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以气辅成型工艺对中空塑件成型的中空度、中空均匀度以及材料节省性等的影响为研究目标,以计算机辅助工程(CAE)软件作为主要分析工具,采用正交试验法,考查了成型工艺参数在不同水平下对中空体积比和气芯长度比指标的影响。结果表明,工艺参数重要性排序为延迟时间、预注体积比、溢槽体积比及气体压力;通过工艺优化,实际制件产品材料节省率达47 %,壁厚总体均匀。 相似文献
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运用MoldFlow软件对把手零件的气辅注塑成型过程进行CAE分析,结合气辅成型原理优化了浇口、进气口的位置,总结了气辅CAE的工作流程,分析了各工艺参数对产品壁厚、气道长度的影响,并调整参数,得到了满足设计要求的制品。 相似文献
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《塑料、橡胶和复合材料》2013,42(2-3):113-119
AbstractInvestigation of the characteristics of gas penetration in gas-assisted injection moulding (GAIM) of parts plays an important role in the successful application of gas-assisted injection moulding. Although these have been proposed by various investigators, quantitative rules based on well designed experiments on fibre-reinforced plastic materials have not been reported previously. Additions of glass-fibre bring about rather dramatic changes in material viscosity and heat conductivity, etc. In the present paper, spiral tube moulds with uniform diameters of 8 and 10 mm, respectively, and a plate mould of 3 mm thickness with gas channel design of semicircular crosssection were moulded using glass-fibre reinforced Nylon resin. The effects of fibre content, tube diameter, and processing parameters, including gas pressure, delay time, and injection stroke on gas penetration characteristics and mouldability for fibre-reinforced Nylon parts were investigated experimentally. It was found that the coating melt thickness decreases with increasing gas pressure, until the gas pressure reaches a critical value, when the coating melt thickness becomes relatively constant for the spiral tube. Meanwhile, using a longer delay time for gas injection will increase the skin melt thickness. The hollowed core ratio increases with increasing diameter of spiral tube. Alternatively, the hollowed core ratio of GAIM plate and spiral tube parts increases when the content of glass-fibre is increased. However, when the fibre content is over 10 wt-%, it shows less influence on the hollowed core ratio for plate parts. Furthermore, although the area of the moulding window decreases with increasing content of fibre, they all show good mouldability. From these results, one can provide an empirical formula to CAE simulation designers and part/mould designers for GAIM fibre-reinforced Nylon parts to achieve suitable mouldability and accurate CAE simulation. 相似文献
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采用计算机辅助工程(CAE)技术分析了丰田汽车标志牌的成型过程,并分析了其表面缩痕及翘曲变形等问题产生的原因。分别采用改变浇注系统位置和去料改变塑件厚度的方法来解决塑件的表面缩痕和翘曲变形等问题,结果表明,改变浇注系统位置无法解决这些问题;而通过去料将塑件中心厚度改为3.6 mm时,沉降指数最大值由原来的4.493 %降低到3.886 %,且沉降指数的变化更加平缓,改善了塑件表面的缩痕;翘曲变形量由原来的0.4816 mm降低到0.2414 mm。 相似文献
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A modified injection molding machine with a compression mechanism, and a mold with a movable wall and shut-off mechanism, were used to investigate the effects of processing parameters on the quality of injection-compression-molded polystyrene disks. The compression start-up time, compression force, melt temperature, and part thickness were selected processing parameters. The disk moldings were evaluated based on dimensional accuracy and birefringence. It is found that the compression start-up time affects packing time, and thus greatly affects the residual orientation. If the transition from packing to compression could start before peak cavity pressure, disks with low residual orientation could be obtained. High compression force improves part quality and reduces thickness. Since both compression-induced reduction and cooling-induced shrinkage are involved, the effects of temperature and thickness are not as straightforward as the trends in conventional injection molding. 相似文献
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基于综合平衡法的RHCM成型LCD电视机前面壳工艺优化研究 总被引:2,自引:0,他引:2
