Cheng Chun-Der, Liao Yi-Ling, Tsai Hsi-Hsun
Department of Mechanical Engineering, Ming Chi University of Technology, New Taipei City 24301, Taiwan.
Research Center for Intelligent Medical Devices, Ming Chi University of Technology, New Taipei City 24301, Taiwan.
Polymers (Basel). 2022 Apr 1;14(7):1437. doi: 10.3390/polym14071437.
Many challenges are associated with the injection compression molding process for producing a half-pallet (1320 mm × 1110 mm × 75 mm, length × width × height), which is butt-welded to another one for enhancing its strength. This pooled high-density polyethylene (HDPE) pallet is able to endure the impacts of a heavy load and a low ambient temperature. Reducing the warpage of a half-pallet is, therefore, essential for reducing the residual internal stress within the welded portions. An advanced Moldex3D package helps to detail the temperature distribution and warpage of a half-pallet. The pre-setting molding parameters from a mass-production factory produce half-pallets with worse flatness. In this investigation on using appropriate cooling water temperatures within the core and cavity plates of the mold, the numerical results show that the warpage of the top surface of the half-pallet was 11.549 mm, low warpage with respect to this large-scale pallet. Furthermore, the compression speed of 50-60 mm/s may have produced a low flatness of the half-pallet in this study.
制造一个半托盘（长×宽×高为1320毫米×1110毫米×75毫米）的注塑压缩成型工艺存在许多挑战，该半托盘需与另一个半托盘对接焊接以增强其强度。这种由高密度聚乙烯（HDPE）制成的组合托盘能够承受重载和低温环境的冲击。因此，减少半托盘的翘曲对于降低焊接部位的残余内应力至关重要。先进的Moldex3D软件包有助于详细分析半托盘的温度分布和翘曲情况。大规模生产工厂预设的成型参数生产出的半托盘平整度较差。在本次关于在模具的型芯和型腔板内使用合适冷却水温度的研究中，数值结果表明，半托盘顶面的翘曲为11.549毫米，相对于这种大型托盘而言翘曲程度较低。此外，在本研究中，50 - 60毫米/秒的压缩速度可能导致半托盘的平整度较低。
