LOW-FRICTION BENDING SYSTEM IN A ROLL STAND COMPRISING SEVERAL ROLLS

SYSTEME DE FLEXION AVEC PEU DE FROTTEMENT DANS UNE CAGE DE LAMINOIR A PLUSIEURS CYLINDRES

English Abstract

Disclosed is a device for bending the rolls in a roll stand comprising several
rolls. Said device is provided with bending blocks which are fastened between
the built-in roll parts and the stand windows at the delivery end and the
discharge end, the top and bottom bending blocks being connected by means of
piston cylinders and/or a vertical positioning mechanism, preferably a spindle-
type lifting gear unit. A bending force can be introduced into the bending
blocks (5, 5a) which are connected on the same side via a piston cylinder (7)
while the opposite bending blocks (5', 5a') can be positioned and locked via
the spindle-type lifting gear unit (10).

French Abstract

La présente invention concerne un dispositif de flexion pour les cylindres d'une cage de laminoir à plusieurs cylindres, qui comprend des blocs de flexion fixés côté entrée et côté sortie entre les empoises de cylindre et les ouvertures d'ossature. Les blocs de flexion supérieurs et inférieurs sont reliés au moyen d'un cylindre à piston et/ou au moyen d'un système mécanique de positionnement vertical, de préférence au moyen d'un vérin de levage. Selon cette invention, d'un côté une force de flexion peut être appliquée par le cylindre à piston (7) dans les blocs de flexion reliés du même côté (5, 5a) et d'un autre côté les blocs de flexion opposés (5', 5a') peuvent être positionnés et bloqués par le vérin de levage (10).

Claims

We claim:
1. Device for bending the rolls in a rolling stand
comprising several rolls with the use of bending blocks, which
are mounted at the run-in end and the runout end between the
roll chocks and the housing windows and can be acted upon by
control elements, characterized by the fact that a piston-
cylinder (7) is assigned to the bending blocks (5, 5a) of one of
the mill housings (6), and a vertical positioning mechanism (10)
comprising a spindle-type lifting gear unit is assigned to the
bending blocks (5', 5a') of the opposite mill housing (6').
2. Device in accordance with Claim 1, characterized by
the fact that a roll change position can be vertically adjusted
by the vertical positioning mechanism (10).
3. Device in accordance with Claim 1 or Claim 2,
characterized by the fact that the piston-cylinder (7) comprises
a piston (8) mounted in one of the bending blocks (5) and a
connecting rod (9) to the other bending block (5a).
6

4. Device in accordance with any one of claims 1 to 3
wherein the spindle-type lifting gear unit is coupled to the
bending blocks (5', 5a') and operable to selectively adjust the
spacing therebetween.
7

Description

CA 02498303 2010-01-25
LOW-FRICTION BENDING SYSTEM IN A ROLL STAND
COMPRISING SEVERAL ROLLS
The invention concerns a device for bending the rolls in a
rolling stand comprising several rolls with the use of bending
blocks, which are mounted at the run-in end and the runout end
between the roll chocks and the housing windows and can be acted
upon by control elements.
Devices of this general type are used for flatness control
of a rolled product as control elements for bending the work
rolls. The control element has a direct effect on the roll gap
geometry in the strip edge region, such that the work rolls are
bent positively around the edge of the rolls lying above them
and negatively around the edges of the rolling stock.
German Patent 22 50 953 describes a rolling stand with work
rolls and backup rolls and a roll bending device, in which the
chocks of the work rolls are supported between blocks anchored
in the housing windows and are connected by piston-cylinder
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units, which are assigned to the blocks and can be acted upon on
both sides to effect the work roll camber correction, such that
on each block a lower and an upper guide member are supported in
such a way that they can be moved vertically, whereas one of the
guide members holds the cylinder, and the other guide member is
connected with the piston, and the guide members are connected
with the chocks in a positive-locking way in the vertical
direction by horizontal guides, which are continued between the
housings parallel to the rolls for the roll change. In this
way, it is intended that two piston-cylinder units are necessary
on each side for roll bending.
This device has proven effective in practice. However, it
has the disadvantage that the cylinders must be arranged on the
drive end and the tending end and on the run-in end and the
runout end. This movable support of each end necessarily
results in high frictional forces, which, in addition, have
negative effects on the flatness control.
The goal of the invention is to reduce frictional forces in
a system of this general type.
To achieve this goal, it is proposed that a piston-cylinder
be assigned to the bending blocks of one of the mill housings,
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CA 02498303 2010-01-25
and that a vertical positioning mechanism be assigned to the
bending blocks of the opposite mill housing.
The positioning and locking of the bending blocks by means
of the vertical positioning mechanism, preferably a spindle-type
lifting gear unit, make it possible to produce a center of
rotation about which the chock can be rotated. Thus, only one
cylinder each is necessary to introduce the bending force into
the bending blocks at the drive end and the tending end.
By virtue of the fact that there are now only two cylinders
being used in the rolling stand to introduce the bending force
into the bending blocks, the frictional force can be
significantly reduced.
The worn zone of the rolls can also be compensated by the
spindle-type lifting gear unit.
The device of the invention can also be used for
intermediate roll bending in a six-high mill. Use in reversing
mills is also conceivable.
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CA 02498303 2010-01-25
Accordingly, in one aspect the present invention resides in
a device for bending the rolls in a rolling stand comprising
several rolls with the use of bending blocks, which are mounted
at the run-in end and the runout end between the roll chocks and
the housing windows and can be acted upon by control elements,
characterized by the fact that a piston-cylinder (7) is assigned
to the bending blocks (5, 5a) of one of the mill housings (6),
and a vertical positioning mechanism (10) comprising a spindle-
type lifting gear unit is assigned to the bending blocks (5',
5a') of the opposite mill housing (6').
In a more preferred aspect, the spindle-type lifting gear
unit is coupled to the bending blocks (5', 5a') and operable to
selectively adjust the spacing therebetween.
BRIEF DESCRIPTION OF THE DRAWINGS
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-- Figure 1 shows a side view section of a four-high mill
from the drive end.
-- Figure 2 shows a top view of the work roll plane of the
rolling stand in Figure 1.
In a rolling stand 1, the work rolls 3, 3a are supported by
the backup rolls 2, 2a. The chocks 4, 4a of the work rolls are
connected by the bending blocks 5, 5a, 5', 5a' with the mill
housings 6, 6'. A spindle-type lifting gear unit 10 is
installed between the bending blocks 5' and 5a' and can be
positioned and locked by a drive 12.
The bending blocks 5 and 5a are connected by a piston-
cylinder 7, whose piston 9 is supported in bending block 5a,
while its connecting rod 8 is mounted in bending block 5. The
bending blocks 5, 5a, 5' and 5a' can be connected by well-known
means with the chocks 4, 4a of the work rolls 3, 3a, on the one
hand, and the mill housings 6, 6', on the other hand.
The rolling direction of the rolling stock passing through
the mill is indicated by the double arrow 11. Flatness control
is accomplished by positioning and locking the bending blocks
51, 5a' with the spindle-type lifting gear unit, while the
piston-cylinder 7, which connects the bending blocks 5 and 5a
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CA 02498303 2005-03-09
with each other, introduces the necessary bending force.
The invention is not limited to the use of spindle-type
lifting gear units, but rather any vertical positioning
mechanism can be used, for example, wedges with restricted
guidance, a cylinder with clamping head and position sensor, or
an eccentric shaft.

Representative Drawing