TWI701089B - Rolling mill and its control method - Google Patents

Abstract

The rolling mill is equipped with a pair of rollers, a first hydraulic pressing device, and a second hydraulic pressing device. The pair of rollers includes a first roller and a second roller for rolling a steel bar as a rolling target. The first hydraulic pressure reduction device and the second hydraulic pressure reduction device are respectively connected to the first support portion and the second support portion and are used to move the first roller relative to the second roller, and the first The support portion and the second support portion rotatably support the first roller at both ends of the first roller, and are characterized in that: The rolling portion is set at a position where the distance from the first support portion to the rolling portion and the distance from the second support portion to the rolling portion are different from each other, and the rolling portion is provided on the roller pair A continuous area in the longitudinal direction and used to roll the steel bar. The rolling mill is equipped with a distance sensor and a control unit. The distance sensor is configured to measure the The amount of roll deflection in the rolling portion of at least one of the first roll and the second roll, and the control unit is configured to control the first hydraulic pressing device based on the detection value of the distance sensor The amount of reduction and the amount of reduction of the aforementioned second hydraulic pressure reduction device.

Description

Rolling mill and its control method

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

A well-known rolling mill is equipped with a pair of rollers, a first hydraulic pressure reduction device, and a second hydraulic pressure reduction device. The roller pair system includes a first roller and a second roller for rolling a steel bar as a rolling target. The rollers, the first hydraulic pressing device and the second hydraulic pressing device are respectively connected to the first support portion and the second support portion for moving the first roller relative to the second roller, the first support portion and The second support portion rotatably supports the first roller at both ends of the first roller.

In addition, if a rolling mill is used that sets the rolling portion at a position where the distance from the first support portion to the rolling portion and the distance from the second support portion to the rolling portion are different from each other (in the rolling portion set in this way, The aforementioned rolling mill for rolling is referred to as "non-center rolling mill" for convenience). Rolling steel bars may cause problems such as poor cross-sectional shape accuracy of the steel bars and bending in the longitudinal direction of the bars. The rolling part is a continuous area set in a part in the longitudinal direction of the roller pair of the aforementioned rolling mill, and is a part for rolling the steel bar.

Therefore, in the conventional non-center rolling mill, the position of the rolling part is detected before the rolling, and the positions of the two ends of the roll are individually set up and down based on the position information, thereby improving the accuracy of the cross-sectional shape of the bar. Improved control (for example, refer to Patent Document 1). [Prior Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Kokai Publication No. 6-46567

[The problem to be solved by the invention]

However, the shape control method adopted by the conventional off-center rolling mill has the problem of low accuracy of the cross-sectional shape of the rolled steel bar.

The present invention was developed in view of this problem, and its purpose is to realize high-precision shape control in the rolling of bar steel using a non-center rolling mill. [Technical means to solve the problem]

In order to achieve the above-mentioned object, the rolling mill of the main invention is provided with a pair of rollers, a first hydraulic pressing device, and a second hydraulic pressing device. The first roller and the second roller, the first hydraulic pressing device and the second hydraulic pressing device are respectively connected to the first support portion and the second support portion and are used to make the first roller relative to the The second roller moves, and the first support portion and the second support portion are rotatably supported by the first roller at both ends of the first roller, and it is characterized in that: The rolling portion is set at a position where the distance from the first support portion to the rolling portion and the distance from the second support portion to the rolling portion are different from each other, and the rolling portion is provided on the roller pair A continuous area in the longitudinal direction and used to roll the steel bar. The rolling mill is equipped with a distance sensor and a control unit. The distance sensor is configured to measure the The amount of roll deflection in the rolling portion of at least one of the first roll and the second roll, and the control unit is configured to control the first hydraulic pressing device based on the detection value of the distance sensor The amount of reduction and the amount of reduction of the aforementioned second hydraulic pressure reduction device.

The other features of the present invention can be understood from the description of this specification and the accompanying drawings. [Effects of Invention]

According to the present invention, high-precision shape control can be realized in the rolling of bar steel using a non-center rolling mill.

According to the description of this specification and the attached drawings, at least the following matters can be understood.

A rolling mill is provided with a roller pair, a first hydraulic pressure reduction device, and a second hydraulic pressure reduction device. The roller pair includes a first roller and a second roller for rolling a steel bar as a rolling target. The rollers, the first hydraulic pressing device and the second hydraulic pressing device are respectively connected to the first support portion and the second support portion and are used to move the first roller relative to the second roller, The first support portion and the second support portion are configured to rotatably support the first roller at both ends of the first roller, and are characterized in that the rolling portion is set to allow the rolling from the first support portion to the roller The distance between the part and the distance from the second support part to the rolling part are different from each other. The rolling part is a continuous area provided in a part of the longitudinal direction of the roller pair, and is used to connect the strip The part where the steel is rolled. The rolling mill is equipped with a distance sensor and a control unit. The distance sensor is configured to measure the rolling of at least one of the first roller and the second roller Part of the roll deflection amount, the control unit is configured to control the reduction amount of the first hydraulic pressing device and the reduction amount of the second hydraulic pressing device based on the detection value of the distance sensor .

According to such a rolling mill, high-precision shape control can be realized in the rolling of the bar steel using a non-center rolling mill.

The rolling mill may be configured such that the rolling parts are set in plural at different positions in the longitudinal direction of the roller pair.

According to such a rolling mill, high-precision shape control can be achieved regardless of which rolling section is used to roll the steel bar.

The rolling mill may be configured to include at least one distance sensor in each of the plurality of rolling parts installed at different positions.

