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Патент USA US2110965

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March 15,,193gs‘.’ "
v
F. SINGER
2,110,965
REDUCING THE DIAMETER OF HOLLOW METAL ARTICLES
Filed Feb. 8, 1936
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W/TNEJJEJ
INVENTOR.
2,110,965
Patented Mar. 15, 1938
UNITED I STATES PATENT OFFICE
2,110,965
REDUCING THE DIAMETER 0F HOLLOW
METAL ARTICLES
Fritz'Singer, Nuremberg, Germany, assignor to
'
Tubus A. G., Glarus, Switzerland
Application February 8, 1936, Serial No. 62,986
In Germany July 2, 1934
13 Claims.
(01. 205-4)
This invention relates to a method of reduc
‘ ing the ‘diameter of hollow metal articles such.
for instance, as tubes.
the reduction is interrupted, and thereafter the
cycle‘is repeated with the next succeeding short
To reduce the diameter of tubular articles
desired longitudinal portion of the tube. For
reducing without simultaneous reduction‘of wall
5 without simultaneous reduction of the wall
thickness it has heretofbre been the practice to
draw them through a die ring the diameter of
the bore of which was smaller than the outer
diameter of the tube. For this purpose the ends
10 of the tubes,have to be cold forged to permit
the end of the tube to be passed through the
die ring and so that it can'be gripped by the
drawing tongs. This is disadvantageous because
it adds to the cost of the‘. finished product
15 through the added forging operation and the
Waste which. unavoidably results from the point,
which is useless, except as scrap, when drawing
has been completed. Furthermore, long draw
benches are necessary, occupying much space
20 with consequent overhead burdens arising from
extensive draw-bench equipment and v?oor
space occupied. Another disadvantage is that
lengths of the article to e?ect reduction of a
thickness the tube is drawn freely, i. e., without
a mandrel.
-
In the practice of the invention, therefore, the
tube is supported relative to a die and one is
reciprocated toward the other.
Most suitably
the tube is supported adjacent one end, to pro
vide an extended length not materially greater
than that of the ?rst increment to be reduced,
and the die is advanced, over the end to reduce
that extended portion, as just described. There
after the support point of the tube may be shifted
to provide another extended short length for re
duction by the die.
This cyclic incremental re- ‘ I
duction is repeated to complete reduction of the
20
article.
I now prefer, however, to operate by the
method now to be described.
According to this embodiment a die ring, the
diameter of the bore of which is smaller than
{wit is not ordinarily feasible to provide benches ‘ the outer diameter of the tube to be worked, is
to a large extent the length of tube that can
be drawn is governed by the bench length, and
long enough to treat great lengths of drawing
stock.
'
It is among the" objects of this invention to
provide a method of reducing the diameter of
30 tubes and other hollow metallic articles which
is simple, effective, avoids the necessity for
forming points on the tubes, is applicable to
treatment of long articles, requires only simple
and compact apparatus, and embodies other ad
reciprocated relatively to the tube to be reduced
while the latter is supported rigidly by any suit
able gripping device, whereby a portion of the
tube is reduced in diameter, the die is then re
tracted and the tube or other hollow article is
concurrently released and‘advanced toward the
die ring, either during or after it is returned
to its initial position, thus presenting another
length of the tube to the die which is recipro
cated again relatively to the tube which is again
held rigidly by the gripping device. Thereby a
The accompanying drawing schematically rep
resents various stages of one complete cycle of successive portion of the tube is reduced in
diameter. The cycle is repeated until the en
the preferred embodiment of the method pro
tire tube, or any desired part of the tube, is
vided by the invention. a
'
40
brought to the reduced diameter.
40
In accordance with the invention tubular me
This embodiment is schematically shown in
tallic articles are reduced in diameter by 'de
the accompanying drawing. Fig. 1 is a schematic
?ecting the wall of the article toward its longi
tudinal axis progressively over a relatively short sectional view'of the main partsof the appa
length of the article in a direction toward the ratus in the position after tube I has been in
45 unreduced portion, and repeating such incre-‘ serted in gripping means 2 adapted to hold the
mental reduction along continuously successive tube against longitudinal movement when the
short lengths until the diameter of the entire die is acting on it. The die ring 3, reciprocated
article, or a desired portion thereof, has been by any suitable drive, for instance a crank, not
shown, is shown in its initial position.‘ The
reduced. Most suitably this is effected by die
: 3 vantages that will appear hereinafter.
