The Experts below are selected from a list of 1941 Experts worldwide ranked by ideXlab platform
Haiqing Gong - One of the best experts on this subject based on the ideXlab platform.
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thermal analysis of layer formation in a stepless Rapid Prototyping Process
Applied Thermal Engineering, 2004Co-Authors: Wenbin Hong, Haiqing GongAbstract:This paper presents a thermal analysis of forming the top layer of a five-layer part made using a stepless Rapid Prototyping Process, which cures successive layers of liquid polymer through exposure to UV light. A computer model is created to simulate the kinetics of the UV light induced photo-polymerization; the heat transfer in the curing stage and the Process after UV curing have been established. A temperature profile in the UV curing was obtained through the simulation. It was found that temperature in the top layer rose very Rapidly upon exposure to the UV radiation, and reached the maximum point near 100 °C at the end of curing. After the UV lamp was turned off, the layer temperature dropped quickly to room temperature due to convection. An in situ 2D thermal imaging experiment was conducted to verify the simulation results. It showed that the modeling agreed well with the experimental results.
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Thermal analysis of layer formation in a stepless Rapid Prototyping Process
Applied Thermal Engineering, 2004Co-Authors: Wenbin Hong, Yong Tsui Lee, Haiqing GongAbstract:This paper presents a thermal analysis of forming the top layer of a five-layer part made using a stepless Rapid Prototyping Process, which cures successive layers of liquid polymer through exposure to UV light. A computer model is created to simulate the kinetics of the UV light induced photo-polymerization; the heat transfer in the curing stage and the Process after UV curing have been established. A temperature profile in the UV curing was obtained through the simulation. It was found that temperature in the top layer rose very Rapidly upon exposure to the UV radiation, and reached the maximum point near 100 °C at the end of curing. After the UV lamp was turned off, the layer temperature dropped quickly to room temperature due to convection. An in situ 2D thermal imaging experiment was conducted to verify the simulation results. It showed that the modeling agreed well with the experimental results. © 2003 Elsevier Ltd. All rights reserved.
Wenbin Hong - One of the best experts on this subject based on the ideXlab platform.
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thermal analysis of layer formation in a stepless Rapid Prototyping Process
Applied Thermal Engineering, 2004Co-Authors: Wenbin Hong, Haiqing GongAbstract:This paper presents a thermal analysis of forming the top layer of a five-layer part made using a stepless Rapid Prototyping Process, which cures successive layers of liquid polymer through exposure to UV light. A computer model is created to simulate the kinetics of the UV light induced photo-polymerization; the heat transfer in the curing stage and the Process after UV curing have been established. A temperature profile in the UV curing was obtained through the simulation. It was found that temperature in the top layer rose very Rapidly upon exposure to the UV radiation, and reached the maximum point near 100 °C at the end of curing. After the UV lamp was turned off, the layer temperature dropped quickly to room temperature due to convection. An in situ 2D thermal imaging experiment was conducted to verify the simulation results. It showed that the modeling agreed well with the experimental results.
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Thermal analysis of layer formation in a stepless Rapid Prototyping Process
Applied Thermal Engineering, 2004Co-Authors: Wenbin Hong, Yong Tsui Lee, Haiqing GongAbstract:This paper presents a thermal analysis of forming the top layer of a five-layer part made using a stepless Rapid Prototyping Process, which cures successive layers of liquid polymer through exposure to UV light. A computer model is created to simulate the kinetics of the UV light induced photo-polymerization; the heat transfer in the curing stage and the Process after UV curing have been established. A temperature profile in the UV curing was obtained through the simulation. It was found that temperature in the top layer rose very Rapidly upon exposure to the UV radiation, and reached the maximum point near 100 °C at the end of curing. After the UV lamp was turned off, the layer temperature dropped quickly to room temperature due to convection. An in situ 2D thermal imaging experiment was conducted to verify the simulation results. It showed that the modeling agreed well with the experimental results. © 2003 Elsevier Ltd. All rights reserved.
Regina Knitter - One of the best experts on this subject based on the ideXlab platform.
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Prototype manufacturing of ceramic microparts
2006Co-Authors: Werner Bauer, Regina Knitter, Marcus Mueller, Hans-joachim Ritzhaupt-kleisslAbstract:Current Rapid Prototyping (RP) methods are characterized by restrictions in resolution and material variety. Especially in the micrometer range there is still a lack of suited methods for the quick manufacturing of ceramic prototypes. A Rapid Prototyping Process Chain (RPPC) using LPIM, centrifugal casting or pressure-less hot molding and silicone rubber molds allows closing this gap. With this Process chain it is possible to produce ceramic microparts with full functionality from single prototypes to preliminary or small lot series cost-effectively and in short time.
