TPT November 2015

32 / 92

Technology News
30 November 2015
Double end finishing machine for
bent aerospace elbows
HAVEN is an expert in double end
finishing equipment for applications
ranging from simple chamfering to
extremely tight tolerance specifications,
such as automotive shock absorbers.
These standard applications have
a common feature: the work piece is
straight. However, this was not the case
for an aerospace supplier that required
an automatic machine to perform
chamfering and end facing on both ends
of a bent tube elbow.
The challenge posed to Haven was
to design a machine that would end
finish both ends of a bent tube, in one
setup. In addition, the machine had
to be programmable to automatically
adjust feeds and speeds for infinite tube
diameters and lengths, and not all parts
are symmetrical.
A traditional dual spindle arrangement
would not be practical. Haven engineers
had to devise a way to precisely rotate
the part from one end to the other and
accurately machine both ends without
enduring a lengthy setup process.
The solution was to use a servo-
controlled index turntable and a servo-
controlled precision bearing spindle.
The accuracy of these devices was
needed to position the part to an exact
location and then feed the cutting tool
to the proper depth, which established
the finish length for each leg of the
elbow. With repeatability achieved, a
program had to be developed that would
accommodate dozens of diameter and
length combinations. Haven’s system
engineers custom designed a user-
friendly program and operator interface
for entering part parameter data. To
make a changeover, the operator
simply chooses the part number from
a menu to change the program. On the
mechanical side of the machine design,
the work piece fixtures were machined
to the shape of the part.
This machine replaces a manual
operation that had difficulty maintaining
dimensional consistency. Haven’s
solution not only improved productivity
and quality, but also resulted in a more
capable downstream assembly process.
Haven Manufacturing – USA
Fax: +1 912 264 9001
Website:
EUROMÁQUINA S.L.
AVDA. PIRINEOS 7 - 5.A - 28703 - S.S. DE LOS REYES - MADRID -SPAIN
TEL: (+34) 916587260 - -
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Haven’s special double end finishing
machine for bent elbows