Method for manufacturing high precision slugs

Details Method for manufacturing high precision slugs Method for manufacturing high precision slugs

1979-03-26

1981-03-03

Gilden, Leon

Metal deforming

By use of closed-die and coacting work-forcer

Forcing work into or within closed die; e.g., forging

291592, 72377, B21D 2202

Patent

active

042533236

ABSTRACT:
A method is provided for the formation of high precision metal slugs by cold forming. A metal column starting material is subjected to a preforming step in which the starting material is cold forged with a pair of upper and lower metal dies provided with concave recesses to produce a primary product having a barrel shape having a high degree of parallelism on the ends. The resultant primary product is subjected to an upsetting step in which the barrel shape is crushed while maintaining parallelism to obtain a secondary product. The resultant secondary product is then subjected to an ironing step in which the outer diameter of the secondary product is reduced to obtain a high precision slug having an outer diameter which is substantially the same as the outer diameter of the desired final product for which the slug will be utilized.

REFERENCES:
patent: 1303577 (1919-05-01), Murray
patent: 3169638 (1965-02-01), Reinberger
patent: 4069571 (1978-01-01), Nelson
patent: 4111031 (1978-09-01), Vennemeyer

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