Alloy Drill Bits
The alloy bit is generally refers to the cemented carbide bit, the integral type, the welding type, the indexable blade type and the exchangeable head. The main components of cemented carbide are tungsten carbide, cobalt and other, high hardness is generally more than HRC90 degree, in the batch processing and hard processing of the occasion is more applicable.Drill Bits
Now on the market, the alloy bit is generally tungsten steel quality of the whole bit, although the same material, but due to the reasons for processing technology, the different brands of product quality difference. The imported and homemade alloy drill bits vary widely. The imported alloy bits are generally used in VHM micro-grain hard alloy (ISO K40), and the Ultrafine particle type (0.6µm) is ideally combined with hardness and toughness in the application of high performance drills and common milling machines.
High-quality alloy bit surface will take the coating treatment, such as aluminum nitride chromium (ALCRN) coating, the coating for single-layer coating, thickness 4μm, micro-hardness up to 3200HV, 0.35 friction coefficient, thermal stability of 1100 degrees Celsius. The color of the bit is bluish gray after coating. After coating, the alloy bit can process low alloy steel and high strength steels. High hardness steel can reach 54HRC.Drill Bits
In the past, it has been assumed that drilling must be carried out at lower feed and cutting speeds, which was once correct in the processing conditions of the common drill. Now, with the advent of cemented carbide drills, the concept of drilling has also changed. In fact, through the correct selection of the appropriate carbide drill bit, can greatly improve the drilling productivity, reduce the cost per hole processing.Drill Bits