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Dec. 17, 1946.
J, KELLER
‘
2,412,813
DEVICE FOR MANUFACTURING THIN-WALLED CONTAINERS OPEN 'AT ONE END ‘
Filed Aug. 31, 1944
‘
‘
A
B.
l
C
f,
D
_
4
00/0 33°
= 7‘/.?6
INVENTORJ
,
Jakob Keller
Patented Dec. 17, 1946
‘
“2,412,813
UNITED‘ STATES PATENT. OFFI‘C
2,412,813
'
.
h
l
'
DEVICE FOR MANUFACTURING THIN
gl’éilglLED CONTAINERS OPEN AT ONE 1 ‘
Jakob Keller, Zurich, Switzerland
Application August‘31, 1944, Serial No. 552,019
‘
In Switzerland May 3, 1944
2 Claims.
byContainers
deep
(Cl. 113—49)
2
open at one end are already made
die C is separated from the first ring B by dis
are cylindrical in shape is a circular
tance-ring f. and the interval between them is
tin disc, which is drawn by a draw-punch through
such that the upper edge of the can, whose depth
is now b, is still engaged in ring B, when its bot
tom already penetrates into ring C. The depth
of the can-previouslyequal to b—-is in the same
way increased by its passage through ring C to c.
In like manner the action of the third ring die
a manner that the thickness of the walls is re
duced while the container is drawn
out by a single
puncheon.
,
This process can be successfully exploited for
D draws the depth 01’ the can from c to d. The
materials with a high degree of toughness, while 10 thickness of the two distance-rings f and f’ sel?
arating ring dies B,‘ C
the manufacture of containers open at one end
and D. is determined by '
the increment‘of the depth of the can, which is .
in turn proportionate to the decrease of the thick
ness of its walls caused by each drawing process.
process instead of the cold-draw 15 In Fig. 2 die A, ring dies B, C and D, as well as’
ing process for aluminium containers. None of
distance rings f and f’ and stripping-ring a.
the devices and procedures proposed offers, how
are combined in holder h to form the deep-draw
ever, the possibility of manufacturing in a single
ing tool which is the object of the invention.
operation containers with walls only a few tenths
At the instant the container enters the ?rst
of a millimetre thick. This will be easily under 20 ring dies, the material to be formed has the same .
stood if it is realised that in deep drawing the
speed as the punch. It can be demonstrated
forming stresses must be taken up by
mathematically that when leaving the ring the
itself, and in
tin retains the speed of the punch, but that the
a millimetre thick cannot be obtained.
The invention hereafter described solves the 25
30
35
the container on entering the next ring.
In the accompanying drawing, Fig. 1 depicts 40
the arrangement of
the single ring dies, while
Fig. 2 is a cross-section of an example of the de
unnecessarily increased.
vice with three ring dies. The following is a de
After its passage through the first ring die.
scription of the invention in greater detail in 45 the depth of the container is increased in pro
relation to the drawing.
a
portion to the reduction of the thickness of its
Punch 8, which is precisely cylindrical, forms
walls. If it is now allowed to enter the second
with die A and rim~holder a a drawing tool,
which does not differ from the tools of this type
already in use. It follows that can E, with a
50
depth equal to a, is produced in the usual way.
leaving the ?rst‘ ring collides with that ?owing
Before its open end leaves the drawing surface
of die A, can E (whose depth is a) is carried by
back; again breakage is unavoidable. In conse
quence the interval must be such that the con
punch S into ring die B which draws the wall of
the can to a depth equal to b. The second ring 55 tainer enters the second ring die only when the
/
work of the ?rst ring die is almost terminated.
2,412,813
.
3
ium can be shaped under the effect of this strain,
have the useful function of loosening the wall
of the can from the punch.
'
not only with exceptional ease, but also v very
'
uniformly. f
‘- More important than thisfloo'sening] action, is,
however, theyg'uiding in the second ring die.‘ The
purpose of the process to which the invention
evenv negligible, ‘deformations.
‘On the
small as possible. 'A limited degree of overlap
ping of successive operations offers the further
advantage of a process smooth and free from
shocks; and it is obvious that, owing to the thin
ness of the container’s walls, even‘ slight shocks
'
_'
.
‘
Thorough experiments have proved that‘the
containers open at one‘ end, in which the raw
material is drawn in the usual manner by a sin
isstillwithin the upper part of the deep-draw—
ing die, and that the successive ring dies are ar
20 ranged at intervals from each other equal to at
best results are obtained with a pressure arising
through an interval between the rings v10%
smaller than the corresponding, depth of the can.
Particularly favourable ‘results have been
achieved in the manufactureofaluminium cans.
This is most probably due to the fact that in the _
process to which the invention relates shaping is "
e?‘ected simply by the strain caused-by-the re
‘
gle punch‘first through a, deep-drawing die and
then through a. series o? ring dies, all of the ring
dies being of uniform internal diameter, said de
vice characterised in that the first ring die is so
?tted that the container, on entering this ring,
terest that the stroke of the punch should be as
v
y
10 ' 1. ‘A device for manufacturing thin-walled
other 7
hand, vto increase the working speed, it is of in
result in breakage.
I
Essential for the success of the process isalso
‘the pro?le oi the, ring dies. Repeated experi- >
ments have proved that the best results are
achieved. with a lateral angle of 10:3".
’
relates is'the manufacture ,orcontainers with
vwalls a few tenthsof aimillimetrenv thick. The
centering tolerance- is, in consequence, of the
order of 1/100 Imm., i'.. e. of the orderoffsr'nall, and
4
ciprocal action of ring and punch; and alumin
.
The slight pressure that still occurs will then
least 90% of the depth of the container at the en- ‘
trance to the next ring.
, 2, A device according to claim 1,'_characterised
in that the ring dies have a lateral angle of 10:3?
?aring outwardly from their bottom to their top
surfaces.
-'
-
‘
JAKOB KELLER.
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