JP5515855B2 - Coil box - Google Patents

Description

  The present invention relates to a coil box disposed between a rough rolling mill and a finish rolling mill of a hot rolling facility.

  The hot rolling equipment is composed of a heating furnace, a rough rolling mill, a finish rolling mill, etc., and between the rough rolling mill and the finishing rolling mill, the rolled material (strip-shaped plate material) is wound in a coil shape and conveyed. The coil box is provided. By winding the rolled material in the coil box, the manufacturing line length is shortened, and at the same time, the material temperature of the rolled material is prevented from being lowered, and the time for making the coiled coil temperature uniform is gained.

  Usually, in the coil box, after rolling the rolled material once at the winding position, the rolled material is transported to the rewinding position and the rolled material is rewound. At that time, the coil is transported from the winding position to the rewinding position by a transport device such as a mandrel system described in Patent Document 1 or a transport roll system described in Patent Documents 2 and 3.

  In the mandrel system of Patent Document 1, a mandrel called a mandrel is inserted into the inner diameter portion (coil center) of the coil, and a revolving arm holding the mandrel at the tip is swiveled to rewind the coil from the winding position. Transport to. In the transport roll method of Patent Documents 2 and 3, the coil is transported from the winding position to the rewind position by rolling the coil on the transport roll.

  The rolled material conveyed in this way is wound up, causing the coil to be wound around the tail end portion of the rolled material and warping toward the coil center side. If such a wrap is left in the tail end portion and proceeding to the finish rolling step, the warp may be folded back and rolled in a double stacked state, which is likely to cause a problem. For this reason, the correction of the warping of the tail end portion is usually performed by inserting a correction pin into the inner diameter portion of the coil in the rewinding operation and rewinding the tail end portion along the correction pin.

  In the mandrel method of Patent Document 1, since the mandrel inserted into the inner diameter portion of the coil can be used as a correction pin for correcting the winding of the tail end, it is not necessary to provide a separate correction pin. However, since the mandrel having a lower temperature than the wound coil keeps in contact with the inner diameter portion of the coil, the temperature of the inner diameter portion of the coil decreases, and the temperature of the inner diameter portion of the coil (the tail end of the rolled material) The temperature of the outer peripheral portion (tip of the rolled material) is greatly different. Then, in the finish rolling process, it is necessary to change the rolling conditions between the tip and the tail, and it may be difficult to perform rolling with a uniform thickness.

  On the other hand, in the transport roll system of Patent Documents 2 and 3, it is necessary to provide a separate correction pin, but like the mandrel system, a member having a low temperature continues to contact the inner diameter part of the coil from the initial stage of rewinding. Therefore, it is excellent in that the temperature of the coil is made uniform.

JP 2000-190023 A Japanese Patent Laid-Open No. 11-207407 Japanese Patent Laid-Open No. 10-323713

  However, when the transport systems disclosed in Patent Documents 2 and 3 are used, it becomes difficult to insert the correction pin into the coil inner diameter portion for the following reason.

  The correction pin is arranged at the rewind position corresponding to the place where the coil inner diameter portion is located, and is inserted into and removed from the coil inner diameter portion at the installation position. However, in the transport roll method of Patent Document 2, when the coil is rolled by the transport roll, the position of the coil is shifted due to inertial force, or the end of the coil is pulled by the finish rolling mill and the position of the coil is shifted. Therefore, it is difficult to position the inner diameter part of the coil at a position corresponding to the installation position of the correction pin.

  Further, in the coil box of Patent Document 3, the coil is brought into contact with the holdback roll provided at the rewinding position to perform rewinding. However, the holdback roll of Patent Document 3 receives an impact during coil rolling. It has a damper function for relaxing, and does not accurately position the coil relative to the rewind position. The coil in contact with the holdback roll vibrates around the rewind position by the elastic force from the holdback roll, and it is difficult to reliably insert the correction pin into the inner diameter portion of the coil.

  Thus, in the conventional coil box, it has been difficult to achieve both the uniformity of the coil temperature and the elimination of the warping of the coil tail end portion using the correction pin.

