TPT March 2011

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March 2011 63 ›
Technology Update
Induction
heating
GH Induction Atmospheres has introduced
a new series of 13 induction heating power
supplies with a wide frequency range
for increased flexibility. The SM Type
Transithermic® power supplies cover 0.5
to 20kHz with 100 to 800kW output power;
100kW output is available over the extended
frequency range of 20 to 150kHz.
With up to 90% efficiency, high reliability,
and easy-to-use digital control, the SM Type
power supplies are suitable for both new
installations and existing systems. “With
the flexibility provided by the extended
operating range, SM Type power supplies
will be quite popular as replacement power
sources for many existing industrial heat
treating machines,” commented GH IA
general manager Steve Skewes.
The power supplies feature a modular
design with plug-in power control cards.
They utilise IGBT transistors and include
a DCP (digital control panel) with built-
in diagnostics and optional kW/sec
monitoring. A series oscillating circuit offers
high efficiency and easy load matching. GH
Transithermic power supplies can operate
at variable frequencies; the frequency is
automatically coupled to the load in every
application, within a wide range.
GH Electrotermia SA – Spain
Fax: +34 961 352 171
Email:
Website:
Spinform
axis tube
end profiles
HESS Industries, Inc, USA, offers spinforming
machines that produce eccentric and oblique
tube end forms. This process consists of
a clamped work piece and a rotating head
containing forming rolls. To form a reduced
end profile that is offset or eccentric from
the tube’s central axis, the clamp moves the
workpiece towards the offset axis while the
forming rolls reduce the end diameter.
The same method is used to produce
an end profile that is at an oblique angle by
driving the clamped work piece while the
forming rolls move radially toward the planned
oblique axis. Typical applications include
automotive and truck exhaust components
and catalytic converters where space is
limited or restricted. Typical tube spinforming
follows the centreline of the tube.
The spinforming process allows substrates
such as gas, liquid or power filtration
elements to be inserted in the tube and the
end forms are spun down to attach to the
flow tube. Spinforming eliminates the need to
stamp and weld end forms reducing tooling
and manufacturing cost while enhancing
part quality. Tube spinforming technologies
are currently being used in the automotive,
HVAC, filtration, marine and other industries.
Hess also provides machine process
development and prototyping services
operations in the USA, Europe, China and
India.
Hess Industries – USA
Fax: +1 269 683 1775
Email:
Website: