Selection and Technical Application of Tungsten Carbide Drill

Tungsten carbide drill is based on tungsten carbide powder, cobalt powder as binder by pressure, sintering. Usually containing tungsten carbide 94%, 6% cobalt. Because of its high hardness, very wear-resistant, have a certain strength, suitable for high-speed cutting. But poor toughness, very brittle, in order to improve the performance of cemented carbide, and some on the use of carbonized substrate in the chemical vapor deposition of a layer of 5 to 7 microns of special hard titanium carbide (TIC) or titanium nitride (TIN) Has a higher hardness. Some use ion implantation technology, the titanium, nitrogen, and carbon into the substrate a certain depth, not only improve the hardness and strength, but also in the drill regrind when the injection of these ingredients can move inward. There are physical methods used in the top of the drill bit to generate a layer of diamond film, greatly improving the hardness and wear resistance of the drill.

Selection of Tungsten Carbide Drill Material
According to the processing characteristics of the material, the requirements of the tungsten carbide drill  has the following characteristics: the hardness of the drill must be greater than the hardness of the workpiece to be processed as the workpiece in the workpiece to withstand a great torsion and axial force, it must have sufficient strength and toughness; Due to the toughness of the material to be processed, the cutting edge is required to be sharp enough for cutting, so the tool material must have sufficient anti-wear ability, 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.

Tungsten 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 tungsten carbide overall drill.

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