JPH0333409B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for monitoring the clearance between a roll chock and a cross head of a cross roll rolling mill, and is intended to prevent jamming of the roll chock by the cross head by monitoring slippage of the cross clutch. be.

In recent years, requirements for thickness accuracy in the width direction of rolled products have become increasingly strict. At present, in order to cancel the deflection of the roll due to the rolling load, the roll is provided with an initial crown. However, when the rolling conditions such as the width and thickness of the rolled material change significantly, it is necessary to keep rolls with various types of initial crowns and replace them with appropriate rolls. This leads to a decrease in the operating rate. Further, the crown of the roll is not constant and changes due to wear and thermal expansion of the roll as the rolling operation progresses.

Therefore, there has been a need for a means to control the thickness profile of a rolled material in the width direction without replacing the rolls. In response to this demand, we developed a rolling mill that can control the widthwise thickness of a wide range of rolled materials using the same roll and has a long roll life.
A four-high rolling mill was proposed as shown in No. 64908 and Japanese Patent Application Laid-open No. 153605/1983. In these rolling mills, the upper roll and the lower roll are arranged to intersect (cross) each at a required angle with respect to a line perpendicular to the rolling direction in a plan view including the rolling direction. By moving the upper and lower rolls and adjusting the cross angle, cross point, etc., the same roll can be used to control the thickness in the plate thickness direction even if rolling conditions change, and the roll life is long. Become.

In such a cross-roll rolling mill, the mechanism for crossing the upper and lower rolls includes the following (1) to (4) in addition to the function of moving the upper and lower rolls for crossing.
It is necessary to have the following functions.

(1) A function that accurately holds the upper and lower rolls at predetermined cross point positions.

(2) A function to support the horizontal force that is generated in the direction of rolling material movement, positive or negative, against the upper and lower rolls during rolling.

(3) The upper and lower rolls must be able to move vertically under the conditions of (1) and (2) above both when setting the rolling reduction amount and during operation. Therefore, the function is to obtain appropriate clearance between the roll chock and the crosshead for moving the roll chock.

(4) A function that prevents galling due to contact between the roll chocks and crossheads during roll reassembly and facilitates the reassembly work.

The present applicant has proposed Japanese Patent Application No. 56-74901 (Japanese Unexamined Patent Publication No. 57-190712) and Japanese Patent Application No. 56-79165 (Japanese Unexamined Patent Publication No. 56-79165) as a roll cross mechanism that addresses each of the above-mentioned functions (1) to (4). Kaisho
57-195521).

Since the present invention provides a method for monitoring cross clutch slippage in order to prevent jamming of the roll chock by the cross head of the roll cross mechanism, prior to explaining the present invention, an example of the roll cross mechanism is shown in FIG. This will be explained with reference to FIG. FIG. 1 is a schematic front view including a partial cross section showing an example of a roll cross mechanism, and FIG. 2 is an explanatory diagram of the operation of a cross drive device for an upper work roll chock.

In Fig. 1, 1 is a housing, 2 and 2' are upper and lower work rolls, 3 and 3' are upper and lower back-up rolls, 4a, 4b, 5a, 5b,
6a, 6b, 7a and 7b are worm jacks fixed to the housing as moving mechanisms, 8a and 9a are roll jocks for the upper roll, and 8a' and 9
a' is each roll chock for the lower roll, 10a, 1
1a, 12a and 13a are crossheads. A worm jack, a roll chock and a crosshead are mounted on both shaft ends of each roll 2, 2', 3, 3', ie, on the working side "A" and on the driving side "B" (see FIG. 2). However, since FIG. 1 is a front view seen from the working side, various mechanisms on the drive side are not visible.
Therefore, each mechanism on the driving side is illustrated with a symbol with a corresponding mechanism on the working side attached. By adopting a roll cross mechanism as shown in Fig. 1, each worm jack 4a, 4b...7a, 7b, 4
c, 4d...7c, 7d and move the roll jocks 8a, 8b...9a', 9b' back and forth in the rolling direction Z via the crossheads 10a, 11a...13b to separate the upper roll pairs 2, 3 and the lower roll pair. Pairs 2' and 3' can be crossed. In addition,
14 is a rolled material.

FIG. 2 is a diagram illustrating the operation of the roll cross mechanism, with the work roll 2 representing the upper roll pair of the rolling mill shown in FIG. The lower roll pair has the same structure as that shown in FIG. 2, except that the worm jack is configured to horizontally rotate in the opposite direction to that of the rolls shown in FIG. 2, so illustration and description thereof will be omitted.

In FIG. 2, the clutch 16 is operated by a cross drive motor 15a as a rotational drive device of the moving mechanism.
a, 17a, bevel gears 18a, 19a, and mechanical tie shafts 20a, 21a.
a, 4b, 5a, 5b, crosshead 1
By moving 0a and 11a, the roll chock 8a on the work side "A" is horizontally moved in the front and back sides in the rolling direction Z. Similarly, the roll chock 8b on the driving side "B" is driven by the motor 15b, and the clutches 16b, 17b, bevel gears 18b, 19
b, mechanical tie shafts 20b, 32b, worm jacks 4c, 4d, 5c, 5d, and crosshead 10
b, 11b to the front and back sides of the rolling direction Z, horizontally moving in the opposite direction to the roll chock 8a on the working side "A".

