共查询到17条相似文献,搜索用时 73 毫秒
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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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阐述了近年来塑料注射成型的一些新技术,包括微型注射成型技术、振动气体辅助成型技术、节能降耗注射成型技术、水辅注射成型技术、簿壁超高速注射成型技术等,并对注塑成型技术的发展前景进行了展望。 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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流体辅助注射成型技术是一种塑料与流体的复合注射技术,它包括气体辅助注射成型和水辅助注射成型2种形式。分别介绍了气体辅助注射成型和水辅助注射成型的工艺过程、设备及特点。 相似文献
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通过微孔发泡注射成型和传统注射成型定量对比分析,系统分析了两种成型在翘曲变形、体积收缩、残余应力、温度场分布等方面的本质区别,并基于流变学理论,揭示了微孔发泡注射成型的成型机理。结果表明,微孔发泡注射成型的翘曲变形、残余应力、成型压力和成型时间明显小于传统注射成型的,且微孔发泡注射成型的翘曲变形和残余应力随着开始发泡的熔体预填充体积分数减小而减小,微孔发泡注射成型的熔体温度在浇口附近低于传统注射成型熔体温度,而在远离浇口处则要高。 相似文献
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塑料注射成型技术及其进展 总被引:6,自引:0,他引:6
简要介绍了气体辅助注射、多点进料注射、推拉注射、熔芯注射、层状注射、受控低压注射、注射-压缩、反应注射及结构发泡注射等注射成型新工艺的原理及特点。 相似文献
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世纪之争—全液压式与全电动式注塑机的比较 总被引:7,自引:0,他引:7
就全液压式与全电动式注塑机的锁模系统、注射系统和整机性能的优缺点进行了比较,阐述了作者自己的观点:全电动式注塑机将主要用于中小型注射成型机生产高档精密和小型精密零件,而不同类型的全液压式注塑机用于中高档、高档精密和特别高档制品的成型;大型注塑机应开发复合两板式注塑机。 相似文献
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概括地介绍了传统气体辅助注射技术的工艺及它的优缺点。并详细地介绍了气辅注射过程中的一些改进方法,如:外部气辅注射、局部气辅注射、振动气辅注射等,及运用其他介质的一些辅助成型方法,如:液体辅助注射(水辅注射)等新技术。 相似文献
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Breda Kegl 《Fuel》2008,87(7):1306-1317
This paper deals with numerical and experimental analysis of the influence of fuel temperature on the injection process. The tested injection system is the mechanically controlled diesel fuel injection M system of a bus diesel engine. The considered fuels are neat biodiesel from rapeseed oil and neat mineral diesel. All injection parameters, obtained with biodiesel, are compared to those of mineral diesel. At first, attention is focused on a single injection assembly (plunger-in-barrel assembly, high pressure tube, and injector). The flow through a single assembly to one cylinder is investigated numerically by using an one-dimensional mathematical model. The injection process is simulated at different operating regimes. On the basis of the numerical results, the influence of fuel temperatures on the injection characteristics, especially on fuelling at some stage of injection, mean injection rate, mean injection pressure, injection delay, and injection timing is investigated in view of harmful emissions reduction. Furthermore, the fuel flow through the whole injection system (all six injection assemblies) to all six cylinders is investigated experimentally with respect to fuel temperature. The pressure drop through the fuel filter and fuelling through each of six injection assemblies are analyzed. 相似文献
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This study was conducted to determine the macroscopic and fuel atomization characteristics of a piezo-driven injection system and to compare it with a solenoid-driven injection system in a common-rail diesel engine.In order to obtain the macroscopic characteristics of fuel spray, the spray development process was visualized using the spray visualization system composed of a Nd:YAG laser and an ICCD camera. The injection characteristics of the fuel spray such as injection rate and injection delay profile were investigated under the various injection conditions. The injection and atomization characteristics were investigated in terms of the droplet mean axial and radial velocities, droplet diameter, and droplet distributions obtained using a phase Doppler particle analyzer (PDPA) system.It was found that the piezo-driven injection system has a short injection delay and quickly reaches the maximum injection rate compared to the solenoid-driven injection system. Spray tip penetration makes little difference; however, the spray cone angle of the piezo-driven injector is larger than that of the solenoid-driven injector. The atomization performance of the piezo-driven injection system is superior to that of the solenoid-driven injection system due to a faster response time and higher injection rate. 相似文献