Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
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The present invention relates to a rolling device in rolLing
mills, for guiding material to be rolled into roll grooves.
In conventional rolling mills, a guide bar and guiding rails are
used for steering the material to be rolled between the rollers.
In a special type of rolling mill with a manipulator, the material
for rolling is handled during rolling by means of a gripper with
clamping plates for gripping the material. To steer the ~aterial
between the rollers one must, however, combine the gripper with
the conventional guide bar in such rolling mills.
The present invention has the object of providing a roller device
for rolling mills to steer the materiaL to be rolled in between
the rollers, this rolling device replacing the conventional guide
bar and guiding rails or the guide bar and gripper.
The rollin~ device according to thc invention is for use in roll- `
ing mills for pushing material to be rolled into a roll groove.
The device comprises two pairs of guide rollers rotatable about
their rotationaL axes. Each pair o~ rollers is displaceable to-
wards and away from each other and each of the two pairs of guide /;
rollers is rotatably mounted on a shaft which is generally paral-
lel to the rotational axes of the rollers. The guide rollers arearranged to retain wikh their circular surfaces the material to
be rolled and to push the material in the roll groove between
the rolls.
According to an especially preferred embodiment of the invention,
the rollers are provided with ratchets. The rotational axes of
the rollers are preferably generally perpendicular to the rota-
tional axes of the rolls. According to a special characteriæing
feature of the invention, the circular surfaces of the rollers are
concave, especially V-shaped. The number of rollers is suitably
four, the rollers being arranged displaceable in pairs towards and
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away from each other, and according to a suitable embodiment,
each of both roller pairs is pivotably mounted on a shaft sub~
stantially parallel -to the axes of the rollers.
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The grippers with clamping plates, used in known rolling mills
for handling material to be rolled, give friction between the
material or billet when it is drawn into the roll groove. By ~;
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using a rolling device with rotating rollers according to the in~
vention, this friction is instead avoided, and by providing the -
rollers with ratchets according to a special embodiment, they ;
~can push the material to be rolled in between the rolls, similarly ~-
to the gripper with clamping plates. The V-shaped circular sur-
face of the rollers allows them to provide support for the ~ -
material to be rolled so that the conventional guide bar can be j ;
dispensed with.
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The invention will now be described in detail in -the following ~:
while referring to the appended drawing, on which an embodiment ~.-
of the invention is schematically illustrated as an example. !:
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Figure 1 on the drawing is a side view of the invention, and
illustrates the position of the roller device in relation to the
rolls and the guide channel for the material to be rolled, as
well as illustrating the suspension of the roller device.
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Figure 2 is a sectional view along the line II-II in Figure 1, ;~ `
and Figure 3 is an end view of the roller device and guide channel. `
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The roller device 1 illustrated on the drawing consists of four
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rollers 2, mounted in pairs through their rotational axes 4, each
pair in a frame 3. In turn, both frames 3 are each pivo-tably
mounted on a shaft 5, the shafts each being mount~d in a gripping ~;
arm 6 in a manipulator head for a rolling mill. The rollers 2 ;~
are provided with ratchets so that they can only rotate in one
direction, i.e. according to the arrows in Figure 2. ~ach of
the gripping arms 6 is pivotably mounted on a shaft 7 in the
manipulator head. In Figure 2, the full lines denote the position ;~
of both halves of the roller device when the gripping arms 6 ^ -
1~ assume their outwardly swung attitudes, while the chain-dotted
lines denote the attitude of the roller device halves when the
gripping arms 6 assume their inwardly swung attitudes.
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The roller device 1 is centered opposite the nip between two rolls ;'
8 having seven roll grooves 9, intended for rolling a bille-t 90 ;;
mm square into a bar of 50 mm diame-ter. On the side of -the roller
device 1, remote from the rolls, there is arranged a guide channel
10 to receive the billet coming from the rolls 8.
When a billet is to be rolled, it is gripped with the help of
the roller device 1 by both the roller device halves being moved
together into the attitude 1~ shown by chain-dotted lines in
Figuré 2. The roller device with the gripped billet is then lined
up with the bottom roll groove 9 in Figure 2, by the uni-t in which
the roller device and the guide channel 10 are incorporated in
the maniuplator head being displaced transversely. Since the
circular surface of the rollers 2 is V-shaped and since the rollers
are four in number, i.e. two on either side of the billet, the
roller device is given a fast and steady grip on the billet and
can guide the billet into the roll groove without difficulty,
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and when the rolls have gripped the billet for pullin~ it through,
the rollers 2 do not exert any friction on the billet, since they `
are freely rotatable in the feeding direction of the billet to~
wards the rolls. Since, on the other hand, the rollers 2 have ,-~
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ratchets hindering ~otation in the other direction, they prevent
the billet being thrown back from the nip. When reversing the '~r~ ~,
billet, the roller device halves are moved apart and the billet
is steered in onto the guide channel 10, and on subsequent roll~
ing through the next roll groove, the procedure described above ;.
'~is repeated.
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Hereinbefore there has been described a special embodiment of a
roller device according to the invention, having all the advantages
of the inventive subject, but the invention is not limited to
this one special embodiment, and may embrace:all the embodiments
falling wi-thin the scope of the paten-t claims. '~;!
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