Regional temperature control in ceramic injection moulding: An approach based on cooling rate optimisation

Bianchi, Maria Floriana; Gameros, Andres; Axinte, Dragoş; Lowth, Stewart; Cendrowicz, A.; Welch, Stewart T.

doi:10.1016/j.jmapro.2021.06.069

Cited by 11 publications

(4 citation statements)

References 29 publications

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“…The incorrect preset of the polymer velocity can produce defects, such as shrinkage and flow marks when using high velocities, whilst low velocities can lead to incomplete mold filling [2] . Furthermore, the gate inlet velocity also affects the cooling time (cooling rate) and polymer crystallization, influencing the molecular structure and final properties of products [3] . Such issues highlight the importance of understanding the gate inlet velocity, once this parameter is essential in injection mold design [4] , primarily to maintain efficient control of injection molding processes [5] and achieve high-quality polymer parts and high performance [6] .…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

A methodology for determination the inlet velocity in injection molding simulations

Miranda,

Rauber,

Vaz Jr.

et al. 2024

Polímeros

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“…The distribution of part thickness can affect the cooling time; thicker sections may require more cooling, typically through a single cooling rate in the coolant channel. Therefore, a local mold-temperature control design for part thickness is necessary to minimize the variation in shrinkage and the cooling time [17]. Furthermore, conformal cooling systems are often used to e ciently reduce warpage and cooling time [18].…”

Section: Introductionmentioning

confidence: 99%

Measurement of pressure–volume–temperature diagrams based on simulated melt temperature and actual cavity pressure

Zhu¹,

Shen

Huang³

2023

Int J Adv Manuf Technol

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Pressure-volume-temperature (pvT) diagrams illustrate the behavior of a polymer melt during injection molding and can be used to determine the optimal process parameter settings for producing quality parts. However, the measurements of pvT diagrams are costly and time-consuming and have limitations for process control. This study generated an economic pvT diagram based on sensor data and simulation analysis. To avoid the use of expensive infrared sensors and inaccurate pressure simulations, a pvT curve was constructed by combining the melting temperature, which was simulated using computer-aided engineering, and the actual cavity pressure. The speci c volume of the polymer melt was then calculated using a modi ed Tait model. The pvT diagram could be used to investigate the changes in speci c volume at various injection stages, which could be applied to quality prediction. In this study, a at plate with uneven thickness was used as the research vehicle. The speci c volume of each sensor position of the plastic component cooled to room temperature was calculated. Thereafter, a correlation analysis between the changes in speci c volume and the shrinkage ratio of the plastic part was conducted. The experiment indicated that both variables were highly correlated. Therefore, monitoring changes in speci c volume could predict part size. Additionally, the proposed measurements of the pvT diagram could be used to compute the cooling time, which greatly affects the quality and production e ciency of injection-molded parts. A 25-s cooling time setting demonstrated a stable molding quality compared with the traditional heat transfer formula (16 s) and the commercial simulation (17 s).

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“…However, the time required for the plastic to achieve ejection temperature from the melting temperature was inevitably increased as the mold temperature and the forming cycle time increased. Bianchi et al [ 28 ] compared a novel approach based on cooling rate optimization with RHCM techniques in ceramic injection molding. Results showed that the new method emerged with the benefits of higher dimensional control and reduction of differential shrinkage compared to the other analyzed approaches.…”

Section: Introductionmentioning

confidence: 99%

Investigations on Temperatures of the Flat Insert Mold Cavity Using VCRHCS with CFD Simulation

Wang

Chen

2022

Polymers

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This paper adopted transient CFD (Computational Fluid Dynamics) simulation analysis with an experimental method for designing and surveying the quick and uniform rise in the temperature of the plastics into the insert mold cavity. Plastic injection molding utilizing VCRHCS (Vapor Chamber for Rapid Heating and Cooling System) favorably decreased the defects of crystalline plastic goods’ welding lines, enhancing the tensile intensity and lowering the weakness of welding lines of a plastic matter. The vapor chamber (VC) possessed a rapid uniform temperature identity, which was embedded between the heating unit and the mold cavity. The results show that the tensile strength of the plastic specimen increased above 8%, and the depths of the welding line (V-gap) decreased by 24 times (from 12 μm to 0.5 μm). The VCRHCS plastic injection molding procedure can constructively diminish the development time for novel related products, as described in this paper.

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Regional temperature control in ceramic injection moulding: An approach based on cooling rate optimisation

Cited by 11 publications

References 29 publications

A methodology for determination the inlet velocity in injection molding simulations

A methodology for determination the inlet velocity in injection molding simulations

Measurement of pressure–volume–temperature diagrams based on simulated melt temperature and actual cavity pressure

Investigations on Temperatures of the Flat Insert Mold Cavity Using VCRHCS with CFD Simulation

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