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Development of a Ceramic Micro Heat Exchanger - Design, Construction, and Testing
2005Co-Authors: B. Alm, Regina Knitter, J. H. HausseltAbstract:This article presents the development of a ceramic micro heat exchanger. Starting from its geometrical design, results obtained from a simplified simulation of the heat exchanger efficiency will be given. The alumina microcomponents were manufactured by a Rapid Prototyping Process chain. Here, stereolithography was combined with a low-pressure injection molding Process for the Rapid and precise manufacturing of ceramic components down to the micrometer range. A micro heat exchanger, joined from sintered components using a glass solder, was applied as a prototype and checked for its performance at a system pressure of 8 bar.
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ceramic microfabrication by Rapid Prototyping Process chains
Sadhana-academy Proceedings in Engineering Sciences, 2003Co-Authors: Regina Knitter, Werner BauerAbstract:Fabrication of micropatterned ceramics or ceramic microparts make high demands on the precision and resolution of the moulding Process. As finishing of miniaturised or micropatterned ceramic components is nearly impossible, shaping has to be done by a replication step in the green, unfired state. To avoid high tooling costs in product development, a Rapid Prototyping Process chain has been established that enables Rapid manufacturing of ceramic microcomponents from functional models to small lot series within a short time. This Process chain combines the fast and inexpensive supply of master models by Rapid Prototyping with accurate and flexible ceramic manufacturing by low-pressure injection moulding. Besides proper feedstock preparation and sufficient small grain size, the quality of the final components is mainly influenced by the quality of the master model. Hence, the Rapid Prototyping method must be carefully selected to meet the requirements of the component to be fabricated.
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Ceramic microfabrication by Rapid Prototyping Process chains
2003Co-Authors: Regina Knitter, Werner BauerAbstract:The fabrication of micropatterned ceramics or ceramic microparts make high demands to the precision and resolution of the moulding Process. As the finishing of miniaturised or micropatterned ceramic components are nearly impossible, the shaping has to be done by a replication step in the green, unfired state. To avoid high tooling costs in product development, a Rapid Prototyping Process chain has been established that enables the Rapid manufacturing of ceramic microcomponents from functional models to small lot series within a short time. This Process chain combines the fast and inexpensive supply of master models by Rapid Prototyping with the accurate and flexible ceramic manufacturing by low-pressure injection moulding. Besides a proper feedstock preparation and a sufficient small grain size the quality of the final components is mainly influenced by the quality of the master model. Hence, the Rapid Prototyping method must be carefully selected to meet the requirements of the component to be fabricated.
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Microfabrication of ceramics by Rapid Prototyping Process chains
Journal of Mechanical Engineering Science, 2003Co-Authors: Regina Knitter, Werner Bauer, Dieter GöhringAbstract:Most shaping Processes for ceramics are based on a powder technological moulding Process using a negative mould and subsequent thermal compaction. Especially for prototypes and small-lot series of microcomponents, the outlay for moulds is the major costing factor. Therefore the use of Rapid Prototyping (RP) Processes can decisively reduce the costs and time in product development of ceramic microcomponents. By combining the high resolution of, for example, stereolithography as an inexpensive and fast supply for master models with the high ? exibility of low- pressure injection moulding, a Rapid Prototyping Process chain (RPPC) has been established for the fabrication of micropatterned ceramic components as functional models or pre-production lots. This RPPC proved to have a very high moulding precision and accuracy in the submillimetre range, but also enables the fabrication of components with outer dimensions of several centimetres. Different RP techniques were investigated with regard to their suitability to be used as master models in the replication chain. The quality of the master models turned out to be of decisive signi? cance for the quality and reproducibility of the ceramic mouldings.
Werner Bauer - One of the best experts on this subject based on the ideXlab platform.
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Prototype manufacturing of ceramic microparts
2006Co-Authors: Werner Bauer, Regina Knitter, Marcus Mueller, Hans-joachim Ritzhaupt-kleisslAbstract:Current Rapid Prototyping (RP) methods are characterized by restrictions in resolution and material variety. Especially in the micrometer range there is still a lack of suited methods for the quick manufacturing of ceramic prototypes. A Rapid Prototyping Process Chain (RPPC) using LPIM, centrifugal casting or pressure-less hot molding and silicone rubber molds allows closing this gap. With this Process chain it is possible to produce ceramic microparts with full functionality from single prototypes to preliminary or small lot series cost-effectively and in short time.
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ceramic microfabrication by Rapid Prototyping Process chains
Sadhana-academy Proceedings in Engineering Sciences, 2003Co-Authors: Regina Knitter, Werner BauerAbstract:Fabrication of micropatterned ceramics or ceramic microparts make high demands on the precision and resolution of the moulding Process. As finishing of miniaturised or micropatterned ceramic components is nearly impossible, shaping has to be done by a replication step in the green, unfired state. To avoid high tooling costs in product development, a Rapid Prototyping Process chain has been established that enables Rapid manufacturing of ceramic microcomponents from functional models to small lot series within a short time. This Process chain combines the fast and inexpensive supply of master models by Rapid Prototyping with accurate and flexible ceramic manufacturing by low-pressure injection moulding. Besides proper feedstock preparation and sufficient small grain size, the quality of the final components is mainly influenced by the quality of the master model. Hence, the Rapid Prototyping method must be carefully selected to meet the requirements of the component to be fabricated.
