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Патент USA US2121929

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June 28, 1938;
2,121,929
H,PUPPE
ROLLING ‘MILL
I‘
Filed July a1, 1937
2 Sheets-Sheet 1
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June 28, ‘1938. ?
H, PUPPE
ROLLING MILL
‘
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2,121,929
’
Filed July 31, 1937
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Patented June 28‘, 1938’
UNITED STATES PATENT‘ ‘OFFICE
'
_
2,121,929
ROLLING MILL
"Heinz Puppc, Neunkirchen, Germany
Application July 31, 1937, ‘Serial No. 156,779
'
In Germany March 4, 1936
4 Claims.
(01. 80—-35)
This invention relates to a rolling mill with roll
stands arranged in series for the continuous hot
rolling of strip iron or broad band iron, more
\
.
.
Figure 4 is a front view of any one of the roll
stands II or IV;
particularly strip or band iron having a breadth‘
-
>
' Figure 3 is a front view of any one of the alter
nate roll stands I, III or V;
'
‘
_
Figure 5 shows in cross section the shape of the
roll opening in one group of stands, this roll open
ing being concave on the upper side and convex
5 greater than 600 millimetres.
Experience has shown that in-these cases a
' pro?ling of the rolls such as is known in the
on the‘under side;
manufacture of individual sheets or of individual
'
Figure 6 is a similar view of the roll opening
of the intervening stands which is convex on the
upper side and concave on the under side;
Figure 7 is a view similar to Figure 5, but show
ing a narrower roll opening occurring at a later
stage in the series of roll stands, and
Figure‘8 is a similar view of the ?nishing roll
7 piles or fagots, wherein the roll openings of the
i0 successive roll stands are convex in shape, so
that each roll opening is less convex than the
roll opening of the preceding roll stand, is un
satisfactory, because vthe ?nal products are not
dimensioned correctly enough, the thickness of
' 15 the broad band iron produced?uctuates con- '
siderably, the condition of the edges leaves a
opening.
good deal to be desired, and ?nally the continu
ous removal of scale between one roll stand and
piece B’enters the rolling plant from the' left and
travels through the individual roll stands I to V, 20
the next is hardly practicable.
20
,
As will be gathered from Figure 1 the work
'
which are constructed as multiple roll stands,
each with two inner working rolls i, 2 or I’, 2’ of
relatively small diameter, and two outer sup
porting rolls 3, 4 or 3', 4' of larger diameter. In
‘other respects the construction of these roll 25
In particular the obtaining or producing of a
satisfactory surface in rolling strip iron of a
breadth exceeding 600 millimetres presents very
great di?lculties, because thev scale that forms on
_ the surface of the strip pan hardly be removed stands, which are equipped with the usual-driving
25 in the short space between the successive roll and adjusting means, is known.
stands, in view of the breadth of the band, sov
As shown in Figures 3 and 4 the rolls Iv and 2’
- that it is rolled into the surface of the band,
thereby leading to defective surfaces and even
to' a useless product.
Now according to- the present invention, these
30
disadvantages‘ are obviated by constructing the
roll- openings in the individual roll stands/convex
and concave, and by reversing this construction
between successive roll stands, the magnitude of
35 the convexity or concavity, or in other words the
angle that determines the magnitude of the con
vexity or concavity, preferably varying in such a
way that the roll opening has its
thick
ness in the ‘centre.
40
_
-
-
That the roll openings become progressively
?atter will be self-evident.
I
,
'
.
The roll stands may be equipped, as multi-roll
stands, with rolls of different diameters. This
' succession of stands may then be followed in a
45. known manner by multi-roll stands with straight
rolls, the working rolls of which are of smaller
diameter than the other rolls. “
vOne embodiment of th invention is illustrated
50 by way of example in the accompanying draw
ings, in which‘
_
-
.Figure 1 shows the rolling mill diagrammati
cally in side elevation;
‘
.
