WO2019187508A1

WO2019187508A1 - Rolling mill and method for controlling rolling mill

Info

Publication number: WO2019187508A1
Application number: PCT/JP2019/001024
Authority: WO
Inventors: 力造中谷; 恭彦丸山; 友弘工藤
Original assignee: スチールプランテック株式会社
Priority date: 2018-03-27
Filing date: 2019-01-16
Publication date: 2019-10-03
Also published as: CN111902223A; JP2019171394A; US20210001388A1; KR102364870B1; TW201941840A; KR20200121877A; CN111902223B; JP6832309B2; TWI701089B

Abstract

A rolling mill equipped with a pair of rolls that includes a first roll and a second roll for rolling a steel bar to be rolled, and a first hydraulic rolling reduction device and second hydraulic rolling reduction device, which are connected respectively to a first support part and second support part rotatably supporting the first roll at the ends of the first roll, and which move the first roll relative to the second roll, said rolling mill characterized in that a rolling portion, which is a portion where the steel bar is rolled and that is set in a continuous partial region of the pair of rolls in the lengthwise direction, is set at a position at which the distance from the first support part to the rolling portion and the distance from the second support part to the rolling portion are different, and in that the rolling mill is equipped with a distance sensor configured so as to measure a roll deflection amount for the rolling portion of the first roll and/or the second roll, and a control unit configured so as to control the rolling reduction amount of the first hydraulic rolling reduction device and the rolling reduction amount of the second hydraulic rolling reduction device on the basis of a detection value from the distance sensor.

Description

Rolling mill and rolling mill control method

The present invention relates to a rolling mill and a control method for the rolling mill.

A roll pair including a first roll and a second roll for rolling the strip to be rolled, and a first support part and a second support part that rotatably support the first roll at both ends of the first roll, respectively. A rolling mill comprising a first hydraulic reduction device and a second hydraulic reduction device that moves the first roll relative to the second roll is already well known.

And the rolling part which is a part which rolls the strip set to the one part continuous area | region in the longitudinal direction of the roll pair of the said rolling mill is rolled from the distance from a 1st support part to a rolling part, and a 2nd support part. Using a rolling mill set at a position where the distance to the portion is different from each other (the rolling mill that performs rolling at the rolling portion set in this manner is referred to as a “non-central rolling mill” for convenience). When rolled, there are problems such as poor shape accuracy of the cross section of the bar steel and bending in the longitudinal direction of the bar steel.

Therefore, in the conventional non-center rolling mill, the position of the rolling part is detected before rolling, and the vertical position of both ends of the roll is individually set based on the position information, thereby improving the cross-sectional shape accuracy of the bar steel. The control for making it performed was performed (for example, refer patent document 1).

Japanese Utility Model Publication No. 6-46567

However, the shape control method used in the conventional non-center rolling mill has a problem that the cross-sectional shape accuracy of the rolled strip is low.

The present invention has been made in view of such a problem, and an object of the present invention is to realize highly accurate shape control in rolling of bar steel using a non-center rolling mill.

The main invention for achieving the above object is:
A roll pair including a first roll and a second roll for rolling the strip to be rolled, and a first support part and a second support part that rotatably support the first roll at both ends of the first roll, respectively. A rolling mill comprising a first hydraulic reduction device and a second hydraulic reduction device that are connected and move the first roll relative to the second roll, and a part of the roll pair in the longitudinal direction The rolling part, which is a part for rolling the bar steel, set in a continuous region of, the distance from the first support part to the rolling part and the distance from the second support part to the rolling part are different from each other A distance sensor configured to measure a roll deflection amount in the rolled portion of at least one of the first roll and the second roll, and the distance sensor A rolling mill, characterized in that it comprises a control unit configured to control the amount of reduction reduction amount and the second hydraulic pressure system of the first hydraulic pressure device based on the detected value of the service.

Other features of the present invention will be clarified by the description of the present specification and the accompanying drawings.

According to the present invention, it is possible to realize highly accurate shape control in rolling of bar steel using a non-center rolling mill.

1 is a schematic front view of a rolling mill 10 according to the present embodiment. It is the figure which showed the relationship between the control part 40 of the rolling mill 10, and another apparatus. The upper diagram of FIG. 3 is a diagram showing a state where rolling is performed with the strip 1 sandwiched in a state where the roll pair is deflected, and the lower diagram of FIG. 3 explains the roll deflection amount of the first roll 14a. It is explanatory drawing for. It is the front schematic of the rolling mill 10 which concerns on 2nd Embodiment. It is the front schematic of the rolling mill 10 which concerns on 3rd Embodiment.

At least the following matters will become clear from the description of this specification and the accompanying drawings.

A roll pair including a first roll and a second roll for rolling the strip to be rolled, and a first support part and a second support part that rotatably support the first roll at both ends of the first roll, respectively. A rolling mill comprising a first hydraulic reduction device and a second hydraulic reduction device that are connected and move the first roll relative to the second roll, and a part of the roll pair in the longitudinal direction The rolling part, which is a part for rolling the bar steel, set in a continuous region of, the distance from the first support part to the rolling part and the distance from the second support part to the rolling part are different from each other A distance sensor configured to measure a roll deflection amount in the rolled portion of at least one of the first roll and the second roll, and the distance Rolling mill, characterized in that on the basis of the detected value of the Nsa and a control unit configured to control the amount of reduction reduction amount and the second hydraulic pressure system of the first hydraulic pressure device.

