工艺与制造英文2020被引 14
通过集成仿真方法改进热塑性材料翿曲预测
Improvement of warpage prediction through integrative simulation approach for thermoplastic material
Mahesh Divekar, Vivek R Gaval, Andreas Wonisch · Department of General engineering, ICT Mumbai, Mumbai, Maharashtra, India
摘要整理
注射成型零件的翿曲预测在初期阶段的准确性至关重要,可避免模具反复修改的迭代工作。许多组织的仿真团队采用现有商业软件进行工艺仿真,但这些仿真技术中的材料模型存在一定局限性和假设条件,导致翿曲预测结果与实际物理测量值的偏差可达50%。常用的Moldflow仿真模型忽略了温度相关的力学性能和粘弹性材料的应力松弛谱,这些假设显著影响翿曲预测精度。为降低此类偏差,BASF扩展了基于集成仿真技术的Ultrasim®工具,新增了具有温度相关非线性力学性能和应力松弛行为的热机械材料模型。该模型用于完整描述翿曲的瞬态过程,包括模腔内的保压阶段、冷却阶段和脱模阶段。本研究以未增强的半结晶聚对苯二甲酸丁二醇酯(Ultradur® B4520)为研究对象进行翿曲关联性研究。比较了集成仿真方法、现有翿曲仿真方法与实际实验检测结果的预测精度。结果表明,基于集成仿真(Ultrasim)的翿曲仿真方法的精度相对更高,与实际测量值更加接近。
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