Download or read book Investigation of Injection Molding Process for High Precision Polymer Lens Manufacturing written by Chunning Huang and published by . This book was released on 2008 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Injection molding polymer optical components have long been used for its high volume, low cost and lightweight capability over traditional glass optics. However, the process has not been readily accepted in precision optical fabrication industry because several difficult issues such as geometry deviation, inhomogeneous index distribution, birefringence and freeform fabrication have hindered the implementation of injection molding process in high precision optical applications. This dissertation research was an attempt to create a methodology for injection molding process for high precision polymer lens manufacturing. The study included both experimental approach and numerical modeling in order to identify the proper polymer lens manufacturing processes. The scope of this research involved in both fundamental and systematic investigation in optical design, mold and lens fabrication, as well as optical metrology issues related to polymer lens manufacturing to obtain precision macro and micro polymer freeform optics with accurate geometry and proper optical performance by the state-of-the-art mold fabrication and molding technology. With the aid of DOE (design of experiment) and DEA (data envelopment analysis) methods, the critical process parameters were narrowed down and the optimal conditions were determined for lens geometry compensation. The mold compensation methodology was developed based on advanced freeform measurement and data analysis technology and slow tool servo freeform mold fabrication. The effects of the process parameters on optical performance such as birefringence, index distribution and surface scattering were carefully studied by theoretical and empirical analysis. Due to the complexity of the injection molding process, single process condition cannot fulfill all the requirements for lens quality, therefore balanced process parameters need to be selected as a compromise for desired specifications. Moreover, fabrication of macro Alvarez lens, micro Alvarez lens array, diffractive lens and Fresnel lens has proven that the advanced mold fabrication and injection molding process can provide an easy and quick solution for freeform optics. In addition, simulation with Moldflow MPI6.1 was implemented to verify the experiment results and the prediction of the simulation results was validated using experiment results. Experimental results also showed that injection molding process is capable for precision optics manufacturing with accurate mold compensation and process control.
Download or read book Injection Molding written by Phoebe H. Kauffer and published by . This book was released on 2011 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Injection moulding is one of the most versatile and important manufacturing processes, capable of mass-producing complicated plastic parts in a variety of complex shapes with high dimensional precision. It is a major processing technique for converting thermoplastic and thermosetting materials with the aid of heat and pressure into complicated parts, consuming world-wide approximately 32% of all plastics. This book presents current research data in the study of injection moulding from across the globe, including an overview of injection moulding as a manufacturing technique for pharmaceutical applications; melt/solid weldline in over injection moulding; metal injection moulding of Co for biomedical applications; and the application of ultrasonic technology in the injection moulding process.
Download or read book Injection Molding Handbook written by D.V. Rosato and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 1484 pages. Available in PDF, EPUB and Kindle. Book excerpt: This third edition has been written to thoroughly update the coverage of injection molding in the World of Plastics. There have been changes, including extensive additions, to over 50% of the content of the second edition. Many examples are provided of processing different plastics and relating the results to critiCal factors, which range from product design to meeting performance requirements to reducing costs to zero-defect targets. Changes have not been made that concern what is basic to injection molding. However, more basic information has been added concerning present and future developments, resulting in the book being more useful for a long time to come. Detailed explanations and interpretation of individual subjects (more than 1500) are provided, using a total of 914 figures and 209 tables. Throughout the book there is extensive information on problems and solutions as well as extensive cross referencing on its many different subjects. This book represents the ENCYCLOPEDIA on IM, as is evident from its extensive and detailed text that follows from its lengthy Table of CONTENTS and INDEX with over 5200 entries. The worldwide industry encompasses many hundreds of useful plastic-related computer programs. This book lists these programs (ranging from operational training to product design to molding to marketing) and explains them briefly, but no program or series of programs can provide the details obtained and the extent of information contained in this single sourcebook.
Download or read book Fabrication of Complex Optical Components written by Ekkard Brinksmeier and published by Springer Science & Business Media. This book was released on 2012-09-14 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: High quality optical components for consumer products made of glass and plastic are mostly fabricated by replication. This highly developed production technology requires several consecutive, well-matched processing steps called a "process chain" covering all steps from mold design, advanced machining and coating of molds, up to the actual replication and final precision measurement of the quality of the optical components. Current market demands for leading edge optical applications require high precision and cost effective parts in large volumes. For meeting these demands it is necessary to develop high quality process chains and moreover, to crosslink all demands and interdependencies within these process chains. The Transregional Collaborative Research Center "Process chains for the replication of complex optical elements" at Bremen, Aachen and Stillwater worked extensively and thoroughly in this field from 2001 to 2012. This volume will present the latest scientific results for the complete process chain giving a profound insight into present-day high-tech production.
