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MIL=T-16398(MU)
. .. ----
stalled and are not weakened by.excessive which shall not
, ..
change
during
the
hardening
use of screws and dowel pins. Sections lack-
process, beyond the allowable limits. Decar-
burization shall be avoided and all working or
ing adequate support backing or condition
that would weaken the die should be avoided.
wearing surfaces shall be stoned or polished.
.
.
.- ,
.
3.2.1 Type IV die casting dies - Grade A 3.2.5 Type V molding dies (for plastic and
rubber
parts.)
and B.
,.
.
.
L..
.
Strength to. .resist
splitting. The hob shall
.. ....
hdiketAelmy*a~i=y":`:""
Inserts. To facilitate maintenance,
3.2.1.2.1.
inserts may be used provided they have
suf~~cient reinforcement and are locked in
place to prevent any movement detrimental
to the die. Inserts may also be used to over-
come complicated heat treating conditions
They should not be used where their applica-
tion would be detrimental to the die. , `
3.2.4.2.2 Sections. To facilitate mainte-
nance, accuracy, and machineability, sections
may be used provided they are properly in-
stalled, and are not weakened by excessive
use of SCrewS and dowel pins. Sections lack-
ing adequate support, backing, or Conditions
die should be avoided. treating conditions. they should not be used
that would weaken the
`
where their application w o u l d
be
detrimental
3.2.4.2.3 Vents. Vent size shall be sufficient
to
the
die.
to allow proper venting but shall not be
excessive to the extent that heavy flashes
would result in excessive deburring opera-
tions.
..
.
q
3.2.1.2.4 Ejector. The ejector shall be the
mechanical type. The activation of the ejector
shall be optional, either air, hydraulic, or
,
mechanical.
....
3.2.4.2.5 Alignment. The alignment of the
die shall be maintained to prevent shift or
pushover while under working pressure.
cessive to the extent that heavy flashes would
3.2.4.2.6 Finish. To insure accuracy and to result in an excessive deburring operation.
eiiminate soft skin due to decarburization in
3.2.5.2.4 Ejector. The ejector shall be the
hardening. all cavities and guides shall have mechanical type. The activation of the ejec-
a No. 16 RMS or better. Where grinding is tor shrill be optional; air, hydraulic or
not practical the steel used shall be of a type mechanical.
.
6
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