JPH04274813A - Method and device for coiling and decoiling for hot rolling - Google Patents

Abstract

PURPOSE:To prevent the generation of flaw on the surface of a plate caused by an interlayer strip at the time of winding out a bar material without allowing heat of a wound coil to escape, in the method and the device for coiling and decoiling for hot rolling for executing heat insulation of the bar material between a rough rolling mill and a finish rolling mill. CONSTITUTION:In a coiling position, a spool 5 is prepared in advance, a coil 4 is coiled up by winding a bar material round its spool, its coil 4 is transferred to a coiling-out position together with the spool 5, the coil 4 is coiled out in the coiling-out position, and thereafter, the left spool 5 is discharged from the coiling-out position, and its discharged spool is heated, and thereafter, fed into the coiling position and used circulatingly.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to hot rolling equipment for steel plates, and in particular, the present invention relates to hot rolling equipment for steel plates, and in particular, the bar material is rolled up and kept warm between a rough rolling mill and a finishing mill before being sent to the finishing mill. The present invention relates to a coiling and decoiling method and apparatus for hot rolling that prevents the temperature of a material from decreasing.

0002

[Prior art] In hot rolling, a rough rolling mill is used to
A slab of approximately 0 mm is rolled into a bar material of approximately 30 to 40 mm, and then rolled to a bar material of approximately 30 to 40 mm using a finishing mill with 6 to 7 stands.
Finish ~40mm bar material into 1~6mm strips. The rolling speed is 150 to 250 m/min on the exit side of the rough rolling mill, but the rolling speed is as low as 30 to 60 m/min depending on the final finished plate thickness and speed on the inlet side of the finishing rolling mill. Between the rough rolling mill and the finishing mill, (1) a decrease in the temperature of the bar material, (2) an increase in the temperature difference between the front and rear ends of the bar material, and (3) the occurrence of secondary scale is unavoidable. Not only does this make it difficult, but it also significantly reduces the quality of the board. For this reason, in the past, a mandrel-less down coiler, so-called coil box, was installed between the rough rolling mill and the finishing mill to coil the bar material, thereby retaining heat, inverting the leading and trailing ends of the bar material, and preventing secondary scale. (Tokuko 53)
(Refer to Publication No.-16380). In addition, a method has been proposed in which the winding and unwinding positions are provided at two separate locations so that winding and unwinding can be performed at the same time (Japanese Patent Publication No. 52-45
(See Publication No. 304).

0003

[Problems to be Solved by the Invention] The above-described coil box for winding and unwinding bar material between a rough rolling mill and a finishing mill for the purpose of heat retention, that is, a coiling and decoiling device, has already been used in an actual line. ing. However, these conventional techniques have the following problems.

(1) In the method of winding bar material using a mandrel-less coiler, it is not possible to tightly wind up the bar material, so strips between the layers of the plate are generated during winding and unwinding, and the scale interposed between the layers causes strips. There is a problem of scratching the board surface.

(2) Furthermore, in the method of winding the bar material around a mandrel, heat escapes through the mandrel and the inside of the coil is cooled. Therefore, in order to sufficiently achieve the purpose of heat retention, a mandrel-less coiler must be used.

[0006] The first object of the present invention is to provide a hot rolling method for keeping the bar material warm between a rough rolling mill and a finishing rolling mill without causing scratches on the plate surface due to interlayer strips during winding and unwinding of the bar material. An object of the present invention is to provide a rolling coiling and decoiling method and apparatus.

[0007] A second object of the present invention is to provide a coiling and decoiling method and apparatus for hot rolling that achieves the first object without escaping the heat of the wound coil.

[0008]

[Means for Solving the Problems] In order to achieve the first object, the present invention provides a heat-insulating method for rolling up and keeping the bar material between a rough rolling mill and a finishing mill before sending it to the finishing mill. In the inter-rolling coiling and decoiling method, a bar material is wound around a spool prepared in advance at a winding position to wind up a coil, the coil is transferred together with the spool to an unwinding position, and the coil is unwound at the unwinding position. After that, the remaining spool is discharged from the unwinding position, and the discharged spool is fed into the winding position and used for circulation.

[0009] In order to achieve the second object, the present invention also provides the above hot rolling coiling and decoiling method, in which the spool is transferred from the unwinding position to the winding position. It is heated.

In order to achieve the first object, the present invention is arranged between a rough rolling mill and a finishing mill, and the rough rolled bar material is once rolled up before being sent to the finishing mill. A coiling and decoiling device for hot rolling that retains heat includes: a spool prepared in advance at a winding position; a winding means for winding a bar material around the spool at the winding position and winding it into a coil; a transfer means for transporting the wound coil along with the spool from a winding position to an unwinding position; an unwinding means for unwinding the coil transferred to the unwinding position; and after unwinding the coil at the unwinding position. The apparatus includes a spool circulation means for discharging the remaining spool from the unwinding position and feeding the discharged spool to the winding position.