3
Figure 2 shows a sec ion on the line 2-2 in
has W71:
'
are concave, and the rolls l' and 2 are convex.
The roll openings in the stands I, III and V are 30
therefore convex as viewed from above and con
cave as viewed from below, whereas the roll open
ings of the stands II and IV are concave as viewed
from above and convex as viewed from below.
Before, between and behind the roll stands are
‘provided rollers 5. As Figure 1 shows, the work
may be given a looped-form if this should be
desirable.
Figures 5 to 8 show on a larger scale the shape
of the roll opening at 4 successive stages. In par 40
. ticular Figure 5 shows the workpiece Ga concave
' on the upper side and convex on .the under side,
as shaped by a convex upper roll and a concave
lower roll, like those of the stands II and IV.
Figure 6 hows the workpiece 8b with a convex
upper surface and a concave under surface, as
produced by a roll stand‘ withxa concave upper
roll and a convex lower roll, as in the case of the
roll stands I, III and V.
Figure 7 shows the workpiece 60 with a cross 50
section similar to that of Figure 5, except that it
has been reduced in thickness in its progress
- through the rolling mill. -~
Finally Figure v8 shows the cross section of the
?nished strip id.
.
If
2
2,121,929
The rolling operation proceeds as follows:
When the metal enters the ?rst roll stand, which
working rolls are alternately convex and concave,
and the curvature of the concave side of a roll
opening differing from the curvature of the con
ceives a cross section which is convex on the upper
vex side of the same roll opening.
side and concave on the lower side.
Since in the
next roll stand there is a convex upper roll and
a concave lower roll, the work receives a cross
section with a concave upper side and a convex
10 under side.
In succeeding roll stands there is
again a concave upper roll and a convex lower
' roll, so that the work receives a cross section with
a convex upper side and a concave under side.
This cycle of operations described above is re
15
' peated.
What I claim is:
1. A rolling mill with roll stands arranged in
series for the continuous hot rolling of strips and
broad long bands of iron of ‘a breadth greater than
20
nately concave and convex, whereas the said top
may be equipped for example with a concave
upper’ roll and a convex lower roll, the work re
600 millimetres, comprising roll stands arranged
>
3. A rolling mill with roll stands arranged
series for the continuous hot rolling of strips and
broad long bands of iron of a breadth greater
than 600 millimetres, comprising roll stands ar
ranged one behind each other, bottom working 10
rolls and top working rolls mounted in said roll
stands, the arrangement being such that the bot
tom working rolls of successive passes are alter
nately concave and convex, whereas the said top
working rolls are alternately convex and concave, 15
and each roll stand including supporting rolls in
addition to working rolls.
4. A rolling mill with, roll stands arranged in
series for the continuous hot rolling of strips and
broad long bands of iron of a breadth greater‘ 20
one behind each other, bottom working rolls and ‘ than 600 millimetres, comprising roll stands ar
top working rolls mounted in said roll stands, the
arrangement being such that the bottom working
rolls of successive‘passes are alternately concave
25 and convex, whereas the said top working rolls
are alternately convex and concave.
2. A rolling mill with roll stands arranged in
series for the continuous hot rolling of strips and
broad long bands of iron of a breadth greater
30 than 600 millimetres, comprising roll stands ar
ranged one behind each other, bottom working
rolls and top working rolls mounted in said roll
stands, the arrangement being such that the bot
tom working rolls of successive passes are alter
ranged one behind each other, bottom working
‘rolls and top working rolls mounted in said roll
stands, the arrangement being such that the bot
tom working rolls of successive passes are alter
nately concave and convex, whereas the said top
working rolls are alternately convex and concave,
the roll opening between the working rolls of at
least one roll stand at the end of the series being
straight, and the ?nishing working rolls being of‘ smaller diameter than the preceding rolls and
each roll stand including at least two supporting
rolls in addition to the working rolls.-v v
'
HEINZ PUPPE.
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