对快速加热循环注塑模具的热应力，变形，疲劳寿命的研究

对快速加热循环注塑模具的热应力，变形，疲劳寿命的研究(中文4800字,英文3100字)
摘要：  快速加热成型周期（RHCM）是一种新型注塑成型工艺。它可以被有效利用来防止很多在常规注射工艺中的产品的缺陷，在这篇论文中，这组大尺寸液晶电视被认为是一个例子，RHCM注塑模热，变形，疲劳分析模型被建立了。首先，通过分析该RHCM模具传热过程，对模具型腔表面的温度分布进行了研究。其次，通过数值模拟，获得RHCM模具的应力和变形的趋势。这表明固定模具插入与固定了模具板的固定模式对模具的热应力和变形有很大的影响。因此，提出固定模具插入的一个新固定模式，它可有效降低由温度变化引起的变形。最后，估算出在不同固定模式下的模具寿命，并且提出能够提高RHCM模具寿命的合理建议。工程中的应用证明，这是通过使用被建议的固定模式来提高RHCM模具寿命的一个非常有效的方法。
关键词快速加热循环成型。数值模拟、传热、热疲劳

Research on thermal stress, deformation, and fatigue lifetime of the rapid heating cycle injection mold
Abstract：
 Rapid heating cycle molding (RHCM) is a novel plastic injection molding process. It can be used effectively to prevent many defects of products produced in conventional injection molding process. In this paper, the panel of large-size liquid crystal display TV was taken as an example. Thermal, deformation, and fatigue analysis models for RHCM injection mold were established. Firstly, by analyzing the heat transfer process of the RHCM mold, the temperature distributions on the mold cavity surface were studied. Secondly, through numerical simulation, the tendency of the stress and deformation of the RHCM mold was obtained. It showed that the fixing mode between the  stationary mold insert and the stationary mold plate had a great influence on the thermal stress and deformation of the mold. As a result, a new fixing mode for the stationary mold insert was proposed which could effectively decrease the deformation caused by the temperature changing. Lastly, the lifetime of the mold under different fixing  modes was evaluated, and reasonable suggestions which could improve the lifetime of RHCM mold were also proposed. Application in engineering proved that it was a very effective way to improve the lifetime of RHCM mold by using the suggested fixing mode.

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