Stamping in liquid female tool
US4314468A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 29, 1979 |
| Grant date | Feb 9, 1982 |
| Priority date | — |
| Expiry date | Nov 29, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D22/205
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
The present invention provides an improved method for hydro-mechanical stamping wherein hollow products are formed from flat blanks by the cooperation of a punch and a liquid female tool. The present method particularly provides for submerging in the liquid the blank which is to be stamped, the level of the liquid being also maintained above the usual stamping ring. The invention further provides apparatus which acts to center the blank relative to the stamping ring, the present apparatus comprising an additional ring rigidly connected to the stamping ring and having radial apertures therein which form portions of circuitous liquid paths through which liquid flows on stamping, the paths acting to prevent localized rupture during stamping. The present method and apparatus find particular application to the high-speed manufacture of hollow, thin-walled articles of non-cylindrical shape.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.