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
1998-12-15
2001-04-24
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
C072S011800, C072S011900, C072S365200
Reexamination Certificate
active
06220068
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a method and device for reducing the edge drop of a rolled strip in a roll train.
BACKGROUND INFORMATION
During the rolling of metal strips, because of the mechanical properties of roll stands and the flow properties of the rolled metal, so-called edge drop occurs, i.e., a flattening of the rolled strip at the edges. It is known e.g., from Japanese Patent Application No. 08 155 517 and from article “development of accurate control techniques of strip shop and edge-drop in cold rolling,” Journal of the Iron and Steel Industry of Japan, Vol. 79, No. 3, 1993, pp. 388-94, to counteract the edge drop by means of so-called tapered rolls. To this end, the working rolls are curved in a suitable way. For a particularly precise driving of the so-called tapered rolls, the edge drop is measured upstream and downstream of the appropriate roll stand. However, these measurements are expensive, in particular when they have to be carried out for a plurality of roll stands. A further problem in the known method for reducing the edge drop is that the measures for reducing the edge drop must not lead to an impermissibly high tension in the edge region of the rolled strip nor to wavy edges. If the permissible tension in the edge region of the rolled strip is exceeded, then this can lead to an impermissible reduction in the quality of the rolled strip. In order to avoid this, in the case of the conventional method for reducing the edge drop, according to Japanese Patent Application No. 62 192 205, provision is made to measure the strip tension in the edge region of the rolled strip.
SUMMARY OF THE INVENTION
An object of the present invention is to provide method and device for circumventing the abovementioned disadvantages.
According to the present invention, measuring device for measuring the edge drop is dispensed with. Furthermore, using the roll gap model it is possible to calculate the tension relationships in the roll strip, that an expensive measurement of the tension relationships for monitoring is not necessary. In addition, the method according to the present invention can advantageously be combined with flatness regulation or flatness control. The roll gap model moreover permits the edge drop to be calculated in advance, so that if appropriate necessary presettings can be made.
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S. Wilmotte et al., “New approach to computer setup of the hot strip mill,” Iron and Steel Engineer, Sep. 1977, pp. 70-76.
A. Adachi et al., “Crown reduction on hot strip rolling by taper crown rolls,” Iron and Steel Engineer, Jun. 1991, pp. 43-49.
H. Yamamoto et al., “Development of Accurate Control Techniques of Strip Shape and Edge-drop in Cold Rolling,” Journal of the Iron and Steel Institute of Japan, No. 3, Vol. 79, Jan. 1993, pp. 156-162.
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Brüstle Roland
Wilke Eckhard
Siemens AG
Tolan Ed
LandOfFree
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