In order to achieve the second object, the present invention provides the above-described coiling and decoiling apparatus for hot rolling, in which the spool circulating means unwinds the spool from the unwinding position to the winding position. It is provided with means for heating during transfer.

Preferably, the winding means is an up-coiler, and the cylindrical surface of the central part of the spool around which the bar material is wound is provided with the largest part of the bar material so that the tip of the bar material can be bent toward the center of the spool. An axial notch wider than the plate width is formed. Preferably, the winding means includes a snubber roll that presses the tip or abdomen of the bar material against the spool so that the bar material is tightly wound onto the spool. Preferably, the transport means also includes:
This is a coil transfer crane that hooks both ends of the spool and lifts the coil. Preferably, before the coil wound at the winding position is transferred to the unwinding position, a coil support supports both ends of the spool between the winding position and the unwinding position and holds the coil in a standby position. The configuration further includes:

[0013]

[Function] It is very difficult to prevent the generation of secondary scale in coiling and decoiling equipment for hot rolling that keeps the bar material warm between the rough rolling mill and the finishing mill. prevention. For this reason,
A spool is prepared in advance at a winding position, a bar material is tightly wound around this spool, and tight coiling is performed using the spool as a core. At this time, the spool prepared at the winding position holds the inner diameter of the coil by tightly wrapping the bar material, and serves to prevent interlayer slippage of the bar material during winding and unwinding. Further, by providing a snubber roll at the winding position and pressing the tip or abdomen of the bar material against the spool, the bar material is tightly wound by the spool. Therefore, even if scale is present between the layers, scratches are prevented from occurring on the plate surface.

On the other hand, when the bar material is wound around the spool in this way, the heat of the coil escapes through the spool, similar to the coiler having a mandrel mentioned in the problem (2) above. Therefore, the second objective cannot be achieved simply by using the spool in circulation. Therefore, after the spool has been unwound from the bar material, the spool is heated with a heater between the time it is unwound from the unwinding position and the time before it is used at the winding position, so that the heat escapes from the coil. prevent. By using several spools and using them while circulating them in sequence, it can be used to wind up bar material that is being rolled one after another without lowering the temperature.

By forming an axial notch on the cylindrical surface of the spool, the tip of the bar material at the beginning of winding can be folded into the inside of the spool, and the step on the coil surface caused by the tip when winding the bar material is eliminated. It becomes less.

[0016] By arranging a coil support between the winding position and the unwinding position to create a three-position system of the winding position, unwinding position, and standby position, the unwinding of the coil from the unwinding position is completed. Immediately, the coil can be moved from the standby position to the unwinding position while unwinding the next coil, which speeds up the unwinding timing of the next coil following the previous coil, and enables rolling without time loss.

[0017]

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 14. In FIGS. 1 and 2, reference numeral 1 indicates an exit table roller of a rough rolling mill (not shown). The roughly rolled bar material having a thickness of 20 to 40 mm is guided on these rollers 1 to the coiling and decoiling apparatus according to this embodiment. The bar material is first given a large bending curvature by a three-roll bending roll 2 at a winding position, and is wound onto a motor-driven up roller, ie, a cradle roller 3, to form a coil 4. At this time,
A spool 5 is prepared in advance on the cradle roller 3,
The bar material is wound around the spool 5. Further, a snubber roll 6 is provided adjacent to the cradle roller 3 for tightly pressing the bar material against the spool 5, and the bar material is wound while being pressed against the spool 5 by the snubber roll 5. By winding up the bar material using such a snubber roll 5, no gaps are created between the bar materials, and interlayer slips are less likely to occur during winding and unwinding.

The wound coil 4 is transferred to a transfer crane 7
is moved from the winding position to the unwinding position. A hook 7a is provided at the tip of the crane 7, and both ends of the spool 5 are caught by the hook 7a, and lifted by the cylinder 8. Further, wheels 9 are attached to the spool 7, and the spool 7 is movable on a rail 10 in the direction of the unwinding position by means of a cylinder 11. In particular, the hook 7a and the cylinder 9 are connected via a turning device 12, by means of which the direction of the coil 4 can be reversed in the horizontal plane during transfer to the unwinding position.