According to such a rolling mill, it is possible to realize highly accurate shape control in rolling the strip using a non-center rolling mill.

In this rolling mill, a plurality of the rolling portions may be set at different positions in the longitudinal direction of the roll pair.

According to such a rolling mill, it is possible to realize highly accurate shape control even if the strip is rolled using any rolling part.

In this rolling mill, at least one of the distance sensors may be provided for each of the plurality of rolling portions set at different positions.

According to such a rolling mill, a mechanism for moving the distance sensor can be omitted, and thus the configuration related to the distance sensor can be simplified.

Such a rolling mill may include a movable support device that supports the distance sensor so as to be movable along the longitudinal direction.

According to such a rolling mill, it is possible to reduce the distance sensor compared to the case where a distance sensor is provided for each of a plurality of rolling portions.

In this rolling mill, the movable support device includes an attachment portion to which the distance sensor is attached, a rail portion with which the attachment portion is slidably engaged, and the attachment portion is moved along the rail portion. And a driving device to be operated.

According to such a rolling mill, reliable movable support can be realized with a simple structure.

Such a rolling mill may be configured to measure the amount of roll deflection at both end portions in the longitudinal direction of the rolled portion.

According to such a rolling mill, the thickness of both ends in the longitudinal direction of the bar can be grasped from the amount of roll deflection at both ends in the longitudinal direction of the rolled portion, and the thickness of both ends in the longitudinal direction of the bar is made closer to equal. It becomes possible.

In this rolling mill, the control unit is configured to control a reduction amount of the first hydraulic reduction device and a reduction amount of the second hydraulic reduction device in real time during the rolling of the strip. Also good.

According to such a rolling mill, it is possible to realize shape control with higher accuracy in rolling steel bars using a non-center rolling mill.

In this rolling mill, a caliber may be provided in each of the first roll and the second roll in the rolling portion.

According to such a rolling mill, in rolling using a roll pair provided with a caliber, since rolling is generally performed as a non-center rolling mill (because it is frequently performed), the present invention is It works more effectively.

A roll pair including a first roll and a second roll for rolling the strip to be rolled, and a first support part and a second support part that rotatably support the first roll at both ends of the first roll, respectively. A rolling mill control method comprising: a first hydraulic reduction device and a second hydraulic reduction device that are connected and move the first roll relative to the second roll, the longitudinal direction of the roll pair A rolling part which is a part for rolling the bar steel, which is set in a part of the continuous region, a distance from the first support part to the rolling part and a distance from the second support part to the rolling part Are set at different positions, measuring a roll deflection amount in the rolling portion of at least one of the first roll and the second roll, and based on the roll deflection amount. Control method of a rolling mill, characterized in that it comprises a controlling and reduction ratio of reduction rate between the second hydraulic pressure system of the first hydraulic pressure device have, a.

制御 According to such a rolling mill control method, the same effects as those of the rolling mill described above can be obtained.

=== About the rolling mill 10 according to the present embodiment ===
The rolling mill 10 according to the present embodiment is an apparatus that rolls the strip 1 to be rolled, and is used as a non-center rolling mill. The non-center rolling mill is a rolling mill 10 that is characterized by the position of the strip 1 when rolling, and details thereof will be described later. Examples of the strip 1 include a flat steel, a shaped steel, a bar, a wire, a rail, and the like, and refers to a steel having a shape that is significantly longer than the cross-sectional area. In the present embodiment, the steel bar 1 is rolled using a flat bar.

FIG. 1 is a schematic front view of a rolling mill 10 according to the present embodiment. In the drawings according to the present embodiment, the horizontal direction (horizontal direction) of the paper surface is referred to as the “longitudinal direction”, and the left side (right side) of the paper surface is referred to as “WS side (DS side)” or “left (right)”. The vertical direction (vertical direction) is referred to as “vertical direction”, and the upper side (lower side) of the drawing is referred to as “upper (lower)”. FIG. 2 is a diagram showing the relationship between the control unit 40 of the rolling mill 10 and other devices.

FIG. 1 shows a housing 11 of a rolling mill 10. Inside the housing 11 (inside the housing 11), a roll pair (first roll 14 a and second roll 14 b) provided in the rolling mill 10 and a support unit are provided. (Support portions for the first support portion 13a, the second support portion 13b, and the second roll 14b), a hydraulic pressure reduction device (the first hydraulic pressure reduction device 12a and the second hydraulic pressure reduction device 12b), and a load cell (the first load cell 15a and the first pressure reduction device 12b). 2 load cell 15b), distance sensor 20, movable support device 30, and balance cylinder mechanism 50 are arranged.

The roll pair is a pair of upper and lower flat rolls composed of a first roll 14a and a second roll 14b. And the 1st roll 14a and the 2nd roll 14b have the same shape, and have a rolling part with a large shaft diameter, and a shaft part with a small shaft diameter provided at both ends in the longitudinal direction of the rolling part. is doing. As shown in FIG. 1, the roll pair includes the drive unit 32 shown in FIG. 2 while sandwiching the steel bar 1 with a gap between the first roll 14 a provided on the upper side and the second roll 14 b provided on the lower side. Rotation is performed by driving rotation. That is, the rolling mill 10 includes a roll pair including a first roll 14a and a second roll 14b for rolling the strip 1 to be rolled.

