Hydraulic forming process and apparatus
US4459836A · kind A · utility
Inventor
Key dates
| Filing date | Jan 21, 1982 |
| Grant date | Jul 17, 1984 |
| Priority date | — |
| Expiry date | Jan 21, 2002 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D26/031
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Apparatus and method for forming a peripheral skirt on a workpiece of metal or other ductile material with reduced pleating of its peripheral edge. The concentric mating male and female dies of the prior art are provided, and in addition at least one drawbar concentric with, outside of, and generally beside the male die guides the outer periphery of the workpiece as the dies are urged together, preventing the outer margin of the workpiece from being folded under and propagating pleats. The drawbars also assist in clamping the outer margin of the workpiece between the dies when the central portion of the workpiece is to be expanded by the application of fluid forming pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.