| 摘要: |
| 为了探究消失模EPS模型的表面粗糙度影响因素、应力应变特征以及消失模EPS模型材料的热解规律和内部胞腔结构形态,达到降低消失模铸件的表面粗糙度,科学制定消失模工艺过程的控制参数,选择适合消失模工艺的合金材料,控制铸件内碳化物残留量,提高消失模铸件的表面质量和力学性能。本文采用激光粒度分析仪对用于消失模EPS产品模型成形的原始珠粒和预发珠粒的球形度、宽长比、凸度、颗粒度频度分布、颗粒度累积分布进行了测试分析,借助白光干涉分析仪对EPS原始珠粒、预发珠粒和EPS泡沫产品模型的表面粗糙度进行观察,运用热重差热仪分析了EPS原始珠粒和预发珠粒的热解特性,测试了EPS模型的准静态三维应变空序曲线和径向形貌的特征,并探讨了优化消失模成形工艺的可行性。研究表明:相较于消失模EPS原始珠粒,预发珠粒具有球形度高、粒径频度分散、表面粗糙度值高、化学失重温度区间狭窄的特点。常温常压下消失模EPS模型具有良好的塑性和适当的强度,其韧性断口呈现密集的胞腔组织结构。 |
| 关键词: 消失模EPS 表征 热重 差热 力学性能 |
| DOI：10.11951/j.issn.1005-0299.20210033 |
| 分类号:TG249.9；TG221 |
| 文献标识码:A |
| 基金项目:杭州市先进设计与制造技术重点实验室资助项目(204000590502). |
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| Research on characteristics and properties of EPS pattern materials for lost foam casting |
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WANG Xinjie
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(Key Laboratory for Hangzhou Advanced Design & Manufacturing Technology (City College, Zhejiang University), Hangzhou 310015, China)
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| Abstract: |
| To investigate the influence factors of surface roughness, stress-strain characteristics, pyrolysis regularity, and inner cellular structure morphology of Lost Foam Casting (LFC) EPS pattern, and to reduce surface roughness of LFC and scientifically formulate the control parameters for LFC process, cast alloy suitable for LFC process was selected, carbonation remains in castings were controlled, and surface quality and mechanical properties of LFC are improved. The sphericity, aspect ratio, convexity, particle size frequency distribution and particle size cumulative distribution of the raw bead and preformed bead used for LFC EPS product model forming were measured and analyzed by laser particle size analyzer. The surface roughness of EPS raw beads, EPS beads and EPS foam products was observed and analyzed successively by white light interference analyzer. The pyrolysis characteristics of EPS original bead and EPS bead were analyzed by TGA. The quasi-static three-dimensional strain space sequence curve and radial morphology of EPS model were tested, and the feasibility of optimizing LFC process was discussed. The results show that the preformed EPS beads have the characteristics of high sphericity, dispersion of particle size frequency, high surface roughness and narrow temperature range of chemical weight loss compared with the original EPS beads. At room temperature and atmospheric pressure, the EPS model for LFC has good plasticity and appropriate strength, and its ductile fracture presents dense cellular structure. |
| Key words: EPS of LFC characteristics thermo-gravimetric differential thermal mechanical properties |