Moreover, in this Embodiment, some continuous area | regions (equivalent to the rolling part AP) are set in the longitudinal direction of the rolling part of a roll pair as the position of the longitudinal direction of the roll pair which the strip 1 passes. And is stored in the storage unit 41 to be described later. That is, in the rolling mill 10, a plurality of rolling portions AP are set at different positions in the longitudinal direction of the roll pair.

The support part supports both ends of each roll of the roll pair so that the roll pair can rotate. Therefore, the roll pair can be rotated by the drive rotation of the drive unit 32. Here, the “both ends of the roll” supported by the support portion is a position that is symmetrical with respect to the roll center line RC (center line in the longitudinal direction of the roll pair) and is a shaft portion (that is, , Not the rolling part). As for the 1st roll 14a, the shaft part by the side of WS is supported by the 1st support part 13a, and the shaft part by the side of DS is supported by the 2nd support part 13b. And these support parts are connected to the hydraulic pressure reduction apparatus via the balance beam 51 mentioned later. The second roll 14b is supported by a support portion of the second roll 14b in which both ends of the roll are fixed to the lower surface of the housing 11 (the lower surface inside the housing 11).

The hydraulic pressure reduction devices (the first hydraulic pressure reduction device 12a and the second hydraulic pressure reduction device 12b) are fixed to the upper side surface of the housing 11 (the upper side surface inside the housing 11) via a load cell, which will be described later, and the first roll 14a is fixed. This is a device that moves relative to the second roll 14b. That is, the first hydraulic pressure reducing device 12a is connected to the first support portion 13a, the second hydraulic pressure reducing device 12b is connected to the second support portion 13b, and by moving the support portion to which each is connected, The first roll 14a is moved relative to the second roll 14b. That is, the rolling mill 10 is connected to the first support portion 13a and the second support portion 13b that rotatably support the first roll 14a at both ends of the first roll 14a, and the first roll 14a is connected to the second roll 14b. A first hydraulic pressure reducing device 12a and a second hydraulic pressure reducing device 12b that are relatively moved are provided.

The load cells (the first load cell 15a and the second load cell 15b) are sensors for detecting the pressure applied to the support portion connected to each of the hydraulic pressure reduction devices, and are provided between the housing 11 and the hydraulic pressure reduction device. It has been. That is, the first load cell 15a is provided between the upper side surface (installation surface) of the first hydraulic pressure reduction device 12a and the upper side surface of the housing 11, and the upper side surface (installation surface) of the second hydraulic pressure reduction device 12b and the housing 11 are provided. A second load cell 15b is provided between the upper side surfaces. The load cell applies a pressure (reaction force of the pressure applied to the support portion connected to the hydraulic pressure reduction device) between the hydraulic pressure reduction device and the housing 11 to the support portion connected to the hydraulic pressure reduction device. The detected pressure value is continuously detected, and the detection result is immediately transmitted to the control unit 40.

The control unit 40 has an automatic roll GAP control (Automatic Gap Control (AGC)) function, and the first support unit 13a is caused by extension deformation (vertical deflection) in the vertical direction of the housing 11 based on the pressure detected by the load cell. And the vertical displacement of the second support portion 13b can be corrected.

The control unit 40 that has received the pressure value detected by the load cell is the amount of bending of the housing 11 in the vertical direction and the vertical direction of a bearing (not shown) of the support (a member for rotatably supporting the first roll 14a). Is calculated using the detected pressure value, and the reduction amounts of the first hydraulic reduction device 12a and the second hydraulic reduction device 12b are sequentially corrected using these calculated deflection amounts. The amount of bending of the bearing is calculated based on the load-radial displacement graph of the bearing and the detected pressure value.

The distance sensor 20 is a sensor for measuring the amount of roll deflection, and is a sensor that detects the distance from the distance sensor 20 to the roll. Here, the “roll deflection amount” means the position in the vertical direction of the roll measured by the detection value of the distance sensor 20 in a state where the roll pair is not bent (hereinafter also referred to as a zero deflection state), and the roll pair is bent. It is a difference with the position in the up-down direction of the roll measured by the detection value of the distance sensor 20 in the state where

In the present embodiment, the distance sensor 20 is fixed to a mounting portion 30a of the movable support device 30 described later provided on the upper side of the first roll 14a. A total of two distance sensors 20 are provided, one above each of one end and the other end (both ends of the rolled portion AP) in the longitudinal direction of the rolled portion AP of the strip 1 to be rolled. Therefore, the distance sensor 20 detects the distance to the first roll 14a at both ends of the rolled portion AP and transmits it to the control unit 40. As the distance sensor 20, for example, an eddy current displacement sensor or a laser distance meter can be used.

