【作者】 初起宝；

【导师】 董力群；

【作者基本信息】 北京化工大学 ， 化工过程机械， 2006， 硕士

【摘要】 随着木塑复合材料的发展，锥形双螺杆挤出机得到了广泛地应用。然而，用于加工木塑复合材料的锥形双螺杆(非双金属材料)的使用寿命较短，且国内外与其相关的研究文献很少。因此对用于加工木塑复合材料的锥形双螺杆磨损和使用寿命的研究具有重要的实用价值。 本文旨在对木塑复合材料锥形双螺杆流场和螺杆的磨损及使用寿命进行了理论分析研究。 为了研究不同螺杆构型对螺杆疲劳寿命的影响，运用专用的ANSYS软件分别建立了常规螺杆元件、开反向螺旋槽螺杆元件和开轴向沟槽螺杆元件流场的有限元模型，对流场进行了模拟计算，通过编程对计算结果进行了处理，分析了各流场的压力分布、速度分布和平均剪切应力，并把压力和平均剪切应力处理结果分别作用在相应的螺杆元件上，对各螺杆元件进行了应力分析和疲劳分析，并得出了增强螺杆耐磨性和提高螺杆寿命的方法。 本课题对整根螺杆进行了模态分析，得到了整根螺杆的前两阶固有频率和振型，结果表明螺杆在工作转速范围内不会发生共振现象。 本研究对加工木塑复合材料锥形双螺杆的设计有一定的理论指导和工程实用价值，并为后续的研究工作打下了良好的基础。更多还原

【Abstract】 With the development of wood-plastic industry, conical twin-screw extruders are expanding rapidly and applied widely. But at present, the using life of conical twin-screw for manufacturing composite is short. The open literature related to their studies is few in the world. It is significant to study on the wear mechanism about conical twin-screw.In this paper, flow simulation of conical twin-screw for manufacturing wood-plastic composite and using life of various conical twin-screw was studied.In order to study on the fatigue wear and using life of various screws, three flow models were built in ANSYS. Based on the calculated results, by programming, we get the pressure distribution, velocity distribution and average shear stress. According to results of flow simulation, fatigue wear and using life of conical twin-screws for manufacturing wood-plastic composite are studied. Wear-resistant technique and its application in conical twin-screw were also introduced in this paper.The model of screw for manufacturing composite is also analyzed .According to the analysis result, the screw in normal rotate do not occur resonate.Anyhow, here some elementary studies of wear mechanism about conical twin-screw were proposed. It made a good basis for further study in future.更多还原