Many times, I will encounter some large aluminum alloys. If the aluminum alloy is low in hardness, it will be easily deformed after processing. If some large Aluminum alloy casing parts are encountered, in order to prevent it from deforming, it is necessary to prevent deformation before opening and roughing. The outline structure is roughly opened, and then the front and back surfaces are flattened to make it vertical and then the machine is used to make the front and back sides of the light knife. If the side wall of the workpiece is very thin, it must be heat-hardened before the machine is placed. It can also be left in the thickness according to the structure of the workpiece. Then the verticality of the parallelism of the workpiece is straightened and the entire plane of the workpiece is brushed. It is also possible to solve the problem of workpiece deformation.