Dissertations / Theses on the topic 'Injection molding'
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S:t, Clair Renard Carl. "Injection molding WPC." Thesis, KTH, Industriell produktion, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-57943.
Full textMcLeod, Michael Allen. "Injection Molding of Pregenerated Microcomposites." Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/28844.
Full textPh. D.
Urs, Shravan B. R. "SCHEDULING ROTARY INJECTION MOLDING MACHINE." Ohio University / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1132529304.
Full textSrithep, Yottha. "A study on material distribution, mechanical properties, and numerical simulation in co-injection molding." Columbus, Ohio : Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1204150909.
Full textCastro, Carlos. "Multiple criteria optimization in injection molding." Connect to this title online, 2004. http://hdl.handle.net/1811/322.
Full textTitle from first page of PDF file. Document formattted into pages: contains vi, 49 p.; also includes graphics. Includes bibliographical references (p. 46). Available online via Ohio State University's Knowledge Bank.
Rännar, Lars-Erik. "On Optimization of Injection Molding Cooling." Doctoral thesis, Norwegian University of Science and Technology, Department of Engineering Design and Materials, 2008. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-2154.
Full textThis thesis is devoted to analysis and optimization of the injection molding process with a focus on the mold. In the analysis, both process parameters and the design of the mold are taken in consideration. A procedure has been developed, i.e. a method and a program code, which enables optimization of different quantities, not only restricted to injection molding simulation, by altering different variables. There are many ways to interpret the word “optimization”. In this work, “optimization” means the use of mathematical algorithms in order to maximize or minimize any given quantity. This code, called VerOpt, is written in Matlab. It is versatile since it has the functionality of choosing different optimization routines, and it can make use of parallelization over TCP/IP and different external solvers. The software and different applications are further described in Paper A.
There is a pocketful of softwares on the commercial market today, which enables the analysis of the injection molding process. One example is the software Moldex3D by Coretech System. By using simulation in the product development process, much can be gained since the software allows one to make most of the tedious and cost-consuming trial-and-errors in the virtual world, instead of on the shop floor. In Paper B, Moldex3D is used in order to compare the efficiency, in terms of the dimensional accuracy, between two different cooling channel layouts. One conventional layout uses straight holes and a baffle, and another layout makes use of conformal cooling channels manufactured by Free-Form Fabrication (FFF). In Paper C, a comparative study is presented where numerical results are compared with corresponding experimental results using these two types of cooling channel design. For the FFF layout, the Electron Beam Melting (EBM) method was used to manufacture the core insert to the mold. In Paper D, the surface heat distribution of conventional and FFF inserts was investigated, and the influence of the coolant temperature on the surface of the insert was studied.
FFF, or Rapid Prototyping (RP), has been commercially available since the late eighties, but the method is not that well known within the injection molding industry. The first available material was plastics. Today, FFF has evolved and fully dense forms in different metal alloys can be manufactured which are suitable for mold inserts. Studies have shown that by using FFF mold inserts in injection molding, both that the part quality can be increased and that the costs for manufacturing the insert can be decreased. The effects of different process parameters on the warpage of a plastic part are however rather complicated and the introduction of new types of inserts manufactured by FFF makes these effects even harder to predict. In Paper E, Design of Experiments (DOE) is used in order to investigate the influence of different process parameter on the critical dimensional accuracy of a test part. The same part was used for two different studies: one using conventional cooling and the other one using an FFF layout.
In Paper F, four process parameters were chosen after considering the results obtained from the DOE in Paper E, as variables in an optimization study where the warpage of the test part was minimized using the VerOpt code. In order to measure the efficiency of the FFF mold insert, the optimization was performed on the conventional layout as well.
In conclusion, this work has demonstrated the feasibility of including a versatile optimization environment to a commercial injection molding software, and it has also pointed out some important differences in the influence of different process parameters on the warpage of a plastic part when conventional and FFF cooling channel layouts are used.
Yao, Ke. "Energy-efficient control in injection molding /." View abstract or full-text, 2008. http://library.ust.hk/cgi/db/thesis.pl?CENG%202008%20YAO.
Full textThiriez, Alexandre. "An environmental analysis of injection molding." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/35646.
Full textIncludes bibliographical references (p. 82-90).
This thesis investigates injection molding from an environmental standpoint, yielding a system-level environmental analysis of the process. There are three main objectives: analyze the energy consumption trends in injection molding machinery, explore the environmental performance of different technological alternatives, and provide a transparent life cycle inventory (LCI) identifying the mayor players in terms of environmental impact. The choice of injection molding machine type (hydraulic, hybrid or all-electric) has a substantial impact on the specific energy consumption (SEC), energy used per kg of processed polymer. The SEC values for hydraulic, hybrid and all-electric machines analyzed are 19.0, 13.2 and 12.6 MJ/kg respectively (including auxiliaries, compounding and the inefficiency of the electric grid). For hydraulic and hybrid machines SEC seems to exhibit a decreasing behavior with increasing throughput. This derives from spreading fixed energy costs over more kilograms of polymer as throughput increases. For all-electric machines SEC is constant with throughput. As viscosity and specific heat capacity increase so does SEC. Finally, SEC varies greatly with part shape. The thinner and the greater the projected area of the part the greater the SEC.
