Carbide Drill Bit Reasonable Choice
Use of cemented carbide drill bits for consideration:
Carbide Drill Bit Machining accuracy
Carbide Drill Bit When choosing cemented carbide drill bits, it is necessary to consider the dimensional accuracy requirements of drilling. In general, the smaller the machining aperture, the smaller the tolerances. Therefore, drill bits are usually classified according to the nominal diameter dimensions of the machined holes. In cemented carbide drill bits, the machining precision of the whole cemented carbide drill is the highest (φ 10mm overall carbide drill bit is 0~0.03mm), so it is the best choice for machining high-precision holes.
Carbide Drill Bit Welded carbide drill bits or replaceable cemented carbide crown bits of the tolerances range for 0~0.07mm, more suitable for the general precision requirements of the hole processing; the drill bits with cemented carbide indexable inserts are more suitable for heavy duty roughing, although its processing cost is usually lower than the other bits, but its machining accuracy is also relatively low, the tolerance range is 0~0.3mm (depending on the drill bit's diameter ratio), so it is generally used for the precision of the hole processing, or need to follow the finishing holes.
Carbide Drill Bit Machining stability
Carbide Drill Bit In addition to considering the drilling accuracy requirements, the selection of drill bits should also consider the stability of machining machine tools. The stability of machine tool is very important for the safe service life and drilling accuracy of drill bits, so it is necessary to examine the working status of the spindle, fixture and attachment. In addition, the stability of drill bits should be considered.
Carbide Drill Bit The overall cemented carbide drill has the best rigidity, so it can achieve high machining accuracy. and carbide indexable blade bits are structurally unstable and prone to deflection. Welded carbide drill bits and replaceable cemented carbide crown bits are composed of two symmetrical cutting edges that can be self-centering geometric blade.
Carbide Drill Bit This high stability cutting blade design makes it not necessary to reduce the feeding rate when cut into the workpiece, only when the bit inclined to install and the workpiece surface into a certain dip angle in the exception, at this point is recommended to drill into, drilling, the feeding rate will reduce 30%~50%. Because of this kind of drill bits of steel can produce small deformation, so it is very suitable for lathe machining; the whole cemented carbide drill bit because of the brittle, used in lathe machining is easier to break, especially when the drill bit centering in poor condition.