JP2004174535A - Device for straightening rolled stock - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely guide a bent rolled stock to a straightening stand and to perform satisfactory straightening. <P>SOLUTION: The straightening device 5 is provided with the straightening stand 10 and a guiding means 20. The straightening stand 10 has a plurality of straightening rolls 12 which are alternately arranged up and down along the conveying route of the rolled stock 1. The guiding means 20 has a first side guide 21 and a second side guide 22 which are faced each other across the conveying route in the vicinity of the inlet of the straightening stand 10. The base end part of the first side guide 21 is rotatable and rotated by a moving means 30 so as to be brought close to and driven away from the conveying route. A control part 40 controls the moving means 30 by responding to a detected signal of the tip of the rolled stock from a detection means 44 arranged in the vicinity of the outlet of the straightening stand 10 and brings the position of the first side guide close to the conveying route of the rolled stock from the initial position in a straightening stage. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an apparatus and a method for straightening a rolled material, and more particularly to an improvement in means for guiding a rolled material before entering a straightening stand.
[0002]
[Prior art]
A rolled material having an asymmetric cross-sectional shape is bent in a cooling process after hot rolling. For example, if one side is thick and the other side is thin, cooling of the thin part progresses in the rolling step, and cooling of the thick part does not progress in the rolling step. Therefore, when cooled by the cooling floor after rolling, the shrinkage in the thick portion becomes larger than that in the thin portion, and the rolled material tends to bend so that the thick portion is on the inside and the thin portion is on the outside. When the asymmetry of the cross-sectional shape of the rolled material increases, this bending exceeds the allowable range.
[0003]
Usually, in order to keep the bending of the rolled material within the standard allowable range as described above, the rolled material is straightened by a roller straightening device. This straightening device includes a straightening stand and guide means arranged near the entrance of the straightening stand. The straightening stand has a plurality of straightening rolls arranged alternately above and below the rolled material along the conveying path. The rolled material is straightened while passing through the straightening roll. The guide means serves to guide the bent rolled material to the straightening stand.
[0004]
The guide means includes a pair of side guides facing each other across the transport path of the rolled material. These side guides are plate-shaped, with the base end (the end farther from the correction stand) supported rotatably, and the tip end (the end closer to the correction stand) inclined so as to approach the transport path. are doing. Conventionally, the positions of the tip portions of these side guides are manually set in advance to standard positions set according to the cross-sectional shape and dimensions of the rolled material, and in some cases, empirical manual adjustment is performed by further checking the bending situation. After that, a number of rolled material straightening processes are performed. The conventional straightening device described here is a device actually used in a factory of the applicant.
[0005]
[Problems to be solved by the invention]
In the straightening device, since the position of the side guide is set in advance before the process of straightening the rolled material is started, there is a disadvantage that the straightening cannot be performed reliably. That is, if the tip of the side guide is too close to the transport path, the rolled material having a large bend cannot be guided to the straightening stand, and if the tip of the side guide is too far from the transport path, the rolled material is guided. However, the posture of the rolled material biting into the straightening roll is not stable, and the straightening cannot be performed.
In addition, if the bending changes over time, the bending outside the range predicted by the standard, or the bending form of the rolled material changes significantly, it is necessary to reset the side guides, which causes a decrease in work efficiency. ing.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the rolled material straightening device of the present invention,
(A) a straightening stand having a plurality of straightening rolls alternately arranged above and below the rolled material along a transport path,
(B) guide means including first and second side guides facing each other across the transport path of the rolled material near the entrance of the straightening stand;
(C) moving means for moving the first side guide so as to approach or move away from the transport path of the rolled material;
(D) detecting means for detecting a rolled material near the exit of the straightening stand;
(E) control means for adjusting the position of the first side guide by controlling the moving means in response to a detection signal of the leading end of the rolled material from the detecting means;
It is characterized by having.