(cont.) When the polymer production stage is included in the analysis, the energy consumption values increase up to 100 MJ/kg. After polymer production, injection molding and extrusion have the greatest environmental impact in the whole LCI. The overall injection molding energy consumption (excluding polymer production) in the U.S. on a yearly basis amounts to 2.06 x 108 GJ. This value is of similar magnitude to the overall U.S. energy consumption for sand casting, and to the entire electricity production of some developed countries.
by Alexandre Thiriez.
S.M.
Berkery, Daniel J. (Daniel John). "Process monitoring for plastics injection molding." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/12746.
Full textIncludes bibliographical references (leaves 196-197).
by Daniel John Berkery.
M.S.
Xu, Guojung. "Study of thin-wall injection molding." Connect to this title online, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1078788946.
Full textTitle from first page of PDF file. Document formatted into pages; contains xxi, 238 p.; also includes graphics Includes bibliographical references (p. 231-238). Available online via OhioLINK's ETD Center
Yang, Yi. "Injection molding control : from process to quality /." View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?CENG%202004%20YANG.
Full textIncludes bibliographical references (leaves 218-244). Also available in electronic version. Access restricted to campus users.
Kim, Nam Hyung. "INJECTION-COMPRESSION AND CO-INJECTION MOLDINGS OF AMORPHOUS POLYMERS: VISCOELASTIC SIMULATION AND EXPERIMENT." Akron, OH : University of Akron, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=akron1230065091.
Full text"May, 2009." Title from electronic dissertation title page (viewed 11/27/2009) Advisor, Avraam I. Isayev; Committee members, James L. White, Erol Sancaktar, Kevin Kreider, Minel J. Braun; Department Chair, Sadhan C. Jana; Dean of the College, Stephen Cheng; Dean of the Graduate School, George R. Newkome. Includes bibliographical references.
Pham, Giang T. "Ejection force modeling for stereolithography injection molding tools." Thesis, Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/18214.
Full textTrevino, Lisandro. "Mold Filling Analysis of Structural Reaction Injection Molding and Resin Transfer Molding." The Ohio State University, 1990. http://rave.ohiolink.edu/etdc/view?acc_num=osu1392736921.
Full textMoore, Christopher Mark. "Organic gels for injection molding of powders." Thesis, Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/19907.
Full textKim, Sang-Gook. "Knowledge based synthesis system for injection molding." Thesis, Massachusetts Institute of Technology, 1985. http://hdl.handle.net/1721.1/88804.
Full textMICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING.
Includes bibliographical references.
by Sang-Gook Kim.
Ph.D.
Al-Rubaian, Ali I. "Advanced temperature conrol in injection molding machines /." The Ohio State University, 2000. http://rave.ohiolink.edu/etdc/view?acc_num=osu148819515435711.
Full textVolpe, Valentina. "Foam Injection molding with physical blowing agents." Doctoral thesis, Universita degli studi di Salerno, 2015. http://hdl.handle.net/10556/1963.
Full textFoam injection molding uses environmental friendly blowing agents under high pressure and temperature to produce parts having a cellular core and a compact solid skin (the so-called “structural foam”). The addition of a supercritical gas reduces the part weight and at the same time improves some physical properties of the material through the promotion of a faster crystallization; it also leads to the reduction of both the viscosity and the glass transition temperature of the polymer melt, which therefore can be injection molded adopting lower temperatures and pressures. In this work, the effect of the addition of a blowing agent within a polymeric matrix and the influence of the process conditions on the rheology of the melt, on the physical and mechanical properties and on the morphology of the final product was analyzed. Several polymeric materials were adopted in this work: two thermoplastic polymers commonly used for conventional injection molding and previously well characterized, namely a semi-crystalline polypropylene and an amorphous polystyrene, and two grades of a biodegradable polymer, polylactic acid (PLA). With particular reference to biodegradable polymers, the utilization of the foam injection molding process with physical blowing agents seems the ideal solution to problems of moldability caused by the high viscosity and operative condition very close to those of degradation for this class of materials. Before the foam injection molding, the PLA was foamed by means of a batch foaming system. In particular, the effect of foaming temperature, solubilization time and cooling rate on the morphology of the samples and on their density was analyzed. Several foam injection molding experiments were carried out by using cavities with two different thicknesses and under different experimental conditions. Rheological measurements of the polymer/gas solutions were also obtained by means of a modified nozzle with a slit rheometer with pressure transducers which allow to obtain on-line viscosity measurements. Rheological measurements conducted on the polymer-gas mixtures, showed a significant reduction in viscosity. Furthermore, reduction in density of the foamed samples compared to the unfoamed ones varies with increasing amount of gas injected and increases with increasing injection flow rate, reaching values higher than 40% for polystyrene and of almost 50% in the case of PLA. The analysis of the mechanical properties for both materials showed that the values of Young's modulus were lower than that of the molded part without gas. However, the reduction in Young’s modulus of the foamed parts compared to the Young’s modulus of the unfoamed ones is almost entirely compensated by the reduction in density. On increasing the amount of gas, the morphology of the samples becomes more homogeneous, with an increasing void percentage and smaller bubbles radius. However, there seems to be an optimal physical blowing agent content that leads to the best microcellular structure and the maximum density reduction and mechanical properties. Finally, a study of the effect of gas on the crystallinity of the PLA was carried out by Differential Scanning Calorimetry (DSC) and Wide Angle X-ray Scattering. Results shown a higher cristallinity of the foamed core with respect to the compact skin and the unfoamed part. This is an aspect of considerable importance for biodegradable polymers, for which the crystallinity has a marked effect on properties. [edited by Author]
XI n.s.
