Metal deforming – With use of control means energized in response to activator... – Metal deforming by use of roller or roller-like tool element
Patent
1995-03-29
1997-04-15
Bray, W. Donald
Metal deforming
With use of control means energized in response to activator...
Metal deforming by use of roller or roller-like tool element
72 89, 72 92, 72235, 36457103, B21B 3700
Patent
active
056198809
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
It is known from Japanese Patent Publications JP-A 62 207 509 and JP-A 57 130 712, from U.S. Pat. No. 3,811,304, German Patent Publication DE-A 3 012 526, and European Patent Publication EP-A 0 056 438, that in rolling mills to guide the rolled material in loops, at least between one part of the roll stand, and to control the loop height with loop controllers. The German Patent Publication No. DE-A 38 28 495 discloses using minimal draw controllers to control the tensile force feedback control in the rolled material between roll stands.
The object of the present invention is to provide a device for controlling the rotational speed of the rolls in view of the fact that a plurality of bars can be situated in the rolling train, simultaneously.
SUMMARY OF THE INVENTION
The present invention achieves the above mentioned object by providing a device for controlling a rotational speeds of roll stands of a rolling train for rolled material in the form of strips or bars, the device including control modules, a material position Cracking means and a setpoint selection means. Each of the control modules is assigned to a corresponding roll stand, adjusts the rotational speed of the roll stands, and includes a minimal draw controller and/or a loop controller for controlling a tension and/or a loop height of the rolled material between adjacent roll stands. The material position tracking means determines the positions of the rolled material within the rolling train. The setpoint selection means provides setpoint data to the control modules and includes a memory for storing a basic set of setpoint values and a set of rotational speed ratios for the successive stands in the rolling train, the basic set of setpoint values and the set of rotational speed ratios being based on rolling programs and roll data records. When the rolled materials run through the rolling train, the minimal draw controllers and loop controllers optimize sets of the rotational speed ratios and stores these optimized sets of rotational speed ratios in the setpoint selection means as the stored set of rotational speed ratios. For each bar running into the rolling train, a set of the optimized rotational speed ratios is transmitted to a setpoint memory assigned to the bar. Rotational speed ratios contained in the setpoint memories for bars situated in the rolling train are selected based on the positions of the rolled material within the rolling train as determined by the material position tracking means and supplied to the control modules.
The sets of rotational speed ratios may be made correctable by manual adjustments. For roll stands in an area of a gap between two successive bars, the optimized rotational speed ratios stored for the following of the two successive bars may be selected and supplied to the control modules for the respective stands. The last roll stand of the roll stands of the rolling train may be selected as a guiding stand having a predetermined rotational speed and the rotational speeds of the remaining roll stands may be controlled based on the optimized rotational speed ratios from the setpoint selection means.
In the case of a multi-strand rolling train having a defined multi-strand region, a last stand, in the direction of rolling, of the multi-strand region may act as a controlling stand, at least as long as a rolled material is in the multi-strand region. In the multi-strand region, rotational speeds of roll stands located, in each case, ahead of a loop in the direction of rolling may be controlled while in the single-strand region, rotational speeds of stands located, in each case, after the loop in the direction of rolling may be controlled. The direction of action of loop control of the single-strand region may be reversed after the rolled material exits from the controlling stand of the multi-strand region to allow the rotational speeds of the stands located, in each case, ahead of the loop in the direction of rolling to be controlled.
The present invention further provides a means for de
REFERENCES:
patent: 3181713 (1965-05-01), Abbe et al.
patent: 4099244 (1978-07-01), Galanis et al.
patent: 5305624 (1994-04-01), Backhaus
patent: 5461894 (1995-10-01), Sorgel
Bax Harald
Polster Herbert
Bray W. Donald
Siemens Aktiengesellschaft
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