Carbide drill bits are divided into four basic types: solid carbide drills, carbide indexable insert drills, welded carbide drills and replaceable carbide crown drills. Each drill has the benefit of a specific processing premise.

(1) Solid carbide drill bit

(2) Carbide indexable insert drill bit

The drill bit with the carbide indexable insert can be machined with a wide range of machining depths from 2D to 5D (D is the bore diameter) for lathes and other torsion machines.

(3) Welded carbide drill bits

The welded carbide drill is made by smoothly welding a hard alloy crown on a steel drill body. The drill adopts a self-centering geometric blade type, and the cutting force is small. The workpiece material can achieve excellent chip control, and the processed hole has a good surface finish, high dimensional accuracy and positioning accuracy. Subsequent finishing. The drill is an internal cooling system that can be used in machining centers, CNC lathes or other high-rigidity, high-speed machines.

(4) can change the carbide crown bit

The changeable carbide crown can be a new generation of drilling tools. It is made up of a steel drill body and a replaceable solid carbide crown. Compared with a welded carbide drill, the machining accuracy is 182 kg, but the crown can be changed to reduce the machining cost. Improve the yield of drilling. This drill bit achieves accurate hole size increments and has a self-centering function, which is highly accurate in aperture machining.

The interlocking V-groove abutting mechanism between the drill body and the cemented carbide crown is locked with each other to ensure that the bit assembly has the same dimensional accuracy and overall rigidity as the welded carbide drill. At the same time, the locking mechanism has only a unique matching position, so that the crown can be easily mounted on the matching tie rod, thereby ensuring the repositioning accuracy when changing the crown. When the drawbar is tightened via the locking screw, the crown/drill combination is smoothly locked to each other with a contiguous stiffness sufficient for the rushing, high speed cross-product hole machining requirements. Seco-Carboloy's carbide crowns made with advanced injection molding technology have a very high material averaging, giving the crown an average strength and uniform thermal deformation. Seco currently offers CrownLoc drills with three specific geometry types: the first is a universal geometry with conventional edge passivation radius, land width and reverse cone angle, suitable for machining large models. Steel material; the second is a geometric edge with a wide land and chamfer, suitable for processing cast iron materials; the third geometric edge can cut cutting heat and work hardening, suitable for processing stainless steel and super alloy materials.

When considering the processing cost per hole, the total life of the drill bit should also be counted. In general, a solid carbide drill can only be reground 7 to 10 times, a welded carbide drill can only be reground 3 to 4 times, and the carbide crown can be changed to process steel. At the time, the steel drill body can change the crown at least 20 to 30 times.