The movable support device 30 is provided from one end of the both ends of the first roll 14a to the other end on the lower surface of a later-described balance beam 51 on the upper side of the first roll 14a, and the distance sensor 20 is attached to the movable support device 30. A mounting portion 30a, a rail portion 30b in which the mounting portion 30a is slidably engaged, and a driving device (not shown) that moves the mounting portion 30a along the rail portion 30b. That is, it is a device that moves the distance sensor 20 from one end to the other end of both ends of the roll above the first roll 14a. Here, “both end portions of the roll” are both end portions of the rolled portion of the roll (that is, not the shaft portion). One attachment portion 30a and a driving device are arranged for one distance sensor 20, and a plurality of attachment portions 30a can be slidably engaged with one rail portion 30b. That is, a plurality of attachment portions 30a (distance sensor 20) engaged with the rail portion 30b are moved by the driving device along the rail portion 30b from one end portion to the other end portion of the rolling portion of the first roll 14a. . That is, the rolling mill 10 includes a movable support device 30 that supports the distance sensor 20 so as to be movable along the longitudinal direction.

Further, the movable support device 30 is provided with a position detection function for detecting the position of the attachment portion 30 a in the longitudinal direction, and the detected position information is transmitted to the control unit 40. Therefore, the attachment part 30a holding the distance sensor 20 is moved to the rail part 30b by a command from the control part 40 to a commanded longitudinal position from one end part to the other end part of the rolling part using the drive device as a power source. It is possible to move along.

The control unit 40 shown in FIG. 2 is provided in the rolling mill 10 and receives information transmitted from various apparatuses as described above. And the control part 40 has the memory | storage part 41 which memorize | stores this information, and the calculating part 42 which calculates using this information, the information memorize | stored in the memory | storage part 41, and the calculation result of the calculating part 42 Commands are issued to various devices based on the above. That is, the control unit 40 controls various devices provided in the rolling mill 10 based on various information.

The balance cylinder mechanism 50 includes a first balance cylinder 50a, a second balance cylinder 50b, and a balance beam 51. The first balance cylinder 50a and the second balance cylinder 50b are fixed to the upper side surface of the housing 11 so as to be symmetric with respect to the roll center line RC. 51 is connected. The balance beam 51 is provided from the first support portion 13a to the second support portion 13b in the longitudinal direction, and the first roll is formed by pulling the first support portion 13a and the second support portion 13b upward during non-rolling. The space | interval between 14a and the 2nd roll 14b is maintained. When the support portion to which the first hydraulic pressure reducing device 12a and the second hydraulic pressure reducing device 12b are connected is moved, the balance beam 51 is also moved along with the movement. Moreover, it connects to the 1st balance cylinder 50a and the 2nd balance cylinder 50b, and this connection can rotate by making the direction along the direction which penetrates the paper surface of FIG. 1 into a rotating shaft.

Here, as described above, in the rolling mill 10, a plurality of rolling portions AP are set at different positions in the longitudinal direction of the roll pair, and the setting of the rolling portion AP according to the present embodiment is illustrated in FIG. 1 as an example. As shown in FIG. 4, the center in the longitudinal direction of the rolled portion AP is set so as not to coincide with the roll center line RC. That is, the rolling portion AP is set so that the positions of both end portions of the rolling portion AP are asymmetrical with respect to the roll center line RC. That is, since the 1st support part 13a and the 2nd support part 13b are provided left-right symmetrically with respect to the roll centerline RC, the strip 1 set to the one part continuous area | region in the longitudinal direction of a roll pair is used. In the rolled part AP which is a part to be rolled, the distance from the first support part 13a to the rolled part AP and the distance from the second support part 13b to the rolled part AP are set at different positions.

Below, the control method of the non-center rolling mill shown in FIG. 1 (that is, the rolling mill 10 of FIG. 1 showing a state in which the strip 1 is rolled in one rolling portion AP of a plurality of set rolling portions AP). Will be described.

=== Control of Rolling Mill 10 ===
Control of the rolling mill 10 according to the present embodiment will be described with reference to the upper diagrams of FIGS. 1 and 3 and the lower diagram of FIG.

The upper diagram of FIG. 3 is a diagram showing a state where rolling is performed with the strip 1 sandwiched in a state where the roll pair is deflected, and the lower diagram of FIG. 3 explains the roll deflection amount of the first roll 14a. It is explanatory drawing for. Here, the roll pair during rolling is not greatly bent as shown in the upper and lower diagrams of FIG. 3, but is exaggerated and greatly bent for the sake of convenience in order to make the explanation easy to understand. .

As shown in the upper diagram of FIG. 3, the roll pair during rolling according to the present embodiment is such that the first roll 14 a has the center (position of the roll center line RC) on the upper side and both ends on the lower side. The second roll 14b is bent at the center and the both ends are bent upward. Therefore, when the bar 1 is rolled using the rolling mill 10 as a non-center rolling mill as shown in FIG. 1, the bar 1 having a cross-sectional shape along the bent shape of the roll pair is generated. A difference occurs in the thickness at both ends in the direction.

In the present embodiment, in order to improve the cross-sectional shape accuracy of the bar 1, both end portions in the longitudinal direction are set so that the thickness of the bar 1 rolled by the non-center rolling mill shown in FIG. Control is performed so that the thicknesses of the two are uniform. Below, the procedure of this control is demonstrated in order.

First, it selects as rolling part AP which uses the rolling part AP shown in FIG. Then, the control unit 40 of the rolling mill 10 places (moves) one distance sensor 20 at a position corresponding to the position of one end and the other end of both ends in the longitudinal direction of the selected rolling portion AP. . That is, the rolling mill 10 is configured to measure the amount of roll deflection at both ends in the longitudinal direction of the rolled portion AP.

