Metal deforming – By use of closed-die and coacting work-forcer – Forcing work into or within closed die; e.g. – forging
Patent
1977-08-15
1978-12-19
Gilden, Leon
Metal deforming
By use of closed-die and coacting work-forcer
Forcing work into or within closed die; e.g., forging
10 11R, 72441, 72443, B21D 7200
Patent
active
041300050
ABSTRACT:
A method and apparatus of cold forming is disclosed for improving die life. During a first phase a workpiece is initially engaged between a pair of dies with a sufficiently low force and velocity level to reduce die errosion but with a sufficiently high level to produce limited deformation of the workpiece and provide an area of mating engagement between the workpiece and the tool and die. During a second phase the workpiece is subjected to substantially higher deforming force and velocity levels and is further deformedto the desired shape. Such area of mating engagement is sufficiently large to reduce errosion producing localized pressures on the tool and die during such second phase. The disclosed machine is a ball header with the movable die mounted directly on the machine frame rather than on the reciprocating slide. The position of the movable die is controlled by a cam driven pusher so that the movable die position is independent of the position of the reciprocating slide. In such machine a workpiece is initially gripped during such first phase while the movement of the tool is controlled by the cam. In the second phase the tool is driven forward by the crank driven slide.
REFERENCES:
patent: 1007792 (1911-11-01), Orton
patent: 1204127 (1916-11-01), Canda
patent: 1910384 (1933-05-01), Ekjergian
patent: 2073239 (1937-03-01), Byerlein
patent: 3747144 (1973-07-01), Meerendenk
patent: 3859838 (1975-01-01), Karsnok
patent: 3919874 (1975-11-01), Harris
Gilden Leon
The National Machinery Company
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