Method and apparatus for forming a collar around a hole in a she

Details Method and apparatus for forming a collar around a hole in a she Method and apparatus for forming a collar around a hole in a she

1989-02-06

1990-11-13

Spruill, Robert L.

Metal deforming

By use of tool acting during relative rotation between tool...

During rotation of work

72102, B21D 2200

Patent

active

049693450

ABSTRACT:
An upstanding collar is formed around a hole in a sheet metal blank by means of a converter tool which converts an edge region bordering the hole into the collar, while the blank is rotated relative to the converter tool. This method comprises (i) in a first stage, converting a portion of the blank into a first turned-up rim, (ii) after the first stage, converting a further portion of the blank into a second turned-up rim, (iii) in at least one further stage repeating step (ii) successively converting each time a further portion of the blank into another turned-up rim, until the whole of the edge region has been converted, wherein (a) in at least one of the stages the conversion takes place on free air, and (b) in all these stages the conversion takes place in the same direction relative to the blank. A converter tool increasing stepwise in diameter may be used.

REFERENCES:
patent: 173808 (1876-02-01), Nugent
patent: 304671 (1884-09-01), Shepard
patent: 422615 (1890-03-01), Nugent et al.
patent: 977740 (1910-12-01), Higgins
patent: 1670216 (1928-05-01), Savadow
patent: 1830865 (1931-11-01), Zang
patent: 2193050 (1940-03-01), Wiest
patent: 2254289 (1941-09-01), Jensen
patent: 2370666 (1945-03-01), Johnson
patent: 2636253 (1953-04-01), Rees
patent: 3709016 (1973-01-01), Breidert et al.
patent: 3812698 (1974-05-01), Stock
patent: 3924432 (1975-12-01), Yarnold

Affiliated with

Also associated with

Rating

Method and apparatus for forming a collar around a hole in a she does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for forming a collar around a hole in a she, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for forming a collar around a hole in a she will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-770276