When performing metal polishing, in order to obtain a high-quality polishing effect, it must have high-quality metal polishing materials such as whitestone, sandpaper and abrasive paste, and depends on the surface condition of the polishing tool. So, what should be paid attention to in metal polishing material sandpaper polishing? What problems should be paid attention to when polishing materials with sandpaper?
Polishing materials with sandpaper should pay attention to the following points:
(1) When changing to different types of sandpaper, the polishing direction should be changed by 45°~90°, so that the stripe shadow left after polishing of the previous type of sandpaper can be distinguished. Before changing different types of sandpaper, the polished surface must be carefully wiped with a cleaning liquid such as 100% pure cotton dipped in alcohol, because a small gravel left on the surface will destroy the entire polishing work. This cleaning process is equally important when switching from sandpaper polishing to diamond abrasive paste polishing. All particles and kerosene must be completely cleaned before polishing can proceed.
(b) In order to avoid chafing and burning the surface of the workpiece, special care must be taken when polishing with #1200 and #1500 sandpaper polishing materials. It is therefore necessary to load a light load and to polish the surface using a two-step polishing method. When polishing with each type of sandpaper, it should be polished twice in two different directions, turning 45° to 90° each time between the two directions.
(3) Polishing with sandpaper requires the use of soft wooden or bamboo sticks. When polishing a round or spherical surface, the use of cork rod can better match the curvature of the round surface and the spherical surface. The harder wood strips, like cherry wood, are more suitable for polishing the flat surface. Trim the end of the strip to keep it in line with the surface shape of the steel, which can avoid deep scratches caused by sharp angles of the strip (or bamboo strip) touching the steel surface.
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