Improvements relating to the Rolling of Ribbed Plates, and to Apparatus therefor.
Year: 1893

page_text: Date of Application, 28th Feb., 1893
Complete Specification Left, 28th Nov., 1893-Accepted, 24th Feb., 1894
PROVISIONAL
SPECIFICATION.
Improvements relating to the Rolling of Ribbed Plates, and to
Apparatus therefor.
I, CARL LÖHR, of Christinenhütte, near Meggen, Westphalia, in the Empire of
Germany, Manufacturer, do hereby declare the nature of this invention to be as
follows:-
c
My invention relates to the rolling of ribbed plates and to apparatus therefor..
Ribbed and fluted plates have heretofore been produced by ordinary two-high
rolling mills the upper roller of which is provided with grooves. The plate, which
is to be made in one piece, must be rolled out the more the higher the ribs are.
But the more the plate is rolled out the greater must be the pressure to be applied.
With an equally strong pressure rollers having a smaller diameter can effect the
rolling out to a greater extent than rollers having a larger diameter. However, the
two rollers must not have too small a diameter, as they will then be bent.
Accordingly the greatest possible rolling out is determined by the limit of
resistance of the standards and the smallest admissible diameter of the rollers.
Plates with higher ribs are of great importance for engineering purposes,
because their surface becomes rougher and more durable and wears less rapidly,
and because a great saving of material is realized, such plates with a base of the
same thickness being stronger and having more bearing strength, so that thinner
plates can be employed than before for a definite object. Further advantages
result from the smaller weight.
I manufacture such plates with higher ribs by a rolling mill having three rollers
arranged similarly as in a three-high rolling mill, and the middle roller of which
has as small a diameter as practicable. The plate is worked between the upper or
the lower rollers, so that either the lower or the upper roller serves as a counter
support for the thin middle roller.
It is expedient to provide the middle roller with the grooves for the formation of
the ribs, but the upper roller and, when special devices are used, even the lower
roller
may also possess the grooves.
Between the middle roller and the counter-pressure roller such an enormous
pressure takes place along the line of contact that the edges of the grooves would
break off if the roller were made as heretofore of chilled cast iron and provided
with the ordinary grooves. For this reason the grooved roller is made of tough
Bessemer steel and the edges of the grooves are somewhat bevelled on either side
to the width of a few millimetres.
The operation of the improved rolling mill caunot take place as is customary in
three-high rolling mills, where the rollers simply rest one upon the other and only
the lowest roller is driven while those above are carried away by pressure and
friction. The shock produced after each pass of the plate by the descent of the
raised rollers would rapidly injure the grooved steel rollers, as the upper and lower
rollers consist of chilled cast iron. For this reason the two upper rollers are
provided with a common balancing device. The upper roller is carried with its
bearings by two rods and the middle roller is held up and pressed against the upper
roller by springs which are adjusted by screws.
As in this case the middle. roller does not touch the lower roller which is driven,
the upper rollers must be actuated by the lower roller in a special manner. This
takes place by wheels arranged upon the journals of the rollers. A toothed wheel
on the lower roller is fastened by means of the key, whilst the two toothed wheels
which transmit motion to the two upper rollers are not fixed upon the journals of
TD 077

page_text: these rollers but are placed on the same with intervention of friction gear to
equalize the irregularities in the circumferential volocity of the rollers during the
work. The journal of the middle roller is prolonged to the toothed wheel to form
The
frictional surfaces between the side of the same and the end of the journal.
journal of the middle roller carries on the other side a ring which turns with the
journal but can be displaced thereon. According as this ring is pressed against
the toothed wheel by means of a screw and bridge piece a greater or smaller
friction is produced between the surfaces. When this intermediate gear has been
suitably adjusted the middle roller may be driven either by the pressure of the
upper roller alone or may be additionally carried away by the wheel on the journal
of the said middle roller. The wheel on the journal of the upper roller consists of
a middle part provided with the teeth, and adjustable cheeks designed to clamp the
said middle part, the pressure being regulated by screws.
By the described mode of operation of the rolling mill I fulfil the conditions
under which the employment of a thin middle roller is practicable in the manu-
facture of ribbed plates. The arrangement of the ribs of the plate is optional. In
lieu of one supporting roller for the thin middle roller, two or more rollers may be
employed.
DL: 00th day f Fahrmor 1902
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.
COMPLETE SIEVITICATION.
Improvements relating to the Rolling of Ribbed Plates, and to
Apparatus therefor.
I, CARL LÖHR, of Christinenhütte, near Meggen, Westphalia, in the Empire of
Germany, Manufacturer, do hereby declare the nature of this invention and in
what manner the same is to be performed to be particularly described and
ascertained in and by the following statement:-
My invention relates to the rolling of ribbed plates and to apparatus therefor.
Ribbed and fluted plates have heretofore been produced by ordinary two high
rolling mills, the upper roller of which is provided with grooves. The plate, which
is to be made in one piece, must be rolled out the more the higher the ribs. But
the more the plate is rolled out the greater must be the pressure applied. With
an equally strong pressure rollers having a smaller diameter can effect the rolling
out to a greater extent than rollers having a larger diameter. However, the two
rollers must not have too small a diameter, as they will then be bent. Accordingly
the greatest possible rolling out is determined by the limit of resistance of the
standards and the smallest admissible diameter of the rollers.
Plates with high ribs are of great importance for engineering purposes,
because their surface becomes rougher and more durable and wears less rapidly,
and because a great saving of material is realized such plates with a base of
the same thickness being stronger and having more bearing strength, so that
thinner plates can be employed than before for a definite object.
Further advantages result from the smaller weight.
I manufacture such plates with higher ribs by a rolling mill having three rollers
arranged similarly as in a three-high rolling mill, and the middle roller of which
has as small a diameter as practicable. The plate is worked between the upper
or the lower rollers, so that either the lower or the upper roller serves as a counter
_support for the thin middle roller.
wheels
In the accompanying drawings,
Figure 1 is a partial vertical section and end view of the gear
respectively of a three-high rolling mill constructed according to my invention.