reduction using a die having a bore less than
gripping mechanism 2 mounted on the machine 50
that of the article and adapted to produce the frame is open so that the tube to be worked
desired reduction. Stated in other words, the can be passed through until it contacts, or is
adjacent, die ring 3. Fig. 2 is a view similar to
article is die-reduced progressively in a direc
tion toward the unreduced portion, and after a Fig. 1 showing the gripping mechanism 2 closed;
55 relatively short length has been thus reduced the die is then advanced to reduce a short length 55
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2
2,110,966
la of the tube, as seen in Fig. 3, in which die
ring 3 has nearly finished its forward stroke
with the gripping device still closed. Fig. .4
shows the parts of the/apparatus and the tube
in the position after the die ring has ?nished its
return stroke, as the, gripping device 2 opens
immediately before or after the die ring has
finished its forward stroke, the tube is carried
on to the left by the die ring by means of the
10 frictional grip of the latter on the tube while
the die ring is executing its back stroke. Imme
diately before the die ring begins a new forward
stroke, gripping mechanism 2 is again closed so
that the die ring will reduce, at its new forward
15 stroke, the diameter of a successive portion of
the tube as shown in Fig. 5.
The intermittent gripping and releasing of the
tubes at the intervals when the die ring changes
the direction of its motion may easily be per
20 formed with well known means.
Besides thesavings obtained by avoiding the
forging of points onto the tubes and the waste
connected therewith,'a further advantage of the
method according to the invention consists in the
25 ability to considerably increase production as
compared with that obtained by the known com
mon drawing process, as the method can be per
formed by using a very high number (e. g., 300
and more) of strokes a minute.
A further advantage of the method according
80
to the invention is that tubes in almost unlimited
bers relative to the other in intermittent steps to
cause die-reduction of successive relatively short
lengths of the article in a direction toward its
unreduced portion, gripping said unreduced por
tion, and continuing such intermittent stepwise
die-reduction to' progressively reduce continu
ously successive lengths of the article, the said
gripping taking effect at a place not far removed
from the place where reduction begins.
4. That method of reducing the diameter of a 10
hollow metal article which comprises the steps
of supporting the article rigidly by gripping it
adjacent an end thereof at an unreduced portion,
advancing a reducing die over said end to there
by'reduce a relatively short length progressively 15
in a direction toward the unreduced portion,
shifting the point of support of the article farther
toward the unreduced portion vto'provide a fur
ther relatively short unreduced length, advanc
ing the die over said further length, and repeat 20
ing such steps to progressively reduce contin
uously successive lengths of the article.
5. That method of reducing the diameter of a
hollow metal article which comprises the steps
25
of ‘supporting the article rigidly at an unre
duced portion adjacent an end thereof by ex
ternal gripping means, advancing a reducing die
over said end to progressively reduce a relatively
short length in a direction toward the unreduced
portion, retracting the die and advancing the 30
tube to provide an unreduced relatively short
lengths can be reduced in diameter on an appa
length ahead of the supported portion, and re- I
ratus of very small length and comparatively
small weight while with the known drawing
peating said steps to progressively reduce con
tinuously successive relatively short lengths of
35
35 process the lengths of the tubes to be reduced the article.
'
6. That method of reducing the diameter of a
are dependent upon the length of the drawing
bench. Moreover, the apparatus necessary for "hollow metal article which-comprises the steps
of supporting the article rigidly adjacent an end
the practice of the invention is small and rela
thereof, advancing a reducing die over said end
tively simple.
to progressively reduce a relatively short length 40
According to the provisions of the patent stat
40
utes,‘I have explained the principle and mode of in a direction toward the unreduced portion,
operation of my invention, and have illustrated retracting the die and using the frictional grip
and described what I now consider to be its best ‘ of the die on the tube for advancing the tube to
provide an unreduced relatively short length
embodiment. However, I desire to have it"un
ahead of the supported portion, and repeating 45
45 derstood that, within the scope of the appended
claims, the invention may be practiced otherwise . said steps to progressively reduce continuously
than as speci?cally illustrated and described.
