Cemented carbide drills are divided into four basic types: solid cemented carbide drills, cemented carbide indexable insert drills, welded cemented carbide drills and replaceable cemented carbide crown drills. Each drill bit has benefits that are suitable for specific processing conditions.

(1) Solid cemented carbide drills

(2) Carbide indexable insert drill bit

Drills with cemented carbide indexable inserts can process a wide range of apertures, and the processing depth ranges from 2D to 5D (D is the aperture), which can be applied to lathes and other torsion processing machine tools.

(3) Welded carbide drill

The welded hard alloy drill bit is made by smoothly welding a hard alloy tooth crown on the steel drill body. This kind of drill bit adopts self-centering geometric edge type with low cutting force. It can achieve excellent chip control for most workpiece materials. The processed hole has good surface finish, high dimensional accuracy and positioning accuracy. Perform subsequent finishing. The drill adopts an internal cooling system, which can be used in machining centers, CNC lathes or other high-rigidity, high-speed machine tools.

(4) Cemented carbide crown bits can be changed

The replaceable carbide crown bit is a new generation of drilling tools. It is composed of a steel drill body and a replaceable solid carbide crown. Compared with welded carbide drills, its machining accuracy is eight and a half catties, but because the crown can be changed, it can reduce the processing cost. , Improve drilling yield. This kind of drill can obtain accurate aperture size increment and has a self-centering function, so the aperture processing accuracy is very high.

The drill body and the cemented carbide crown are locked with each other by a well-ground interlocking V-shaped groove adjoining mechanism, which can ensure that the drill bit assembly has the same dimensional accuracy and overall rigidity as the welded cemented carbide drill. At the same time, this kind of locking mechanism has only a unique exact matching position, which makes it easy to install the tooth crown on the matching rod, thereby ensuring the repeated positioning accuracy when changing the tooth crown. When the tie rod is tightened by the locking screw, the crown/drill body combination is smoothly locked to each other, and its adjoining rigidity is sufficient to meet the requirements of high-speed, high-speed cross-productivity hole processing.