Abstract: The rear axle shell is one of the important components of a vehicle that is equipped with drive shaft devices such as the transmission system, differential system and wheel section. To solve the problems of low processing efficiency and low processing accuracy of domestic vehicle manufacturers, this article designs a set of process fixtures for the rear axle shell of vehicles. On the premise of meeting the dimensional accuracy, part geometry and positioning accuracy technical requirements, the requirements for batch production and the inspection procedures for use are precisely stipulated to improve production efficiency. Through the design and calculation of the clamping force of the positioning element of the milling machine, it is necessary to meet the clamping force of at least 50 kN when four cutting tools are machined at the sametime. When designing the fixture, a reasonable power source should be adopted for clamping, and a cleaner and greener pneumatic device should be selected to meet the industrialization requirements of low-carbon, green and environmental protection.

Key words: rear axle shell; process fixtures; processing accuracy; drive shaft devices

摘要： 后桥壳是安装了传动系统、差速系统和车轮部分等传动轴装置的车辆重要组成部分之 一。为解决国内汽车生产厂商加工效率低和加工精度低的问题，文章设计了一套汽车后桥壳 体工艺夹具，在满足尺寸精度、零件几何形状和定位精度技术要求的前提下，精确规定批量 生产的要求和使用检验工序以提高生产效率。通过对铣床定位元件夹紧力的设计计算，在 4 把刀具同时加工时需满足至少 50 kN 的夹紧力。在夹具设计时需采用合理的动力源来进行装 夹，选择更为清洁绿色的气压装置，符合低碳绿色环保的工业化要求。

关键词: 后桥壳；工艺夹具；加工精度；传动轴装置