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Author :
Publisher :
ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (946 download)
Download or read book Numerical Simulation of the Filling Stage in the Micro-injection Molding Process written by and published by . This book was released on 2003 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (946 download)
Download or read book Numerical Simulation and Experimental Validation of the Filling Stage in the Co-injection Molding Process written by and published by . This book was released on 2003 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Rui Igreja
Publisher :
ISBN 13 : 9783656649243
Total Pages : 126 pages
Book Rating : 4.6/5 (492 download)
Download or read book Numerical Simulation of the Filling and Curing Stages in Reaction Injection Moulding written by Rui Igreja and published by . This book was released on 2014-05-13 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: Master's Thesis from the year 2007 in the subject Engineering - Mechanical Engineering, language: English, abstract: (Thesis in pdf available here: http: //goo.gl/EZzlT6 and here: http: //hdl.handle.net/10773/2419) Commonly used methods for injection moulding simulation involve a considerable number of simplifications, leading to a significant reduction of the computational effort but, in some cases also to limitations. In this work, Reaction Injection Moulding (RIM) simulations are performed with a minimum of simplifications, by using the general purpose CFD software package Ansys CFX, designed for numerical simulation of fluid flow and heat and mass transfer. The Ansys CFX's homogeneous multiphase flow model, which is generally considered to be the appropriate choice for modelling free surface flows where the phases are completely stratified and the interface is well defined, is shown to be unable to model the filling process correctly. This problem is overcome through the implementation of the inhomogeneous model in combination with the free-slip boundary condition for the air phase. The cure reaction is implemented in the code as a transport equation for an additional scalar variable, with a source term. Various transient and advection schemes are tested to determine which ones produce the most accurate results. Finally, the mass conservation, momentum, cure and energy equations are implemented all together to simulate the simultaneous filling and curing processes present in the RIM process. The obtained numerical results show a good global accuracy when compared with other available numerical and experimental results, though considerably long computation times are required to perform the simulations.
Author : Sang-Woo Kim
Publisher :
ISBN 13 :
Total Pages : 156 pages
Book Rating : 4.:/5 (89 download)
Download or read book Three-dimensional Simulations for the Filling Stage of the Polymer Injection Molding Process Using the Finite Element Method written by Sang-Woo Kim and published by . This book was released on 2005 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Homerus
Publisher :
ISBN 13 :
Total Pages : 205 pages
Book Rating : 4.:/5 (72 download)
Download or read book Homers Odyssee. Bd. 1. Gesang VII - XII written by Homerus and published by . This book was released on 1908 with total page 205 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 4 pages
Book Rating : 4.:/5 (946 download)
Download or read book Numerical Simulation of the Mould Filling Stage in Gas Assisted Injection Moulding written by and published by . This book was released on 1996 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : D. M. Gao
Publisher :
ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (355 download)
Download or read book Numerical Simulation of the Sequential Filling in Injection Molding Process written by D. M. Gao and published by . This book was released on 1994 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Cécile Jeggy
Publisher : Presses univ. de Louvain
ISBN 13 : 9782930344553
Total Pages : 296 pages
Book Rating : 4.3/5 (445 download)
Download or read book Micro-Injection Moulding written by Cécile Jeggy and published by Presses univ. de Louvain. This book was released on 2004 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: Micro-injection moulding is a new process, and as such it has not been thoroughly investigated until now. The peculiarities related to the three dimensional aspect of the cavity and the very small length and time scales at stake make it a very specific technology compared to conventional injection moulding. The aim of this thesis is to pave the way for micro-injection moulding modelling with a special emphasis on micro-cavity filling. Besides giving insight into the process, this work demonstrates the importance of visco-elastic effects and investigates further related issues. The different steps adopted in this work are the following ones: first an extensive review of the process is proposed, followed by a reflection on micro-cavity filling and polymer behaviour which ends up with the choice of the Giesekus model as an appropriate viscoelastic model for some polymers used in this process. A chapter dedicated to polymer characterization conducted on PC Lexan HF11110R, a micro-injection suited amorphous material, shows that the Newtonian viscosity is very low. In this case, the model admissibility from a mathematical and thermodynamic point of view is not guaranteed. This admissibility is the object of a chapter which provides an analysis for the Giesekus model completed with the PC Lexan material parameters. A further mathematical consequence of a vanishing Newtonian viscosity is that the number of inlet boundary conditions to be prescribed for the extra-stress tensor is reduced to 4 instead of 6 in case of a non-vanishing Newtonian viscosity. A specific numerical scheme to tackle this problem is proposed along with a theta-splitting based method which allows us to separate the viscous and visco-elastic effects in the governing equations and to treat subsequently a modified Stokes sub-problem and a transport sub-problem. Finally, a micromixer design and prototyping is presented as an application of this promising process.
