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针对玻璃纤维增强聚丙烯(PP)注塑制品存在的翘曲变形缺陷, 利用计算机辅助工程(CAE)以及正交实验设计相结合的方法,以汽车内饰件为例,研究了注射工艺参数如熔体温度、模具温度、纤维含量、注射时间、速度压力转换对制品成型翘曲的影响。结果表明,纤维含量、模具温度对翘曲变形影响作用较为明显,且存在最佳值;通过优化工艺参数,可使注塑制品翘曲变形最小,提高注塑制品的品质。 相似文献
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基于翘曲分析的注塑模工艺参数的优化 总被引:2,自引:0,他引:2
结合CAE及Taguchi DOE技术,研究工艺参数对注塑制品翘曲量的影响。采用了有交互作用的L16(215)正交表设计实验以及没有交互作用的L9(34)正交表设计实验,研究了因素如熔体温度、模具温度、保压压力、保压时间和注塑时间对翘曲影响的显著性。对所选参数,保压压力和熔体温度对注塑制品的翘曲量影响最大。通过两次正交设计实验,使手机上壳制品的翘曲量减少了34.23 %,提高了制品品质。 相似文献
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《塑料》2017,(3)
针对某汽车塑件注塑成型时成型末端翘曲量较大导致尺寸变差的问题,结合注塑成型CAE工艺分析后发现,引起产品充填末端翘曲变形大的主要原因为注塑后冷却收缩不均,针对此问题,将CAE仿真分析和RBF神经网络的预测分析相结合,对注塑工艺参数中的保压工艺和冷却工艺进行了优化设计,CAE分析方案采用(冷却+填充+保压+翘曲),RBF神经网络采用聚类法和梯度算法,应用改善翘曲的L_(27)(38)设计试验方案进行神经网络训练和检验,应用混合正交法(L_(36)(2*6 3*2))进行二次水平密化优选参数,通过优化,找到了改善翘曲的注塑工艺方案,优化的注塑工艺方案能较好的指导产品的批量生产,对其它同类注塑产品的生产有较好的实践参考意义。 相似文献
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利用华南理工大学自主研发的注水系统和水辅注塑弯管模具,研究了熔体温度、模具温度、注水延迟时间、熔体注射量、注水压力、注水温度、熔体注射速率和熔体注射压力等8个水辅成型主要工艺参数对聚丙烯制品壁厚偏差率的影响,并分析了影响机理。结果表明,部分工艺参数对于制品弯曲段的壁厚偏差率有影响;增加注水延迟时间,降低注水压力和模具温度,短射填充区的制品壁厚的偏差率有所减小;提高熔体温度,壁厚偏差率的波动幅度增大。 相似文献
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Wei-Seng Cheng Chun-Sheng Chen Shia-Chung Chen 《Polymer-Plastics Technology and Engineering》2013,52(2):216-220
Polycarbonate (PC) composites filled with conductive nickel-coated carbon fibers (NCFs) were injection-molded under different injection process conditions. They were then used to investigate the influence of the injection processing parameters of melt temperature, mold temperature, injection velocity and packing pressure on the electromagnetic interference (EMI) shielding effectiveness (SE). In order to study the effect of the molding variables using the minimum number of experiments, the Taguchi method was employed. The aim of the Taguchi method was to optimize the injection processing parameters for better EMI shielding of the conductive polycarbonate composites. It is found out that the packing pressure and mold temperature affect the EMI shielding efficiency most significantly. 相似文献
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注射成型中的熔体温度均匀性研究 总被引:7,自引:0,他引:7
注射成型中的熔体温度均匀性直接影响注射制品的最终质量,熔体温度均匀性的大小与螺杆设计,加工工艺条件关系密切,对不同工艺条件和螺杆几何参数时的轴向温差进行了测量,并讨论了轴向温差的形成机理及其与加工工艺条件和螺杆参数之间的关系。 相似文献
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The objective of this study was to experimentally investigate the effects of various processing parameters on the water‐assisted injection molding of thermoplastic materials. Experiments were carried out on a lab‐developed water‐assisted injection molding system, which included a water pump, a water injection pin, a water tank equipped with a temperature regulator, and a control circuit. Two types of water injection pins designs were proposed to mold the parts. After molding, the lengths of water penetration in molded parts were measured. The effects of different processing parameters on the lengths of water penetration were determined. It was found that the shrinkage rate and the viscosity of the polymeric materials, and the void shapes of the hollowed cores mainly determined the water‐penetration lengths in molded products. In addition, a comparison has been made between the parts molded by water assisted injection molding and gas‐assisted injection molding. It was found that water‐assisted injection molded parts exhibit less uniform void sizes along the water channel. The cycle time for water‐assisted injection molded parts was shorter than that of conventional injection molded parts and gas‐assisted injection molded parts. 相似文献
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A model is proposed for the treatment of heat transfer with crystallization during plastics processing in general, and injection molding in particular. The model incorporates experimentally determined crystallization kinetics parameters. It permits the calculation of the distribution of both temperature and crystallinity in the molding. Theoretical predictions are in good agreement with experimental measurements in both injection molding and a prototype apparatus. 相似文献