Gava, Alberto. "Modelling of the micro injection molding process." Doctoral thesis, Università degli studi di Padova, 2008. http://hdl.handle.net/11577/3427200.
Full textCon tassi di crescita annui del 20 per cento (dati relativi a Dicembre 2007), si viene a delineare un nuovo ed interessante campo di attività per l’industria nazionale e, in particolare, per quella della trasformazione plastica. I microsistemi conquistano sempre più settori come la meccanica di precisione, telecomunicazione, tecnologia applicata alla medicina e biotecnologia, ma in misura crescente anche l’industria automobilistica. A causa del crescente fabbisogno e volume richiesto, il microstampaggio ad iniezione è destinato ad assumere un ruolo d’eccellenza nei processi di produzione. Così come nel processo di stampaggio convenzionale ci si avvale della simulazione numerica per l’ottimizzazione del prodotto, dei parametri di processo e la riduzione del costo totale. Gli attuali codici di calcolo offrono risultati accurati nel caso del processo convenzionale, ma necessitano di ulteriori sviluppi per quanto riguarda applicazioni più tecnologiche quale il microstampaggio ad iniezione. Ciò è dovuto principalmente al fatto che parametri e modelli del materiale assunti su macroscala non risultano essere altrettanto validi in un processo in cui il polimero è sottoposto ad alte velocità di deformazione e a gradienti termici notevoli. L’obiettivo principale di questo lavoro è fornire un metodo utile a valutare la capacità degli attuali codici di calcolo nel descrivere correttamente l’avanzamento del flusso in componenti microstrutturati. L’approccio proposto consiste nel valutare il riempimento di una cavità opportunamente progettata e lavorata utilizzando le linee di giunzione come indicatori di flusso. Questo metodo si pone come valida alternativa all’approccio più comunemente seguito e basato sul confronto di riempimenti incrementali tra processo sperimentale e simulazione numerica, laddove la posizione e forma del fronte di flusso è fortemente influenzata da contrazioni termiche e rilassamento delle tensioni residue post-stampaggio. Con questo obiettivo sono state condotte simulazioni numeriche in ambiente Moldflow® e si sono confrontati i loro risultati con prove sperimentali. In secondo luogo è stata condotta un’analisi di sensitività al fine di valutare l’influenza di dati reologici e di un coefficiente all’interfaccia polimero/stampo validi su microscala, della pressione sulla viscosità e di un modello unificato che consideri entrambe la viscosità elongazionale e a taglio sull’accuratezza dei risultati numerici. Una volta appurato che il modello viscoso del materiale implementato nei convenzionali codici di calcolo non risulta essere altrettanto accurato in processi che coinvolgono alte velocità di deformazione, si è deciso di condurre simulazioni numeriche non convenzionali con l’intenzione di considerare anche la componente elastica del polimero. Le simulazioni sono state condotte in ambiente Ansys Polyflow® implementando un modello viscoelastico e confrontando i risultati numerici in termini di evoluzione del flusso durante il riempimento e di caduta di pressione_acquisita_all’iniezione.
Melocchi, A. "INJECTION MOLDING/MICROMOLDING APPLICATIONS TO DRUG DELIVERY." Doctoral thesis, Università degli Studi di Milano, 2015. http://hdl.handle.net/2434/251825.
Full textHioe, Yunior. "Mold thermal design and quasi steady state cycle time analysis in injection molding." Connect to resource, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1141840509.
Full textChen, Xi. "A study on profile setting of injection molding /." View abstract or full-text, 2002. http://library.ust.hk/cgi/db/thesis.pl?CENG%202002%20CHEN.
Full textAlam, Kevin. "A genetic optimization of injection molding runner balancing /." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=85115.
Full textOta, Toshimasa 1956. "Microcellular polyurethane foaming by modified reaction injection molding." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/11495.
Full textLiou, Si-Ming, and 劉熙銘. "Injection Compression Molding Applied on Power Injection Molding." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/26438288683887691680.
