Knowledge of prototype model polishing

polishing is an essential step in the processing of the prototype model, because a part is processed by CNC quantity or 3D printing, there will be a lot of knife marks or burrs on the surface of the product. Therefore, it is necessary to use manual polishing to make the surface of the prototype look very smooth.

there are generally several methods of mechanical polishing, dry polishing and wet polishing for prototype model polishing, the following is a detailed introduction to these methods:

(1) Mechanical Polishing: when the area of the polished object is relatively large, in order to improve work efficiency, mechanical polishing methods, such as electric grinding machine or disc type and vibrating grinding machine, can be used.

(2)Dry polishing: sandpaper is used for polishing. It is suitable for the polishing of hard and brittle lacquer. Its disadvantage is that a lot of dust will be generated during the operation, affecting environmental sanitation.

(3) Wet sanding: Polish with water sandpaper or soapy water. The water mill can reduce the grinding marks, improve the smoothness of the coating, and save the effort of sandpaper. However, when spraying the lower paint after water grinding, one should wait for the water grinding layer to be completely dried before the lower paint can be applied, otherwise the paint layer will easily be white; In addition, the base material with strong water absorption is not suitable for water grinding.

The main role of prototype polishing there are three: first, remove the excess edges and burrs on the surface; The second is to reduce the smoothness of the surface of the workpiece; The third is to increase the adhesion of surface paint.

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