[0007]
According to the above configuration, the initial position of the first side guide immediately before the rolled material is carried into the straightening stand, and the position of the first side guide during straightening after the rolled material is carried into the straightening stand, The optimum position can be set according to the degree of bending or the form of bending that occurs due to the cross-sectional shape and dimensions of the rolled material. As a result, the rolled material can be reliably carried into the straightening stand, and the rolled material being straightened can be stably bited into the straightening roll, so that the bending of the rolled material can be reliably corrected.
[0008]
Preferably, the control means activates a timer when the detecting means detects the leading end of the rolled material, and controls the moving means in accordance with an elapsed time measured by the timer, whereby the first side guide of the first side guide is controlled. Adjust the position. According to this, since the position of the first side guide can be adjusted with good timing during the straightening, the biting posture of the rolled material into the straightening roll can be further stabilized.
[0009]
The control means may move the first side guide from the initial position to approach the rolled material conveying path in response to the detection of the leading end of the rolled material by the detection means. According to this configuration, when the way of bending the rolled material is simple, the biting posture of the rolled material into the straightening roll can be stabilized with a simple control.
[0010]
Preferably, the first and second side guides have a plate shape, and the first side guide has a base end remote from the correction stand rotatably supported and a distal end near the correction stand. It is rotated by the moving means so as to approach or move away from the transport path. According to this configuration, the first side guide can guide the rolled material in the inclined posture, and can more reliably guide the rolled material to the correction stand.
[0011]
Preferably, the guide means further includes third and fourth plate-shaped side guides. The third and fourth side guides face each other with the transport path interposed therebetween, and are in contact with the first and second side guides. A base end remote from the straightening stand is rotatably supported and can be rotated and adjusted prior to performing a process of straightening a large number of rolled materials. According to this configuration, the paired side guides are arranged in two steps, and the first, third, and fourth side guides can guide the rolled material in an inclined posture, so that the rolled material can be more reliably fixed on the straightening stand. Can be delivered to In addition, the third and fourth side guides are arranged between the first side guide and the straightening stand, and the first side guide can be separated from the straightening stand. It becomes easy to adjust the biting position, and the biting position can be further stabilized.
[0012]
In the rolling straightening method of the present invention, the rolled material is guided to the entrance of the straightening stand by guide means including first and second side guides facing each other across the transport path. By a plurality of straightening rolls arranged alternately up and down along the transport path, to correct the bending of the rolled material, and after the leading end of the rolled material comes out of the outlet of the straightening stand, the first side guide is moved. The position is adjusted.
[0013]
According to the above method, the initial position of the first side guide immediately before the rolled material is carried into the straightening stand, and the position of the first side guide during straightening after the rolled material is carried into the straightening stand, The position can be adjusted to the optimum position in accordance with the degree of bending and the form of bending caused by the cross-sectional shape and dimensions of the rolled material. As a result, the rolled material can be reliably carried into the straightening stand, and the rolled material being straightened can be stably bited into the straightening roll, so that the bending of the rolled material can be reliably corrected.
Preferably, in the above method, the guide means further includes third and fourth plate-shaped side guides. The third and fourth side guides face each other with the transport path interposed therebetween. , Are arranged between the second side guide and the straightening stand, and adjust the positions of the third and fourth side guides before the execution of the process of straightening a large number of rolled materials. This makes it easier to adjust the biting position of the rolled material by adjusting the position of the first side guide, and this biting position can be further stabilized.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a straightening device according to an embodiment of the present invention will be described with reference to the drawings. First, a rolled material 1 which is a main object of the straightening according to the present invention will be described with reference to FIG. The rolled material 1 is an unequal-thickness angle steel (invert angle) having an asymmetric cross-sectional shape, and has a narrow thick portion 1a and a wide thin portion 1b orthogonal to each other. In the process of cooling the rolled material 1 on the cooling floor after hot rolling, the rolled material 1 tends to bend greatly so that the thick portion 1a is on the inside and the thin portion 1b is on the outside.
