The purpose of the twist drill is directly related to its style and type. There are cobalt-containing stainless steel twist drills, parabolic deep hole twist drills, gold-containing twist drills, titanium-plated twist drills, high-speed steel twist drills, and extra long twist Drill bits and so on. Among them, the purpose of these drill bits is used to cut drilling tools, which can be used for building concrete drilling, steel plate drilling, electronic industry drilling and so on.
Twist drill bit composition and processing influence
Twist drills are manufactured according to standard twist drills, which are composed of the shank and neck and the working part. There are six kinds of twist drill angles, and different angles have certain differences in the accuracy and efficiency of drilling. Since the diameter of the twist drill is limited by the hole diameter, the spiral groove can make the drill core thinner, so that the rigidity of the drill bit is very low, and then the direction of the drill bit is not clear, the axis of the hole is easy to cause deflection, so that It is difficult to center the cutting edge, so that the drill bit moves, and the result is a large error in the shape and position of the hole. In addition, because the front and back surfaces of the twist drill are consistent, and the rake angle and the rake angle of each point of the cutting edge are different curves, this leads to poor cutting conditions, uneven speed, and ultimately makes the drill wear, so drilling The precision is low. The last point is that the curve of the drill bit leads to uneven cutting speed, and it is easy to form helical debris accumulated on the workpiece. The debris then squeezes and rubs against the hole wall. The surface of the final processed workpiece is very rough.
Can a twist drill bit drill a concrete wall? What can a drill bit drill?
1. Drill metal
The drill metal is generally a black drill bit. The material of the drill bit is generally high-speed steel. Drill holes on general metal materials (alloy steel, non-alloy steel, cast iron, cast steel, non-ferrous metals), and use metalworking drill bits.
However, pay attention to drilling holes in metal materials, the speed should not be too high, it is easy to burn the edge of the drill bit. There are some gold plates coated with rare hard metal films on the outside, which are made of tool steel and the like, which are hardened by heat treatment. The tip is grinded to equal angles on both sides and slightly inclined backward to form an acute-angled blade. The drill does not have steel, iron, and aluminum that are hardened by heat treatment. Aluminum is easy to stick to the drill bit, and it needs to be lubricated with soapy water when drilling.
2. Drilling concrete
Drill holes in concrete materials and stone materials, use impact drills, combined with masonry drill bits, and the material of the cutter head is generally cemented carbide.
Ordinary households, instead of drilling holes on cement walls, use ordinary 10mm hand drills.
3. Drilling wood
Drilling holes in wood materials, with the use of woodworking drills, woodworking drills have a large sales volume, and the tool hardness is not high. The tool material is generally high-speed steel. There is a small point in the center of the tip of the drill bit, and the equal angle on both sides is relatively large, even there is no angle. Used for a good fixed position. Its practical metal drilling bit can also drill wood. Because wood is easy to heat and brittle chips are not easy to come out, you must slow down the speed and often withdraw to remove brittle chips.
4. Drilling tiles and glass
When drilling ceramic tiles and glass with higher hardness, tile drill bits are used. The tool material is tungsten-carbon alloy. Because the tool has high hardness and poor toughness, it needs to be used at low speed and without impact.