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Dissertations / Theses on the topic 'Plastic injection moulding'
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1
Farrar, P. T. K. "Plastic injection moulding machine controllers." Thesis, Bucks New University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378918.
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Masuku, Eric S. "Intelligent CAD mould design for injection moulding." Thesis, University of Bath, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323605.
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Stidworthy, Paul. "An investigation into weld lines in thermoplastic injection moulding." Thesis, Coventry University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364595.
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Para, Marcel. "Výroba součásti Fixační podložka." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-416436.
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Order was given for the prodiction of 20 000 pieces of fixing washers. In this case was chosen injection moulding technology. Based on the research, a structural design of the mold was prepared together with the drawing documentation. From the range of materials, it was chosen polypropilene MOSTEN GB218, which is suitable for the given produstion. The simulation verified the reliability and quality of production. The parameters of injection moulding were determined by calculations, and the machine J180ADS – 180U was selected base of them. In the economic evaluation, the total costs for the production of the entire series were established on Nc=19626,43€.
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錢桂生 and Kwai-sang Chin. "An expert product development system for plastic injection moulding parts." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1996. http://hub.hku.hk/bib/B31234732.
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Ping, Pau Kwok. "Systematic studies on noise control of plastic injection moulding machine." Thesis, University of Warwick, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.265624.
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Chin, Kwai-sang. "An expert product development system for plastic injection moulding parts /." Hong Kong : University of Hong Kong, 1996. http://sunzi.lib.hku.hk/hkuto/record.jsp?B17545857.
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Marsh, Robert. "Visual analysis and diagnosis system for injection moulded components." Thesis, University of the West of England, Bristol, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249348.
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Statham, Michael J. "Economic manufacture of freeze-cast ceramic substrate shapes for the spray-forming process." Thesis, University of Bath, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285297.
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Ilyas, Ismet Priana. "Production of plastic injection moulding tools using selective laser sintering and high speed machining." Thesis, University of Leeds, 2007. http://etheses.whiterose.ac.uk/4048/.
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Global manufacturing trend and competition challenge every industry to seek new manufacturing methods to improve their business processes and speed up the product development cycle [Conolly, 2004a and Knights, 2001]. Among the candidates, layer manufacturing (LM) technologies appear to be a potential solution [Plam, 2002, and Grimm, 2004]. Recent LM technologies have led to a demanding application for developing production tools to manufacture parts, known as rapid tooling (RT). Selective laser sintering (SLS) is one of the leading LM systems available today in RT to manufacture injection mould (core/cavity) inserts [Kruth, 1998, Chua, 1999, Dormal, 1999, and Grenda, 2005]. However, the current capabilities of the SLS in producing metal parts have not yet fulfil the requirements of the injection mould inserts, especially in dimensional accuracy and surface finish quality [Francis, 2002 and Dalgamo, 2001 a]. The aim of this research is to use indirect SLS and high speed machining (HSM) in developing production-quality plastic injection moulding (core/cavity) inserts. The idea is that the indirect SLS process is utilised to build a near-net-shape inserts, while HSM is then utilised to finish the inserts to production specifications. Benchmark studies have been carried out to characterise the capabilities of both SLS and HSM with reference to the typical requirements of injection mould inserts. Utilising the study results, new developments of the mould inserts have been implemented on three major industrial case studies. Their performances have been evaluated and measured by comparing them with its respective original inserts. Furthermore, a set of design rules has been derived from best practices of the case studies, and have been validated by developing a new design for each case studies inserts. The results have demonstrated that the indirect SLS process has a capability III manufacturing a near-net shape of the insert which requires further related finishing to achieve final production specifications. The insert performances in some case studies have indicated significant improvements in process productivity and energy consumption as well as economic benefits to using the inserts. Regarding the significant considerations in realising the design, a recommendation on further strategic design rules and manufacturing process are highlighted so that the development of the insert using the selected approach can be more effective and efficient. Moreover, a utilisation of computer analysis software and further durability trial is also highlighted in order to predict and evaluate the optimum overall performance.
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Kočí, Ivan. "Návrh technologie výroby zátky z plastu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228882.
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This graduation theses analyse a concept of plastic plug production using the technology of injecting plastic into the form. There is performed a design of the technologic process with necessary calculations included here. Besides that the analysis is also focused on construction of the injection form. For the solution the 3D CAD system by SolidWorks and Hasco, Meusburger, Synventive normals were used. The graduation theses is finally valorized by technological-economic summary.
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Vyhnanovský, Jaroslav. "Návrh technologie výroby ozubeného kola z plastu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231960.
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This project has been developed within the master study of Engineering Technology and Industrial Management a design of manufacturing technology for plastic cogwheel is introduced. The cogwheel will be produced by plastic injection moulding. POM material with a trade name Delrin 100 NC010 from DuPont Company will be used. An injection mould is a tool for producing a plastic cogwheel using injection moulding technology. Production will take place on the machine Allrounder 420 C Golden Edition 1000-290 from Arburg German Company headquartered in Loßburg, where the seat of parent company is situated.
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Heralt, Aleš. "Technologie výroby plastového krytu mobilního telefonu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228862.
