Variety of drill bit:

       A drill with a carcass and a steel body. The first is the tungsten powder which is sintered and left with a groove at the time of firing, and then the composite piece is welded on it. However, when the second is used, a piece of alloy steel is machined mechanically, so that the compound is welded on the tungsten carbide tooth column to form a cutting tooth, and then it is mounted on the bit body. The diamond or some other wearable material is embedded on the bit body in the diameter protection area, and we can also spray a layer of wear-resistant material on its working surface, which can prevent erosion.

       The geometry of the working face of a drill bit. The shape of the PDC working face can hinder its bottom hole cleaning and the load distribution of each part.