Cross rolling machine

Details Cross rolling machine Cross rolling machine

1999-12-03

2001-07-31

Larson, Lowell A. (Department: 3725)

Metal deforming

By use of roller or roller-like tool-element

With carrier for roller-couple or tool-couple

C072S241400

Reexamination Certificate

active

06266988

ABSTRACT:

FIELD OF THE INVENTION AND RELATED ART STATEMENT
The present invention relates to a cross rolling machine for rolling a metal sheet by using a pair of work roll and backup roll on the top side and a pair of work roll and backup roll on the bottom side which are crossed each other.
As one means effective in controlling a sheet crown produced when a metal sheet is rolled, a cross rolling method relating to the present invention has been widely used. As one example of this cross rolling method, for example, as shown in
FIGS. 3 and 4
, a metal sheet
1001
is rolled to a predetermined thickness in a state in which work rolls
1002
and
1003
and backup rolls
1004
and
1005
are arranged vertically in the opposite sides of the metal sheet
1001
, and a pair of the work roll
1002
and the backup roll
1004
on the top side and a pair of the work roll
1003
and the backup roll
1005
on the bottom side are pair crossed each other.
Driving means for crossing the work rolls
1002
and
1003
and the backup rolls
1004
and
1005
in pairs will be described with reference to FIG.
5
. The work rolls
1002
and
1003
and the backup rolls
1004
and
1005
are arranged vertically in a housing
1006
of a rolling machine, and the metal sheet
1001
is rolled in the direction of arrow mark A (in the left-to-right direction in
FIG. 5
) from the entrance side to the delivery side.
On the rolling machine of this type, first, the pair of the work roll
1002
and the backup roll
1004
on the top side are pair crossed as follows: When the rotation of a motor (not shown) is transmitted from universal joints on the entrance and delivery sides on the top side to worm reduction gears
1016
,
1016
via connecting shafts
1017
,
1017
, screw rods
1015
,
1015
threadedly engaging with fixing nuts advance (entrance side) or retreat (delivery side) while being rotated, by which a work roll chock
1007
and a backup roll chock
1009
are pressed and moved in the direction from entrance side to delivery side at the same time via crossheads
1011
and sliding members
1012
. The crosshead
1011
is advanced by being pushed out by the screw rod
1015
, and retreated by being pulled back by a hydraulic cylinder
1018
.
Then, the pair of the work roll
1003
and the backup roll
1005
on the bottom side are pair crossed as follows: By rotating another motor (not shown) in the direction opposite to the motor for the top side, the connecting shafts
1017
, worm reduction gears
1016
, screw rods
1015
, crossheads
1011
, and other elements are operated in the direction opposite to the elements on the top side, by which a work roll chock
1008
and a backup roll chock
1010
are pushed out from the delivery side to the entrance side at the same time.
For a housing
1006
′ (not shown) on the opposite side, pair crossing is effected in the same manner as described above. Although the pair of the work roll
1002
and the backup roll
1004
on the top side and the pair of the work roll
1003
and the backup roll
1005
on the bottom side are crossed in this manner, this driving means requires a large number of operating members ranging from the motor to the crosshead and a complicated drive system. Also, the housing
1006
, which is formed with a groove for the crosshead, has low rigidity.
Next, another four-high pair cross rolling machine will be described with reference to FIG.
6
. By operating hydraulic cylinders
1019
,
1019
on the entrance and delivery sides in synchronism with each other, a work roll chock
1007
(
1008
) and a backup roll chock
1009
(
1010
) are pair crossed via crossheads
1011
and sliding members
1012
. Although, in this example, the use of the hydraulic cylinders in the drive system simplifies the operating members and drive system, it is difficult to uniformly transmit the pressing force from the hydraulic cylinders
1019
,
1019
on the entrance and delivery sides from the crosshead
1011
to the work roll chock
1007
(
1008
) and the backup roll chock
1009
(
1010
). Also, the housing
1006
has low rigidity because it is formed with a groove for the crosshead.
OBJECT AND SUMMARY OF THE INVENTION
The present invention has been made to solve the above problems, and accordingly an object thereof is to provide a cross rolling machine in which crossheads are disused, and work roll chocks and backup roll chocks are pressed directly by hydraulic cylinders, by which a complicated drive system is simplified and the number of components is reduced, the rigidity of a housing is increased, the accuracy of crossing operation is enhanced, and the economical efficiency is improved.
To achieve the above object, the present invention provides a cross rolling machine which rolls a metal sheet to a predetermined thickness in a state in which work rolls and backup rolls are arranged vertically on the opposite sides of the metal sheet, and a pair of the work roll and the backup roll on the top side and a pair of the work roll and the backup roll on the bottom side are pair crossed each other, characterized in that hydraulic cylinders engaging with the work roll chock are disposed in one set on the entrance and delivery sides each of the rolling machine, and hydraulic cylinders engaging with the backup roll chock are disposed in one set on the entrance side of the rolling machine and in two sets on the delivery side thereof.
The term “pair cross” used herein means that either or both of the top pair and the bottom pair are turned in a horizontal plane, by which the pairs are crossed each other at a predetermined angle (predetermined cross angle).
Contrary to this, the hydraulic cylinders engaging with the backup roll chock may be disposed in two sets on the entrance side of the rolling machine and in one set on the delivery side thereof.
Also, the backup roll chock may be moved to a position for positioning at a predetermined cross angle by the two sets of hydraulic cylinders disposed on the entrance or delivery side of the rolling machine, and may be pressed and fixed by the one set of hydraulic cylinder disposed on the entrance or delivery side on the other side.
Also, the configuration may be such that when the backup roll chock is moved to the position for positioning, the second hydraulic cylinders engaging with the backup roll chock are operated in synchronism with the first hydraulic cylinder engaging with the chock for the work roll paired with the backup roll.
Also, the configuration may be such that screws are disposed in place of the hydraulic cylinders for performing the positioning at the predetermined cross angle, and the positioning at the predetermined cross angle is performed by turning the screws. That is to say, the top paired chocks are moved to the position for positioning at the same time, and the bottom paired chocks are moved to the position for positioning at the same time.
The cross rolling machine in accordance with the present invention, which rolls a metal sheet to a predetermined thickness in a state in which work rolls and backup rolls are arranged vertically on the opposite sides of the metal sheet, and a pair of the work roll and the backup roll on the top side and a pair of the work roll and the backup roll on the bottom side are pair crossed each other, is also characterized in that hydraulic cylinders engaging with work roll chock are disposed in one set on the entrance and delivery sides each of the rolling machine, and hydraulic cylinders engaging with backup roll chock are disposed in two sets on the entrance and delivery sides each of the rolling machine.
The backup roll chock may be moved to a position for positioning at a predetermined cross angle by the two sets of hydraulic cylinders disposed on the entrance or delivery side of the rolling machine, and may be pressed and fixed by the two sets of hydraulic cylinders disposed on the entrance or delivery side on the other side.
Also, the configuration may be such that when the backup roll chock is moved to the position for positioning, the second hydraulic cylinders engaging with the backu

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