As shown in FIG. 2, the coil 4 brought to the unwinding position is placed on a motor-driven cradle roller 15. In some cases, the coil 4 is held at both ends of the spool 5 by coil supports 13. This is to prevent heat from the coil 4 from escaping via the cradle roller 15 when the coil 4 has to stand by on the cradle roller 15 for a long time due to rolling timing. When unwinding, the coil support 13 is lowered and the coil 4 is placed on the cradle roller 1.
Place it on top of 5. A bar material tip pulling device 16 is arranged adjacent to the cradle roller 15. Output device 16
is pressed against the coil surface, the coil 4 is rotated by the cradle roller 15, the tip of the bar material is separated from the coil surface, the tip of the bar material is exposed by bending it back to the position of the table roll 17, and the cradle Unwinding is performed by rotation of the roller 15.

The entire winding position and unwinding position are covered with a heat insulating cover 18 to prevent the temperature of the coil 4 from decreasing. When all the bar material is unwound at the unwinding position, the spool 5, which was the core of the coil 4, remains on the cradle roller 15. The spool 5 is taken out from the unwinding position by a spool circulating device, heated, and then sent to the winding position for circulation. The spool circulation device will be described later.

Next, details of the procedure for coiling and decoiling the bar material are shown in FIGS. 3 to 7. In each figure, the position of the cradle roller 3 on the left side is the winding position, and the position of the cradle roller 15 on the right side is the unwinding position. FIG. 3 shows the winding of the tip of the bar material around the spool 5 and the opening of the tip of the bar material. Figure 4 shows the coil 4 being wound up, and the cradle roller 15 showing only the spool 5 after unwinding.
Shows what remains on top. This spool 5 is unwound from the unwinding position by a transfer beam 19 (see FIG. 8) of a spool circulating device. 5 and 6 show how the coil 4 wound up at the winding position is moved by the crane 7 to the unwinding position. During this time, the direction of the coil 4 is reversed by 180 degrees in a horizontal plane by a turning device 12 provided on the crane 7, so that the tail end of the coil during winding becomes the tip of the coil when unwinding. FIG. 7 shows a state in which a new spool 5 is prepared at the winding position, and the transferred coil 4 is held by the coil support 13 at the unwinding position and is waiting at the unwinding position.

Next, the spool circulation device will be explained with reference to FIGS. 8 to 11. When the bar material is completely unwound at the unwinding position, the spool 5, which was the core of the coil, remains on the cradle roller 15. This spool 5 is delivered out of the heat retaining cover 18 from the unwinding position by the unwinding position transfer beam 19 of the spool circulating device shown in FIG. The transfer beam 19 has a pedestal 19A having a V-shaped cross section on which the spool 5 is placed at its tip, and has a rod portion supported by a plurality of beam support rollers 20, and drives a cylinder 21 to convey the spool 5.

The beam support roller 20 is a frame 3 that can be raised and lowered along guides 35 and 36 as shown in FIG.
7, 38, and the frames 37, 38 are attached to the fulcrum 3.
It is connected to a beam raising/lowering toggle mechanism 40 driven by a cylinder 39 pivotally supported at 9A. By driving the cylinder 39, the toggle mechanism 40
The support roller 20 is raised and lowered by the action of , and the transfer beam 19 is also raised and lowered accordingly. Due to this lifting and lowering and the forward and backward movement by the cylinder 21, the transfer beam 1
9 to move the pedestal 19A below the spool 5,
It becomes possible to move the pedestal 19A upward and place the spool 5 thereon, and to move the transfer beam 19 backward to unwind the spool 5 from the unwinding position. Further, a roller 41 and a long hole 42 are provided at the connecting portion between the transfer beam 19 and the cylinder 21 to allow the transfer beam 19 to move up and down, and the roller 41 is attached to an upper convex portion (not shown) at the end of the beam 19. The elongated hole 42 is formed in a gate-shaped member provided at the end of the rod of the cylinder 21 and into which the upper convex portion thereof enters. Further, a support roll 43 for preventing the beam from floating is provided at the upper part of the rod end, and the support roll 43 is guided and supported by a guide roller 44 to prevent the beam 19 from floating when the transfer beam 19 moves back and forth. It has become.

Spool 5 taken out from the winding position
is a pair of spool holders 23 of the spool heating device 22
moved above. This spool holder 23 serves as a lamp, and the spool 5 is fed into the heating device 22 while rotating one after another. Here, as shown in FIG. 10, an end 23A of the pedestal 23 on the rolling line side can be bent downward, and this end 23A is connected to the transfer beam 1.
In order not to interfere with the transfer of the spool 5 by the transfer beam 19, the cylinder 45 retracts to the bending position when the transfer beam 19 retreats, and after the spool 5 passes the end 23A,
It is extended to the extended position shown.