According to such a rolling mill, the mechanism for moving the distance sensor can be omitted, so the structure of the distance sensor can be simplified.

The rolling mill may be equipped with a movable support device that supports the distance sensor so as to be movable in the longitudinal direction.

According to such a rolling mill, the number of distance sensors can be reduced compared to the case where distance sensors are provided in each of the plurality of rolling parts.

The rolling mill may also be configured such that the movable support device is provided with: a mounting portion to which the distance sensor is mounted, a rail portion to which the mounting portion is slidably engaged, and the mounting portion to move along the rail portion The driving device.

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

The rolling mill may be configured to be capable of measuring the amount of deflection of the roller at both ends in the longitudinal direction of the rolling portion.

According to such a rolling mill, the thickness of the both ends of the steel bar in the longitudinal direction can be grasped according to the amount of roll deflection at the both ends in the longitudinal direction of the rolled part, and the thickness of the both ends of the steel bar in the longitudinal direction Approaching equality.

The rolling mill may also be configured such that the control unit, during the execution of the rolling of the steel bar, is to instantly adjust the reduction amount of the first hydraulic reduction device and the reduction amount of the second hydraulic reduction device. (real time) control.

According to such a rolling mill, it is possible to realize more precise shape control in the rolling of the bar steel using a non-center rolling mill.

The rolling mill may be configured such that the first roller and the second roller are respectively provided with calibers in the rolling portion.

According to such a rolling mill, in rolling using a pair of rolls provided with a groove, because it is configured as a non-center rolling mill to perform rolling (frequently performed), the present invention can be more effective.

A method for controlling a rolling mill, the rolling mill is provided with a pair of rollers, a first hydraulic pressing device, and a second hydraulic pressing device. The roller pair includes a method for rolling a steel bar as a rolling object. The first roller and the second roller, the first hydraulic pressing device and the second hydraulic pressing device are connected to the first support portion and the second support portion, respectively, and are used to allow the first roller to be relative to the second support. 2 The roller moves, and the first support portion and the second support portion rotatably support the first roller at both ends of the first roller, characterized in that it includes the following steps: The rolling portion is set at a position where the distance from the first support portion to the rolling portion and the distance from the second support portion to the rolling portion are different from each other, and the rolling portion is provided on the roller pair A continuous area in the longitudinal direction that is used to roll the steel bar. The amount of roll deflection in the rolled portion of at least one of the first roll and the second roll is measured, The reduction amount of the first hydraulic pressing device and the reduction amount of the second hydraulic pressing device are controlled based on the amount of deflection of the roller.

According to the control method of such a rolling mill, the same effect as the case of the aforementioned rolling mill can be exerted.

===About the rolling mill 10 of this embodiment === The rolling mill 10 of this embodiment is an apparatus for rolling the steel bar 1 as a rolling target, and is used as a non-center rolling mill. The non-center rolling mill is a rolling mill 10 that has characteristics in the position of the steel bar 1 when rolling, as described in detail later. Examples of the steel bar 1 include flat steel, section steel, bar steel, wire rod, rails, etc., and refer to steel materials of a shape whose length is significantly larger than the size of the cross-sectional area. In the present embodiment, flat steel is used as the steel bar 1 for rolling.

Fig. 1 is a schematic front view of a rolling mill 10 of the present embodiment. In the drawings of this embodiment, the horizontal direction (horizontal direction) of the paper is the "length direction", and the left side (right side) of the paper is called "WS side (DS side)" or "left (right)", The vertical direction (vertical direction) of the paper is referred to as the "up and down direction", and the upper side (lower side) of the paper is referred to as "up (down)". In addition, FIG. 2 shows the relationship between the control unit 40 of the rolling mill 10 and other devices.

1 shows the housing 11 of the rolling mill 10. Inside the housing 11 (inside the housing 11), a pair of rollers (the first roller 14a and the second roller 14b) and a support part of the rolling mill 10 are arranged (The first support portion 13a, the second support portion 13b, and the support portion of the second roller 14b), hydraulic pressure reduction device (first hydraulic pressure reduction device 12a and second hydraulic pressure reduction device 12b), load cell ( The first load cell 15a and the second load cell 15b), the distance sensor 20, the movable support device 30, and the balance cylinder mechanism 50).

The pair of rollers is a pair of flat rolls (flat rolls) formed by the first roller 14a and the second roller 14b. In addition, the first roller 14a and the second roller 14b are formed in the same shape and have a rolling portion with a large shaft diameter, and shaft portions with a small shaft diameter provided on both ends of the rolling portion in the longitudinal direction. As shown in Figure 1, the pair of rollers sandwich the bar steel 1 between the first roller 14a provided on the upper side and the second roller 14b provided on the lower side, and are driven by the drive unit 32 shown in Figure 2 By rotating and rotating, rolling is performed. That is, the rolling mill 10 is provided with a roller pair including a first roller 14a and a second roller 14b for rolling the steel bar 1 as a rolling target.

In addition, in the present embodiment, as the position in the longitudinal direction of the roller pair through which the steel bar 1 passes, a continuous area (corresponding to the rolling portion AP) of a portion in the longitudinal direction of the rolling portion of the roller pair is set as A plurality of them are stored in the storage unit 41 described later. That is, in the rolling mill 10, a plurality of rolling parts AP are set at different positions in the longitudinal direction of the roller pair.