I claim:
*
1. vThat method of reducing the diameter of a
50 hollow metal article which comprises the steps of
deflecting the wall of the article toward its lon
gitudinal axis progressively over a short length
of the article and in a direction toward the un
reduced portion, gripping said unreduced portion,
55 and repeating such progressive de?ection of the
wall along such short lengths, the said gripping
taking e?ect at a place not far removed from the
place where deflection begins.
2. That method of reducing the diameter of a
60 hollow metal article which comprises the steps of
progressively die-reducing the diameter of the
article over a relatively short length in a direc
tion toward the unreduced portion, gripping said
unreduced portion, interrupting the said die-re
65 duction upon completing reduction of said length,
andrepeating such incremental die-reduction to
reduce continuously successive lengths of the
article, the said gripping taking effect at a. place
not far removed from the place where reduction
70
begins.
'
.
3. That method of reducing the diameter of a
hollow metal article ‘which. comprises the‘ steps
of supporting the article as one member and a
reducing die as another member relative to one
75 another, successively advancing one of said mem
successive relatively short lengths of the article,
-said supporting. taking place on unreduced sec
tions of the tube.
7. That method of'reduci‘ng the diameter of a 50
metal tube which comprises the steps of gripping
the tube along its exterior surface at an un
reduced portion, de?ectingthe wall of the tube
toward its longitudinal axis progressively over a
short length of the tube and in a direction to 55
ward the gripping mechanism, and repeating
such progressive deflection of the wall along such
short lengths, the said gripping taking eilfect at
a place not far 'removed from the place where
de?ection begins.
60
8. That method of reducing the diameter of a
hollow metal tube which comprises
steps of
gripping the tube along its exterior surface by
mechanical means at an unreduced portion ad
jacent a reducing die with a relatively short in
crement of the tube between the gripping mech
anism and the die, advancing one of said mem
bers relative to the other in a direction toward
the unreduced portion, and repeating the 're
sultant incremental die reduction to continuously 70
‘reduce successive lengths of the article.
. .
9. The method of claim 8 in which the grip-7
ping mechanism is adapted to open afteneach.
increment of reduction and the unreduced por
tion of the tube is fed forward through said 75
3
2,110,966
mechanism by retracting the die and using the
frictional grip of the die as the means for ad
a reciprocating die which‘ comprises the steps
of reducing the diameter during movement of the
die in one direction while gripping the same at
vancing said tube.
10. A_ method of reducing the diameter of a ' an unreduced portion thereof and feeding the
hollow metal tube which consists in gripping an
unreduced portion of said tube adjacent an end
thereof with an external stationary, releaseable
tube or article during ‘movement of the die in the
gripping mechanism, forcing a die of substantial
ly smaller internal diameter than the outer di
tube or article.
10 ameter of thetube over the free unreduced end
of the tube adjacent said gripping mechanism
whereby to reducev the diameter of a relatively
short length of the tube in a direction toward the
unreduced portion, releasing the gripping mech
15 anism without displacing same in relation to the
axis of the tube, retracting the die a short ‘in
terval while maintaining the gripping mechanism
stationary and using the frictional grip of the
die on the reduced portion of the tube to pull
20 another short increment of the unreduced por
tion through the gripping mechanism, closing the
gripping mechanism on the tube and holding it
stationary, again forcing the die over an in
crement of the imreduced portion toward the
25
stationary gripping mechanism, ‘and repeating
the series of operations continuously until the
tube has been reduced.
'
11. That improvement in the method of re
ducing the diameter of a metal tube or hollow
article throughout its entire length by means of
opposite direction by vsaid die, and repeating the
operation, throughout the entire length of the
>
_
>
12. A method according to claim 11 in which
the work bench usedfor reducing the diameter 10'
of the article is shorter]v than the article to be
‘reduced.
.
_
.
13. That improvement in the method of re
ducing the diameter ot'a metal tube or hollow
article throughout its'entire length bymeans of 1-5
a reciprocal die and a stationary gripping ele
ment which comprises the steps of reducing the
diameter of‘ the tube or article by movement of
the die in one direction while gripping the tube
or article at an unreducéd'po‘rtion thereof by the 20
stationary gripping element, and feeding the tube
or article by the frictional grip of the die during
movement of the die in the opposite direction, the
die being thus adapted to reduce and feed the
tube or article which is intermittently gripped 25
by the gripping element, and repeating the op
eration throughout the entire length of the tube
or article.
FRITZ SINGER.
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