JPH03297511A - Method for preventing meandering of material to be rolled on roughing mill - Google Patents

Abstract

PURPOSE:To properly prevent the meandering of the material to be rolled by detecting the horizontal load of width direction received with a pair of vertical rolls with the two load detectors, calculating the difference of the horizontal load detected and controlling the roll gap of left and right based on the computed difference. CONSTITUTION:The horizontal and width directional load working to the driving side 1a and the free side 1b of the vertical rolls set on the rear surface of the rolling mill are respectively detected with the load cells 2a, 2b, and the detected load signals are sent to the computing element 4 with the horizontal load detector 3. By calculating the difference with the above element 4 which calculates the difference of the two load signals sent from the horizontal load detector 3, based on the calculated difference, the leveling controller 5 controls the leveling of the horizontal roll 6. Therefore, the meandering of the material to be rolled on the roughing mill can be prevented properly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for preventing meandering of a rolled material during rolling of the material in a rough rolling mill.

[Prior Art] A rough bar rolled by a rough rolling mill as an intermediate material when rolling a copper strip sometimes has camber (bending from left to right in the longitudinal direction of the rough bar). The occurrence of this cane bar not only impairs the dimensional accuracy of the final product and lowers the rolling yield, but also causes line troubles such as coarse bars clogging the side guides, requiring the rolling to be stopped.

In order to prevent the occurrence of camber in such coarse bars, countermeasures such as mechanical backlash correction and off-center correction for correcting the widthwise position of the fir roll have been conventionally used.

In addition, in order to prevent the occurrence of such camber,
Regardless of the cause of camber, it is also effective to quickly detect the meandering movement of the NU bar from side to side by some method, and adjust the leveling of the horizontal roll based on the detection results. Conventionally, when this method is carried out, it is common to detect the difference between the loads on the left and right sides of the horizontal roll, and level the horizontal roll based on this differential load.

[Problems to be Solved by the Invention] However, the conventional leveling of the horizontal roll based on the differential load between the left and right sides of the horizontal roll has the following problems. In other words, as shown in FIG. 3, if there is a difference between the cap or SD on the drive side 22 of the horizontal roll 21 and the gap on the free side 23 of 5F (SF > SD) and (Sp So), the original cover If the cross section of the rolled material 24 is rectangular, the rolled material 24 will bend to the free side, but since the rolled material 24 slides sideways to the free side,
The longitudinal center of the body 25 of the horizontal roll 21 and the material to be rolled 24
The width direction length ID of the rolled material 24 on the driving side from the body longitudinal center 25 of the horizontal roll 21 is shorter than the free side width direction length 1r. Therefore, the load Pr applied to the drive side 22 of the horizontal roll 2,
If the material to be rolled 24 does not slide laterally, the load PF will naturally be greater than the load PF applied to the free side 23 of the horizontal roll 21, but as a result of the material to be rolled 24 to shift laterally, P
If it's bigger than D or PP, it's hard to resist.

Therefore, even if an attempt is made to prevent the meandering of the rolled material by leveling based on the difference in load between the left and right sides of the horizontal rolls, there is a problem in that meandering cannot be prevented.

This invention solves the above-mentioned problems of the prior art,
An object of the present invention is to provide a method for preventing meandering of a rolled material in an O-rolling mill, which prevents meandering of a rolled material in a rough rolling mill.

[Means for Solving the Problems] The method for preventing meandering of rolled material in a rough rolling mill according to the present invention reduces the horizontal load in the width direction received by each roll of a pair of vertical rolls installed at the rear surface of the horizontal mill by 2. A calculator calculates the difference between the horizontal loads detected by each load detector, and a controller controls the roll gap on the left and right sides of the horizontal roll based on the calculated difference. This is a method for preventing meandering of rolled material in a rolling mill, and also reduces the horizontal load in the width direction that is received by each roll of a pair of vertical rolls installed on the front and rear surfaces of a horizontal mill by two rolls per pair of vertical rolls. A rolling mill that detects the horizontal load with a load detector, calculates the difference between the horizontal loads detected by each load detector with a calculator, and controls the roll gap on the left and right sides of the horizontal roll with a controller based on the calculated difference. This is a method for preventing meandering of rolled material.

