JPH0616894B2 - Rolling mill speed controller - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention includes a vertical roll and a horizontal roll, and rolls a bar having a different thickness, which is a material to be rolled with different thicknesses at the leading end and the trailing end. The present invention relates to a speed control device for a machine.

[Technical background of the invention and its problems]

Recently, in rolling equipment, a method of rolling a so-called differential thickness bar in which the thickness of the front end portion and the rear end portion of the rolled material is changed has been adopted. On the other hand, as a speed control method of a rolling mill when rolling a rolled material having a normal uniform thickness in a rolling facility that combines vertical rolls and horizontal rolls, the backward movement rate of the horizontal rolls is set to a constant value, A method of calculating the rotation speed of a vertical roll from the rotation speed and the backward movement rate of the horizontal roll is known.

However, when rolling a bar having a different thickness, the backward movement rate of the horizontal roll also changes because the thickness of the rolled material changes during rolling.
Therefore, as in the case of rolling a rolled material having a uniform thickness as described above, the control in which the backward movement rate of the horizontal roll is constant impairs the speed balance between the vertical roll and the horizontal roll, so that good rolling cannot be performed. Since the difference thickness bar is generally thin at the front end and thicker as it gets closer to the rear end, if the control to keep the output side plate thickness of the horizontal roll constant is performed, the backward movement rate of the horizontal roll becomes closer to the rear end. Increase. For this reason, the horizontal roll entry side rolling material speed decreases as the horizontal roll rolls the differential thickness bar, but in the conventional control that keeps the reverse rate of the horizontal roll constant, the rotation speed of the vertical roll is also kept constant. However, there is a problem that excessive stress occurs in the differential thickness bar between the vertical roll and the horizontal roll.

[Object of the Invention]

The present invention has been made to solve such a problem, by a rolling mill equipped with a vertical roll and a horizontal roll, stable rolling in the case of rolling a differential thickness bar having a different thickness of the tip portion. An object of the present invention is to provide a speed control device for a rolling mill capable of controlling the speed of rolls.

[Outline of Invention]

The present invention is a rolling mill equipped with a vertical roll and a horizontal roll, which rolls a differential thickness bar which is a material to be rolled having different thicknesses at the leading end and the trailing end, and a calculation for calculating the advance rate f of the horizontal roll. Circuit, a detection circuit for detecting the output side plate thickness h of the horizontal roll, a detection circuit for detecting the input side plate thickness H of the horizontal roll, a detection circuit for detecting the rotation speed v of the horizontal roll, and an advanced rate data from the arithmetic circuit. f is input, and output side plate thickness data h, input side plate thickness data H, and rotation speed data v are input from each detection circuit, and (1 + f) · h · 1
A calculation device for calculating the rotation speed of the vertical roll by calculating / H · v, and a vertical roll rotation speed control device for controlling the rotation speed of the vertical roll based on the rotation speed data obtained by this calculation device. It is provided. And the present invention, by providing such a configuration, during the rolling of the differential thickness bar, the vertical roll is controlled to rotate at an appropriate speed, and excessive stress is generated in the differential thickness bar between the vertical roll and the horizontal roll. This is something that can be prevented.

Example of Invention

 Embodiments of the present invention will be described below with reference to the drawings.

In the figure, reference numeral 1 denotes a differential thickness bar having a thin leading end and a thick rear end, and the differential thickness bar 1 is rolled through a vertical roll 2 and a horizontal roll 3 in sequence. The vertical roll 2 is rotated by a vertical roll driving electric motor 4.
The rotation speed of the electric motor 4 is controlled by the vertical roll rotation speed control device 5. The vertical roll rotation speed control device 5 controls the rotation of the electric motor 4 according to the speed reference data from the vertical roll rotation speed reference calculation device 6.

Reference numeral 7 in the drawing is a horizontal roll advanced ratio calculation circuit, which calculates the leading end ratio f of the horizontal roll 3 and supplies the data to the vertical roll rotation speed reference calculation device 6. Reference numeral 8 denotes a horizontal roll delivery side plate thickness detection circuit, which detects the delivery side plate thickness h of the horizontal roll 3 and supplies the detection data to the vertical roll rotation speed reference calculation device 6. Reference numeral 9 denotes a horizontal roll entrance side plate thickness detection circuit, which detects the entrance side plate thickness H of the horizontal roll 3 and supplies the detection data to the vertical roll rotation speed reference calculation device 6. 10 is a horizontal roll rotation speed detection circuit,
The detection circuit 10 detects the rotation speed v of the horizontal roll 3 and supplies the data to the vertical roll rotation speed reference calculation device 6.

