Tube element locking method, involves using uneven tools during shaping of tubes, and using bolt with middle increase on front side, and providing bolt with tooth and/or grooves, which bring forward material flow of tubes

摘要

The method involves using uneven tools during shaping of tubes, and using a bolt with middle increase on a front side. The bolt is provided with tooth and/or grooves, which bring forward a material flow of the tubes in a desired direction. A capsule-shaped device is used to support the tubes radially during tube forming process. A partially heated tube end or an alternative coil integrated into the bolt is used.