[0016]
As shown in FIG. 1, a rolled material 1 in a bent state is carried into a straightening device 5 by a long conveyor 2. On both sides of the conveyor 2, elongated guide walls 3, 3 constituted by erecting plate members are arranged to prevent the rolled material 1 from protruding from the conveyor 2.
[0017]
The straightening device 5 includes a straightening stand 10 and guide means 20 as main components. As shown in FIG. 3, the straightening stand 10 includes a plurality of straightening rolls 11 and 12 alternately arranged above and below the transport path along a transport path of the rolled material 1 (a path extending on an extension of the transport conveyor 2). have. In this embodiment, four straightening rolls 11 are arranged on the upper side, and three straightening rolls 12 are arranged on the lower side. FIG. 1 shows only the upper straightening roll 11 in the first stage and the upper straightening roll 11 in the final stage. The upper straightening roll 11 is supported by a driving unit 13 in a cantilevered or double-sided manner and is driven to rotate in the same direction. The lower straightening roll 12 is cantilevered or supported by a supporting unit (not shown). It is supported in a free-rotating state with both ends.
[0018]
The upper correction roll 11 has a peripheral shape corresponding to the upper surface shape of the rolled material 1, and the lower correction roll has a peripheral shape corresponding to the lower surface shape of the rolled material 1. In this embodiment, since the rolled material 1 is conveyed so that the intersection of the thick portion 1a and the thin portion 1b is directed upward, the upper straightening roll 11 has a valley shape, and the lower straightening roll 12 Has a mountain shape.
[0019]
The guide means 20 is disposed between the correction stand 10 and the guide wall 3. In other words, it is arranged near the entrance of the correction stand 10. The guide means 20 includes four plate-shaped side guides 21, 22, 23, and 24. The first side guide 21 and the second side guide 22 face each other across the transport path of the rolled material 1. The first side guide 21 is rotatably supported on the floor at a base end (an end farther from the correction stand 10), and is rotated by a moving unit 30 described later to thereby provide a distal end (correction stand). 10 is closer to or away from the transport path. In addition, a vertical roller 21 a is rotatably attached to the tip of the first side guide 21. The second side guide 22 is fixed to the floor so as not to move parallel to the transport path. Note that the second side guide 22 may be configured by an extension of the guide wall 3.
[0020]
The third side guide 23 and the fourth side guide 24 face each other across the transport path, and are disposed between the side guides 21 and 22 and the correction stand 10. These side guides 23 and 24 also have a base end (an end farther from the correction stand 10) rotatably supported on the floor, and a front end (an end closer to the correction stand 10) has a vertical roller 23a. , 24a are rotatably mounted.
[0021]
Next, the moving means 30 for rotating the first side guide 21 will be described in detail with reference to FIG. The moving means 30 includes a motor 32 fixed to a box 31. A screw rod 33 is supported by the box 31 so as to be movable in the axial direction. The screw rod 33 is substantially orthogonal to the transport path, and the tip is rotatably and slidably connected to the outer surface of the first side guide 21 via a joint 34. A gear (not shown) is connected to the screw rod 33 in the box 31, and the gear is connected to an output shaft of the motor 32 via a power transmission mechanism 35.
[0022]
When the motor 32 is driven, the forward / reverse rotation of the motor 32 is reduced by the power transmission mechanism 35 and transmitted to the gear, and the rotation of the gear causes the screw rod 33 to move forward or backward. Are rotated in the closing direction (the direction in which the distal end approaches the transport path) and the opening direction (the direction in which the distal end moves away from the transport path) about the support shaft 21b at the base end.
[0023]
The box 31 is also provided with a rotary encoder 39. The rotary encoder 39 detects the amount of advance and retreat of the screw rod 33 by detecting the amount of rotation of the gear, and as a result, obtains information on the angle of the first side guide 21 or the tip position of the first side guide 21. It has become. Note that a linear scale that directly measures the position of the screw rod can be used instead of the rotary encoder 39.