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The master´s thesis is focused on technology of injection plastics. The specified part is guard cover of mobile phone. The first part of thesis is focused on description of technology with priority on construction of form. The second part of thesis includes calculations of parameters, which are needed for production, along with techno-economic evaluation of selected construction design.
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Adamec, Lukáš. "Návrh technologie výroby plastové páčky." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228847.
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The aim of this project is to design the most suitable technology for manufacturing of the set component. The project contains theoretical and practical part. The theoretical part deals with division of polymer material and the description of the technology suitable for production of the set component. The practical part concentrates on the mould design of the set component including calculations and needed technological parameters of injection moulding operation.
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Lisspers, André. "Konstruktionsutvärdering och optimering av strögrep." Thesis, Uppsala universitet, Tillämpad mekanik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-295631.
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This thesis describes the optimization process for the pitchfork developed by the company Sverigegrepen. The work was done at the department of Applied Mechanics at Uppsala University. The project were handed by Ångström Materials Academy together with Sverigegrepen The work included a major prestudy of plastic construction, plastic materials, plastic injection and strength of materials. By applying the laws of beam theory, a mathematical expression could be provided, explaining the behaviour of the pitchforks teeth. By studying the pitchfork with tools such as 3D- CAD and FEA-simulations, an area where high concentrations of stress were found, an area known to have frequent issues with strength. From this data several concepts were created with an increased strength and a better distribution of stress. The plastic material was evaluated and tested to find the most valuable material characteristics. The provided information was used to isolate different functions in plastic materials, which is crucial for the pitchforks further functionality.
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Birch, Adrian John. "Copolyureas formed by reaction injection moulding, RIM." Thesis, University of Manchester, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.261898.
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Wang, Bo. "Integrated analyses in plastics forming." Thesis, Sheffield Hallam University, 1996. http://shura.shu.ac.uk/19363/.
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This is the thesis which explains the progress made in the analysis, simulation and testing of plastics forming. This progress can be applied to injection and compression mould design. Three activities of plastics forming have been investigated, namely filling analysis, cooling analysis and ejecting analysis. The filling section of plastics forming has been analysed and calculated by using MOLDFLOW and FILLCALC V. software. A comparing of high speed compression moulding and injection moulding has been made. The cooling section of plastics forming has been analysed by using MOLDFLOW software and a finite difference computer program. The latter program can be used as a sample program to calculate the feasibility of cooling different materials to required target temperatures under controlled cooling conditions. The application of thermal imaging has been also introduced to determine the actual process temperatures. Thermal imaging can be used as a powerful tool to analyse mould surface temperatures and to verify the mathematical model. A buckling problem for ejecting section has been modelled and calculated by PATRAN/ABAQUS finite element analysis software and tested. These calculations and analysis are applied to the special case but can be use as an example for general analysis and calculation in the ejection section of plastics forming.
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Sharp, D. A. "Computer monitoring and analysis of thermoset injection moulding." Thesis, University of Bradford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.483047.
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De, Kock Willem Johan. "Numerical simulation of the plastics injection moulding process." Doctoral thesis, University of Cape Town, 1994. http://hdl.handle.net/11427/18307.
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The Hele-Shaw formulation is widely used for the simulation of the injection moulding process. The influence of the Hele-Shaw approximations is, however, unknown. A two-dimensional numerical model based on the Hele-Shaw formulation, and a model based on the Navier-Stokes equations without the Hele-Shaw approximations were developed. The solutions obtained with these two approaches were compared to investigate the influence of the Hele-Shaw approximations on the simulation of the injection moulding process. Weakly compressible, non-Newtonian flow of an amorphous polymer melt under non-isothermal conditions were simulated using constitutive equations generalized to non-Newtonian materials. The finite volume method, which is a very powerful method yet easy to use, was used to discretize the governing equations as compared to finite element methods used in most other reported models. The influence of the Hele-Shaw approximations on the solutions of specific flow cases was determined by comparing the solutions obtained with the model based on the Hele-Shaw formulation and the model based on the Navier-Stokes equations. Parametric studies were done to compare the solutions of the two numerical models for a wider range of flow cases. The following conclusions were made as a consequence of this study: Numerical models to simulate the injection moulding process can be simplified and the computer time required to solve these models can be reduced by using the Hele-Shaw formulation instead of solving the full Navier-Stokes equations. Numerical models based on the Hele-Shaw formulation are well suited to simulate the injection moulding process when the geometries and flow conditions fall within certain limits. These limits are determined by the combined effect of the geometry and the flow conditions represented by the Reynolds number. The simplicity of the finite volume method used in the generalized Hele-Shaw model makes it an attractive model to use for injection moulding simulations.
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Manero, Federico. "Cavity temperature measurement and control in thermoplastics injection moulding." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=27241.
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Injection moulding is one of the most important manufacturing processes in the plastic industry. The temperature distribution of the polymer, while it is inside the mould cavity, influences the properties of the product. The measurement and control of these temperature profiles can enhance the economy of the process and the part quality.A method to measure melt temperature inside the mould cavity was developed. It consists of an insert, located in the movable plate, that can place thermocouples at different positions. The depth of the thermocouple tip is adjusted manually. These sensors offer an attractive way to perform the measurements because of their easy calibration procedure. The temperature measurements were influenced by the thermocouple tip geometry.
