A statistical analysis of nanocavities replication applied to injection moulding

Pina-Estany, J.; Colominas, Carles; Fraxedas, Jordi; Llobet, Jordi; Pérez‐Murano, F.; Forcada, Josep Maria Puigoriol; Ruso, D.; García-Granada, A. A.

doi:10.1016/j.icheatmasstransfer.2016.11.003

Cited by 16 publications

(12 citation statements)

References 20 publications

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“…The combination of these two models usually provides a faster solution with respect to the entire detailed model to achieve accurate results within the RoI. This strategy has been widely used to solve problems in different engineering fields including structural mechanics, electromagnetics, and thermofluid dynamics …”

Section: Introductionmentioning

confidence: 99%

“…This strategy has been widely used to solve problems in different engineering fields including structural mechanics, 6,7 electromagnetics, 8,9 and thermofluid dynamics. 10,11 In this paper, the application of the submodeling approach to FE wear predictions is investigated. Wear is present in a wide range of mechanical systems, from gears [12][13][14] to artificial implants, [15][16][17][18] and may affect their operating conditions.…”

Section: Introductionmentioning

confidence: 99%

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Application of the finite element submodeling technique in a single point contact and wear problem

Curreli

Puccio

Mattei

2018

Numerical Meth Engineering

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Summary Finite element simulation is a powerful tool to study and predict the wear behavior of different mechanical systems. However, the high computational cost required to obtain accurate numerical solutions is a crucial aspect especially for large and complex models. The present study proposes a possible solution to overcome this limitation by exploiting the potentiality of the submodeling technique, whose application to wear problem is still rare in the literature. A global‐local approach for wear analysis is presented and validated for a simple pin‐on‐disk wear test. In a preliminary step, different submodeling techniques were implemented and compared. They differed for the quantity (nodal forces and/or displacements) transferred from the global model to the local one. Numerical models have been developed in Ansys® mechanical APDL using its new wear simulation and mesh smoothing routines. Results suggest that the proposed strategy can significantly reduce the computational cost of finite element wear models. Some interesting points on the use of submodeling in contact problems are also discussed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Application of the finite element submodeling technique in a single point contact and wear problem

Curreli

Puccio

Mattei

2018

Numerical Meth Engineering

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“…The importance of those factors has been assessed for different applications, including microfluidic systems [ 3 , 4 ], micro channel moulding optimization [ 5 , 6 , 7 ], replication of micro ribs and micro features [ 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 ] and the effects of the processing parameters on micro cantilever using micro fingers dimensions as output response [ 1 , 2 , 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Process Parameters on Flow Length and Flash Formation in Injection Moulding of High Aspect Ratio Polymeric Micro Features

et al. 2018

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This paper reports an investigation of the effects of process parameters on the quality characteristics of polymeric parts produced by micro injection moulding (μIM) with two different materials. Four injection moulding process parameters (injection velocity, holding pressure, melt temperature and mould temperature) were investigated using Polypropylene (PP) and Acrylonitrile Butadiene Styrene (ABS). Three key characteristics of the mouldings were evaluated with respect to process settings and the material employed: part mass, flow length and flash formation. The experimentation employs a test part with four micro fingers with different aspect ratios (from 21 up to 150) and was carried out according to the Design of Experiments (DOE) statistical technique. The results show that holding pressure and injection velocity are the most influential parameters on part mass with a direct effect for both materials. Both parameters have a similar effect on flow length for both PP and ABS at all aspect ratios and have higher effects as the feature thickness decreased below 300 μm. The study shows that for the investigated materials the injection speed and packing pressure were the most influential parameters for increasing the amount of flash formation, with relative effects consistent for both materials. Higher melt and mould temperatures settings were less influential parameters for increasing the flash amount when moulding with both materials. Of the two investigated materials, PP was the one exhibiting more flash formation as compared with ABS, when corresponding injection moulding parameters settings for both materials were considered.

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“…Nevertheless, the decrease of the polymer viscosity due to a higher temperature along the cross section might compete with this phenomenon. Such behavior may lead to the arising of residual stresses in the polymer flow due to high shear rate values associated with the reduction of the molten polymer viscosity, as in the case of too high injection temperatures 29,30 . Another factor that should be considered in this analysis is the constant and slow cooling of the melt polymer.…”

Section: First Set Of Experimental Runs: Mold With No Venting Systemmentioning

confidence: 99%

Simulation of an Injection Process Using a CAE Tool: Assessment of Operational Conditions and Mold Design on the Process Efficiency

Miranda

Nogueira

2019

Mat. Res.

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The present work developed an experimental and simulation study to evaluate the influence of some operational conditions and mold design on the efficiency of an injection process used to produce polystyrene parts. The software SolidWorks Plastic was used to simulate the injection process and assess the performance of the mold considering the absence and the presence of venting. Experimental results obtained by varying the injection pressure, injection temperature as well as the mold temperature were used to validate the simulation data generated considering both mold designs. The findings revealed air entrapment at the end of the mold cavity and low process efficiency when the mold was operated with no venting, regardless the processing conditions. Simulation results indicated a remarkable increase of the process efficiency when vents were included on the parting line of the mold. In addition, the range of processing conditions which led to the highest process efficiency was virtually identified and tested in the real modified mold (with venting system). The findings revealed that the injection cycle time reduced in approximately 35% and the waste generation diminished from 65% to less than 1% when venting was included in the mold design and the optimal operational conditions were used.

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A statistical analysis of nanocavities replication applied to injection moulding

Cited by 16 publications

References 20 publications

Application of the finite element submodeling technique in a single point contact and wear problem

Application of the finite element submodeling technique in a single point contact and wear problem

Effect of Process Parameters on Flow Length and Flash Formation in Injection Moulding of High Aspect Ratio Polymeric Micro Features

Simulation of an Injection Process Using a CAE Tool: Assessment of Operational Conditions and Mold Design on the Process Efficiency

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