[0024]
As shown in FIG. 1, the motor 32 is controlled by a side guide position control unit 40 (control means) including an operation panel. Note that an operation signal and a set value signal from the operation / setting unit 41 are input to the control unit 40 as described later. The control unit 40 also receives a detection signal from the rotary encoder 39 and a signal from a limit switch 43 that is provided near the first side guide 21 and detects a closing limit position and an opening limit position of the first side guide 21. It has become so. Further, a photoelectric switch 44 (rolled material detecting means) is disposed near the exit of the correction stand 10, and a detection signal of the photoelectric switch 44 is also input to the control unit 40.
[0025]
Next, the operation of the correction device 5 having the above configuration will be described. First, the positions of the third side guide 23 and the fourth side guide 24 are adjusted according to the cross-sectional shape and dimensions of the rolled material 1. These side guides 23 and 24 are basically inclined such that their distal ends are closer to the transport path than their proximal ends, and the position of these distal ends is manually adjusted. The mechanism for this manual adjustment is similar to the moving means 30, and the motor 32 and the power transmission mechanism 35 are omitted from the moving means 30 and a manual handle is added. The gear connected to the screw rod 33 is rotated by the handle operation, and the position of the side guides 23 and 24 is adjusted by the screw rod 33 moving forward and backward. These side guides 23 and 24 are maintained at the adjustment positions during the process of correcting a large number of rolled materials 1.
[0026]
When the automatic operation switch of the operation / setting unit 41 is turned on, the control unit 40 drives the motor 32 to move the first side guide 21 to the initial target position set by the operation setting unit 41. In this initial position, the first side guide 21 is inclined with respect to the transport path as shown by a dotted line in FIG. That is, the distal end of the first side guide 21 is located closer to the transport path than the base end. The distal end of the first side guide 21 is located at a position equal to or slightly closer to the base end of the third side guide 23 when viewed from the transfer path. Away from
[0027]
As described above, the loading of the rolled material 1 is waited in a state where the first side guide 21 is at the initial position. The rolled material 1 is guided by the guide walls 3 and 3 and further guided by four side guides 21 to 24 and enters the straightening stand 10. At this time, the side guides 21, 23, 24 are inclined so as to approach the transport path toward the front end, and the interval between the side guides 21, 22 is narrower than the guide walls 3, 3. Since the space between the rolls 24 is smaller than the side guides 21 and 22, the rolled material 1 can reach the first-stage straightening roll 11 of the straightening stand 10 while being smoothly guided.
[0028]
When the leading end of the rolled material 1 comes out of the exit of the straightening stand 10, the photoelectric switch 44 detects this and turns on, and sends an ON signal to the control unit 40. Then, the control unit 40 drives the motor 32 at a predetermined timing (for example, one second after the detection of the leading end of the rolled material 1), and rotates the first side guide 21 to the target position set in the closing direction. The timing and the target position are set by the operation / setting unit 41. As a result, the leading end of the first side guide 21 approaches the transport path, and pushes the bent rolled material 1 via the vertical roller 21a. As a result, the posture in which the rolled material 1 bites into the straightening rolls 11 and 12 can be stabilized, and the rolled material 1 can be favorably corrected in the straightening stand 10.
[0029]
When the rolled material 1 passes through the straightening stand 10 and its end passes through the photoelectric switch 44, the photoelectric switch 44 is turned off, and in response to this, the control unit 40 drives the motor 32 to re-activate the first side guide. Return to the initial target position and wait for the next rolled material 1.
[0030]
The above-described first control mode is the simplest, and can perform more complicated control. For example, the rolled material 1 may be bent in the opposite direction at the rear end depending on the rolling conditions, cooling conditions, and the like, to form an S-shape. In response to this, for example, control may be performed such that the first side guide 21 is moved in the opening direction several tens seconds after the detection of the leading end of the rolled material 1 (hereinafter, this is referred to as a second control mode). ).
