18
5.2 Casting without metal premelting
1-14. perform preparational jobs
⋅ see chap. 5.1 „Start here…“
15. Take muffle off the preheating
furnace and insert in the middle
of the muffle chamber
⋅ Support plate has to be clean
(Insert Insulating- and centering tool before, chap. 5.1)
16. Close muffle chamber (7)
⋅ Muffle may not shift, close chamber as far as it will go
17. Tighten chambers
⋅ Swivel locking lever upwards (vertical)
and press on in direction to the machine.
18. Melting
⋅ Turn multiple-contact switch to „1“, turn rotary switch
from „0“ to "max=10" - LED yellow and green are "ON"
and vacuum starts automatically
⋅ Argon rinsing: 450°C before casting performance is
automatically reduced and Argon is added.
So a more precise temperature measurement
is granted and the casting result is positively influenced
(Oxide reduction, more silent melting. Evacuation stops
until it is reactivated in the following chapter.
⋅ Additionally it’s possible to obtain the same performance
reduction and Argon rising at any time by pressing the
Argon key.
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