1、 I 题题 目目 F125 曲轴左部零件的机加工艺及铣夹具设计 英文并列题目英文并列题目 F125 crankshaft left parts machining and milling fixture design 摘 要 轴类零件是机器中经常遇到的典型零件之一。它主要用来支承传动零部件，传递 扭矩和承受载荷。轴类零件是旋转体零件，其长度大于直径，一般由同心轴的外圆柱 面、圆锥面、内孔和螺纹及相应的端面所组成。根据结构形状的不同，轴类零件可分 为光轴、阶梯轴、空心轴和曲轴等。 轴的长径比小于 5mm 的称为短轴，大于 20mm 的称为细长轴，大多数轴介于两者之 间。 轴用轴承支承，与轴承配合
2、的轴段称为轴颈。轴颈是轴的装配基准，它们的精度 和表面质量一般要求较高，其技术要求一般根据轴的主要功用和工作条件制定，通常 有以下几项： 轴类零件中工艺规程的制订，直接关系到工件质量、劳动生产率和经济效益。一 零件可以有几种不同的加工方法，但只有某一种较合理，在制订机械加工工艺规程中， 须注意以下几点。 1.零件图工艺分析中，需理解零件结构特点、精度、材质、热处理等技术要求， 且要研究产品装配图，部件装配图及验收标准。 2.粗基准选择：有非加工表面，应选非加工表面作为粗基准。对所有表面都需加 工的铸件轴，根据加工余量最小表面找正。且选择平整光滑表面，让开浇口处。选牢 固可靠表面为粗基准，同时，
3、粗基准不可重复使用。 3.精基准选择：要符合基准重合原则，尽可能选设计基准或装配基准作为定位基 准。符合基准统一原则。尽可能在多数工序中用同一个定位基准。尽可能使定位基准 与测量基准重合。选择精度高、安装稳定可靠表面为精基准。 关键词：？轴类零件、机械加工工艺分析、铣工夹具 II ABSTRACT The axis class components are one which of typical components in the machine meets frequently. It mainly uses for the supporting transmission spare pa
4、rt, the transmission torque and the absorbing load. The axis class components are the solid of revolution components, its length is bigger than the diameter, generally by with spindles outer annulus cylinder, the circular conical surface, in the hole and the thread and the corresponding end surface
5、is composed. According to the structure shapes difference, the axis class components may divide into the optical axis, the steps and ladders axis, the canon and the crank and so on. the axiss length to diameter ratio is smaller than 5mm is called the minor axis, is bigger than 20mm is called the thi
6、n major axis, mostly the number axis is situated between both. the axis with the bearing supporting, is called the journal with the bearing coordinations axis section. The journal is the axis assembly datum, their precision and the surface quality general request are high, its specification acts according to the axis generally the main function and the working condition formulation, usually has the following several items: (1) Size precision P