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Ceramic microfabrication by Rapid Prototyping Process chains
2003Co-Authors: Regina Knitter, Werner BauerAbstract:The fabrication of micropatterned ceramics or ceramic microparts make high demands to the precision and resolution of the moulding Process. As the finishing of miniaturised or micropatterned ceramic components are nearly impossible, the shaping has to be done by a replication step in the green, unfired state. To avoid high tooling costs in product development, a Rapid Prototyping Process chain has been established that enables the Rapid manufacturing of ceramic microcomponents from functional models to small lot series within a short time. This Process chain combines the fast and inexpensive supply of master models by Rapid Prototyping with the accurate and flexible ceramic manufacturing by low-pressure injection moulding. Besides a proper feedstock preparation and a sufficient small grain size the quality of the final components is mainly influenced by the quality of the master model. Hence, the Rapid Prototyping method must be carefully selected to meet the requirements of the component to be fabricated.
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Microfabrication of ceramics by Rapid Prototyping Process chains
Journal of Mechanical Engineering Science, 2003Co-Authors: Regina Knitter, Werner Bauer, Dieter GöhringAbstract:Most shaping Processes for ceramics are based on a powder technological moulding Process using a negative mould and subsequent thermal compaction. Especially for prototypes and small-lot series of microcomponents, the outlay for moulds is the major costing factor. Therefore the use of Rapid Prototyping (RP) Processes can decisively reduce the costs and time in product development of ceramic microcomponents. By combining the high resolution of, for example, stereolithography as an inexpensive and fast supply for master models with the high ? exibility of low- pressure injection moulding, a Rapid Prototyping Process chain (RPPC) has been established for the fabrication of micropatterned ceramic components as functional models or pre-production lots. This RPPC proved to have a very high moulding precision and accuracy in the submillimetre range, but also enables the fabrication of components with outer dimensions of several centimetres. Different RP techniques were investigated with regard to their suitability to be used as master models in the replication chain. The quality of the master models turned out to be of decisive signi? cance for the quality and reproducibility of the ceramic mouldings.
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microfabrication of ceramics by Rapid Prototyping Process chains
Proceedings of the Institution of Mechanical Engineers. Part C Journal of mechanical engineering science, 2003Co-Authors: Regina Knitter, Werner Bauer, Daniel GöhringAbstract:AbstractMost shaping Processes for ceramics are based on a powder technological moulding Process using a negative mould and subsequent thermal compaction. Especially for prototypes and small-lot series of microcomponents, the outlay for moulds is the major costing factor. Therefore the use of Rapid Prototyping (RP) Processes can decisively reduce the costs and time in product development of ceramic microcomponents. By combining the high resolution of, for example, stereolithography as an inexpensive and fast supply for master models with the high flexibility of low-pressure injection moulding, a Rapid Prototyping Process chain (RPPC) has been established for the fabrication of micropatterned ceramic components as functional models or pre-production lots. This RPPC proved to have a very high moulding precision and accuracy in the submillimetre range, but also enables the fabrication of components with outer dimensions of several centimetres. Different RP techniques were investigated with regard to their su...
W. Q. Song - One of the best experts on this subject based on the ideXlab platform.
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thermal characteristics of a new metal polymer material for fdm Rapid Prototyping Process
Assembly Automation, 2005Co-Authors: Syed Hasan Masood, W. Q. SongAbstract:Purpose – Presents development and characterisation of a new metal/polymer composite material for use in fused deposition modelling (FDM) Rapid Prototyping Process with the aim of application to direct Rapid tooling. The work represents a major development in reducing the cost and time in Rapid tooling.Design/methodology/approach – The material consists of iron particles in a nylon type matrix. The detailed formulation and characterisation of the thermal properties of the various combinations of the new composites are investigated experimentally. Results are compared with other metal/polymer composites used in Rapid tooling.Findings – The feedstock filaments of this composite have been produced and used successfully in the unmodified FDM system for direct Rapid tooling of injection moulding inserts. Thermal properties are found to be acceptable for Rapid tooling applications for injection moulding.Originality/value – Introduces an entirely new metal based composite material for direct Rapid tooling applic...