Full text國立臺灣大學
機械工程學系
85
Injection molding is now used to mold precision parts. The quality of molding is mainly controlled by the post-filling process. Though the post-filling process can be controlled through pressure and temperature, the response is slow. After gate freezes, the control through pressure becomes impossible. To enhance the control capacity during the post-filling process, adding compression to the traditional injection molding process reopen the channel for pressure control. This research first investigated the effects of adding compression on the Thermal-mechanical history and quality of molder parts. An instrumented injection molding machine with compression cylinder is used. Mold with circular disk cavity is equipped with manually shut-off mechanism. The Thermal- mechanical history during the injection compression molding is identified with aid of a PC-based data acquisition system. The quality of parts are determined by deviation from mold dimension, the shrinkage and warpage after demolding and the green density. This research then studied the effects of processing conditions on part quality. The control parameters are compression force, compression speed, compression time, cooling time and mold temperature. The injection compression molding can produce parts with better dimensional control and density than those from conventional injection molding. Parts with small orientation can be obtained by closing gate and starting compression early, better before the peak cavity pressure is reached.
Du, Zheng Fang, and 杜正方. "Gel injection molding." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/73182440257126678196.
Full textHuang, Jian-Wei, and 黃建維. "Ultrasonic Injection Molding." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/rfwcss.
Full text國立虎尾科技大學
機械與機電工程研究所
101
The procedure called Ultrasonic Injection Molding (UIM) in this thesis is to use Configure ultrasonic on injection machine platen for producing vibration. Configure ultrasonic is generally set on molding, but it was very inconvenient; therefore, it was bettered by setting configure ultrasonic on injection machine platen. Due to the characteristics of plastic materials, here I choose Polypropylene (PP), Acrylonitrile Butadiene Styrene (ABS) and Polybutylene Terephthalate (PBT) to ensure the effects of UIM on different types of materials. To investigate the effects of UIM on different materials and different parameter, experimental research method was used to analyze many parameters, including screw temperature, inject pressure, inject speed, inject time, hold pressure, hold speed, and hold time.
Hon, Ming-Yow, and 洪銘佑. "A Post-Filling Modeling of Injection Molding and Injection Compression Molding." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/17541418916949619358.
Full text國立臺灣大學
機械工程研究所
81
The quality of the molded thermoplasitcs parts are mainly determined by the thermomechanical history during post-filling. The pressure and temperature changes during post-filling of injection molding and injection compression molding were simulated in this study. The predicted thermomechanical process data were further converted to the shrinkage and density distributions through model describing thermodynamic state. Most previous simulations assumed variable pressures for different sections, or used average temperature to find the cavity pressure. Also conventional P-v-T equations of state assumed quasi-equlibrium and failed to explain cooling-rate effect and pressure-induced densitification. In this study, pressure was assumed to be same throughout thickness. This pressure will make the sum of volume occupied by the masses in all sections equal to the cavity thickness. Also this reserach used a state model which assumes that thermodynamic properties of polymeric material depends not only on P and T, but also on a set of structure-related parameters. The simulated pressure- time traces after gate-freeze during injection molding, the thickness change during compression and the predictions of final shrinkage were compared to the experimental measurements. Preliminary results showed good aggreement in trend.
Hsu, Shiuh Sheng, and 徐旭昇. "Injection-Molding Expert System." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/03557717477002070642.
Full text中原大學
機械工程研究所
84
With the growing usage of plastic products, many efforts have been made to raise quality and efficiency. Good and steady quality must take account of whole process procedure for injection molding, including polymer, mold design, and process parameter. Therefore, it is important to propose an effective and systematic method. Because the injection molding process is complex, it is impossible to solve molding problem by numerical, even if we can use CAE software to simulation and analysis. It''s also not easy to obtain a highly precise and useful knowledge from manuals or reference books. Therefore, the injection molding process is closely linked to the personal experience of experts. In order to quantitatively provide optimized processing parameter and design guidelines, this thesis will integrate inference engine of knowledge base with Taguchi method and Fuzzy logical to build a dedicated expert system for injection molding. As Windows is becoming the standard user interface due to its graphical and multi-tasking capability, this research use Windows as the developing platform to create an easy-to use environment.In addition, considering capability, standardization, and efficiency, C language will be using to developing the integrated expert system. This thesis is to provide an expert system by integrating processing guidelines, design concepts, artificial intelligence, Fuzzy logic, CAE analysis, and Taguchi method. The system will provide the total solution for injection molding process and uplift the related techniques and developments.
Tsai, Lang-Fu, and 蔡浪富. "Characteristics of Injection Pressure for Injection Molding Machine." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/53129583051230886111.
Full textLiang, Wu Chih, and 吳致諒. "Molding Characteristics Study of Thin-wall Injection Molding Process." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/85558105950165514390.
