Means for determining maximum ironing reduction
US4730483A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 14, 1986 |
| Grant date | Mar 15, 1988 |
| Priority date | — |
| Expiry date | Mar 14, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N3/28
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Apparatus and method for determining the fracture resistance of thin wall hollow articles when ironed, the method including the step of providing a drawing die and punch or a mandrel having a portion thereof tapered in a continuous, linear manner. The taper is such that it provides a continuous decrease in punch-to-die clearance when the two are moved together, and thus a continuous range of ironing reductions along the side wall of an article located between the punch and die. The taper of the punch begins adjacent the forward end thereof and is sized to effect conventional thinning of the side wall of the article at the onset of ironing. The final diameter of the taper of the punch, however, is such that fracturing of the side wall is assured in the ironing process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.