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This innovation will require further collaboration with a setting tool
manufacturer to implement existing “state of the art” load sensing, and
feedback control techniques. As raw material costs continue to rise,
however, this disruptive innovation is expected to be adopted in high
volume applications. The blind rivet setting process for the modified
stepped approach is illustrated below (figure 9a to 9f).
Blind rivet mandrels now contain about two-thirds of the total material,
by weight, of an assembled blind rivet. The cost proportion is usually
greater as cost per kg. of blind rivet mandrel wire is generally more
expensive than that of the blind rivet body.
With significantly less material being required for the basic blind rivet,
rivets with costly highly stressed aluminum mandrels or stainless steel large users of blind rivets, such as those in the automotive, commercial
blind rivets with costly stainless steel mandrels, are considerable. aircraft, and fabricated metal parts industries can now reduce their
Savings result as mandrel length and raw material are reduced. With overall blind rivet installed costs. An additional benefit may also be a
solely a nosepiece redesign, productivity is identical to current methods small contribution toward reducing global warming as less energy is
and may even be slightly higher. This higher productivity will be
used to produce and ship the unnecessary mandrel length.
experienced as the shorter mandrels feed to and from the setting tool
more efficiently. Mandrels are less likely to bend and jam in the
End users or blind rivet and setting tool manufacturers desiring to help
setting tool as the mandrels travel through the tool and are later
bring this blind rivet to the “tipping point” or learn more about the
disposed. Installers collecting the spent mandrels will also find the
global blind rivet fastening solution market segment are welcome to
bottles will not have to be emptied as frequently.
contact me at:
htaylor@mba1974.hbs.edu
Production, packaging expenses, and transportation expenses for
assembled blind rivets will also be lower. Mandrel production and
assembly speeds will be increased and packaging productivity will be
higher as a greater number of blind rivets are shipped in existing or
smaller shipping cartons. With a lighter product, shipping costs will
also be reduced.
Further mandrel length reduction possible with a modified
stepped setting process
An additional embodiment of the invention and US and International
Patent Applications details how to further shorten mandrel length by
another 20%, and set blind rivets in a modified stepped approach.
Here, mandrels extending less than one-half inch above the blind rivet
flange can be set by using a process that is a function of the Load /
Mandrel Displacement curve or “Fingerprint” (Illustrated top right) for a
particular blind rivet application. In the stepped setting method, a
substantially shortened mandrel is first pulled under low load with
partial jaw engagement into Zone C. The setting tool jaws are then
released and, within a split second, reengaged fully, to bring the
mandrel to the breaking point and set the blind rivet.
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