PDC bit is composed of bit body, PDC cutting teeth and nozzle. It is divided into two series: steel body and matrix according to different structure and manufacturing process.

The whole bit body of rigid PDC bit is made of medium carbon steel and machined by mechanical manufacturing process. Drill holes on the working face of the drill bit and fix the PDC cutting teeth on the crown of the drill bit in a press fit manner. The crown of the drill bit is treated by surface hardening process (spraying tungsten carbide wear-resistant layer, carburizing, etc.) to enhance its erosion resistance. The main advantage of this kind of bit is that the manufacturing process is simple; The disadvantage is that the bit body is not resistant to erosion, and the cutting teeth are difficult to fix, so it is rarely used at present.

The upper part of the matrix PDC bit body is steel body and the lower part is tungsten carbide wear-resistant alloy matrix, which is manufactured by powder metallurgy sintering process. Use low-temperature solder to weld PDC cutting teeth on the reserved groove of the matrix. Tungsten carbide matrix has high hardness and erosion resistance, so the matrix PDC bit has long service life and high footage. At present, it is widely used.

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