One can easily judge the application of friction drilling by its name. This drilling process makes holes in the metals by using friction to heat the surface. Basically, the drill bit pushes the material in its way by producing heat through friction. In industrial terms, it is well known as flow drilling or thermal drilling.
The working principle of friction drilling is very simple and effective. It increases the cross-section if the thin tubular object and creates holes for industrial purposes. The material for the bit should be very hard and it is generally made of tungsten carbide. Tungsten carbide is the existing hardest material after diamond.
Focusing on its invention in 1923 a Frenchman Jean-Claude de Valerie worked on making holes by using friction heat instead of machining. It didn’t get massive success as the correct material for the bit was not there for drilling. In the year 1980, friction drilling slowly gains success with the use of correct bit material.
Principle Working of Friction Drilling
Friction drilling is the simplest way to make holes in any kind of metals. The process includes imposing friction and pressure on the target area. The friction will produce enough heat and pressure will push the bit and make a hole.
While heating, the metal gets soften and reaches the melting point. Proper lubrication is necessary to save the bit from adhering. The interesting point is that there is no loss of material but in a result, it forms a sleeve around the hole. Here the length of the sleeve can be three times more than the original thickness of the working material.
After forming a hole the process follows chip less thread formation. After the thread formation, one can check the thread by tightening the screw in the hole with proper torque and depth angle.
This process requires very high motor capacity and maximum rotational speed than other drills. Moreover, this process is not possible in the massive materials because the molten material requires space to flow.
Advantages of Friction Drilling
- The process is indeed very quick and simple (You can make a hole in just 2-6 seconds)
- There is no loss in the metal and it forms a sleeve which is three times more than the original thickness.
- Overall friction drilling is a clean and quick process to make holes.
- This process is applicable on every metal.