汽车中央骨架微孔发泡注塑成型模拟及工艺研究

发布时间：2018-01-06 10:01

本文关键词：汽车中央骨架微孔发泡注塑成型模拟及工艺研究　出处：《郑州大学》2017年硕士论文　论文类型：学位论文

【摘要】：在石油资源日趋紧张的今天,微孔发泡注塑成型技术在节约原材料和能源方面日益受到重视。微孔发泡注塑成型制品具有独特的表芯层结构、优异的尺寸稳定性,在汽车、生物医学和航天航空等领域取得了广泛应用。扩展微孔发泡注塑成型技术在汽车行业的应用,推动汽车轻量化设计,有着广阔的市场前景。本文利用Moldflow优化设计汽车中央骨架浇注系统,并模拟汽车中央骨架微孔发泡注塑成型过程。主要工作如下:(1)以汽车中央骨架为分析模型,划分模型网格;并根据制品的结构和浇注系统的设计原则,建立七浇口和九浇口两种浇注系统。以玻璃纤维增强聚丙烯(GF-PP)为成型材料,研究浇口数量对注塑成型压力、速度/压力切换压力、填充末端压力、翘曲变形的影响,确定了九浇口浇注系统方案。(2)在模具结构、原材料确定的情况下,运用正交试验,通过极差分析和方差分析,研究工艺参数对制品微孔半径和翘曲变形的影响程度;优化分析出最佳工艺组合:模具温度为40℃,熔体温度为260℃,注塑速率为330 cm3/s,减重比为2%。并验证了制品最佳成型工艺参数。(3)通过单因素试验,以最佳工艺参数为基础工艺参数,研究成型工艺参数对微孔发泡注塑成型制品和常规注塑成型制品的翘曲变形、体积收缩率、缩痕指数的影响;结果表明,微孔发泡注塑成型提高了制品尺寸稳定性(翘曲变形、体积收缩率),但增大了制品缩痕指数。
[Abstract]:In the oil resources become increasingly tense today, microcellular injection molding technology is paid more and more attention in the conservation of raw materials and energy. Microcellular Injection molding products with unique core structure, dimensional stability, excellent in automotive, biomedical and aerospace and other fields has been widely used. To expand the application of microcellular foam injection molding technology the automotive industry, promote the automotive lightweight design, has broad market prospects. The central skeleton optimization design of gating system using auto Moldflow, and Simulation of automobile central skeleton of microcellular foam injection molding process. The main work is as follows: (1) the car central skeleton for the analysis model, mesh the model; and according to the design principle and structure the gating system products, the establishment of the seven gate and the nine gate of two kinds of gating system. Using glass fiber reinforced polypropylene (GF-PP) as raw materials, research The number of gate pressure injection molding, speed / pressure switch pressure, filling end pressure, warping effects, to determine the nine gate runner system. (2) the structure of the mold, the raw material was determined, by orthogonal test, through variance analysis, study the technical parameters on the product and the influence of pore radius Warpage Optimization; analysis of the best combination of process: mold temperature is 40 DEG C, the melt temperature is 260 DEG C, the injection rate is 330 cm3/s and the weight ratio of 2%. and verify the products the best molding process parameters. (3) through the single factor experiment, the optimum process parameters based on process parameters, study on Warpage the molding process parameters of microcellular foam injection molding products and conventional injection molding, volume shrinkage, shrinkage index influence; the results show that the microcellular injection molding to improve the dimensional stability of products (warping Deformation, volume shrinkage, but increase the shrinkage index of products.

【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U466;TQ320.662

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