Graphite carbon is a substance with very sensitive chemical reaction. Its resistivity will change in different environments, that is, its resistance value will change, but one thing will not change. Graphite powder is one of the good non-metallic conductive substances. As long as the graphite powder is kept uninterrupted in the insulated object, it will be energized like a thin wire. However, there is no accurate number of the resistance value, Because the thickness of graphite powder is different, the resistance value of graphite powder will be different in different materials and environments.
Cutting graphite is different from cutting metal. When the tool edge is cut to produce curls or chips, the metal will undergo plastic deformation.
When machining graphite, small powder particles will be separated from the workpiece due to the brittle fracture caused by the stress generated at the edge of the cutting tool.
Cutting graphite consumes less energy and generates less heat than cutting metal.
Graphite is an abrasive material that causes rapid wear of metal uncoated cutting tools. Only diamond or carbide cutters can be used to cut graphite.
Graphite and carbon are usually processed and dried without the use of cutting fluid (coolant). If coolant is used in some machining operations (grinding, honing, polishing), the workpiece should be dried at 300-400 ° f (150-200 ° C) to remove the liquid absorbed by the material.
Compared with metal, graphite is processed at higher cutting speed, feed rate and cutting depth:
1. Material fragmentation (fracture) at the exit of the cutting channel can be avoided by limiting the cutting depth to half the length of the insert;
2. Reducing the feed speed at the outlet of the channel can also prevent fragmentation;
3. The chamfering at the end of the workpiece makes the inlet and outlet of the tool easier and reduces fragmentation;
Processing graphite and carbon produces particles with a size of 0.0004 “- 0.005” (10-130 μ m) Dust within the scope. Dust can be removed from the processing area by providing dust removal equipment with a low wind speed of 6 ft / S (20 m / s).
