D型单结绳打结器关键部件逆向设计与结构优化

发布时间：2018-04-14 04:31

本文选题：打结器 + 逆向工程　；参考：《内蒙古农业大学》2015年硕士论文

【摘要】：农牧业机械化标志着农牧业现代化的进步,而饲草生产机械化是农牧业机械化的重要组成部分,牧草收获已从传统人工收获方式发展到今天的自动捡拾压捆机械收获。打结器是压捆机械的核心部件,本文以9YFQ-1.9型正牵引跨行式方捆压捆机为例,分析其装配的D型打结器的工作原理,运用CATIA软件对打结器架体逆向建模,借助ANSYS workbench14.5软件对架体进行有限元分析,并对其进行结构拓扑优化。本文在分析打结器成结原理的基础上,针对打结器架体在工作中断裂的问题,分别对打结器正常工作和故障两种状态下的架体进行结构静力分析,并对架体进行结构拓扑优化。正常工作状态下的架体有限元分析显示,架体的等效应力和应变均符合设计要求；当夹绳盘故障导致蜗轮蜗杆无法工作时,有限元分析显示架体的应力和应变主要集中在架体蜗杆轴孔的腰部,与实际断裂部位相吻合。据此,运用Shape optimization工具对处理后的架体模型进行结构拓扑优化。在考虑装配尺寸和加工工艺的前提下,根据优化结果对架体三维模型进行修改,加厚了蜗杆轴孔壁,加宽了打结钳支座,并在两者之间增加加强肋。对优化后的架体进行故障状态的有限元分析,结果显示结构优化达到了预期效果。
[Abstract]:The mechanization of agriculture and animal husbandry marks the progress of the modernization of agriculture and animal husbandry, and the mechanization of forage production is an important part of mechanization of agriculture and animal husbandry.The knotter is the core part of the baling machine. This paper takes the 9YFQ-1.9 type forward traction straddle binding machine as an example, analyzes the working principle of the D type knotter assembled by it, and uses CATIA software to build the reverse model of the knotter frame.The finite element analysis of the frame is carried out with the help of ANSYS workbench14.5 software, and the structure topology is optimized.In this paper, based on the analysis of the formation principle of the knot holder, aiming at the problem of the fracture of the structure in the working process, the structure static analysis of the frame in the normal working state and the fault state of the knotting device is carried out, and the structural topology optimization of the frame body is carried out.The finite element analysis of the frame under normal working condition shows that the equivalent stress and strain of the frame all meet the design requirements.The finite element analysis shows that the stress and strain of the frame are mainly concentrated at the waist of the shaft hole of the worm, which coincides with the actual fracture position.Based on this, the structure topology of the processed frame model is optimized by using Shape optimization tool.On the premise of considering the assembly size and processing technology, the three-dimensional model of the frame is modified according to the optimized results, the worm shaft hole wall is thickened, the tie clamp support is widened, and the stiffening rib is added between the two.The finite element analysis of the fault state of the optimized frame shows that the structure optimization achieves the desired effect.
【学位授予单位】：内蒙古农业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S817.11

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