Mold
Release
 Armoloy®
coating is used to protect both metal and plastics molds, even though
the continuous effects of hot metal injected into die-casting molds
represent one of the toughest wear problems. Even the hot work series
of alloy steels (H-13) are not able to stand up continuously to
the effects of the heating and cooling cycles demanded of the mold.
In addition, the use of mold releases can cause a build-up of release
residue on the cavity surface to the point where the mold must be
removed from the press and cleaned and polished. Armoloy® improves
the lasting qualities of the mold on both problems: heat checking
and release build-up.
The
inherently hard Armoloy® surface is corrosion-resistant and lowers
the coefficient of friction between the Armoloy® surface and other
materials which helps reduce galling and pick-up between sliding
metal parts. The satiny-matte, micro-orange peel finish of the Armoloy®
coating tends to also prevent mold release drips and runs on the
cavity surface. Polishing and grinding requirements prior to coating
with Armoloy® are the same as that with standard chrome-plating.
For
thermoset materials, certain alkyds cause considerable maintenance
problems requiring periodic cleaning of mold surfaces and recoating.
Armoloy® coating reduces maintenance requirements and extends
mold life up to ten times that of normal molds without Armoloy®.
Standard
chrome-plating over nitrided surfaces can best be described as sporadic.
Adhesion is definitely a problem and the flash-plating is liable
to peel off. Armoloy® solves this problem with a special cleaning
technique that provides a secure Armoloy® bond to the nitrided surface.
Automatic
unscrewing molds for threaded closures have a wear and galling problem
between the rotating core and stripper ring. Ideally these running
surfaces would be lubricated, but this is not always possible due
to the close proximity to the molding area. Tests indicate that
the sliding coefficient of friction when one surface is Armoloy®
coated is reduced 20 percent; and when both surfaces are Armoloy®
coated, friction is reduced in excess of 40 percent compared to
steel against steel contact. |
