High energy impact riveting apparatus and method
US5471865A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 9, 1993 |
| Grant date | Dec 5, 1995 |
| Priority date | — |
| Expiry date | Sep 9, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/53774
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method and apparatus for forming a metal object such as upsetting a fastener in a workpiece wherein first and second coils are provided in close proximity to and in electromagnetic association with each other, the first coil is in driving association with a forming tool adapted for forming the metal object and the first and second coils are supported in a manner allowing movement of the first coil relative to the second coil, and wherein an electric current pulse is supplied simultaneously to the first and second coils to produce a repulsive electromagnetic force sufficient to accelerate the first coil and driving the forming tool to form the metal object, the pulses being shaped in accordance with a characteristic of the metal object. The pulse shaping includes matching the magnetic force based on the current pulse with the stress-strain characteristic of the metal object being formed. In high energy impact fastener installation apparatus, there is balancing of the applied force from both ends of the fastener during simultaneous impact and upset to eliminate transfer of force to the workpiece and supporting structure. Advantages include a relatively less drastic fall off of mutu…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.