共查询到19条相似文献,搜索用时 125 毫秒
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微成型领域的关键技术 总被引:5,自引:1,他引:5
介绍了微成型技术产生的背景,探讨了微成型技术与常规注射成型技术的区别与联系,阐述了微型注塑机、微型模具制造等技术的特点,以及各成型工艺参数对塑件成型质量的影响和控制措施。 相似文献
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阐述了微注射成型技术的研究进展,比较了微注射成型技术与传统注射成型技术的不同要求,重点分析了微注射成型工艺及其装备的主要特点及研究现状,并基于熔体微分原理,提出了具有自主知识产权的微分注射成型技术及装备。发现采用微分注射成型创新技术,可以用1台微分注射成型装备达到多台微型注塑机的效果,最终实现微塑料制品高效率、低成本、大批量的生产。 相似文献
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本文从注塑机锁模结构的角度分析精密注塑成型的关键技术,并通过广东泓利机器有限公司研制的四缸直锁二板式注塑机在光盘注塑机的成功应用,提出精密、超精密注塑成型的一些重要技术指标,为以后精密、超精密注射成型技术概念的形成和标准的制定提供参考。 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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Panpan Zhang Pengcheng Xie Jian Wang Yumei Ding Weimin Yang 《Polymer Engineering and Science》2012,52(10):2237-2244
A novel concept of microinjection molding system was designed and presented. The system was designed as a multimicroinjection module, which is matched with a vertical injection molding machine (IMM) and can be applied on commercial IMMs. A planetary gear pump was integrated in this system to complete the multi microinjection molding (MμIM). The module is fixed between the stationary platen and the mold of IMM. The plasticizing unit of the IMM provides the melt and initial pressure for the multi microinjection molding system. With this system, a commercial IMM could be upgraded to a precise microinjection machine and has the capability of precise metering for the microinjection molding. Melt flowing behavior was predicted through the 3D injection molding simulation and experiments were carried out to testify the performance of the MμIM. The injection molding performance was evaluated and the results revealed that the MμIM system could effectively realize the microinjection molding. POLYM. ENG. SCI., 2012. © 2012 Society of Plastics Engineers 相似文献
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Lixia Wang Yang Zhang Lin Jiang Xuecheng Yang Yiping Zhou Xiaoyu Wang Qian Li Changyu Shen Lih-Sheng Turng 《应用聚合物科学杂志》2019,136(14):47329
Isotactic polypropylene micro parts were molded at different injection speeds by microinjection molding. The morphology and micro structure were characterized by a polarizing microscope, and the mechanical properties of differently structured layers were characterized by nanoindentation experiments. The influence of injection speed on the nanoindentation mechanical properties of each structural layer of the micro parts was analyzed. The results showed that the mechanical properties of different layers were different, the modulus and hardness of the position near the core layer were largest, and the modulus and hardness of the position near the skin were smallest. It is compelling that the modulus and hardness of each layer decreased first and then increased as the injection speed increased under a higher melt temperature (240 °C). Meanwhile, the opposite trend was observed at a lower melt temperature (220 °C). This phenomenon can be attributed to the competitive mechanism of the shear heat effect and the disorientation effect. In addition, injection speed had a greater influence on the nanoindentation mechanical properties in the perpendicular direction than in the flow direction. This work systematically explored the relationship between the microstructure and the local mechanical properties, which can provide new insights for microinjection molding design in the future. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47329. 相似文献
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This study applies a magnetic induction heating method for rapid and uniform heating of a mold surface for injection molding of 2‐inch light‐guided plates (LGPs). Mold temperature is an important process parameter that affects microinjection molding quality. This research investigates the effects of high‐mold surface temperature generated by induction heating in enhancing the replication rate of microfeatures of LGPs. This study has three stages. First, an appropriate power rate setting is determined for induction heating and injection molding process window. Second, all key parameters affecting microfeature quality are identified to determine the optimum LGP micromolding parameters using the Taguchi and ANOVA methods. Third, the quality of microfeature heights and angles are experimentally verified. Polymethyl methacrylate was molded under various injection molding conditions to replicate an electroformed nickel stamper with V‐grooves 10 μm in width and 5 μm in depth. In this investigation, injection speed was set in the conventional range. Experimental findings indicate that instead of high‐mold temperature, the combination of low mold temperature and high surface temperature obtained using induction heating improve replication quality and reduce cycle time. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010 相似文献
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电动注塑机与液压注塑机共创注塑机新发展 总被引:8,自引:0,他引:8
分析电动注塑机的发展现状及性能优势,比较电动注塑机与液压注塑机两者在结构、注射成型范围等方面的技术特点,指出液压注塑机应向多功能、多品种方向发展,并且应注重节能技术;电动注塑机应向高附加值的精密注塑机方向发展。 相似文献
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注射成型技术进展 总被引:9,自引:1,他引:8
邢文 《现代塑料加工应用》2002,14(4):33-37
介绍了注射成型工艺,注射成型机的一些新进展,重点介绍了气体辅助注射成型,微孔泡沫塑料注射成型,挤出和注射成型组合的直接成型技术及多组分注射成型的特点,同时介绍了电动注射成型机,无拉杆注射成型机和PET注射成型机。 相似文献
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The use of plastic materials in place of metals is attractive because of their versatility and ease of batch fabrication, which reduces costs. This article investigates the possibility of using nylon compounds in place of metal materials to make cost‐effective parts through microinjection molding. Experimental results showed that the plastic parts were well formed with high accuracy and reproducibility through microinjection molding. The average tolerance in the dimensions of the plastic parts was less than 20 μm. The resulting composites with 15 wt % carbon particles exhibited the optimum improvement in accuracy, reproducibility, and wear resistance. In addition, the wear loss of the metal parts without lubrication was 4–10 times higher than that of the polymer compounds. The results revealed that the ball‐screw plates made with nylon compounds exhibited high accuracy, reproducibility, and wear resistance, could be produced at low cost, and they could successfully replace S316 metal parts in microinjection molding. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 1645–1652, 2006 相似文献
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介绍了影响微注射成型过程中流变和充填性能的主要因素,重点综述了近年来国内外关于这些影响因素的相关研究情况及进展,同时对该领域今后发展趋势和研究热点进行了展望。 相似文献
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The morphology evolution and crystallization behavior of microinjection molded polyoxymethylene/molybdenum disulfide nanocomposite 下载免费PDF全文
Microinjection molding was carried out on polyoxymethylene (POM)/molybdenum disulfide (MoS2) nanocomposite prepared by solid state shear milling (S3M) technology. The morphology evolution and crystallization behavior were then investigated under different conditions of mold temperature and injection speed. The comparison between the microinjection molded micropart with conventional injection molded macropart was also conducted. Results showed that the higher mold temperature could improve the filling property and replication quality. The MoS2 particles played a heterogeneous nucleation role and remarkably affected the crystallization process of POM. Meanwhile, the crystallization orientation and skin‐core structure induced by the shear stress presented the similar evolution tendency under different microinjection conditions. The multi‐melting behaviors of microparts occurring under different microinjection conditions were attributed to the formation of shish‐kebab structures. The increase of crystallinity and the reduction of mechanical property occurring in macropart are related to its crystallization morphology formed, which is different from that of micropart. The results of this work would lay a foundation for preparation of POM/MoS2 transmission microparts with good comprehensive performance. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134, 44625. 相似文献