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Selection of drill bit material
PDC And Tungstan carbide bit
According to the processing characteristics of the material, the requirements of the drill bit has the following characteristics: the hardness of the drill must be greater than the hardness of the workpiece to be processed because the drill bit when subjected to a great torsion and axial force, it must have sufficient strength and toughness; Due to the toughness of the material to be processed, cutting edge when required to be sharp enough, so the tool material must have sufficient wear resistance, so as to reduce the work hardening; due to the chemical properties of the workpiece to be high, so the tool material and titanium alloy affinity difference , In order to avoid the travel caused by the proliferation of sticky knife, broken drilling phenomenon.
At present, the types of materials suitable for doing tool extremely wide, including tool steel, carbide, superhard materials.
At first, try to use ordinary high-speed steel drill bit for testing, ordinary high-speed steel drill bit low price, when using coating technology, can significantly reduce the friction coefficient of the tool and the workpiece to improve tool life. However, due to higher speed machine, the use of drill strength is not enough, resulting in the process of drilling bit broken, the effect is not satisfactory.
Carbide is the latest development of a tool material, suitable for most of the rough finishing of materials, including steel, cast iron, special materials and plastics. To this end, decided to use the overall carbide drill.