Data were collected at different locations and depths of the mould cavity and the temperature profiles were analyzed. The temperature distribution depended on the wall temperature and the temperature of the polymer as it enters the cavity. The effect of different flow rates was also studied and it demonstrated to affect the temperature profiles.
A control algorithm was developed to control the average of the peak temperatures at three locations in the cavity. The manipulated variable was the coolant temperature and the process disturbance was the front barrel temperature. The transfer functions of the controlled variable with respect to the manipulated and disturbance variables were identified and modeled.
Finally two controllers were designed, tuned, simulated and implemented on the machine. The first is a static feedforward - feedback controller, and the second is a dynamic feedforward - feedback controller. The feedback loop was designed using an internal model control (IMC) algorithm. The static feedforward - feedback controller was found to have a better performance.
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Ramírez, Domínguez Edgar C. "Optical sensing of thermoplastics solidification in an injection moulding machine." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0024/MQ50654.pdf.
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McClelland, Alan Nigel Robert. "The injection moulding of long glass fibre reinforced thermoplastic materials." Thesis, University of Liverpool, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235520.
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Fusser, Harry B. "A man-machine interface for PC-controlled injection moulding /." Thesis, McGill University, 1991. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=60686.
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In parallel to the development of a PC-control system for injection moulding, a workable user interface for man-machine communication was developed.The hardware includes an IBM PC/AT, PS/2 model 70. A real-time multi-task operating system, QNX 4.0 (Quantum Software Sys. Ltd.) was installed to run applications programmed in the language C (WATCOM Sys. Inc.).
A top-down structure was adopted, comprising menus, warnings, and directives.
The user interface includes three tasks to run concurrently, the main-task, the real-time machine-status display task, and the task to display the current barrel-heater temperatures.
Four controller types, a digital PID and three discrete controllers, the total of cycles for the machine to run, and operating modes can be specified by scrolling sub-menus.
All data processed on the loading, editing, and saving level, are character strings that will be converted to appropriate data types just before machine activation.
Inter-task communication is accomplished by sharing global memory segments between display tasks and the tasks in charge for data acquisition and control.
The interface tasks do not exert a large claim on system resources.
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Rojananan, Surasit. "Injection moulding of glass fibre phenolic plastics with modified interphases." Thesis, University of Sheffield, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.408299.
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Ogbonna, Charles Iroha. "Production of self-reinforced polyethylene using the multi live-feed (injection) moulding technique." Thesis, Brunel University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.277646.
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Cushley, Anna T. "The prediction of fibre orientation in short fibre reinforced thermoplastic injection mouldings." Thesis, Cranfield University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.281060.
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Hung, Wai-chi. "The flow of polymer melts in the mould in injection moulding /." [Hong Kong : University of Hong Kong], 1991. http://sunzi.lib.hku.hk/hkuto/record.jsp?B13206187.
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熊偉志 and Wai-chi Hung. "The flow of polymer melts in the mould in injection moulding." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1991. http://hub.hku.hk/bib/B31210338.
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Schiffers, Reinhard, Georg P. Holzinger, and Gernot Huster. "Adaptive process control for stabilizing the production process in injection moulding machines." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-200201.
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Plastic injection moulding machines are a positive example of the possibilities in terms of performance and energy efficiency of modern hydraulic drives technology. In addition to the performance and energy efficiency of the machines, the quality of the plastic mouldings and an easy to use machines control is the focus. To ensure a constant plastics part quality the set process parameters of the injection moulding machines are kept constant by appropriate closed loop control strategies today. Assuming a constant quality of the processed plastic raw material, this strategy is effective. If it comes to a qualitative variation in the processed plastics, which often leads to a change in viscosity of the plastics melt, keeping processing parameters constant will not lead to a constant quality of the moulded parts. The deviations in the plastics viscosity have such a great influence on the moulding process that the relevant process parameters have to be adjusted manually in many cases. Often the stroke of the reciprocating screw system has to be adapted to reach a constant filling volume of the cavity and therefore avoid burr formation or short shots. In this paper an approach for adaptive process control is introduced. This control loop is able to correct the set points of specific machines parameters online within the production cycle and therefore is able to avoid changes in the produced parts quality.
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Ozden, Sedat. "Influence of process-induced stresses on the mechanical behaviour and dimensional stability of thermoplastic injection mouldings." Thesis, University of Ulster, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386074.
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Burns, Mara Georgieva. "Mechanical properties and compostability of injection-moulded biodegradable compositions." Diss., Pretoria : [s.n.], 2008. http://upetd.up.ac.za/thesis/available/etd-01192009-093817/.
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Rawson, Keith William. "Shear controlled orientation effects with injection mouldings produced by the SCORIM process." Thesis, Brunel University, 1997. http://bura.brunel.ac.uk/handle/2438/6380.
