The machining process of box parts generally has multi-station machining requirements for hole system, contour, and plane. It usually goes through milling, boring, drilling, expanding, reaming, tapping, and other processes. There are many tools and tooling used. It needs to be clamped and aligned many times on conventional cnc hmc machine tools, and the measurement times are many. Therefore, the machining cycle is long, the cost is high, and the accuracy is difficult to be guaranteed.