Franz Niedermair, Hertwich Engineering GmbH, Braunau, Austria
Continuous vs. Batch in an Integrated Modern Casthouse
Track: BILLET PROCESS & EQUIPMENT - Homogenization
ABSTRACT—Continuous homogenizing for extrusion billets has become the accepted standard
and state-of-the-art technology. HE has to date built more than 120 such plants worldwide, which are
processing some two-thirds of the worldwide extrusion billet production. Batch type homogenizing is
still the best suited technology for various alloys which require long holding times, e.g. 4 to 12 hours,
as well as for large-only log diameter production. Again, HE has in recent years supplied several batch
homogenizing plants. Some of these plants have been integrated with a continuous furnace for
optimum billet processing. Topics include: process technology, heating, holding, different types of
coolers; new log support saddle design, exit car, no rolling of logs with focus to good billet surface
finish; automated sawing, packing; high-efficiency batch furnace and cooler with reversing air and
precise temperature regime; integrated continuous/batch homogenizing system for processing a full
spectrum of extrusion billets or varying diameters and alloys.
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