摘要：汽车发动机的转向节零件主要功能是为了使汽车能够灵活转向。为了使汽车在灵活转向的同时又能平稳行驶，它必须承受住来自汽车前端的载荷，有一定的强度要求。本论文的旨在使汽车发动机的转向节零件在达到一定的可靠性和耐久性的同时，也降低生产成本。70602

本次设计的加工工艺流程主要是针对零件的节轴表面、端面、主销孔及键槽的表面粗糙度、位置度、尺寸精度等要求进行设计。因为毛坯的成本和质量是生产质量优质、价格便宜转向节零件成品的重要因素之一，所以本次加工工艺设计将毛坯制造也考虑进去。毛坯采用模锻加工，利用冷锻进行大批量制造，所得毛坯尺寸精度高，表面粗糙度好，劳动条件好。

为了方便加工，本套加工工艺流程将转向节零件分成3组加工表面，分别是：节轴部分、主销孔部分以及键槽部分。使用拉削的加工方法作为主销孔的精加工，以此来提高表面精度。所选用的加工设备均为组合机床，以此达到减少工序数目的目的，减少工件的安装次数也大大提高了生产效率。

本次设计的最后部分是针对两个工序的夹具设计，分别是是拉削两个主销孔的夹具和法兰盘上孔加工的夹具。充分利用所学知识，结合CAD绘图软件进行设计，为了保证夹具的组装精度，参考了现代工厂加工转向节时的特制夹具，结合课本所述的工件定位原理完成本次设计。

毕业论文关键词:转向节；加工设计；夹具设计

The processing technology and clamping device design of the steering knuckle

Abstracts：The steering knuckle is an important automobile part of the steering axle, as it enables the automobile to steadily steer and agilely transfer steering directions. The function of the steering knuckle is transferring and supporting the front-end load as well as supporting and driving the wheels to move around the master pin and thus making the automobile veer. When the automobile is running, the steering knuckle carries fickle impact loads. Therefore, a high intensity is required.

In this paper, the main research object is the processing technique designed in accordance with the technological requirements of the surface and end-face of the steering knuckle, the master pin and the key groove. The processing is separated into two phases: workblank processing and automobile parts processing. The workblank is processed by die forging and mass manufactured by cold forging. Thus, the final workblank has high-precision size, good surface roughness and sound labor conditions.

The processing of the automobile parts in this design includes rough machining, semi-finishing and finishing. Highly-productive special equipment and technological equipment can be used in production as all working procedures are relatively concentrated, which can enormously increase productivity and relatively decrease the working procedures. Therefore, it can not only save time but also guarantee the relative position precision of the surface of automobile parts as the number of surfaces in need of installation and processing has increased.

The final part of this design is two working procedures’ design of the clamp -- clamps of two master pinholes and the clamp of the steering axle. The design was made by virtue of available knowledge and CAD software. To ensure the precision of the clamps, the specially-made clamps produced by modern factories in knuckles processing was taken as a reference in combination of the basic principles of workpiec localization from the textbook in this design.

Keyword: steering knuckle；processing  ；clamp 

目录

一、绪论 2

1.课题背景及意义 2

2.课题关键问题及难点[2]