In this case, the rotation direction and speed of the motors 15a, 15b are measured by speed sensors 27a, 27b, and the rotation amount of the mechanical tie shaft is measured by a rotation angle detector (pulse transmitter).
22a, 22b, 23a, and 23b, and based on these measurement values, the opposite crosshead pair [1
0a, 11a] and [10b, 11b] in the same direction, synchronously in opposite directions, or cross clutches 16a, 16b, 1.
A control mechanism (not shown) is provided for controlling each crosshead to move independently by appropriately opening and closing 7a and 17b. Further, position detection devices 24 and 25 mounted on the housing 1 detect the horizontal positions of the roll jocks 8a and 8b in the rolling direction with respect to the housing 1, and feed back the detection signals to the control mechanism. In addition, 26a, 26b, 26 in FIG.
c and 26d are reduction gears.

Therefore, if the initial adjustment is made using the cross clutch to maintain a predetermined clearance between the roll chock and the crosshead, _then as _shown in Fig. It is possible to accurately set and maintain a predetermined cross angle α. In addition, when changing the rolls, in order to prevent "galling" caused by contact between the roll chock and the crosshead and to make the changeover work easier, the cross clutch on the crosshead side that should be activated is turned ON after the cross angle has been returned to zero. By setting the clutch on the opposite side to "OFF", the clearance between the roll chock and the crosshead can be widened.

A cross clutch is provided to fulfill the above-mentioned functions, but this clutch should be selected to be reliable and have sufficient transmission torque.

However, since this cross clutch is a slipping clutch, 100% reliability cannot necessarily be expected, so it is necessary to constantly monitor clutch slippage in some way to ensure absolute accuracy. In particular, when setting the cross angle, it is necessary to maintain a certain clearance between the roll chock and the opposing cross head, and if the cross clutch slips when setting the cross angle, the opposing cross head will tighten the roll chock. Excessive torque may occur in the drive system, which may lead to sticking or seizure of the threaded portion of the worm jack.

Based on the above-mentioned consideration, the present invention has a roll configured so that the angle formed by the roll axis in a horizontal plane including the rolling direction can be slightly tilted from a right angle by displacing the roll chock of the rolling mill. A pair of roll chock moving crossheads disposed oppositely on both sides of the roll chock are each provided with a rotationally driven moving mechanism including a cross clutch, and the pair of crossheads move synchronously in the same direction and move synchronously in opposite directions. Alternatively, a control mechanism for controlling the rotational drive direction and rotational drive amount of the moving mechanism is provided in each of the various movement modes that are independently moved, and the rolls are crossed depending on the selection of the movement mode and held at an arbitrary position. Another object of the present invention is to provide a clutch slippage monitoring system that can prevent the roll chock from being jacked by the crossheads in a crossroll rolling mill configured to move each crosshead independently.

The main structure of the first invention to achieve this object is to detect the difference in the amount of rotation between the non-connected side shafts of a plurality of mutually connected cross clutches, and if the detected amount exceeds a predetermined range, the moving mechanism It is characterized by stopping the drive. In this way, it is not possible to determine which cross clutch has slipped, but the calculation formula required for determining whether or not a clutch has slipped is small and simple.

On the other hand, the main structure of the second invention that achieves the above object is to constantly detect the rotation amount difference between the input and output shafts of each cross clutch, and stop driving the moving groove when the detected amount exceeds a predetermined range. It is characterized by causing In this case, more calculation expressions are required to determine whether or not the clutch has slipped, but there is an advantage in determining which cross clutch has slipped.

In both the first and second inventions, clutch slippage is constantly monitored, and if any of the crossclutches slips, the drive of the moving mechanism is stopped, so that the jacking caused by the pair of crossheads facing the roll chock is prevented. It can be prevented.

An embodiment in which the present invention is applied to the cross roll rolling mill shown in FIGS. 1 and 2 will be described below. In FIG. 2, 28 is a cross clutch slip inspection device, and counters 29a and 29 for each speed sensor 27a and 27b of the motors 15a and 15b
29b and crossheads 10a, 10b, 11
Rotation angle detectors 22a, 22b, 23 of a, 11b
Counters 30a, 30b, 3 for a, 23b
1a, 31b, and the output values of each counter C ₁ , C ₂ ,
Based on C ₃ , C ₄ , C ₅ , and C ₆ , the following formula (1) or the following formula (2)
a calculation device 32 that calculates whether the value of is below the allowable value;
a, 15b, and a control device 33 for controlling the components a and 15b.

| Count value C ₃ - Count value C ₅ | | Count value C ₄ - Count value C ₆ | ...Formula (1) | Count value C ₃ - Count value C ₁ | | Count value C ₅ - Count value C ₁ | | Count value C ₄ - Count value C ₂ | | Count value C ₆ - Count value C ₂ | ...(2) However, C ₁ : Count value for speed sensor 27a C ₂ : Count value C ₃ for speed sensor 27b: Count value C ₄ for rotation angle detector 22a: Count value C ₅ for rotation angle detector 22b: Count value C ₆ for rotation angle detector 23a: Count value for rotation angle detector 23b. Furthermore, each count value takes into consideration the reduction ratio as necessary.