  The present invention has been made in view of such circumstances, and the coil temperature is made uniform by ensuring the insertion of the correction pin into the coil inner diameter portion at the coil rewinding position of the rolled material. An object of the present invention is to provide a coil box that achieves both the elimination of warpage at the tail end portion of the coil.

  In order to solve the above problems, the coil box of the present invention is arranged between a rough rolling mill and a finish rolling mill of a hot rolling facility, and winds a rolled material rolled by the rough rolling mill into a coil shape. A coil box that rewinds the coil of the rolled material while feeding it to a predetermined rewind position and supplies it to the finishing mill, and a detection device that detects the remaining winding amount of the rewinded coil; A positioning device that positions the coil at the rewinding position when the remaining winding amount detected by the detection device is below a predetermined design value; and an inner diameter portion of the coil that is positioned by the positioning device. And a straightening pin that is inserted and touches the coil to straighten the winding of the coil.

  According to this configuration, only when the remaining winding amount falls below a predetermined design value, the positioning device is activated to position the coil of the rolled material, and the corrective pin is reliably inserted into the coil inner diameter portion. It can be set as the coil box which performs. Therefore, by reducing the design value of the remaining winding amount, it becomes possible to shorten the time for the relatively cool straightening pin to touch the inner diameter part of the coil, and to make the coil temperature uniform and at the tail end part of the coil. It is possible to achieve both the elimination of warpage.

In the present invention, it is preferable that the detection device detects an outer diameter of the coil as the winding remaining amount.
According to this configuration, since the positioning device is uniformly operated by the outer diameter of the coil, the driving of the positioning device is constant regardless of the thickness of the rolled material wound in the coil shape, and the process can be easily controlled. .

  In the present invention, it is preferable that the detection device detects a remaining winding length of the coil as the remaining winding amount.

  Hot rolling equipment manufactures rolled material of various thicknesses. For this reason, when two types of rolled materials having different thicknesses are assumed, the lengths of the rolled material being wound are different even with the same coil outer diameter. Therefore, when the operation timing of the positioning device is controlled by the outer diameter of the coil, the remaining winding length of the coil when the correction pin is inserted differs depending on the thickness of the rolled material. The correction pin is touched for a relatively long time than the material.

  However, according to this configuration, since the positioning device is operated according to the remaining winding length of the coil, for example, only the rolled material having a slight length from the tail end is corrected regardless of the thickness of the rolled material. The pin can be controlled to touch, and it is possible to surely eliminate the warp while suppressing the temperature drop due to the correction pin.

  In the present invention, the positioning device may include a holdback roll provided so as to be movable in the flow direction of the rolled material, and a cylinder that pushes the coil upstream through the holdback roll. desirable.

  Since the rolled material that has been rewound is applied with a tensile force in the downstream direction by the rolling process in the downstream finish rolling process, the coil may escape in the downstream direction due to the tensile force. The holdback roll is in contact with the coil at the rewind position, thereby preventing such runaway and having a function of holding the coil at the rewind position.

  Here, according to the structure of this invention, the coil which contact | abuts a holdback roll will be pushed back upstream by pushing back a holdback roll with a cylinder. Therefore, for example, as compared with the case where positioning is performed by operating a roll installed on the floor side before the correction pin is inserted, reliable positioning is possible while preventing the coil from running away.

In the present invention, it has detection means for detecting the position of the coil, and the cylinder extends to a position where the inner diameter portion of the coil and the insertion position of the correction pin overlap based on the detection result of the detection means. It is desirable to do.
According to this configuration, the extension length of the cylinder can be appropriately controlled, and reliable positioning is possible.

  According to the present invention, it is possible to achieve both the uniformity of the coil temperature and the elimination of the warp at the tail end portion of the coil.

It is a schematic explanatory drawing which shows the coil box of this embodiment. It is explanatory drawing which shows the positioning device which the coil box of this embodiment has. It is a flowchart which shows operation | movement of the positioning device of this embodiment. It is explanatory drawing which shows operation | movement of the positioning device of this embodiment.