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Injection moulding using the process of Shear Controlled Orientation Injection Moulding (SCORIM) to enhance the aesthetic characteristics of plastics was investigated. Unsightly surface weld lines were successfully removed from highly reflective aluminium flake pigmented plastics by the application of a single macroscopic SCORIM shear when used in series with Bright Surface Moulding (BSM). A gonio spectrophotometer (GSP) was used for the quantitative characterisation of the Al flake pigmented mouldings as a measure of surface reflectivity and preferred angle of reflection. The different directional properties of surface reflectivities to either side of a conventional weld line are unacceptable, but were successfully reoriented approximately uniformly with the use of SCORIM and BSM moulding (i. e. SBM) used in series. SBM therefore provided an acceptable quality of surface finish for mouldings originally containing a weld line, without deterioration of mechanical properties. Indeed, some improvements in mechanical properties were observed. Translucent two-colour mouldings were used to successfully demonstrate the flow paths taken by sheared material during the application of macroscopic shears. The use of intermittent shearing to encapsulate shear oriented material in the solidifying layers, manifested original and profound aesthetic effects. This resulted from mixing the two colours and was reproducible and widely variable. The morphology of isotactic polypropylene (iPP) processed in this way and examined by light and electron microscopy revealed how only one or two intermittent shears were required to orient a large volume of the moulding in the shear direction. Moreover, U-shaped flow paths demonstrated that the easiest shear route was close to the mouldings edges, an observation supported by x-ray analysis. The addition of Al flake pigment was found to act as a heterogeneous nucleant for ß-spherulites. This acted as a suitable marker for the clear identification of the displaced weld interface using polarised light microscopy, of filled and unfilled iPP. y-phase was identified with the use of only one or two intermittent shears which reflects an increase in molecular alignment and consequent improved mechanical properties. The intensity of the y-phase increased with the volume of material sheared. Strong evidence was also obtained of a linear relationship between the logarithm of the time lapse between two intermittent shears and the corresponding values of a-phase index, crystallinity index and percentage crystallinity. The values of each increasing proportionally with the length of time used. Microhardness characterisation revealed anisotropy within SCORIM samples consistent with preferred orientation and increased modulus in the shear direction. The skin layers were characterised as the softest region through the thickness of SCORIM mouldings. The results of this work were used to provide the basis of a computer simulation of the SCORIM process under development at the University of Wales Swansea.
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Dluhoš, Jan. "Technologie výroby plastového tělesa clony." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230864.
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This thesis deals with the production of a plastic body of the aperture by the method of injection moulding. The work includes a design of the injection mould for the given component. First, an appropriate material for the moulded piece was chosen and then the necessary calculations for the injection mould were made. A quadruplex injection mould with a heated inlet nozzle and pullout cores was designed based on these calculations. Modular components were chosen when designing the injection mould. The next part of the thesis contains the selection of the injection moulding machine for the given mould. The conclusion contains a technical-economical evaluation including the cost estimating for the injection mould and cost estimating for one moulded piece.
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Goussard, Charl Leonard. "Design analysis of a lomolding machine." Thesis, Link to the online version, 2007. http://hdl.handle.net/10019.1/1199.
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Thériault, France. "Optimized design of a composite helicopter structure by resin transfer moulding." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=99795.
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This research project is partnership project involving industrial, university and government collaborators. The overall objective is to develop and enhance tools for use in Resin Transfer Moulding (RTM) design technology in order to re-design existing metallic parts using composite materials.The specific objective of this work is to present preliminary research findings of the development of an optimized design of a leading edge slat (horizontal stabilizer component) from the Bell Model 407 Helicopter. The results presented here focus on the static stress analysis and the structure design aspects. The findings will serve as a basis for future design optimization as well as further developments in the use of RTM technology in re-designing metallic aeronautic components and can be considered to be "semi-optimized".
This research is based on extensive finite element analysis (FEA) of several composite material configurations, with a comparison made with the original metallic design. Different key criteria of the part design such as ply lay-up, bracket geometry, angle and configuration are tested using FEA technology with the objective of selecting the design which is minimizing stress concentrations. The influence of the modification of model-related parameters was also studied.
Preliminary comparative studies show that the slat configuration with half brackets opened towards the inside with an angle of 70 degrees (angle between the top of the airfoil and the side of the bracket) is the best option according to minimum stress concentration and structural flexibility. This choice is confirmed by other factors such as material savings and ease of processing.
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Moammer, A. A. "Thermal management of moulds and dies : a contribution to improved design and manufacture of tooling for injection moulding." Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6652.
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Thesis (PhD (Industrial Engineering))--University of Stellenbosch, 2011.ENGLISH ABSTRACT: Injection moulding of polymer components is subject to ever increasing demands for improved part quality and production rate. It is widely recognised that the mould cooling strategy employed is crucial to achieving these goals. A brief overview of injection moulding units and different types of injection moulds is given. The modern Additive Manufacturing (AM) technology for processing metal powders such as Direct Metal Laser Sintering (DMLS) and Selective Laser Melting (SLM) offers almost full freedom to the mould designer. Some of these modern manufacturing methods based on metal powders, which are able to produce complex cooling channels are analysed. A drastic change has entered the mould design domain - shifting the paradigm from design for manufacture to manufacture for design. In combination with suitable AM methods the concept of surface cooling moulds can now be efficiently implemented. This study presents a new approach of predicting the minimum cooling time required for the produced part. Different cooling layouts are analysed taking the heat transfer into consideration. The lumped heat capacity method is implemented in this research in order to determine the minimum cooling cycle time required. A new approach was developed to determine the most suitable cooling layout configuration, such as conventional cooling, conformal cooling or surface cooling, required for a moulded part based on its characteristics such as shape complexity, space available for the cooling layout, part quality requirements, production volume, and product life cycle. A mould cooling design process including simulation, reverse engineering and manufacturing of the mould insert was implemented in this study. In order to validate the generic model developed during the course of this research comparative experiments were carried out to determine the difference in performance of injection moulding using conventional or surface cooling methods. The experimental results showed a significant improvement in part quality produced with reduced cycle times using the surface cooling method.
