The Experts below are selected from a list of 309684 Experts worldwide ranked by ideXlab platform
Kirsten Honnef - One of the best experts on this subject based on the ideXlab platform.
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Process Chain development for the realization of zirconia microparts using composite reaction molding
Ceramics International, 2009Co-Authors: Thomas Hanemann, Kirsten HonnefAbstract:Composite reaction molding as rapid prototyping technique using polymer-based reactive resins and suitable inorganic fillers enables the realization of ceramic parts carrying a microstructured surface relief. In this paper the development of the whole Process Chain starting with feedstock preparation and characterization, molding and thermal postProcessing like debinding and sintering will be described for the fabrication of dense zirconia parts. Especially the rheological behaviour as function of the binder composition and solid load is discussed intensely. Specific feedstock parameters like critical filler load and flow activation energy are derived from the measured flow properties using empirical descriptions normally applied for feedstock systems established in powder injection molding.
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Process Chain development for the rapid prototyping of microstructured polymer, ceramic and metal parts: composite flow behaviour optimisation, replication via reaction moulding and thermal postProcessing
International Journal of Advanced Manufacturing Technology, 2007Co-Authors: Thomas Hanemann, Kirsten Honnef, J. H. HausseltAbstract:Different variants of reaction moulding techniques exploiting the rapid light-induced photopolymerisation of reactive resins are widely used in microsystem technologies for the fabrication of plastic components or for rapid prototyping (RP) purposes. In this paper, the further development of micro reaction moulding with respect to a rapid prototyping of ceramic and metal parts will be described. As in powder injection moulding, the, Process sequence binder-filler-formulation, replication, debinding and sintering has to be passed. The mould filling and, hence, the accurate reproduction of surface details depend strongly on the composite's viscosity, which is a function of the filler load. Especially, an improved Process control of the composite formation prior to moulding and the thermal debinding is crucial for the realisation of microstructured ceramic or metal parts. The development of the whole Process Chain and some examples will be presented.
Muhammad Rashid - One of the best experts on this subject based on the ideXlab platform.
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event driven Process Chain for modeling and verification of business requirements a systematic literature review
IEEE Access, 2018Co-Authors: Anam Amjad, Farooque Azam, Muhammad Waseem Anwar, Wasi Haider Butt, Muhammad RashidAbstract:Automation of any business Process primarily requires the identification of clear and precise requirements. However, the initially collected business requirements are usually expressed in natural language that creates ambiguities among different stakeholders. To overcome this problem, various business Process modeling languages (BPMLs) have been introduced to represent the business requirements graphically. In this context, event-driven Process Chain (EPC) is a well-known BPML that supports the modeling and verification of business requirements in early automation phases. Although EPC is frequently researched to improve its modeling and verification capabilities, there is no study available yet to the best of our knowledge that examines and summarizes the latest EPC developments. Therefore, in this article, we comprehensively investigate the latest EPC approaches, trends, and tools for the modeling and verification of business requirements. Particularly, a systematic literature review is carried out to select and analyze 73 research studies published during 1998–2017. Consequently, the selected studies are classified into six categories, i.e., modeling (14), transformation (13), verification (17), general (20), semantics (5), and requirement (4). Moreover, latest EPC modeling approaches are identified and analyzed, i.e., UML (2), meta-model (3), integration (5), and EPC notations (4). Furthermore, EPC verification methods are also investigated, i.e., EPC (6), petri-nets (8), and other languages (3). Finally, 25 leading EPC tools have been presented, i.e., existing tools (14), proposed/developed tools, (5) and additional tools (6). It has been concluded that EPC provides adequate approaches and tool support for the modeling and verification of simple business requirements through atomic events. However, the complex business requirements cannot be modeled and verified through EPC due to the lack of complex event Processing. Consequently, there is a strong need to include the support for the modeling and verification of complex events in EPC to manage multifaceted business requirements.
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event driven Process Chain for modeling and verification of business requirements a systematic literature review
IEEE Access, 2018Co-Authors: Anam Amjad, Farooque Azam, Muhammad Waseem Anwar, Wasi Haider Butt, Muhammad RashidAbstract:Automation of any business Process primarily requires the identification of clear and precise requirements. However, the initially collected business requirements are usually expressed in natural language that creates ambiguities among different stakeholders. To overcome this problem, various business Process modeling languages (BPMLs) have been introduced to represent the business requirements graphically. In this context, event-driven Process Chain (EPC) is a well-known BPML that supports the modeling and verification of business requirements in early automation phases. Although EPC is frequently researched to improve its modeling and verification capabilities, there is no study available yet to the best of our knowledge that examines and summarizes the latest EPC developments. Therefore, in this article, we comprehensively investigate the latest EPC approaches, trends, and tools for the modeling and verification of business requirements. Particularly, a systematic literature review is carried out to select and analyze 73 research studies published during 1998–2017. Consequently, the selected studies are classified into six categories, i.e., modeling (14), transformation (13), verification (17), general (20), semantics (5), and requirement (4). Moreover, latest EPC modeling approaches are identified and analyzed, i.e., UML (2), meta-model (3), integration (5), and EPC notations (4). Furthermore, EPC verification methods are also investigated, i.e., EPC (6), petri-nets (8), and other languages (3). Finally, 25 leading EPC tools have been presented, i.e., existing tools (14), proposed/developed tools, (5) and additional tools (6). It has been concluded that EPC provides adequate approaches and tool support for the modeling and verification of simple business requirements through atomic events. However, the complex business requirements cannot be modeled and verified through EPC due to the lack of complex event Processing. Consequently, there is a strong need to include the support for the modeling and verification of complex events in EPC to manage multifaceted business requirements.
