Method of forming high quality forgings

Metal deforming – By use of closed-die and coacting work-forcer – Forcing work into or within closed die; e.g. – forging

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B21D 2200

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042077621

ABSTRACT:
A method of forming forgings having controlled grain characteristics and reduced residual stresses. In accordance with the method the amount of stock used for a particular forging preferably only slightly exceeds the amount of stock for the finished forging, with the blocking operating being controlled and performed so that the maximum flash anywhere on the part after the finishing operation and prior to trimming does not exceed a specified limit. Specifically, for the preferred method there should be a substantially equal amount of flash movement through the parting line of the finishing die around the entire periphery of the part, not exceeding a one-to-one ratio in the metal movement width through the flash land to the flash land width of the finishing die. Such control avoids excessive localized flow in the adjacent region of the forged part to avoid localized unfavorable material characteristics as a result thereof.

REFERENCES:
patent: 168322 (1975-10-01), Clapp
patent: 183761 (1976-10-01), Hammond
patent: 1631623 (1927-06-01), Cochran
patent: 2743478 (1956-05-01), Hodou et al.
patent: 2984865 (1961-05-01), Mumford
patent: 3314278 (1967-04-01), Bergman
patent: 3918870 (1975-11-01), Tetzlaff
"Metals Handbook," 87th edition, vol. 5, pg. 23.

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