[0031]
Next, a control routine executed by the control unit will be described in detail with reference to FIGS. In this control routine, any of the first and second control modes described above can be executed, and the position of the first side guide 21 can be adjusted with higher accuracy in accordance with the elapsed time from the detection of the leading end of the rolled material 1. It can also be adjusted.
[0032]
When the control routine starts, first, set value information is input from the operation / setting unit 41 (step S1). In the operation / setting section 41, the operator sets one or more operation timings of the first side guide 21 in the correction process in advance. In the first control mode described above, the operation timing is one time, and in the second control mode, the operation timing is two times. Further, the target positions of the first side guide 21 at these operation timings are set (target position setting during correction). Further, an initial target position of the first side guide 21 when the rolled material 1 is on standby is also set (target position setting upon input). As described later, these target positions are used repeatedly for each rolled material 1.
[0033]
Next, it is determined whether or not the automatic operation switch of the operation / setting unit 41 is turned on, that is, whether or not the automatic operation is activated, and the process waits until the automatic operation is activated (step S2). When the automatic operation is started, the motor 32 is driven to move the first side guide 21 toward the carry-in target position (step S3). This movement control is performed while feeding back the position information of the rotary encoder 39. It is determined whether or not the first side guide 21 has reached the carry-in target position (step S4). The movement of the first side guide 21 is continued until the first side guide 21 reaches the carry-in target position. To stop the first side guide 21 (step S5).
[0034]
Next, it is determined whether or not the photoelectric switch 44 is turned on, that is, whether or not the rolled material 1 is carried in and its tip has passed through the straightening stand 10 and has reached the outlet (step S6). It waits until the photoelectric switch 44 is turned on. When it is determined that the photoelectric switch 44 is turned on, the timer operation of the timer starts (step S7).
[0035]
Next, it is determined whether or not the elapsed time by the timer has reached the set operation timing (step S8), and waits until the operation timing is reached. When the elapsed time reaches the operation timing, the motor 32 is driven to move the first side guide 21 toward the correction target position (step S9). Then, it is determined whether or not the first side guide 21 reaches the target position during correction (step S10), and the movement of the first side guide 21 is continued until reaching the target position. 32, and the first side guide 21 is stopped (step S11). Even if the first side guide 21 does not reach the target position during correction, when the detection signal from the limit switch 43 indicating that the first side guide 21 has reached the open limit position and the close limit position is received, the motor 32 is forcibly turned off. Then, the first side guide 21 is stopped (steps S12 and S11).
[0036]
After the stop operation of the first side guide 21 in step S11, it is determined whether or not the movement of the first side guide 21 has been performed at the final operation timing (step S12). If a negative determination is made here, the process returns to step S8 to control the first side guide 21 at the next operation timing. When an affirmative determination is made in step 12, the process proceeds to step 13, where it is determined whether or not the photoelectric switch 44 has been turned off, that is, whether or not the end of the rolled material 1 has passed through the exit of the straightening stand 10. When the end of the rolled material 1 is detected in step 13, the process proceeds to step 14, where it is determined whether the automatic operation switch is on. If an affirmative determination is made here, the process returns to step S3 to prepare for the next rolled material 1 to be carried in, and the same control is repeated thereafter. When it is determined in step 14 that the automatic operation switch has been turned off, the control routine ends.
[0037]
The present invention is not limited to the above embodiment, and various modes can be adopted. For example, the present invention can also be applied to straightening of a rolled material obtained by cold rolling. The position of the first side guide may be adjusted immediately upon receiving the leading end detection signal without detecting the elapsed time from the leading end detection of the rolled material by the timer. The second side guide may be configured similarly to the first side guide, and the position may be controlled in response to the detection of the leading end of the rolled material. The side guide may be controlled by adding another detection signal, for example, a detection signal of a load pressing the side guide to the rolled material.
