T
he use of twist drills is directly related to the 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, special-length twist drills, etc. on the market. The purpose of these drill bits is cutting drilling tools, which can be used for construction concrete drilling, steel plate drilling, electronic industry drilling, etc.
Twist drill composition and processing effects
Twist drills are produced based on standard twist drills, which consist of a shank, neck and working part. There are 6 types of drill bits with different angles. Different angles have certain differences in drilling accuracy and efficiency. Since the diameter of the twist drill is limited by the hole diameter, and since the spiral groove can make the drill core thinner, the rigidity of the drill hole is very low, the guide of the drill hole is unclear, and the axis of the hole is easily deflected. Therefore, it is difficult to center the chisel edge and the drill bit moves. The result is a large error 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, the speed is uneven, and ultimately the drill bit wears out and the drilling accuracy is low. The last point is that the drill bit curve causes uneven cutting speed, which easily produces spiral debris deposited on the workpiece, and causes extrusion friction between the debris and the hole wall. Ultimately, the surface of the ground workpiece is very rough
Can a twist drill drill through cement walls? What can be drilled?
1. drill metal
Drilling metal is usually a black drill bit. 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, be careful about drilling holes in metal materials. The rotation speed should not be too high, as it may easily burn the drill bit. Nowadays, some are coated with a rare hard metal film and are made of gold, such as tool steel, which has been hardened by heat treatment. The tip is ground to equal angles on both sides and slightly tilted back to form a sharp-angled blade. Steel, iron and aluminum that have not been hardened by heat treatment. Aluminum easily sticks to the drill bit and needs to be lubricated with soapy water when drilling.
2. drilling concrete
To drill holes in concrete materials and stone, use an impact drill with a masonry drill bit. The cutter head usually uses carbide.
Ordinary households use an ordinary 10mm electric hand drill instead of drilling holes in cement walls.
3. drill wood
Use a carpenter's drill to drill holes into the wood. Woodworking drill bits have large cutting capacity and do not require high tool hardness. The tool material is generally 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 non-angular. Used as a fixed position. In fact, metal drills can also drill through wood. Because wood heats easily and brittle wood chips are difficult to extract, you must slow down and clean the wood chips from time to time.
4. Drill tiles and glass
Use tile drill bits to drill holes in ceramic tiles and glass with higher hardness. The tool material is tungsten carbon alloy. Because the tool has high hardness and poor toughness, you need to pay attention to low speed and no impact use.