Method for controlling the quality of a blind fastener installation
US11826816B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 7, 2022 |
| Grant date | Nov 28, 2023 |
| Priority date | — |
| Expiry date | Mar 7, 2042 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21J15/043
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
This relates to a method for the quality control of a blind fastener installation in a structure comprising a sleeve and a core bolt, with a deformation of a rear side of the structure, a signal being generated during the installation process. The process includes a) identification of two notable points of the signal, chosen among: pulling start point (S1); buckling (B1) of the sleeve; contact (B2, S2) of the sleeve or of the core bolt; force setpoint (B3) or fracture (S3) of a portion of the core bolt; b) estimation of a first parameter as a function of a notable point, characterizing a bulb in contact with the rear side; c) estimation of a second parameter as a function of a notable point, characterizing a tension applied in the core bolt; and d) for each estimated parameter, comparison with a condition that indicates the proper installation of the fastener.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.