High speed finishing block

Details High speed finishing block High speed finishing block

2001-07-24

2003-04-15

Larson, Lowell A. (Department: 3725)

Metal deforming

By use of roller or roller-like tool-element

Plural roller-couples

C072S249000

Reexamination Certificate

active

06546776

ABSTRACT:

BACKGROUND DISCUSSION
1. Field of the Invention
This invention relates generally to rolling mills, and is concerned in particular with an improvement in the finishing blocks of high speed rod rolling mills.
2. Description of the Prior Art
Referring initially to
FIG. 1
, a conventional high speed finishing block
10
is shown positioned on a mill pass line P
L
. Product P
R
is received at the low speed entry end E of the block and exits from the block at the high speed delivery end D. The block is powered from the delivery end via a gear-type speed increaser
12
and a drive motor
14
.
The block includes a succession of roll stands
16
a
-
16
h
alternately staggered on opposite sides of the mill pass line P
L
. The roll stands have cantilevered pairs of work rolls
18
alternately offset by 90° in order to effect twist free rolling of products. The successive roll stands on each side of the pass line are mechanically coupled one to the other and to the speed increaser
12
by parallel line shafts comprising coaxial line shaft segments
20
interconnected by gear-type couplings
22
.
The successive roll stands
16
a
-
16
h
are connected to respective line shaft segment
20
by bevel gears sets
24
a
-
24
h
. A shown by the plot line “x” in
FIG. 2
, the gear ratios of the successive bevel gear sets are designed to provide stepped increases in their pitch line velocities. The stepped increases are selected to keep pace with the progressively increasing speed of the product being rolled through the block. With this arrangement, the maximum attainable operating speed of the block is limited by the maximum pitch line velocity that can be designed into the bevel gear set of the last operating stand in the block, which in this case is the bevel gear set
24
h
of the stand
16
h
.
Thus, for example, if the block is rolling a 7 mm round out of stand
16
h
at a rate of
120
to 130 tons per hour, and if the last two stands
16
g
and
16
h
are then “dummied” by removing their respective work rolls
18
in order to roll a larger 9 mm round out of stand
16
f
, the maximum obtainable tonnage rate remains the same because the bevel gear sets of the dummied stands remain connected to the mill drive. Moreover, although the dummied stands
16
g
and
16
h
are now unloaded, since they continue to be driven off of the line shafts, their bearings, seals, etc. continue to wear.
There exists a need, therefore, for an improved finishing block in which roll stands can be selectively dummied to progressively increase product size, with the dummied stands being completely uncoupled from the mill drive, and with the mill drive arranged such that rolling speeds can be increased progressively to increase the tonnage rate of the larger products being rolled.
A finishing block capable of achieving these objectives in accordance with the present invention will now be described with reference to the accompanying drawings, wherein:


REFERENCES:
patent: 3595055 (1971-07-01), Rohde
patent: RE28107 (1974-08-01), Wilson et al.
patent: 4129023 (1978-12-01), Sieurin
patent: 4537055 (1985-08-01), Woodrow et al.
patent: 5152165 (1992-10-01), Shore et al.
patent: 5595083 (1997-01-01), Shore
patent: 5673584 (1997-10-01), Kuroda et al.
patent: 6053022 (2000-04-01), Shore
patent: 6134930 (2000-10-01), Shore et al.

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