The support part supports both ends of each roller of the roller pair in a state where the roller pair is rotatable. Therefore, the roller pair can be rotated by the driving rotation of the driving unit 32. Here, the "both ends of the roller" supported by the supporting part are symmetrical positions with respect to the roller center line RC (the center line of the longitudinal direction of the roller pair), and belong to the shaft part (that is, not the rolling part). ). In the first roller 14a, the shaft on the WS side is supported by the first supporting portion 13a, and the shaft on the DS side is supported by the second supporting portion 13b. Furthermore, these support parts are connected to the hydraulic pressure reduction device through the balance beam 51 mentioned later. In addition, the second roller 14b has both ends of the roller supported by the support portion of the second roller 14b fixed to the lower side surface of the casing 11 (the lower side surface inside the casing 11).

The hydraulic pressure reduction device (the first hydraulic pressure reduction device 12a and the second hydraulic pressure reduction device 12b) is fixed to the upper side of the housing 11 (upper side inside the housing 11) through a load element described later. And it is a device which moves the 1st roller 14a with respect to the 2nd roller 14b. In other words, the first hydraulic pressure reduction device 12a is connected to the first support portion 13a, and the second hydraulic pressure reduction device 12b is connected to the second support portion 13b. By moving the respective connected support portions, the first The first roller 14a moves relative to the second roller 14b. That is, the rolling mill 10 is provided with a first hydraulic pressing device 12a and a second hydraulic pressing device 12b, and the first hydraulic pressing device 12a and the second hydraulic pressing device 12b are connected to the first supporting part respectively. 13a and the second support portion 13b are connected to allow the first roller 14a to move relative to the second roller 14b. The first support portion 13a and the second support portion 13b are attached to both ends of the first roller 14a so that the first roller 14a is rotatable地Support.

The load cell (the first load cell 15a and the second load cell 15b) is a sensor for detecting the pressure applied to the supporting part to which the hydraulic pressure reduction device is connected, and is provided by the housing 11 and the oil Hold down the device. That is, the first load cell 15a is installed between the upper side (installation surface) of the first hydraulic pressing device 12a and the upper side of the housing 11, and the upper side (installation surface) of the second hydraulic pressing device 12b ) And the upper surface of the housing 11 is provided with a second load element 15b. Moreover, the load cell continuously detects the pressure pinched by the hydraulic pressure reduction device and the housing 11 (reaction force to the pressure applied to the support part connected to the hydraulic pressure reduction device), and serves as the hydraulic pressure reduction device The pressure value given by the connected support part, and the detection result is immediately sent to the control part 40.

The control unit 40 has an automatic roller GAP control (Automatic Gap Control (AGC)) function. According to the pressure detected by the load cell, it can correct the expansion and contraction deformation (longitudinal deflection) of the casing 11 in the vertical direction. The amount of displacement in the vertical direction of the first support portion 13a and the second support portion 13b.

The control unit 40, which receives the pressure value detected by the load cell, uses the detected pressure value to calculate the amount of deflection in the upper and lower directions of the housing 11 and the bearing (not shown) of the support portion The amount of deflection in the upper and lower directions of the member that rotatably supports the first roller 14a, and the calculated deflection amount, are used to perform the first hydraulic pressing device 12a and the second hydraulic pressing device 12b The amount of reduction is revised successively. The deflection of the bearing is calculated based on the load-radial displacement curve of the bearing and the detected pressure value.

The distance sensor 20 is a sensor used to measure the amount of deflection of the roller, and is a sensor used to detect the distance from the distance sensor 20 to the roller. Here, the "roller deflection amount" refers to the upper and lower direction of the roller measured by the detection value of the distance sensor 20 in the unbent state of the roller pair (hereinafter also referred to as the zero deflection state) The difference between the position and the position of the roller in the up and down direction measured by the detection value of the distance sensor 20 when the roller pair is bent.

In addition, in this embodiment, the distance sensor 20 is fixed to the attachment part 30a of the movable support device 30 mentioned later provided on the upper side of the 1st roller 14a. In addition, one distance sensor 20 is respectively provided on one end portion and the other end (both ends of the rolling portion AP) in the longitudinal direction of the rolled steel bar 1 to be rolled. A total of two distance sensors 20 are installed. Therefore, the distance sensor 20 detects the distance to the first roller 14a at both ends of the rolling portion AP and sends it to the control unit 40. As the distance sensor 20, for example, an eddy current displacement sensor, a laser rangefinder, etc. can be used.

The movable support device 30 is provided with a mounting portion 30a, a rail portion 30b, and a driving device not shown. The mounting portion 30a is located on the upper side of the first roller 14a and is provided on the lower side of the balance beam 51 described later. One end of the two ends of 14a spans to the other end, and the distance sensor 20 is installed; the rail 30b is for the mounting part 30a to be slidably engaged; the driving device not shown in the figure is for the installation The portion 30a moves along the rail portion 30b. That is, it is a device that is attached to the upper side of the first roller 14a and moves the distance sensor 20 from one end to the other end of the two ends of the roller. Here, "the two ends of the roll" refers to the two ends of the rolling portion of the roll (that is, not the shaft portion). Furthermore, one mounting portion 30a and a driving device are arranged for one distance sensor 20, and a plurality of mounting portions 30a can be slidably engaged with one rail portion 30b. In other words, from one end to the other end of the rolling portion of the first roller 14a, the plurality of mounting portions 30a (distance sensors 20) engaged with the rail portion 30b are moved along the rail portion 30b by the drive device . That is, the rolling mill 10 is equipped with the movable support device 30 which supports the distance sensor 20 movably in a longitudinal direction.

In addition, the movable support device 30 has a position detection function for detecting the position of the mounting portion 30 a in the longitudinal direction, and sends the detected position information to the control portion 40. Therefore, the mounting part 30a holding the distance sensor 20 can be moved from one end to the other end of the rolling part along the rail part 30b according to the instruction of the control part 40, using the driving device as the power source The position in the length direction of the instruction.

