Process for the production of a hollow workpiece being profiled at least internally in a straight or helical manner relative to the workpiece axis
US5355706A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 2, 1993 |
| Grant date | Oct 18, 1994 |
| Priority date | — |
| Expiry date | Jul 2, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21H7/187
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
The well known Grob method, as practiced on a Grob machine, uses at least a partially profiled mandrel wherein during a cold forming operation, via a forming or impact roller of a workpiece blank, produces a hollow workpiece that is profiled at least internally wherein the material is shaped radially as well as axially in a single operation and the axial and radial shaping of the workpiece blank is achieved at least internally as a whole or in part in a straight or helical manner relative to the workpiece axis, by means of this forming roller and achieves the economical production of high quality workpieces in a single operation, with outer profiling also being achievable, and the difference (D) between the outer radius (RO) of the workpiece blank and the outer radius (RD) of the mandrel preferably being the same as or smaller than the length (WL) of the finished workpiece.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.