Firstly, rotate the copper figure 180 degrees in the front or side view to create the front mold figure, and of course, add the pillow position and PL surface; Do not use the mirror body method to change the copper work diagram into the front mold diagram where the original body needs to be left, as it may be incorrect (when the copper work diagram is asymmetric in both the X and Y directions). There are two difficulties in front mold processing: the material is relatively hard; The front mold cannot be easily welded and cannot be mistaken. When opening the front mold, the principle of using a knife is similar to that of a copper worker. The big knife should be used for rough cutting → the small knife should be used for rough cutting → the big knife should be used for smooth cutting → the small knife should be used for smooth cutting. However, the front mold should try to use a big knife instead of a too small knife, as it is easy to bounce the knife. When opening the thick mold, the knife handle () is usually used first. When using a smooth knife, a round nose knife should also be used as much as possible. As this type of knife is large and powerful, there is usually a problem when processing the front mold with a parting surface. When using a smooth knife, the parting surface needs to be accurately aligned due to the, And a machining allowance of 0.2~0.5 should be left for the cavity (leaving it for sparking). This allows for a positive correction of 0.2~0.5 on the surface of the mold cavity, and setting the machining allowance to 0 when writing the tool path. When cutting a rough or smooth front mold, it is usually necessary to limit the cutting range. Remember that the range you set is the range of the tool center, not the range of the tool boundary, not the range processed by the tool, but a larger tool radius. The commonly used cutting method for front mold roughening is curved surface grooving and parallel light cutting. When processing the front mold, the profile surface and pillow position surface should generally be machined to the standard number, while the collision surface can leave a margin of 0.1 for mold preparation.