【作者】 花丹红；

【导师】 刘红；

【作者基本信息】 浙江工业大学 ， 机械电子工程， 2009， 硕士

【摘要】 热板是塑料和橡胶注射机的不可缺少的模具加热元件,目前注射机中所使用的热板,以热管作为热源,并按一定的热功率分布(即在热板中适当的位置)加热模具。在热板的适当位置放置热电偶,当温度达到生产要求时,系统通过热电偶自动控制温度,使模具温度保持在生产要求的温度范围内,并且要求热板表面温差小。但一直以来,热板温度控制精度的合理性和表面温差大是影响电热板使用性能的两个主要问题。本论文将采用CAE技术,研究热板温度场分析的有效计算方法,为模具热板提供设计方法及加热工艺。论文将根据热板的特殊性,探讨热电偶的合理位置,设计电热管的功率分布和布局,研究热板加热工艺,使热板温度达到指定温度而且分布均匀。通过计算机模拟计算,得到可行方案并进行实验,验证数值计算的正确性,研究结果解决了热板温度控制精度的合理性和表面温差大两大难题。研究内容包括:1、热源描述点、柱、线型热源模型的建立与研究,建立热传导的传热模型。2、有限元建模对上下热板依据其结构特点进行有限元建模并合理简化。3、热板温度场分析方法温度载荷与边界条件的处理,建立有限元温度分析模型,进行温度场求解。4、热板温度场实验根据分析结果,搭建实验平台,验证有限元计算结果的合理性。5、热板温度场优化设计在实验验证有限元计算结果合理性的基础上,采用正交优化设计方法,获得最佳热管功率、位置分布,以及热电偶位置。更多还原

【Abstract】 Hot plate is indispensable heating element of the plastic and rubber injection machine. Hot plate is hot tube as a source of heat in the injection machine. Hot plate heats the mold on the basis of the power distribution.Thermocouple placed in the hot plate. The system automatically controls the temperature by the thermocouple, so that mold temperature can be maintained in the range of the production requirements. The temperature control precision and surface temperature are two main problems in the hot plate.Effective calculated method of temperature field analysis was studied on the hot plate by CAE technologies. It provides design method and heating process for the mold. According to the specificity of hot plate in this paper, reasonable location of the thermocouple is discussed, power distribution and layout are designed, heating process of the hot plate is studied, so that hot plate temperature reaches the specified temperature and distributes. Feasible scheme has been got by computer simulation and the result is verified by experiments. The two problems of the temperature control precision and surface temperature has been solved.Study includes the following:1. Source descriptionPoints、columns and linear heat source model has been set up and researched.2. Model of FEMModel of FEM has been set up on the basis of the structural characteristics of hot plate and the reasonable simplification.3. The method of the temperature field analysisAccording to the temperature load and boundary conditions, Analysis model of FEM has been set up and the temperature field has been solved. 4. The Temperature field experiment of hot plateAccording to the result of Analysis model of FEM, the experimental platform has been built and the result of FEM has been verified.5. Optimal Design of hot plate temperature fieldIt is proved that the result of the finite element calculation is reasonable, according to the experimental results. The best heat pipe power, layout, as well as location of the thermocouple have been obtained by using the orthogonal design method.更多还原