Browse Prior Art Database

Flexure with Zig-Zag Hip Tab Attachments to Strip Frame

IP.com Disclosure Number: IPCOM000115730D
Original Publication Date: 1995-Jun-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 102K

Publishing Venue

IBM

Related People

Frater, N: AUTHOR [+3]

Abstract

A suspension for a Head-Gimbal Assembly (HGA) used in a disk storage drive is welded from a strip containing flexures and a strip containing load beams as shown in Fig. 1. The flexures are joined to the strip frame using frame members with a unique zig-zag configuration which attach to the central part of the flexure instead of at the tongue end as shown in Fig. 2. The attachment to the central "hip" part of the flexure allows the critical pitch and roll angles of the flexure tongue (the surface to which the slider will be bonded) to be accurately measured in the strip prior to welding and shearing. The zig-zag pattern of the frame members allows strip length variations to be accommodated without introducing flexure misalignment on the completed weldment.

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Flexure with Zig-Zag Hip Tab Attachments to Strip Frame

      A suspension for a Head-Gimbal Assembly (HGA) used in a disk
storage drive is welded from a strip containing flexures and a strip
containing load beams as shown in Fig. 1.  The flexures are joined to
the strip frame using frame members with a unique zig-zag
configuration which attach to the central part of the flexure instead
of at the tongue end as shown in Fig. 2.  The attachment to the
central "hip" part of the flexure allows the critical pitch and roll
angles of the flexure tongue (the surface to which the slider will be
bonded) to be accurately measured in the strip prior to welding and
shearing.  The zig-zag pattern of the frame members allows strip
length variations to be accommodated without introducing flexure
misalignment on the completed weldment.  Also, the frame members can
be sheared from the completed suspension without damaging the fragile
flexure legs and adversely affecting flexure pitch and roll angles.

      A strip frame holding 10 individual flexures are welded in a
gang fixture to another strip frame holding 10 individual load beams.
Dimensional tolerances in the strip from part to part due to etching
and processing can cause the individual parts to deflect when they
are loaded onto a single fixture for welding.  Since there is an
offset distance between the tooling hole and the flexure tongue
holding the load dome (the formed feature which transmits load from
the load beam to the slider), any angular misalignment of the flexure
during welding results in misalignment of the load dome to the slider
during higher level assembly process.

      With conventional tip tabs, strip length variations cause
individual flexures to have angular deflections when placed over the
weld fixture tooling pins, which results in misalignment of the
flexures and load domes during welding.  With the zig-zag
configuration of frame members, strip length variations are found to
produce nearly lateral deflection of the flexures without significant
angular rotation.  This nearly parallel motion was found to be
produced from the slight buckling and rotation of the zig-zag frame
members.  In particular, the four acute angles and the inward
parallel member shown in Fig. 2 were found to be necessary to produce
the parallel moti...