The vertical roll rotation speed reference calculation device 6 includes an adding circuit 1
1, a multiplying circuit 12, a dividing circuit 13, and a multiplying circuit 14 are built in, the advanced rate data f from the horizontal roll advanced rate calculating circuit 7 is input to the adding circuit 11, and the side plate thickness detecting circuit in the horizontal roll. The output side plate thickness data h from 8 is input to the multiplication circuit 12, the input side plate thickness data H from the horizontal roll input side plate thickness detection circuit 9 is input to the division circuit 13, and the horizontal roll rotational speed detection circuit is also input. The rotation speed data v from 10 is input to the multiplication circuit 14. The addition circuit 11 receives the advanced rate data f and performs the addition process of (1 + f), and the multiplication circuit 12 receives the output side plate thickness data h and the addition data of (1 + f) from the addition circuit 11 (1 + f). -The multiplication processing of h is performed. The division circuit 13 receives the input side plate thickness data H and the multiplication data of (1 + f) · h from the multiplication circuit 12 to perform a division process of (1 + f) · h · 1 / H, and the multiplication circuit 14 outputs the rotation speed data. From v and division circuit 13 (1
+ F) ・ h ・ 1 / H data is input (1 + f) ・
The multiplication processing of h · 1 / H · v is performed. This calculation process is performed based on this formula because the following formula is established in this type of rolling mill. That is, H · B · v · (1-b) = h · B · v · (1 + f) ...
(1) where B is the width of the rolled material, and b is the backward movement rate of the horizontal roll.

From the formula (1), the rotation speed v · (1 + b) of the vertical roll 2 is v · (1 + b) = (1 + f) · h · 1 / H · v.
(2) The calculation of the equation (2) is performed by the vertical roll rotation speed reference calculation device 6.

Output from the multiplication circuit 14 of the arithmetic unit 6 (1+
f) · h · 1 / H · v speed reference data is supplied to the vertical roll rotation speed control device 5.

In the apparatus according to the embodiment of the present invention configured as described above, even when the entrance side plate thickness H of the horizontal roll 3 changes during rolling of the differential thickness bar 1, the vertical roll rotation speed reference calculation device 6 always performs
Since the formula (2) is calculated, the vertical roll drive motor 4 is always controlled to rotate at an appropriate vertical roll rotation speed reference,
The vertical roll 2 is rotationally driven at an appropriate speed. Therefore, during rolling of the differential thickness bar 1, excessive stress is not generated between the vertical roll 2 and the horizontal roll 3, and stable and favorable rolling can be performed on the differential thickness bar 1.

In the above embodiment, the vertical roll rotation speed reference arithmetic unit is provided with the addition circuit 11, the multiplication circuit 12, the division circuit 13 and the multiplication circuit 14, and the arithmetic processing is performed by the addition circuit 11, the multiplication circuit 12, the division circuit 13 and the multiplication circuit. Although the operation sequence is performed in the order of 14, the operation sequence may be performed in any order other than the first adder circuit 11 by the rotation.

[Effects of the Invention] According to the present invention as described in detail above, in the case of rolling a differential thickness bar having different thicknesses at the leading end and the trailing end by a rolling mill provided with vertical rolls and horizontal rolls. In the above, it is possible to provide a speed control device for a rolling mill capable of controlling the speed of rolls so that stable and favorable rolling can be performed.

[Brief description of drawings]

The drawing is a block diagram showing an embodiment of the present invention. 1 ... Differential thickness bar, 2 ... Vertical roll, 3 ... Horizontal roll,
4 ... Vertical roll drive motor, 5 ... Vertical roll rotation speed control device, 6 ... Vertical roll rotation speed reference calculation device, 7 ...
… Horizontal roll advanced ratio calculation circuit, 8… Horizontal roll side plate thickness detection circuit, 9… Horizontal roll entrance side plate thickness detection circuit, 10
...... Horizontal roll rotation speed detection circuit.

Claims (1)

[Claims] 1. A rolling mill equipped with a vertical roll and a horizontal roll for rolling a differential thickness bar which is a material to be rolled having different thicknesses at a leading end portion and a trailing end portion, and An arithmetic circuit for performing arithmetic operation, a detection circuit for detecting an outgoing side plate thickness h of the horizontal roll, a detection circuit for detecting an incoming side plate thickness H of the horizontal roll, and a detection circuit for detecting a rotation speed v of the horizontal roll, The advanced rate data f is input from the arithmetic circuit, and the output side plate thickness data h, the input side plate thickness data H, and the rotation speed data v are input from each of the detection circuits, and (1 + f) · h · 1 / H · v And a vertical roll rotation speed control device that controls the vertical roll rotation speed based on the rotation speed data obtained by this calculation device. It is characterized by Mill speed control device that.