Machining process of front overhang combined cast of truck

The invention provides a machining process of a front overhang combined cast of a truck. The machining process is reasonable in arrangement and has high processing efficiency. The technical scheme of the invention is as follows: according to the machining process of the front overhang combined cast of the truck, the front overhang combined cast is installed on a vertical beam of a frame of the truck; and the machining process comprises the steps of: (1) milling each surface, a left internal surface and a downward internal surface of a boss and drilling each surface of the boss and chamfering and tapping; (2) after overturning a workpiece, milling each surface of the boss off, finish-milling a reference surface A, an internal surface on the end surface of a fixed hole of a bent beam, an end surface of a pin shaft hole of a milling spring and two inside vertical surfaces; and (3) machining surfaces around and holes on the surfaces around and chamfering and tapping. The machining processdisclosed by the invention has the beneficial effect that with adoption of the technical process, the steps are arranged reasonably, and the positioning clamping is reasonable to arrange so as to position and clamp the workpiece conveniently, thereby the precision requirement of the workpiece can be ensured with high machining efficiency.