page_text: AE CITYQI UL
bearings.
Figure 3 is a detail view of the middle roller.
Figure 4 shows a part of the developed periphery of the roller with inclined
grooves.
Figure 5 is a transverse section of part of a ribbed plate produced by the said
roller and
Figure 6 is a cross section of one of the grooves.
In the rolling mill represented in the drawings the plate is rolled out between
the lower rollers. It is expedient in this case to provide the middle roller with
the grooves for the formation of the ribs, but the upper roller, and when special
devices are used even the lower roller may have the grooves.
Figure 3 represents the middle roller. A roller with the proportion between the
length and diameter shown in Figure 3 could not heretofore be used for the
production of ribbed plates in the ordinary two-high rolling mills. Between
the middle roller aud the counter pressure roller such an enormous pressure takes
place along the line of contact that the edges of the grooves would break off it
the roller were made as heretofore of chilled cast iron and provided with the ordinary
grooves. For this reason the grooved roller is made of tough Bessemer steel, and
the edges of the grooves a, are somewhat bevelled on either side at 6 to the
width of a few millimetres as shown to an enlarged scale in Figure 6.
The ribbed plate has a base of 2 millimetres in thickness and ribs d of
2 millimetres in height as shown in Figure 5, which plates could not be produced
by the rolling mills heretofore employed.
The operation of the rolling mill represented in Figures 1 and 2 cannot take
place as is customary in three-high rolling mills, where the rollers simply rest one
upon the other, the lowest roller only of which is driven while those above are
carried away by pressure and friction. The shock produced after each pass of the
plate by the descent of the raised rollers would rapidly injure the grooved steel
rollers, as the upper and lower rollers cousist of chilled cast iron. For this reasou
the two upper rollers are provided with a common balancing device constructed as
follows: The upper roller is carried with its bearings u by two rods v, and
the middle roller y is held up and pressed against the upper roller by springs on
the said rods which are adjusted by means of nuts g y.
.C
b
As in this case the middle roller does not touch the lower roller z which is
driven, the upper rollers must be actuated by the lower roller in a special manner.
This is effected by wheels arranged upon the journals of the rollers. A toothed
wheel on the journal of the lower roller is fastened thereto by means of the
key k, whilst the two toothed wheels i and m which transmit motion to two upper
rollers and y are not fixed upon the journals of these rollers but are attached to
the same by friction gear to equalize the irregularities in the circumferential
velocity of the rollers during the work. The middle roller is prolonged to the
toothed wheel to form frictional surfaces at r between the side of the same aud
the end of the journal. The journal of the middle roller is provided at its
opposite end with a rings which turns with the journal but can be displaced
thereon. According as this ring is pressed against the toothed wheel by means of
a screw u¹ and bridge piece t a greater or smaller friction is produced between the
surfaces r. When this intermediate gear has been suitably adjusted the middle
roller may be driven, either by the pressure of the upper roller alone, or it may be
additionally operated by the wheel on the journal of the said middle roller. The
wheel m on the journal of the upper roller consists of a middle part m provided
with the teeth, and adjustable cheeks o and p designed to clamp the said middle part,
the pressure being regulated by screws n.
By the above described mode of operation of the rolling mill I falfil the
conditions under which the employment of a thin middle roller is practicable in
the manufacture of ribbed plates. The arrangement of the ribs of the plate is

page_text: optional. In lieu of one supporting roller for the thin middle roller, two or more
rollers may be employed.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that. what I
claim is :-
First. The rolling of plates with high ribs between a roller of large diameter
and a roller of small diameter, the thin roller being supported by one or more
counter rollers and the said working rollers being so balanced that they do
not touch each other when running idle, in order to prevent the breaking off of the
edges of the grooves owing to the concussion of the rollers, substantially as
described.
Second. In a rolling mill for rolling ribbed plates as described in the first claim,
the arrangement of grooves in the large or small working roller with bevelled edges b
Figure 6, in order to obviate injury to the edges of the grooves by the working
pressure, substantially as described.
Third. A rolling mill for rolling ribbed plates as described in the first claim, in
which the rolling out takes place between.the two lower rollers y 2, the middle
roller y being forced by springs against the upper roller carried by bearings u, the
driven lower roller actuating the middle roller and upper roller by means of
toothed wheels him, the two upper wheels i m of which are connected with friction
gear in order to equalize any irregularities in the circumferential velocity of the
upper and middle roller, substantially as described.
נים
1
AT
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.