The selection of the rolled portion AP to be used may be performed manually, for example, the rolled portion of the strip 1 upstream of the roll pair in the conveying direction of the strip 1 (direction passing through the paper surface in FIG. 1). A sensor for detecting the AP may be provided, and the detection may be performed based on the detection result of the sensor.

And if the distance sensor 20 moves to the position corresponding to the position of the both ends of the rolling part AP, before performing rolling, the control part 40 will be in the "state where the roll pair is not bent (deflection zero state)". The value of the distance sensor 20 is detected and stored in the storage unit 41.

Then, the control unit 40 starts rolling the strip 1 in the rolling mill 10. During rolling, the two distance sensors 20 located above the first detection part P1 and the second detection part P2 shown in the upper and lower views of FIG. 3 (located above the both ends of the rolling part AP). Detects the distance to the first roll 14 a and transmits the detected value to the control unit 40.

The control unit 40 that has received the detection values of the first detection unit P1 and the second detection unit P2 detects the first roll deflection amount X1, the second detection from the detection value of the first detection unit P1, as shown in the lower diagram of FIG. The second roll deflection amount X2 is measured (calculated) from the detected value of the part P2. Here, the broken straight line extending in the longitudinal direction shown in the lower diagram of FIG. 3 is a straight line representing the position of the first roll 14a in the zero deflection state (hereinafter also referred to as a reference line BL). That is, the first roll deflection amount X1 and the second roll deflection amount X2 are the difference between the detection value of the distance sensor 20 received by the control unit 40 during rolling and the detection value of the distance sensor 20 in the zero deflection state. .

And the control part 40 which measured the 1st roll deflection amount X1 and the 2nd roll deflection amount X2 is the 1st hydraulic reduction device 12a and 2nd so that the thickness of the both ends of the longitudinal direction of the strip 1 may become equal. The reduction amount (correction amount) of the hydraulic reduction device 12b is calculated.

Specifically, first, in the calculation unit 42, the longitudinal inclination (the inclination between both ends) with respect to the reference line BL of the first detection unit P1 and the second detection unit P2 from the first roll deflection amount X1 and the second roll deflection amount X2. (Corresponding to S1) is calculated using the following equation.

Inclination S1 between both ends = (first roll deflection amount X1−second roll deflection amount X2) / (second distance L2−first distance L1)
Here, as shown in the lower diagram of FIG. 3, the first distance L1 is a distance in the longitudinal direction from the roll center line RC to the first detection unit P1, and the second distance L2 is the first distance from the roll center line RC. 2 is the distance in the longitudinal direction to the detection unit P2. Further, the support portion distance L (used in an arithmetic expression described later) is a distance in the longitudinal direction from the roll center line RC to the first support portion 13a. These values are stored in advance in the storage unit 41 because they are determined by the position in the longitudinal direction of the rolling part to be used, the configuration of the rolling mill 10, and the like.

The calculation unit 42 that has calculated the slope S1 between both ends calculates the vertical correction amounts of the first support unit 13a and the second support unit 13b using the following calculation formula.

Correction amount of the first hydraulic pressure reducing device 12a (first support portion 13a) = ((first roll deflection amount X1 + second roll deflection amount X2) / 2) − (inclination S1 between both ends × support portion distance L)
Correction amount of the second hydraulic pressure reducing device 12b (second support portion 13b) = ((first roll deflection amount X1 + second roll deflection amount X2) / 2) + (inclination S1 between both ends × support portion distance L)
The portion of “(first roll deflection amount X1 + second roll deflection amount X2) / 2” in these arithmetic expressions is an average value of the first roll deflection amount X1 and the second roll deflection amount X2 (hereinafter, both the average roll deflection amount and the average roll deflection amount). The portion “(inclination S1 between both ends × support portion distance L)” is a correction amount of the support portion for making the inclination of the inclination S1 between both ends along the reference line BL.

If it does so, the control part 40 will move the support part connected to each hydraulic pressure reduction apparatus to an up-down direction based on the calculated correction amount. That is, the first support portion 13a and the second support portion 13b are moved in the vertical direction so that the amount of reduction of the average roll deflection amount is increased and the inclination S1 between both ends is along the reference line BL.

Specifically, the correction amount of the first hydraulic pressure reducing device 12a includes an increment (positive value) of a reduction amount corresponding to an average roll deflection amount to compensate for a shortage of the reduction amount due to the deflection of the roll, and a slope S1 between both ends. This is the sum of the increment (negative value) of the amount of reduction for causing the inclination to follow the reference line BL. When this takes a positive value, the amount of reduction of the first hydraulic reduction device 12a is increased. Therefore, the first support portion 13a is moved downward by an amount corresponding to the correction amount. Conversely, when taking a negative value, the reduction amount of the first hydraulic reduction device 12a is decreased. The one support portion 13a is moved upward by the correction amount.

Further, the correction amount of the second hydraulic pressure reducing device 12b is based on the increment (positive value) of the average roll deflection amount to compensate for the shortage of the roll reduction amount due to the roll deflection, and the slope of the slope S1 between both ends. This is the sum of the increase (positive value) of the reduction amount to be along the line BL and increases the reduction amount of the second hydraulic reduction device 12b, so that the second support portion 13b is moved downward. The movement is increased by the correction amount.