On the other hand, the heating device 22 has a cover 22A as shown in FIG. 10, and the spool holder 23 has a cover 22A.
It extends from the entrance, through its interior, and through the exit to the other side. A cylinder 46 is installed at the entrance of the cover 22A.
A door 47 that can be raised and lowered is provided, and a similar door structure is also provided at the exit. A temperature increasing heater 48 is provided inside the cover 22A, as shown in FIG. 11. As the heater 48, a gas combustion type burner, electric heating, induction heating, or other means can be used. The spool fed into the cover 22A by the spool holder 23 is heated by the heater 48 to preferably 1000°C or higher, more preferably about 1000 to 1200°C.

Further, a spool feeding device equipped with a pedestal 24 having a V-shaped cross section is provided inside the cover 22.
By tilting the spool 4 with a cylinder (not shown), the spools 5 inside the cover 22 are sent out one by one to the exit side portion of the pedestal 23. Here, the pedestal part on the exit side is configured in the same manner as the pedestal part on the input side, and the rolling line side can be bent downward. Further, a stopper 23B is provided at the tip of the pedestal portion on the exit side.

A winding position transfer beam 25 is provided on the exit side of the heating device 22. The winding position transfer beam 25 is constructed similarly to the unwinding position transfer beam 19. The spool 5 sent out to the exit side of the pedestal 23 is placed on the pedestal at the tip of the winding position transfer beam 25, and the spool 5 heated by the heating device 22 is transferred again onto the cradle roll 3 at the winding position. It is used for winding up bar material. In this way, the spool 5 is heated while being circulated, and is maintained at a required temperature for use.

8 to 11 show how to unwind the spool from the unwinding position and transfer the spool to the winding position.
A porter car or suspension beam may be used instead of the transfer beam shown in the figure.

The spool 5 may have a simple cylindrical shape, but preferably has a shape in which a notch 5a is provided in the axial direction on the cylindrical surface of the spool body, as shown in FIG. An example of the cross-sectional shape of this notch 5a is shown in FIG. 13(a). The width of this notch 5a is wider than the maximum plate width of the bar material. By providing the notch 5a in this way, the winding start end of the bar material can be folded into the inside of the spool 5, as shown in FIG. It is possible to make the level difference on the surface gentle. The axial notch is shown in Figure 1.
4 may have a cross-sectional shape having a slit 5b, and in this case as well, the tip of the bar material can be wound up with fewer steps on the coil surface.

Another embodiment of the present invention is shown in FIG. In this embodiment, after the previous coil has finished unwinding, the next coil can be unwound as quickly as possible.
An unwinding standby position is provided between the winding position and the unwinding position. When there are few remaining coils at the unwinding position, the coil support 13 at the unwinding standby position is lowered and the coil 4 is placed on the cradle roller 27. Preparation for unwinding is made by the unwinding device 16 at the tip of the bar material, and unwinding is started at the same time as the coil at the unwinding position is exhausted and the spool 5 is unwound. The unwinding device 16 is movable up and down or back and forth, and the cradle roller 27 is mounted on the coil car 26, so that the coil can be transferred from the unwinding standby position to the unwinding position while unwinding the coil. . The coil car 26 is the wheel 2
8, and can reciprocate between a standby position and an unwinding position on the rail 30 by means of a cylinder 31. Cradle roller 27
The width of the support frame is set smaller than the width of the support frame of the cradle roller 15 at the unwinding position, and when the cradle roller 27 moves to the unwinding position, it enters into the support frame of the cradle roller 15. In addition, in order to transfer the coil 4 to the cradle roller 15 in this state, the coil car 26 is equipped with a lifting cylinder 2.
9 is provided.

With the above configuration, as soon as the unwinding of the coil from the unwinding position is completed, the coil can be moved from the standby position to the unwinding position while unwinding the next coil, and the next coil following the previous coil can be moved to the unwinding position. By speeding up the unwinding timing, rolling can be performed with less time loss.

[0032]

According to the present invention, it is possible to eliminate scratches on the plate surface due to interlayer scale caused by interlayer slip during winding and unwinding of the bar material, and to obtain good product quality. Furthermore, since the inside of the coil is not cooled, heat from the wound coil is prevented from escaping from the inside. This makes it possible to apply the coiling and decoiling equipment for hot rolling even to materials that are prone to scale or materials with severe surface quality, making it easier to adjust production schedules, and making it easier to process slabs in heating furnaces. By lowering the heating temperature, it is also possible to save energy. Furthermore, by installing this device, the length of the equipment can be shortened.

