DE2110539C3 - Control device on a rolling mill to influence the thickness of the rolling stock - Google Patents

Description

The invention relates to a control device according to the preamble of claim 1.

Such a control device is known from AT-PS 2,555,583, for example. This well-known The device is used overall to control the thickness of rolling stock on the adjustment of the rollers, so for Adjustment of fluctuations in the thickness of the rolling stock as a result of changing influencing factors. To the The thickness control is accelerated in addition to that for fine compensation of thickness fluctuations necessary readjustment is resorted to a feedforward control, in the case of disturbance variables before the occurrence of the rolling stock is detected in the roll stand and so immediately upon entry of the rolling stock into the roll stand can be taken into account.

However, this known control device is not used to adjust the thickness of the rolling stock accordingly to change a new target value without interrupting the rolling process. The operating personnel must do this turn off the rolling mill or change the rolling speed to a very low value and then change the thickness setting of the rolls according to the new target value. With modern continuous rolling mills, however, the rear end of a front belt with the front The end of a subsequent strip is welded before it enters the rolling mill and so, in a sense, is a Rolled endless belt, so that an interruption of the rolling mill operation during the rolling of the Rolled stock would have to take place, which, apart from the reduction in the effectiveness of the rolling mill, is too obvious Leads to interference and should therefore be avoided under all circumstances.

If the thickness of the rolling stock is changed at high rolling speed, even a small one can Change in thickness or the timing of the change in thickness a large deviation of the Belt tension result, which not only results in a large proportion of the rolled strip with deviating Thickness is generated, but also a rupture of the tape can occur.

The object of the invention is therefore to create a control device for a rolling mill, with the one Adjustment of the thickness, in particular of a continuously running rolled strip, to a new target value is possible during the rolling operation at high speed without reducing the rolling speed, fluctuations in the belt tension should be avoided as far as possible.

This object is achieved according to the invention by the characterizing features of claim 1. This ensures that during the rolling process with undiminished rolling speed when Discharge from one and the same raw material reel or when processing strips that are welded together uniform thickness products of different tape thicknesses can be produced. This is an advantageous one One-man operation possible, with no particular skill for bringing about the New hiring is to be requested.

Appropriate refinements of the invention emerge from the subclaims.

In the case of endlessly welded bands, it is particularly useful, according to claim 2, the Welding seam connecting strips as an excellent area on the rolling stock for detection by means of the Detector to use. If no such weld is available, a predetermined number of revolutions of the unwinding coil as a measure of a certain strip length are used, so that the excellent area of the rolling stock according to claim 3 by a predetermined tape length is defined. Optionally, according to claim 4 to define the excellent Area on the rolling stock also has a perforation, a notch, an optical, a magnetic or a radioactive marking may be provided, the corresponding by a photoelectric detector, a Bandwidth detector, magnetic detector, or radiation detector is detected. To the Improving the reliability of the detection can have two or more different detector systems Design can be combined with each other.

In the figure of the drawing, one is preferred

Embodiment of the invention illustrated schematically on a rolling mill having five stands and is described below.

A marked area on the rolling stock detecting detector 1 delivers a pulse to a preset counter 14 when the marked area passes the detector 1 Pulse generator 9,10,11,12 and 13 are on a scanning roller 2 at the inlet of the first roll stand 3 and on the drive shafts of the work rolls of all roll stands 3, 4, 5 and 6 with the exception ass last roll stand 7 mounted and each provide the number of revolutions of the cam 2 and the work rolls of the roll stands 3, 4, 5 and 6 pulses corresponding to preset counters 14,15, 16, 17 and 18. A value calculated by a correcting computer 19 and expressed by the equation k = I \ Ν \ Ιπ Rd is preset in the preset counter 14, where h is the distance between the detector 1 and the first roll stand 3, N \ die Number of pulses per revolution of the follower roller 2 and Rd denotes the diameter of the follower roller 2 .

In addition, a value expressed by the equation * = I _n NJn R _n {\ + f ") is stored by the computer 19 in each of the preset counters 15 to 18, where /" is the distance between adjacent roll stands, N _{n is} the number of pulses each Revolution of the work roll, R _n the diameter of the work roll and f " the slip in the forward direction.

After receiving a control pulse to initiate counting, each preset counter 14 to 18 begins counting pulses generated by the assigned pulse generator 9 to 13, and if the preset counter has a predetermined preset value preset by the computer 19 corresponding to a certain number of Has counted or reached pulses, a pulse is delivered while the preset counter 14 is its Initiates counting depending on the pulse emitted by detector 1, the preset counters 15 to 18 due to the pulses emitted by the previous preset counters in operation set, which are generated when the respective preset value in the preceding preset counter is reached isL

Furthermore, a program memory 20 is provided in which the rolling plans of the respective roll stands for the next thickness are stored by an independent computer or by hand. These Stored rolling plans are dependent on the output signals of the relevant preset counters transferred to the setting device for the respective roll stands.

After the end of a rolling process, the settings of the relevant preset counters 14 to 18 are made and the program memory 20 modified for the next rolling run.

1 sheet of drawings

Claims (4)

Patent claims: 1. Control device on a rolling mill to influence the thickness of the rolling stock with at least a rolling stand having work rolls, with a detector at the rolling mill inlet Determining an excellent area is arranged on the rolling stock and one from Follower roller, pulse generator and preset counter existing device for determining the running time of the Rolling stock is provided between the detector and the downstream rolling stand, characterized in that that on all existing roll stands (3 to 6) with the exception of the last roll stand (7) each pulse generator (10 to 13) are in drive connection with one of the work rolls, which Preset counters (15 to 18) are assigned, which generate the pulses according to the upstream Preset counter (14 to 17) including the preset counter (14) acted upon by the detector (1) evaluate that a computer (19) is provided, which the preset values for the individual preset counters (14 to 18) depending on the distance between adjacent roll stands or between the detector (1) and downstream roll stand (3), the diameter of the work rolls or the scanning roller, the number of pulses per revolution of the work rolls or the scanning roller and the Slippage calculated, and that a program memory (20) is provided which is dependent on the Output signals of the individual preset counters (14 to 18) preset setting values for the assigned Releases rolling stands. 2. Apparatus according to claim 1, characterized in that the detector (1) as excellent Area on the rolling stock establishes a weld seam of two strip sections connected to one another. 3. Apparatus according to claim I, characterized in that the detector (IJ as excellent Area on the rolling stock is defined by a predetermined length of the rolling stock to be rolled determines the number of revolutions of a discharge coil for the rolling stock detected area. 4. Apparatus according to claim 1, characterized in that the detector (1) as excellent Area on the rolling stock has a perforation, a lateral notch, an optical, a magnetic or detects a radioactive label.