Measuring and testing – Dynamometers – Responsive to force
Reexamination Certificate
2000-01-10
2001-09-18
Noori, Max (Department: 2855)
Measuring and testing
Dynamometers
Responsive to force
C073S160000
Reexamination Certificate
active
06289750
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a method and a device for measuring the tensile stress distribution in a metal strip between two roll stands or between a roll stand and a coiler (winder). In addition, the present invention can be used in conjunction with S rolls and blooming-mill stands.
BACKGROUND INFORMATION
During the rolling of metal strips, in particular during cold rolling, the tensile stress distribution in the metal strip, along the metal width, has to be determined on line i.e., it usually has to be measured, since the tensile stress distribution is the decisive variable for controlling the flatness of the metal strip.
For example, metal metal strip is guided over a measuring roll, i.e., a segmented guide roll, which has piezoelectric pressure sensors at intervals of about 2-5 cm. The force acting on the sensors in this case is a measure of the tensile stress distress distribution. The method involves contract—and can therefore leave behind impressions in the metal and, in addition, involves wear and is thus maintenance intensive.
Furthermore, German Patent No. 26 17 958 describes a device for measuring the tensile stress of a metal strip, oscillatory waves being generated in the metal strip using electric hammers, and their propagation being measured. This method is also subject to the disadvantages mentioned above.
Furthermore, German Patent No. 31 30 572 describes the operation of measuring the tensile stress of a metal strip using ultrasound. To this end, the metal strip is made to oscillate using ultrasound, and the propagation of this oscillation is measured. However, it has been shown that this method is suitable only in exceptional cases, in particular in the case of particularly thin metal strips, because of the low energy transmission when ultrasound is used.
U.S. Pat. No. 3,538,756 descries a system in which a constant stream of air is blown against the metal strip in order to push the latter away for the purpose of achieving a deflection of the metal strip.
SUMMARY
An object of the present invention is to provide a device for avoiding the disadvantages described above.
The device according to the present invention for measuring the tensile stress distribution in a metal strip between two roll stands, between a roll stand and a coiler, in a blooming-mill stand or upstream or downstream of a guide roll has a deflection device (arranged upstream or downstream of a roll) for deflecting the metal strip, a measuring device for measuring the deflection of the metal strip and a computing device for calculating the tensile stress distribution as a function of the deflection of the metal strip, the deflection device being designed as a suction device to apply suction to the metal strip. This device, on the one hand, makes it possible to measure the tensile stress or tensile stress distribution without damaging the metal strip and, on the other hand, supplies a particularly strong and precise measurement signal, which permits particularly precise determination of the tensile stress or tensile stress distribution in the metal strip. The device according to the present invention is also considerably more straightforward and cost-effective than a measuring roll.
REFERENCES:
patent: 3538765 (1970-11-01), Jesinghaus et al.
patent: 3718034 (1973-02-01), Swearingen
patent: 3743197 (1973-07-01), Hawkins
patent: 3850031 (1974-11-01), Schwenzfeier et al.
patent: 3902644 (1975-09-01), Bous
patent: 4602475 (1986-07-01), Piesczek
patent: 4711133 (1987-12-01), Berglund
patent: 1 573 712 (1970-05-01), None
patent: 2 030 409 (1971-02-01), None
patent: 26 17 958 (1976-11-01), None
patent: 31 30 572 (1982-03-01), None
patent: 0 064 216 (1982-11-01), None
Baumann Joachim
Berghs Andre
Beyfuss Martin
Türk Felix
Kenyon & Kenyon
Noori Max
Siemens Aktiengesellschaft
LandOfFree
Device for measuring tensile stress distribution in a metal... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for measuring tensile stress distribution in a metal..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for measuring tensile stress distribution in a metal... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2533497