Thomas Hanemann - One of the best experts on this subject based on the ideXlab platform.
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Process Chain development for the realization of zirconia microparts using composite reaction molding
Ceramics International, 2009Co-Authors: Thomas Hanemann, Kirsten HonnefAbstract:Composite reaction molding as rapid prototyping technique using polymer-based reactive resins and suitable inorganic fillers enables the realization of ceramic parts carrying a microstructured surface relief. In this paper the development of the whole Process Chain starting with feedstock preparation and characterization, molding and thermal postProcessing like debinding and sintering will be described for the fabrication of dense zirconia parts. Especially the rheological behaviour as function of the binder composition and solid load is discussed intensely. Specific feedstock parameters like critical filler load and flow activation energy are derived from the measured flow properties using empirical descriptions normally applied for feedstock systems established in powder injection molding.
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Process Chain development for the rapid prototyping of microstructured polymer, ceramic and metal parts: composite flow behaviour optimisation, replication via reaction moulding and thermal postProcessing
International Journal of Advanced Manufacturing Technology, 2007Co-Authors: Thomas Hanemann, Kirsten Honnef, J. H. HausseltAbstract:Different variants of reaction moulding techniques exploiting the rapid light-induced photopolymerisation of reactive resins are widely used in microsystem technologies for the fabrication of plastic components or for rapid prototyping (RP) purposes. In this paper, the further development of micro reaction moulding with respect to a rapid prototyping of ceramic and metal parts will be described. As in powder injection moulding, the, Process sequence binder-filler-formulation, replication, debinding and sintering has to be passed. The mould filling and, hence, the accurate reproduction of surface details depend strongly on the composite's viscosity, which is a function of the filler load. Especially, an improved Process control of the composite formation prior to moulding and the thermal debinding is crucial for the realisation of microstructured ceramic or metal parts. The development of the whole Process Chain and some examples will be presented.
Peter Groche - One of the best experts on this subject based on the ideXlab platform.
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blanking bending Process Chain with disturbance feed forward and closed loop control
Journal of Manufacturing Processes, 2016Co-Authors: Peter Groche, Florian Hoppe, Daniel Hesse, Stefan CalmanoAbstract:Abstract Bending and other manufacturing Processes are subject to uncertain Process conditions like varying properties of the semi-finished parts. In order to obtain precise bending angles, these variations have to be compensated. Upstream Processes often deliver valuable information about the actual part properties. This paper presents a blanking-bending Process Chain in which information from the blanking Process is passed on to the bending Process. A feed-forward bending controller uses this information as input state and compensates deviations from the nominal state. In a second instance, a closed-loop controller addresses model uncertainty of the feed-forward controller as well as unknown disturbances. A model-based closed-loop control design is shown which increases stability, stationary accuracy and time-optimality.
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Development of manufacturing Process Chains considering uncertainty
Enabling Manufacturing Competitiveness and Economic Sustainability, 2011Co-Authors: Sebastian O. Schmitt, Jörg Avemann, Peter GrocheAbstract:The production Processes of forming companies are traditionally characterized by a high productivity. Process Chains are developed with regard to cost efficiency for a predefined lot size. However, the accordingly determined optimal Process Chain might become inferior against the background of a changing company environment. This paper presents a feature-based methodology for the development of production Process Chains considering changeable company environments. A classification of influences on production Processes is developed which allows the deduction of scenarios describing the interrelation between causes of change and companies‘ decision making criteria. Based on the value of the possibility to change or expand a Process Chain can be determined. The method is applied using the Process Chain planning for a particulate filter as an example.
Regina Knitter - One of the best experts on this subject based on the ideXlab platform.
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Development of a rapid prototyping Process Chain for the production of ceramic microcomponents
Journal of Materials Science, 2002Co-Authors: Werner Bauer, Regina KnitterAbstract:Cost-intensive and time-consuming manufacturing of new miniaturized or micropatterned ceramic components may profit decisively from the use of rapid prototyping Processes. However most known generative Processes do not provide a sufficient resolution for the fabrication of microdimensional or micropatterned components or are restricted to polymer materials. In contrast to this, a rapid prototyping Process Chain (RPPC), which combines e.g., micro stereolithography and a low-pressure shaping method using soft molds, allows the rapid manufacturing of ceramic microcomponents from functional models to preliminary or small lot series.
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manufacturing of ceramic microcomponents by a rapid prototyping Process Chain
Advanced Engineering Materials, 2001Co-Authors: Regina Knitter, Daniel Göhring, Werner Bauer, J HauseltAbstract:Time-intensive and cost-consuming manufacturing of new ceramic components may be improved significantly by the use of rapid prototyping Processes especially in the development of miniaturized or micropatterned components. Their molding is generally very expensive and finishing is difficult to the point of impossibility. Most known generative ceramic molding Processes do not provide a sufficient resolution for the fabrication of microstructured components. In contrast to this, a rapid prototyping Process Chain that combines micro-stereolithography and low-pressure injection molding, for example, allows the rapid manufacturing of ceramic microcomponents from functional models to preliminary or small-lot series, microcomponents from functional models to preliminary or small-lot series.
