Introduction to the Classification of Drill Tools

Dec 5, 2022

The drill bit is a tool that rotates and has 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. Drills are used for drilling holes in metal or other materials.

It has a wide range of applications and can be used on machine tools such as drilling machines, lathes, milling machines, and electric drills.

According to different types, drill bits can be divided into the following categories:

A. Classification by structure 1. Integral drill bit: the drill top, drill body and drill shank are integrally manufactured from the same material. 2. End-welded drill bit: The top part of the drill bit is welded by carbide.

B. Classification according to the drill shank 1. Straight shank drills: Drills with a diameter below φ 13.0mm all adopt straight shanks. 2. Taper shank drill bit: The drill bit shank is tapered, and generally its taper adopts Morse taper.

C. Classification by use

1. Center drill bit: generally used for drilling the center point before drilling, the front taper surface 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 of it is made of superhard alloy cutting tool material, which is used for drilling of processing 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 work object rotates and the drill bit is stationary.

5. Deep hole drill bit: It was first used for the drilling of gun barrels and stone guarantees, also known as gun barrel drill bits. The deep hole drill bit is a straight flute type, and a quarter-strong part is cut off in the round tube to produce cutting edge chip removal.

6. Drill bit reamer: the front end is a drill bit, and the rear end is a reamer. The diameter of the drill bit and the diameter of the reamer are only different from the allowance for reaming. There are also drill bits 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 inlet.

8. Cylindrical hole drill: We call it a countersunk milling cutter, and the part with a smaller diameter at the front end of this drill is called a rod.

9. Conical hole drill bit: for drilling conical holes, the front end angles are 90°, 60°, etc. The chamfering cutter we use is one of the conical hole drills.

10. Triangular drill bit: A drill bit used by an electric drill. The drill shank is made into a triangular surface so that the chuck can securely fix the drill bit.

<< Classification of Shank Types for Annular Cutters

>> Introduction to Magnetic Drilling Machines

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