AFRIKAANSE OPSOMMING: ‘Injection Moulding’ van polimeer komponente word al meer gedruk vir verbeterde kwaliteit en vinniger produksie tyd. Dit is orals bekend dat die gietvorm afkoeling strategie ‘n groot rol speel om hierdie twee doelwitte te bereik. Eers word ‘n kort oorslag gegee van ‘Injection Moulding’ eenhede en van verskillende ‘Injection Moulding’ vorms. Die moderne Aditatiewe Vervaardigingstegnologie vir die prosessering van metaal poeiers soos bv. Direkte Metaal Laser Sintering (DMLS) en Selektiewe Laser Smelting (SLM) bied basies volle vryheid ten opsigte van gietvorm ontwerp. Party van die moderne vervaadigings metodes, wat op metaal poeiers gebaseer is, wat komplekse koelings kanale kan produseer word geanaliseer. Die ontwerpers arena het ‘n groot verandering ondergaan deurdat die fokus van ontwerp vir vervaardiging verskuif het na vervaardiging vir ontwerp. In kombinasie met toepaslike aditatiewe vervaardigings metodes kan oppervlak verkoeling nou effektief geïmplementeer word. Hierdie studie bied a nuwe manier om die minimum verkoelings tyd benodig vir ‘n part te voorspel. Verskeie verkoelings uitlegte word geanaliseer waar hitte oordrag in ag geneem word. Die “lumped heat capacity” metode word gebruik om die minimum siklus tyd te bepaal. ‘n Nuwe benadering is ontwikkel om die mees geskikste verkoelings uitleg soos bv. konvensionele verkoeling, konvorme verkoeling of oppervlak verkoeling te bepaal vir ‘n spesifieke part gebaseer op die part se vorm kompleksiteit, spasie beskikbaar vir verkoelings kanale, kwaliteit vereistes en produk lewensiklus. Die volgende is in die studie geïmplementeer: ‘n vorm verkoelings ontwerp proses met simulasie, ‘reverse engineering’ en vervaardiging van die vorm insetsel. Om die generiese model te verifieer gedurende die studie is vergelykende eksperimente uitgevoer om die verskil in prestasie te bepaal tussen die gebruik van konvensionele en oppervlak verkoelings metodes. Die eksperimentele resultate het ‘n beduidende verbetering in part kwaliteit getoon met ‘n verkorte siklus tyd tydens die gebruik van die oppervlag verkoelings metode.
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Nosek, Jan. "Návrh technologie výroby tělesa světlometu motocyklu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229143.
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The thesis is a proposal technology of the main body of motorcycle polymer material from Bayer's APEC - high temperature polycarbonate 1703. Literary study summarizes findings from a thermoplastic injection molding technology and the possibilities of structural design of injection molds, plastic plating technology from a focus on the most important technology in the field of lighting technology vehicles. Given the anticipated production run of 50 thousand. pieces are assessed a total of 2 variants of the molding parts. The practical part was modeled and specified product designed mold. Construction was done by using SolidWorks 2007 software and normalities FCPK Bytów and HASCO. For the selected option is implemented technological calculations. For the proposed technology was chosen Allrounder injection molding machine 570 A the manufacturer Arburg designed and suitable technological process of production.
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Elsheikhi, Salah A. "A holistic approach to injection moulding optimisation for product quality and cost through the characterisation of reprocessed polymeric materials and process monitoring : experimental evaluations and statistical analysis of multiple reprocessing of unfilled and short glass fibre filled polypropylene materials : an optimised methodology to realise minimum product cost at an acceptable product quality." Thesis, University of Bradford, 2011. http://hdl.handle.net/10454/5405.
