机械5

拖拉机半轴壳铣床夹具设计 摘要 机床夹具是在金属切削加工中,用以准确地确定工件位置,并将其牢固地夹紧,以接受加工的工艺设备.本着夹得快,夹得牢,夹得准的设计原则和在经济,高效的市场观念指导下进行本次设计。汽车半轴壳是汽车的重要部件之一。它既要承受车体和车载的全部质量，还要承受汽车在行驶过程中由于道路不平而引起的冲击力和扭矩，并要保证在行驶过程中不发生变形，而半轴在其内旋转自如。由拖拉机半轴壳零件图可知零件的基本结构和加工要求。该工件铸成后要达到图纸所示的加工要求要分三阶段完成，第一阶段需车削四个端面和两个外圆；车削后第二阶段铣削三个端面，其中两个是为了钻孔而做的前期工作，而有10度倾角要求的端面是零件结构的要求。完成前两阶段加工后再对两个端面钻通孔，各端面孔的位置要求为均布。据些分析设计铣床夹具。 关键词：铣削夹具工件定位精度 Tractor rear axle shaft housi
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ng accuracy 目录 1绪论1 1.1前言1 1.2课题总体任务概述1 2工件的加工工艺分析4 3.夹具的结构设计5 3.1定位方案选择及定位元件设计5 3.2定位误差分析7 3.3夹具对定方案的确定8 4.绘制夹具总图(见图纸) 9 4.1铣削力的计算9 4.1.1圆盘铣刀…………………………………………………………………………….9 4.1.2粗齿锥柄立铣刀…………………………………………………………………...10 4.2夹紧力的计算10 5.确定夹具的主要尺寸,公差及技术要求12 5.1夹具总图上应标尺寸,公差12 5.2夹具总图应标注的技术条件12 6.总结13 7.参考文献14 8．致谢15