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主要研究注射成型过程中最常见的制件翘曲问题,尝试利用CAE模拟技术,以扫描器外壳为研究对象,对影响薄壳塑件翘曲变形的因素(如模具温度、熔体温度、注射时间、保压压力、保压时间、冷却时间)进行分析,并通过正交实验法找出最佳工艺参数组合。 相似文献
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《塑性工程学报》2017,(6)
对微齿轮注塑成型充填和保压过程进行了数值模拟,通过正交试验法和多目标规划法,讨论了模具温度、熔体温度、注射速度、保压压力和保压时间对微齿轮充填时间、收缩率和翘曲值的影响,利用单纯形法和MATLAB对多目标函数进行寻优,找到最佳工艺组合。结果表明,注射速度对充填时间的影响最大,模具温度对收缩率和翘曲值的贡献率最高。注射速度越大、模具温度越高,充填时间越短,但收缩率和翘曲值也越大。根据多目标规划法最优化计算,当模具温度、熔体温度、注射速度、保压压力和保压时间分别为100℃、240℃、1.4 mm3·s-1、84%、0.28 s时,充填时间最短,成型质量最高。热量损失和补缩率是影响充填时间和成型质量的主要原因。 相似文献
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介绍了基于UV-LIGA技术的导光板微结构注射成型工艺过程,对注射模型芯制作关键工艺进行了分析与研究,在优选关键制备环节工艺参数的基础上,制作了带有微结构的导光板镍型芯,并通过在精密注塑机上设置温度250℃、注射速度85 mm/s、保压压力80 MPa、保压时间7 s、模具温度80℃、冷却时间30 s的注射工艺参数,成功注射出了PMMA导光板微结构,微结构表面光滑,形貌理想。 相似文献
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基于Moldflow的汽车水箱盖注射成型工艺参数优化设计 总被引:1,自引:0,他引:1
利用Moldflow软件对汽车水箱盖成型过程进行数值分析,以降低塑件翘曲量为目标,利用正交试验法分析主要成型工艺参数对翘曲变形的影响规律,获得最佳工艺参数组合。研究结果表明:工艺参数对翘曲变形影响程度从大到小依次为保压压力、保压时间、熔体温度、冷却时间、模具温度、注射时间,参数优化后的塑件最大翘曲量为1.148 mm。 相似文献
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结合正交试验设计和数值模拟,选择模具温度、熔体温度、注射时间、保压压力和保压时间等5个主要工艺参数为设计变量,分别以最小体积收缩率和最小翘曲变形为目标,进行了线槽注射成型工艺参数的单目标优化设计。再利用加权综合评分法,对线槽注射成型工艺参数进行多目标优化设计,获得了兼顾体积收缩率和翘曲变形的工艺参数组合。 相似文献
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将MoldFlow技术与DOE(正交实验设计)相结合,以一款手机面板成型为研究实例,采用正交实验设计方法进行实验分析,研究了模具浇注系统(浇口直径、浇口长度、流道尺寸等)和注射工艺参数(注射压力、注射时间、冷却时间等)的关系,详细分析了浇注系统各属性对注射工艺参数的影响程度。研究结果表明,浇口长度对注射压力的影响最大,流道尺寸和冷却时间密切相关,而浇注系统与注射时间关系不大。 相似文献
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针应用MPI软件对薄壁筒状件水杯的注射过程中的冷却、流动、翘曲进行模拟。分析了填充时间、体积收缩率、翘曲变形等情况,通过优化保压压力、保压时间以改进翘曲变形量。其分析结果对模具优化设计具有良好的指导意义。 相似文献
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Warpage of injection-molded thermoplastics parts: Numerical simulation and experimental validation 总被引:3,自引:0,他引:3
Zhiying Guo Xueyu Ruan Yinghong Peng Dequn Li 《Journal of Materials Engineering and Performance》2002,11(2):138-144
A mathematical model and the integrated simulation program for predicting part warpage, which arises during injection molding
of thermoplastic polymers, were developed. To build the model, the finite element method (FEM) was used and the theory of
shells, represented as an assembly of flat elements formed by combining the constant strain triangular element and the discrete
Kirchhoff triangular element, was applied. This shell theory is well suited for thin injection molded products of complex
shape. Furthermore, in this work, experimental research on flat plates was performed to study the effect of the plastic material,
the mold structure, and certain key processing parameters on warpage. The investigated processing parameters include injection
pressure, packing pressure, injection time, packing time, cooling time, and melting temperature. Different examples were presented
to examine the developed simulation software, and results predicted from the simulation program were verified in the above
experiments and showed reasonable accuracy compared with experiment data. 相似文献
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对低压铸造铝合金车轮模具的水冷效果进行了测试,对比了风冷工艺与水冷工艺对铸件各部位材料性能和金相组织的影响。由水冷工艺的模具温度梯度变化,得到了提高铸件质量和生产效率的相关数据,为铝车轮低压铸造水冷却工艺的应用提供了基础技术积累。 相似文献
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T.V. Zhil’tsova M.S.A. Oliveira J.A.F. Ferreira 《Journal of Materials Processing Technology》2009,209(8):3894-3904
The effects of processing conditions on the characteristics of injection-molded high density polyethylene (HDPE) acetabular cups for the total hip replacement implants have been studied. The study has been focused on the effects of filling rate (injection speed), packing pressure, packing time and hot nozzle temperature of the mold on the dimensional stability, weight variation and visual appearance of the acetabular cups. A considerable influence of these processing conditions on the weight and dimension variation was found. Information regarding cycle time duration was obtained through numerical simulation of the entire molding process using a commercial dedicated code Moldflow Plastics Insight 6.1 (Moldflow Corporation, 2007). Within the influencing process parameters studied, the packing pressure was found to be the most significant one affecting the part dimensions and weight. An increase in the injection speed (decrease in the injection time) had a negative effect on the weight and on the most of the part’s analyzed dimensions. The influence of the hot nozzle temperature and packing time was considered irrelevant, for the range of process parameters under analysis. For all the set-point variation tests, two singularities on the linear dimension variations were identified: anisotropic shrinkage in flow and normal to flow direction and a slight plastic expansion at the location around the hall furthest away from the injection point. 相似文献