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介绍聚合物动态注射成型技术以及实现该技术的塑化注射装置。注射成型加工过程中使注射螺杆产生轴向脉动的激振力,可以利用电磁、机械、液压等方式来产生。电磁式振动塑化注射装置结构紧凑、振动频率高;模块化设计的液压激振装置结构简单,输出功率高,方便对传统塑料注射机进行改造。新技术具有加工能耗低制品质量高等特点,通过控制振动频率与振幅可以对制品的质量进行调控。 相似文献
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液压脉动注射成型聚乳酸力学性能及生物降解性能的研究 总被引:1,自引:1,他引:0
在不同振动工艺参数下,研究液压脉动注射成型对聚乳酸(PLA)制品力学性能、结晶性能及生物降解性能的影响.结果表明,与普通注射成型相比,液压脉动注射成型的PLA制品拉伸强度提高了10.6%,冲击强度提高了29.7%,结晶度提高了11.9%.在蛋白酶K催化降解下,其生物降解过程是从表面侵蚀到内部整体侵蚀的逐步演变过程,制品总降解速率比普通注射成型的小. 相似文献
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以车载蓝牙外壳为例,研究了局部密孔制件与普通制件高光注射成型的区别。利用Moldflow软件结合正交方法、数值模拟和数据处理技术,对高光无痕注射成型工艺进行了模拟分析。针对高光成型指标(翘曲变形、体积收缩率和熔接痕),研究了模具温度对高光制品品质的影响,得出高光制品品质随温度的升高而改善。并在此基础上模拟了熔体温度等多因素对高光制品体积收缩率和翘曲变形的影响,优化了工艺参数。 相似文献
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介绍了一项关于塑料制品的气体辅助注射成型新技术———振动气体辅助注射成型(VGAIM)。结合目前的塑料气体辅助注射成型及动态注射成型研究成果,详细叙述了振动气体辅助注射成型技术产生的背景及其基本原理,且具体介绍了振动气体辅助注射成型的工艺实现装置,并就其在改善制品结构性能和改进聚合物熔体填充机理中的应用进行了探讨。最后对其应用前景提出了展望。 相似文献
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微注射成型与微分注射成型技术 总被引:1,自引:0,他引:1
张攀攀;王建;谢鹏程;杨卫民 《中国塑料》2010,24(6):13-18
综述了国外微注射成型设备的发展历史,国内微注射成型设备的最新进展以及国内学者在微注射成型基础理论领域的研究进展,对现有微注射成型技术进行了系统地比较;提出了一种微型制品成型的新技术--微分注射成型技术,阐述了基于熔体泵的微分注射成型的成型机理,提出了一种利用常规注塑机进行微制品高效注射成型的实施方法。 相似文献
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BACKGROUND: A low‐frequency vibration‐assisted injection‐molding (VAIM) device was developed to explore the morphology of high‐density polyethylene (HDPE) injection moldings. Scanning electron microscopy, wide‐angle X‐ray diffraction and differential scanning calorimetry were used to characterize structure‐property relationships of final products prepared under different VAIM processing conditions (vibration frequency and vibration pressure amplitude) with conventional injection molding for comparison. RESULTS: It was found that increasing the vibration frequency at constant vibration pressure amplitude was beneficial for obtaining ‘shish‐kebab’ structures in the core region of VAIM specimens, and increasing the vibration pressure amplitude at constant vibration frequency was a prerequisite for achieving HDPE specimens with large‐scale lamellas, more pronounced orientation and high crystallinity. CONCLUSION: Both preferred orientation lamellas and increased crystallinity allow one to obtain strong injection moldings with the application of the melt vibration technique. Copyright © 2009 Society of Chemical Industry 相似文献
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注塑成型工艺已经发展成为塑料工业最重要的加工手段,注射模塑过程中需要选择和控制的压力包括塑化压力、注射压力和保压压力,它们直接影响塑料的塑化和塑件质量。通过对注塑过程中所涉及的工艺条件如何影响塑料制品的质量作了探讨,借助注塑工程分析软件对塑料制品的成型过程进行模拟,合理确定这些工艺参数,并分析了一个应用CAE技术优化工艺参数的实例,提出了比较切合实际并容易提高产品质量的注塑工艺方案。 相似文献
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Hans-Joachim Graf 《Polymer-Plastics Technology and Engineering》2013,52(3-4):209-221
The injection molding of elastomers has grown significantly in recent years and is constantly being employed for new and existing applications. In industrialized countries it is the preferred method for manufacturing high quality and high precision molded products. The constant escalation of injection molding machine use has been predicated by demands of the automotive industry for lower costs and higher quality. 相似文献
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CAE技术在电热水壶外壳注塑模设计中的应用 总被引:2,自引:0,他引:2
借助CAE技术设计了哈夫结构的电热水壶注塑模。通过最佳浇口位置分析并结合制件结构,确定了在制件顶端采用两点进胶方式;通过成型窗口分析确定了制件成型工艺参数组合为:模温45 ℃、料温235 ℃、注射时间1 s;通过充填分析查看了制品充填的品质及注射压力、锁模力的需求;通过冷却分析优化了冷却系统的布置。最后基于CAE分析结果进行了模具的总体结构设计。实践表明,CAE技术的应用能提高模具设计的合理性及效率,产品质量较高。 相似文献
