共查询到18条相似文献,搜索用时 125 毫秒
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工艺参数对陶瓷注射成型的影响与分析 总被引:3,自引:0,他引:3
本研究通过改变注射温度,注射压力,保压压力等几个主要参数,对形状,体积不同的注射成型体,试条,圆柱及子部件进行了一系列注射工艺实验。相应地对成型体的密度,弯曲强度及烧结体的密度和强度进行测量,并从陶瓷注射成型混合物的流动行为,热物理特性方面对注射这一复杂过程进行分析,探讨工艺参数对成型过程的内在影响,从而确定合理的注射工艺条件。 相似文献
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介绍BMC注射成型技术的特点与原理,讨论了BMC注射成型设备的性能特点及工艺条件,并分析了常见的缺陷及其原因等。 相似文献
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金属粉末注射成型工艺 总被引:6,自引:0,他引:6
将现代塑料注射成型技术引入粉末冶金领域,不但扩大注射成型技术的应用,同时也推动粉末冶金工艺的发展。详细讨论金属粉末注射成型工艺及其应用,对其材料选择,产品与模具的设计、注射成型工艺过程及烧结工艺过程进行了系统的分析,并展望了该工艺中金属粉末、粘结剂、注射成型装备和工艺过程数值模拟软件等方面的发展趋势。 相似文献
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被业界称为注塑成型工艺第2次革命的气体辅助注射成型技术能解决或改善部分传统注塑成型方法的难点。本文介绍了气体辅助注射成型技术的基本机理及工艺控制过程,其中气体压力、注射压力、注射时间、气针与气道的位置尺寸等均对成品质量影响很大,列举了2个工艺实例,细述了传统注射成型与气辅注射成型的区别。 相似文献
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Modeling of plasticization during injection molding has been a complex issue, particularly for the solid conveying zone. This can be further complicated by break‐up of the solid‐bed due to the reciprocation motion experienced in injection molding. The break‐up of the solid‐bed can introduce molding quality problems such as inhomogeneities in parts. A transparent barrel system has been set up for injection molding to observe the solid‐bed break‐up mechanism and the conditions that influence this process. This paper summarizes some solid‐bed break‐up results relevant to injection molding. These results may be useful to the modeling community for experimental verification of their simulations, and to the molding community for setting up molding conditions to prevent the occurrence of solid‐bed break‐up. Polym. Eng. Sci. 44:1313–1318, 2004. © 2004 Society of Plastics Engineers. 相似文献
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基于自制的聚丙烯/玻璃纤维(PP/GF)复合材料,研究了复合材料不同配方与注塑工艺之间的关系.结果表明,注射成型加工时,PP/GF复合材料的配方组成不同,对注塑工艺条件和制品的性能都有较大的影响,因此应根据PP/GF复合材料的不同配方采用不同的注塑工艺条件.加有改性剂或偶联剂的PWGF复合材料注塑时的塑化温度、注塑压力、保压压力和保压时间及注射成型后的冷却时间均高于未加改性剂的PP/GF复合材料. 相似文献
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注塑成型条件对聚甲醛制品冲击性能的影响 总被引:1,自引:0,他引:1
用精密注塑机加工成型聚甲醛制品,考察了注塑成型条件如注射压力、注射时间、冷却时间、模具温度、后处理条件等对制品冲击性能的影响,找到了最佳工艺条件,制得了冲击性能优良的聚甲醛制品。由扫描电镜观察、结晶度测定和X射线衍射分析表明,聚甲醛制品的冲击韧性与其局部缺陷、裂纹、结晶度、晶粒大小等有关,只有改善制品的均匀性,减少局部缺陷的产生控制结晶度和晶粒大小在适当范围,才能制得冲击性能优良的制品。 相似文献
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高流动性快速固化酚醛注塑料的研制 总被引:2,自引:0,他引:2
介绍了一种高流动性快速固化酚醛注塑料的配方、制备工艺及其成型时间和流动特性。采用高邻位酚醛树脂为基质,复配复合稳定剂,优化辊炼工艺,制备了高流动性快速固化酚醛注塑料。该注塑料具有优异的流动性能,同时可快速成型,且不损失酚醛注塑料固有的力学性能、热性能及电性能。 相似文献
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《Ceramics International》2016,42(8):9475-9481
A powder injection molding process to fabricate a high-aspect-ratio piezoelectric microarray was developed. The reverse shaped sacrificial mold insert was developed by X-ray micromachining, and then insert-type injection molding was conducted to fabricate the piezoelectric microarray structure. For the micro-powder injection molding, rheological properties of the powder binder mixture were evaluated and analyzed. The measured flow behavior exponent was 0.44 and the flow activation energy was 83 kJ/mol−1. Based on the analyzed rheological property, injection molding conditions were optimized. The rheological property and the injection molding conditions were crucial to ensure complete filling. Using the optimized conditions, two high-aspect-ratio piezoelectric microarrays were fabricated: (i) 20-μm patterns with 1:5 aspect ratio and (ii) 40-μm patterns with 1:10 aspect ratio. 相似文献
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The process conditions have important influence on final part quality in injection molding, and how to get optimum process conditions is the key to improving part quality. Sinkmarks on the surfaces of injection-molded parts is one of the problems that limit the overall success of injection molding technology, and the presence of sinkmarks significantly impairs the surface quality of injection molded parts. A combination method of artificial neural network and genetic algorithms is proposed to optimize the injection molding process, and the processing parameters of a refrigeratory top cover are optimized using the combining method to minimize the sinkmarks on the part. The results indicate the combining method is an effective tool for the process optimization of injection molding. 相似文献