In this way, the amount of reduction of the first hydraulic reduction device 12a and the second hydraulic reduction device 12b with respect to the first roll 14a is controlled.

Here, as shown in the upper diagram of FIG. 3, since the second roll 14b is bent in the same manner as the first roll 14a, correction (control) of the hydraulic pressure reducing device is also required for the second roll 14b. . Therefore, in the present embodiment, it is assumed that the second roll 14b is bent in the same manner as the first roll 14a. That is, it shall be bent similarly symmetrically with respect to the center line of the strip 1 in the thickness direction (vertical direction).

However, since the second roll 14b is not provided with a device for moving in the vertical direction, the second roll 14b cannot move. Therefore, in the present embodiment, the amount of bending of the first roll 14a by the first roll 14a and the amount of bending of the second roll 14b (that is, twice the amount of bending of the first roll 14a). It will move in the vertical direction. If it does in this way, control of the amount of reduction of the 1st hydraulic reduction device 12a and the 2nd hydraulic reduction device 12b can be performed to the 1st roll 14a and the 2nd roll 14b.

As described above, the first roll 14a moves in the vertical direction, thereby moving the average roll deflection amount of the first roll 14a and the second roll 14b, and reducing the inclination of the rolled portion (both of each other The inclination of the inclination between both ends can be along the reference line BL). That is, based on the detection value of the distance sensor 20, the control unit 40 compensates for the shortage of the reduction amount caused by the bending of the roll to reduce the dimensional error of the bar 1 and the rolling portion set in the first roll 14a. The first hydraulic pressure reducing device 12a improves the cross-sectional shape accuracy by reducing the inclination between both ends in the longitudinal direction of the AP and the inclination between both ends in the longitudinal direction of the rolled portion AP set in the second roll 14b. And a reduction amount of the second hydraulic reduction device 12b are controlled.

Moreover, the control part 40 which concerns on this Embodiment will perform the calculation of a correction amount immediately in the calculating part 42, if the distance information of the 1st detection part P1 and the 2nd detection part P2 is received from the distance sensor 20, If correction is necessary, the amount of reduction of the hydraulic pressure reduction device is controlled with respect to the first hydraulic pressure reduction device 12a and the second hydraulic pressure reduction device 12b, and the next transmission from the distance sensor 20 is awaited. The distance sensor 20 continuously detects the distance between the first detection unit P1 and the second detection unit P2, and immediately transmits the detection result to the control unit 40. That is, the control unit 40 controls the reduction amount of the first hydraulic reduction device 12a and the reduction amount of the second hydraulic reduction device 12b in real time while the strip 1 is being rolled.

=== Effectiveness of the rolling mill 10 according to the present embodiment ===
As described above, the rolling mill 10 according to the present embodiment includes a roll pair including the first roll 14a and the second roll 14b for rolling the strip 1 to be rolled, and the first roll at both ends of the first roll 14a. A first hydraulic pressure reducing device 12a and a second hydraulic pressure device that are respectively connected to a first support portion 13a and a second support portion 13b that rotatably support 14a and move the first roll 14a relative to the second roll 14b. The rolling part 10 is a rolling mill 10 including a rolling device 12b, and a rolling part AP, which is a part for rolling the strip 1 and is set in a part of a continuous region in the longitudinal direction of the roll pair, is from the first support part 13a. The distance from the rolling portion AP and the distance from the second support portion 13b to the rolling portion AP are set at different positions, and the roll deflection at the rolling portion AP of the first roll 14a is set. A distance sensor 20 configured to measure the amount, and a control configured to control a reduction amount of the first hydraulic reduction device 12a and a reduction amount of the second hydraulic reduction device 12b based on a detection value of the distance sensor 20. Part 40. Therefore, it is possible to realize highly accurate shape control in rolling the strip 1 using a non-center rolling mill.

When the strip 1 is rolled using a non-center rolling mill, a roll amount is insufficient due to the bending of the roll and an inclination in the rolled portion AP of the roll is generated, causing a dimensional error in the strip 1 and the longitudinal direction of the rolled strip 1. Therefore, there is a problem in that the shape accuracy of the cross section of the bar 1 or bending in the longitudinal direction of the bar 1 occurs.

On the other hand, in the rolling mill 10 according to the present embodiment, the distance sensor 20 configured to measure the amount of roll deflection in the rolling portion AP of the first roll 14a and the detection value of the distance sensor 20 are used. And a control unit 40 configured to control the reduction amount of the first hydraulic reduction device 12a and the reduction amount of the second hydraulic reduction device 12b. That is, by detecting the deformation of the first roll 14a using the distance sensor 20, the deformation of the roll pair that occurs during rolling can be directly grasped, and the roll deflection amount of the rolled portion AP is measured from the deformation. It becomes possible to do. In the rolling of the bar 1 using the non-center rolling mill, the control unit 40 controls the reduction amount of the first hydraulic reduction device 12a and the reduction amount of the second hydraulic reduction device 12b according to the roll deflection amount. It becomes possible to realize highly accurate shape control.

Moreover, in this Embodiment, it was supposed that it was comprised so that the roll deflection amount of the both ends in the longitudinal direction of the rolling part AP could be measured. Therefore, by correcting the reduction amount of the hydraulic reduction device based on the roll deflection amount at both ends in the longitudinal direction of the rolled portion AP, the dimensional error of the bar 1 is reduced by compensating for the shortage of the reduction amount caused by the roll deflection. In addition, the inclination between both ends in the longitudinal direction of the rolling portion AP set on the first roll 14a and the inclination between both ends in the longitudinal direction of the rolling portion AP set on the second roll 14b can be reduced, High-precision shape control can be realized.

