Method of roll forming piston
US4765167A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 4, 1986 |
| Grant date | Aug 23, 1988 |
| Priority date | — |
| Expiry date | Dec 4, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49249
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
The method of forming an annular piston with a central hub, a radial pressure face and an outer cylindrical flange having an outwardly opening annular seal receiving groove which comprises the steps of forming an annular sheet metal stamping having an axial hub portion, an annular radial pressure face and an axial cylindrical flange with an annular free end portion; rotating the stamping while radially and axially supporting the hub; radially inwardly rolling and permanently deforming the flange into U-shape while simultaneously axially compressing and bending the free end portion radially inward throughout 360.degree.. The method further includes upon the stamping an axial hub portion terminating in a radial inwardly directed first flange; radially and axially supporting the hub portion adjacent its opposite ends while rotating the stamping; radially and axially supporting the first flange; radially inwardly rolling and permanently deforming part of the hub portion into an internal second flange axially spaced from the first flange while simultaneously axially compressing the hub portion relative to the first flange, the flanges defining an internal annular seal receiving groove.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.