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本文分析了柱式平板硫化机热板之间不平行对使用性能的影响,提出了解决柱式平板硫化机热板间平行度的有效措施及调整方法。 相似文献
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蒸气热板平板硫化机在实际运行过程中 ,除存在上下层热板温差较大的问题外 ,还经常发生蒸气输配管道堵塞现象 ,由此常影响热板的工作温度 ,造成产品的质量缺陷 ,特别是在疏水器安装使用不当时尤为突出 ,为了确保平板硫化机热板达到生产工艺所必需的温度 ,通常采取乏汽放空或常开疏水器旁通管以维持生产 ,这种现象也常常出现于其它用汽设备。为了在确保平板硫化机热板工作温度正常和用汽设备运行正常的前提下合理地使用蒸汽及回收利用冷凝水余热 ,下面就平板硫化机的蒸汽加热原理 ,蒸汽输配管道及疏水装置的合理性作如下分析。1 热板蒸汽加… 相似文献
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(二) 普通平板硫化机普通平板硫化机当前的发展动向是: 1.国外一些厂家在结构方面普遍采用油压电热,减少热板层数并趋向单层多模腔,油缸强制开模和机械出模,也有考虑利用机器人操纵机器。但平板硫化机的主要问题之一是如何解决高温和繁重的操作条件,为此,一些国家的平板硫化机制造厂家研制了能自动进出模的平板硫化机作为标准产品出售,国内西北橡胶制品研究所也曾作过研究。 2.采取各种措施,使热板表面温度均匀一致。尽量减少误差,以提高制品硫化质量。一般要求,热板表面温度误差应控制在 相似文献
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用平板硫化机硫化大型模型橡胶制品,因模具大而重难于工艺操作,而且易对人身、设备、模具等造成损伤。本文结合我厂实践,介绍了平板硫化机热板表面的保护,大型模具的启模,模具进出平板硫化机用的辅助装置以及平板硫化机蒸汽热板分区加热的实用技术。 相似文献
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用平板硫化机硫化大型模型橡胶制品,因模具大而重难于工艺操作,而且易对人身,设备,模具等造成损伤。本文结合我厂实践,介绍了平板硫化机热板表面的保护,大型模具的启模,模具进行平板硫化机用的辅助装置以及平板硫化机蒸汽热板分区加热的实用技术。 相似文献
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目前,电加热硫化机热板普遍存在加热不均匀、温差大、加工困难等问题,对此,采用有限元软件对硫化机热板进行热分析,以对硫化机热板的结构进行优化改进。首先,采用ANSYS软件对目前常见的向心式直插热板进行热分析;其次,提出更易加工的硫化机热板优化方案——平行式直插热板,并对此进行热分析;第三,将两种方案的分析结果进行对比,表明改进的平行式直插热板加热更均匀,温差更小;最后,将改进后的方案做成试验热板进行实验,结果表明改进后的热板加热均匀,符合轮胎硫化的工艺要求,实验结果与有限元分析结果相符,验证了本文提出的基于ANSYS软件的热板热分析方法的正确性。 相似文献
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本文分别介绍了国内硫化橡胶模型制品、胶板、橡胶输送带及传送带用的平板硫化机的现状。用国内外对比的方式,对平板硫化机在规格、材料、档次水平、热板温差等方面进行了总结。并认为平板硫化机的发展趋势是材料高强度、高刚度化,产品高档化,热板高压、高温化,液压系统高压化,输送带平板硫化机大型化。 相似文献
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应用热分析有限元软件模拟输送带蒸气加热热板边界的温度场,进行有限元分折,得出蒸气热板边界温度场分布图,利用MATLAB软件对数据进行拟合处理,得到数据拟合图和相应的拟合公式,为蒸气加热热板边界的温度场研究提供了参考. 相似文献
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The hot plate test is commonly used to determine first order activation energies for energetic material. It is demonstrated that the results of this test depend significantly on the conductivity of the hot plate. Furthermore, it is demonstrated that the interface between the hot plate and the energetic material also plays a significant role in the activation energies and ignition temperatures obtained using this method. 相似文献
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设计了一种4层叠层模用于实现游戏机手柄的高效率注塑生产,解决了塑件成型时在保证塑件成型精度的基础上,单次注塑量产数量4倍倍增难题。4层叠层模的结构由4层结构相同的单层模具通过一定的空间组序排列组装后,应用立式注塑机来进行注射成型。单层模结构设计采用两板式2次开模热流道浇注两板模形式,第一次开模用于热流道嘴与塑件的冷流道部分分离,第二次开模用于塑件从型腔镶件中脱模脱出。为解决单层模做4层叠层组合后,顶出板无动力顶出的问题,在单层模的模架模板侧边对称设置了拉杆,将单层模在开模动力转化为单层模中顶出板的顶出拉力,巧妙地解决了单层模做4层叠层安装后各单层模的顶出元件顶出板无推动力的问题。模具结构布局及机构的驱动设置设计合理,有较好的工程设计参考意义。 相似文献
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Ann R. Fornof Christy Tyberg Jeffrey Hedrick Kang-Wook Lee Stephen Cohen 《Polymer Bulletin》2002,48(2):167-172
Summary
The structure and properties of Hydrido Organo Siloxane Polymer (HOSP) as a function of cure conditions have been analyzed.
Fourier transform infrared spectroscopy, dielectric constant, and mechanical properties all indicated a dependence on the
bake sequence of HOSP. FT-IR analysis indicated that the ratio of Si-O bonds in a caged (or ordered) configuration to Si-O
bonds in a non-caged (or disordered) configuration changed as a function of both pre-cure hot plate bake conditions and cure
temperature. The dielectric constant was lower for samples that received a high temperature hot plate bake (400°C) prior to
the furnace cure independent of the furnace cure temperature, compared with samples that did not undergo the high temperature
hot plate bake. In addition, adhesion was significantly improved with an increase in the cure temperature from 400°C to 430°C.
These results indicate that both pre-cure hot plate bake conditions, and cure temperature affect the structure and therefore
the properties of HOSP. Optimum properties are achieved when both the 400°C hot plate bake and a 430°C furnace cure are employed.
Received: 8 January 2002/Revised version: 27 February 2002/ Accepted: 27 February 2002 相似文献
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提出一种应用废机油生产钢板热轧乳化油方法,运用本方法生产的钢板热轧乳化油各项性能指标都完全满足工业生产的要求,为废机油综合回收应用提供了一条新的有效途径。 相似文献
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Low filling efficiency and large thermal stress are two important problems that limit the wide use of hot embossing especially in fabricating high aspect ratio patterns. Two types of flow barriers, the first being an accessorial slot on the mold (SFB), the other was a block on the hot embossing machine (BFB), were designed to enhance polymer filling and their performances were simulated with the finite element method. The numerical simulation results show that two kinds of flow barriers can also accelerate the polymer filling speed and improve filling efficiency. The BFB has a better promoting effect and can be easily used as a quasi close‐die embossing process. The shrinkage of the polymer and mold is made uniform with a designed polymer grip holder to minimize the thermal stress. The polymer was clipped at a temperature in a cooling step and its deformation was fixed; thus, the shrinkage of the polymer can be equal to the mold at a special temperature. An improved hot embossing machine was designed and the hot embossing process was modified to satisfy these requirements. At last successful fabrication of the light guide plate verified the improvements. POLYM. ENG. SCI., 2013. © 2012 Society of Plastics Engineers 相似文献