Method of making a mandrel for a self plugging blind rivet

Details Method of making a mandrel for a self plugging blind rivet Method of making a mandrel for a self plugging blind rivet

1980-06-25

1982-12-28

Combs, Ervin M.

Metal deforming

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

During rotation of work

10 27R, B21K 158, B21D 1704, B21H 306

Patent

active

043654959

ABSTRACT:
A mandrel for a blind rivet is made by first forming a mandrel blank from wire stock in a series of cold heading operations which include forming an enlarged head at one end of an elongate stem, and then scraping material from the peripheral surface of part of the head adjacent to the stem and moving the material in a direction away from the stem so as to leave a core and to form a circumferential flange-like boss from the scraped material. The mandrel blank thus produced is then subjected to a rolling operation in which the mandrel blank is rolled between contoured mandrel-rolling dies and thereby formed into a finished mandrel. In particular, the contours of the rolling dies are such as to form a breaker groove at the junction between the head and stem of the blank and to cause the material of the flange-like boss to flow over the scraped surface of the core of the head and towards the stem and form a skirt peripherally of the core while confining the material of the boss so that it does not flow across the breaker-groove. Pulling grooves are rolled in the mandrel stem and the external surface of the skirt is rolled to a cylindrical shape with, optionally, a peripheral groove therein.

REFERENCES:
patent: 1955980 (1934-04-01), Sinclair
patent: 3044332 (1962-07-01), Siebol
patent: 3148578 (1964-09-01), Gapp
patent: 3369289 (1968-02-01), Gapp
patent: 3426375 (1969-02-01), Jeal

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