Download or read book Precision Injection Molding written by Jehuda Greener and published by Hanser Publications. This book was released on 2006 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the key aspects of the production of high precision components is the need to meet extremely tight dimensional tolerances, typically in the submicron range, and maintain these tolerances over the practical lifetimes of the molded articles. In addition, as many of the precision components are utilized in various optoelectronic systems and devices, control of optical and electrical properties is often crucial. The strict control of dimensional and electro-optical properties requires a systematic reexamination of the conventional injection-molding process with special consideration of its impact on the dimensions and electro-optical characteristics of the molded article. This volume examines precision injection molding from different perspectives, covering materials, process and hardware aspects of the technology, with special emphasis on the dimensional integrity and stability of the molded components. Special topics covered in this volume include: dimensional stability of molded plastics, models for warpage development, compact disc molding, process control, crystallization phenomena in injection molding, micro-molding and microfluidics.
Download or read book Handbook of Plastic Optics written by Stefan Bäumer and published by John Wiley & Sons. This book was released on 2006-03-06 with total page 201 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of plastic optics instead of glass offers a number of advantages. Most importantly, it is far less expensive, and therefore opens a huge potential for mass production. It also offers the opportunity to use unique element configuration. This book gives a coherent overview over the current status of injection molded optics describing in detail all aspects of plastic optics, from design issues to production technology and quality control. The focus is firmly set on practical applications, making this an indispensable information source for all those working in optics research and development. The contributors, each one a leading expert in his chosen discipline, possess either a background in industry or close relations to the industry, thus bringing in an ample amount of practical experience.
Download or read book Micro Injection Molding written by Guido Tosello and published by Carl Hanser Verlag GmbH Co KG. This book was released on 2019-06-11 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: "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
Download or read book Intelligent Optimization of Mold Design and Process Parameters in Injection Molding written by Mehdi Moayyedian and published by Springer. This book was released on 2018-11-02 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes an effective framework for setting the right process parameters and new mold design to reduce the current plastic defects in injection molding. It presents a new approach for the optimization of injection molding process via (i) a new mold runner design which leads to 20 percent reduction in scrap rate, 2.5 percent reduction in manufacturing time, and easier ejection of injected part, (ii) a new mold gate design which leads to less plastic defects; and (iii) the introduction of a number of promising alternatives with high moldability indices. Besides presenting important developments of relevance academic research, the book also includes useful information for people working in the injection molding industry, especially in the green manufacturing field.
Download or read book Gas Assist Injection Molding written by Amitesh Agrahari and published by Independently Published. This book was released on 2015-09 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt: A Complete Gas Assist Injection Molding Book with Case StudyThis book covers - Why Plastics demand are super high ? - How Injection Molding Process are manufacturing leader ?- Literature - Plastics History - Plastic Technology- Polymer Properties & Behavior- Product Design & Mold Design- Gas Assist Injection Molding Machines & Equipment- Case Study - Process Study & Analysis - Conclusion- Future Scope
Download or read book Modern Manufacturing Processes written by Muammer Koç and published by John Wiley & Sons. This book was released on 2019-09-04 with total page 549 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides an in-depth understanding of the fundamentals of a wide range of state-of-the-art materials manufacturing processes Modern manufacturing is at the core of industrial production from base materials to semi-finished goods and final products. Over the last decade, a variety of innovative methods have been developed that allow for manufacturing processes that are more versatile, less energy-consuming, and more environmentally friendly. This book provides readers with everything they need to know about the many manufacturing processes of today. Presented in three parts, Modern Manufacturing Processes starts by covering advanced manufacturing forming processes such as sheet forming, powder forming, and injection molding. The second part deals with thermal and energy-assisted manufacturing processes, including warm and hot hydrostamping. It also covers high speed forming (electromagnetic, electrohydraulic, and explosive forming). The third part reviews advanced material removal process like advanced grinding, electro-discharge machining, micro milling, and laser machining. It also looks at high speed and hard machining and examines advances in material modeling for manufacturing analysis and simulation. Offers a comprehensive overview of advanced materials manufacturing processes Provides practice-oriented information to help readers find the right manufacturing methods for the intended applications Highly relevant for material scientists and engineers in industry Modern Manufacturing Processes is an ideal book for practitioners and researchers in materials and mechanical engineering.
Download or read book Process Studies in Precision Injection Molding of Amorphous and Liquid crystalline Polymers written by Chester Liu and published by . This book was released on 1992 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optics Design and Precision Manufacturing Technologies written by Guo Fan Jin and published by Trans Tech Publications Ltd. This book was released on 2007-12-06 with total page 1386 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of this collection was to provide an exciting forum for the exchange of the latest research findings and developments in the fields of optical design, advanced optics manufacturing technology and optical metrology. Approximately 250 papers from over 70 institutes and high-tech organizations in 13 countries were submitted, from which 235 papers were selected for publication in this collection.
