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Патент USA US3040894

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June 26, 1962
w. HAENDELER
3,040,834
COOLING 0F EXTRUDED PRODUCTS
Filed May 13, 1959
2 Sheets-Sheet 1
FIG. 1
nvvewroe
June 26, 1962
w. HAENDELER
3,040,884
COOLING OF EXTRUDED PRODUCTS
Filed May 15, 1959
2 Sheets-Sheet 2
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United States Patent 0 "Ice
1
1
3,d4d,834
Patented June 26, 19562
2
3,040,834
Walter Haendeler, Dusseldorf, Germany, assignor to
Schloemann Aktiengesellschaft, Dusseldorf, Germany
COOLING OF EXTRUDED PRODUCTS
foundation. From each side a container 4 is pressed,
likewise in a known manner, by means not shown,
against the press head 2. Each container 4 has a sleeve
6, which is intended for the reception of the heated metal
billet, of aluminum for example. In each sleeve there
Filed May 13, 1959, Ser. No. 812,894
Claims priority, application Germany May 20, 1958
4 Claims. (Cl. 207-16)
is a press disc 8, which can be forced towards the press
head 2 by a press ram 10. The ram 10‘ is actuated in
When extruding a sheath on to an insulated electric
a manner known in itself, preferably by hydraulic means,
namely by a stationary cylinder, in which there moves
cable, for example, in order to obviate injury to the
cable insulation resulting from the action of the heat
a piston, which actuates the ram 10. The press head 2
has in its longitudinal direction a bore, which is differ
of the sheath, particularly in the case of an aluminum
entially constructed.
It accommodates at one end a
sheath, that is being applied to the cable core, the cable
screw member 12, which screws into the press head 2 by
sheath is cooled by spraying water on to it. On the other
means of a thread 13, and presses an annular ?ange of
hand, a cooling down of the die, and of the material in 15 the mandrel-holder 14 against a shoulder 15. The
the extrusion chamber, must be avoided, in order, by a
mandrel-holder 14 carries a mandrel 16-. From the other
uniform flow of the metal, to obtain a cable sheath with
end a screw member *18 screws into the press head 2
a smooth and satisfactory surface.
The object of the invention is to provide a method
of cooling which will prevent a back-wash of the cooling
water sprayed on to the cable sheath, and will thus
obviate any cooling of the die and of the extrusion ma
a die-holder 22, which carries the die 24, against a
shoulder 23. The mandrel 16 and the die 24 are there
fore held ?rmly in the press head 2.
terial by the cooling water.
According to the invention a current of air, in the
direction of the issuing material, is directed on to the
mandrel holder 14 into the longitudinal bore in the head
"2. It becomes sheathed with aluminum in the gap be
by means of a thread 19. The screw member 18 presses
From one end a cable 26 is introduced through the
tween the mandrel 16 and the die 24, so that a sheath
2i‘, is formed. The two press discs 8 are at the same
water that is being sprayed on to the cable sheath. Any
back-wash of the water is thereby prevented, and the
time being moved forwards, so that the extrusion ma
die and the extrusion material are protected from an
terial 30, which is distinguished by cross-hatching in the
drawings, is forced through passages 31 in the press
head 2 and through the so-called extrusion chamber 32,
undesirable cooling.
For carrying out the method according to the inven
tion the cable sheath is surrounded with a double tube,
to form the sheath 28.
Into the screw member 18 and the die-holder 22 is
inserted a tubular jacket or double tube 34, 35, which
forms, with the internal wall surface of the screw mem—
known in itself, conveying the cooling water, which sprays
the water on to the cable sheath obliquely in jet form in
the direction of the issuing extruded product, and a
path is provided for the access of air, which allows atmos 35 ber 18, an annular space 36, which is in communication
pheric air to pass between the tip of the double tube and
with the outer air.
the die.
To the interior 38 of the tubular jacket or double tube
The jets of water spraying obliquely on to the cable
34, 35, that is, the annular space between the inner and
sheath drag air along with them, and therefore produce
outer tubular elements 34 and 35, a water inlet pipe 39
a current of air in the direction of the issuing cable. 40 is connected. The water entering this annular space 38
This air current, which of course can only occur when
is sprayed from nozzles 40 in an oblique direction on
a path of access is provided for the air, draws along with
to the cable sheath 23 that has just been formed. The
it, in the direction of motion of the cable, that part of
bulk of the water thus flows in the extrusion direction.
the sprayed water that tends, owing to ‘back-wash, to
Individual drops are however held back, and tend to be
?ow in the direction opposite to that of the cable, and 45 sprayed back through the narrow passage 41 towards
in this way the water is kept away from the die. In
the die 24. In order to obviate this, conduits 42 ma
particular, for this purpose, a larger number of spraying
chined in the die-holder 22 and in the die 24 are con
nozzles is provided and a larger quantity of water is
nected to the annular space 36 outside the double tube.
