Metal deforming – By use of closed-die and coacting work-forcer – Forcing work into or within closed die; e.g. – forging
Patent
1988-08-31
1989-12-19
Larson, Lowell A.
Metal deforming
By use of closed-die and coacting work-forcer
Forcing work into or within closed die; e.g., forging
291565R, B21K 0118
Patent
active
048874493
ABSTRACT:
A method for forming a cup-shaped piston having a peg comprises a first preform step forming a first preform having a flat top surface and a recessed portion at its bottom, a second preform step forming therein a second preform having a projecting or recessed portion on the top surface of the end portion in order to readily form a peg, and a final step finishing the second preform to have the cup-shaped piston having the peg.
REFERENCES:
patent: 2747266 (1956-05-01), Schaming
patent: 2760263 (1956-08-01), Geertsen
patent: 2797595 (1957-07-01), Smith et al.
Hayashi Katsunori
Kanai Tamotsu
Akebono Brake Industry Co. Ltd.
Larson Lowell A.
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