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
2000-05-09
2001-11-06
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
C072S010400
Reexamination Certificate
active
06311532
ABSTRACT:
This application is a 35 USC 371 of PCT /DE98/01587 field Jun. 9, 1998.
FIELD OF THE INVENTION
The present invention relates to a method and a device for the reduction and/or compensation of speed drops when threading rolled stock into a roll stand whose rolling speed is controlled using a controller.
BACKGROUND INFORMATION
In a production line, the incoming strip stock causes an abrupt load In each stand on the first pass. For the roll drive, this signifies a steep increase of the moment of load. Due to the finite moment of inertia of the drive, made up of the moments of inertia of the motor, the couplings, spindles, gears and rollers, the speed of the drive drops initially. Thereafter, the speed controller brings the speed back to its setpoint. The drop in speed causes a deceleration of the incoming strip as compared to the setpoint speed predetermined in the schedule of passes, resulting in a backward slip of the material. This backward slip is expressed in the formation of a kink in the strip downstream from the stand. This kink may only be of such a magnitude that it can be controlled by the kink control and the kink lifter. The precision of the run-out thickness of the strip is also influenced.
In the case of high demands on the magnitude of the kink, primarily with short load increase times such as occur on the last stands of a production line, a standard PI speed controller is frequently not sufficiently dynamic.
SUMMARY PRESENT
An, object of the present invention is to provide a method and a device for the reduction and/or compensation of speed drops when threading rolled stock into a roll stand.
The objective is attained according to the present invention by a method and a device which considerably reduce speed drops as shown, for. example, in FIG.
3
.
The method according to the present invention is used to particular advantage for I controllers or partial subgroup controllers designed as I controllers.
It is of particular advantage to use the method according to the present invention for a speed controller. If speed control is supplemented by a load monitor, integrators being used to model the path dynamics, then the method according to the present invention is also used advantageously for the integrators or a portion of the integrators for modeling the path dynamics in the load monitor.
REFERENCES:
patent: 5103662 (1992-04-01), Fapiano
patent: 5233852 (1993-08-01), Starke
patent: 0 680 138 (1995-11-01), None
patent: 60-166115 (1985-08-01), None
Patent Abstracts of Japan, vol. 096, No. 006, Jun. 28 1996 & JP 08 033911 A (Fuji Electric Co. Ltd.), Feb. 6, 1996.
Patent Abstracts of Japan, vol. 096, No. 001, Jan. 31, 1996 & JP 07 245975 A (Toshiba corp.), Sep. 19, 1995.
Patent Abstracts of Japan, vol. 095, No. 001, Feb. 28, 1995 & JP 06 284763 A (Nagoya Kogyo Univ) Oct. 7, 1994.
Ballheimer Werner
Grüss Ansgar
Weisshaar Bernhard
BakerBotts LLP
Siemens Aktiengesellschaft
Tolan Ed
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