共查询到19条相似文献,搜索用时 125 毫秒
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用于输变电线路的硅橡胶绝缘子大多采用注射成型工艺生产。由于注射时的压力较大,成型后的制品与模腔挤压得非常紧,目前尚无法使制品自动脱离模具,一般采用人工脱模。存在这种现状的主要原因是复合绝缘成型技术应用时间较短,目前一次成型的绝缘子产品长度不超过1.5,由于长度较小,脱模所需的力尚在人力所及范围,因而人工脱模一直沿用至今。 相似文献
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复合材料闭模成型工艺技术具有成型产品性能优良、质量稳定、生产效率高和环境友善等诸多特点,本文对复合材料天线罩产品采用闭模成型工艺的应用材料、树脂流动、充模过程和适用情况进行了阐述和说明.天线罩产品采用闭模成型工艺,选择满足其性能和工艺双重特性的材料非常重要,通过树脂流动趋势和仿真分析来指导工艺设计,可有效的避免工艺实施... 相似文献
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介绍了复合支柱绝缘子内绝缘芯棒在特高压电站中的情况。复合支柱绝缘子主要由三部分组成:内绝缘芯棒、硅胶外套及伞裙、两端的连接金具。着重介绍了复合支柱绝缘子中起关键承力作用的内绝缘芯棒。从内绝缘芯棒的分类、各自的优缺点、成型机理、制造工艺方法等方面进行了评述,为今后特高压复合支柱绝缘子用内绝缘芯棒选材提供参考。 相似文献
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为解决复杂复合材料构件的整体一次成型问题,提高复合材料制品的整体性能,降低生产成本,本文采用硅橡胶制备软模,利用其柔韧性解决常规模具无法一次成型的问题。并通过软模/真空灌注工艺制备了带复杂孔圆盘,以验证其工艺可行性。通过比较与其他工艺制备的复合材料性能,探讨其使用前景。结果表明,采用软模/真空灌注工艺可一次整体成型带复杂孔圆盘等复杂构件,制品性能稳定。 相似文献
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《高科技纤维与应用》2019,(4)
正本发明提供一种中空类碳纤维产品的成型工艺,涉及碳纤维制备技术领域。包括以下步骤:将聚苯乙烯泡沫原料灌入芯模模具内,放置在真空热压炉中成型;将所述芯模套上气袋;根据芯模形状将玻璃布和碳布包覆在芯模上,得到产品 相似文献
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针对某汽车中控面板内饰件制程工艺需要采用模内装饰(IMD)工艺中的模内贴膜(IMF)技术被覆桃木纹理三维复杂曲面薄膜的生产要求,设计了成型所需膜预成型模具、预成型膜片冲裁模具、注塑模具3副组合模具。膜预成型模具应用热压与真空吸附的办法,将加热后的膜片紧贴于型芯镶件上而后成型;结合预成型膜片侧面需要卷边包胶的需要,设计了侧抽芯滑块+气缸组合机构方式的侧面裁切和正面冲切的预成型膜片冲裁成型模具;注塑模具采用热流道延伸嘴与冷流道潜伏式进浇三板模,模腔布局一模一腔,两次开模,水冷,顶出采用顶针和顶管联合顶出方式。膜片预成型模具有效地解决了膜片三维成型困难问题,预成型膜片冲裁成型模具有效地解决了IMD工艺中三维曲面包边冲切成型的难题。所设计的组合模具有效地提高了中控面板IMF产品的膜成型良品率,为同类产品的设计和生产提供了有益参考。 相似文献
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本文根据一种涂料包装桶注塑工艺调试实验结果,对桶状深型腔充模时出现的“排气不良”现象进行工艺分析,提出其产生的原因及相应解决方法,这对于形状类似的注塑产品的模具设计、成型工艺调试有重要意义。 相似文献
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Stereolithography is a process in which a photopolymerizable resin is used to make parts. This method is used here to produce mold inserts for small injection molding runs. This paper focuses on the effects of the heat due to the injection of the polymer on these mold inserts. As the number of shots increases, the degree of cure of the insert changes. Differential Scanning Calorimetry (DSC) was used to determine the thermal property changes of the material. The evolution of the ejection forces for different post‐cure treatments was investigated. The ejection force decreased with increasing cure of the mold inserts. 相似文献
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The development of new composite product for an application through liquid composite molding (LCM) process simulation requires submodels describing the raw material characteristics. The viscosity during resin cure is the major submodel required for the effective simulation of mold-filling phase of LCM process. The viscosity of the resin system during mold filling changes as the cure reaction progresses. Applied process temperature also affects the viscosity of the resin system. Hence, a submodel describing the resin viscosity as a function of extent of cure and process temperature is required for the LCM process simulation. In this study, a correlation for viscosity during curing of medium reactive unsaturated polyester resin, which is mostly used for the LCM process, has been proposed as a function of temperature and degree of cure. The viscosity and the degree of cure of reacting resin system at different temperatures were measured by performing isothermal rheological and isothermal differential scanning calorimetry experiments, respectively. A nonlinear-regression analysis of viscosity and degree of cure data were performed to quantify the dependence of viscosity on temperature and extent of cure reaction. Comparisons of model solutions with our experimental data showed that the proposed empirical model is capable of capturing resin viscosity as a function of extent of cure and temperature qualitatively as well as quantitatively. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012 相似文献
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The curing kinetics and the resulting viscosity change of a two‐part epoxy/amine resin during the mold‐filling process of resin‐transfer molding (RTM) of composites was investigated. The curing kinetics of the epoxy/amine resin was analyzed in both the dynamic and the isothermal modes with differential scanning calorimetry (DSC). The dynamic viscosity of the resin at the same temperature as in the mold‐filling process was measured. The curing kinetics of the resin was described by a modified Kamal kinetic model, accounting for the autocatalytic and the diffusion‐control effect. An empirical model correlated the resin viscosity with temperature and the degree of cure was obtained. Predictions of the rate of reaction and the resulting viscosity change by the modified Kamal model and by the empirical model agreed well with the experimental data, respectively, over the temperature range 50–80°C and up to the degree of cure α = 0.4, which are suitable for the mold‐filling stage in the RTM process. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 77: 2139–2148, 2000 相似文献
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制备了一种低成本易成型的水溶性芯模,对其成型收缩率、压缩性能、水溶性及气密性进行了研究,结果表明采用石英砂制备的可溶性芯模成型前后具有良好的尺寸稳定性,在室温至120℃区间内压缩强度均高于3 MPa,浸泡在常温水溶液中1 min内能够快速溃散至砂粒状态,经表面封孔处理后能够达到VARI成型工艺对模具的气密性要求。通过在填充可溶性芯模的中空金属框表面进行VARI工艺验证试验,表明制备的水溶性芯模能够作为VARI工艺模具使用,且脱模简单方便,对制品表观质量基本没有影响,具有良好的应用前景。 相似文献
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