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Патент USA US2126509

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f Aug. 9, 1938.
J. SEVERIN
2,126,509
TUBE ROLLING MILL
Filed Nov. sa, 1954
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2 Sheets-Shea?J 1
f f Aug. 9, 1938.
J. SEVERIN
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Filed Nov. 9, 1934
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2,126,509
TUBE ROLLING MILL
A
2 Sheets-Sheet 2
2,126,509
Patented Aug. 9, 1938
UNITED STATES PATENT ori-‘ICE
2,126,509
'rUnEaoLLma Mns.
,me Severin, Maximin-num, omar, animar
to Deutsche Böhrenwerke Aktiengesellschaft,
`
Dusseldorf, Germany
Application November 9, 1934, Serial No. 752,281
ln Germany November 25, l1933
s claims. (Cl. 8F13)
It is known to producetubes from hollow bil
lets by stretching the billets-chiefly in the axial
direction-by means of rolls the axes of which>
are at an angle to the axis of the hollow billet
5 and whose path of travel on Vthe outer and inner
faces of the hollow billet is 'of helical- form; the
ing operation. Even when the rolls in the an
nular roll frame are not driven by spindles from
the gear roll frame disposed on the same'axis,
but laterally, considerable difliculties are en- _
countered in the returning of the rolled material; 5
these difliculties are caused by the operatives'
rolls of the set of rolls around the periphery> of working on the rolling mill being obliged to re- _
the hollow billet are successively profiled in such l set the inside and outside rolls required for `the
manner that each succeeding vroller further
10 treats the section'of hollow billet already treated
by thek preceding roll. In these processes the
outer rolls alone effect the shaping, while, in the
interior of the block, a mandrel or smooth roll
serves as a support, or alternatively rolls on the
15 inside take part in the shaping operation o? per
next passage after each passage through the
mill.
'
`
'
rolled through ,the rolling mill itself there is a
further passing through of the material in the »
opposite direction; thus -:l’or example a method 15
form it alone, while the outer rolls act as a
is known in which the rolls of an inclined roll
smooth support.
ing mill as ordinarily employed for piercing solid
.
The various kinds of shaping which are car
ried out by the profiled rolls differ in two princi
20 pal respects. In one group the profiled rollers
veiîect an operation known from the time of forg
ing by the term “reduction by lowering" in which
grooves are pressed into the billet by the first
pair of rolls, so that a part of lthe blank is
25 reduced ln diameter vtowards one end of the hol
low billet; the part in question being widened
smoothly towards the end .by shoulders on the
succeeding rolls which at the same time spread
the metal while sometimes making deeper the
30 groove which has been formed in the metal by
the ñrst pair of rolls. In the second method the
hollow billet is shaped by rolls profiled conieallyJl
or smoothly or formed pointed ln steps, in a
manner corresponding to a drawing operation.
35
In- the known processes the material being
rolled is passed into the rolling mill on one
10
Methods of producing tubes are known in
which after each passage of the material being
cylindrical billets are so provided that certain
of the rolls cause the piercing while the ma,
terial is passing through the rolling mill in one 20
direction while during the reverse movement,
after the change of direction of the rolls, the re
maining rolls cause the material which has been
pierced while travelling in the original direction
to be stretched, whereby the walls of the tube 25
produced are reduced in thickness and its length
increased. Another known process, which makes
useV of the known conical roll discs for the in- '
tended shaping of the material being rolled effects
the to-and-fro movement of the rolled material 30
by using guides'which are so provided that in
one case -the material being rolled is guided to
the discs above their centre of rotation while in
the other case the feed is effected below the
centre of rotation of the
s which effect the 35
change of shape, and thus the direction of roll
side--the "entry" side-until it isV gripped by the ing is reversed without the reversal of the direc
rolls and then driven through the rolling mill tion of rotation of the shape-changing discs.
by them. The blank leaves the rolling mill on the '
These known methods for changing the di
49 “discharge’ side, and if it is to be passed through rection of rolling cannot beemployed for the 40’
the rolling mill a second time, it must again be processes hereinbefore described in the second
carried back to the entry side before it can again paragraph, because in these processes the re
pass through the rolling mill. This conveying of
the billet from the discharge side to the entry
45 side is attended with diiiiculties and disadvan
`tages. The rolling mills employed for carrying
out the processes hereinbefore referred to are
usually provided with a ring-shaped roll frame
which carries the outer rolls that are driven by
5o spindles from a gear roll frame whose axis lies
in alignment with the axis of the roll frame.
