Modelling and Simulation for Micro Injection Molding Process

Xie, Liping; Shen, Longjiang; Jiang, Bingyan

doi:10.5772/16283

Cited by 13 publications

(6 citation statements)

References 21 publications

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“…These conclusions were confirmed by Liu, Song, Wang, and Zhang [103] that focused their researches on the replication quality of micro-channels molded by mIM: final results have shown that shrinkage phenomenon was the main reason for lack of replication quality. Moreover, as proposed by Xie, Shen, and Jiang [104], the replication quality was mathematically defined with similar formula adopted for shrinkage measurement, but with opposite interpretation because a high replication quality is advisable.…”

Section: Processing Parameter Influencesmentioning

confidence: 99%

Review of Factors that Affect Shrinkage of Molded Part in Injection Molding

Annicchiarico¹,

Alcock²

2014

Materials and Manufacturing Processes

123

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Purpose: This paper reviews the factors affecting shrinkage of molded parts in injection molding. Methods: A selective screening of the papers published in the last 10 years was adopted. The review was organized according to molding scale (macro or micro) and by considering four branches of influence: material behaviors, processing parameters, mold, and specimen design. Results: Within the interval of confidence, at the macroscale, critical processing parameters were the temperatures, the packing parameters, cooling time, and injection speed; temperatures and packing parameters resulted critical factors at the microscale as well. Concerning the design aspects, the runner size and the ribs affect shrinkage at the macro and microscale, respectively. The analysis of the literature review has shown an absence of statistical approach for determining the material influences, a lack of information on shrinkage occur in powder-molded parts and the absence of data in specimen with dimensions below 10 m. Conclusions: The review collected the factors that affect shrinkage in injection molding, and identified three possible areas for further works.

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Section: Processing Parameter Influencesmentioning

confidence: 99%

Review of Factors that Affect Shrinkage of Molded Part in Injection Molding

Annicchiarico¹,

Alcock²

2014

Materials and Manufacturing Processes

123

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show abstract

“…In this study, the simulation software Autodesk Moldflow Insight 2018 was used. A study by Xie et al concluded that a 2.5D meshes such as the Moldflow dual domain mesh do not capture all effects taking place [23]. Therefore, a full 3D meshwais used.…”

Section: Moldflow Simulationmentioning

confidence: 99%

High Temperature Adiabatic Heating in µ-IM Mould Cavities—A Case for Venting Design Solutions

Tucker¹,

Griffiths²,

Rees³

et al. 2020

Micromachines

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Micro-injection moulding (µ-IM) is a fabrication method that is used to produce miniature parts on a mass production scale. This work investigates how the process parameter settings result in adiabatic heating from gas trapped and rapidly compressed within the mould cavity. The heating of the resident air can result in the diesel effect within the cavity and this can degrade the polymer part in production and lead to damage of the mould. The study uses Autodesk Moldflow to simulate the process and identify accurate boundary conditions to be used in a gas law model to generate an informed prediction of temperatures within the moulding cavity. The results are then compared to physical experiments using the same processing parameters. Findings from the study show that without venting extreme temperature conditions can be present during the filling stage of the process and that venting solutions should be considered when using µ-IM.

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“…1,2 수지의 가소화는 스크류 회전에 의해서 수지 간, 수지와 배럴 내부 면 간, 수지와 스크류 면 간의 마찰과 밴 드히터로부터 전달되는 열로 인해 이루어진다. 3,4 사출성형 사 이클 중 냉각단계에서 가장 긴 시간을 차지하기 때문에 생산 성을 높이기 위한 냉각시간 단축에 관한 연구가 많이 수행되 었다. 5,6 금형 내에서 냉각이 완료되는 시점에 배럴의 수지는 완전히 용융을 마쳐야 하기 때문에 배럴 내의 스크류에서 가 소화 효율을 높이기 위한 연구가 필요하다.…”

Section: 서 론unclassified

Effect of Barrier Screw Design in Injection Molding Machines on the Plasticization Efficiency of Polypropylene Resin

Park¹,

Cho²,

Rhee³

et al. 2016

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The cooling phase takes the longest time in injection molding process. Subsequently, researchers are focusing on the reduction of cooling time in injection molding process. Appropriate screw design in injection molding machine is required to enhance plasticizing plastics in a short cooling time. In this study, the effects of two barrier screw designs, open and closed barrier flights, on the plasticization efficiency of polypropylene (PP) resin were investigated through melting experiments. Throughput, back pressure, torque, and melt temperature for RPM were measured after screw operation reached a steady state. And the melting behaviors of PP resin were examined by observing the distribution of materials in the screw channels after the screws were removed from the barrel. Plasticizing capability was measured and compared in terms of melting length, the distance between the starting and completion points of melting.

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Modelling and Simulation for Micro Injection Molding Process

Cited by 13 publications

References 21 publications

Review of Factors that Affect Shrinkage of Molded Part in Injection Molding

Review of Factors that Affect Shrinkage of Molded Part in Injection Molding

High Temperature Adiabatic Heating in µ-IM Mould Cavities—A Case for Venting Design Solutions

Effect of Barrier Screw Design in Injection Molding Machines on the Plasticization Efficiency of Polypropylene Resin

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