Due to the continuous improvement of market demand, the capacity of the diesel engine production line has been continuously filled and filled, from an annual output of 24,000 units, to 38,000 units, to 70,000 units, although large-scale technical transformations have taken place. However, most of the newly added equipments are drill-and-boring machine tools. Due to the limitation of the production line and space, the milling equipment of the production line cannot be added. The efficiency and capability of the milling equipment can not meet the market demand and become a key bottleneck process. It is imperative to transform existing milling equipment, apply new processes and new technologies, and improve the milling efficiency of the production line.