The control unit 40 shown in FIG. 2 is installed in the rolling mill 10, and receives information sent from various devices as described above. In addition, the control unit 40 has a storage unit 41 that stores the information, and a calculation unit 42 that performs calculations using the information and the information stored in the storage unit 41, and performs calculations based on the calculation results of the calculation unit 42. Various devices issue instructions. In other words, 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 50 a, a second balance cylinder 50 b, and a balance beam 51. The first balance cylinder 50a and the second balance cylinder 50b are fixed to the upper side of the housing 11 in a symmetrical position with respect to the roller centerline RC, and the respective cylinder portions that can move up and down are connected to the balance beam 51 connection. The balance beam 51 is installed across from the first support portion 13a to the second support portion 13b in the longitudinal direction. When not rolled, the first support portion 13a and the second support portion 13b are pulled upward to The space between the first roller 14a and the second roller 14b is maintained. If the first hydraulic pressure reduction device 12a and the second hydraulic pressure reduction device 12b move the respective connected support portions, the balance beam 51 also moves in accordance with the movement. In addition, the balance beam 51 is connected to the first balance cylinder 50a and the second balance cylinder 50b, and this connection is capable of rotating about a direction along the paper surface of FIG. 1 as a rotation axis.

Here, as described above, in the rolling mill 10, the rolling part AP is set at different positions in the longitudinal direction of the roller pair. The setting of the rolling part AP in this embodiment is shown as an example. As shown in 1, it is set so that the center in the longitudinal direction of the rolled portion AP does not coincide with the roll center line RC. That is, the rolling part AP is set so that the position of the both ends of the rolling part AP may become a left-right asymmetrical position with respect to the roll centerline RC. In other words, because the first support portion 13a and the second support portion 13b are provided symmetrically with respect to the roll center line RC, the rolling portion AP is provided such that the distance from the first support portion 13a to the rolling portion AP and from the first 2 The distances from the supporting portion 13b to the rolling portion AP are different from each other. The rolling portion AP is a continuous area set at a portion in the longitudinal direction of the roller pair, and is a portion for rolling the steel bar 1.

Hereinafter, the non-center rolling mill shown in FIG. 1 (that is, the rolling mill 10 in FIG. 1 showing the state in which one of the plurality of set rolling sections AP rolls one steel bar is displayed) ) The control method.

===About the control of the rolling mill 10=== The control of the rolling mill 10 of the present embodiment will be described with reference to the upper diagrams of FIGS. 1 and 3 and the lower diagram of FIG. 3.

The top view of FIG. 3 shows the state where the steel bar 1 is pinched and rolled while the roller pair is deflected; the bottom view of FIG. 3 is an explanatory view for explaining the amount of roll deflection of the first roll 14a . Here, the pair of rollers in general rolling does not flex significantly as shown in the top and bottom diagrams of Figure 3. To make the description easy to understand, it is exaggerated and flexed significantly for convenience. .

In the roller pair in the rolling of this embodiment, as shown in the upper diagram of FIG. 3, the first roller 14a is bent so that the center (position of the roller center line RC) is on the upper side and both ends are on the lower side. The second roller 14b is bent so that the center part is on the lower side and both ends are on the upper side. Therefore, if the rolling mill 10 as a non-center rolling mill as shown in FIG. 1 is used to roll the steel bar 1, the cross-sectional shape of the steel bar 1 will be produced following the bending shape of the roller pair. The thickness of both ends of the steel bar 1 in the longitudinal direction will be different.

In this embodiment, in order to improve the accuracy of the cross-sectional shape of the steel bar 1, the thickness of the steel bar 1 rolled by the non-center rolling mill shown in FIG. The thickness is controlled in a uniform manner. The following is the order of the control sequence.

First, among a plurality of rolling parts AP set in the rolling mill 10, the rolling part AP shown in FIG. 1 is selected as the used rolling part AP. In this way, the control unit 40 of the rolling mill 10 arranges one distance sensor 20 at positions corresponding to the positions of one end and the other end of the two ends in the longitudinal direction of the selected rolling section AP. Let it move). In other words, the rolling mill 10 is configured to be able to measure the amount of roll deflection at both ends in the longitudinal direction of the rolling portion AP.

The selection of the rolling part AP used can be done by human hands. For example, it can also be installed on the upstream side of the conveying direction of the steel bar 1 (the direction through the paper in Figure 1) than the roller pair. A sensor that detects the rolling part AP of the steel bar 1 is performed based on the detection result of the sensor.

Moreover, if the distance sensor 20 moves to the position corresponding to the position of the two ends of the rolling part AP, the control unit 40 detects the aforementioned "roller pair unbent state (deflection) before rolling Zero state)" is the value of the distance sensor 20 and stored in the storage unit 41.

Then, the control unit 40 starts rolling of the steel bar 1 in the rolling mill 10. In addition, during the rolling, two of the first detecting portion P1 and the second detecting portion P2 shown in the upper and lower diagrams of FIG. 3 (located on the upper side of both ends of the rolling portion AP) are located The distance sensor 20 detects the distance to the first roller 14a, and sends the detected value to the control unit 40.

The control unit 40 that receives the detection values of the first detection unit P1 and the second detection unit P2 is as shown in the lower diagram of FIG. 3 and measures (calculates) based on the detection value of the first detection unit P1 The first roller deflection amount X1 measures (calculates) the second roller deflection amount X2 based on the detection value of the second detection unit P2. Here, the dashed line extending in the longitudinal direction shown in the lower diagram of FIG. 3 is a line representing the position of the first roller 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 refer to the detection value of the distance sensor 20 received by the control unit 40 during rolling, and the distance sensor in the zero deflection state The difference between the detected values of the detector 20.

