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Rotary Printed Circuit Board Rework Unit

IP.com Disclosure Number: IPCOM000119672D
Original Publication Date: 1991-Feb-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 2 page(s) / 86K

Publishing Venue

IBM

Related People

Young, AS: AUTHOR

Abstract

Described is a production tool for the removal and replacement of Pin Through Hole Components on SMT cards and which is an enhancement of the tool described in the preceding article. Employed is a flow solder method achieved by a solder pump incorporated in a pot to lift solder up to the working point of the tool. As the mass of solder is constantly moving through and over the tool bit, improved heat control is maintained at component removal position.

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Rotary Printed Circuit Board Rework Unit

      Described is a production tool for the removal and
replacement of Pin Through Hole Components on SMT cards and which is
an enhancement of the tool described in the preceding article.
Employed is a flow solder method achieved by a solder pump
incorporated in a pot to lift solder up to the working point of the
tool.  As the mass of solder is constantly moving through and over
the tool bit, improved heat control is maintained at component
removal position.

      Benefits result from accurate control of solder temperature, a
twelve station indexing head and automatic solder flow for each
tooling shape.  Each tool shape has its own automatic setting of
contact time.  Reduced skill levels can operate the unit.

      The figure illustrates the rework machine general layout.  A
redesign of an earlier tooling transfer mechanism enabled a reduction
of the outside profile size of the machine and, with the reposition
of the control cabinets 7, improved access for setting and
maintenance is achieved. Control of the solder temperature in the
solder pot 1 is by dual height positioned bi-metal pyrometers 2,
feeding back to the PLC unit 3 in the cabinet.  This, with a
short-timed slag-flow-off, ensured an accurate contact temperature of
the solder.  A fast tool change can be selected from several
form-tools 5 in a rotary 8 indexing tool bank 4 that is automatically
controlled by the computer PLC unit.  Twelve various tools 5 are
located on the tool bank 4, the shapes and sizes of which are
selected to su...