sprayed than is necessary for the cooling of the cable
From six to ten such passages may be provided. The
sheath itself. The greater quantity of water sprayed is
water sprayed out of the nozzles 40‘ draws along with
intended to serve merely for increasing the flow of air
it the air located in the annular passage 43, so that in the
that opposes a re?ux of water towards the die. It is
narrow passage 41 between the tip of the double tube
however also possible to admit the current of air directly
34, 35 and the cable sheath 28 there is a powerful draught
from the exterior under pressure.
of air, which prevents the spraying back of individual
It is further proposed to preheat the external air, up
drops of water. The breadth of this narrow passage is
to 100° or 200° C. for example. The double tube is
less than half the distance between the inner tube 34 and
preferably caused to bear with a conically tapering tip
the cable sheath 28 in the region of the uppermost nozzles
against the correspondingly shaped die and die-holder,
40. The narrower the passage 41, the greater is the
and ducts for the supply of air are provided either in
draught therein, and therefore the more surely is the
the external surface of the double tube or in the die 60 water kept away from the die 24. In the drawing, FIG
and the die-holder. In most cases it is su?icient if the
URE l, the space 36 is closed at the lower end. Into
aggregate breadth of all the ducts amounts to about
it opens a pipe 44, to which compressed air is supplied
from 1A to 1/10 of the periphery of the tube, but it may
from a pipe 45 through an air-heater 46, in which an
be even greater.
electrical heating coil 47 is provided.
One constructional example of the invention is illus 65 The double tube 34, 35 is pressed into the die-holder
trated in the accompanying drawings, in which:
22 by three springs 48 distributed around the periphery,
FIGURE 1 shows in horizontal section the main mem
bers of a hydraulic press; while
so that even when changes of temperature of the in
dividual parts occur, it always bears ?rmly against the
FIGURE 2 shows on a larger scale a longitudinal sec
tion through the cooling means of the press head.
The actual press head 2 of ‘the press is stationarily
supported, in a manner known in itself, upon a machine
70
die-holder 22.
I claim:
1. A press for extruding an aluminum sheath around
a cable, comprising heat sensitive material, including; a
spa-dean:
press head having an extrusion chamber in it, a hollow
mandrel mounted in said head, a die mounted in said
through said mandrel, passage means leading from said
extrusion chamber to said extrusion gap, a pressing means
head coaxially with said mandrel so as to leave a cir
for extruding metal from said extrusion chamber through
cular extrusion gap for the extrusion of an aluminum
sheath around a cable being passed through said man
drel, passage means leading from said extrusion chamber
the out?ow side of said die, an externally screw threaded
member held in a boring in said extension, said threaded
said extrusion gap, an extension on said press head on
die, said elongated recess having a tapering part adjacent
to, and tapering towards, said die, a tubular jacket inside
said elongated recess, the bore of said‘ tubular jacket being
an extension on said press head on the out?ow side of
said die, said extension having an elongated recess in it 10 generally coaxial with said die, and one correspondingly
tapered end part of said jacket lying in said tapering part
coaxial with said die, said elongated recess having a
of said elongated recess, the non-tapering outer surface
tapering part adjacent to, and tapering towards, said die,
of said jacket being held in spaced relationship with the
a tubular jacket inside said elongated recess, the bore
inner surface of said elongated recess so as to delimit a
of said tubular jacket being generally coaxial with said
to said extrusion gap, pressing means extruding metal
‘from said extrusion chamber through said extrusion gap,
die, and one correspondingly tapered end part of said 15 duct of annular cross section which is connected to a
jacket lying in said tapered part of said elongated recess,
the non-tapering outer surface of said jacket being held
in spaced relationship with the inner surface of said
plurality of discharge ducts between the tapering part of
elongated recess so as to delimit a duct which is con
said bore, with the surface of said die, and with said duct
said jacket and the adjacent inner tapering surface of said
elongated recess, said discharge ducts communicating with
ected to a plurality of discharge ducts between the
of annular cross section so as to provide a passage from
tapering part of said jacket and the adjacent inner taper
ing surface of said elongated recess, said discharge duct
communicating. with said bore, with the surface of said
the latter to said die leading into said bore, a plurality of
ori?ces in said jacket from its interior directed obliquely
towards the axis of said jacket in a direction away from
said die, and a liquid supply duct communicating with
die, and with said duct so as to provide a passage from
the latter to said die leading into said bore, a plurality 25 said interior of said jacket, whereby liquid sprayed on to
said sheath can be prevented from contacting said die by
of ori?ces in said jacket vfrom its interior directed oblique
gas blown through said discharge ducts.
