双螺杆挤出机传动箱体的有限元模态分析及结构优化设计

发布时间：2018-01-05 20:21

本文关键词：双螺杆挤出机传动箱体的有限元模态分析及结构优化设计　出处：《南京农业大学》2012年硕士论文　论文类型：学位论文

【摘要】：双螺杆挤出机传动箱是动力源与工作装置之间的联接部分,承受着较大的力的传递作用。箱体本身是整个传动系统的主要承力部件,其工作环境比较恶劣。当整个机器在工作过程中,传动箱体受力状况非常复杂,传动箱内部齿轮和轴承到较大冲击,而这种冲击力会直接传递到箱体上,若箱体的刚度不足,就会发生变形,加速零件的磨损,产生噪音,影响整体的安全性和使用寿命,所以传动箱箱体本身应具有足够的刚度和强度。目前,利用有限元模态分析技术来预估机械结构的动态特性已成为有效途径之一,同时利用现代结构优化技术对传动箱在重量、变形、应力等方面的优化分析也正在日益普遍。这对提高产品质量、降低成本、缩短产品设计周期都具有十分重要的意义。本论文以南京某机械公司研制生产的双螺杆挤出机的传动箱为研究对象,运用有限元模态分析方法,对箱体的动态特性进行了研究,在此基础上对箱体做结构优化分析设计,力图减少其设计中存在的缺陷,以期达到产品优化设计要求。根据双螺杆挤出机箱体图纸,利用Pro/E建立几何模型,然后将模型导入ANSYS中进行模型修正、网格划分等处理。对传动箱体进行有限元静力学分析,校核了箱体的强度和刚度。对箱体进行有限元模态分析,使用ANSYS Workbench计算得到箱体的前十二阶自由模态和约束模态的固有频率和振型,根据这些模态参数对箱体性能的影响,指出箱体结构改进的方向。在前面进行的有限元分析的基础上,选取箱体结构的几个参数为变量进行优化分析,最后绘制出了箱体改进后的三维图。
[Abstract]:Double screw extruder gear box is connected between the power source and the working device of the transfer function under great stress. The box itself is the transmission system of the main load-bearing components, the working environment is bad. When the machine is in working process, transmission box stress state is very complex, and internal gear transmission bearing to a larger impact, and this impact will be directly transmitted to the case, if the lack of rigidity of the box, the deformation will occur, wear parts, acceleration noise, impact on the overall safety and service life, so the transmission box itself should have enough stiffness and strength.
At present, the analysis to estimate the dynamic characteristics of mechanical structure technology has become one of the effective ways for the use of the finite element modal, and the use of modern technology on the structure optimization of gear box in weight, deformation, stress and other aspects of the optimization analysis is increasingly common. To improve the product quality, reduce the cost, has very important significance to shorten the product the design cycle.
Double screw transmission box this paper takes Nanjing machinery company development and production of extrusion machine as the research object, using the finite element modal analysis method, the dynamic characteristics of the body are studied, based on structural optimization analysis and design of the box, try to reduce the defects existing in the design, in order to achieve the optimization of product design requirements.
According to the case of twin screw extruder using Pro/E drawing, establish geometry model, then the model correction model into ANSYS, mesh processing. Finite element static analysis of transmission box, check the strength and stiffness. The finite element modal analysis of the box, using ANSYS Workbench to calculate the box before twelve order free and constraint modal natural frequency and vibration mode, according to the influence of these parameters on the modal box performance, pointed out the direction of improvement. The structure of the finite element analysis in the front on several parameters selection box structure optimization analysis for the variables, finally draw the three-dimensional map improved.

【学位授予单位】：南京农业大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH132.4

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