装载机桥、箱用输入（出）法兰的结构基本上大同小异，如图１所示。设计中外圆、止口对渐开线内花键分度圆的同轴度要求较高，工艺难度较大，原因在于：内花键分度圆公差范围大，工装难以准确定位；工艺流程中精车、磨削、抛光均用芯轴且各自均有差异，不同芯轴间很难保证形位 Loader bridge, box with input (out) the structure of the flange is basically the same, as shown in Figure 1. Design of the outer circle, only the involute involute spline indexing round coaxial requirements are higher, the process more difficult, because: a large tolerance range of the inner spline sub-degree, the tool is difficult to accurately locate; process Fine car, grinding, polishing are used with the mandrel and their differences are difficult to ensure that the mandrel between different positions