loosening of orthodontic and orthopedic implants is a critical and common clinical problem. To minimize the numbers of revision surgeries due to peri-implant inflammation or insufficient osseointegration, developments of new implant manufacturing strategies are indicated. Ultrafast laser surface texturing is a promising contact-free technology to modify the physicochemical properties of surface...

Experimental Determination of the Emissivity of Powder Layers and Bulk Material in Laser Powder Bed Fusion Using Infrared Thermography and Thermocouples

Mohr, Gunther ; Nowakowski, Susanna ; Altenburg, Simon J. ; Maierhofer, Christiane ; Hilgenberg, Kai (2020-11-20)

Recording the temperature distribution of the layer under construction during laser powder bed fusion (L-PBF) is of utmost interest for a deep process understanding as well as for quality assurance and in situ monitoring means. While having a notable number of thermal monitoring approaches in additive manufacturing (AM), attempts at temperature calibration and emissivity determination are relat...

Software solutions for Life Data Analysis

Krämer, Jonathan (2020-12-07)

List of software solutions for automated Life Data Analysis. General information and features for life data analysis and especially automation capability are listed for every software. Studied software includes commercial solutions, freeware solutions and packages from different programming languages.

Systematic Literature Review—Effects of PSS on Sustainability Based on Use Case Assessments

Blüher, Till ; Riedelsheimer, Theresa ; Gogineni, Sonika ; Klemichen, Antje ; Stark, Rainer (2020-08-27)

Product-service systems (PSS) are often presented as an inherently sustainable business model. The argumentation is often based on theoretical considerations, which cite circular economy (CE) characteristics in PSS business models as an explanation. In this paper we examined to what extent positive and negative sustainability effects of PSS could actually be observed, based on use cases. For th...