基于Moldflow的洗衣机外桶模具设计与优化

发布时间：2018-01-31 03:58

本文关键词： 洗衣机外桶设计标准浇注系统冷却效率　出处：《湖北工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：洗衣机外桶的成型方式为注塑成型,为了达到承载内筒、固定电机、搭载水管的目的,所以外桶一般尺寸较大,且本体上存在许多复杂的承载结构,致使制造模具的成型、浇注、冷却系统比较复杂,传统的注塑模具设计主要为模具设计结构工程师使用自己的模具设计经验来初步设计模具,然后使用自己的模具设计经验对关键结构进行校核,直到试模的时候才能确定模具的设计是否合理,一套模具一般要经过多次试模、修模才能达到设计要求,与利用CAE分析软件进行模具设计的现代模式形成鲜明对比,基于Moldflow模具设计分析软件对外桶模具进行分析,达到优化模具结构的目的,本文主要研究内容为:(1)阐述了课题提出的目的和意义,对模具设计的国内外发展动态进行了分析,对国内模具设计存在的不足进行剖析说明,总结出我国模具设计与国外发达国相比存在的不足,确定了论文的主要研究内容。(2)利用牛顿广义相对论对熔融状态下的塑料的填充过程进行理论说明,利用连续性方程搭建出流体的物理模型,阐述CAE分析理论依据;浇注系统、顶出系统、冷却系统是模具的三大系统,设计过程比较复杂,通过对文献的整理,对三大系统的设计标准做出总结。(3)为确定模具的最佳热流道浇注系统,根据流变学设计,对热流道尺寸进行设计计算,然后利用Moldflow分析软件,对外桶的浇口位置进行预分析,并通过MPI/Flow模块对塑件的填充时间、气穴、熔接线、锁模力及体积收缩率的分析得出浇注系统的最佳方案。(4)为提高冷却效率,利用MPI/Cool分析模块对外桶冷却系统进行优化分析,将滑块上的冷却系统改为多层的立体布置,外桶底部的冷却水道重新排列,缩短水道流程,增加冷却水道,优化后冷却用时21.45s,较优化前35s,提高冷却效率38.7%。
[Abstract]:The outside barrel of washing machine is formed by injection molding. In order to carry the inner cylinder, the fixed motor and the water pipe, the outside barrel is larger in size and there are many complex bearing structures on the body. The molding, pouring and cooling systems are more complex. The traditional injection mold design is mainly for the mold design structural engineers to use their own mold design experience to design the mold. Then use their own die design experience to check the key structure, until the time of mold testing can determine whether the mold design is reasonable, a set of dies generally need to try several times, mold repair can meet the design requirements. In contrast to the modern mode of mould design using CAE analysis software, the die design analysis software based on Moldflow is used to analyze the die and mould of external barrel, and the purpose of optimizing the mold structure is achieved. The main research content of this paper is: (1) the purpose and significance of the subject are expounded, the development trends of die design at home and abroad are analyzed, and the shortcomings of die design in China are analyzed and explained. Compared with the developed countries, the main research contents of this paper are determined. (2) the filling process of plastics in molten state is explained theoretically by Newton's general relativity. The physical model of fluid is built by using continuity equation, and the theoretical basis of CAE analysis is expounded. Pouring system, ejection system and cooling system are the three major systems of mould, the design process is more complex, through the collation of the literature. In order to determine the best hot runner gating system of the mould, according to the rheological design, the size of the hot runner is designed and calculated. Then using the Moldflow analysis software, the gate position of the external barrel is pre-analyzed, and the filling time, cavitation and welding line of the plastic parts are analyzed through the MPI/Flow module. In order to improve cooling efficiency, MPI/Cool analysis module was used to optimize the external barrel cooling system. The cooling system on the slider is changed into a multi-layer arrangement, the cooling channel at the bottom of the outer bucket is rearranged, the flow of the waterway is shortened, the cooling channel is increased, and the cooling time after optimization is 21.45 s, which is higher than that before the optimization 35 s. Increase cooling efficiency 38.7%.
【学位授予单位】：湖北工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ320.52;TM925.33

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