Next, the control unit 40 that measures the first roller deflection amount X1 and the second roller deflection amount X2 performs the first hydraulic pressure so that the thickness of both ends in the longitudinal direction of the steel bar 1 becomes equal. Calculation of the reduction amount (correction amount) of the lower device 12a and the second hydraulic pressure reduction device 12b.

Specifically, first, in the calculation section 42, based on the first roller deflection amount X1 and the second roller deflection amount X2, the following calculation formula is used to calculate: the first detection portion P1 and the second detection portion P2 are opposed to each other The slope in the longitudinal direction of the reference line BL (equivalent to the slope S1 between the two ends).

The slope between the two ends S1=(the first roller deflection amount X1-the second roller deflection amount X2)/(the second distance L2-the first distance L1) Here, as shown in the lower diagram of FIG. 3, the first distance L1 refers to the lengthwise distance from the roller centerline RC to the first detection portion P1, and the second distance L2 refers to the distance from the roller centerline RC to The distance in the longitudinal direction from the second detection part P2. In addition, the support part distance L (used in the calculation formula mentioned later) means the length direction distance from the roller centerline RC to the 1st support part 13a. Moreover, these numerical values are determined according to the position of the rolling part used in the longitudinal direction, the structure of the rolling mill 10, and the like, and therefore are stored in the storage unit 41 in advance.

The calculating part 42 which calculates the slope S1 between both ends calculates the up-down direction correction amount of the 1st support part 13a and the 2nd support part 13b using the following calculation formula.

The correction amount of the first hydraulic pressing device 12a (the first support portion 13a) = ((the first roller deflection amount X1 + the second roller deflection amount X2)/2)-(the slope between the ends S1 × the support portion Distance L) The correction amount of the second hydraulic pressing device 12b (the second support portion 13b) = ((the first roller deflection amount X1 + the second roller deflection amount X2)/2) + (the slope between the ends S1 × the support portion Distance L) The part of "(first roller deflection amount X1+second roller deflection amount X2)/2" in the calculation formula is the average value of the first roller deflection amount X1 and the second roller deflection amount X2 (below , Also known as the average roll deflection); "(Slope between both ends S1×support distance L)" part is to make the slope S1 between the two ends slope along the reference line BL to correct the support part the amount.

In this case, the control section 40 moves the support section connected to each hydraulic pressing device in the vertical direction based on the calculated correction amount. That is, increase the reduction amount corresponding to the average roll deflection, and move the first support portion 13a and the second support portion 13b in the vertical direction so that the inclination of the slope S1 between the ends is along the reference line BL .

Specifically, the correction amount of the first hydraulic pressure reduction device 12a is to compensate for the insufficient reduction amount due to the deflection of the roller, which corresponds to the increase (positive value) of the reduction amount corresponding to the average roller deflection amount, And the sum of the increase (negative value) of the reduction amount in order to make the slope S1 between the two ends along the reference line BL. When it takes a positive value, it becomes the first hydraulic pressure reduction device 12a The increase in the reduction of the first support part 13a moves downward by an amount equivalent to the correction amount. On the contrary, when it takes a negative value, it becomes the reduction of the first hydraulic pressing device 12a The decrease is an amount equivalent to the correction amount by moving the first support portion 13a upward.

In addition, the correction amount of the second hydraulic pressure reduction device 12b is to compensate for the insufficient reduction amount due to the deflection of the roller, which is the increment (positive value) of the reduction amount equivalent to the average roller deflection amount, and to The increase (positive value) of the reduction of the slope S1 between the two ends along the reference line BL is the sum of the two, because the reduction of the second hydraulic pressing device 12b is increased. The 2 support portion 13b moves downward by an amount corresponding to the correction amount more.

In this way, the reduction amount of the first hydraulic pressure reduction device 12a and the second hydraulic pressure reduction device 12b is controlled for the first roller 14a.

Here, as shown in the upper diagram of FIG. 3, since the second roller 14b is also bent in the same manner as the first roller 14a, the second roller 14b must be corrected (controlled) by the hydraulic pressure reduction device. Therefore, in this embodiment, it is assumed that the second roller 14b is also bent in the same manner as the first roller 14a. That is, the same deflection is formed so as to be symmetrical up and down with respect to the center line of the thickness direction (up and down direction) of the steel bar 1.

However, the second roller 14b is not provided with a device or the like for moving it in the vertical direction, so the second roller 14b cannot move. Therefore, in this embodiment, the first roller 14a is moved up and down by the amount of deflection of the first roller 14a and the amount of deflection of the second roller 14b (that is, twice the amount of deflection of the first roller 14a) . By doing so, the reduction amount of the first hydraulic pressure reduction device 12a and the second hydraulic pressure reduction device 12b can be controlled for the first roller 14a and the second roller 14b.

By moving the first roller 14a in the vertical direction as described above, the average roller deflection of the first roller 14a and the second roller 14b can be moved by an equivalent amount, and the slope of the rolling part can be reduced (to make each of the two The slope of the slope between the ends is along the reference line BL). That is, the control unit 40 controls the reduction amount of the first hydraulic pressing device 12a and the reduction amount of the second hydraulic pressing device 12b based on the detection value of the distance sensor 20 to compensate the rollers. The insufficiency of the reduction due to deflection reduces the dimensional error of the steel bar 1, and sets the slope between the two ends in the longitudinal direction of the rolling portion AP of the first roll 14a and the second roll The slope between the two ends in the longitudinal direction of the rolled portion AP of 14b is reduced, and the accuracy of the cross-sectional shape is improved.

