摘要
介绍了树脂板多点热成形装置和成形原理,进行了聚碳酸酯（PC）板鞍面件多点热成形实验,获得了形状轮廓较好、厚度分布均匀的实验件。测试了PC板的玻璃态转变温度和其在不同拉伸温度和速度条件下的真实应力-应变曲线,获得了广义Maxwell模型和PC-DSGZ模型的参数。建立了树脂板多点热成形有限元模型,开展了两种本构模型下PC板多点热成形数值模拟。结果表明两种本构模型鞍面件均实现贴模成形,PC-DSGZ模型可以获得更加均匀的应变和厚度分布。数值模拟与成形实验件的厚度对比结果显示PC-DSGZ模型模拟得到的鞍面件厚度与实验结果更接近。
The equipment and principle of multi-point thermoforming（MPTF） for resin sheet were introduced,the multi-point thermoforming experiment of PC sheet saddle part was carried out,and the experimental part with good outline and uniform thickness was obtained. The glass transition temperature and true stress-strain curves with different stretching temperatures and velocities of PC sheet were tested,then the material parameters of generalized Maxwell model and PC-DSGZ model were got. The finite element model of multi-point thermoforming for resin sheet was built,the numerical simulation of multi-point thermoforming for PC sheet with two kinds of constitutive model was carried out. The results show that the saddle parts simulated by both constitutive models fit the multi-point die completely,and more uniform distribution of strain and thickness can be got by PC-DSGZ model. The comparison result of thickness between numerical simulation and forming experiment shows that the thickness of saddle part simulated by PC-DSGZ model is closer to the experimental value.
作者
彭赫力
昝林
李明哲
李中权
PENG He-li;ZAN Lin;LI Ming-zhe;LI Zhong-quan(Shanghai Spaceflight Precision Machinery Institute,Shanghai 201600,China;Shanghai Engineering Technology Research Center of Near-Net Forming for Metallic Materials,Shanghai 201600,China;Shanghai Academy of Spaceflight Technology,Shanghai 201109,China;Dieless Forming Technology Center,Jilin University,Changchun 130025,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2018年第4期101-105,共5页
Journal of Plasticity Engineering
基金
国家自然科学基金资助项目(51505278)
关键词
鞍面件
多点热成形
树脂板
本构模型
saddle part
multi-point thermoforming
resin sheet
constitutive model
