Method and apparatus for measuring forces on a workpiece during drawing or ironing
US4779442A · kind A · utility
7Cited by
1References
23Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 12, 1987 |
| Grant date | Oct 25, 1988 |
| Priority date | — |
| Expiry date | May 12, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D22/28
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method and apparatus for measuring the sidewall tension in a workpiece being drawn through a draw die and/or ironing die. A punch is provided which is adapted to measure and continuously monitor the axial load on the punch nose and the total axial load on the punch, the distribution of such loads around the periphery of the punch, and bending of the punch near the base and nose due to lateral and nonuniform forces acting on the punch as the workpiece is forced through a die or dies. Determination of the forces, their distribution, and punch bending enables accurately determining the tensile stress at any portion of the sidewall.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.