ANSYS滚珠丝杠副可靠性试验台结构设计
毕业论文关键词 滚珠丝杠 加载机构 静力分析 结构优化
Title The Structural Design of Reliability Test-bed of Ball Screw Mechanism
Abstract In this paper, the structure of the existing ball screw reliability test bed is studied so that the structure and the functions of the test apparatus can be fully grasped. And then it is necessary to focus on the vital load mechanism of the test bed and understand the design requirements, structure and functions of the load mechanism. At last, the problems in the load mechanism will be found, and the load mechanism needs to be optimized for maximum performance. The force analysis of the important parts of the load mechanism is carried out firstly, and then according to the force analysis, the structural static analysis of these parts is carried out through the simulation software ANSYS. After the analysis, it is found that the part, shouzai-guding, due to the thin wall structure, does not have sufficient strength, and is easy to fracture. When optimizing the structure of the part, there is need to take out the originally-used sleeve, so the aperture of part increases. Finally, it is successful to design the new part and increase the strength of the part.
Keywords ball screw load mechanism static analysis structure optimization
目次
1引言...1
1.1滚珠丝杠副简介..1
1.2滚珠丝杠副的可靠性研究现状...1
1.3可靠性实验装备相关现状.2
2试验台的介绍..4
2.1试验台整体介绍..4
2.1.1滚珠丝杠副可靠性试验装置需满足的要求4
2.1.2试验台总体设计方案.4
2.1.3试验台运行基本原理.5
2.2加载机构....6
2.2.1加载机构的设计要求.6
2.2.2加载机构的工作原理和作用功能.6
2.2.3加载机构主要零部件的选型....8
3受力分析和模型建立...11
3.1关键零件的选取11
3.2关键零件的受力分析..11
3.2.1受载－固定11
3.2.2支架..12
3.2.3导轨滑块....14
3.2.4装配体的受力分析...14
3.3零件和受力在仿真软件ANSYS中的建立..16
4利用仿真软件ANSYS对零件进行静力分析...18
4.1静力分析的结果18
4.1.1工况一（拉载荷）下的静力分析的结果..18
4.1.2工况二（压载荷）下的静力分析的结果..22
4.2优化方案和优化分析..26
结论....30
致谢....31
参考文献....32
1 引言 1.1 滚珠丝杠副简介 滚动功能部件产品主要包括：滚珠丝杠副、滚动直线导轨副、滚珠花键、滚珠导套、直线运动部件、坐标工作台、自锁器等[1]。其中滚珠丝杠副是一种高精度、高效率和高使用寿命的直线驱动单元，被广泛应用于机床、汽车和航空航天等领域，其使用寿命与使用性能可靠性非常重要。所以滚珠丝杠副将是推进我国制造业现代化、数控机床高速化的重要因素[2]。驱动线速度达到60 m/min 以上， 加(减)速度在0 .5 g ～ 1 .5 g ，精度达到国家标准GB/T18587 .1 -3(相当于ISO3408)中的P3 级以上，性能指标达到设计要求者，就可称之为精密高速滚珠丝杠副[3]。滚珠丝杠副主要由丝杠、滚珠、螺母等组成，滚珠丝杠副的精度下降，会导致传动质量的降低，最终会因引起失效，影响滚珠丝杠副的功能可靠性。