How Many Types of Drill Bits Are There?

A drill bit is a rotating tool with cutting ability at the head end. It is generally made of carbon steel SK or high-speed steel SKH2, SKH3 and other materials, milled or rolled and then ground after quenching and heat treatment. It is used for metal or other materials. Drilling processing on top. It has a wide range of uses and can be used on machine tools such as drilling machines, lathes, milling machines, and electric hand drills.

Drill bits can be divided into the following types according to different types:

A. Classification according to structure

1. Integral drill bit: The drill top, drill body and drill handle are integrally made of the same material.

2. End-welded drill bit: The top part of the drill bit is welded by carbide.

B. Classification according to diamonds

1. Straight shank drill bit: Straight shank is used for drill bit diameters below φ 13.0mm.

2. Taper shank drill bit: The drill bit shank is tapered, and the taper is generally Morse taper.

C. Classified by use

1. Center drill bit: Generally used to hit the center point before drilling. The front end taper has 60°, 75°, 90°, etc.

2. Twist drill bit: The most widely used drill bit in industrial manufacturing.

3. Superhard drill bit: The front end of the drill body or all is made of supercarbide cutting material, used for drilling of processed materials.

4. Oil hole drill bit: There are two small holes in the drill body. The cutting agent reaches the cutting edge through the small holes to take away heat and chips. When using this drill bit, the workpiece generally rotates while the drill bit remains stationary.

5. Deep hole drill bit: It was first used for drilling of gun barrels and stone-clad pipes. It is also called gun barrel drill bit. Drill bit specially designed for machining deep holes. In machining, holes with a ratio of hole depth to hole diameter greater than 6 are usually called deep holes. When drilling deep holes, it is difficult to dissipate heat and remove chips, and because the drill pipe is slender and has poor rigidity, it is prone to bending and vibration. Generally, a pressure cooling system is used to solve cooling and chip removal problems.

6. Drill bit reamer: The front end is a drill bit and the rear end is a reamer. The only difference between the diameter of the drill bit and the diameter of the reamer is the amount reserved for reaming. Some drill bits are also used in combination with screw tapping, so they are also called hybrid drill bits.

7. Taper drill bit: Taper drill bit can be used when processing the mold feed port.

8. Cylindrical hole drill bit: We call it a countersunk head milling cutter. The front end of this drill bit has a smaller diameter part called the rod.

9. Conical hole drill bit: used for drilling conical holes. Its front end angle is 90°, 60°, etc. The chamfering tool we use is one of the tapered hole drill bits.

10. Triangular drill bit: A drill bit used in electric drills. The drill handle is made into a triangular surface so that the chuck can securely fix the drill bit.