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The plastics industry is one of the fastest growing major industries in the world. There is an increase in the amount of plastic used for all types of products due to its light weight and ability to reprocess. For this reason, the reprocessing of thermoplastics and the usability of reprocessed materials are gaining significance, and it is important to produce and consume plastic materials in an environmentally friendly way. In addition, rising raw material cost linked to the increased oil prices encouraged for reusing of the plastic materials. The aim of this research was to study and optimize the injection moulding process parameters to achieve a trade-off between the product cost and product quality, measured through mechanical properties and geometry, based on using regrind ratios. The work was underpinned by a comprehensive study of multiple reprocessing effects in order to evaluate the effect of process parameters, material behaviour, reprocessing effects and possible links between the processing parameters and key properties. Experimental investigations were carried out, in particular, focused on the melt preparation phase to identify key process parameters and settings. Multiple reprocessing stages were carried out; using two types of PP material: unfilled and short glass filled. A series of tests were used to examine product quality (mass, colour and shrinkage) and physical properties (density, crystallinity, thermal stability, fibre length, molecular weight, in-line and off-line viscosity, tensile strength, modulus of elasticity, elongation (%) and flexural strength). This investigation showed that the mouldability of the filled and unfilled PP materials, through the successive reprocessing stages (using 100 % regrind), was observed to be relatively consistent. Given the link between the processing parameters and key product and material properties, it is possible to manufacture products with minimal loss to part quality and mechanical properties. The final phase of the work focused on process optimisation study for short glass fibre filled PP material and the identified key process parameters (melt temperature, screw rotational speed, holding pressure, holding time and injection rate). A response surface experiment was planned and carried out for three reprocessing stages (0 %, 25 % and 50 % regrind). The fitted response surface models were utilised to carry out the trade-off analysis between the operating cost (material cost, energy cost and labour cost) and product quality (dimensions and tensile strength) Based on the optimal moulding conditions, the operating cost was reduced (from stage I as a reference), by 24% and 30 % for stage II and stage III respectively. A small, perhaps undetectable, change in product dimensions was noted. In addition, a small reduction in tensile strength was noted (from stage I as a reference), by 0.4% and 0.1 % for stage II and stage III respectively. The same data was applied in other countries (Australia, USA, Brazil, Libya and China) to manufacture the same product; and it was observed that the cost was reduced with increasing of regrind ratio. But the significant reduction of the cost, essentially, depended on those countries which have low wage rates (e.g. Brazil, Libya and China). For example, the cost of moulded product manufactured in China is £ 0.025 (using 50% of regrind), while the cost of the same product produced in Australia is £ 0.12, hence giving a total saving of 79 % and making it a valuable issue to be considered in industry.
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Höer, Martin. "Einfluss der Material- und Verarbeitungseigenschaften von Phenolharzformmassen auf die Qualität spritzgegossener Bauteile." Doctoral thesis, Universitätsbibliothek Chemnitz, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-155078.
Full textAbstract:
Spritzgießbare Duroplaste zeichnen sich durch hohe thermo-mechanische Beständigkeit, geringe Schwindung und niedrige Materialkosten aus. Damit können die Anforderungen an spritzgegossene Präzisionsbauteile für den Automobilbau erreicht werden. Im Rahmen der vorliegenden Arbeit werden unterschiedliche Novolak-Phenolformmassen hinsichtlich ihres hygroskopischen Verhaltens und dessen Auswirkung auf die Spritzgießverarbeitung und die Bauteilqualität untersucht. Das Absorptionsverhalten kann mithilfe der Fick’schen Diffusionsgesetzte näherungsweise beschrieben werden. Auf Basis von mechanischen Untersuchungen sowie der Beurteilung der Maßhaltigkeit eines Präzisionsdemonstrators hinsichtlich Schwindung und Verzug wird zudem der Einfluss der Prozessparameter beim Spritzgießen bestimmt. Die vorgestellten Untersuchungen zeigen die Grenzen der Verarbeitung und der realisierbaren Bauteilqualität auf, die auf die großserientaugliche Verarbeitung von duroplastischen Bauteilen übertragen werden könnenInjection moldable thermosetting materials show excellent material properties, e.g. high thermo-mechanical resistance and reduced shrinkage in combination with low material cost. Thus, technical requirements for high performance parts for automotive applications can be achieved. In the scope of this work different phenolic novolac compounds were investigated regarding their hygroscopic behavior with its influence for injection molding and product quality. The absorption can be approximately described by Fick’s-Diffusion-Model. The interrelationship of injection molding parameters and the thermo-mechanical behavior is examined on the basis of mechanical testing and the assessment of the dimensional accuracy for a thermoset high precision part. The presented investigations point to the limit of processing and realizable part quality which can be transferred for high performance parts molded in mass production
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Huang, Chiung-Feng, and 黃瓊鋒. "A Study on Injection Performance for All-electric Plastic Injection-moulding Machine." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/24481480288805171684.
Full textAbstract:
碩士國立高雄第一科技大學
電機工程研究所碩士班
102
There are many plastic products used in our daily life, as well as in many industries. In recent years, due to the issues of saving resource and the requirement of high precision in non-traditional industry, all-electric plastic injection-moulding machine has become the trend. This research is focus on how to improve the injection performance for all-electric plastic injection-moulding machine. To have better injection performance, deep understand of the physical dynamic characteristics of all-electric plastic injection-moulding machine during the injection process is required, for which a dynamic model for the injection unit was constructed in this research. Many factors may affect the injection performance, among which the problem of pressure surge during the transition from injection to packing is the most critical issue. To overcome this problem, this research proposed a novel method which switch from position control to pressure control with continuous control output and smoothly changed pressure command during the transition stage. The effectiveness has been shown with simulation and experimentation.
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李清貴. "Injection Moulding of a Plastic Bottle Cap with Inner Screw Thread." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/07168899045661265253.
