The process of making carbide inserts

A carbide insert is a bit with multiple cutting edges and is useful because it can be replaced once the edges are worn. The process for manufacturing inserts varies somewhat between companies.

1. Tungsten

Carbides are carbon compounds noted for their heat resistance and durability. Tungsten carbide is the variety typically used for tools; this carbide uses another metal, usually cobalt, to cement the carbide powder together to create a usable substance.

2. Molds

Carbide is pressed into a mold to create the basic shape. It is ground at later points in the process to refine this shape and create an edge.

3. Coating

Carbide inserts are often coated with another substance during the manufacturing process to increase the lifespan of the insert. Such coatings are added by chemical vapor deposition (CVD), which involves using ionized gases to cause a chemical reaction on the surface of the insert, binding the coating.

4. Variation

Specifics of the manufacturing process vary between companies, as there are many options with the ratios of chemicals, design of the insert and coatings.