Base plate for suspension assembly in hard disk drive with taper

Details Base plate for suspension assembly in hard disk drive with taper Base plate for suspension assembly in hard disk drive with taper

1997-09-16

2000-03-07

Thibodeau, Paul

Stock material or miscellaneous articles

Structurally defined web or sheet

Including aperture

428596, 428599, 360104, 29523, B32B 310, B21B 3700, G11B 548, B21D 3900

Patent

active

060337559

ABSTRACT:
A base plate wherein the inner barrel of the base plate hub is comprised of two distinct zones. The first zone is an inner diameter sized for use with standard tooling pins in an assembly process as a metric for size control. The second zone is a taper for distributing tension swage force and plastic strain toward the rear part of the hub by making the hub stiffer as the swage ball proceeds downward through the barrel, and for distributing compression swage force and plastic strain toward the rear of the hub by relieving stiffness as the swage ball proceeds upward. A back side slope is provided to prevent washed metal from creating added swage force and plastic strain during swaging in the compression direction. The base plate has a minimal counter bore, a lead-in chamfer which is shallower than typical, a second lead-in chamfer which is very steep and upon which the ball begins to swage, a small inner diameter region to allow for tooling during assembly, and a tapered backside to reduce unneeded material.

REFERENCES:
patent: 4991045 (1991-02-01), Oberg
patent: 5461524 (1995-10-01), Jurgenson
patent: 5646802 (1997-07-01), Akiyama et al.
patent: 5689389 (1997-11-01), Braunheim
patent: 5717545 (1998-02-01), Brooks, Jr. et al.
patent: 5870254 (1999-02-01), Baserman et al.
patent: 5872687 (1999-02-01), Arya et al.
patent: 5879578 (1999-03-01), Chung et al.

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