Full textAbstract:
碩士國立中興大學
機械工程學系
87
ABSTRACT The technique of formation and unscrewing of a bottle cap with inner-thread in an injection mold is studied. The shrinkage of the bottle cap from injection molding with various packing pressures, mold and melting temperatures is analyzed. Two plastic materials, low density polyethylene (LDPE) and polypropylene (PP), are used in tests. Three plastics melting temperatures, 205℃,220℃ and 235℃, are considered. The minimum and maximum effective injection pressures and velocities are obtained and the results are represented on a P-V diagram. The optimum operating range is indicated. In the shrinkage analysis, the mold temperature individually is controlled at 30℃,45℃ and 60℃.The packing pressure is in the range 810 kg/cm2 to 1160 kg/cm2. The effects of pitch and screw thread depth on height, wall thickness, inner and outer diameters of the cap are investigated for various packing pressures, mold and melting temperatures. The measured shrinkage data of cap inner diameter and thickness are individually correlated in a polynomial equation. Four conventional devices for unscrewing of bottle cap in inner-thread die are discussed. The mold used in experiment is equipped with a chain-to-chain wheel unscrewing mechanism. keywords : melting temperature, shrinkage, injection mold, polyethylene, polypropylene。
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Morgan, Wani Jamaal, and 摩根. "Study of Performance Monitoring of a Plastic Injection Moulding Machine with Vibration Signal Analysis." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/2h8965.
Full textAbstract:
碩士崑山科技大學
機械工程研究所
106
Plastic injection moulding is a manufacturing process by which molten plastic material is injected into a mould and later solidifies to form moulded plastic parts. Due to growing industrial demand accelerated by competition, a major challenge is to efficiently and effectively mould products that meet specific quality attributes required by costumers. For such manufactured parts, geometrical appearance and part weight are two important measures of quality. Herein, a combination of Vibration Analysis and Artificial Neural Network is employed in a cost-effective manner to accurately predict the geometrical appearances and part weight of the moulded parts. Vibrational data was acquired by mounting an accelerometer on to the toggle pin bearing of the injection moulding machine. Analysing of the low frequency vibrational response of the injection period with a transfer function provided valuable information that was used as inputs to train, validate and test two feed forward artificial neural networks (ANN). The first ANN was used to classify the parts’ quality while the second ANN predicted the parts’ weights. The classification ANN had a 100% accuracy when classifying each injected part as either a normal shot, an over shot or a short shot. The second ANN predicted the weights of the injected parts with a maximum error value of 0.715%. This result outperformed the use of Support Vector Regression which had a maximum error of 6.287% as presented in a previous study. A significant contributing factor to the ANN’s relatively high performance is due to the fact that large amounts of vibrational signatures were extracted and used as inputs to the neural network.
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Wang, Po-Hsiang, and 王伯祥. "Applications of Toyota Just -In -Time Concepts for Improving Plastic Injection Moulding Machine Production Systems." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/r72mb4.
Full textAbstract:
碩士國立虎尾科技大學
機械與機電工程研究所
95
Abstract There has been full of inefficiency and waste in current operation method of plastic injection moulding machine industries. This study attempts to utilize Toyota just-in-time system for the fabrication of plastic injection moulding machine to eliminate operational waste in production processes. The main objective of this study is take a work case company as an example to discuss the following respects: 1.The current production process of plastic injection moulding machine industries. 2.The application of Toyota Just-in-time Production System in the plastic injection moulding machine fabrication. In order to achieve the goal﹐this study first introduces the framework of Toyota Just-in-time System to explain the concept and advantage of Toyota Just-in-time System explicitly. Also, this study compares Toyota Just-in-time Production System with current production method used in current plastic injection moulding machine industries. Secondly, according to the glancing of related references, this study discusses the application method and the profit for intvoducing Toyota Just-in-time System in the manufacturing industries. As there are significant differences in operation method between plastic injection moulding machine industries and manufacturing industries, thus this study utilizes gradual erection plan to match Toyota Just-in-time System in fabrication﹐process plan to eliminate distinction between two different industries in addition to explain necessary rationalized operation when Toyota Just-in-time System is introduced. Having visited the production line and made mutual communication with operation (devision) chief, this study has identifed many existing problems in production management in the wark case company. According to the findings, this study employed a small machine assembly as pilot implementation to discuss the possible question and solution policy for Toyota Just-in-time System asapplied in plastic injection moulding machine so as to frame the procedures and criterion of Toyota Just-in-time System in fabrication of plastic injection moulding machine﹐ and also to evaluate its profit. Key words: Plastic injection moulding machine, Toyota Just-in-time Production System, fu chun shin, JIT, pull-type production System.
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Chou, Yueh Feng, and 周岳鋒. "The Cooling System Design and Analysis of Aluminum-Filled Epoxy Rapid Tooling for Plastic Injection Moulding." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/93349633887004001781.
