Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Patent
1997-09-16
1998-11-10
Wysomierski, George
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
148714, 148902, C21D 802
Patent
active
058337776
ABSTRACT:
A base plate for a suspension assembly in a hard disk drive wherein the base plate has a hardened flange and soft hub. The base plate is stamped in a progressive die in a sequence of forging and coining operations. The base plate is subsequently fully annealed to allow the material to yield at a low stress level so that the hub will create a press fit against the inner wall of an actuator arm boss hole. The base plate is passed through a secondary coining operation following the annealing step to work-harden the flange portion only. The result is a base plate with a flange portion that is hardened and a hub portion that is softer than the flange portion. The advantage is that the hardened flange is more resistant to deformation of a load beam welded thereto and the hub is more disposed to plastically deform and harden during swaging which is desirable for maintaining a press fit.
REFERENCES:
patent: 3972744 (1976-08-01), Cantrell
patent: 4010969 (1977-03-01), Cantrell et al.
patent: 4129461 (1978-12-01), Rashid
patent: 4305272 (1981-12-01), Johnson
patent: 5496425 (1996-03-01), Gallagher
Hanrahan Kevin
Schmidt Ryan
Intri-Plex Technologies, Inc.
Lamb Owen L.
Wysomierski George
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