20
5.3 Casting with premelting
Is recommended if muffle cooling is leading to insufficiently outflown castings.
1-14. preparational jobs
⋅ see chapter 5.1 „Start here…“
15. Close chambers
Don’t swivel lock lever upwards (vertically)
and don’t press in direction to the device.
16. Preheating metal
⋅ Turn step switch to „1“, turn rotary switch from „0“ to
"max=10" – LED’s yellow and green are "ON".
Watch procedure through sight glass.
17. Take muffle off the preheating
furnace and place it in the center of
the muffle chamber
⋅ When the red lamp shines (2) swivel open muffle
chamber (7) (heat output is reduced)
⋅ Take muffle off the preheating furnace and place it in the
center of the muffle chamber (7).
⋅ Support plate must be clean
(Insert insulating and centering tool before, chap. 5.1)
18. Close muffle chamber (7)
⋅ Muffle may not shift, close chamber as far as it will go
⋅ swivel locking lever upwards (vertical)
and press on in direction to the machine.
19. Continue melting
⋅ Watch this process until the set temperature is reached
and take care of timely casting.
⋅ Additionally it’s possible at any time to reduce
performance with the Argon key and Argon rinsing,
however only up to max. 150° C before reaching casting
temperature
⋅ When casting a full vacuum must be reached!
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