Full textAbstract:
碩士國立高雄應用科技大學
模具工程系
98
Due to the global competition and customization of the products, industry is now under higher pressure to engage on and to advance manufacturing processes that can provide flexibility and cost savings to comply with the customers’ requirements for limited production mass and ever-changing details for the products. In this paper, the study of rapid soft tooling technology for injection molding is presented. The first objective is to propose an approach to integrate rapid prototyping (RP) and rapid tooling (RT) technology in the course of plastic injection moulding and to investigate the conformal cooling effect on aluminum-epoxy mould. The proposed aluminum-epoxy mould was made by room temperature vulcanization (RTV) silicon mould. Due to the low thermal conductivity of epoxy, it is expected that the cycle time should be lengthened to permit the part to cool in the mould prior to removal. However, this will increase the production cost. Therefore, the second objective is to determine an efficient conformal cooling channel configuration. In this research, 9 different cooling system configuration are analyzed to find out the most efficient cooling system on aluminum epoxy mould. Thereafter, the analysis result is applied to experimental mould for comparison. Experimental and analysis results show a cooling system layout with 6 mm diameter cooling channel, a distance of 8mm from the mould inner surface to the channel, and a distance of 30mm between the cooling channels was found to have a lowest average temperature of 60.2℃ among 9 different groups. This configuration is in the ratio of 1:1.3:5 (6:8:30) compared with the experienced ratio of 1:3:5 in the conventional steel mould. The cycle time is the same with the conventional steel mould of 30 second. The analysis results show a good agreement with experimental results.
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Wang, June-Jay, and 王俊傑. "Strategic Groups and Business Performance : An Empirical Investigation of Plastic Injection Moulding Machine Industry in Taiwan." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/23728599974734696917.
Full textAbstract:
碩士國立中興大學
企業管理學系
85
This investigation was empirically based and examined strategic groups and their performance of 39 Taiwan plastic injection moulding machine manufacturers.This study included five purpose : 1.To illustrate the overall situation of Taiwan plasticinjection moulding machine industry. 2.To identify whether there are strategicgroups in Taiwan plastic injection moulding machine industry. 3.Todescribe the strategic behavior of the strategic groups.4.To explore the relationships between strategic groups and the background of firms.5.To explore the performance differences among strategic groups in Taiwan plastic injection moulding machine industry. This study designed a questionnaire with 23 strategic variables and 3 performancevariables.Then use the following statistical methods to analysis : 1.factor analysis 2.cluster analysis 3.discriminant analysis 4.one-way MANOVA 5.one-way ANOVA 6.duncanmultiple-range test 7.chi-square test.The results of the study indicate that :1.Four groups can be identified in Taiwan plastic injection moulding machine industry : (1) the differentiation strategy (2) the cost control strategy (3) the cost focus strategy (4) the reactive strategy2.Eight strategic dimensions can be identified by factor analysis and there were significant differences among strategic groups in "product- market factor","production input factor","differentiation factor","marketing factor","price factor" and "specialization factor".3.The group of reactive strategy were large,senior and famous firms.The group of costcontrol strategy were small firms. The group of cost focus strategy were middle firms. 4.There were significant differences among strategic groups in ROA and profitability. The group of reactive strategy has higher performance while differentiation strategy has inferior profitability and cost control strategy has inferior sales growth rate.
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Kumar, Kotha Vinod. "Subtractive and additive manufacturing technology in moulding industry." Master's thesis, 2016. http://hdl.handle.net/10400.8/2148.
Full textAbstract:
This report is a review of additive and subtractive manufacturing
techniques. This approach (additive manufacturing) has resided
largely in the prototyping realm, where the methods of producing
complex freeform solid objects directly from a computer model
without part-specific tooling or knowledge. But these technologies are
evolving steadily and are beginning to encompass related systems of
material addition, subtraction, assembly, and insertion of components
made by other processes. Furthermore, these various additive
processes are starting to evolve into rapid manufacturing techniques
for mass-customized products, away from narrowly defined rapid
prototyping. Taking this idea far enough down the line, and several
years hence, a radical restructuring of manufacturing could take place.
Manufacturing itself would move from a resource base to a
knowledge base and from mass production of single use products to
mass customized, high value, life cycle products, majority of research
and development was focused on advanced development of existing
technologies by improving processing performance, materials,
modelling and simulation tools, and design tools to enable the
transition from prototyping to manufacturing of end use parts.
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Seo, Jaho. "Thermal Management in Laminated Die Systems Using Neural Networks." Thesis, 2011. http://hdl.handle.net/10012/6249.
Full textAbstract:
The thermal control of a die is crucial for the development of high efficiency injection moulds. For successful thermal management, this research provides an effective control strategy to find sensor locations, identify thermal dynamic models, and design controllers. By applying a clustering method
and sensitivity analysis, sensor locations are identified. The neural network and finite element analysis techniques enable the modeling to deal with various cycle-times for the moulding process and uncertain dynamics of a die. A combination of off-line training through finite element analysis and training using on-line learning algorithms and experimental data is used for the system
identification. Based on the system identification which is experimentally validated using a real system, controllers are designed using fuzzy-logic and self-adaptive PID methods with backpropagation (BP) and radial basis function (RBF) neural networks to tune control parameters. Direct adaptive inverse control and additive feedforward control by adding direct adaptive inverse control to self-adaptive PID controllers are also provided. Through a comparative study, each controller’s performance is verified in terms of response time and tracking accuracy under different
moulding processes with multiple cycle-times. Additionally, the improved cooling effectiveness of the conformal cooling channel designed in this study is presented by comparing with a conventional straight channel.