turning of the material being rolled` cannot be,
made possible solely by`reason of the fact that the
.rolling mill is run in the opposite direction. For 45
in these processes herelnbefore referred to the
rolls are so profiled that the rolls whichfflrst
come into action during the ‘hrst passage of the
material through the rolling mill grip the work
by their shape-changing parts, the hollow blankV 50 I
having its -original thickness, while the shape?
changing parts of the other rolls are unable to
These spindles hinder the blank from being re
turned to such a degree that the heated blank function correctly until the'preceding rolls have f
cools considerably, which is la distinct disad-v already carried out part of the shape-changing
55 vantage in connection 4with thesubsequent roll
operation.` During the reverse movement -of such 56 ,
2,126,509
a rolling mill the shape-changing parts of the
rolls that were last operating during the forward ‘
movement would be the ilrst to grip the material.
They would then be so heavily loaded that the
rolling mill would break or the billet would not
be properly treated.
-
It is proposed according to the Ainvention to
entry side in the anti-clockwise direction, that ~is
to say the material rotates in one direction in re
lation to the direction of passage of the tube
through the‘ mill. The direction of the return
movement is indicated by dot-and-dash arrows.
In order to bring into use the passes Ki, K2, K1,
K4, K5, Ks, or K’i, K'z, K’J, K'4, K's, K’s in the
' ron the billet in been directions through rolls requisite manner and at the right time lfor the
with two passes, which correspond to the se _ shaping operation the working rolls are provided
10 quence in the forward and rearward movements,
the rolls whose first passes are operative in the
forward movement being rocked after the for
ward movement, through such an angle that the
' second passes provided for the return movement
come into the working position. The reduction
in the thickness of the material being rolled,
which has been obtained as the result of the ñrst
passage through the rolls must be taken into ac
count when determining the calibration of the
return movement. The two passes of the outer
and inner rolls, or only of the outer rollers or
only of the inner rolls can be set singly, it being
possible for each of the rolls with two passes to
»be replaced by two rolls each adapted to be pro
25
illed individually.
l Apparatus according to the invention is dia
grammatically illustrated by way of example in
the .accompanying drawings.
Y
Figure 1 illustrates in longitudinal section a
30 `roller mill with inner and outer rolls- which are
capable of being rocked out of alignment.
Figure 2 illustrates asimilar rolling mill withl
inner rolls only which are capable of being thus
moved.
Figure 3 illustrates a similar rolling mill with
outer rolls only which are capable of being thus
moved.
Figure 4 illustrates a complete tube rolling mill,
with setting devices for rocking rolls B.
Figure 5 illustrates the mandrel head of a roll
40
ing mill provided with pairs of rolls each sepa
85
to be capable of rocking that is to say the outer
and inner rolls in Figure l only the inner rolls
in Figure 2, and only the outer rolls in Figure 3.
'I'he rocking angle here corresponds to the depth
of the depression. The pivotal points about
which the rolls are rocked in the examples illus 15
trated in Figures l to 3 are outside the rolls on
the original entry side. They may, however, be
otherwise selected, that is to say they may be
inside the rolls themselves or at any other posi
tion according to the change of shape desired or 20
type of rolling mill employed.
An example o1'
this is illustrated in Figure 4.
In the constructions shown in Figures 2 and 3,
in which only the inner or the outer rolls vare
rocked, the material being rolled moves the ilrst 25
time it passes through-that is in- the direction
indicated by the full line arrow as in the example
according to Figure l freely through the second
pass without contacting with it. In the return
movement of the material from the original dis 30
charge side in- the direction indicated by the
arrow in dot-and-dash lines, the passes K1 etc.
‘formed by the rolls and their non-rocking coun
ter rolls become operative after the rocking of
the inner or outer rolls, by reason of the fact
that the rolls to be rocked are rocked not only to
the extent indicated in Figure 1 but beyond this
to such a degree that an increase or reduction is
obtained in the diameter of the material by rea
son of the coning or entry of the inner and outer 40
rolls, as will be seen from the dot-and-dash lines
rately calibrated.
