Metal deforming – With use of control means energized in response to activator... – Metal deforming by use of roller or roller-like tool element
Reexamination Certificate
2000-01-14
2001-04-17
Tolan, Ed (Department: 3725)
Metal deforming
With use of control means energized in response to activator...
Metal deforming by use of roller or roller-like tool element
C072S009200, C072S011500, C072S011800, C072S365200
Reexamination Certificate
active
06216504
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a gauge-alteration-in-rolling method of, when continuously rolling materials-to-be-rolled by a cold tandem rolling mill, altering set values from for the preceding material to for the succeeding material, and more particularly, to a gauge-alteration-in-rolling method in a cold tandem rolling mill, which is capable of realizing a high accuracy in gauge immediately after the gauge-alteration-in-rolling point passing.
BACKGROUND ART
At the time of the gauge-alteration-in-rolling in the cold tandem rolling mill, generally a gauge-alteration-in-rolling amount (a roll gap-alteration amount and a rolling speed-alteration amount) of each of the stands is calculated in advance, during rolling a preceding material, using an estimated rolling load value and an estimated forward slip value, which are obtained by path schedules of the preceding and the succeeding material, a set value of tension between stands, an estimated deformation resistance value, an estimated friction coefficient value, and the like.
On this occasion, there has been proposed a method of, when detectors for measuring the rolling results are available, modifying the gauge-alteration-in-rolling amount using thus obtained rolling results.
For example, there has been known a method of, when a gauge detector is provided on an inlet side of the rolling mill, modifying the roll gap-alteration amount of a first stand using a mother material gauge measured by the inlet side gauge detector. Also, there has been known a method of, when detectors for measuring the rolling load, the tension between the stands, the rolling speed, and the stand outlet side gauge are disposed at a preceding stand, modifying a gauge-alteration-in-rolling amount at a succeeding stand using the rolling results of the preceding stand detected by these detectors.
These methods intend for modifying, using the rolling results, the setting errors of a gauge-alteration-in-rolling amount which results from various wrong estimation carried out for the materials-to-be-rolled.
However, only modifying the gauge-alteration-in-rolling amount using the measured mother material gauge like the former method disables the setting errors resulting from difference in material property of the materials-to-be-rolled, such as a deformation resistance error, to be modified.
Further, according to the latter method of modifying the gauge-alteration-in-rolling amount of the succeeding stand using the rolling results of the preceding stand, calculating the difference in material property of the material-to-be-rolled by some methods using the rolling results, and then modifying the gauge-alteration-in-rolling amount of the succeeding stand using the above calculated material-wise error causes the leading end portion of the succeeding material to be controlled in gauge deviation, which, however, provides the following problems:
For example, when modifying, between the i-th stand and the next (i+1)-th stand, the gauge-alteration-in-rolling amount of the (i+1)-th stand using the results of the i-th stand, the gauge of the leading end portion of the succeeding material exposed at the (i+1)-th stand gets nearer to a desired value as shown by the arrow A in FIG.
7
. However, when an AGC (automatic gauge control) of the i-th stand is turned on after the gauge-alteration-in-rolling point B passes through the i-th stand, and hence the gauge deviation, resulting from the wrong setting at the time of the gauge-alteration-in-rolling at the i-th stand, gets nearer to a desired value as shown by the arrow C, the (i+1)-th stand outlet side gauge, which should get nearer to the desired value as shown by the arrow D unless there were no modification, shown by the arrow A, due to the rolling results of the i-th stand, comes off adversely from the leading end portion, as shown by the arrow E, due to the modification shown by the arrow A. This, until the AGC of the (i+1)-th stand is turned on and hence the (i+1)-th stand outlet side gauge returns to the desired value as shown by the arrow F, reversely increases the gauge deviation, which undesirably provides the off gauge.
DISCLOSURE OF THE INVENTION
The present invention has been made in order to solve the above-mentioned prior art problems. It is therefore an object of the invention to realize a high accuracy in gauge immediately after the gauge-alteration-in-rolling point passing.
The present invention provides a gauge-alteration-in-rolling method of altering, when continuously rolling materials-to-be-rolled by the cold tandem rolling mill, altering set values from for a preceding material to for a succeeding material, characterized in that modifying, using the rolling result (a rolling load, a stand inlet and a stand outlet side tension, a rolling speed, etc.) obtained when a leading end portion of the succeeding material passes through the i-th stand and the gauge results of the leading end portion of the succeeding material detected by the i-th stand outlet side gauge detector, set values of a gauge-alteration-in-rolling amount at the next (i+1)-th stand and subsequent stands (a roll gap-alteration amount and a rolling speed-alteration amount); and tracking the gauge results of the leading end portion of the succeeding material on the i-th stand outlet side up to the (i+1)-th stand, to thereby control the rolling speed at the i-th stand so as to make constant a mass-flow from the leading end portion of the succeeding material on the (i+1)-th stand inlet side. This enables the above-mentioned problem to be solved.
REFERENCES:
patent: 5809817 (1998-09-01), Ginzburg
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patent: 6-15318 (1994-01-01), None
patent: 6-154829 (1994-06-01), None
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patent: 7-185627 (1995-07-01), None
patent: 8-112608 (1996-05-01), None
Hattori Satoshi
Kurakake Hiroshi
Saito Yutaka
Tsuchida Hisashi
Kawasaki Steel Corporation
Oliff & Berridge PLC.
Tolan Ed
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