Metal deforming – By use of closed-die and coacting work-forcer – Forcing work into or within closed die; e.g. – forging
Patent
1993-02-18
1994-04-05
Larson, Lowell A.
Metal deforming
By use of closed-die and coacting work-forcer
Forcing work into or within closed die; e.g., forging
470 28, 470 32, 761081, B21K 144
Patent
active
052994414
ABSTRACT:
A method of making an elongated mandrel having an end integral with a drill section, with the method including the steps of subjecting a single columnar piece of material to the heading process so as to make a blank N composed of the mandrel, a short stem having one end integral with the end of the mandrel and having a diameter D greater than a diameter of the mandrel, and a flange formed integral with the other end of the stem. The short stem is then cold forged to produce the drill section having end edges (7a) and (7b) facing the flange, and, subsequently, the drill section is trimmed so as to remove the flange together with a scrap resulting from the cold forging of the stem, in such a manner that the mandrel having the integral drill section can be mass produced from the single piece of raw material, efficiently at a reduced cost.
REFERENCES:
patent: 1399132 (1921-12-01), Lindquist
patent: 2656739 (1953-10-01), Mansfield
patent: 3104161 (1963-09-01), Carlson
patent: 4026186 (1977-05-01), Williams et al.
patent: 4365495 (1982-12-01), Francis
patent: 4998853 (1991-03-01), Shinjo
Larson Lowell A.
McKeon Michael J.
Yugenkaisha Shinjo Seisakusho
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