Micro Injection Molding

Micro Injection Molding Author : Guido Tosello
Release : 2019-06-11
Publisher : Carl Hanser Verlag GmbH Co KG
ISBN : 1569907463
File Size : 66.61 MB
Format : PDF, ePub
Download : 265
Read : 1271

"Micro Injection Molding" meets the need for a dedicated book dealing exclusively with micro injection molding and overcoming the challenges of managing and processing polymer materials at ultra-small scales. Micro injection molding is the primary process for the mass production of polymer components with critical dimensions in the sub-millimeter range; however, it is not just a simple downscaling of conventional injection molding, and specific material-process-product interactions must be understood in order to achieve near zero-defect net-shape micro molded products. Micro molding is typically associated with ultra-high accuracy and superior process capabilities. Micro molded products have dimensional tolerances down to the single-digit micrometer range and surface finish with roughness from the sub-micrometer down to a few nanometers range. Micro and nano-structured tool surfaces are reproduced with very high replication fidelity onto the polymer products. Micro injection molding is highly suitable for the manufacture of multifunctional micro components such as micro implants, microfluidic systems, polymer micro optical elements, and micro mechanical systems. This book provides engineers, project managers, researchers, consultants, and other professionals involved in precision polymer processing and micro manufacturing with a comprehensive, up-to-date, and detailed treatment of the main topics related to micro molding, from material and process technology to tooling, to key-enabling technologies, and multimaterial process variations. Contents: • Part 1 – Polymer Materials and Process Micro Technology: micro injection molding machines technology; micro molding process monitoring and control; polymer materials structure and properties in micro injection molding parts; surface replication in micro injection molding • Part 2 – Tooling Technologies for Micro Mold Making: micro machining technologies for micro injection mold making; ultra-precision machining technologies for micro injection mold making; surface treatment of mold tools in micro injection molding • Part 3 – Micro Molding Key-Enabling Technologies: vacuum-assisted micro injection molding; modeling and simulation of micro injection molding; metrological quality assurance in micro injection molding; additive manufacturing for micro tooling and micro part rapid prototyping • Part 4 – Multimaterial Micro Processing: micro powder injection molding; multimaterial micro injection molding

Micro-Injection Moulding

Micro-Injection Moulding Author : Cécile Jeggy
Release : 2004
Publisher : Presses univ. de Louvain
ISBN : 9782930344553
File Size : 23.17 MB
Format : PDF, ePub
Download : 995
Read : 936

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.

Micro Injection Molding

Micro Injection Molding Author : Tosello Guido
Release : 2018
Publisher :
ISBN : 9781523120215
File Size : 55.11 MB
Format : PDF
Download : 296
Read : 879

Injection Molding

Injection Molding Author : Musa R. Kamal
Release : 2012-11-12
Publisher : Carl Hanser Verlag GmbH Co KG
ISBN : 3446433732
File Size : 50.88 MB
Format : PDF, Docs
Download : 951
Read : 723

This book attempts to survey the state of the science and technology of the injection molding process. It represents a comprehensive, balanced mix of practical and theoretical aspects for a wide range of injection molding applications. The authors of the 21 chapters are experts and leaders in their respective areas of specialization in the injection molding field. While it is not possible to cover all aspects of such a dynamic growing field, we hope that the reader will find sufficient information and background to become acquainted, at various levels of depth, with key components of the science and technology of injection molding. Contents: Injection Molding: Introduction and General Background Injection Molding Machines, Tools, and Processes The Plasticating System for Injection Molding Machines Non-Conventional Injection Molds Gas Assisted Injection Molding Water Injection Techniques (WIT) Flow Induced Fiber Micro-Structure in Injection Molding of Fiber Reinforced Materials Injection Foam Molding Powder Metal Injection Molding Micro Injection Molding Internal Visualization of Mold Cavity and Heating Cylinder Injection Molding Control Optimal Design for Injection Molding Development of Injection Molding Simulation Three-Dimensional Injection Molding Simulation Viscoelastic Instabilities in Injection Molding Evolution of Structural Hierarchy in Injection Molded Semicrystalline Polymers Modeling Aspects of Post-Filling Steps in Injection Molding Volumetric and Anisotropic Shrinkage in Injection Moldings of Thermoplastics Three-Dimensional Simulation of Gas-Assisted and Co-Injection Molding Processes Co-Injection Molding of Polymers

Microengineering of Metals and Ceramics, Part I

Microengineering of Metals and Ceramics, Part I Author : Henry Baltes
Release : 2008-09-26
Publisher : John Wiley & Sons
ISBN : 3527616942
File Size : 44.79 MB
Format : PDF, ePub, Mobi
Download : 905
Read : 930

Microstructures, electronics, nanotechnology - these vast fields of research are growing together as the size gap narrows and many different materials are combined. Current research, engineering sucesses and newly commercialized products hint at the immense innovative potentials and future applications that open up once mankind controls shape and function from the atomic level right up to the visible world without any gaps. In this volume, authors from three major competence centres for microengineering illustrate step by step the process from designing and simulating microcomponents of metallic and ceramic materials to replicating micro-scale components by injection molding.

