Process for making a screw unloseable, fixation collars for pipes and use of the process to manufacture the collars

摘要

The method for making a screw (4,5) which cannot be lost comprises the following stages. The formation of a part with an orifice with swaging of the orifice circumference (1111) so that the orifice dimensions are sufficient for the passage of the screw body (41). The screw is placed so that the orifice perimeter is opposite a groove (40) machined in the screw perimeter. Pressure crimping of a mold on the orifice perimeter to hold the screw.