Universal rolling mill

Details Universal rolling mill Universal rolling mill

2000-07-21

2001-03-20

Butler, Rodney A. (Department: 3725)

Metal deforming

By use of roller or roller-like tool-element

Included in roller-cluster

C072S239000

Reexamination Certificate

active

06202464

ABSTRACT:

TECHNICAL FIELD
The present invention relates to a universal rolling mill used in manufacturing section steel such as H-shapes. In particular, the invention relates to a universal rolling mill having width-variable rolling rolls. The width-variable rolling roll has a horizontal roll body divided into two parts and a gap between both the parts is changed to vary a rolling width.
BACKGROUND ART
In rolling a section steel, and especially the H-shapes, the universal rolling mill in which a pair of upper and lower horizontal rolls and a pair of right and left vertical rolls are incorporated into the same stand is used in general.
FIG. 1
shows rolling of an H-shapes. An H-shapes
1
is rolled by using vertical rolls (upright rolls)
7
,
7
′ and horizontal rolls
45
,
45
′. A flange width
101
of the H-shapes
1
can be varied freely in a range of a roll body length
106
of the vertical rolls
7
,
7
′. On the other hand, a web height
102
(
h
) is determined by h=W+2t
1
, where t
1
is a flange thickness
103
and W is a roll body length
104
of the horizontal rolls
45
,
45
′. Therefore, by a set of horizontal rolls with a constant width, only a size of the web height can be selected.
As the H-shapes, there is so-called H-shapes with constant outer dimensions that has a constant web height (web outer width) h. The H-shapes with the constant outer dimensions includes H-shapes with various flange thicknesses for the same nominal dimensions. For example, if the nominal dimensions are the web height: 600 mm×the flange width: 200 mm, the flange thickness is in a range of 12 to 28 mm. Therefore, it is necessary to properly vary a rolling width
105
(W
1
) according to the flange thickness. To adapt to change in the rolling width of the rolls, it is necessary to frequently replace the rolls. By frequently replacing the rolls, productivity is degraded. A large number of man-hours are necessary for the replacement and it is necessary to possess a large number of rolls.
To solve the above problems, there are width-variable rolling rolls proposed in Japanese Patent Publication No. 7-102365. A sectional view of an essential portion of the upper width-variable rolling roll is shown in
FIG. 2. A
roll body
10
is divided into a driving-side roll body
10
a
and an operating-side roll body
10
b
. The driving-side roll body
10
a
and the operating-side roll body
10
b
move relatively to each other along a direction of roll shafts and can move closer to and away from each other. Through a hollow strong portion of an operating-side roll shaft
11
b
to which the operating-side roll body
10
b
is fixed, a driving-side roll shaft
11
a
to which the driving-side roll body
10
a
is fixed is inserted and fitted. One of both the roll shafts can be inserted into and withdrawn from the other in the roll shaft direction and both the roll shafts can rotate synchronously. The driving-side roll shaft
11
a
and the operating-side roll shaft
11
b
are supported respectively by a driving-side roll chock
3
and an operating-side roll chock
4
functioning as bearings. An operating-side slide block
19
rotation of which is restrained and which can slide only in the direction of the roll shafts is mounted through a thrust bearing
17
to an operating-side shaft end of the operating-side roll shaft
11
b
. On the other hand, a push-in shaft
20
is disposed to be adjacent to a driving-side shaft end of the operating-side roll shaft
11
b
and a driving-side slide block
24
is mounted through a thrust bearing
21
to the push-in shaft
20
. A screw block
25
for synchronous rotation is fastened to the driving-side slide block
24
. To the screw block
25
, a screw
27
with a pitch P
1
and a screw
28
with a pitch 2P
1
which have the same thread direction as each other are provided. The screw
27
is screwed to a fixed screw block (fixed screw ring
26
) rotation and movement of which are restrained. The screw
28
is screwed to the above operating-side slide block
19
.
Torque is transmitted from the driving-side roll shaft
11
a
to the operating-side roll shaft
11
b
through a feather key
16
, for example.
A claw ring
30
is fitted into a notch groove
29
at an end portion of the driving-side slide block
24
. A speed reducer
31
and an electric motor
32
are connected to the claw ring
30
. When the electric motor
32
operates, the screw block
25
rotates. Because the screw block
25
is screwed to the fixed screw ring
26
, the screw block
25
moves in the roll shaft direction. Because the driving-side slide block
24
fastened to the screw block
25
and the push-in shaft
20
move synchronously, the driving-side roll shaft
11
a
can move toward a driving side in the roll shaft direction (in a direction shown by an arrow
110
). However, because the push-in shaft
20
is in contact with the driving-side roll shaft
11
a
only through a spherical face
111
, a push-in device is used separately to move the driving-side roll shaft
11
a
toward an operating side in the roll shaft direction (in a direction reverse to the direction of the arrow
110
). On the other hand, the operating-side slide block
19
connected to the screw block
25
through the screw
28
cannot rotate and can slide only in the roll shaft direction. Therefore, the slide block
19
moves in the shaft direction in a reverse direction to movement of the screw block
25
due to rotation of the screw block
25
. For example, when the screw block
25
moves toward the driving side by a distance corresponding to a pitch P
1
of the screw
27
, the operating-side slide block
19
moves toward the operating side by a distance corresponding to a pitch 2P
1
of the screw
28
, which results in movement of the operating-side roll body
10
b
by a distance corresponding to the pitch P
1
toward the operating side. In other words, with a turn of the screw block
25
, the respective driving-side and operating-side roll bodies
10
a
and
10
b
move by distances corresponding to P
1
in the reverse directions to each other without changing centers of the rolls. Therefore, it is possible to freely change a rolling width
105
of the horizontal rolls without changing the roll centers.
Here, a seal
33
is a scale seal for preventing scales or water from entering a gap between the driving-side roll body
11
a
and the operating-side roll body
11
b.
In other words, effects of the technique disclosed in Japanese Patent Publication No. 7-102365 are as follows.
a) A roll width can be varied on-line, by remote control, and arbitrarily.
b) Because the roll width can be varied such that the rolls are shifted rightward and leftward respectively by the same distance from the roll center, the technique can be easily applied to tandem mills.
c) Even if the rolls are worn, products with constant dimensions can be obtained by varying the width.
d) Products with different sizes can be produced without replacing the rolls.
FIG. 3
is an explanatory view of an essential portion of a universal rolling mill having the above width-variable rolling rolls. A reference numeral
1
designates H-shapes as material to be rolled,
2
,
2
′ designate a width-variable rolling rolls,
3
,
3
′ designate driving-side roll chocks,
4
,
4
′ designate operating-side roll chocks,
5
,
5
′ designate spindle couplings for connecting horizontal rolls to a driving device,
6
,
6
′ respectively designate downstroking and upstroking screws,
7
,
7
′ designate upright rolls (vertical rolls),
8
,
8
′ designate upright roll chocks, and
9
,
9
′ designate support boxes.
The support box
9
(and
9
′, similarly) has a structure divided into a support box
9
a
bolted to the operating-side roll chock
4
and a support box
9
b
joined to the support box
9
a
as shown in FIG.
2
. The above rolling width varying device is incorporated into the support box. In the support box
9
b
, a rolling width varying driving portion (hereafter simply referred to as “a driving port

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