In addition, the control unit 40 of this embodiment, if it receives the distance information of the first detection unit P1 and the second detection unit P2 from the distance sensor 20, it immediately executes the calculation of the correction amount in the calculation unit 42, if necessary If it is corrected, the first hydraulic pressure reduction device 12a and the second hydraulic pressure reduction device 12b are controlled by the reduction amount of the hydraulic pressure reduction device and wait for the next transmission from the distance sensor 20. Furthermore, the distance sensor 20 continuously detects the distance between the first detection part P1 and the second detection part P2, and sends the detection result to the control part 40 immediately. In other words, the control unit 40 immediately controls the reduction amount of the first hydraulic pressing device 12a and the reduction amount of the second hydraulic pressing device 12b during the execution of the 1 roll rolling of the steel bar.

===About the effectiveness of the rolling mill 10 of this embodiment === As described above, the rolling mill 10 of this embodiment includes a pair of rollers, a first hydraulic pressing device 12a, and a second hydraulic pressing device 12b. The pair of rollers includes a steel bar 1 for rolling. The first roller 14a and the second roller 14b for rolling, the first hydraulic pressing device 12a and the second hydraulic pressing device 12b are connected to the first support portion 13a and the second support portion 13b, respectively, and are used to allow The first roller 14a moves relative to the second roller 14b. The first support portion 13a and the second support portion 13b are attached to both ends of the first roller 14a. The first roller 14a is rotatably supported, and the rolling portion AP is set at A position where the distance from the first support portion 13a to the rolling portion AP and the distance from the second support portion 13b to the rolling portion AP are different from each other, and the rolling portion AP is provided in a continuous portion in the longitudinal direction of the roller pair The area where the steel bar 1 is rolled. The rolling mill 10 is equipped with a distance sensor 20 and a control unit 40. The distance sensor 20 is configured to measure the roll on the first roll 14a. The amount of roll deflection of the rolling portion AP, the control unit 40 is configured to control the reduction amount of the first hydraulic pressing device 12a and the second hydraulic pressing device 12b based on the detection value of the distance sensor 20 Down the amount. Therefore, high-precision shape control can be realized in the rolling of the steel bar 1 using the non-center rolling mill.

If a non-center rolling mill is used to roll the steel bar 1, the deflection of the roll will cause insufficient reduction and the slope of the rolling part AP of the roll, resulting in dimensional errors of the steel bar 1, and the The thickness of both ends of the rolled steel bar 1 in the longitudinal direction is different, so there are problems such as poor shape accuracy of the cross section of the steel bar 1 and bending in the longitudinal direction of the steel bar 1.

In contrast, the rolling mill 10 of the present embodiment includes a distance sensor 20 and a control unit 40. The distance sensor 20 is configured to measure the roll deflection in the rolling portion AP of the first roll 14a. The control unit 40 is configured to control the reduction amount of the first hydraulic pressure reduction device 12a and the reduction amount of the second hydraulic pressure reduction device 12b based on the detection value of the distance sensor 20. That is, by using the distance sensor 20 to detect the deformation of the first roller 14a, the deformation of the roller pair generated during the rolling can be directly grasped, and the roller deflection of the rolling portion AP can be measured based on the deformation. Curvature. In addition, the control unit 40 controls the reduction amount of the first hydraulic pressure reduction device 12a and the reduction amount of the second hydraulic reduction device 12b in response to the amount of roll deflection, thereby using a non-center rolling mill. High-precision shape control can be achieved during the rolling of the bar steel 1.

In addition, in this embodiment, it is comprised so that the amount of roll deflection at both ends in the longitudinal direction of the rolled portion AP can be measured. Therefore, by correcting the reduction amount of the hydraulic pressing device based on the amount of roll deflection at both ends in the longitudinal direction of the rolling portion AP, the insufficient amount of reduction caused by the roll deflection can be compensated for. The dimensional error of the steel bar 1 is reduced, and the slope between the two ends in the longitudinal direction of the rolling portion AP of the first roller 14a and the longitudinal direction of the rolling portion AP of the second roller 14b are set to both The slope between the ends is reduced, and high-precision shape control can be realized.

In addition, in the present embodiment, the control unit 40, during the execution of the rolling of the steel bar 1, is to adjust the reduction amount of the first hydraulic reduction device 12a and the reduction amount of the second hydraulic reduction device 12b. Control instantly. In other words, by allowing the control unit 40 to control the reduction amount of the hydraulic pressure reduction device in real time, when the control of the reduction amount of the hydraulic pressure reduction device becomes necessary, the control can be performed quickly. In other words, in the rolling of the bar steel 1 using a non-center rolling mill, it is possible to realize more precise shape control.

In addition, in the present embodiment, the rolling part AP is set in plural at different positions in the longitudinal direction of the roller pair. In other words, the present invention can be applied to all the rolling portions AP in which a plurality of rolling portions AP are set at different positions in the longitudinal direction of the roller pair. That is, no matter which rolling part AP is used to roll the steel bar 1, high-precision shape control can be achieved.

In addition, in this embodiment, a movable support device 30 that supports the distance sensor 20 movably in the longitudinal direction is provided. That is, when the rolling part AP is changed to another rolling part AP, the movable supporting device 30 allows the distance sensor 20 to move to the changed rolling part AP, and the moved distance sensor can be used 20 to detect the value of the changed rolling part AP. Therefore, compared to the case where the distance sensors 20 are provided in the plurality of rolling parts AP, the distance sensors 20 can be reduced.

