What Are the Types and Specifications of Twist Drills?

A drill is a rotary tool with cutting ability at the head end

Twist Drill Bit Manufacturing process:

Generally, carbon steel SK, or high-speed steel SKH2, SKH3 and other materials are milled or rolled and then quenched, tempered, and then ground

Production use:

It is widely used in the drilling of metal or other materials, so It can be used on drilling machines, lathes, milling machines, hand drills, and other machine tools

We can Distinguish Them by Three Categories

Twist Drill Bit Classification by Structure

1. Integral drill bit: The drill head, drill body, and drill shank are made of the same material
2. End-welded drill bit: the top of the drill is welded by carbide

Twist Drill Bit Classification by Drill Collar

1. Straight shank drill bit: The drill bit diameter is less than ψ13.0mm, all use straight shank
2. Taper shank drill bit: The shank of the drill bit is tapered, and its taper generally adopts Morse taper

Twist Drill Bit Classification By Use

1. Center drill: Generally used for drilling the center point before drilling. The front end taper has 60 °, 75 °, 90 °, etc
2. Twist drill: It is the most widely used drill in industrial manufacturing. We generally use twist drills
3. Super hard drill bit: Super hard drill bit: The front end of the drill body or all of it is made of super hard alloy tool material, which is used for drilling of processing materials.
4. There are two small holes in the drill body. The cutting agent passes through this small hole to reach the cutting edge to remove heat and chips. Using this drill, the general work object rotates, and the drill is stationary
5. Oil hole drill: It is the earliest used for drilling of the gun barrel and stone-wrapped tube, also known as barrel drill
6. Drill reamer: For mass production, the front end is a drill bit and the rear end is a reamer
7. Taper bit: When processing the mold inlet, a taper bit can be used
8. Cylindrical hole drill: We call it a countersink milling cutter, and a small diameter part at the front of this drill is called a track rod
9. Conical hole drill: For drilling conical holes, the front end angle is 90 °, 60 °, etc. The chamfering knife we ​​use is a type of conical drill
10. Triangular drill: A drill used in electric drills, whose drill shank is made into a triangular surface, so that the chuck can securely fix the drill