+ Equal filling of the die
+ Controlled heat transfer
+ Good surfaces of the castings
+ Long life time
INTRODUCTION:
Although various aspects of the permanent
mould casting process have been studied
and developed, such as alloy selection,
machine automation, etc., little attention has
been given to the products and methods for
preparing the surfaces of the die.
It is often the operator that selects and
prepares the coating material, and the
final choice is based almost exclusively on
practical experience rather than technical
and theoretical considerations. This manual
aims to provide foundry engineers and
operators involved in die preparation with
the information required for the correct use
of coating materials, in order to optimise
efficiency and so improve foundry production.
This latest revised and illustrated edition of
the Foseco DYCOTE Manual comprises: An
analysis of the functions of coating materials,
preparation and application methods, and
examples of die preparation for the most
common castings.
The tables with the characteristics of
DYCOTE products have been extended,
rationalised and now include a new
family of DYCOTE’s, the DURA group.
This offers extended coating life, to improve
productivity.
Where a special coating is only available in
some countries it has not been included in
the table. Also not every mentioned coating
is available in every country. For more details,
please contact your local Foseco company.
The manual is completed with appendices on
cryogenic sandblasting, coating application
defects and defects in die-cast parts.
FUNCTIONS OF DYCOTE:
1 Control of the metal flow to ensure that it
reaches all parts of the die at a sufficient
temperature to prevent the formation of
seams, cold laps, etc.
2 Control of heat transfer to obtain better
solidification and ensure that the castings
are properly fed.
3 Easy release: since castings are
extracted at just below the solidification
temperature, easy release ensures that
castings do not come out deformed.
4 Good surfaces, and therefore a reduction
in finishing costs.
5 Longer die life, therefore increased
productivity and reduced maintenance.
These results are directly in line with the
characteristics of DYCOTE.
Although various aspects of the permanent
mould casting process have been studied
and developed, such as alloy selection,
machine automation, etc., little attention has
been given to the products and methods for
preparing the surfaces of the die.
It is often the operator that selects and
prepares the coating material, and the
final choice is based almost exclusively on
practical experience rather than technical
and theoretical considerations.
An analysis of the functions of coating materials,
preparation and application methods, and
examples of die preparation for the most
common castings.
The tables with the characteristics of
DYCOTE products have been extended,
rationalised and now include a new
family of DYCOTE’s, the DURA section-grayoup.
This offers extended coating life, to improve
productivity.
WIDE RANGE OF DYCOTE PRODUCTS FOR IMPROVING CASTING FILLING AND SOUNDNESS:
DYCOTE 11 M Paste and Liquid :
Water base graphite dycote for lubrication and cooling of
moving parts
and metallic cores in GDC and LPDC applications.
DYCOTE 140 Paste :
Versatile insulating die cavity coating with moderately textured surface finish.
DYCOTE 14 (ESS) :
Versatile insulating die coating with extra bonding and superior life.
DYCOTE R 87 :
Base or primar dycote.
DYCOTE 34 Paste :
Insulating riser coating.
DYCOTE 34 ESS :
Highly insulating riser coating with superior life.
DYCOTE 34 ESS :
Cavity and metallic core coating for excellent release and best possible surface finish.
DYCOTE 34 ESS :
Medium surface finish, die cavity coating.
SUPERIOR PERFORMANCE LONG LIFE DYCOTE PRODUCTS:
DYCOTE 140 ESS :
Superior insulating die cavity coating with moderately textured surface finish and superior life.
DYCOTE 1400 :
Long life insulating cavity die coating for excellent productivity, with smooth surface finish.
DYCOTE 3900 :
Long life die coating with excellent surface finish and better release.
DYCOTE 3600 :
Long life insulating cavity die coating for excellent surface finish and productivity.
DYCOTE 7029 :
Highly insulating long life riser coating paste for improving feeding of risers in GDC.