Analysis of numerical modeling strategies to improve the accuracy of polymer injection molding simulations

Miranda, Diego Alves de; Rauber, Willian Kévin; Vaz, M.; Alves, Marcus Vinícius Canhoto; Lafratta, Fernando H.; Nogueira, André Lourenço; Zdanski, P. S. B.

doi:10.1016/j.jnnfm.2023.105033

Cited by 5 publications

(4 citation statements)

References 25 publications

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“…The component analized in this work is a test specimen injected in acrylonitrile-butadiene-styrene (ABS 750 from Kumho Petrochemical) [28] . In addition to its widespread use in industry, the ABS 750 was used in this work owing to the experimental and numerical validation of its rheological equations performed by the authors in previous studies [24,29] . The volume of the test specimen is 3 8.297 cm , and the specific mass of ABS 750 is 3 1, 033.40 g cm − according to the material manufacturer [28] , which leads to an average injected mass of 8.574 g. The ABS 750 was processed with an injection temperature of 235°C, a mold wall temperature of 10°C and an injection pressure of 25 MPa.…”

Section: Methodsmentioning

confidence: 99%

“…Under the same simulation conditions, experimental injection tests were performed to measure the flow front lines. The experimental strategy adopted to obtain the flow front was described in details in the work of Miranda et al [24] . Noticeably, the inertia of the injection screw was not accounted for explicitly; however, its effects are included in the measurements of the flow front at the injected part.…”

Section: Experimental Inlet Velocitymentioning

confidence: 99%

“…In most simulations of thermoplastic injection processes, the design engineer ignores the geometry of the injection channels and gate, as this only results in more computational time, in addition to running more risks of divergences in the simulations [23] . This procedure ties the accuracy of the results with the knowledge and experience of those who set up the simulations [24] . However, there are studies that prove that, in molten polymer injection processes, depending on the gate inlet velocity, the product may suffer injection failures [25,26] .…”

Section: Introductionmentioning

confidence: 99%

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A methodology for determination the inlet velocity in injection molding simulations

Miranda,

Rauber,

Vaz Jr.

et al. 2024

Polímeros

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The inlet velocity of thermoplastic in injection molds plays a crucial role in obtaining high-quality polymer parts and the final performance of the product. It is known that the way the polymer is injected into the mold can directly affect important properties, such as the distribution of internal stresses, the cooling rate and the formation of surface defects. However, there are injection molding machines that only control injection pressure and dosage, making it difficult to obtain the gate inlet velocity into the mold cavity. Besides, some molds have many injection channels as well as complex inlet geometries, which make a challenging task to identify the inlet velocity. This study presents numerical and experimental approaches on how to determine the entry velocity in thermoplastic injection molds. The main results showed that these methods are highly efficient and contribute to identifying the gate inlet velocity with good accuracy.

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Section: Methodsmentioning

confidence: 99%

Section: Experimental Inlet Velocitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A methodology for determination the inlet velocity in injection molding simulations

Miranda,

Rauber,

Vaz Jr.

et al. 2024

Polímeros

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“…Layered polymer injection process is an important means of tertiary oil recovery, which can increase the coverage of polymer flooding, alleviate interlayer conflicts, and improve crude oil recovery rate [1]. The layered polymer injection process in Dagang Oilfield has gone through three stages of development: initiation, development, and integration.…”

Section: Introductionmentioning

confidence: 99%

Structural Optimization Design of Throttle Valve Core for Intelligent Layered Polymer Injection String Controlled By Cable

Wang,

Chen,

Qiao

et al. 2023

J. Phys.: Conf. Ser.

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Optimization Design of Throttling Valve Core Structure for Wired Intelligent Layered Polymer Injection String Abstract: Wired intelligent layered polymer in-jection technology can improve the coverage of polymer flooding, alleviate inter-layer conflicts in reservoir development, and improve crude oil recovery. It is an important component of tertiary oil recovery. However, the layered polymer in-jection technology currently used in most domestic oilfields is still the method of fishing and changing the injection nozzle for testing and adjustment. The alloca-tion efficiency of injection volume testing for each layer is slow, with large er-rors, and it is impossible to monitor polymer injection parameters throughout the process. To this end, research has been carried out on the cable controlled intelli-gent layered polymer injection string. By optimizing a highly efficient and low viscosity loss streamlined layered polymer injection throttling device with contin-uously adjustable gaps, the adjustment stroke is shorter and the measurement and adjustment efficiency is higher. Using finite element simulation, the low shear throttle control unit was studied and optimized. By moving the polymer core up and down slightly in the axial direction, the relative gap between the polymer core and the working cylinder was changed to achieve flow adjustment. At the same time, it is necessary to complete the direct reading measurement and adjustment process to form a single pipe layered polymer injection measurement and adjust-ment integration technology. The cable controlled intelligent layered polymer in-jection matching technology connects with the ground intelligent control system through cables to achieve realtime monitoring and online control of polymer flow, pressure, temperature, and other parameters, improving monitoring accura-cy and efficiency, and providing technical support for the construction of the “Digital Intelligence Oilfield”.

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2D and 3D SPH simulations of transient non-isothermal viscoelastic injection molding process with complex-shaped cavities

Xu,

Tian,

Sun

et al. 2025

Journal of Non-Newtonian Fluid Mechanics

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Analysis of numerical modeling strategies to improve the accuracy of polymer injection molding simulations

Cited by 5 publications

References 25 publications

A methodology for determination the inlet velocity in injection molding simulations

A methodology for determination the inlet velocity in injection molding simulations

Structural Optimization Design of Throttle Valve Core for Intelligent Layered Polymer Injection String Controlled By Cable

2D and 3D SPH simulations of transient non-isothermal viscoelastic injection molding process with complex-shaped cavities

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