Now in the forging process experiment and simulation calculation of hook die forgings, we have learned the change of metallurgical defects and stress field of die forgings. Through experiments, it has been proved that the correct design of forging die and the selection of appropriate blank size can effectively prevent other metallurgical defects in die forgings. Computer simulation has learned the reliable means to accurately predict and explain the change of internal defects in the forging process, taking the Boeing landing gear joint as an example, The main methods of controlling the shape, dimension and tolerance of matrix forging are described.

It is the size control of the final floor slab, which is controlled by the geometric tolerance of the die forging template, including misalignment and straightness. The accuracy of the guide column and guide wall ensures the effect. It is controlled by heating treatment by forging the mold and straightening it after cooling. The aluminum alloy piston forging is the foundation of the marine internal combustion engine piston. For the metal with large machining capacity and low utilization rate, The problem of high precision forging cost has been solved.