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Патент USA US2118715

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ay 24, 1938.
w. STRINGHAM
’
£318,715
THREE-HIGH MILL
Filed Aug. 6, 1935
v
'
.
,
INVENTOR.
'
, M L/AM STE/Nahum
1I
ATTORNEYQS,
aienied
ay 24, i
William Strlngham, Fran “ It. ilhio, assignor to
The American Rolling Mill Company, Mlddle- .
town, Ohio, at coration at Ohio
Application August 6, 1935, Serial No. 34,937
5 - Claims.
(or. cc-se) .
My inventionrelates to the structure of mills
known as three high mills, more particularly
where the middle roll is small in diameter in com
parison with the outer rolls.
5
In such three high mills, particularly where
used to roll packs ofsheets it is customary to
grind the middle roll with a “crown”. That is to
say, the middle roll isground so that its center is
thicker than its ends. The reason for this prac
m tice is to eliminate the excessive convexity of the
active passes in the mill when in use, due to
spring of the rolls therein.
'
customarily the outer rolls of the mill are _
ground truly cylindrical although sometimes they
15 are ground “hollow”, i. e., slightly less in diam
eter at the middle than at the edges, and some
times they are slightly "crowned”.
The amount of “crown” or lengthwise convex
ity of the middle roll will vary with the type of
work to be done.
"
Now in adjusting the screw on the rolls in a
three high mill for accurate working, there has
been considerable di?lculty, due to the fact that
if one screw applies more pressure to one end of
25 the middle roll than the other screw applies to
its opposite end, the middle roll due to‘ its length
wise convexity becomes cocked or shifts its posi
tion. This changes the shape of the active pass
In the drawing, the ?gure is avview partially
diagrammatic in nature of a three high mill. .
The diagrammatic feature is the amount of crown
and. height of roll end collar shown, which has
been exaggerated for purposes of illustration.
' 5
I have shown as exemplary housings, the stand
ards l, i, in which the bearings ii, 3 and t are
mounted slidably, said bearings serving to rotat
ably mount the top roll to, the middle roll to and
the bottom roll 2a, respectively.
10
The screws 5, serve to adjust the setting of the '
mill for operation.
.
.
,
It will be noted that the middle roll to is shown '
to be convex-in longitudinal section. As an ex 15
ample it will hesupposed that the diameter of
this roll at the central zone thereof is .015 inch
greater than at the ends thereof.
'
The outer rolls 2a and tar are illustrated as
truly cylindrical in shape, and collars or ridges
are formedat their ends each collar being ap- 2c
protely .0075 inch in height above the sur
face of the roll.
I
_
It can be seen that with such an arrangement
the collars on the ends of the outer rolls will con
tact with the ends of the middle roll, when the as
centers of the outer rolls contact with. the. cen
tral crowned zone of the middle roll.
, This accuracy of relationship need not exist
of the mill when in use and seriously a?ects the * but need only be substantially approximated.
30 accuracy of operation of the mill on both the low
er and the upper pass.
It is the object of my invention to do awaywlth
this dimculty, and I accomplish it by forming
Of course the piece being operated upon ' will so
not be wide enough to contact with the collared ,
portion of the outer rolls.
‘
'
As so arranged there will be no danger of cock
collars or ridges on both ends of the upper and ‘ ing the middleroll upon adjustment of the screws,
35 lower rolls of the mill su?iicient substantially to no dimculty due to the ?rst screw to be turned v35
equalize the. amount of crown on the middle roll. down throwing the mill out of transverse ad- '
I am aware of the fact that in two high mills justment so that the second screw cannot be
in order toprevent the surfaces of the rolls from turned down an equal amount. The dimculty at
contacting with each other when the mill is
no running idle, and to prevent the rolls from be:
coming injured when they cometogether alter a
piece has passed through them, collars have been
formed on the roll ends. My invention does not -
concern'this idea, nor do I attempt to vgain such
~ an effect or to permanently space away the mid
dle roll from all contact with the outer rolls. In
tendant upon rolling of quite wide, thin packs
or pieces where accuracy of active pass shape is do
of particular importance; has been largely avoid
ed in practice by the use of the abovedescribed
simple expedient.
'
'
the machinery normally employed will be inter
deed the central zone of the middle roll will ordi
narily contact the outer rolls when the mill is , fered with by the‘collars. It would, however, be
a feasible mode of carrying out my invention to
running idle, according to my invention.
I accomplish my, object bythat certain con
struction and arrangementsof parts of which an
example will be described in detail and has been
illustrated in the drawing. The inventive fea
tures are set forth in the claims that are ap
55 pended, to which reference is hereby, made.
,
It is desirable to form the collars on the outer
rolls rather than the middle roll because in t5
grinding the‘convex middle roll to desired shape
place'the collars on the middleroll. '
50
,_\ving thus described my invention, I will
set forth in the following claims the invention
inherent therein-upon vwhich I ask for Letters
Patent:---
‘
1. In a are high 'mill having a middle mu 5% .
2
2,118,716
which is convex in longitudinal section, upper and
lower rolls having at the ends collars abutting
against the middle roll and of a height such as
substantially to compensate for the greater diam
eter of the middle roll at its central zone, when
the mill is idle, for the purpose described.
2. In a three high mill having a middle roll
which is convex in longitudinal section, upper and
lower rolls abutting the same at the middle zone
thereof, when the mill is idle, the contour of said
upper and lower rolls differing from that of the
middle roll so as not to be a counterpart thereof,
the ends of the respective rolls beyond the work
ing area thereof being such that when the three
4. In a three" high mill having a middle roll
which is convex in longitudinal section and upper
and lower non-conforming. rolls, the said rolls so
formed at the ends beyond the working faces
thereof, that when their working faces abut at
the middle‘ zone, when the mill is idle, they will
abut each other at the ends beyond the working
faces, at the same time.
5. A three high mill having outer rolls and a 10
middle roll of smaller diameter, said middle roll
being convex in longitudinal cross section, and
means for preventing ‘misalignment of the rolls
upon actuation of the screw down, said means
thereof, they will abut each other at the ends
comprising annular raised portions at the ends 15
of the outer rolls of su?icient height to offset the
also.
diiference in. diameter between the central part
15 rolls are brought together at the middle zone
'
'
~
3. In a three‘ high mill having a middle roll
which is convex in longitudinal section and up
20 per and lower non-conforming rolls, the upper
and lower rolls so formed at the end beyond the
working faces thereof, that when their surfaces
substantially abut the middle zone of the middle
roll, they will abut the middle roll at the ends
thereof also.
of the middle roll and its ends, said raised por
tions acting to prevent an approach of the ends
of the outer rolls to the ends of the middle roll 20
closer than would be permitted by the diameter
of the central part of the middle roll without
cocking of said roll.
STRINGHAM.
25
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