共查询到18条相似文献,搜索用时 94 毫秒
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根据硅单晶炉真空系统技术特点,从炉内真空系统的抽气、充气控制等方面进行改进和完善,并采用带有前馈的PID算法实现压力的自动控制。结合工业PLC和人机界面进行编程,在实际工业中的应用表明,该压力自动控制系统可保证炉内真空达到高稳定性,拉出高品质单晶。 相似文献
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新型密封元件的结构设计与应用 总被引:1,自引:0,他引:1
论述了密封元件的特性要求,分析了工程陶瓷材料的为密封元件的优良特性,设计出了两种新型密封元件结构,阐述了其工作原理及特点,并将其应用于工业控制阀中。 相似文献
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机械传动系统是单晶炉的重要组成部分,它主要包括坩埚升降与旋转系统、籽晶升降与旋转系统等等。本文详细论述了这两种传动系统的典型方案及其传动机理,最后阐明各单晶体生长方法所要求的传动系统。 相似文献
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吴世海 《机电产品开发与创新》2012,25(2):38-39,56
介绍了单晶炉的主要机械结构以及气缸的基本知识,根据目前单晶炉设备所需要的自动化程度的不断提高.介绍了双作用气缸在单晶炉中翻板隔离阀处阀盖开、关机构上的应用。 相似文献
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通过对SGl3Cr4M04Ni4V钢真空渗碳过程的主要影响因素进行试验分析,初步摸索了各工艺参数之间的关系,为提高该钢种真空渗碳热处理质量提供了试验数据。 相似文献
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该文就炼油厂常减压装置中加热炉扩容改造中出现的物料出口温度控制不稳定的问题进行了分析,指出了旧的前馈一负反馈控制系统存在的问题,针对加热炉扩容后出现的控制大滞后问题提出了解决办法。选用霍尼韦尔可编程调节器,采用前馈一增益自适应的Smith预估补偿控制算法,满足了工艺要求,使加热炉出口温度的控制平稳,达到了预期的效果。 相似文献
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F. Z. Fang G. X. Zhang 《The International Journal of Advanced Manufacturing Technology》2003,22(9-10):703-707
According to the hypothesis of ductile machining, brittle materials undergo a transition from brittle to ductile mode once a critical undeformed chip thickness is reached. Below this threshold, the energy required to propagate cracks is believed to be larger than the energy required for plastic deformation, so that plastic deformation is the predominant mechanism of material removal in machining these materials in this mode. An experimental study is conducted using diamond cutting for machining single crystal silicon. Analysis of the machined surfaces under a scanning electron microscope (SEM) and an atomic force microscope (AFM) identifies the brittle region and the ductile region. The study shows that the effect of the cutting edge radius possesses a critical importance in the cutting operation. Experimental results of taper cutting show a substantial difference in surface topography with diamond cutting tools of 0° rake angle and an extreme negative rake angle. Cutting with a diamond cutting tool of 0° rake angle could be in a ductile mode if the undeformed chip thickness is less than a critical value, while a ductile mode cutting using the latter tool could not be found in various undeformed chip thicknesses. 相似文献
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Zhen-Zhe Li Yun-De Shen Hui-Lan Xu Jae-Woo Lee Kwang-Su Heo Seoung-Yun Seol 《Journal of Mechanical Science and Technology》2008,22(11):2213-2217
A new method using the response surface method and optimization technique has been developed instead of the original method
based on trial and error. In order to construct a response surface, thermal analysis was performed under the condition of
using the calculated thermal conductivity of the insulator in a previous study. In order to set up the response surface, the
D-Optimal method was used in the process of selecting experimental points. Using a weighting factor, an optimization study
was carried out under the condition of satisfying user requirements. Finally, the merits and drawbacks of the new method were
described by comparing with the optimal design method based on the thermal analysis database which was developed in a previous
study. The optimal results show that the developed method can be used to design an energy efficient, low manufacturing cost,
high temperature vacuum furnace with avoiding unnecessary iterative manufacturing, and anticipating the performance before
manufacturing.
This paper was recommended for publication in revised form by Associate Editor Ohchae Kwon 相似文献
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基于遗传算法的单晶炉热场温度控制系统 总被引:1,自引:2,他引:1
介绍了以AT89C51单片机为核心的单晶炉热场温度控制系统的设计与实现方法,提出了一种基于遗传算法的PID参数寻优方法。仿真研究结果表明,系统具有良好的控制性能。 相似文献
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通过理论分析和实验研究,详细讨论了磁控人体胶囊式无线内窥微机电系统设计中的结构设计问题.首先根据无线内窥镜的使用环境和微型化要求,设计了合理的镜头,依照图像传感器采样照度确定了照明装置,选用了无线磁控式的控制方式实现系统的定点工作.然后对研制出来的内窥镜样机进行了离体和活体动物实验,实验中采集到的图像表明,此无线内窥镜的结构设计方案是可行的. 相似文献