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Wu Hong-wu Zhang Shao-dan Qu Jin-ping Xu Hai-hang 《Polymer-Plastics Technology and Engineering》2013,52(2):123-127
Using an online measure system consisted of a high sensitivity pressure sensor, a spiral channel mold and a data collecting/analysis series. The cavity pressure and flow length response under different injection pressure, injection velocity, mold temperature and different vibration condition was measured and analyzed in this study. The results show that the cavity pressure and flow length increased with the increase of injection pressure, injection velocity and mold temperature. In vibration assisted injection molding (VAIM), the cavity pressure and flow length increased as a result of imposing vibration. The change of amplitude and frequency in VAIM had more distinct effect on flow length than injection pressure. The results also indicate that the measure system established in this study can accurately monitor and record the changes of cavity pressure, and could be used in the study of melt's filling capacity in injection molding process. 相似文献
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CAE技术在汽车仪表板模具设计中的应用 总被引:4,自引:0,他引:4
阐述CAE技术在汽车仪表板模具优化设计中的应用,借助CAE模拟分析软件MPI对汽车仪表板的气体辅助注射成型进行了计算机模拟分析,优化设计了模具的浇注系统及气体辅助注射成型工艺,获得了高预测质量的产品。实践证明,CAE技术对于塑料模具的设计及塑料制品的成型具有较强的指导作用。 相似文献
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The present work is focused on the study of vibration‐assisted injection molding (VAIM) process, using polystyrene as a model polymeric system. This recently developed polymer processing operation is based on the concept of using motion of the injection screw to apply mechanical vibration to polymer melt during the injection and packing stages of injection molding process, to control the polymer behavior at a molecular level, which would result in improvements/alterations to the mechanical behavior of molded products. In this study, the afore‐mentioned concept was verified experimentally from monotonic tensile experiments and birefringence measurements of VAIM molded polystyrene in comparison with those of conventional injection molding process. The results of our study indicate that the actual degree of strength improvement depends on at least four parameters, namely, vibration frequency, vibration amplitude, vibration duration, and the delay time between the injection start and the vibration start. Furthermore, when these parameters were optimized, as much as a 28% strength improvement was observed, accompanied by an increase in toughness. Furthermore, birefringence measurements revealed that VAIM processing significantly altered the residual stress distribution throughout final products, but it did not, however, change the material density in the products. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci, 2006 相似文献
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对本课题组多年来进行的动态保压注射成型、剪切振动注射成型和压力振动注射成型研究进行了简要总结。振动注射成型不仅能改善聚合物熔体的高黏度、难流动、压力传递难等工艺问题,还能部分挖掘出聚合物材料的力学潜能,达到自增强,具有重要的理论意义和实用价值。 相似文献
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错误的研发理念导致精密注射设备研发的偏端.精密注塑设备的研发应树立在精密注塑价值链的高端的理念.以“潜在需求”的精密注塑制品的全套方案为宗旨,研发精密注塑设备,才能有所创新创造.精密注塑设备是与成型加工制品直接相关的功能化及专业化的设备,没有通用化的精密注塑机.精密注塑设备的性能和功能取决于精密注塑制品的全套方案.精密注塑设备的成型加工性能应使制品达到尺寸和形位公差精度、质量精度、表面粗糙度、内应力等质量要求以及寿命使用期的要求.精密注塑设备应体现出节能、清洁、环保等绿色化技术特征. 相似文献
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精密注塑设备的研发应树立在精密注塑价值链的高端的理念,以"潜在需求"的精密注塑制品的全套方案为宗旨,研发精密注塑设备,才能有所创新创造。精密注塑设备是与成型加工制品直接相关的功能化及专业化的设备,没有通用化的精密注塑机。精密注塑设备的性能和功能取决于精密注塑制品的全套方案。精密注塑设备的成型加工性能应使制品达到尺寸和形位公差精度、重量精度、表面粗糙度、内应力等质量要求,以及寿命使用期的要求。精密注塑设备应体现出节能、清洁、环保等绿色化技术特征。例举了全套方案研发"3C"电子产品全电动精密注塑机,实际成型加工的制品质量精度的标准偏差0.00051042g、变动系数0.00032929。 相似文献