System and method for coldworking holes in a workpiece
US9744628B1 · kind B1 · utility
Inventor
Key dates
| Filing date | Dec 9, 2016 |
| Grant date | Aug 29, 2017 |
| Priority date | — |
| Expiry date | Dec 9, 2036 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23P11/02
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Systems and methods for coldworking metal are described that reduce the axial flow of metal and increase the radial/tangential flow, thereby improving the fatigue life at an aperture. A tool is inserted through an aperture and its travel speed is reduced when in contact with the metal to reduce axial plastic flow. A sensor as part of the motive system moving the mandrel can sense when the tool contacts the metal and reduces the speed of the tool. The tool may move more quickly when not in contact with the metal to reduce working time than when the mandrel is working the metal. The coldworking tool engages the metal at the aperture at a speed of less than the speed which results in the time duration for the mandrel engaging the metal at the aperture for 35 second per inch of metal thickness at the aperture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.