Matters needing attention in manual polishing of injection molds
Pay attention to the following points when polishing with sandpaper:
(1) Polishing with sandpaper requires the use of a soft wood or bamboo stick. When polishing round or spherical surfaces, the use of cork rods can better match the arc of the round and spherical surfaces. Harder bars, like cherry wood, are more suitable for polishing flat surfaces. Trim the ends of the wooden strip to keep it in line with the shape of the surface of the steel. This can prevent the sharp angle of the wooden strip (or bamboo strip) from contacting the surface of the steel and causing deep scratches.
(2) When changing to different types of sandpaper, the polishing direction should be changed from 45 ° to 90 °. The streaks and shadows left after polishing the sandpaper of the previous type can be distinguished.
Before changing the different types of sandpaper, the polishing surface must be carefully wiped with a cleaning solution such as 100% cotton moistened with alcohol, because a small grit left on the surface will destroy the entire polishing process. This cleaning process is also important when changing from sandpaper polishing to diamond polishing. All particles and kerosene must be completely cleaned before polishing continues.
(3) In order to avoid abrasions and burns on the workpiece surface, special care must be taken when polishing with # 1200 and # 1500 sandpaper. It is necessary to load a light load and polish the surface using a two-step polishing method. When polishing with each type of sandpaper, polishing should be performed twice in two different directions, with each rotation between 45 ° and 90 °.