Author : James L. Berger
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (115 download)
Download or read book A Numerical Simulation of the Cavity Filling Process in Injection Molding written by James L. Berger and published by . This book was released on 1972 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : M.S.J. Hashmi
Publisher : Elsevier
ISBN 13 : 0128032502
Total Pages : 1467 pages
Book Rating : 4.1/5 (28 download)
Download or read book Comprehensive Materials Finishing written by M.S.J. Hashmi and published by Elsevier. This book was released on 2016-08-29 with total page 1467 pages. Available in PDF, EPUB and Kindle. Book excerpt: Finish Manufacturing Processes are those final stage processing techniques which are deployed to bring a product to readiness for marketing and putting in service. Over recent decades a number of finish manufacturing processes have been newly developed by researchers and technologists. Many of these developments have been reported and illustrated in existing literature in a piecemeal manner or in relation only to specific applications. For the first time, Comprehensive Materials Finishing, Three Volume Set integrates a wide body of this knowledge and understanding into a single, comprehensive work. Containing a mixture of review articles, case studies and research findings resulting from R & D activities in industrial and academic domains, this reference work focuses on how some finish manufacturing processes are advantageous for a broad range of technologies. These include applicability, energy and technological costs as well as practicability of implementation. The work covers a wide range of materials such as ferrous, non-ferrous and polymeric materials. There are three main distinct types of finishing processes: Surface Treatment by which the properties of the material are modified without generally changing the physical dimensions of the surface; Finish Machining Processes by which a small layer of material is removed from the surface by various machining processes to render improved surface characteristics; and Surface Coating Processes by which the surface properties are improved by adding fine layer(s) of materials with superior surface characteristics. Each of these primary finishing processes is presented in its own volume for ease of use, making Comprehensive Materials Finishing an essential reference source for researchers and professionals at all career stages in academia and industry. Provides an interdisciplinary focus, allowing readers to become familiar with the broad range of uses for materials finishing Brings together all known research in materials finishing in a single reference for the first time Includes case studies that illustrate theory and show how it is applied in practice
Author : Hwai Hai Chiang
Publisher :
ISBN 13 :
Total Pages : 342 pages
Book Rating : 4.E/5 ( download)
Download or read book Simulation and Verification of Filling and Post-filling Stages of the Injection-molding Process written by Hwai Hai Chiang and published by . This book was released on 1989 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Liyong Yu
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (548 download)
Download or read book Experimental and Numerical Analysis of Injection Molding with Microfeatures written by Liyong Yu and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Injection molding has great potential for mass production of polymer products with microfeatures. In this study, injection molding with micro-features is investigated experimentally and numerically. Different methods were used to fabricate tool steel, photoresist and nickel mold inserts for injection molding with micro-features. Experiments have been conducted and analyzed for the radial flow case and the unidirectional flow case. Simulations based on 2.5D software packages for are preformed. Both numerical simulation and experimental results showed that the injection speed, feature width and mold temperature are important for mold filling. However, conventional midplane simulation is found to be inappropriate for multi-scale structures, typically found in micro-injection molded parts. For the unidirectional flow, an x-z planar simulation based on the general momentum equation is able to achieve better efficiency than 3D simulations. A hybrid numerical technique is developed, which can significantly reduce the computation cost, and yet provide good flow simulation around the microfeatures. The mold-melt heat transfer coefficient and injection speed are shown to be very important factors in determining the filling depth in microstructures. Different choices of the value of the constant heat transfer coefficient give very different results. Therefore, a local heat iii transfer model is collaborated in our code. It produces good prediction in our simulation. However, it may not include all effects. Wall-slip may also contributes to the filling length in microchannels. A decrease of the heat transfer coefficient and the occurrence of wall-slip are likely to occur in micro channels. Further investigations are needed.
Author : Sherikant P. Oak
Publisher :
ISBN 13 :
Total Pages : 188 pages
Book Rating : 4.:/5 (254 download)
Download or read book Theory and Verification of the Simulation of the Filling Stage in the Injection Molding Process written by Sherikant P. Oak and published by . This book was released on 1991 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : S Thomas
Publisher : Elsevier
ISBN 13 : 1845696425
Total Pages : 753 pages
Book Rating : 4.8/5 (456 download)
Download or read book Advances in Polymer Processing written by S Thomas and published by Elsevier. This book was released on 2009-05-30 with total page 753 pages. Available in PDF, EPUB and Kindle. Book excerpt: Processing techniques are critical to the performance of polymer products which are used in a wide range of industries. Advances in polymer processing: From macro- to nano- scales reviews the latest advances in polymer processing, techniques and materials. Part one reviews the fundamentals of polymer processing with chapters on rheology, materials and polymer extrusion. Part two then discusses advances in moulding technology with chapters on such topics as compression, rotational and blow moulding of polymers. Chapters in Part three review alternative processing technologies such as calendaring and coating, foam processing and radiation processing of polymers. Part four discusses micro and nano-technologies with coverage of themes such as processing of macro, micro and nanocomposites and processing of carbon nanotubes. The final section of the book addresses post-processing technologies with chapters on online monitoring and computer modelling as well as joining, machining, finishing and decorating of polymers. With is distinguished editors and team of international contributors, Advances in polymer processing: From macro- to nano- scales is an invaluable reference for engineers and academics concerned with polymer processing. Reviews the latest advances in polymer processing, techniques and materials analysing new challenges and opportunities Discusses the fundamentals of polymer processing considering the compounding and mixing of polymers as well as extrusion Assesses alternative processing technologies including calendaring and coating and thermoforming of polymers
Author : J.L. Berger
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (841 download)
Download or read book A NUMERICAL SIMULATION OF THE CAVITY FILLING PROCESS WITH PVC IN INJECTION MOLDING. written by J.L. Berger and published by . This book was released on 1972 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ji Tai Niu
Publisher : Trans Tech Publications Ltd
ISBN 13 : 3038131741
Total Pages : 1570 pages
Book Rating : 4.0/5 (381 download)
Download or read book Physical and Numerical Simulation of Materials Processing written by Ji Tai Niu and published by Trans Tech Publications Ltd. This book was released on 2008-04-08 with total page 1570 pages. Available in PDF, EPUB and Kindle. Book excerpt: This specialist work comprises 249 peer-reviewed papers on the Physical and Numerical Simulation of Materials Processing.
Author : Gabor Jüttner
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (119 download)
Download or read book Simulation of the Filling Process in Micro-Injection Moulding written by Gabor Jüttner and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
