Oct 26, 2017
HSS Drill Bits durable
Carbide drill bit of the advantages and disadvantages: carbide drill bit can drill hard to drill the information, the defect is to get well, grinding is easy to chime, the two main cutting edge, the same point of view, the best to use Grinding machine.
Some forum users say hard alloy drill bit diameter greater than 6mm carbide drill bits are made in tiled structure, but the practice also has a diameter of 25.5 tiles carbide drill. That kind of argument is faulty, the carbide drill bit is divided into two kinds of solid carbide drill bits and inlaid drill bits, not scale. The former offer higher, suitable for higher demand or high-volume production of goods; the latter offer a relatively low, the right demand is not high, non-high-volume production of the occasion.
Carbide bit and cobalt high-speed steel drill which is good? What is the difference between these two raw materials? The two kinds of raw materials, the bit is not good or bad, the key is to see the application !! Carbide drill, high hardness, wear Loss, high efficiency, less tolerant, so the rigidity of the machine and the spindle beating and speed are required! Cobalt high-speed steel contains high-speed steel, the resistance is better, the edge can be handled very sharp, more suitable processing some more sticky Of the data, of course, the lower the strength of the information even more indecent, but its high temperature, wear resistance is relatively poor, the drill speed is not high! So the selection of the drill is still based on your work Situation to pick. The drill bit is a widely used hardware for our engineering machinery. It is used to drill holes or blind holes in solid materials and to drill holes in existing holes. But different operating environment we choose the different types of drill bits, commonly used drill bit are twist drill, countersink drill, center drill, deep hole drilling and hollow drill. Drilling and countersinks can not drill holes on solid materials, but they are also routinely classified as drills.
Twist drill is the most widely used hole machining tool. Usually in the range of 0.25 to 80 mm in diameter. It consists mainly of working parts and handles. The working part has two spiral grooves, shaped like twist, hence the name. Standard twist drill part of the cutting angle of 118, horizontal blade angle of 40 ° ~ 60 °, the rear angle of 8 ° ~ 20 °. Twist drill handle in the form of a straight handle and taper shank two kinds of processing when the former folder in the drill chuck, the latter inserted in the machine tool spindle or tail of the cone hole; general twist drill with high-speed steel manufacturing.
Deep hole drilling is usually refers to the processing hole depth and aperture ratio of more than 6 holes of the tool. Commonly used gun drill, BTA deep hole drilling, jet drilling, DF deep hole drilling and so on.
Drilling holes are 3 to 4 teeth, the rigidity than the twist drill, used to expand the existing holes and improve the processing accuracy and finish.
Countersunk drill has more teeth, the forming method to the end of the hole into the required shape for the processing of a variety of countersunk head screw head hole, or flatten the hole outside the face.
Center drill for the drilling shaft of the workpiece center hole, which is essentially a small spiral angle twist drill and countersink drill compound, it is also known as composite center drill.
Hollow drill pipe in the middle of a hollow drill bit, mainly used for drilling core.