Amann Girrbach girocrom fh Instructions D'utilisation page 23

P RO C E SS ST EP S IN T H E DE N T AL L AB O R AT O RY
For vacuum pressure-casting machines:
▷ Melt-up alloy without vacuum.
Set the model casting program and switch off the vacuum
or reduce it as far as possible.
▷ Place Girocrom FH casting cylinder in a ceramic melting pot (1 cube
~ 6 g).
▷ When the last casting cylinder has joined the molten material and
the molten material tears apart, draw off immediately.
▷ After the casting, allow the investment ring to slowly cool in the air.
Divesting / Finishing
▷ Blast off frame with 110 – 250 μm aluminium oxide.
▷ Blast off critical, delicate areas with 50 μm aluminium oxide.
▷ Cut off the casting channels with a cutting disc.
▷ Work out frame using carbide bur (cross-toothed) or ceramic-
bonded stone.
▷ Polish frame.
Laser welding
▷ Blast off and clean the spot to be welded (using 110 - 250 μm pure
aluminium oxide).
▷ Prepare connecting location in the form of a modified X seam.
▷ Use CoCr laser welding wire (721130 ff) as core-up material.
Soldering
▷ Solder using CoCrMo filler and the corresponding flux.
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