  Hereinafter, the coil box which concerns on embodiment of this invention is demonstrated, referring FIGS. 1-4. In the following description, first, the apparatus configuration of the coil box of the present invention will be described with reference to FIGS. 1 and 2, and then the operation of the coil box of the present invention will be described with reference to FIGS. In all the drawings below, the dimensions and ratios of the constituent elements are appropriately changed in order to make the drawings easy to see.

  FIG. 1 is a schematic explanatory view showing a coil box CB of the present embodiment. The coil box CB is disposed between the rough rolling mill and the finish rolling mill of the hot rolling facility. Usually, the hot rolling process is performed in units of rolling ingots (slabs) that are raw materials, and a rolled material is formed from each slab.

  In the coil box CB, the rolled material 75 flowing on the table roll 101 from the upstream side is sent to the bending roll 103 via the deflector roll 102 and is wound in a coil shape at the winding position CB1. At the winding position CB1, a cylindrical coil 70 is formed while being wound by the forming roll 104 and the cradle roll 105. During the formation of the coil 70, the pair of stabilizers 122 sandwich the coil 70 from both ends in the width direction of the rolled material 75 to adjust the coil shape.

  When the coil 70 corresponding to one slab is formed, the coil box CB starts to rewind the coil 70 at the winding position CB1 and then at the rewinding position CB2.

  First, at the winding position CB1, the cradle roll 105 rotates reversely while the tip of the peeler 120 provided on the frame 121 is applied to the winding end of the coil 70, and the rolled material 75 is extended.

  In the coil box CB, the coil 70 is rolled up to the rewinding position CB2 in cooperation with the cradle roll 105 and the kickout roll 106 moving up and down while rewinding the coil 70.

  At the rewinding position CB2, the coil 70 is rewound as the support roll 107 rotates while contacting the holdback roll 12 of the positioning device 1. The rolled material 75 that has been rewound flows on the table roll 108 and is sent to the downstream side while being sandwiched between a plurality of (three in the figure) pinch rolls 110 from above and below.

  In addition, the length of the rolled material 75 that has flowed can be measured by the measuring roll 109 that is disposed on the upstream side of the pinch roll 110.

  2A and 2B are explanatory views showing the positioning device 1, in which FIG. 2A is a cross-sectional view seen from the side, and FIG. 2B is a plan view.

  As shown in FIG. 2A, the positioning device 1 includes an arm 11 disposed on the upstream side of the positioning device 1, a holdback roll 12 connected to the lower end side of the arm 11, and a lower end side of the arm 11. And a hydraulic cylinder (cylinder) 10 extending in the downstream direction. The hydraulic cylinder 10 and the arm 11 are connected by a connecting member 14 and a connecting shaft 15.

  The holdback roll 12 has a function of preventing the coil 70 from escaping due to the tensile force in the finishing rolling process and keeping it at the rewinding position CB2 by contacting the coil 70 at the rewinding position CB2. Therefore, the holdback roll 12 has a plurality of grooves formed on the surface for the purpose of preventing the temperature of the coil 70 from decreasing from the contact portion as much as possible, and the contact area with the coil becomes small. ing.

  An attachment shaft 13 that connects the arm 11 to the frame of the positioning device 1 is provided at the upper end of the arm 11, and the position of the holdback roll 12 is changed by the arm 11 swinging about the attachment shaft 13. It is possible.

  In addition, as shown in FIG. 2B, one hydraulic cylinder 10 is provided at the center in the width direction of the positioning device 1, but a configuration including a plurality of hydraulic cylinders 10 is also possible.

  In the positioning device 1, one end of each of the two connecting cylinders 16 is connected to connecting portions 17 provided on both sides in the width direction of the main body, one each. The other end of the connecting cylinder 16 is connected to a base portion (not shown). When the rolled material 75 to be rolled is switched, the connecting cylinder 16 is expanded or contracted to raise and lower the entire positioning device 1 and perform an operation of sandwiching the rolled material 75 between the pinch rolls 110.

  Returning to FIG. 2A, the positioning device 1 includes a sensor (detection device) 20 that detects the outer diameter d of the coil 70, and a correction pin 30 that is inserted into the inner diameter portion 71 of the coil 70 to correct the winding of the coil 70. And a control device 50 for controlling the movement of the hydraulic cylinder 10 and the correction pin 30 based on the detection result obtained from the sensor 20 is connected.

