In contrast to solid parts fabricated through conventional injection molding (CIM), foamed parts manufactured via foam injection molding (FIM) exhibit substantial variations in mechanical properties, which are attributed to differences in the cellular structure. In this study, parts with different cellular structures are fabricated via FIM, during which the gas dissolution and desorption processes are controlled by subjecting the gas‐laden melt to reciprocating compression and expansion operations. The results suggest that the cell density can be drastically improved by rapidly decreasing the pressure caused by the mold opening and that the cell orientation obviously occurs in the direction perpendicular to the mold‐opening direction. Moreover, the cell density and cellular orientation can be adjusted by utilizing appropriate mold opening and closing operations, leading to improvements in the resultant ultimate mechanical properties. In particular, the foamed samples fabricated with controlled mold opening‐closing operations exhibit excellent tensile strength and strain‐at‐break, indicating that samples containing a high density of cells oriented along the tensile test direction facilitate the formation of superductility and an increase in tensile strength. Hence, a method that combines FIM with batch foaming has been proposed for improving the cellular structure and controlling the cellular orientation.

中文翻译：

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泡沫注射成型与间歇发泡相结合，可通过多种气体溶解和解吸过程提高孔密度并控制孔取向

与通过常规注射成型（CIM）制成的固体零件相比，通过泡沫注射成型（FIM）制成的泡沫零件在机械性能上表现出很大的变化，这归因于孔结构的差异。在这项研究中，通过FIM制造了具有不同泡孔结构的零件，在此期间，通过使含气熔体进行往复压缩和膨胀操作来控制气体的溶解和解吸过程。结果表明，可以通过迅速降低开模引起的压力来显着提高孔密度，并且孔取向明显发生在垂直于开模方向的方向上。此外，可以通过适当的模具开合操作来调节泡孔密度和泡孔取向，从而改善最终的最终机械性能。特别是，通过控制模具开合操作制造的泡沫样品表现出出色的拉伸强度和断裂应变，这表明沿拉伸试验方向取向的高密度泡孔样品有助于形成超延性并增加拉伸强度。强度。因此，已经提出了将FIM与间歇发泡相结合的方法以改善孔结构并控制孔取向。用受控的模具开合操作制造的泡沫样品表现出出色的抗张强度和断裂应变，这表明沿拉伸试验方向取向的高密度泡孔样品有助于形成超延展性并提高抗张强度。因此，已经提出了将FIM与间歇发泡相结合的方法以改善孔结构并控制孔取向。用受控的模具开合操作制造的泡沫样品表现出出色的抗张强度和断裂应变，这表明沿拉伸试验方向取向的高密度泡孔样品有助于形成超延展性并提高抗张强度。因此，已经提出了将FIM与间歇发泡相结合的方法以改善孔结构并控制孔取向。