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!