Full text中原大學
機械工程學系
87
The preliminary research in the moldability, the characteristic of CAE, mechanical properties of PC parts, which contains different thickness in thin-wall injection molding and Conventional Injection Molding (CIM) are the main purpose in the present study. At first, we focus on the moldability and cavity pressure which influenced on the molding parameters in tensile parts. Then introduced the concept of molding windows to moldability. After that, the thin-wall injection molding parts & CIM parts were investigated via tensile experiment which were similar to the method of ASTM, in order to compare the mechanical properties under the contained different thickness. By using digital photo elasticity system, we can observed the residual stress which influenced on the molding parameters. Based on the results, the following conclusions can be made: 1. High injection speed and high injection pressure influenced moldability. 2. High material temperature and high molding temperature in better stress distribution . 3. It is noticed that the time of F/P switch over and packing pressure will increase molding pressure and formation of specimens. The thinner the specimen thickness is, the larger the mold pressure becomes. However, the pressure is unaffected if the packing time is long. The results of this study can supports plastic parts designers who develop thin-wall injection molding for helping product design , mold development ,process control and dimension control technique to having the construct of optical polymer designer.
Kuan, Yew Lee, and 李光耀. "Velocity Control for Injection Molding." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/06111590266847323956.
Full textYu, Chih-Sen, and 游智森. "Injection/ Compression Liquid Composite Molding." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/32304472633690854288.
Full text國立中央大學
機械工程研究所
90
ABSTRACT In recent years, Resin Transfer Molding (RTM) has been widely used in aerospace, automobile and precision industries, because its processing cycle is short; besides the stiffness and precision of its products are high and the styles of the products can be easily changed. Due to the size of a finish is too large, or the permeability of the fiber is too low, the filling time would be longer. Therefore, we try to use the filling method of Injection-Compression liquid composite molding to shorten the filling time. The experiment use transparent acrylic mold, combined with flow field visualization to analyze and simulate the flow field condition of Injection-Compression liquid composite molding in filling period. We use Buckingham Theorem to couple the processing parameters, such as injection pressure, compression pressure, gap size, porosity, permeability, surface tension, velocity, and plot them as a function diagram; besides, we also compare our findings with RTM to show the advantages of Injection-Compression liquid composite molding. . Key word：reinforced plastic, Liquid Composite Molding, Injection / Compression Liquid Composite Molding, Resin Transfer Molding, porous media
Peng, Chien-Hao, and 彭建豪. "Injection Molding of Zirconia Pellets." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/496tec.
Full text國立臺北科技大學
材料及資源工程系研究所
98
Yttrium Stabilized Zirconia (YSZ) has the good properties such as high hardness, high toughness, good chemical and high temperature stability. In this study, YSZ powder doped polymer molding materials, paraffin and stearic acid, prepared using the injection molding process of zirconia ceramics are characterized. The results indicate the solid loading 52 vol. % is limit of zirconia. Decreasing polypropylene and paraffin wax content ratio can decreases pore size and number of pores after sintering, as well as a decrease in the shrinkage of sample after sintering. The increase in solid content can enhance the density of the sintered bodies and a reduction in shrinkage. Yet, the increase in the solid content of shoot material difference is not good injection of liquidity. In order to avoid short shots or crack bormation in embryo pieces, injection speed and temperature need to increase. In the same solid content, the low proportion of polypropylene and paraffin wax, it wolld help narrow the pore and reduce shrinkage.
Wu, Chen-Wei, and 吳振維. "Disposable Injection-Molding Plastic Electrode." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/09915866249609238617.
Full textFang, Ting-Wei, and 枋定緯. "Study of Ultrasonic Injection Molding." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/52566473055567756908.
Full text臺灣大學
機械工程學研究所
98
This research is devoted to investigating the effects of ultrasonic vibration in the filling and packing behaviors of the Polycarbonate (PC) melt in flat plates and plates with microstructures. First, with and without ultrasonic vibration, the filling behaviors of PC melt in the cavities of flat plates of 1.0 mm and 0.5 mm thick with aid of short-shots. This study discovered that the length and weights of short-shots in filling the 1mm-thick cavities increased with ultrasonic vibration, compared to these without ultrasound. On the other hand, little improvements were observed in the filling of the thin-wall parts of 0.5 mm thick. The effects ultrasonic vibration in extending the gate freeze time were systematically investigated. Ultrasonic vibration could significantly prolongs the gate freeze time and extends the packing process. It was found that the amplitude of ultrasonic vibration must exceed a particular level for the effect of ultrasonic vibration to be significant. The ultrasonic vibration in this study showed no effects in reducing residual stress. This maybe due to the limit of our facility and implementation. In the other part of this research, the replication of V-groove microstructures in the plates of 1 mm thick were also investigated. It was found that ultrasonic vibration improves replication of microstructrues. The effects of vibration in injection molding with different injection speeds, packing pressures and mold temperatures have been studied. The improvements in enhancing the degree of replication are significant, especially at low packing pressure. This study demonstrates that ultrasonic vibration improves the filling and packing of flat and v-grooved plates, showing the potential of using the ultrasonic vibration in enhancing the molding capacity of injection molding.
Tien, Phan Diep Duc, and 潘葉德進. "Study of Injection Pressure Response for Injection Molding Machine." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/19481522549688950442.