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thermal characteristics of a new metal polymer material for fdm Rapid Prototyping Process
Assembly Automation, 2005Co-Authors: Syed Hasan Masood, W. Q. SongAbstract:– Presents development and characterisation of a new metal/polymer composite material for use in fused deposition modelling (FDM) Rapid Prototyping Process with the aim of application to direct Rapid tooling. The work represents a major development in reducing the cost and time in Rapid tooling., – The material consists of iron particles in a nylon type matrix. The detailed formulation and characterisation of the thermal properties of the various combinations of the new composites are investigated experimentally. Results are compared with other metal/polymer composites used in Rapid tooling., – The feedstock filaments of this composite have been produced and used successfully in the unmodified FDM system for direct Rapid tooling of injection moulding inserts. Thermal properties are found to be acceptable for Rapid tooling applications for injection moulding., – Introduces an entirely new metal based composite material for direct Rapid tooling application using FDM RP system with desired thermal properties and characteristics. This will reduce the cost and time of manufacturing tooling inserts and dies for injection moulding.
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Thermal characteristics of a new metal/polymer material for FDM Rapid Prototyping Process
Assembly Automation, 2005Co-Authors: Syed Hasan Masood, W. Q. SongAbstract:– Presents development and characterisation of a new metal/polymer composite material for use in fused deposition modelling (FDM) Rapid Prototyping Process with the aim of application to direct Rapid tooling. The work represents a major development in reducing the cost and time in Rapid tooling., – The material consists of iron particles in a nylon type matrix. The detailed formulation and characterisation of the thermal properties of the various combinations of the new composites are investigated experimentally. Results are compared with other metal/polymer composites used in Rapid tooling., – The feedstock filaments of this composite have been produced and used successfully in the unmodified FDM system for direct Rapid tooling of injection moulding inserts. Thermal properties are found to be acceptable for Rapid tooling applications for injection moulding., – Introduces an entirely new metal based composite material for direct Rapid tooling application using FDM RP system with desired thermal properties and characteristics. This will reduce the cost and time of manufacturing tooling inserts and dies for injection moulding.
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Thermal characteristics of a new metal/polymer material for FDM Rapid Prototyping Process
Assembly Automation, 2005Co-Authors: Syed Hasan Masood, W. Q. SongAbstract:Purpose – Presents development and characterisation of a new metal/polymer composite material for use in fused deposition modelling (FDM) Rapid Prototyping Process with the aim of application to direct Rapid tooling. The work represents a major development in reducing the cost and time in Rapid tooling.Design/methodology/approach – The material consists of iron particles in a nylon type matrix. The detailed formulation and characterisation of the thermal properties of the various combinations of the new composites are investigated experimentally. Results are compared with other metal/polymer composites used in Rapid tooling.Findings – The feedstock filaments of this composite have been produced and used successfully in the unmodified FDM system for direct Rapid tooling of injection moulding inserts. Thermal properties are found to be acceptable for Rapid tooling applications for injection moulding.Originality/value – Introduces an entirely new metal based composite material for direct Rapid tooling applic...
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Assembly Automation Thermal characteristics of a new metal/polymer material for FDM Rapid Prototyping Process Thermal characteristics of a new metal/polymer material for FDM Rapid Prototyping Process
Assembly Automation Rapid Prototyping Journal Iss Rapid Prototyping Journal, 2002Co-Authors: Syed Hasan Masood, W. Q. SongAbstract:Access to this document was granted through an Emerald subscription provided by emerald-srm:277515 [] For Authors If you would like to write for this, or any other Emerald publication, then please use our Emerald for Authors service information about how to choose which publication to write for and submission guidelines are available for all. Please visit www.emeraldinsight.com/authors for more information. About Emerald www.emeraldinsight.com Emerald is a global publisher linking research and practice to the benefit of society. The company manages a portfolio of more than 290 journals and over 2,350 books and book series volumes, as well as providing an extensive range of online products and additional customer resources and services. Emerald is both COUNTER 4 and TRANSFER compliant. The organization is a partner of the Committee on Publication Ethics (COPE) and also works with Portico and the LOCKSS initiative for digital archive preservation. Abstract Purpose – Presents development and characterisation of a new metal/polymer composite material for use in fused deposition modelling (FDM) Rapid Prototyping Process with the aim of application to direct Rapid tooling. The work represents a major development in reducing the cost and time in Rapid tooling. Design/methodology/approach – The material consists of iron particles in a nylon type matrix. The detailed formulation and characterisation of the thermal properties of the various combinations of the new composites are investigated experimentally. Results are compared with other metal/polymer composites used in Rapid tooling. Findings – The feedstock filaments of this composite have been produced and used successfully in the unmodified FDM system for direct Rapid tooling of injection moulding inserts. Thermal properties are found to be acceptable for Rapid tooling applications for injection moulding. Originality/value – Introduces an entirely new metal based composite material for direct Rapid tooling application using FDM RP system with desired thermal properties and characteristics. This will reduce the cost and time of manufacturing tooling inserts and dies for injection moulding.
