Stainless Steel Sheet Metal Motors Micro Machining Parts

Drill Material

The drill bits for drilling plates generally use carbide, because epoxy glass cloth compound copper foil plate on the tool wear particularly fast. The so-called carbide is based on tungsten carbide powder as the matrix, cobalt powder as a binder by pressure, sintering. Usually contains 94% tungsten carbide and 6% cobalt. Due to its high hardness, very wear-resistant, has a certain strength, suitable for high-speed cutting. However, the toughness is poor, very brittle, in order to improve the performance of carbide, some use the carbonized substrate on the chemical vapor deposit of a layer of 5 to 7 microns of special hard titanium (TIC) or titanium nitride (TIN), so that it has a higher hardness. Some use ion injection technology, titanium, nitrogen, and carbon into its base of a certain depth, not only improve the hardness and strength, but also when the drill bit heavy grinding these injection components can also be internally removed. There are also physical methods in the top of the drill to create a layer of diamond film, greatly improve the hardness and wear resistance of the drill bit. The hardness and strength of carbide are not only related to the ratio of tungsten carbide to cobalt, but also to the particles of powder. The average size of a carbide phase grain of ultrafine particles is less than 1 micron. This type of drill is not only high hardness but also high pressure and bending strength are improved. In order to save money many drills using welding handle structure, the original drill bit is a whole are carbide, the rear of the drill handle using stainless steel, the cost is greatly reduced but the use of different materials its dynamic concentricity is not as good as the overall carbide drill, especially in small diameter.

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