In addition, in the present embodiment, the movable support device 30 is provided with: a mounting portion 30a to which the distance sensor 20 is mounted, a rail portion 30b to which the mounting portion 30a is slidably engaged, and a mounting portion 30a along the rail portion 30b Mobile driving device. That is, with the simple structure of the mounting portion 30a, the rail portion 30b, and the driving device, a reliable movable support device 30 can be realized.

===Other implementation forms=== As mentioned above, the rolling mill 10 of the present invention has been described based on the above-mentioned embodiment. However, the above-mentioned embodiment of the present invention is for easy understanding of the present invention, but the present invention is not limited to the above-mentioned embodiment. The present invention can be changed and improved without departing from the spirit of the present invention. Of course, the present invention also includes its equivalents.

In addition, in the above-mentioned embodiment, although the roller pair is a smooth roller, it is not limited to this. For example, it can also be a groove provided with a caliber (caliber, a groove provided in a pair of rollers, formed into the same groove shape as the cross-sectional shape of the steel bar 1 to be rolled, and the steel bar 1 is formed by passing through the groove). The cross-sectional shape is equivalent to the roller pair of the rolling part AP) in the above embodiment. In other words, in the rolling portion AP, the first roller 14a and the second roller 14b can be provided with a pass.

In rolling using a pair of rolls provided with a pass, because it is configured as a non-center rolling mill to perform rolling (frequently performed), the present invention can work more effectively.

In addition, in the above-described embodiment, the balance cylinder mechanism 50 is provided on the upper side of the first roller 14a, and the movable support device 30 is provided on the lower side of the balance beam 51, but it is not limited to this. For example, as shown in FIG. 4, the installation position of the movable support device 30 can be changed, and the balance cylinder mechanism 50 can be replaced with the 1st support part balance cylinder 60a and the 2nd support part balance cylinder 60b.

Fig. 4 is a schematic front view of the rolling mill 10 of the second embodiment. As shown in FIG. 4, the differences from the first embodiment include: the movable support device 30 is provided on the upper side of the housing 11, instead of the balance cylinder mechanism 50, a first support portion balance cylinder 60a is provided on the first support portion 13a. , And a second support portion balance cylinder 60b is provided in the second support portion 13b.

In addition, as a modification of the second embodiment, for example, as shown in FIG. 5, 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 a rolling mill 10 of the third embodiment.

As shown in FIG. 5, the difference from the second embodiment is that the 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 side of the fixed beam 70.

In the first embodiment, it is caused by the difference in the reduction load (measured value measured by the first load cell 15a and the second load cell 15b) between the first support portion 13a side and the second support portion 13b side The resulting inclination of the first roller 14a (the difference between the height position of the first support portion 13a and the second support portion 13b) is corrected by the AGC function, so the balance beam 51 (track The portion 30b) is always kept horizontal, and the control portion 40 can accurately measure the amount of roll deflection itself 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 using the AGC function, and the control portion 40 cannot accurately measure the amount of roll deflection based on the detection value of the distance sensor 20. Therefore, the control unit 40 of the second embodiment and the third embodiment corrects the displacement caused by the longitudinal deflection of the housing 11 for the detection value of the distance sensor 20, and calculates it based on the corrected value. The reduction amount of the hydraulic pressure reduction device 12a and the hydraulic pressure reduction device 12b is controlled.

In addition, in the above embodiment, the distance sensor 20 is provided only on the upper side of the first roller 14a, but it is not limited to this. For example, it may be provided only on the lower side of the second roller 14b, and may be provided on both the upper side of the first roller 14a and the lower side of the second roller 14b. However, in order to avoid being splashed by the cooling water used during rolling, it is preferably provided on the upper side of the first roll 14a.

When the distance sensor 20 is provided only on the lower side of the second roller 14b, the control unit 40 may perform the calculation described in the above embodiment for the rolling part AP of the second roller 14b. In addition, when the distance sensor 20 is provided on both the upper side of the first roller 14a and the lower side of the second roller 14b, the control unit 40 only needs to apply the calculation described in the above embodiment to the rolling portion AP of the first roller 14a. The rolling part AP of the second roller 14b is performed separately, and according to the respective calculation results (it is not assumed that any one of the rollers forms the same deflection in a symmetrical manner with respect to the center line in the vertical direction of the steel bar 1) It is only necessary to calculate and control the reduction amount of the first hydraulic pressure reduction device 12a and the second hydraulic pressure reduction device 12b.

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

In addition, in the above-mentioned embodiment, the distance sensor 20 is moved in the longitudinal direction by providing the movable support device 30, but it is not limited to this. For example, the distance sensor 20 may be provided for all of the plurality of set rolling parts AP and may be configured to be immovable. In other words, each of the plurality of rolling parts AP set at different positions may be provided with at least one distance sensor 20. In this case, a mechanism for moving the distance sensor 20 can be omitted, so the structure of the distance sensor 20 can be simplified.

In addition, in the above-mentioned embodiment, although the control of the rolling mill 10 using the two distance sensors 20 was demonstrated, it is not limited to this. For example, three or more distance sensors 20 may be used to control the rolling mill 10.

