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vec- 31, 1946-
Filed March 24, 1943
a” 40
. /0.
Patented Dec. 31, 1946
Louis H. Morin, Bronx, N. Y., assignor of one
half to Davis Marinsky, Bronx, N. Y.
Application March 24, 1943, Serial No. 480,289
2 Claims. (Cl. 76-107)
This invention relates to the art of producing,
or what might be better said to be re-producing
or duplicating dies. More particularly, the inven
tion relates to the re-production of dies used»
in the art of forming die castings.
In the construction of dies, and particularly
dies having relatively small and complicated im
pressions or cavities, it has been a di?icult and
Fig. 5 is a section on the line 5-—5 of Fig. 3.
Fig. 6 is a sectional view diagrammatically
illustrating the step of forminga die cast mold.
Fig. 7 is a sectional detailed view of the trimmed
5 mold detached.
Fig. 8 is a diagrammatic view illustrating the
' step of forming a die from the mold of Fig. 7,
by powder metallurgy process.
Fig. 9 is a sectional view, showing the result
expensive procedure to produce such dies, par
ticularly when large numbers of the individual 10 ing powdered metal die with the mold thereon,
dies are required on numerous machines in car
ing for large production of the articles in question.
Fig. 10 ‘shows the resulting powdered metal die
after the sintering operation.
One example of such extensive uses is the forma
In describing oneadaptation of my invention,
tion of links or scoops of separable fastener
stringers as is later speci?cally described for 15 I will illustrate dies as employed in forming die
cast links or scoops, such as indicated at H,
illustrative purposes.
Fig. 2 of the drawing, upon the beaded edge [2
Many machines are employed in productions
of a stringer tape l3. These articles of manu
of this kind, and each machine requires its in
dividual die. Furthermore, there is the question
facture are referred to as separable fasteners,
of establishing production of identical parts or 20 and sometimes identi?ed as zippers. The links
or scoops II are arranged at spaced intervals
members, and notwithstanding the accuracy em
ployed in the normal process of duplicating dies,
along the beaded edge l2, and the number of
scoops employed will de?ne what is termed
there is bound to be some slight differentials.
It is the purpose of my invention to effect
stringer lengths.
simplicity and economy in the production of du 25 The links or scoops in the construction shown
.are of what I term double action links or scoops,
plicate dies of the kind under consideration, while
that is to say, each side surface l4, I5 is of the
at the same time establishing a more accurate
production of identical parts, notwithstanding
same construction, having male coupling portions
I6, female coupling portions l1, projecting knobs
the number of machine units employing indi
la in the recesses or portions l‘! adapted to en
vidual dies for the production of the products.
gage apertures or recesses l9 in the portions l6.
It will also appear that a great saving in time
will be effected by my improved process.
At this time it is well to point out that in
It is a further object to take advantage of
producing a product such as ‘the link or scoop
the art of powder metallurgy and to provide an
II where both sides are identical, then the two
improved process of making dies from powdered 35 die halves employed for forming these die cast
ings would be identical. However, there are many
Other objects and advantages will hereinafter
articles of manufacture which would have dif
ferent contours at opposed, surfaces which would
The invention will be de?ned in the claims
necessitate the construction of independent die
and illustrated by the following description taken 40 parts, that is to say, die parts in which the im
pression or cavity of one would be di?erent from
together with the accompanying drawing in which
that of the other. For example, this would also
certain embodiments of the invention are dis
be true in forming links or scoops which have been
closed, and in which the separate parts are desig
in common use, having a male part only of one
nated by suitable reference characters in each
45 side, and a female part vonly of the other side.
of the views, and in which:
Here, left and right die parts would be necessary.
Fig. 1 is a diagrammatic cross sectional View
In that the process which is later described
through a pair of dies used in the formation of
links or scoops on a stringer tape in forming sep
will apply to the construction of both die parts
arable fasteners.
' '
of a complete die, it is essential to deal with the
Fig. 2 is a perspective view illustrating one 50 construction of one die part only.
In Figs. 1 to 5 inclusive is illustrated the dies
link at the beaded edge of a tape, showing the
result of a casting formed as indicated in Fig. 1.
employed for producing the links or scoops II.
Fig. 3 is a face view of one of the die parts
In Fig. 1, two similar the parts are indicated at
’ shown in Fig. 1.
20, and are shown in abutting relationship to each
Fig. 4 is a section on the line 4—4 of Fig. 3.
55 other with a .cast link ll formed in the cavity or
impression 2| of these die parts. The casting
material enters the cavities or impressions
through a gate passage 22 from an injection noz
zle, a part of which is indicated at 23. At _24
is shown a core pin arranged on the parting line
the resulting mold for producing the powdered
metal die 4|. The procedure is generally as fol
When the plunger 39 with the templet 38 there
on is in raised position a measured quantity of
powdered metal is inserted in the chamber de
of the die parts 20, and which forms the aperture
l9 in the resulting casting, link or scoop.
Considering Fig. 3 of the drawing it will appear
?ned by the walls of the housing 40 and the ejec
tor 42, then the plunger 39 including the templet
that the surface of the die part 20 has recesses 25
opening into the cavity 2| for the reception of the
38 are moved downwardly in the bore of the 7
housing 40 under a high pressure, producing a
core pin | 9.
substantially solid homogeneous mass of pow
dered metal which results in the die 4| . The
This surface also has recesses 26
for the reception of the beaded edge I 2 of the
stringer tape l3. Bordering the cavity as well as
the recesses 25, 26 are raised walls 21, 28 which
de?ne relatively sharp edges of contact between 15
both die parts 20, and also ?rm engagement with
the tape l3. The edges as at 28 are cut lower
to provide the necessary clearance for the tape
thickness. This construction insures the forma
tion of castings having no flare of metal, and this v20
is desirable particularly when the castings are
formed upon a mounting tape.