  The control device 50 compares the detection result stored in the buffer 51 with the buffer 51 that temporarily stores the detection result of the sensor 20, the memory 52 that stores the set value of the outer diameter d, and the set value stored in the memory 52. The comparison calculation unit 53, the cylinder control unit 54 that transmits the drive signal of the hydraulic cylinder 10 according to the comparison process of the comparison calculation unit 53, and the correction that transmits the drive signal of the correction pin 30 according to the comparison process of the comparison calculation unit 53 A pin control unit 55 is provided.

  FIG. 3 is a flowchart mainly showing the operation of the positioning device 1 with respect to the operation of the coil box of the present embodiment. Below, operation | movement of the positioning device 1 is demonstrated, using the code | symbol shown in FIG. 2 as needed.

  First, in the positioning device 1, the outer diameter d is detected by the sensor 20 and temporarily stored in the buffer 51 (step S1). Detection by the sensor 20 is sequentially performed and stored in the buffer 51 sequentially.

  Next, the outer diameter d stored in the buffer 51 is compared with the set value stored in the memory 52 by the comparison calculation unit 53 (step S2). This comparison calculation process is continued until the outer diameter d falls below the set value.

  When the outer diameter d falls below the set value, the comparison calculation unit 53 transmits a signal to the cylinder control unit 54 and the correction pin control unit 55. The cylinder control unit 54 that has received the signal supplies a drive signal to the hydraulic cylinder 10. The hydraulic cylinder 10 is driven in response to the drive signal to expand to push back the coil 70 and position the coil 70 (step S3).

  Further, the correction pin control unit 55 supplies a drive signal to a correction pin driving device (not shown) so as to insert the correction pin 30 into the coil inner diameter portion 71. The correction pin driving device moves the correction pin 30 in accordance with the drive signal and inserts it into the coil inner diameter portion 71 (step S4).

  FIG. 4 is an explanatory diagram for explaining the operation of the positioning device 1 mainly in the rewinding operation with respect to the operation of the coil box of the present embodiment.

  First, as shown in FIG. 4A, the coil 70 formed at the winding position CB1 is opened using the peeler 120 at the time of rewinding, and then conveyed to the rewinding position CB2 while being rewound. The coil 70 is rewound while being in contact with the holdback roll 12 at the rewind position CB2.

  Next, as shown in FIG. 4B, when the rewinding proceeds, the coil 70 is gradually reduced in size, for example, from the coil 70a to the coil 70b. During this time, the outer diameter of the coil 70 is continuously measured by a sensor (not shown).

  When the outer diameter of the coil 70b falls below a predetermined set value, as shown in FIG. 4C, the hydraulic cylinder 10 is driven and the coil 70b contacting the holdback roll 12 is pushed back and positioned. Then, the correction pin 30 is inserted into the coil inner diameter portion 71 at the positioned position. Accordingly, the correction pin 30 comes into contact with the coil inner diameter portion 71 for the first time at this time.

  In the hot rolling process, since the rolled material 75 is heated to a high temperature, when the correction pin 30 contacts the coil 70 at the coil inner diameter portion 71, the temperature of the coil 70 decreases from the coil inner diameter portion 71. Then, the temperature of the tail end of the rolled material 75 is lower than that of the rolled material 75, and in the finish rolling process, it is necessary to change the rolling conditions according to the temperature. It may be difficult to do.

  However, in the coil box CB of the present embodiment, as described above, the correction pin 30 is inserted into the coil inner diameter portion 71 only when the outer diameter of the coil 70 falls below the set value. Therefore, by setting the set value small, the length of the rolled material 75 that can change the temperature by touching the straightening pin 30 can be managed to be short, so that the risk of quality change due to temperature change is minimized. Can do.

  Here, the inner diameter of the coil 70 is determined to be substantially constant regardless of the size of the slab, which is the original material, and the set thickness of the rolled material 75. Therefore, when the movement of the hydraulic cylinder 10 is managed by the outer diameter of the coil 70, the inner diameter of the coil is always increased by the extension of the hydraulic cylinder 10 by the same length regardless of the size of the slab and the set thickness of the rolled material 75. 71 can be pushed back to the position where the correction pin 30 can be inserted and positioned.

