Wyniki wyszukiwania - BazTech

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Optymalizacja wtrysku wspomaganego gazem z wykorzystaniem symulacji procesu w programie Autodesk Moldflow Insight®

Heneczkowski M., Kawa M.

Mechanik

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2015

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R. 88, nr 4

285--287

PL

Wykonano komputerową symulację wtrysku wspomaganego gazem w programie Autodesk Moldflow Insight®; jej celem była optymalizacja warunków prowadzanego procesu. Do analizy wykorzystano dwa typy poliamidu 6 (Tarnamid T-27 i Tarnamid T-27 30GF) oraz polioksymetylen typu Tarnoform 300. Wyniki analizy pozwoliły na określenie optymalnego momentu przełączenia z wtrysku tworzywa na wtrysk gazu. Stwierdzono również, że dla analizowanych tworzyw na łatwość wypełniania gniazda większy wpływ ma temperatura wtrysku niż temperatura formy.

EN

Computer simulation of gas-assisted injection molding using Autodesk Moldflow Insight® was performed to optimize the processing. Two types of polyamide 6 (Tarnamid T-27, Tarnamid T-27 30GF) and polioksymethylene Tarnoform type 300 were used. Results of the analysis work provide for positive identification of the most effective melt-to-gas injection switch-over instant. It was also found that in case of this particular plastic, the melt temperature is of more importance than the mold temperature itself on the cavity filling effect.

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Badania dyfuzyjności gazu w procesie wytwarzania wyprasek metodą wtryskiwania wspomaganego gazem

Postawa P., Stachowiak T.

Zeszyty Naukowe Politechniki Poznańskiej. Budowa Maszyn i Zarządzanie Produkcją

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2010

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Nr 12

287-290

PL

W artykule przedstawiono wyniki badań dyfuzyjności gazu do wypraski w procesie wtryskiwania wspomaganego gazem. Jest to zjawisko zależne w dużym stopniu od warunków przebiegu procesu technologicznego, związanych głównie z temperaturą wtryskiwanego tworzywa oraz czasem przełączenia wtrysku gazu i prędkości jego wtryskiwania. Dyfuzja gazu do wypraski znacząco wpływa na właściwości wypraski (głównie jej sztywność), jak również na strukturę i rozkład masy. Wyniki otrzymanych badań przedstawiono w postaci fotografii przekrojów przez poszczególne sekcje otrzymanych podczas prób wyprasek. Wypraski były wytwarzane w firmie Anitex P.P.H. w Częstochowie.

EN

Research of gas diffusion in Gas Assisted Injection Moulding process was presented in' paper. Gas diffusion in GAIM process is complex phenomena and depended of many factors. 1 temperature and gas injection time has big influence on gas diffusion and on the shape, dimen of gas gap in melt polymer around gas core. Result of research were presented as a photo of; section of mouldings produced in different conditions. Gas diffusion has an influence on mec1 cal properties (stiffness, hardness) of mouldings, so authors are going to make a future resea that area and compare future results with presented in that paper. Samples using for research taken from real commercial process in one of plastic processing company ANITEX Comp. Częstochowa, POLAND.

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Structure of gas-assisted injection moulded parts

Stachowiak T., Jaruga T.

Journal of Achievements in Materials and Manufacturing Engineering

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2010

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Vol. 38, nr 2

139-145

EN

Purpose: The purpose of this research was evaluation of the structure in the cross-section of gas-assisted injection moulded parts. The parts investigated were stroller handles made from polypropylene. Design/methodology/approach: Polymer structure was observed in the cross-section using the optical microscope. The microtomed slices cut from the manufactured parts were observed in polarized light. The parts obtained with different injection moulding temperature values were tested. Findings: was found that spherulites size differs in the cross section. A big gradient of spherulites is observed in the area near the skin while the spherulites contacting the gas channel are of similar size - like those in the part centre. Research limitations/implications: The investigation is limited to semi-crystalline polymers, like polypropylene. In case of amorphous polymers spherulitic structure does not occur. Practical implications: The investigation results can contribute to the improvement of the knowledge about gas-assisted injection moulding and can also be helpful in selection of proper injection moulding parameters, in order to obtain good polymer structure in the part. Originality/value: Gas-assisted injection moulding is a non-conventional manufacturing process. Investigation in this field is not so common like in conventional injection moulding that has much longer history.

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Influence of the processing conditions on the dynamic mechanical properties of gas assisted injection moulded parts

Postawa P., Stachowiak T., Jaruga T.

Archives of Materials Science and Engineering

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2010

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Vol. 44, nr 2

104-111

EN

Purpose: The main purpose of this research was the estimation of the influence of processing conditions on dynamic mechanical properties moulidings made by Gas-Assisted Injection Moulding technology (GAIM). The research samples were cut from children cart holder - part made by gas-assisted injection moulding and tested using DMTA method. Design/methodology/approach: One of the modern testing methods was used - Dynamic Mechanical Thermal Analysis which is used very often to determinate dynamic mechanical properties and transformations of the structure of polymers and composites as well as parts manufactured from these materials. Findings: The impact of processing conditions used for manufacturing the parts made by gas-assisted injection moulding technology on mechanical properties of these parts were examined. The differences in storage modulus E' and loss factor tand were investigated. During the tests three of processing conditions were changed, on the base of the experimental plan generated in STATISTICA software, in Design of Experiment module. Research limitations/implications: The differences in storage modulus - E' and mechanical loss factor tgd were presented. The research carried out was limited to one material (Copolymer of polypropylene and polyethylene PP/PE included 10-14% of PE fraction) however during investigations some of processing conditions were changed. Practical implications: Received and presented results are very useful from the point of view of industrial applications and they can contribute to the quality improvement of the parts obtained using gas-assisted injection moulding technology. Gas flow in melt polymer in GAIM technology is very unpredictable and it causes many defects in produced parts. Originality/value: A new approach to the estimation of mechanical properties of moulded parts, produced using GAIM technology, gives information about the influence of the processing conditions on mechanical properties and quality of the parts.

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Wybrane właściwości wyprasek wytwarzanych metodą wtryskiwania wspomaganego gazem

Bociąga E., Stachowiak T.

Czasopismo Techniczne. Mechanika

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2009

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R. 106, z. 1-M

23-29

PL

W artykule przedstawiona została metoda wtryskiwania wspomaganego gazem oraz analiza wybranych właściwości wyprasek wytwarzanych tą metodą. Badania zostały przeprowadzone w ścisłej współpracy z przemysłem. Wykazano, iż temperatura wtryskiwanego tworzywa, czas przełączania oraz czas wtrysku gazu znacząco wpływają na masę oraz grubość ścianki wyprasek.

EN

Gas - assisted injection moulding technology and analysis of selected properties of moluded parts were presented. Experiments were carried out with a close cooperation with the industry. It was found that injection moulding temperature, switching time and gas injection time influenced significantly mass and wall thickness of parts.