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工艺条件对气体辅助注射成型的影响 总被引:1,自引:0,他引:1
基于Hele-Shaw模型,采用CAE技术,利用Moldflow软件对气体辅助注射成型过程中熔体注射温度、熔体预填充量、气体注射压力、延迟时间等重要工艺参数与气体穿透深度、熔体厚度和体积填充时间等重要指标的关系进行了数值模拟.结果表明,熔体注射温度和气体注射压力越高、延迟时间越短,则气体穿透深度越小、熔体厚度越薄、体积填充时间越短;熔体预注射量越大,则气体穿透深度越小、熔体厚度越厚、体积填充时间越短. 相似文献
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基于气体辅助注塑成型过程的三维数值模拟,利用Taguchi实验方法设计了L9(34)实验矩阵,采用标准方差分析方法,分析了预注射量、注射温度、气体压力和延迟时间等工艺因素对气体穿透深度的影响,预测了优化工艺组合下的气体穿透深度。研究表明:在所选择的工艺因素中,对气体穿透深度影响程度依次为预注射量(F=87.8%)、气体延迟时间(F=8.1%)、气体压力(F=3.5%)和注射温度(F=0.6%)(F为因子重要性)。在优化工艺组合下预测的气体相对穿透深度为87.1%,与模拟计算值符合较好。 相似文献
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基于正交实验法的气体辅助注射成型工艺参数优化 总被引:1,自引:0,他引:1
以CD机体盖为例,以Moldflow作为主要分析研究工具,考察了气体辅助注射成型时制件的气体穿透长度和气指效应情况.以熔体的预注射量、气体延迟时间、熔体注射温度、注气压力等为关键工艺因素,采用正交实验法,利用Moldflow对正交实验方案进行模拟试验,得到不同工艺因素对气体穿透长度、气指效应的影响情况,并确定了最佳工艺参数组合. 相似文献
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气体辅助注射成型工艺凭借其特有的技术优势,近年来得到了广泛的研究及实际工程应用.并正成为塑料成型加工业中的新贵。本文探讨了气体辅助注射成型工艺流程。分析了气道中空效果对气辅件品质的影响。由于气道中空效果是气体穿透效果的直接反映。因此在文中较全面地论述了成型工艺对气体穿透效果的影响。通过运用有限元数值分析手段,预测气辅成型气体穿透效果。寻求最佳塑件中空效果的工艺参数。 相似文献
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以一个管状与平板相结合的气体辅助注射成型制品作为研究对象,引入了正交实验法和CAE技术,首先筛选出了影响制品质量的关键因素,再通过实际的气体辅助注塑成型实验,着重讨论了气体注射延迟时间和气体注射压力两个工艺参数对制品质量的影响,通过调节气体注射延迟时间和气体注射压力两个工艺参数的设置,参考气体穿透的变化情况,均能获得较好气体穿透效果的工艺参数组合. 相似文献
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电熨斗后盖注射成型CAE分析 总被引:1,自引:1,他引:0
应用美国AC—-TECH公司的C-MOLD软件对电熨斗后盖注塑充模过程进行了优化分析,通过对流动模拟、冷却模拟、翘曲变形模拟三者结果的综合分析,不仅获得最优化的工艺参数值,而且可进一步改善和提高该注塑件的质量。 相似文献
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A comparison has been made between the pressure drops arising during injection molding as predicted by a simulation software package named SIMPOL® and as measured during molding trials conducted to study the effects of molding variables. The theory used to design the software has been reviewed and the operation described. The comparison was made using amorphous thermoplastic polyesters, PET and PCTG. The molding conditions used for the simulated trials were the same as those used in practical molding trials. The molding trials were conducted using a mold fitted with a cavity transducer and a machine fitted with a hydraulic pressure sensor. The simulation shows qualitative agreement to the observations made in practice. The difference in pressure drop values are attributed to the software's dependence on crystalline PET physical properties for calculations and an overestimation of the frozen layer thickness by the simulation model. Overall the simulation has been shown to be a pragmatic tool for the production engineer working in the thermoplastic injection molding industry. 相似文献
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The rapid thermal response (RTR) injection molding is a novel process developed to raise the mold surface temperature rapidly to the polymer melt temperature prior to the injection stage and then cool rapidly. The resulting filling process is achieved inside a hot mold cavity by prohibiting formation of frozen layer so as to enable thin wall injection molding without filling difficulty. The present work covers flow simulation of thin wall injection molding using the RTR molding process. Both 2.5-D shell analysis and 3-D solid analysis were performed, and the simulation results were compared with the prior experimental results. Coupled analysis with transient heat transfer simulation was also studied to realize more reliable thin-wall-flow estimation for the RTR molding process. The proposed coupled simulation approach based on solid elements provides reliable flow estimation by accounting for the effects of the unique thermal boundary conditions of the RTR mold. 相似文献
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高温、高压的成型条件,使双层变模温制品的成型收缩对工艺参数的变化极为敏感,双层变模温制品的成型收缩控制策略成为提高制品质量的关键。以某空调遥控器前盖双层变模温成型工艺开发为例,探讨并制定了其成型收缩的控制策略。确定了考量成型收缩的多目标评价体系及参数变量,以拉丁超立方取样设计试验,并利用数值模拟软件进行充模、保压及冷却等过程模拟获取试验数据,建立了基于Kriging代理模型的变量与评价指标间的数学关系;利用遗传算法对数学关系进行迭代,寻找最优成型收缩的评价指标及变量组合;最后,将模拟及生产试验对研究策略的科学有效性进行验证。 相似文献
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Gas‐assisted injection molding can effectively produce parts free of sink marks in thick sections and free of warpage in long plates. This article concerns the numerical simulation of melt flow and gas penetration during the filling stage in gas‐assisted injection molding. By taking the influence of gas penetration on the melt flow as boundary conditions of the melt‐filling region, a hybrid finite‐element/finite‐difference method similar to conventional‐injection molding simulation was used in the gas‐assisted injection molding‐filling simulation. For gas penetration within the gas channel, an analytical formulation of the gas‐penetration thickness ratio was deduced based on the matching asymptotic expansion method. Finally, an experiment was employed to verify this proposed simulation scheme and gas‐penetration model, by comparing the results of the experiment with the simulation. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 2377–2384, 2003 相似文献
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