[Brief explanation of the drawing]

FIG. 1 is a front view of a coiling and decoiling device for hot rolling according to an embodiment of the present invention.

2 is a front view showing different operating states of the hot rolling coiling and decoiling device shown in FIG. 1; FIG.

FIG. 3 is a diagram showing details of the operation procedure of winding, winding, and unwinding of the coiling and decoiling device for hot rolling shown in FIG. 1;

FIG. 4 is a diagram similar to FIG. 3, but showing details of a different operating procedure;

FIG. 5 is a diagram similar to FIGS. 3 and 4, but showing details of a different operating procedure;

FIG. 6 is a diagram similar to FIGS. 3 to 5, but showing details of a different operating procedure;

FIG. 7 is a diagram similar to FIGS. 3 to 6, but showing details of a different operating procedure;

8 is a plan view of a coil circulation device used in the hot rolling coiling and decoiling device shown in FIG. 1. FIG.

9 is a side view of the coil circulation device shown in FIG. 8. FIG.

10 is a perspective view of the inlet side of the heating device in the coil circulation device shown in FIG. 8. FIG.

11 is a sectional view of a heating device in the coil circulation device shown in FIG. 8. FIG.

12 is a perspective view of a spool used in the hot rolling coiling and decoiling device shown in FIG. 1. FIG.

13 is a cross-sectional view of the spool shown in FIG. 12, (a
) shows the state in which the bar material is not wound, and (b) shows the state in which the bar material is wound.

FIG. 14 is a sectional view of another shape of the spool shown in FIG. 12;

FIG. 15 is a front view of a coiling and decoiling device for hot rolling according to another embodiment of the present invention.

[Explanation of symbols]

3 Cradle roller (winding means) 4 Coil 5 Spool 6 Snubber roll 7 Coil transfer crane (transfer means) 13 Coil support 15 Cradle roller (unwinding means) 19, 25
Transfer beam (spool circulation means) 22 Heating device

Claims (9)

[Claims] [Claim 1] In a coiling and decoiling method for hot rolling in which a bar material is once rolled up and kept warm between a rough rolling mill and a finishing mill before being sent to a finishing mill, a bar material prepared in advance at a winding position is provided. Wrap the bar material around the spool to wind up the coil, move the coil together with the spool to the unwinding position, and after unwinding the coil at the unwinding position,
A coiling and decoiling method for hot rolling, characterized in that the remaining spool is taken out from an unwinding position, and the taken out spool is sent to the winding position for circulation use. 2. The coiling and decoiling method for hot rolling according to claim 1, wherein the spool discharged from the unwinding position is heated while being transferred to the winding position. coiling and decoiling methods. 3. A coiling and decoiling device for hot rolling, which is disposed between a rough rolling mill and a finishing mill, and which coils up and keeps the rough rolled bar material warm before sending it to the finishing mill. a spool prepared in advance at a take-up position; a take-up means for winding a bar material around the spool at the take-up position to wind it into a coil; a transfer means for transporting the coil to the unwinding position; an unwinding means for unwinding the coil transferred to the unwinding position; and an unwinding means for unwinding the spool left after unwinding the coil at the unwinding position, and unwinding the spool from the unwinding position. A coiling and decoiling device for hot rolling, comprising: spool circulation means for feeding the discharged spool to the winding position. 4. The coiling and decoiling apparatus for hot rolling according to claim 3, wherein the spool circulating means includes means for heating the spool discharged from the unwinding position while transferring the spool to the winding position. A coiling and decoiling device for hot rolling, characterized by: 5. The coiling and decoiling device for hot rolling according to claim 3, wherein the winding means is an up-coiler. 6. The coiling and decoiling device for hot rolling according to claim 3, wherein the spool has a central cylindrical surface around which the bar material is wound so that the tip of the bar material can be bent toward the center of the spool. A coiling and decoiling device for hot rolling, characterized in that it has an axial notch wider than the maximum width of a bar material formed in the bar material. 7. The coiling and decoiling device for hot rolling according to claim 3, wherein the winding means comprises:
1. A coiling and decoiling device for hot rolling, comprising a snubber roll that presses the tip or abdomen of the bar material against the spool so that the bar material is tightly wound onto the spool. 8. The coiling and decoiling apparatus for hot rolling according to claim 3, wherein the transfer means is a coil transfer crane that hooks both ends of the spool and lifts the coil. Coiling and decoiling equipment for use. 9. In the hot rolling coiling and decoiling device according to claim 3, before transferring the coil wound at the winding position to the unwinding position,
A coiling and decoiling device for hot rolling, further comprising a coil support that supports both ends of the spool between a winding position and an unwinding position and holds the coil in a standby position.