Full text國立高雄應用科技大學
機械與精密工程研究所
96
In an injection molding machine the injection pressure is the key parameter required for the injection molding process. This thesis applied simulation model to obtain the injection pressure at the nozzle. The simulation aimed at saving time and money in comparison to the conventional methods. A study on injection pressure was carried out and programs were written in Matlab to develop and simulate the response of nozzle pressure. However, the study of injection pressure was considered in the injection stage of the injection molding process. Studying the injection pressure involved the simulations to obtain the effects of the parameters such as materials, changing velocity of the screw, changing area ratio of the screw, changing the dimension of the nozzle, changing dimensions of the stroke, and changing the check valve dimension. To study this injection pressure, the profile of the screw was set at the beginning of the process. Through this profile, most of parameters having effect on the injection pressure were found. The results obtained showed that the increasing velocity of the screw increased the injection pressure; increasing screw radius increased the injection pressure; increasing radius of the nozzle decreased the injection pressure; changing viscosity of material from high to low changed the injection pressure from high to low; bigger stroke dimension caused smaller injection pressure. After obtaining the injection pressure, the injection pressure effects on the check valve were considered without the shear strain effect. Bigger injection pressure caused smaller closing of the back-flow into the rear screw tip. Decreasing the radius of the check valve caused the same response for closing of the back-flow into the rear screw tip. Keeping constant distance from the sliding ring to the check ring seat and increasing the length of the check valve caused longer closing of the back-flow into the rear screw tip.
Wang, Woei-Shyang, and 王偉祥. "Study on The Injection Compression Molding." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/50113734865234817195.
Full text國立成功大學
航空太空工程學系
86
Injection molding is now used to mold precision parts. The quality of molding is mainly controlled by the post-filling process. Although the post-filling process can be controlled through the gate pressure and mold temperature, the response is slow. To enhance the control capacity during the post-filling process, adding the action of mold compression to the traditional injection molding process improves thepressure control. In this study, a experimental system for injectioncompression molding was designed and built. An injection molding machine was modified to run the injection/ compression molding. A compact disk mold was designed to test the process. This experiment compared the molding results of injection molding and injection compression molding based on the quality of molded parts.It is found that injectioncompression molding can produce parts with better dimensional control than those from conventional injection molding. Besides, this method can effectively reduce warpage.
Huang, Jin-Jay, and 黃俊傑. "Injection Molding of Cr3C2/Al2O3 Composites." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/59079432223330980931.
Full text國立成功大學
材料科學(工程)學系
84
Alumina is one of the most popular and utilized structural ceramics. However, the intrinsic brittleness of alumina makes itsreliability limited and prevents wider usage. Alumina can be strengthened by incorporating Cr3C2 particles through hot- pressingand pressureless sintering process. Fully dense compacts with Cr3C2 particulate reinforced alumina matrix composites have excellent mechanical properties. This investigation concentrates on the effect of sintering atmosphere,interfacial properties and injection molding of Al2 O3/Cr3C2 composites. Experimental results show that the relative density and bendingstrength of Al2O3/Cr3C2 sintered in vacuum was better than in argon.By sintering in vacuum, flexural strength and toughness of 490MPa and 6.0MPa·m1/2 were obtained. The interface of Al2O3/Cr3C2 sintered in vacuum have no obvious reactions. The ceramic injection molding of Al2O3/Cr3C2 composites ceramics is possible and provides assembly process suitable for mass production. In the present work, The effect of Cr3C2 (2mm) additions on rheology of ceramic injection molding blends were investigated. Fluidity is strongly influenced by powder loading, temperature and Cr3C2 contents. The addition of Cr3C2 apparently reduced the viscosity of ceramic injection molding blends. Cold isostatic press before sintering considerably enhanced therelative density, hardness and toughness of sintered samples. By controlling the amount of Cr3C2, flexural strength and toughness of Al2O3/Cr3C2 of 480MPa and 5.0MPa.m1/2 were obtained. Cr3C2 apparently inhabited the grain growth of alumina.
Huang, Meng Cheng, and 黃孟楨. "Metal injection molding industry competitive strategy." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/98892866551933973850.
