Method of making a tubular body having a deformable internal skirt
US5478280A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 21, 1993 |
| Grant date | Dec 26, 1995 |
| Priority date | — |
| Expiry date | Sep 21, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21K21/08
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A tubular body (74, 102) having a deformable internal annular skirt is made from a blank (10, 80) having a stopped bore (20) which terminates at an end wall (24). First, an aperture (40) is formed in the end wall (24) to provided a through bore, of which a main region is provided by the formerly stopped bore (20). The aperture (40) is made to taper towards the main region and to a diameter substantially smaller than that of the main region. Material peripherally of the aperture (40) is then swaged towards and into the main region, and radially outwardly in the main region, thereby forming the swaged material into a skirt. The tapering aperture (40) can be formed by use of a punch (30) and a die (32) having a die aperture (36) larger than the punch diameter. By making the aperture (40) not radially symmetrical, the resulting skirt (70, 98) can be made of unequal lengths on opposite radii. The aperture (114) can be made non-symmetrical by using a punch slightly offset from the axis of the die aperture (36) or by making the end wall of different thickness on different radii.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.