In the present embodiment, the control unit 40 controls the reduction amount of the first hydraulic reduction device 12a and the reduction amount of the second hydraulic reduction device 12b in real time while the strip 1 is being rolled. . That is, when the control unit 40 controls the reduction amount of the hydraulic reduction device in real time, when it becomes necessary to control the reduction amount of the hydraulic reduction device, the control can be performed quickly. That is, it is possible to realize shape control with higher accuracy in rolling the strip 1 using a non-center rolling mill.

In the present embodiment, a plurality of rolled portions AP are set at different positions in the longitudinal direction of the roll pair. That is, the present invention can be applied to all the rolling parts AP of the rolling parts AP that are set at different positions in the longitudinal direction of the roll pair. That is, it is possible to realize highly accurate shape control even when the strip 1 is rolled using any rolling portion AP.

Further, in the present embodiment, the movable support device 30 that supports the distance sensor 20 so as to be movable along the longitudinal direction is provided. That is, when the rolling part AP is changed to another rolling part AP, the distance sensor 20 can be moved to the changed rolling part AP by the movable support device 30, and the changed rolling is performed by the moved distance sensor 20. The value of the partial AP can be detected. Therefore, the distance sensor 20 can be reduced as compared with the case where the distance sensor 20 is provided for each of the plurality of rolling portions AP.

In the present embodiment, the movable support device 30 includes an attachment portion 30a to which the distance sensor 20 is attached, a rail portion 30b in which the attachment portion 30a is slidably engaged, and the attachment portion 30a to the rail portion 30b. And a driving device that is moved along. That is, the reliable movable support device 30 can be realized with a simple structure of the attachment portion 30a, the rail portion 30b, and the drive device.

=== Other Embodiments ===
As mentioned above, although the rolling mill 10 which concerns on this invention was demonstrated based on the said embodiment, embodiment mentioned above is for making an understanding of this invention easy, and this invention is the said embodiment. It is not limited to. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes the equivalents thereof.

In the above embodiment, the roll pair is a flat roll, but the present invention is not limited to this. For example, a caliber (having the same groove shape as that of the steel strip 1 rolled in the groove provided in the roll pair is formed, and the cross-sectional shape of the steel bar 1 is formed by passing the groove. Rolling in the above embodiment A roll pair provided with (corresponding to the partial AP) may be used. That is, the caliber may be provided in each of the 1st roll 14a and the 2nd roll 14b in the rolling part AP.

In rolling using a roll pair provided with a caliber, since rolling is generally performed as a non-central rolling mill (because it is frequently performed), the present invention works more effectively.

In the above embodiment, the balance cylinder mechanism 50 is provided on the upper side of the first roll 14a and the movable support device 30 is provided on the lower surface of the balance beam 51. However, the present invention is not limited to this. For example, as shown in FIG. 4, the installation position of the movable support device 30 may be changed and a first support portion balance cylinder 60 a and a second support portion balance cylinder 60 b may be provided instead of the balance cylinder mechanism 50.

FIG. 4 is a schematic front view of the rolling mill 10 according to the second embodiment. As shown in FIG. 4, the difference from the first embodiment is that the movable support device 30 is provided on the upper side surface of the housing 11, and the first support portion 13 a is used instead of the balance cylinder mechanism 50. The first support portion balance cylinder 60a is provided, and the second support portion balance cylinder 60b is provided in the second support portion 13b.

Further, as a modification of the second embodiment, for example, as shown in FIG. 5, there is an example in which the installation position of the movable support device 30 is changed from the housing 11 to the fixed beam 70. FIG. 5 is a schematic front view of the rolling mill 10 according to the third embodiment.

As shown in FIG. 5, the difference from the second embodiment is that a fixed beam 70 is provided independently of the housing 11, and the movable support device 30 is provided not on the housing 11 but on the lower surface of the fixed beam 70. This is the point.

In the first embodiment, the difference in the rolling load between the first support portion 13a side and the second support portion 13b side (measured value measured by the first load cell 15a and the second load cell 15b) is caused. Since the inclination of the first roll 14a caused by the difference (the difference in height position between the first support portion 13a and the second support portion 13b) is corrected by the AGC function, the balance beam 51 provided with the distance sensor 20 ( The rail portion 30b) is always kept horizontal, and the control unit 40 can accurately measure only the roll deflection amount based on the detection value of the distance sensor 20.

However, in the second embodiment and the third embodiment, the rail portion 30b cannot be kept horizontal by the AGC function, and the control unit 40 accurately determines the roll deflection amount based on the detection value of the distance sensor 20. Cannot be measured. Therefore, the control unit 40 according to the second embodiment and the third embodiment corrects the amount of displacement caused by the vertical deflection of the housing 11 with respect to the detection value of the distance sensor 20, and based on the corrected value. Thus, the amount of reduction of the hydraulic reduction device 12a and the hydraulic reduction device 12b is controlled.