1‧‧‧Bar steel 10‧‧‧Rolling mill 11‧‧‧Shell 12a‧‧‧The first hydraulic pressure reduction device 12b‧‧‧The second hydraulic pressure reduction device 13a‧‧‧The first supporting part 13b‧‧‧Second supporting part 14a‧‧‧The first roller 14b‧‧‧The second roller 15a‧‧‧The first load element 15b‧‧‧The second load element 20‧‧‧Distance Sensor 30‧‧‧Movable supporting device 30a‧‧‧Installation Department 30b‧‧‧Track Department 32‧‧‧Drive 40‧‧‧Control Department 41‧‧‧Storage Department 42‧‧‧Computer Department 50‧‧‧Balance cylinder mechanism 50a‧‧‧The first balance cylinder 50b‧‧‧The second balance cylinder 51‧‧‧Balance beam 60a‧‧‧The first supporting part balance cylinder 60b‧‧‧The second supporting part balance cylinder 70‧‧‧Fixed beam AP‧‧‧Rolling part P1‧‧‧The first detection part P2‧‧‧Second Detection Section S1‧‧‧The slope between the two ends X1‧‧‧The first roller deflection X2‧‧‧The second roller deflection RC‧‧‧Roller centerline BL‧‧‧Baseline L1‧‧‧First distance L2‧‧‧2nd distance L‧‧‧Support distance

Fig. 1 is a schematic front view of a rolling mill 10 of the present embodiment. FIG. 2 shows the relationship between the control unit 40 of the rolling mill 10 and other devices. The top view of FIG. 3 is a diagram showing a state where the steel bar 1 is pinched and rolled while the roller pair is deflected, and the bottom view of FIG. 3 is an explanatory diagram for explaining the amount of roll deflection of the first roll 14a. Fig. 4 is a schematic front view of the rolling mill 10 of the second embodiment. Fig. 5 is a schematic front view of a rolling mill 10 of the third embodiment.

1‧‧‧Bar steel

10‧‧‧Rolling mill

11‧‧‧Shell

12a‧‧‧The first hydraulic pressure reduction device

12b‧‧‧The second hydraulic pressure reduction device

13a‧‧‧The first supporting part

13b‧‧‧Second supporting part

14a‧‧‧The first roller

14b‧‧‧The second roller

15a‧‧‧The first load element

15b‧‧‧The second load element

20‧‧‧Distance Sensor

30‧‧‧Movable supporting device

30a‧‧‧Installation Department

30b‧‧‧Track Department

50‧‧‧Balance cylinder mechanism

50a‧‧‧The first balance cylinder

50b‧‧‧The second balance cylinder

51‧‧‧Balance beam

AP‧‧‧Rolling part

RC‧‧‧Roller centerline

Claims (9)

A rolling mill is provided with a roller pair, a first hydraulic pressure reduction device, and a second hydraulic pressure reduction device. The roller pair includes a first roller and a second roller for rolling a steel bar as a rolling target. The rollers, the first hydraulic pressing device and the second hydraulic pressing device are respectively connected to the first support portion and the second support portion and are used to move the first roller relative to the second roller, The first support portion and the second support portion are configured to rotatably support the first roller at both ends of the first roller, and are characterized in that the rolling portion is set to allow the rolling from the first support portion to the roller The distance between the part and the distance from the second support part to the rolling part are different from each other. The rolling part is a continuous area provided in a part of the longitudinal direction of the roller pair, and is used to connect the strip The part where the steel is rolled. The rolling mill is equipped with a distance sensor and a control unit. The distance sensor is configured to measure the rolling of at least one of the first roller and the second roller Part of the roll deflection amount, the control unit is configured to control the reduction amount of the first hydraulic pressing device and the reduction amount of the second hydraulic pressing device based on the detection value of the distance sensor . The rolling mill according to claim 1, wherein the rolling portion is different in the longitudinal direction of the pair of rolls Multiple positions are set. The rolling mill according to claim 2, wherein each of the plurality of rolling parts set at different positions is provided with at least one distance sensor. The rolling mill according to claim 1 or 2, which is provided with a movable support device that supports the distance sensor so as to be movable in the longitudinal direction. The rolling mill according to claim 4, wherein the movable support device is provided with: a mounting portion to which the distance sensor is mounted, a rail portion to which the mounting portion is slidably engaged, and the mounting portion along The driving device for the movement of the aforementioned rail. The rolling mill according to claim 1 or 2, which is configured to be able to measure the amount of deflection of the roller at both ends in the longitudinal direction of the rolling portion. The rolling mill according to claim 1 or 2, wherein the control unit is configured to, during execution of the rolling of the steel bar, combine the reduction amount of the first hydraulic reduction device and the second hydraulic reduction The pressing amount of the pressing device is instantly controlled. The rolling mill according to claim 1 or 2, wherein in the rolling section, the first roll and the second roll are respectively provided with a groove. A method for controlling a rolling mill, the rolling mill is provided with a pair of rollers, a first hydraulic pressing device, and a second hydraulic pressing device. The roller pair includes a method for rolling a steel bar as a rolling object. The first roller and the second roller, the first hydraulic pressing device and the second hydraulic pressing device are connected to the first support portion and the second support portion, respectively, and are used to allow the first roller to be relative to the second support. 2 The rollers move, and the first support portion and the second support portion are rotatably supported by the first roller at both ends of the first roller, and it is characterized in that the system includes the following steps: setting the rolling part at Where the distance from the first supporting portion to the rolling portion and the distance from the second supporting portion to the rolling portion are different from each other, the rolling portion is provided in a part of the longitudinal direction of the roller pair The continuous area is the part for rolling the steel bar. The amount of roll deflection in the rolling portion of at least one of the first roll and the second roll is measured based on the amount of roll deflection The reduction amount of the first hydraulic pressure reduction device and the reduction amount of the second hydraulic pressure reduction device are controlled.

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