[0038]
In particular, when straightening a long product as it is after rolling, bending due to the restriction of the floor contact portion in the cooling floor also occurs, so the bending becomes large or the bending shape is not a simple bow warp. It may be a bend. In addition, in hot rolling for a long time, the bending of the rolled material changes due to the difference in the steel type of the steel material, the change in the heating state of the slab, the difference in the rolling elongation length, that is, the bending changes over time. Sometimes. In order to cope with such uneven bending, the control unit 40 stores a plurality of bending patterns, and the operation / setting unit 40 controls the operation / setting unit 40 in accordance with the bending state of the rolled material being conveyed by the driver. A bending pattern may be specified. In this case, the position of the first side guide is time-controlled according to the selected bending pattern.
[0039]
【The invention's effect】
As described above, according to the present invention, the rolled material can be reliably carried into the straightening stand, and the biting posture of the rolled material being straightened into the straightening roll is stabilized to reliably correct the bent of the rolled material. be able to.
[Brief description of the drawings]
FIG. 1 is a plan view of a rolled material straightening apparatus according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a rolled material whose bending is corrected by the apparatus.
FIG. 3 is a side view of a correction stand in the apparatus.
FIG. 4 is a perspective view showing a moving means of a first side guide in the apparatus.
FIG. 5 is a flowchart showing a first half of a moving means control routine executed by a control unit of the apparatus.
FIG. 6 is a flowchart showing a latter half of a moving means control routine executed by the control unit of the apparatus.
[Explanation of symbols]
Reference Signs List 1 rolled material 10 straightening stands 11, 12 straightening roll 20 guide means 21 first side guide 22 second side guide 23 third side guide 24 fourth side guide 30 moving means 40 side guide position control unit (control means)
44 photoelectric switch (detection means)

Claims (7)

In the device to correct the bending of the rolled material,
(A) a straightening stand having a plurality of straightening rolls alternately arranged above and below the rolled material along a transport path,
(B) guide means including first and second side guides facing each other across the transport path of the rolled material near the entrance of the straightening stand;
(C) moving means for moving the first side guide so as to approach or move away from the transport path of the rolled material;
(D) detecting means for detecting a rolled material in the vicinity of the exit of the straightening stand;
(E) control means for adjusting the position of the first side guide by controlling the movement means in response to a detection signal of the leading end of the rolled material from the detection means;
A straightening device for a rolled material, comprising: The control means adjusts the position of the first side guide by operating a timer when the detection means detects the leading end of the rolled material and controlling the movement means in accordance with the elapsed time measured by the timer. The straightening device for a rolled material according to claim 1, wherein the straightening is performed. The control means moves the first side guide from the initial position to approach the rolled material conveying path in response to the detection of the leading end of the rolled material by the detection means. A device for straightening a rolled material according to claim 1. The first and second side guides each have a plate shape, and the first side guide has a base end farther from the correction stand rotatably supported, and a tip end closer to the correction stand has a transport path. The device for correcting a rolled material according to any one of claims 1 to 3, wherein the device is rotated by the moving means so as to approach or move away from the rolled material. The guide means further includes third and fourth plate-shaped side guides, and the third and fourth side guides face each other with the transport path interposed therebetween. The base end remote from the straightening stand is rotatably supported, and is rotatable before execution of a process of correcting a large number of rolled materials. An apparatus for straightening a rolled material according to the above. The rolled material is guided to the entrance of the straightening stand by guide means including first and second side guides facing each other across the transport path, and the straightening stand alternately moves up and down along the transport path of the rolled material by the straightening stand. In the method of correcting the bending of the rolled material by a plurality of straightening rolls arranged in,
A method for correcting a rolled material, wherein the position of the first side guide is adjusted by moving the first side guide after the leading end of the rolled material comes out of the exit of the straightening stand. The guide means further includes third and fourth plate-shaped side guides, and the third and fourth side guides face each other with the transport path interposed therebetween. The straightening method for a rolled material according to claim 6, wherein the third and fourth side guides are adjusted in position prior to execution of a process of correcting a large number of rolled materials.

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