LISI AEROSPACE
I
N
N
O
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V
A
T
I
O
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Fasteners
Ashorter thread to reduce themass
and the installation time
In heavily loaded metallic or hybrid junction zone boxes, fasteners mounted in
interference are needed to ensure the structuralmaintenance of assembly in fatigue.
PULL- IN™andPULL-STEM™systemsof LISIAEROSPACE for several yearshavebeen the
referenceforthistypeofapplication.Constraints intermsofergonomics, installationtime
and respect for theenvironment have forced theDivision todevelopboth the rangeof
fastenersandtoolsassociatedwiththissystem,toremain leadersonthisproduct line.
NewgenerationPULL - IN™andPULL -STEM™
In2013, newbindingsHigh InterferencePULL - IN™havebeendesignedwitha shorter
thread to reduce themassand the installation time. ThePULL -STEM™ rangehasbeen
extendedwithball-joint heads to facilitateassembliesona slope.New tools andmore
ergonomic hydraulic groups have also been developed. They helped to convince new
customers, like the Brazilian EMBRAER for its military transport KC390, the Chinese
COMAC on the C919 aircraft, or even the American rocket SPACE X constructor in the
spatial field.
LISI 2013
29
60h
This innovationmakes it
possibletosave60hours
ontheassembly
ofanaircraft
Ball-jointheads
tofacilitatethe
assembliesonslopes
Fasteners
Lighterandfaster-to-use
fasteners
Assembly of systems in appliances (electrical cables, fluid pipes, interior trim, etc.) is a
particularly importantchallenge formanufacturers.This typeof connection isoften realized
bymeans of hexagon standard screw heads, onwhich are added the washers in order to
reduce contact pressure. On a long-haul A350 type 50,000 screws andwashers necessary
forassembling representamassofnearly200kilos.On theAssembly lines, thewasher that
must bepre-assembledon the screwby the operator, regularly drops. It therefore imposes
additional recovery operations of lost parts in the structure of the plane. Working from
the functional need expressed by aircraft manufacturers, LISI AEROSPACE has designed
an optimized screw that incorporates a “captive” flat washer. This innovation allows our
customersa60%massgaincomparedtoconventionalsteelscrewsandasavingofmorethan
60hoursontheassemblyofanaircraft.
