Drill bits are relatively common in our daily life, but many people may not know the size of the drill bit. 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 after milling or rolling and then quenching, tempering and heat treatment. It can be used in drilling machines, lathes, milling machines, electric drills and other machine tools. For this kind of product, it is still difficult to understand if it is not an insider. Especially the size of the drill bit is not known. Therefore, in response to such problems, we will come to understand the size specifications of drill bits and the classification of drill bits, hoping to help friends who have needs in this regard!
Type of drill
A. 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 made of carbide welding.
B. Classification by drill
(1). Straight shank bit: The diameter of the drill bit is less than ψ13.0mm, all with straight shank.
(2). Taper shank bit: The bit shank is tapered. Generally, the taper is Mohs taper.
C. Classification by use
(1) Center drill: generally used for drilling the center point before drilling, the front cone surface is 60 °, 75 °, 90 °, etc. In order to use the tailstock support during lathe operation, 60 ° center drill and lathe should be used The tailstock top center matches 60 °.
(2) Twist drill bit: It is the most widely used drill bit in industrial manufacturing. Twist drill bits are generally used.
(3) Super hard drill bit: The front end or all of the drill body is made of super hard alloy cutting tool material, which is 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 part through this small hole to take away heat and swarf. Using this drill bit, the general work object rotates, while the drill bit is still.
(5). Deep-hole drill bit: It is the earliest used for drilling of gun barrel and stone-clad tube, also known as gun drill bit. The deep-hole drill is of a straight groove type, and a quarter of the strong part is cut in a round tube to produce cutting edge cutting.
(6) Drill bit reamer: For the purpose of mass production, the front end is the drill bit, and the rear end is the reamer.The diameter of the drill bit and the reamer diameter are only the margin of the reaming hole, and there are also drill bits mixed for screw tapping, so Also known as a hybrid drill.
(7). Taper bit: When processing the mold feed port, a taper bit can be used.
(8). Cylindrical hole drill: We call it a countersink milling cutter. The front end of this kind of drill has a part with a small diameter called a rail.
(9). Conical hole drill: For drilling conical holes, the angle of the front end is 90 °, 60 ° and so on. The chamfering knife we ​​use is a kind of conical hole drill.
(10). Triangular drill bit: A drill bit used for electric drills, the drill shank is formed into a triangular surface, so that the chuck can reliably fix the drill bit.
Drill size specifications
1. The greater the ratio of the length of the drill bit to the diameter, the bending tendency of the drill bit then increases. In this way, the length-diameter ratio can be reduced, and the deflection force can be reduced, thereby avoiding the breakage of the drill bit and the increase of the hole diameter error. Drilling deeper holes requires a larger aspect ratio of the drill specifications. Generally, the depth of a hole exceeding 3 times the diameter is a "deep hole", and the depth of a micro-drilled hole generally exceeds this limit.
2. If a drill with a diameter of 3.175mm processes a hole with a depth of 31.75mm, the long diameter should reach a ratio of 10: 1; while a drill with a diameter of 0.508mm processes a hole with a depth of 25.4mm, and the length to diameter ratio reaches 50: 1. Therefore, as the diameter of the drill bit decreases and the brittleness increases, then it becomes a source of many problems when deflecting. To control the brittleness of the drill bit, it is necessary to balance the hardness and toughness of the tool base.
Straight shank countersink bit diameter specification table:
Specifications Small diameter Large diameter Full length Small diameter Blade Long shank diameter
M3 3.4 6.5 65 13 6.5
M4 4.5 8.0 75 18 8
M5 5.5 9.5 85 22 9.5
M6 6.6 11.0 90 25 11
M8 9.0 14.0 100 28 12
M10 11.0 17.5 110 30 12
M12 14.0 20.0 115 32 12
Bit usage and classification
1. Center drill bit: Generally this type of drill bit is used to drill the center point before drilling. The front cone is 60 °, 75 °, 90 °, etc. In order to use the tailstock support when lathe work, 60 should be used. ° The center drill matches the top of the lathe tailstock 60 °.
2. Twist bit: This bit is most widely used in industrial manufacturing.
3. Super hard drill bit: Because the front end or all of the drill body is made of super hard alloy cutting tool material, it is generally used for drilling of processed materials.
4. Oil hole drill bit: This drill body has two small holes. The cutting agent reaches the cutting edge part through this small hole to take away heat and swarf. Using this drill bit, the general work object rotates, and the drill bit is still.
5. Deep-hole drill bit: This drill bit was first used for drilling of barrel and stone-clad tube, also known as barrel drill. The deep-hole drill is of a straight groove type, and a quarter of the strong part is cut in a round tube to produce cutting edge cutting.
Editor's summary: The above is the relevant introduction of the standard drill bit size. What are the pictures of drill bit appreciation, I hope to help friends who have needs in this regard! For more related information, please continue to follow our website, and more exciting content will be presented in the future. You can also go to Qijia Mall to buy more products you like!
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