Titanium aluminum nitride is designed to increase the hardness and temperature resistance up to 800 degrees Celsius. Titanium nitride coating reduces friction during drilling and promotes heat dissipation. Black Oxide provides a higher level of heat resistance and improved lubrication.
In carbide drills microcracks appear on the cutting edges and as a result they cause the drill to fail.ĭrill bit coatings helps to deliver cutting fluid to the the drill bit and it makes the tool more heat resistant. In high-speed steel (HSS) tools overheating causes loss of hardness. However, overheating will destroy any drill. Carbide tipped drill bits have the ability to dissipate heat rapidly, and so will hold an edge longer and tolerate heat better than other drill bit options. Cobalt is less susceptible to heat damage than any other drill bit type, but it is also extremely brittle and prone to accidental damage. HSS drill bits are made of a steel that has a higher heat resistance than high carbon steel. If your bit spins too quickly, it doesn’t bite enough material and overheats.Ī type of the drill bit alloy defines heat resistance. Too much pressure will also cause overheating, but it is difficult to achieve in hand drills. If you don’t press the drill hard enough, the bit just spins without cutting. Typically drill bit overheating is a consequence of a wrong feed and speed combination. Even minimal lubrication keeps the bit from burning up, but very good lubrication extends bit life by a factor of 5 or even 10.
The lubrication reduces heat build-up, prolongs drill bit life and helps to avoid heat fractures in the material. Water, oil or other coolant are widely used to remove heat and lubricate the cutting edges of the drill bit. The drilling tool absorbs heat, its temperature rises, and it can lead to premature wear. Remain is spent on residual changes in the tool and the destruction of material. Up to 90% of the energy, supplied to the tool, causes heat release. Drilling is energy-intensive technological processes.
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