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Browse Prior Art Database

Solder Leveling/Removing Tool for Surface Mounted Technology Component Leads

IP.com Disclosure Number: IPCOM000114307D
Original Publication Date: 1994-Dec-01
Included in the Prior Art Database: 2005-Mar-28
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Ervin, WM: AUTHOR [+3]

Abstract

Disclosed here is a tool for removing and leveling solder on surface mounted components. It is used to prepare the components for reuse after they have been desoldered.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 88% of the total text.

Solder Leveling/Removing Tool for Surface Mounted Technology Component
Leads

      Disclosed here is a tool for removing and leveling solder on
surface mounted components.  It is used to prepare the components for
reuse after they have been desoldered.

      When surface mounted (SMT) devices are removed from assemblies
for reclamation or other purposes, there is excess solder left on the
leads.  The amount and shape of the solder on the leads is quite
variable.  This excess solder interferes with the placement of the
components back onto another circuit card (particularly when it is
being placed by automated equipment).  There are two main problems:
  1.  Excess solder can cause bridges.
  2.  The solder affects the coplanarity of the leads as viewed by
the
       placement machines, causing them to reject the devices.

      The disclosed tool, as shown in the accompanying Figure, passes
hot air over the leads to blow off the excess solder.  This is then
collected by a vacuum tube mounted on the other side of the lead.
The hot air is supplied by a soldering tool (such as an EDSYN * model
PS537).  The air is directed over the lead and away from the
component body.  This avoids heating the bodies of the components.

      The hot air pencil and vacuum tube are mounted to a fixture
which allows them to be positioned over the device.  The device
itself is placed in the fixture with its leads up.  The fixture table
can then move back and for...