In the above embodiment, the distance sensor 20 is provided only on the upper side of the first roll 14a. However, the present invention is not limited to this. For example, it may be provided only on the lower side of the second roll 14b, or may be provided on both the upper side of the first roll 14a and the lower side of the second roll 14b. However, it is preferable to provide on the upper side of the 1st roll 14a so that the cooling water used at the time of rolling may not be applied.

When the distance sensor 20 is provided only on the lower side of the second roll 14b, the control unit 40 may perform the calculation described in the above embodiment for the rolling portion AP of the second roll 14b. Further, when the distance sensor 20 is provided on both the upper side of the first roll 14a and the lower side of the second roll 14b, the control unit 40 performs the calculation described in the above embodiment on the rolling portion AP of the first roll 14a. And each of the rolling portions AP of the second roll 14b, and based on the respective calculation results (one of the rolls is bent in the same manner symmetrically with respect to the vertical center line of the bar 1) It is only necessary to calculate and control the amount of reduction of the first hydraulic reduction device 12a and the second hydraulic reduction device 12b.

That is, the rolling mill 10 only needs to include the distance sensor 20 configured to measure the roll deflection amount in the rolling portion AP of at least one of the first roll 14a and the second roll 14b.

In the above embodiment, the distance sensor 20 is moved in the longitudinal direction by providing the movable support device 30, but the present invention is not limited to this. For example, the distance sensor 20 may be provided for all of the plurality of set rolling parts AP so that the movement cannot be performed. That is, at least one distance sensor 20 may be provided for each of the plurality of rolling portions AP set at different positions. In this way, since the mechanism for moving the distance sensor 20 can be omitted, the configuration related to the distance sensor 20 can be simplified.

Moreover, in the said embodiment, although control of the rolling mill 10 using the two distance sensors 20 was demonstrated, it is not restricted to this. For example, the rolling mill 10 may be controlled using three or more distance sensors 20.

1 steel strip 10 rolling mill 11 housing 12a first hydraulic reduction device 12b second hydraulic reduction device 13a first support portion 13b second support portion 14a first roll 14b second roll 15a first load cell 15b second load cell 20 distance sensor 30 movable Support device 30a Mounting portion 30b Rail portion 32 Drive portion 40 Control portion 41 Storage portion 42 Calculation portion 50 Balance cylinder mechanism 50a First balance cylinder 50b Second balance cylinder 51 Balance beam 60a First support portion balance cylinder 60b Second support portion balance Cylinder 70 Fixed beam AP Rolled portion P1 First detector P2 Second detector S1 Inclination X1 between both ends X1 First roll deflection amount X2 Second roll deflection amount RC Roll center line BL Reference line L1 First distance L2 Second distance L Support distance

Claims

A roll pair including a first roll and a second roll for rolling the strip to be rolled;
A first support that is connected to a first support and a second support that rotatably support the first roll at both ends of the first roll, and that moves the first roll relative to the second roll. A rolling mill comprising a hydraulic reduction device and a second hydraulic reduction device,
The rolling part, which is a part for rolling the bar steel, is set in a part of the continuous region in the longitudinal direction of the roll pair, and the distance from the first support part to the rolling part and the second support part The distance to the rolling part is set at a different position,
A distance sensor configured to measure a roll deflection amount in the rolled portion of at least one of the first roll and the second roll; and
A rolling machine comprising: a control unit configured to control a reduction amount of the first hydraulic reduction device and a reduction amount of the second hydraulic reduction device based on a detection value of the distance sensor.
The rolling mill according to claim 1,
A rolling mill characterized in that a plurality of the rolling portions are set at different positions in the longitudinal direction of the roll pair.
A rolling mill according to claim 2,
A rolling mill characterized in that at least one distance sensor is provided for each of the plurality of rolling portions set at different positions.
The rolling mill according to claim 1 or 2,
A rolling mill comprising: a movable support device that supports the distance sensor so as to be movable along the longitudinal direction.
A rolling mill according to claim 4, wherein
The movable support device includes an attachment portion to which the distance sensor is attached, a rail portion with which the attachment portion is slidably engaged, and a drive device that moves the attachment portion along the rail portion. A rolling mill characterized by having
A rolling mill according to any one of claims 1 to 5,
A rolling mill characterized in that the roll deflection amount at both end portions in the longitudinal direction of the rolled portion can be measured.
The rolling mill according to any one of claims 1 to 6,
The control unit is configured to control a reduction amount of the first hydraulic reduction device and a reduction amount of the second hydraulic reduction device in real time during the rolling of the bar steel. .
A rolling mill according to any one of claims 1 to 7,
In the rolling part, a caliber is provided on each of the first roll and the second roll.
A roll pair including a first roll and a second roll for rolling the strip to be rolled;
A first support that is connected to a first support and a second support that rotatably support the first roll at both ends of the first roll, and that moves the first roll relative to the second roll. A rolling mill control method comprising a hydraulic reduction device and a second hydraulic reduction device,
The rolling part, which is a part for rolling the steel bar, set in a part of the continuous region in the longitudinal direction of the roll pair, the distance from the first support part to the rolling part and the second support part Setting the distance to the rolled part different from each other;
Measuring the amount of roll deflection in the rolled portion of at least one of the first roll and the second roll;
A control method for a rolling mill, comprising: controlling a reduction amount of the first hydraulic reduction device and a reduction amount of the second hydraulic reduction device based on the roll deflection amount.