Do not use the finest whetstone, sandpaper, and polishing paste for mold polishing at the beginning, as it will not throw away the coarse texture. The surface polished like that looks very bright, but when it is shot from the side, the rough lines are revealed. Therefore, it is necessary to first polish from a coarse whetstone, sandpaper or grinding and polishing paste, and then replace it with a finer whetstone, sandpaper or grinding and polishing paste, and finally polish it with the finest grinding and polishing paste. This seems to be more troublesome and has many processes. In fact, it is not slow. One process after another, the rough processing lines in the front are polished off, and then the following process is carried out, without rework, and the finish of the mold can meet the requirements after one step.
Generally, use a coarse oilstone to roughen the surface of the machined mold cavity, and then use a fine oilstone to polish off the rough oilstone to achieve traces, and then use a fine sandpaper to polish the fine oilstone. The polished surface is polished again, and finally the cavity surface of the mold is polished with polishing paste or abrasive paste to achieve a bright mirror-like effect. This is the general process of polishing the mold. Of course, if possible, you can use an ultrasonic polisher to polish the mold, which is more efficient. People are also more economical.
