Device for drawing sheet material on a drawing die composed of elastically yieldable material
US5361617A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 25, 1993 |
| Grant date | Nov 8, 1994 |
| Priority date | — |
| Expiry date | May 25, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49805
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
The device having a die formed by a cushion (2) composed of an elastically yieldable material, such as for example an elastomer, disposed in a retaining box (1), a mechanism for predrawing a sheet blank (6), constituted by an outer slide carrying an upper blank holder (4a), a mechanism for finally drawing said sheet blank (6), constituted by a central slide acting on a plunger (5), and a first mechanism (10) for absorbing excess volume of the cushion (2) relative to the volume determined by the surface of the finished part to be obtained in the course of the final drawing of the part. The device further comprises at least one second mechanism (20) for compensating for the excess volume of the cushion (2) due to variations in physical characteristics of the material of the cushion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.