Vernon M Kelly

US Patent:

42077621, Jun 17, 1980

Filed:

Aug 11, 1978

Appl. No.:

5/932777

Inventors:

Vernon A. Kelly - Long Beach CA

International Classification:

B21D 2200

US Classification:

72360

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.