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
2000-03-17
2001-06-05
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
C072S007600, C072S011800, C072S202000, C072S234000
Reexamination Certificate
active
06240757
ABSTRACT:
BACKGROUND INVENTION
The present invention relates to a method and system for rolling a metal strip using a cold-rolling train, which is followed by an annealing section and a temper pass section. It is difficult to achieve the desired material hardness when working with rolling trains of this type.
SUMMARY
It is an object of the present invention to provide a method and a system by which the desired material hardness may be achieved precisely. In so doing, it is also desirable to achieve the desired value for the thickness of the metal strip at the outflow from the temper pass section.
According to the present invention, the outflow thickness, i.e., the setpoint thickness of the metal strip at the outflow from the cold-rolling train is determined as a function of the setpoint hardness and of the setpoint thickness at the outflow from the temper pass section. In this way, it is possible to achieve the desired setpoint hardness as the rolled strip runs out from the temper pass section. In this context, in one example embodiment of the present invention, the effect of the temper pass section, in particular the relationship between hardness of the metal strip and the degree of thickness reduction of the metal strip, as well as the effect of the annealing section, in particular on the material hardness, are taken into account. According to this embodiment of the present invention, taking into account the reduction in the material hardness in the annealing section, as well as the relationship between the hardness of the metal strip and the degree of thickness reduction of the metal strip in the temper pass section, the thickness of the rolled strip at the outflow from the cold-rolling train is predefined in such a way that, during the thickness reduction of the metal strip in the temper pass section to the desired setpoint thickness of the metal strip, the desired setpoint hardness is also established. According to the present invention, the precision in reaching the desired setpoint hardness of the metal strip at the outflow from the temper pass section can be improved considerably in this manner.
In another example embodiment of the present invention, the effect of the temper pass section, i.e., in particular the relationship between hardness of the metal strip and the degree of thickness reduction of the metal strip, is ascertained from the effect of the cold-rolling train, that is to say, in particular from the relationship between hardness of the metal strip and the degree of thickness reduction of the metal strip in the cold-rolling train. The modeling of the relationship between the degree of thickness reduction of the metal strip and material hardness is effected on the basis of the relationships between the degree of thickness reduction of the metal strip and material hardness at the roll stands of the cold-rolling train or at several selected roll stands of the cold-rolling train.
In another example embodiment of the present invention, the effect of the temper pass section, in particular the relationship between hardness of the metal strip and the degree of thickness reduction of the metal strip, is determined in advance, in particular by use of tensile tests.
In another example embodiment of the present invention, the ascertained effect of the temper pass section, in particular the ascertained relationship between hardness of the metal strip and the degree of thickness reduction of the metal strip, is corrected by comparing a measured value of the actual hardness with the setpoint hardness of the metal strip at the outflow from the temper pass section, along the lines of reducing the deviation between the setpoint hardness and the measured value of the actual hardness of the metal strip at the outflow from the temper pass section.
In another example embodiment, the setpoint value for the thickness, i.e., the setpoint thickness of the metal strip at the outflow from the cold-rolling train, ascertained from the effect of the temper pass section, in particular from the relationship between hardness of the metal strip and the degree of thickness reduction of the metal strip, is corrected by comparing the actual hardness and the setpoint hardness of the metal strip at the outflow from the temper pass section, along the lines of reducing the deviation between the setpoint hardness and the actual hardness of the metal strip at the outflow from the temper pass section.
Using these measures relating to precise modeling of the relationship between hardness of the metal strip and the degree of thickness reduction of the metal strip, the desired setpoint hardness is achieved particularly well. If no measured values for the hardness of the metal strip at the outflow from the temper pass section are available, then the actual values are advantageously ascertained by inverse modeling. The method according to the present invention is used particularly advantageously in achieving a constant material hardness over the entire length of the metal strip, thereby preventing scrap to a great extent.
In an advantageous embodiment of the present invention, the thickness of the metal strip is reduced by at least 10%, in particular by at least 20%, in the temper pass section. Furthermore, it is particularly advantageous to reduce the thickness of the metal strip by 20 to 40% in the temper pass section.
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Brüstle Roland
Wilke Eckhard
Kenyon & Kenyon
Siemens Aktiengesellschaft
Tolan Ed
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