ly towards said sheath near said die in a direction away
4. A press for extruding an aluminum sheath around
from the latter, and a liquid supply duct communicating
a cable comprising heat sensitive material, including; a
with said interior of said jacket whereby liquid sprayed
on to said sheath through said ori?ces can be prevented 30 press head, an extrusion chamber in said head, a hollow
mandrel ?xedly mounted in said head, a die mounted
from contacting said die by gas passed through said dis
?xedly in said head coaxially with said mandrel so as to
charge ducts.
leave a circular extrusion gap for extrusion of aluminum
2. A press for extruding an aluminum sheath around a
cable comprising heat sensitive material, including; a
sheath around a cable being passed through said mandrel,
press head having an extrusion chamber in it, a hollow 35 a passage leading from said extrusion chamber to said ex
trusion gap, a pressing means for extruding metal from
mandrel mounted in said head, a die mounted in said
said extrusion chamber through said extrusion gap, an
head coaxial with said mandrel so as to leave a circular
extension on said press head on the outflow side of said
extrusion gap for the extrusion of an aluminum sheath
die, said extrusion having an elongated recess in it co~
around a cable being passed through said mandrel, a
passage means leading from said extrusion chamber to 40 axial with said die, said elongated recess having a taper
ing part adjacent to, and tapering towards, said die, a
said‘ extrusion gap, a pressing means for extruding metal
from said extrusion chamber through said extrusion gap,
tubular jacket inside said elongated recess, the bore of
an extension on said press head on the out?ow side of
said tubular jacket being generally coaxial with said die,
and one correspondingly tapered end part of said jacket
said die, said extension having an elongated recess in it
coaxial with said die, said elongated recess having a 4:5 lying in said tapering part of said elongated recess, the
non-tapering outer surface of said jacket being held in
tapering part adjacent to, and tapering towards said die,
spaced relationship with the inner surface of said elon
a tubular jacket inside said elongated recess, the bore
of said tubular jacket being generally coaxial with said
die, and one correspondingly tapered end part of said
jacket lying. in said tapering part of said elongated recess,
the non-tapering outer surface of said jacket being held
in spaced relationship with the inner surface of said elon
which is connected to a plurality of discharge ducts be
tween the tapering part of said jacket and the adjacent
inner tapering surface of said elongated recess, said dis
gated recess so as to delimit a duct which is connected
in the surface of said die, and with said duct of annular
gated recess so as to delimit a duct of angular cross section
charge ducts communicating with said bore, with channels
to a plurality of discharge ducts between the tapering
cross section so as to provide a passage from the latter
part of said jacket and the adjacent inner tapering sur 55 to said die leading into said bore, a plurality of ori?ces
face of said elongated recess, said discharge ducts com
in said jacket from its interior directed obliquely towards
municating with said bore, with the surface of said die,
the axis of said jacket in a direction away from said die,
and with said duct so as to provide a passage from the
and a liquid supply duct communicating with said interior
latter to said die leading into said bore, a plurality of
of said jacket whereby liquid sprayed on to said sheath
ori?ces in said jacket from its interior directed obliquely 60 can be prevented from contacting said die by gas blown
towards the axis of said jacket in ‘a direction away from
through said discharge. ducts.
said die, a pipe directed into said duct of annular cross
References Cited in the ?le of this patent
section from its end furthest ‘from said die for blowing
UNITED STATES PATENTS
cooling gas into it, and a liquid supply duct communi
cating with said interior of said jacket, whereby liquid 65
tacting said die by gas passed through said discharge
408,377
867,658
1,741,815
ducts.
3. A press for extruding an aluminum sheath around
1,983,761
Jacobson _____________ _._ Dec. 11, 1934
2,050,873
Zickrick ______________ __ Aug. 11, 1936
2,863,557
2,975,893’
Munker ______________ __ Dec. 9, 1958
Johnson _____________ __ Mar. 21, 1961
657,959
718,077
Great Britain __________ __ Oct. 3, 1951
Great Britain _________ __ Nov. 10, 1954
sprayed on to said sheath can be prevented from con
a cable comprising heat sensitive insulating material, in
cluding; a press head having an extrusion chamber in it,
a hollow mandrel ?xedly mounted in said head, a die
FOREIGN PATENTS
mounted ?xedly in said head coaxial with said mandrel
so as to leave a circular extrusion gap for the extrusion
of an aluminum sheath around a cable being passed 75
Cobb ________________ __ Aug. 6, 1889
Hoopes et al. _____ _-_____ Oct. 8, 1907
Boynton _____________ _._ Dec. '31, 1929
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