在综合利用正交实验法、CAE分析和数据处理技术的基础上,对快速冷热成型技术(RHCM)成型LCD电视机前面壳成型工艺进行了优化研究。通过实验设计及数值模拟获得样本数据,结合方差分析技术确定了该产品各成型品质指标的显著性影响因素;进而通过级差分析和综合平衡分析研究得出了该产品的最佳工艺因素组合,并经实验验证了该优化组合的工艺可行性。 相似文献
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针对塑件壁厚大收缩变形大的成型问题,首先借助计算机辅助工程(CAE)分析确定了塑件的成型方式采用气辅注射成型(GAIM)工艺,经优化后,采用单点侧浇口进行浇注,两点注气口进行注气辅助成型。经注塑参数优化、注气参数优化后,能将塑件的收缩变形能控制在0.3 %~0.42 %之间。基于CAE分析,设计了塑件的一模两腔两次打开气辅成型两板模具,模具中,设置了一种复合式两次抽芯哈弗滑块机构、一种通用型斜导柱哈弗滑块机构来进行侧抽芯脱模。复合式机构中,先通过动模垫板与动模板之间的第一次打开,先实现斜型芯的抽芯,而后再通过定模板与动模板之间的第二次打开,来驱动哈弗滑块体进行侧抽芯。CAE优化分析对气辅注射成型模具结构的设计具有非常重要的指导作用,有利于整体设计效率的提升。 相似文献
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为了提高高光无痕注塑成型(rapid heat cycle molding,RHCM)制品综合品质,提出了一种基于Kriging模型与遗传算法(genetic algorithm,GA)结合的工艺参数优化策略.将该策略应用于某空调柜机出风面板成型,以正交实验法规划实验,通过CAE分析获取实验样本数据,借助数据归一化法、线性加权法、直观分析法等数据处理方法,得到了对RHCM成型影响显著的工艺参数依次为保压时间、冷却时间、熔体温度、加热时间.然后引入Kriging建模理论,建立了RHCM成型制品综合品质与主要成型工艺参数的近似模型,采用GA对建立的近似模型在可行解空间搜寻最优解.得到的最优工艺参数为:加热时间36.9 s,熔体温度182.9℃,保压压力88.5 MPa,冷却时间51.3 s.最后,通过CAE分析和生产试制分别验证了该优化策略的可行性和合理性. 相似文献
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针对注塑产品容易产生翘曲和缩痕的问题,以某检测仪外壳为研究对象,运用RBF神经网络模型和遗传算法,对注塑成型质量进行控制与预测。基于正交试验方案,运用Moldflow有限元分析软件获得试验结果;利用样本数据建立试验因素与响应值之间的RBF神经网络模型,并用最优拉丁超立方抽样技术,获得样本点对模型精度进行检验;运用带精英策略的非支配排序遗传算法(NSGA-Ⅱ)对注塑成型工艺参数进行多目标优化,达到有效控制和预测翘曲变形、体积收缩率和缩痕指数的目的,并经模拟和试模验证误差较小。结果表明,运用RBF神经网络模型和遗传算法对注塑成型质量进行控制与预测,生产出检测仪外壳最大翘曲变形量为0.394 mm,外观无缩痕。 相似文献
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The effects of processing parameters, such as melt temperature, mold temperature and cooling time, on the bonding strength of the interface in a sequential two-staged injection molding process were investigated both theoretically and experimentally. A theoretical bonding strength model, which accounts for the cooling profile through the thickness of the part and the interpenetration depth of polymer chains across the interface, was proposed. Under various mold and melt temperatures, experiments of sequential two-staged injection molding processes for polystyrene (PS) were also conducted to verify the validity of the model. Finally, an interrelationship between the average extent of reaching an effective interpenetration depth and the degree of bonding has been constructed. The model proposed in this research would be useful in the CAE analysis for a two-staged injection molding process in which distortions or even fractures might occur at the interface. 相似文献
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顺序共注成型芯层熔体前沿突破的数值模拟研究 总被引:11,自引:2,他引:9
基于Hele-Shaw流动模型,运用CAE技术,模拟了聚合物流变性能及重要工艺参数对顺序共注成型芯层熔体前沿突破过程的影响,并用流变学理论揭示其影响机理。 相似文献
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Motion control parameters of rotational molding can affect process efficiency and product quality. Different motion control schemes will lead to varied powder flow regimes exhibiting different levels of mixing and temperature uniformity. The change in nature of powder flow during a molding cycle suggests that varying the rotational speed could improve the powder mixing and temperature uniformity, therefore potentially reducing processing time and energy consumption. Experiments completed investigating powder flow under uniaxial rotation show that savings of up to 2.5% of the heating cycle time can be achieved. This validates the hypothesis that altering the rotational speed to maintain the ideal powder flow throughout the heating cycle can be utilized to reduce the time taken for all the polymer powder to adhere to the mold wall. The effect of rotational speed on wall thickness uniformity and impact strength were investigated and discussed. Results show a strong influence of rotational speed (and powder flow) on the wall thickness uniformity of the moldings with wall thickness uniformity deviations of up to 50% found (within the 2–35 RPM speed range tested). 相似文献