Full text國立政治大學
經營管理碩士學程(EMBA)
98
In the fast growing IT world of today, Metal Injection Molding (MIM) technology transform the traditional manufacturing method of the metallic parts to a revolutionary fabrication process in the machinery industries. MIM actually has been developed for more than 30 years, and in the latest 5 years, the annual growth rate is about 10 to 15%. End products are commonly component items used in various industries and applications. Company P has been using powder metallurgical technology to produce auto parts. Although its business was affected by the slowdown of auto industries due to the financial storm in the second half of 2008, its advancement in the MIM technology, including the development of the energy saving material, had helped the company to survive in the downturn of auto industries. Another Company T in the case study has used the MIM technology to provide the diversified geometrically complex metal parts for more than 10 years. This study was using the tools of analysis and case studies to find the niche of metal injection molding industry for the enterprise to explore the appropriate managing strategies during they were developing and growing process of the business. The theoretical background of this study is referring to the industry analysis and 「Five Force analysis」 made by Professor Michael Porter of Harvard University in 1980 and 1985. It gives an overview and the overall environmental and competitive analysis and used for studying the development trend of the MIM industry. Using the SWOT matrix for strategy matching proposed by Weihrich in 1982, the company’s internal strengths, weaknesses and external opportunities and threats, could be analyzed and expressed in an explicit form. Then, maximize the strengths and opportunities and minimize the weaknesses and threats to define the present situation, and then develop the best applicable strategies for the company. Through industry analysis and case studies, this study concludes the followings: (1) Powder metallurgy and metal injection molding industry are affected by the global economic environment, oil prices and the technological advancement. (2) The life cycle of powder metallurgy industry is at its growth period, but the metal injection molding is at the end of embryonic period and moving to growth period. (3) Since it’s not easy to use the traditional fabrication process to make the complicated or asymmetric shaped metallic parts, the metal injection molding technology has the advantages of making the complicated parts with less fabrication steps. (4) Powder metallurgy and metal injection molding could continuously reduce costs and shorten the delivery time to increase their competitiveness. (5) The products could be widely used in various kinds of industry where the metallic parts are needed. Company P is producing one-third of the gears used in the world-wide auto industries and Company T is making the small and complex parts for the hand tools, 3C and IT industries with profits. Finally, the suggestions for metal injection molding industry are listed as follows: (1) Under the regulations of the environment protection, we should develop the energy conserving and carbon-reducing materials to meet the requirements. (2) China is developing the metal injection molding technology aggressively to meet the demand of its automobile market, which provides a great business opportunity of the auto parts supplier of Taiwan, (3) Since the life cycle of 3C and IT products is very short, the engineering team should design and fabricate the products in a very short time to the market. Also, it is necessary to use ERP management to reduce inventory and co-work with customers to develop products, conserve resources and reduce the risk.
Chang, Guang Rong, and 張光榮. "Process Control of Injection Molding Machine." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/47108995807662636986.
Full textKharbas, Hrishikesh Ashokrao. "Developments in microcellular injection molding technology." 2003. http://catalog.hathitrust.org/api/volumes/oclc/53145079.html.
Full textTypescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 116-121).
Jeng, Jia-Haur, and 鄭佳豪. "Injection Molding of Micro Lancet Needles." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/44885883243224427029.
Full text國立高雄應用科技大學
機械與精密工程研究所
95
Microneedles can be used for biomedical applications such as skin prick, blood collection, and drug delivery, etc. Many of the microneedles were fabricated by traditional machine or by Si etching based LIGA-like process. In this study, a micro lancet needle for blood test application was designed and fabricated by non-si etching LIGA-Like process, and the material of micro lancet needles fabricated by injection molding was PLA which has good biocompatibility. In this study, designs of different needle shapes were analyzed by ANSYS, and Moldex3D was applied to exploring possibility of mold design, and Taguchi method was used to investigate the relation between the processing parameters (melt temperature, mold temperature, injection speed, holding pressure, and holding pressure time) and the molding quality of micro lancet needles. This study also combined Taguchi method and Moldex3D software to obtain optimal processing parameters for minimizing warpage and shrinkage of micro lancet needles. In injection molding of micro lancet needles, Taguchi method was used to investigate the relation between the processing parameters (melt temperature, mold temperature, injection speed, and holding speed) and the molding quality of micro lancet needles. We can conclude that both melt and mold temperatures are the most important parameters on the molding quality of micro lancet needles. In this study, a PLA jagged shape micro lancet needle was developed using non-si etching LIGA-Like process and Battenfeld Microsystem 50 micro injection molding machine. The dimension of the micro lancet needle is as follows: length is 623 µm, width is 203 µm, and thickness is 106 µm.
HUANG, SHU-FEI, and 黃書菲. "Knit-line properties in injection molding." Thesis, 1990. http://ndltd.ncl.edu.tw/handle/77940873873197674500.
Full textSiao, Wunhao, and 蕭文豪. "Parameter of Coaster in Injection Molding." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/87330650808831565529.
Full text修平科技大學
精密機械與製造科技研究所
100
The advantages of plastics are quick production and lower density. The plastic products are generally produced using the injection molding process. The defects of unbalance shrinkage, residual stress and warpage will be caused in injection molding parts. The warpage affects the precision and assembly of molded parts among these defects. The level of warpage is highly related to the injection machine parameters setting. Therefore, the exploration of warpage is an important issue for the injection molding process. This study performs the analysis of coaster which is prepared by injection molding using Moldex3D software and Response Surface Methodology. The effect of injection machine parameters setting on the warpage was discussed. Furthermore, the optimal injection machine parameters were determined for minimizing the warpage in injection molding. To verify the accuracy of the optimal injection machine parameters, this study measures the warpage using Vision Measuring Machine. The simulated results obtained here can be useful for improving the disadvantages of trials and modification of mold on a traditional process. Moreover, this work not only improves the quality of molded parts, but also reduces the time and cost in the development stage.
