Method for manufacturing extension press bolt with extension sleeve and extension press bolt manufactured thereby

摘要

The invention relates to an expansion press-fit bolt provided with an expansion sleeve (2) having an expansion area (8) with a longitudinal slot (5). In order to enlarge the surface of the expanding slab 2, which is critical for high anchoring efficacy, the longitudinal slots 5 are formed without gaps. The creation of the gapless longitudinal slots 5 can be carried out by a flow press operation with the patches remaining between the longitudinal slots 5 compressing in a radial direction.