共查询到18条相似文献,搜索用时 125 毫秒
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针对三氯氢硅反应炉电阻加热方式存在的问题,提出采用工频电磁感应的加热方式,并通过试验及实际应用,证实了将工频电磁感应加热方式运用到三氯氢硅反应炉的加热上是完全可行的,而且经济实用. 相似文献
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研究电磁感应加热技术(简称电磁加热)在轮胎硫化机上的应用。在轮胎硫化机线圈板上开设若干圆孔以放置电磁线圈,并在线圈板上下设置隔热板,热板产生涡电流而感应生热,热量由热板传递到模具,实现对轮胎的硫化。电磁加热硫化可以保证轮胎硫化温度均匀,并节约能源,大幅提高轮胎的硫化质量。 相似文献
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注射机的料筒温度是决定塑料成品品质的一个关键因素。基于一个假设,即存在一个稳定的实主导极点,并且这个极点的阶数超过所设计的PID控制器的可调整参数的数量。提出了一种新的基于多主导极点方法的PID控制器,研究了注射机料筒温度的一阶积分时滞系统的鲁棒控制。利用Matlab求解特征方程对s的各阶导数组成的联立方程组,得到主极点和PID控制器的可调参数。在注射机注射速度系统的一阶积分时滞系统下进行了仿真实验,结果表明:设计方法具有良好的追踪性能和调节性能,并且鲁棒性良好,能够满足注塑机料筒温度控制的需求。 相似文献
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利用电磁感应辅助加热挤压膨化机对植物秸秆进行了膨化加工试验。研究结果表明:电磁感应辅助加热挤压膨化机利用高频转换器产生的高频电流,从而达到控制挤压膨化温度的作用。一级电磁感应加热,预热植物纤维,控制温度在80~110℃,二级电磁感应加热,为秸秆挤压膨化加工提供稳定的高温高压条件,控制温度在250~300℃。膨化量可达到200~400 kg/h,膨化产品粗纤维含量下降30%~50%,无氮浸出物含量在20%以上,代谢能提高近10倍。电磁感应辅助加热挤压膨化技术研究为形成工业化规模的秸秆膨化加工利用奠定了良好的基础。 相似文献
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基于ANSYS的注射机料筒感应加热温度场数值模拟 总被引:2,自引:0,他引:2
应用感应加热理论,利用麦克斯韦方程组和导热微分方程,并引入复矢量磁位,建立了电磁场与温度场耦合的有限元数学模型,利用大型通用有限元分析软件ANSYS对注射机料筒的感应加热过程进行了模拟分析.讨论了感应加热有限元分析中温度场与电磁场耦合、料筒材料物理参数对温度依赖性等关键技术问题的处理方法.分析了料筒的感应透热过程,得到了料筒内的温度分布状况以及温度随时间的变化规律.模拟分析了频率、线圈电流强度系数等参数对料筒温度控制的影响.通过得到的结果,了解感应加热温升过程和特点,从而为注射机料筒温度控制提供一定的依据以及为感应加热器的参数选取提供一定指导作用. 相似文献
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Soohong Kim Ching-Shin Shiau Byung H. Kim 《Polymer-Plastics Technology and Engineering》2013,52(11):1031-1037
During injection molding of micron or submicron scale features, incomplete filling frequently occurs, resulting from premature freezing of the polymer melt in contact with a cold mold. In order to overcome the filling difficulty without increasing the total cycle time, the mold surface temperature was raised rapidly by induction heating. A prototype mold insert with cooling channels was fabricated and integrated with a nickel stamp having nanoscale-grating structures. The nickel stamp surface was successfully heated from 25 to 258°C in 2.7 sec. Four different mold surface temperatures, 100, 150, 200 and 250°C, were tested to determine if the nanograting structures can be replicated with an optical quality cyclic olefin copolymer. Experimental results indicate that the nanocavities were successfully filled when the surface temperature reached 250°C, but mold release caused drag damages on the nanogratings. Further, coupled thermoelectromagnetic analyses were carried out to simulate the induction heating process of the nanostructured mold insert. The predicted surface temperature responses in general agree with the experimental ones and the simulation model can be used in the further development of process control and mold design in micro/nano molding. 相似文献
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S. Kanagalakshmi D. Manamalli M. Mohamedrafiq 《Chemical Engineering Communications》2016,203(4):452-462
The proposed real-time multimodel for the injection molding process mainly contributes to the barrel temperature control. Good control of the plastic melt temperature is very important for injection molding in reducing the operator setup time, ensuring product quality, and preventing thermal degradation of the melt. The controllability and set points of the barrel temperature also depend on the precise monitoring and control of the plastic melt temperature. Motivated by the practical temperature control of injection molding, this article proposes a multimodel-based proportional integral derivative (PID) control scheme in real-time and the simulation studies of the PID, fuzzy, and adaptive neuro fuzzy inference system (ANFIS) control schemes. The injection molding process consists of three zones, and the mathematical model for each zone is different. The control output for each zone controller is assigned a weight, based on the computed probability of each model, and the resulting action is the weighted average of the control moves of the individual zone controller. 相似文献
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陶永亮 《现代塑料加工应用》2012,24(2):52-55
介绍了模温机的结构、工作原理、分类和模温的作用。重点叙述了模温机在注塑聚碳酸酯、聚甲基丙烯酸甲酯、聚酰胺66/玻璃纤维、聚丙烯等的应用实例。为保证塑件质量,分别对1,2,3台模温机用法和冷水机的用法作了描述。 相似文献
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Fully-Coupled Numerical Analysis of High-Frequency Induction Heating for Thin-Wall Injection Molding
Hyeju Eom 《Polymer-Plastics Technology and Engineering》2013,52(10):1070-1077
In recent years, rapid mold heating has served to enable the injection molding of thin-walled parts or micro/nano structures. Induction heating is an efficient way to heat metal parts by means of an electric current that flows through a conductive material by electromagnetic induction. The present study covers a numerical investigation of high-frequency induction heating of an injection mold in order to rapidly raise the mold temperature. To take into account the effects of thermal boundary conditions of induction heating, a fully coupled numerical analysis effectively connecting electromagnetic field calculation, heat transfer analysis, and injection molding simulation was carried out. The proposed integrated simulation was applied to the injection molding of a thin-wall part, and its results were compared with experimental findings in order to verify the validity of the proposed simulation. 相似文献
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橡胶注射成型机的应用及新进展 总被引:2,自引:0,他引:2
简要介绍了日本KRV-60型橡胶注射成型机的主要结构和控制部件,主要技术参数和工艺参数及对胶料的要求和新进展。橡胶注压工艺具有高温快速硫化、节能及自动化程度高等优点,以橡胶注射成型机代替平板硫化机是橡胶加工业的发展方向。 相似文献
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注塑成型机是一种重要的塑料加工设备。由于该类设备长期处于连续运转状态,能耗极大,降低注塑成型系统的能耗已经成为今后技术发展方向。通过对注塑成型系统三个主要耗能部分进行分析,介绍了三种节能技术,以期降低注塑成型系统的能耗。 相似文献