Download or read book Design Fabrication and Metrology of Precision Molded Freeform Plastic Optics written by Likai Li and published by . This book was released on 2014 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main focus of this dissertation is to seek scientific knowledge and fundamental understanding of molding process for freeform optical lens fabrication by integrating freeform optical design, precision freeform molding making, numerical modeling of polymer lens forming process, and evaluation of the molded freeform optics. Compared with conventional optics, freeform optics provides more flexibilities and better performance. However, due to the complex nature of freeform optics manufacturing processes, the productivity and quality is difficult to improve, which subsequently results in higher manufacturing cost. Therefore, in order to create affordable freeform lenses with high quality, the method combining ultraprecision diamond machining and optical molding is proposed. Ultraprecision diamond machining is a process that allows us to generate precision freeform optical features on mold surfaces without post polishing, while microinjection/compression molding is proven high volume manufacturing process used to reduce production cost. The diamond machining for both regular metal materials and brittle materials are discussed to obtain high quality molds with optical finish. In addition, two novel process designs are presented to fabricate hybrid glass-polymer achromatic lenses using compression molding and injection molding, respectively.
Download or read book Precision Lens Molding of Glass A Process Perspective written by Jayson J. Nelson and published by Springer Nature. This book was released on 2020-04-10 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights the tools and processes used to produce high-quality glass molded optics using commercially available equipment. Combining scientific data with easy-to-understand explanations of specific molding issues and general industry information based on firsthand studies and experimentation, it provides useful formulas for readers involved in developing develop in-house molding capabilities, or those who supply molded glass optics. Many of the techniques described are based on insights gained from industry and research over the past 50 years, and can easily be applied by anyone familiar with glass molding or optics manufacturing. There is an abundance of information from around the globe, but knowledge comes from the application of information, and there is no knowledge without experience. This book provides readers with information, to allow them to gain knowledge and achieve success in their glass molding endeavors.
Download or read book Injection Moulding Of Plastics written by and published by Engineers India Research In. This book was released on 2008* with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book 'Injection Moulding of Plastics' covers various methods including Injection Moulding, Setting-up Mould and Machine,Effect of Processing on Mechanical Properties, Mouldflow, Computer Controlled Automatic Injection Moulding Machine, Maintenance of Injection Moulding Machine, CAE and CAD Technology in Moulds Making, Injection Moulding Process, Specialised Injection Moulding Process, Troubleshooting in Injection Moulding, Injection Moulding of Thermosets, Injection Moulding Machine Design for Injection Moulds, Designing Moulds for Thermoset Processing, Injection Moulded Plastic Components, Plastic Moulded Toys, Plastic Injection Moulding Products, Plastic Injection Moulding Items (like Bucket, Plastic Chairs, Bathing Tub). The book has been written for the benefit and to prove an asset and a handy reference guide in the hands of new entrepreneurs and well established ind ustrialists
Download or read book Polymer Science and Engineering written by National Research Council and published by National Academies Press. This book was released on 1994-01-01 with total page 193 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymers are used in everything from nylon stockings to commercial aircraft to artificial heart valves, and they have a key role in addressing international competitiveness and other national issues. Polymer Science and Engineering explores the universe of polymers, describing their properties and wide-ranging potential, and presents the state of the science, with a hard look at downward trends in research support. Leading experts offer findings, recommendations, and research directions. Lively vignettes provide snapshots of polymers in everyday applications. The volume includes an overview of the use of polymers in such fields as medicine and biotechnology, information and communication, housing and construction, energy and transportation, national defense, and environmental protection. The committee looks at the various classes of polymersâ€"plastics, fibers, composites, and other materials, as well as polymers used as membranes and coatingsâ€"and how their composition and specific methods of processing result in unparalleled usefulness. The reader can also learn the science behind the technology, including efforts to model polymer synthesis after nature's methods, and breakthroughs in characterizing polymer properties needed for twenty-first-century applications. This informative volume will be important to chemists, engineers, materials scientists, researchers, industrialists, and policymakers interested in the role of polymers, as well as to science and engineering educators and students.
Download or read book Troubleshooting Injection Moulding written by Vannessa Goodsgip and published by iSmithers Rapra Publishing. This book was released on 2004 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annotation Injection moulding is one of the most commonly used processing technologies for plastics materials. Proper machine set up, part and mould design, and material selection can lead to high quality production. This review outlines common factors to check when preparing to injection mould components, so that costly mistakes can be avoided. This review examines the different types of surface defects that can be identified in plastics parts and looks at ways of solving these problems. Useful flow charts to illustrate possible ways forward are included. Case studies and a large b257 of figures make this a very useful report.
