Plate reduction press apparatus and methods

Details Plate reduction press apparatus and methods Plate reduction press apparatus and methods

1999-05-12

2002-01-29

Larson, Lowell A. (Department: 3725)

Metal deforming

By use of 'flying tool' engaging moving work

C072S406000

Reexamination Certificate

active

06341516

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Technical Field of the Invention
The present invention relates to a plate thickness reduction press apparatus that transfers and reduces a slab, and the methods concerned with its use.
2. Prior Art
1.
FIG. 1
shows an example of a roughing mill used for hot rolling, and the roughing mill is provided with work rolls
2
a,
2
b
arranged vertically opposite each other on opposite sides of a transfer line S that transfers a slab-like material
1
to be shaped, substantially horizontally, and backup rolls
3
a,
3
b
contacting the work rolls
2
a,
2
b
on the side opposite to the transfer line.
In the above-mentioned roughing mill, the work roll
2
a
above the transfer line S is rotated counterclockwise, and the work roll
2
b
underneath the transfer line S is rotated clockwise, so that the material
1
to be shaped is caught between both work rolls
2
a,
2
b,
and by pressing the upper backup roll
3
a
downwards, the material
1
to be shaped is moved from the upstream A side of the transfer line to the downstream B side of the line, and the material
1
to be shaped is pressed and formed in the direction of the thickness of the slab. However, unless the nip angle &thgr; of the material
1
to be shaped as it enters into the work rolls
2
a,
2
b
is less than about 17°, slipping will occur between the upper and lower surfaces of the material
1
to be shaped and the outer surfaces of both work rolls
2
a,
2
b,
and the work rolls
2
a,
2
b
will no longer be able to grip and reduce the material
1
to be shaped.
More explicitly, when the diameter D of the work rolls
2
a,
2
b
is 1,200 mm, the reduction &Dgr;t of a single rolling pass is about 50 mm according to the above-mentioned nip angle &thgr; condition for the work rolls
2
a,
2
b,
so when a material
1
to be shaped with a thickness T
0
of 250 mm is rolled, the thickness T
1
of the slab after being reduced and formed by a roughing mill becomes about 200 mm.
According to the prior art, therefore, the material
1
to be shaped is rolled in a reversing mill, in which the material is moved backwards and forwards while gradually reducing the thickness of the plate, and when the thickness of the material
1
to be shaped is reduced to about 90 mm, the material
1
is sent to a finishing mill.
Another system for reducing and forming the material
1
to be shaped according to the prior art is shown in
FIG. 2
; dies
14
a,
14
b
with profiles like the plane shape of dies for a stentering press machine are positioned opposite each other above and below a transfer line S, and both dies
14
a,
14
b
are made to approach each other and separate from each other in the direction orthogonal to the direction of movement of the material
1
using reciprocating means such as hydraulic cylinders, in synchronism with the transfer of the material
1
, while reducing and forming the material
1
to be shaped in the direction of the thickness of the plate.
The dies
14
a,
14
b
are constructed with flat forming surfaces
19
a,
19
b
gradually sloping from the upstream A side of the transfer line towards the downstream B side of the line, and flat forming surfaces
19
c,
19
d
that continue from the aforementioned forming surfaces
19
a,
19
b
in a direction parallel to and on opposite sides of the transfer line S.
The width of the dies
14
a,
14
b
is set according to the plate width (about 2,000 mm or more) of the material
1
to be shaped.
However, when the material
1
to be shaped is rolled with the reversing method using the roughing mill shown in
FIG. 1
, space is required at each of the upstream A and downstream B ends of the transfer line S of the roughing mill, for pulling out the material
1
to be shaped as it comes out of the roughing mill, so the equipment must be long and large.
When the material
1
to be shaped is reduced and formed in the direction of its plate thickness using the dies
14
a,
14
b
shown in
FIG. 2
, the areas of the forming surfaces
19
a,
19
b,
19
c
and
19
d
in contact with the material
1
to be shaped are much longer than those of the dies of a stentering press machine, and the contact areas increase as the dies
14
a,
14
b
approach the transfer line S, so that a large load must be applied to each of the dies
14
a,
14
b,
during reduction.
Furthermore, the power transmission members such as the eccentric shafts and rods for moving the dies
14
a,
14
b,
the housing, etc. must be strong enough to withstand the above reducing loads, so each of these members and the housing must be made large in size.
Moreover, when the material
1
to be shaped is reduced and formed in the direction of its plate thickness using the dies
14
a,
14
b,
some of the material
1
is forced backwards towards the upstream A side on the transfer line depending on the shape and the stroke of the dies
14
a,
14
b,
therefore, it becomes difficult to transfer the material
1
to be shaped to the downstream B side of the transfer line.
When the material
1
to be shaped is reduced and formed in the direction of its plate thickness using the dies
14
a,
14
b
shown in
FIG. 2
, the height of the lower surface of the material
1
after being reduced by the dies
14
a,
14
b
is higher than the height of the lower surface of the material
1
immediately before being reduced by the dies, by an amount corresponding to the reduction in thickness.
Consequently, the leading end of the material
1
to be shaped tends to droop downwards, therefore the table rollers (not illustrated) installed on the downstream B side of the transfer line, to support the material
1
being shaped, may catch the leading end of the material
1
, possibly resulting in damage to both the table rollers and the material
1
being shaped.
Recently, the flying-sizing press machine shown in
FIG. 3
has been proposed.
This flying-sizing press machine is provided with a housing
4
erected on a transfer line S so as to allow movement of a material
1
to be shaped, an upper shaft box
6
a
and a lower shaft box
6
b
housed in window portions
5
of the housing
4
opposite each other on opposite sides of the transfer line S, upper and lower rotating shafts
7
a,
7
b
extending substantially horizontally in the direction orthogonal to the transfer line S and supported by the upper shaft box
6
a
or the lower shaft box
6
b
by bearings (not illustrated) on the non-eccentric portions, rods
9
a,
9
b
located above and below the transfer line S, respectively, connected to eccentric portions of the rotating shafts
7
a,
7
b
through bearings
8
a,
8
b
at the end portions thereof, rod support boxes
11
a,
11
b
connected to intermediate portions of the upper and lower rods
9
a,
9
b
by bearings
10
a,
10
b
with spherical surfaces and housed in the window portions
5
of the housing
4
and free to slide vertically, die holders
13
a,
13
b
connected to the top portions of the rods
9
a,
9
b
through bearings
12
a,
12
b
with spherical surfaces, dies
14
a,
14
b
mounted on the die holders
13
a,
13
b,
and hydraulic cylinders
15
a,
15
b
whose cylinder units are connected to intermediate locations along the length of the rods
9
a,
9
b
by means of bearings and the tips of the piston rods are connected to the die holders
13
a,
13
b
through bearings.
The rotating shafts
7
a,
7
b
are connected to the output shaft (not illustrated) of a motor through a universal coupling and a speed reduction gear, and when the motor is operated, the upper and lower dies
14
a,
14
b
approach towards and move away from the transfer line S in synchronism with the transfer operation.
The dies
14
a,
14
b
are provided with flat forming surfaces
16
a,
16
b
gradually sloping from the upstream A side of the transfer line towards the downstream B side of the transfer line so as to approach the transfer line S, and other flat forming surfaces
17
a,
17
b
continuing from the aforementioned forming surfaces
16
a,
16
b
in a direction parallel to the transfer line S.
The width of the dies
14
a,
14
b
is d

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