[Function] In the method for preventing meandering of a rolled material in a rough rolling mill according to the present invention, a pair of shrinkage coils installed on the rear surface of a horizontal mill is used. 'The horizontal load in the width direction that the roll receives is detected by two load detectors, and the difference between the horizontal loads detected by each load detector is calculated by a calculator,
The left and right roll caps of the horizontal rolls are controlled by a controller based on the calculated difference, and the horizontal load in the width direction received by each roll of a pair of vertical rolls installed on the front and rear surfaces of the horizontal mill is controlled by a controller. Each vertical roll is detected by two load detectors, the difference between the horizontal loads detected by each load detector is calculated by a calculator, and the roll gap on the left and right sides of the horizontal roll is determined by a controller based on the calculated difference. Control. The present invention was constructed in this manner for the following reason. In other words, the conventional method of preventing the rolled material from meandering based on the load difference between the left and right sides of the horizontal rolls is due to the lateral sliding of the rolled material. However, the difference in horizontal and widthwise loads applied to the left and right vertical rolls is proportional to the degree of meandering of the rolled material. For example, if the rolled material tries to bend in the free direction with horizontal rolls, , on the rear surface of the horizontal roll, or on the vertical rolls on the front and rear surfaces, the material to be rolled is strongly pressed against the front vertical roll on the drive side, while the load on the front vertical roll on the free side is reduced. The material is strongly pressed against the rear vertical roll on the free side, while the load on the rear vertical roll on the drive side is reduced.Moreover, the force of this pressing increases as the degree of bending increases; The load is further reduced. Therefore, the horizontal and widthwise loads applied to the left and right rolls of the vertical roll are detected by each load detector, this difference is calculated by a calculator, and based on this calculation result, the horizontal roll By using a controller that controls the left and right gaps, it is possible to accurately correct the meandering of the rolled material.

[Example] A method for preventing meandering of a rolled material in a rough rolling mill according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIGS. 1 and 2 are explanatory diagrams showing the structure of a method for preventing meandering of a rolled material in a rough rolling mill according to an embodiment of the present invention.

In FIG. 1, this method for preventing meandering of a rolled material transfers the horizontal and widthwise loads acting on the drive side 1a and free side 1b of the vertical roll installed at the rear of the rolling mill to a load cell 2a.
, 2b, respectively, and the load cells 2a, 2b
The load signal detected by the horizontal load detector 3 is sent to the calculator 4, and the difference between the two load signals sent from the horizontal load detector 3 is calculated by the calculator 4. The leveling controller 5 controls the leveling of the horizontal roll 6 based on the difference.

A method for correcting the meandering of a rolled material using the rolled material meandering prevention device of the rough rolling mill according to one embodiment of the present invention is as follows. In other words, when the load difference ΔP is obtained by subtracting the free side load from the drive side load, the drive side reduction amount is ΔSD(
(closed when ΔP is positive, open when negative), then Δ5D=WXΔP×α...(
1) However, the meandering of the rolled material can be corrected by changing it as follows: W: Width of the rolled material, α nigain.

In FIG. 2, this method for preventing meandering of a rolled material is performed by applying a horizontal and width function to the driving side 1a and free side 1b of the rear vertical roll installed on the front and rear surfaces of the rolling mill, and the driving side IA and free side IB of the front vertical roll. The loads in the directions are detected by the load cells 2a, 2b and 2A, 2B, respectively, and the load signals detected by the load cells 2a, 2b, 2A, 2B are sent to the horizontal load detectors 3 and 31 by the calculator 4.
The calculation unit 4 calculates the difference between the two load signals sent from the horizontal load detectors 3 and 31. Based on the difference calculated by the calculation unit 4, the leveling controller 5 calculates the difference between the two load signals sent from the horizontal load detectors 3 and 31. Control leveling.

A method for correcting meandering of a rolled material using the meandering prevention device for a rolled material of a rough rolling mill according to an embodiment of the present invention is as follows. In other words, when the load difference obtained by subtracting the free side load from the drive side load is ΔP for the rear vertical roll and ΔP for the front vertical roll, the rolling reduction amount on the drive side is ΔSO
(Close when ΔP and ΔP1 are positive, open when negative) If we change Δ5D=WX(a・ΔP−b・ΔP,)X tx
−+2 However, W: Width of rolled material, α gain, a,
b is a positive constant and a+b=1 Note that the present invention is not limited to this embodiment, and Δ
Any functional relationship that changes ΔSO with P and ΔP1 as variables is within the scope of the present invention.

[Effects of the Invention] According to the present invention, it is possible to appropriately prevent meandering of a material to be rolled in a rough rolling mill.

[Brief explanation of the drawing]

FIGS. 1 and 2 are explanatory diagrams showing the structure of a method for preventing rolling material meandering in a rough rolling mill according to an embodiment of the present invention, and FIG. 3 shows lateral slipping of the rolled material due to meandering of the rolled material. It is an explanatory diagram. 2a, 2b, 2A, 2B-Load cell, 3.31...Horizontal load detector, 4...Calculator, 5...Leveling controller.

Claims (2)

[Claims] (1) Two load detectors detect the horizontal load in the width direction that each roll receives from a pair of vertical rolls installed at the rear of the horizontal mill, and the difference between the horizontal loads detected by each load detector A method for preventing meandering of rolled material in a rough rolling mill, characterized in that a calculator calculates the difference between the left and right rolls of a horizontal roll, and a controller controls the roll gap between the left and right horizontal rolls based on the calculated difference. (2) Two load detectors per each pair of vertical rolls detect the horizontal load in the width direction applied to each roll of a pair of vertical rolls installed on the front and rear surfaces of the horizontal mill. A method for preventing meandering of a rolled material in a rough rolling mill, characterized in that a difference between detected horizontal loads is calculated by a calculator, and a roll gap on the left and right sides of the horizontal rolls is controlled by a controller based on the calculated difference.