IRUX25: Pokud by to někdo hledal jako já (
http://en.wikipedia.org/wiki/Friction_drilling ):
Advantages:
- Very quick process (2 to 6 seconds)
- The process reshapes all material so that no material is lost. The excess material forms a sleeve that is about 3 times longer than the original thickness of the target material, which makes it possible to make very strong bolt joints in thin material.
- It is a clean process because no litter (particles) is produced.
- No access needed to back of workpiece, as with rivet nuts.
- Works in almost all kinds of metal.
Disadvantages
- Friction drilling is not possible in massive material since displaced metal must be able to flow somewhere. Maximum material thickness is typically half of the hole diameter with bit manufacturers providing specific guidance.
- The target material must be able to withstand the added heat. Materials that have been painted, plastic coated, galvanized, or heat treated are often unsuitable for this process.
- Requires higher motor capacity and rotational speed than conventional drills.