  In such a case, the amount of oil in the hydraulic cylinder 10 may be defined and set so that the coil inner diameter portion 71 overlaps the insertion position of the correction pin with a length that is completely extended, A position sensor (detection means) for detecting the position of the coil 70 may be provided separately, and control may be performed to stop the movement of the hydraulic cylinder 10 when the coil inner diameter portion 71 is pushed back to a predetermined position.

Then, as shown in FIG. 4 (d), the tail end 75a of the rolled material 75 is rewound along the correction pin 30, so that the rolled material 75 wound up in a coil shape is completely rewound, and downstream Can be sent to the finishing rolling process.
The positioning device 1 included in the coil box of the present embodiment has such a configuration and operation.

  According to the coil box CB having the above-described configuration, it is possible to shorten the time during which the correction pin 30 that is relatively cooler than the coil 70 is in contact with the coil inner diameter portion 71, uniformizing the temperature of the coil 70, and rolling It is possible to achieve both the elimination of warping at the tail end 75a of the material 75.

  In the present embodiment, the hydraulic cylinder 10 is driven when the outer diameter of the coil 70 falls below a predetermined set value. However, the control method is not limited to this.

  For example, even if the outer diameter of the coil 70 is the same, if the set thickness of the rolled material 75 is different, the winding remaining amount of the coil 70 is different. Therefore, even if the correction pin 30 is inserted when the outer diameter of the coil 70 is below the same set value, the coil 70 wound with the thin rolled material 75 has a relatively long winding remaining amount than the thick rolled material. The temperature of a rolling material will fall.

  Therefore, it is only necessary to detect not the outer diameter of the coil 70 but the remaining winding length of the coil 70 and change the driving timing of the cylinder 10 according to the thickness of the rolled material 75.

  The remaining winding length of the coil 70 is calculated by calculating the outer diameter of the coil 70 corresponding to the predetermined winding length from the thickness of the rolled material 75 and storing it in the memory 52 of the control device 50 as a table. It is also good. Alternatively, the length of the rolled material 75 that has flowed is detected using the measuring roller 109, and based on the length of the rolled material 75 calculated from the size of the raw material slab and the width and thickness of the rolled material 75. It may be calculated.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but it goes without saying that the present invention is not limited to such examples. Various shapes, combinations, and the like of the constituent members shown in the above-described examples are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Positioning device, 10 ... Hydraulic cylinder (cylinder), 12 ... Holdback roll, 20 ... Sensor (detection device), 30 ... Correction pin, 70 ... Coil, 71 ... Coil inner diameter part (inner diameter part), CB ... Coil box , D ... outer diameter,

Claims (5)

It is arranged between a rough rolling mill and a finish rolling mill of a hot rolling facility, the rolled material rolled by the rough rolling mill is wound into a coil shape, and the coil of the rolled material is conveyed to a predetermined unwinding position. A coil box that is rewound while being supplied to the finishing mill,
A detecting device for detecting the remaining winding amount of the coil that has been rewound;
A positioning device that positions the coil at the rewinding position when the remaining winding amount detected by the detection device falls below a predetermined design value;
A coil box, comprising: a correction pin that is inserted into an inner diameter portion of the coil positioned by the positioning device and corrects winding of the coil in contact with the coil.   The coil box according to claim 1, wherein the detection device detects an outer diameter of the coil as the winding remaining amount.   2. The coil box according to claim 1, wherein the detection device detects a remaining winding length of the coil as the winding remaining amount. The positioning device is a holdback roll provided movably in the flow direction of the rolled material,
The coil box according to any one of claims 1 to 3, further comprising a cylinder that pushes the coil back to the upstream side via the holdback roll. Having detection means for detecting the position of the coil;
5. The coil box according to claim 4, wherein the cylinder extends to a position where an inner diameter portion of the coil and an insertion position of the correction pin overlap based on a detection result of the detection means.

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