It will also be apparent from Fig. 3 of the
drawing that recesses 29 are employed to form
the resulting knobs | 8 on the ?nished casting.
The surfaces 30 are milled from the face of the
die part in forming the raised relatively thin
boundary walls 21-28. It is the milling opera
tions necessary to produce the surfaces 30 that
materially complicate the formation of dies of
the kind under consideration, particularly in the
formation of small castings where in some in
stances the complete length of the casting is only.
small fractions of an inch, for example 1% of an
Having made what might be termed a master
die, and having produced die castings therefrom,
ejector plunger 42 is then operated to eject the
casting 4| after the plunger 39 and templet 38
have been withdrawn from the housing or cylin
der 40. The die 4| is then sintered and hardened
in producing the ?nal product, and where re
quired, may be polished as is the customary
Instead of proceeding as above, the templet 38
may be unattached or freely detachable with
respect to the plunger 39 and retained in contact
with the die 4|, particularly when it is desirable
to ship or handle the die 4| to any great extent
prior to the sintering thereof. The die 4| in
cluding the templet 38 is then placed in a heater
to sinter the die 4|. The lower melting point of
the templet 38 will result in the melting of this
templet, leaving the resulting sintered die 4|,
which is then‘ hardened. Where the surfaces
and con?guration of the die 4| are very ?ne, this
latter process would be desirable to insure against
any possible breakage or other destruction to the
impression surfaces of the die 4| prior to the sin
tering and hardening thereof.
In accordance with my process, the mold or
templet 38 can also be formed by employing pow
such as the castings II, and having found that
der metallurgy technique, l. e., by simply placing
these castings meet all speci?cation require
the original or master die to be re-produced in a
ments, re-productions of these master dies can 40 press in the manner indicated in Fig. 8 of the
_ be produced as more fully hereinafter set forth.
drawing, in which case 4| would represent the
In one procedure I take a die part 20 and ?x
original die, and 38 would then represent a pow
edly mount it on a suitable backing 3| to form
dered metal templet die formed from the im
what I will term a mold part in order to distin
. pression surface of the primary die. This pow
guish it from the die parts 20. It will be under 45 dered metal die is then sintered and hardened
stood that the cavity or impression 2| of the die
and used as the templet die in producing the du
part 20 forms one part of the mold cavity, the
plicate dies 4|. In this case, a permanent tem
other portion 32 of the mold cavity is formed by
plet die would be formed, from which many of
a tubular body 33 in which is a plunger 34.
the re-productions 4| could be formed.
_ The parting line of the two molds is indicated
It will also be understood that in referring to
at 35, and on this parting line is a gate passage
the die cast templet die 38, these dies when com
36 into which casting material from a nozzle, par
posed of certain types of hard casting materials
tiallyshown at 31, is pressure injected into the
may be used for producing a number of duplicate
mold 'in forming the resulting-die casting .38,
die parts therefrom. However, bearing in mind
which would represent a negative or male replica
‘ that the templet .die when bodily removed from
of the die part 20, and this casting I will de?ne
the re-produced powdered metal die"4‘| can be
as a templet or pattern. In forming this die cast
re-melted and re-used for the production of a
ing, di?erent materials can‘ be employed, for ex
new templet die in a simple die casting process,
ample, zinc alloys can be used, and where greater
it is possible to use these die casting templet dies
strength is required, silicon bronze can be em 60 or molds for the production of single powdered
metal dies.
As many of the templets or patterns as may be
It will, of course, be understood that in produc
needed from time to time can be made and used
‘ing the templet or pattern die part that in addi
for producing duplicate die parts 20 or for each
tion to producing what might be technically
part of the die Where the pairs of die parts are of
termed the impression surface or cavity of the
different constructions.
original dies, the boundary surfaces are also pro
One method of procedure will comprise braz
duced. This is also true of the ?nal powdered
ing or otherwise securing the templet 38 to the '
metal die which must constitute an exact replica
-surface»of;..a-plung'er 39, whichoperates in a suit
of the original die surface as is represented in
able cylinder or housing 40, the contour of which 70 Fig. 3 or ‘the drawing.
will correspond generally to the peripheral con
Having fully described my invention, what I
tour of the templet 38. The housing 40 actually
claim as new and desire to secure by Letters Pat
forms part of the mold in which the resulting
ent is:
powdered metal die 4| is formed. At 42 is shown
1. The method of producing duplicate dies em
an ejector plunger 42 which also forms part of
ployed for forming die cast products which com
_ inal die part, then using this templet die part in
forming a. powdered metal die part having an
.2. The method of p oducing- dies by powdered.
prises the steps of ?rst producing a die cast tem
plet die part of the impression surface of an orig
=metallurgy, which comprises first forming a neg- ' >
ative die part of the impression and boundary
. surface of the die part to be produced, then form- ‘
impression surface corresponding to the impres
sion surface of the original die part, then subject
ing the powdered metal die part including the
templet die part to a high temperature to sinter
the powdered metal. die part and melt the templet 10
die part, and then hardening said sintered pow
dered metal die part. '
ing on the negativev die part, by the pressure com
pacting of powdered metal, a powdered metal die ,
part, then sintering and hardening said powdered.
metal die part to form the desired part of the die,
and melting the negative die part from the pow
dered metal die part in the sintering operation.
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