Tucker Matthew, Griffiths Christian A, Rees Andrew, Llewelyn Gethin
College of Engineering, Swansea University, Swansea SA1 8EN, UK.
Micromachines (Basel). 2020 Mar 30;11(4):358. doi: 10.3390/mi11040358.
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.
微注塑成型（µ-IM）是一种用于大规模生产微型零件的制造方法。这项工作研究了工艺参数设置如何导致模具型腔中 trapped 并迅速压缩的气体产生绝热加热。驻留空气的加热会导致型腔内产生柴油效应，这会在生产过程中使聚合物零件降解并导致模具损坏。该研究使用 Autodesk Moldflow 模拟该过程，并确定用于气体定律模型的准确边界条件，以对成型腔内的温度进行明智的预测。然后将结果与使用相同加工参数的物理实验进行比较。该研究的结果表明，在该过程的填充阶段，如果不进行排气，可能会出现极端温度条件，并且在使用微注塑成型时应考虑排气解决方案。
