Roller cooling table

Details Roller cooling table Roller cooling table

1985-08-21

1988-05-31

Combs, E. Michael

Metal deforming

By use of roller or roller-like tool-element

With modification or control of temperature of work, tool or...

266260, B21B 4304, B21B 4502

Patent

active

047472901

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a roller cooling table.
In steel pipe production, mother tube is fed into a stretch reducing mill, and the finished pipes cut into desired lengths leave the stretch reducing mill at temperatures ranging from 850.degree. C. to 1000.degree. C. approximately.
The finished pipes are then fed into a cooling table. As shown in FIG. 1 a conventional cooling table 1 consist of a horizontal array of water cooled rolls 2 onto which the hot finished pipes 3 are fed where upon the pipes 3 are rotated and transported to the exit side of the table and discharged in a straight cool condition. A typical cooling table could consist of 48 water cooled pipes 330 mm in diameter and 8.6 m in length. The roll diameters, number of rolls, length of table, speed of rotation, and flow of cooling water are chosen to achieve the desired rate of cooling for the intended range of pipe sizes and output rates.
In operation, depending upon the size of the pipes to be cooled, the pipes 1 rotate in the V-spaces 4 between adjacent rolls 2 in twos or threes and are moved one at a time into the adjacent V-spaces by an additional pipe being transported into the particular V-space.
A problem with these conventional cooling tables is that small size pipes, such as 15 and 20 mm nominal bore, do not always remain parallel and straight, but become entangled with each other and cool in a bent condition, requiring re-straightening. Thus reducing the efficiency of the operation.
The present invention seeks to ameliorate this problem by providing a roller cooling table having at least a first group of rollers at the entrance side of the table located in a generally downwardly sloping plane.
Preferably the first rollers are smaller in diameter than the remaining group of rollers.
The invention will now be described by way of example with reference to the accompanying drawings in which:
FIG. 1 shows a conventional cooling table including water-cooled rolls upon which hot finished pipes are fed.
FIG. 2 illustrates the first group of rolls of one embodiment of the present invention; and
FIG. 3 illustrates a stretch reducing mill runout of an embodiment of the present invention.
As shown in FIG. 2 the cooling table comprises interlocked castellated water cooled rolls 5, the first seven rolls 5, adjacent the kick-off table 6 are 220 mm in diameter, with the eighth roll 7 being 243 mm in diameter. These rolls are arranged in a generally downwardly sloping plane, and are followed by a horizontal array of 330 mm diameter rolls 8. The spaces 4, 4' are defined by the peripheries of adjacent rolls 5, 8 and tangent lines 25, 28, respectively, as shown in FIG. 2, V-space 4 being smaller than V-space 4'.
The sloping of the plane of the first rolls reduces the number of pipes that can be held in the V-space 4 between rolls 5 and uses gravity to assist forward pipe travel. The use of the smaller rolls in the first group of rolls adjacent the kick-off 6 from the stretch reducing mill runout further reduces the number of pipes in the V-spaces between rolls.
To allow for better control of the forward movement of the pipes in the early stages, where pipe straightening is most effective, a variable speed drive can be fitted to the rolls on the entry side of the table.
In conventional designs of the kick-off from the stretch reducing mill, hot pipes at high longitudinal speed leaving the flying cut-off after the stretch reducing mill have to be kicked off conveyor rolls in the runout and slowed to longitudinal rest by friction braking both initially on a sloping skid plate and finally in the V-space between the skid plate and the first cooling table roll. Larger pipes at lower speeds can be kicked off by the five paddles 12a and gear box drives in line with the roller cooling table 1, since little longitudinal braking is necessary. Smaller pipes at higher speeds need earlier kick-off (for which four additional paddles 12b and gear box drives were required upstream of the five aligned with the roller cooling table) to allow space for braking to

REFERENCES:
patent: 691159 (1902-01-01), Morgan
patent: 744874 (1903-11-01), Neeland
patent: 1750534 (1930-03-01), McArthur
patent: 1761199 (1930-06-01), Drake
patent: 3534575 (1970-10-01), DeCorta

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