基于Moldex3D分析模具温度对PP发泡注塑制品的影响

Study on Effect of Mold Temperature on PP-Foamed Injection-Molded Products Based on Moldex3D Analysis

对微孔发泡注塑过程进行模具温度控制,对制品进行扫描电子显微镜、弯曲强度、冲击强度、表面粗糙度测试,探讨模具温度对制品的力学性能与泡孔结构的影响。结果表明,当其他工艺参数不变时,提高模具温度,制品的泡孔更加致密,有助于提高制品的弯曲性能和冲击性能并且有助于降低制品表面粗糙度;通过Moldex3D模拟统计泡孔平均直径、密度以及尺寸标准差,验证了模具温度升高时,泡孔尺寸标准差降低,泡孔分布更加均匀;通过模拟验证了当模具温度升高时,泡孔尺寸以及制品减重比变化趋势与实验结果一致。

The PP-foamed injection-molded products were processed by a microcellular foaming injection-molding method, and the effect of mold temperature on the mechanical properties and cell structure of the products were investigated by scanning electron microscopy, bending strength, impact strength and surface roughness. The results indicated that the cells of the products became denser with an increase of mold temperature, which led to an improvement in bending and impact performance but a decrease in surface roughness. The average diameter, density and dimensional standard deviation of the cells were simulated by a Moldex3D software, and the simulation results indicated that the standard deviation of cell size decreased with an increase of mold temperature, and the cell distribution also became more uniform. Moreover, the simulation also confirmed that that the trend in variation of mold temperature and weight loss ratio of cell was in a good agreement with the experimental results.