Peng, Cheng-Chang, and 彭成彰. "Nano injection molding and optical property." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/31664322896088917957.
Full text國立中央大學
機械工程學系在職專班
102
A rapid, cost-effective and high-throughput process for nanotexturing subwavelength structures with high uniformity using the polycarbonate (PC) is realized via injection nanomolding. The process enables the precise control of nanohole array (NHA) surface topography (nanohole depth, diameter, and periodicity) over large areas thereby presenting a highly versatile platform for fabricating substrates with user-defined, functional performance. Specifically, the optical property of the PC substrates were systematically characterized and tuned through the modulation of the depths of NHA. The aspect ratio submicron holes can be easily modulated and experimentally proven by simply adjusting the molding temperature. The nanotextured depths were reliably fabricated in the range of 200 to 400 nm with a period of approximately 700 nm. The fabricated PC films can reduce the reflectivity from an original bare film of 10.2% and 8.9% to 1.4% and 2.1% with 400-nm depth of nanoholes at the wavelength of 400 and 550 nm, respectively. Compared with conventional moth-like nanostructures with nanopillar arrays with heights adjustable only by an etching process, this paper proposes a facile route with submicron holes to achieve a similar antireflective function, with a significantly reduced time and facile height modulation capability. Furthermore, the effects of multilayer coatings of dielectric and metallic layers on the nanomolded NHA have been performed and potential sensing application is explored.
LIN, MING-WAN, and 林明玩. "Research on aluminum alloy injection molding." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/8bqa65.
Full text楊恭選. "Design/Molding and Optimization Expert System for Gas-Assisted Injection Molding." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/49404993285044755143.
Full text中原大學
機械工程學系
85
The purpose of this study is to build up the "Design／Molding Guidelines" and expert system for the application of gas-assisted injection molding to assist engineers in product design, mold design and process optimization. The method used in this study is experience and data based expert system, statistical Taguchi approach and neural network analysis. First, an expert system concerning the qualitative and quantitative design／molding rules was constructed. Then optimized processing parameters was obtained by using statistical Taguchi approach and backpropagation. The results were also verified by experiments. Moreover, the possibility of training examples using neural network was evaluated by Taguchi method and the effect of learning rate and hidden node number to neural network learning rate was also investigated. The results of this research are stated as follow: 1. The expert system has been constructed for only for gas-assisted injection molding. It includes gas channel design rules, effects of processing parameters on molding ability, explorations of optimization for processing parameters, evaluations of part strength reinforced by gas channel and data base for hollowed core melt. 2. The experimental results of statistical Taguchi approach shows that the material amount of pre-filling and delay time have major effect on gas penetration length in spiral mold products. Other processing parameters such as mold temperatures, melt temperatures, gas pressure and injection speed has less significant effect. 3. In the analysis which combined the statistical Taguchi approach and backpropagation for evaluating learning rate of network, the usage of 14 processing parameter combinations which is different form the setting of table L18 shows that the learning effect of neural network is very good. Because of the skeleton of neural network used in this study can learn the parameter combinations to be set by L18 orthogonal table in statistical Taguchi approach. There is a better chance to find out the setting parameters for optimization. 4. The combinations of learning rate and hidden node number have best result in the combinations of three hidden nodes and 0.10 learning rate.
Wang, Wei-Tsan, and 王唯讚. "Molecular Dynamics Simulation of Molding Filling in Nano-Injection Molding Process." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/32393555864076768289.
Full text國立清華大學
化學工程學系
94
In this research, molecular dynamics simulation is adopted to simulate the molding filling in nano-injection molding process. Our work divided into two parts is as follows. (I) Glass transition temperature : Molecular dynamics is adopted to simulate the glass transition temperature of polypropylene at different chain length, and the chain length has 200, 400 and 800 , respectively. The simulated purpose is to explore the relation between the chain length(molecular weight) of polymer and the glass transition temperature of polymer. (II) We adopt molecular dynamics to simulate the nano-scale injection molding process, and investigate the defects during molding filling process. With decreasing the injection velocity, the adsorption phenomena at the entrance of mold will become more obvious. The orientation of polymer is obvious at the wall of runner and the wall which faces the entrance of mold. While the temperature of system at 350 K, polymer has less tendency to adsorb on the wall.
Huang, Ming-Cheng, and 黃銘城. "E-Learning Platform for Injection Molding Machine Specifically Used for CD Molding." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/50097153797916650663.
Full text中原大學
機械工程研究所
95
The present paper is constructed the injection molding learning platform in disc industries. The purpose is used E-information of injection molding knowledge in the design, manufacture and breakdown standardization services teaching. The user can choose injection molding process unit or exceptionally services unit that achieved interaction learning in the platform. The learning platform had two parts, one is constructed the operation knowledge of injection molding ; the other is used the injection molding machine service and the breakdown handling, that obtaining the best standardization processing of breakdown handling. The learning platform can provide the training with injection molding factory. Then, through the learning platform can increased efficiency education of injection molding process, operation processing and service skill for saving training cost, raising factory safety and enhanced the industry production.