As for the operation, when using equation (1), 16a and 17
The cross clutch a is connected via the motor 15a, and the cross clutches 16b and 17b are connected via the motor 15b, so the rotation angle detectors that detect the position of the crosshead on both sides of the roll chock are , 22a and 23a, and 22b and 23b, ie, whether both crossheads facing the roll chock are moving the same amount. That is, |C ₃ −C ₅ |≒0 |C ₄ −C ₆ |≒0 ...Equation (1') It is determined by calculation whether or not. If either of the above equations (1') is not satisfied, an emergency stop process for the cross drive motors 15a, 15b is taken by a signal from the control device 33. However, among the four cross clutches,
It is unclear which one is slipping.

In the case of formula (2), each cross motor 15a, 1
A rotation angle detector 22a detects the crosshead position on both sides of the roll chock based on the speed of the roll chock 5b.
By comparing each of 23a and 23a with the speed sensor 27a, and each of 22b and 23b with the speed sensor 27b, the rotation amount difference between the input and output shafts of each cross clutch is independently detected and clutch slippage is monitored. In other words, calculate whether |C ₃ −C ₁ |≒0 |C ₅ −C ₁ |≒0 |C ₄ −C ₂ |≒0 |C ₆ −C ₂ |≒0 ...Equation (2′) judge. In this case as well, the above formula (2′)
If either of these conditions is not satisfied, an emergency stop procedure for the cross drive motors 15a, 15b is taken in response to a signal from the control device 33.

Although the above embodiment concerns the upper roll pair shown in FIG. 2, which is represented by the work roll 2, the lower roll pair is also completely the same except that the rotating direction of the rolls is reversed.

As described above, according to the present invention, jamming caused by the pair of crossheads facing the roll chock can be prevented.

[Brief explanation of drawings]

FIG. 1 is a schematic front view of a cross roll rolling mill, and FIG. 2 is an explanatory diagram of the operation of a cross drive device for an upper work roll chock to which the present invention is applied. In the drawing, 4b, 4d, 5b, 5d are worm jacks,
8a, 8b are roll chokes, 10a, 10b,
11a, 11b are crossheads, 15a, 15b
are cross drive motors, 16a, 16b, 17a,
17b is a cross clutch, 22a, 22b, 23
a, 23b are rotation angle detectors, 27a, 27b are speed sensors, 28 is a cross clutch slip inspection device,
29a, 29b, 30a, 30b, 31a, 31
b is a counter, 32 is an arithmetic device, and 33 is a control device.

Claims (1)

[Scope of Claims] 1. A roll having a configuration in which the angle formed by the roll axis in a horizontal plane including the rolling direction can be slightly tilted from a right angle by displacing the roll chock of the rolling mill, A pair of roll chock moving crossheads arranged oppositely on both sides are each provided with a rotationally driven moving mechanism including a cross clutch, and the pair of crossheads move in synchrony in the same direction, move in synchrony in opposite directions, or move in synchrony in opposite directions. A control mechanism for controlling the rotational drive direction and rotational drive amount of the moving mechanism is attached to each of the various movement modes that are independently moved, and depending on the selection of the movement mode, the rolls can be crossed, held at any position, or each In a cross roll rolling mill configured to move cross heads independently, the rotation amount difference between the non-connected shafts of multiple cross clutches that are connected to each other is constantly detected, and if the detected amount exceeds a predetermined range, A method for monitoring cross clutch slippage, comprising stopping the driving of the moving mechanism. 2. A roll having a configuration in which the angle formed by the roll axis in a horizontal plane including the rolling direction can be slightly tilted from a right angle by displacing the roll chock of the rolling mill, and a pair of rolls disposed oppositely on both sides of the roll chock. Each crosshead for moving the roll chock is provided with a rotary movement drive including a cross clutch, and the pair of crossheads are moved in synchronization in the same direction, in synchronization in opposite directions, or independently. A control mechanism for controlling the rotational drive direction and rotational drive amount of the moving mechanism is attached to each of the various movement modes, and depending on the selection of the movement mode, the rolls can be crossed and held at any position or each crosshead can be independently operated. In a cross-roll rolling mill configured to move, the rotation amount difference between the input and output shafts of each cross clutch is constantly detected, and if the detected amount exceeds a predetermined range, the drive of the moving mechanism is stopped. How to monitor cross clutch slippage.