.
at F. Figure 2 illustrates a different roll pass
Each of the Figures 1 to 3 of the drawings il
from that shown in Figures 1 and 3.
lustrate a rolling mill provided with a circular
'I'he inner rolls are secured to the mandrel E
45 series of six pairs of rolls with the shaping parts' in knownmanner by means of a roll head D.
operating on single helical lines when rotating in As will be seen from Figure 4. the outer rolls 45
the clock-wise direction. Where it is advisable, ` B are mounted to rock in bearings H and in siml
for the sake of cleamess, only to show in the lar manner the inner rolls C are mounted in
drawings two pairs of rolls, the remaining rolls bearings J. 'I‘he bearings for the inner rolls are
are indicated in the-following description by ref,
capable oi' rocking by reason of their spherical
erence letters that do not appear on the draw
supporting base. 'I'he rocking movement as such
ings. Thus,.outer rolls may bepresumed to vbe can be obtained by a very large number of known
. numbered B1', lBz, Ba, B4, Bs and Bs and of these machine elements.
Bi and B4 are shown in the drawings and the in
Figure ârillustrates a modified construction of
ner rolls may similarly be considered to be num
the roll head D which is provided with a support
bored Ci, C2, Ca, C4. Cs, Cs and 0f these Ci and C4 for the inner rolls C at the middle position, each 55
are shown in the drawings. The material A en
of the inner rolls being divided into two rollers
ters the iirst pass in the direction indicated by each having a separate pass. This arrangement
the full line arrow. The parts of the rolls which has the advantage that rolls or roll spindles of
operate on the entry side are numbered Krl K2, small diameter may be employed just as might
60
K1 K4, Ks and K4, of which K1 and K4 only are
possible with undivided rolls on account of
shown in they drawings, the pass K1 functioning be
their length.
'
‘
during the tlrst passage of the material while the
I
claim:
pass Ks is operative last of all. In addition to
1. A rolling mill for producing tubes from hol
65 these passes each roller is provided with passes
list
K’i, K’z, K'a, K’4, K's, and K'a, K': and K’a only
being shown. K'1 being formed by the rolls which
. form the pass Ks in the direction of the original
en_try side and the pass K'a being-formed by the
70 rolls which form the pass Ki in the direction of
the original entry side. If during the `ilrst pas
sage the material being rolled is rotated from
that position which may be termed the original
entry side in the clockwise direction, it must in
75 the return movement be rotated from the original
low billets by stretching, particularly in the axial
direction, and comprising several sets of inner and
outer rolls, the inner and outer units of which
have their axes lying inclined to the path of travel
of the hollow billet and are adapted to op’erate
respectively upon the outer surface and the inner
surface of the hollow billet by grooving the mate
rial on helical lines and widening the groove, the
rolls of the several sets of rolls which successively
operate upon the billet being formed with passes
related in such manner that every succeeding roll 75
i
einem@
sets oi rolls include sets of which one roll is of
fixed position and is of a form such that the
set acts upon the part of »the hollow billet which
has already been acted upon by the preceding roll
set, and Ineens whereby the mill is adapted for
rolling the hollow billet in both directions of travel
through it, the said means consisting of passes
provided upon the units of the several sets of rolls,
required pass comes into operation according tg
the direction of travel of the hollow billet, and a
second roll is adapted to be adjusted to render
the two passes of the said rolls alternatively oper
ative, the said rolls being provided with means
for eilecting the required adjustment.
certain of which passes are eiïective in one direc
tion of travel of the hollow billet and certain of
which passes' are effective in the reverse direc
tion oi travel oi the hollow billet, the passes for
the reverse direction of travel being formed and
positioned to continue the working of the billet
carried out by the passes that are operative in the
forward direction oi travel of the billet and the
rolls of each set of rolls being rotated in the
reverse direction of rotation for the return direc
tion of travel of the billet.
,
2. A rolling mill according to clnlm 1, having,
included in the sets oi' rolls, rolls hoi/ing passes
which are operative respectively in the two direc«
tions of travel of the hollow billet end ineens
whereby the axes of the rolls may be roclred- to
bring the pass required into operative position.
3. A rolling mill according to c
l, wherein
. i. A rolling mill according to claim 1,v having.
included in the sets of rolls a set oi.` rolls which
are operative for the one direction of travel oi
the hollow billet and other sets of rolls which are
operative for the return direction oi travel of the
hollow billet.
.
5. A rolling,r mill according to claim i, wherein 15
the sets of rolls are provided to include sets oi‘v
rolls of which one roll is formed with passes
which are alternatively operative according to
the direction of travel oi' the hollow billet and
other rolls which are alternatively operative ac 20
coi-ding to the direction ofv trnve’i oiîfthe hollow
billet «eo-operate respectively with the posses oi
the
st roll.
JOSE SEVF’RÍN.
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