高等职业技术学校毕业设计基于 UG平台的偏心轴的加工分析及车削工艺的夹具设计姓名班级专业时间指导老师目录摘要----------------------------------------------------------------------- 3 Abstract-------------------------------------------------------------------- 4 1绪论 ----------------------------------------------------------------------- 61.1偏心轴车削加工的简介----------------------------------------------- 61.2 UG简介 ------------------------------------------------------------------ 61.3论文的主要工作-------------------------------------------------------- 6 2偏心轴的机械加工工艺规程------------------------------------------ 72.1 零件工艺分析---------------------------------------------------------- 72.2毛坯设计----------------------------------------------------------------- 82.3定位基准的选择-------------------------------------------------------- 92.4加工方法的选择------------------------------------------------------ 102.5加工顺序的安排------------------------------------------------------ 102.6加工工艺过程的确定------------------------------------------------ 102.7加工余量及工序尺寸的确定----------------------------------------11 3夹具设计----------------------------------------------------------------- 123.1 偏心轴装配----------------------------------------------------------- 123.2 基于 CAD的定位夹紧元件设计 ---------------------------------- 174 结语 -------------------------------------------------------------------- 19致谢---------------------------------------------------------------------- 20参考文献------------------------------------------------------------------- 21摘要机械传动中，由回转运动变为往复运动，往往是由偏心轴和曲轴来完成的。
机械的开会和缩紧也往由偏心零件来完成的，可见偏心零件在机械制造中运用的非常广泛。
本课题来源于生产实践，充分利用所学的机械制图、机械设计及机械制造等课程，了解针对偏心工件的特点，通过UG软件，利用该软件制图功能，完成偏心工件类零件偏心外圆车组合夹具的设计。
通过分析偏心工件类零件传统加工手段和三爪微调车削法, 得出了加工困难、效率低、互换性差及精度不易保证的结论,针对其缺陷提出了高效加工高精度偏心工件类零件的工艺方案——组合夹具车削法。
加工精度要求比较高或批量较大的偏心工件类零件的车削加工,均适合采用专用夹具车削法。
在课题的研究设计阶段，首先从众多的零件中选择一个作为设计夹具的零件。
针对该零件的结构特点，制定该零件的加工工艺。
其次要了解夹具的相关知识，结合零件的结构特点选择需要的夹具元件，设计出夹具的大体结构。
机床夹具作为一种重要的工艺装备在机械制造工艺过程中起着十分重要的作用，它的设计不但要保证工件的加工质量，提高加工效率，降低成本，在操作维护中安全方便还要注意到夹具结构的标准化，夹具制造的精密化。
为了保证夹具组装精度，需要学习了解工件定位原理。
根据这些原理结合零件的结构特点确定零件在夹具中以轴外圆作为定位，计算夹具的定位精度与夹紧力保证零件在夹具上的加工精度。
然后使用UG绘图软件参考《夹具设计手册》绘制夹具元件的机械图，完成夹具的设计。
关键词 :偏心轴；车削；夹具AbstractThis topic comes from production practice, make full use of what have learned mechanical drawing, mechanical design and mechanical manufacturing, and other programs, to understand the characteristics for the eccentric shaft, through the UG software, the use of the software mapping function, complete with eccentric shaft parts special combination jig turning design. In this paper , the traditional process methods and the three jaw fine tuning turning method were analyzed , afterthat , a conclusion that the process on eccentric shaft parts are difficulties , low efficiency , poor interchang eability and difficult toguarantee the accuracy can be drawn . Finally , according to the shortcomings of the original process methods , a technology program for process high precision eccentric shaft parts special combination jig turning method is put forwardIn the research projects in the design phase, first select from a number of parts as the design of a fixture parts. For that part of the structural characteristics of the developmentof the parts processing technology. Second, we must understand the fixture knowledge, combined with the structural features of components select the required fixture components, the general structure of fixture design. As an important fixture of the technology and equipment in the mechanical manufacturing process plays an important role, it is designed not only to ensure that the workpiece processing quality, improve processing efficiency, reduce costs, in the operation and maintenance of safe and convenient but also noted that Fixture structure of standardization, the precision of fixture manufacturing .In order to ensure the fixture assembly of precision, need to learn to understand principles of positioning the workpiece. Combination of components based on these principles to determine the structural characteristics of components in the fixture to cylindrical shaft as the positioning of the positioning accuracy of calculation of fixture clamping force to ensure the parts with the fixture on the machining accuracy. And then use the UG drawing software reference, "Fixture Design Handbook," a mechanical fixture elements drawn map, complete fixture design.Keyword: The eccentric shaft; turning; jig1绪论1.1偏心轴车削加工的简介在传动机构中,一般常用偏心工件或曲轴等偏心件来完成回转运动与往复运动相互转换的功能, 因此偏心件在机械传动中应用的十分广泛。