Analysis and Prediction of Micro Injection Molding Part Using Moldflow Simulation Software

Analysis and Prediction of Micro Injection Molding Part Using Moldflow Simulation Software Author : Mohammad Farhan Othman
Release : 2012
Publisher :
ISBN :
File Size : 38.49 MB
Format : PDF
Download : 175
Read : 1028

The demands of micro injection molding parts has been increase tremendously that promote the potential of its huge markets in this new millennium. The complexity of producing micro injection molding parts is much higher compare to typical injection molding process. Normally, micro injection molding parts was produce by using specially built micro injection molding machine or modified conventional injection molding machine that suit the process of producing micro parts. However, micro injection molding parts can also be ejected in conventional injection molding process. The problem is the amount of plastic material wasted from the feed system design is always more than 90%. This is due because the size of conventional injection molding process biggest than micro injection molding process. But nowadays, that problem can be predicted earlier by using Moldflow simulation software analysis. Moldflow simulation software can be used to determine the best feed system design, predict possible molding defects and suggest optimum injection molding parameters. This project was conducted analyze and predict of micro injection molding part using Moldflow simulation software. The analysis is made for three different size of runner that is 4mm, 5mm and 6mm. For the melt temperature material at 230°C and mould at both sides is 50°C. The Moldflow results are barely different. From the result, we can determine the best of runner before fabrication process take place. This analysis may reduce miscellaneous cost. The comparison need to be undertaken. The analysis can tell the best fill time, injection pressure, shot weight, air traps, weld line, time to freeze, temperature at flow front, and etc. The analysis will determine that weather Moldflow is suitable for micro plastics or not.

Development of Mini Micro Injection Moulding Machine

Development of Mini Micro Injection Moulding Machine Author : Daelami Aminuddin
Release : 2012
Publisher :
ISBN :
File Size : 61.46 MB
Format : PDF, ePub, Mobi
Download : 212
Read : 610

The project is to develop a mini micro injection moulding machine. This study consists of three stages which are design concept, fabrication process, and assembly process of the mini micro injection molding that will capable to run similarly as the real industries conventional micro injection molding machine. For the design concepts, two to three injection molding mechanism is designed, compared and choose the best design that can match the requirement of the mini micro injection machine. After the design has been decided, fabrication process will take place. In this project, it is important to define and organize the best and fastest method that suitable to fabricate the machine. Assembly processes need to be done to complete the machine. It consist of assemble the two unit of injection machine which are injection unit and clamping unit. For the last stage, in order to test and function the machine, we need to make it capable to melt the resin plastic and the injection plunger can inject the molten plastic in to the mould cavity through the nozzle.

Microengineering of Metals and Ceramics, Part I

Microengineering of Metals and Ceramics, Part I Author : Henry Baltes
Release : 2005
Publisher : Wiley-VCH
ISBN : 9783527312085
File Size : 36.29 MB
Format : PDF, ePub, Docs
Download : 344
Read : 932

Microstructures, electronics, nanotechnology - these vast fields of research are growing together as the size gap narrows and many different materials are combined. Current research, engineering sucesses and newly commercialized products hint at the immense innovative potentials and future applications that open up once mankind controls shape and function from the atomic level right up to the visible world without any gaps. In this volume, authors from three major competence centres for microengineering illustrate step by step the process from designing and simulating microcomponents of metallic and ceramic materials to replicating micro-scale components by injection molding.

Experiment and Simulation of Micro Injection Molding and Microwave Sintering

Experiment and Simulation of Micro Injection Molding and Microwave Sintering Author : Jianjun Shi
Release : 2014
Publisher :
ISBN :
File Size : 66.60 MB
Format : PDF, Kindle
Download : 592
Read : 221

Powder Injection molding process consists off our main stages: feedstock preparation, injection molding, debinding and sintering. The thesis presents the research on two main aspects: micro injectionmolding and microwave sintering. The main contributions can be concluded in thefollowing four aspects: Modification and supplement of previous algorithm for the simulation ofinjection molding process; Evaluation and implementation of surface tension effect in simulation for micro injection; Microwave sintering experiments of compacts based on 17-4PH stainles ssteel; Realization of the microwave sintering simulation with the coupling of multi-physics,including the classic microwave heating, heat transfer, and the supplement of model for sintering densification of powder impacts.

Experimental and Numerical Analysis of Injection Molding with Microfeatures

Experimental and Numerical Analysis of Injection Molding with Microfeatures Author : Liyong Yu
Release : 2004
Publisher :
ISBN :
File Size : 68.48 MB
Format : PDF, Mobi
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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.

Microcellular Injection Molding

Microcellular Injection Molding Author : Jingyi Xu
Release : 2011-01-06
Publisher : John Wiley & Sons
ISBN : 1118057872
File Size : 87.50 MB
Format : PDF, Mobi
Download : 948
Read : 1146

This book presents the most important aspects of microcellular injection molding with applications for science and industry. The book includes: experimental rheology and pressure-volume-temperature (PVT) data for different gas materials at real injection molding conditions, new mathematical models, micrographs of rheological and thermodynamic phenomena, and the morphologies of microcellular foam made by injection molding. Further, the author proposes two stages of processing for microcellular injection molding, along with a methodology of systematic analysis for process optimization. This gives critical guidelines for quality and quantity analyses for processing and equipment design.