The use of twist drills is directly related to the style and type. On the market, 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 drills. The purpose of these drill bits is cutting drilling tools, which can be used as construction concrete drilling, steel plate drilling, electronic industry drilling, etc.
Composition and Processing Effect of Twist Drills
Twist drills are produced according to standard twist drills, which consist of a shank, a neck and a working part. There are 6 angles of drill bits, and different angles have certain differences in drilling accuracy and efficiency. Since the diameter of the twist drill is limited by the hole diameter, and because the spiral groove can make the drill core thinner, the rigidity of the drilled hole is very low, the guidance of the drilled hole is not clear, and the axis of the hole is easily deflected. Therefore, it is difficult to center the chisel edge and the drill bit moves, resulting in large errors in the shape and position of the hole. In addition, because the front and rear curved surfaces of the twist drill bit are the same, and the front and rear angle curves of each point of the cutting edge are different, the cutting conditions are poor and the speed is uneven, which eventually causes the drill bit to wear and the drilling accuracy is low. The last point is that the cutting speed caused by the curve of the drill bit is not uniform, and it is easy to produce spiral debris deposited on the workpiece, and the debris and the hole wall produce extrusion friction. Ultimately, the surface of the ground workpiece is very rough.So can the twist drill drill the cement wall? What can be drilled?
1. Drill metal
Drilling metal is usually a black drill bit, and the drill bit is usually made of high-speed steel. In general metal materials (alloy steel, non-alloy steel, cast iron, cast steel, non-ferrous metals), metalworking drill bits are used together.
However, beware of drilling above metal. The speed should not be too high, it is easy to burn the drill bit. Now there are some golds coated with rare hard metal films on the outside, which are made of tool steel and other materials, which are hardened by heat treatment. The tip is ground at equal angles on both sides and slightly receded to form an acute edge. Steel, iron and aluminum that have not been hardened by heat treatment. Among them, aluminum is easy to stick to the drill bit and needs to be lubricated with soapy water when drilling.
2. Drill the concrete
To drill holes on concrete and stone, use a percussion drill with a masonry drill, and the cutter head is usually made of carbide. Ordinary households use a general 10mm hand drill instead of drilling on the cement wall.
3. Drill wood
Drill holes in the wood with a woodworking drill. The woodworking drill bit has a large cutting volume and does not require high tool hardness. The tool material is generally ordinary high-speed steel. There is a small tip in the center of the drill tip, and the diagonal angles on both sides are relatively large, or even no angle. Used as a fixed position. In fact, metal drills can also drill wood. Because wood heats up easily and the brittle chips are not easy to pull out, you have to slow down and clean up the chips from time to time.
4. Drill tile and glass
Tile drill bits are used to drill holes on ceramic tiles and glass with higher hardness. The tool material is made of tungsten-carbon alloy. Because the tool has high hardness and poor toughness, it needs to be used at low speed and without impact.
Post time: Aug-07-2023