Due to the different selection of cutting tools, the roughness of the machined graphite surface is also different. Workpiece surfaces of some special graphite need to be polished, such as molten graphite crucible. Because the surface roughness of graphite crucible is different, the unpolished graphite crucible will cause some gold melt to cool and stick to the graphite surface. This will cause the loss of gold. Therefore, graphite surface polishing is very necessary.

Different graphite materials have different polishing properties. If the two-impregnation and three-baked graphite material is used to be polished, it can not achieve the effect of mirror. However, if you switch to three-impregnation and four-baked graphite material, it is easy to achieve the mirror effect. Therefore, the choice of graphite materials is also a kind of graphite polishing effect.

In general, we polish graphite on the lathe, which is also called manual polishing. Special equipment and sand belts can also be used for polishing.

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