TPT May 2015

28 / 92

Technology News
26 May 2015
Combining the advantages of axial
and roll forming
IN tube forming, time-consuming and
expensive soldering and welding are
often deployed, especially for tube
connections. transfluid Maschinenbau
is involved in finding a solution to the
challenge of deploying more efficient
methods.
Managing director Stefanie Flaeper
explained the technical options:
“Forming geometries are the answer to
most of the requirements here, offering
distinct economic advantages. They may
be produced with absolute reliability of
processing and functionality. Especially
forming geometries with O-rings are of
particular significance in many products,
as found in the automobile industry, for
instance. Geometries which include a
flange for fitment at a later stage are
also often needed.”
Forms of this type are
ideally created using machines
capable of both swaging and
rolling. The specially developed
transfluid combination systems
automatically feed such external
components during swaging as
needed, accurately positioning
and fastening them. This
process also creates a pre-form,
which may be required for any
downstream rolling.
Rolling produces the final
geometry, creating surfaces
for optimal application. “The
tolerances, incidentally, are quite
comparable with tolerances
produced during machining,”
explained Ms Flaeper. Since
precision is required during
rolling, the rolling head is CNC-
controlled and freely programmable in
all axes of movement, even including
overlap.
Combination machines allow reliable
and effective processing, even for large-
diameter tubes. For smaller tube sizes,
transfluid units are energy-efficient and
are accurately driven by servomotors.
All types of material may be processed.
transfluid Maschinenbau GmbH –
Germany
Fax: +49 2972 9715 11
Email:
Website:
Welder upgrade improves THDI
EFD Induction has announced that its
lower-power Weldac welders will feature
an option for a 12-pulse diode rectifier.
Previously, lower power Weldacs
featured a 6-pulse rectifier. The new
option has been shown to help reduce
typical total harmonic distortion in
current (THDI) from 25-30 per cent to
approximately 11 per cent.
The issue of harmonic distortion, or
‘harmonics’ as it is commonly called, is
a growing cause of concern for power
utilities and power systems managers.
The proliferation of non-linear loads
causes disturbances that impair
equipment performance and affect total
voltage supply.
The new 12-pulse diode rectifier
is available up to 550kW. An
autotransformer can be supplied if
required, and an additional small
external harmonic filter can also be
installed in order to meet guidelines
set by the Institute of Electrical and
Electronics Engineers.
EFD Induction solid-state Weldac
welders offer high total efficiency
measured from the mains inlet to the
weld coil. This efficiency, together with
the new 12-pulse diode rectifier, helps
minimise power and cooling-water
consumption.
The new 12-pulse diode rectifier is
available in single cabinet Weldacs
with power outputs up to 550kW. EFD
Induction’s high-power Weldac systems
already offer the option of a 12-pulse
rectifier.
EFD Induction AS – Norway
Fax: +47 3550 6010
Email:
Website:
EFD Induction’s smaller solid-state Weldac
welders now have the option of a 12-pulse
diode rectifier
Ball heads swaged
using transfluid
forming technology
The transfluid ‘t form’ combination machine
REB 645-5 SRM 622