JP3584587B2 - Coil end face heating device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a coil end surface heating device for heating both end surfaces of a coil in a hot rolling facility.
[0002]
[Prior art]
In the hot rolling equipment for performing finish rolling after rough rolling, as schematically shown in FIG. 4 (A), rolling is performed to a bar having a thickness of 30 to 50 mm by a rough rolling mill, and then several mm thick by a finishing rolling mill. Roll to strip. In this case, there is a problem that it takes a long time from the completion of the rough rolling to the completion of the finish rolling, the temperature of the rear end of the bar becomes lower than that of the front end, and uniform finishing is difficult.
[0003]
Therefore, as schematically shown in FIG. 4B, a method has been disclosed in which a bar after rough rolling is wound into a coil shape and finish-rolled while unwinding the bar. According to this method, since the entire bar is prevented from being cooled and the finish rolling is performed from the rear end in the rough rolling, the temperature difference between the front and rear ends of the bar can be made substantially the same.
In addition, the front end when winding the bar after rough rolling into a coil shape becomes the rear end when rewinding the coil, and the rear end when winding the bar after rough rolling into the coil shape is used when rewinding the coil. Be the tip.
[0004]
However, even in this case, there is a problem that the coil ends are easily cooled as compared with the central portion in the width direction, so that it is difficult to equalize the temperature in the width direction. FIG. 5 illustrates a temperature change at the coil end when the coil is unwound in FIG. 4B. As shown in the figure, when rewinding the coil, the temperature drop is small because the front end side is finish-rolled immediately, but it takes a long time to finish roll at the rear end side. The temperature drop becomes large in comparison. On the other hand, when the bar after the rough rolling is wound into a coil shape, the temperature is greatly reduced on the tip side.
[0005]
In order to solve this problem, there have been proposed (1) a method of transferring the coil while keeping it warm by a heat shield panel, and (2) a method of heating the end face of the coil (Japanese Patent Application Laid-Open No. 7-51726). .
[0006]
[Problems to be solved by the invention]
However, when the bar after rough rolling is wound into a coil, the diameter of the coil gradually increases, and when the coil is rewound, the diameter of the coil gradually decreases. Therefore, in order to heat the entire coil end face, it is necessary to increase the size of the heating device, and when the diameter of the coil is small, energy loss is large and wasteful. In addition, if only the inner winding portion of the coil end face is to be heated, if the diameter of the coil is large, there are a heated portion and a non-heated portion, so that temperature unevenness is generated and uniformity is generated. Finish processing becomes difficult.
[0007]
The present invention has been made to solve the above problems. That is, an object of the present invention is to provide a coil end surface heating device capable of efficiently and uniformly heating a coil end surface.
[0008]
[Means for Solving the Problems]
According to the present invention, after the hot-rolled material is roughly rolled, it is wound into a coil without a core, and on a line for finish rolling while unwinding the coil, a coil end surface for heating the entire both end surfaces of the coil. A heating device, wherein a plurality of heaters are integrated, and a plurality of heating panels are arranged so as to be able to heat the entire coil end face, and heating for supporting the plurality of heating panels near the coil end face. And a panel supporting member, wherein a small-capacity heater is installed near the upper end of the heating panel supporting member, and a large-capacity heater is installed near the lower end of the heating panel supporting member. A feature is provided for a coil end surface heating device.
[0009]
According to the embodiment of the present invention, it is preferable that the heater uses one of combustion heating, resistance heating, induction heating, and radiant heating.
[0010]
In the present invention described above, the winding and rewinding of the coil, which is generally performed without a core, is performed on two parallel rolls. This is devised in view of the fact that when the coil is rewound for finish rolling, the diameter is reduced based on the lower surface. That is, by installing a small-capacity heater near the upper end of the heating panel support member and installing a large-capacity heater near the lower end, it is possible to heat the entire coil end surface, The inner winding side can always be heated by a large-capacity heater.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a preferred embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows only one side of the coil end surface.
[0012]
FIG. 1 is a cross-sectional view of a coil end surface heating device of the present invention, and FIG. 2 is a front view of the coil end surface heating device of the present invention. In the coil end surface heating device 3 shown in these figures, burners 4s and 4b are used as heaters. The coil end surface heating device 3 includes a heating panel 5 in which a plurality of burners 4s and 4b are integrated, and a heating panel support member 6 for supporting a plurality of the heating panels 5 near the coil end surface 2. The burner of the heating panel 5 supported on the upper end of the panel support member 6 and a part of the burner of the heating panel 5 supported on the second stage from the top of the heating panel support member 6 are small-volume burners 4s, The other burners (that is, the lower end side of the heating panel support member 6) are the large-capacity burners 4b.
[0013]
The coil 1 is supported by a bending roll or a guide roll (not shown), and is wound or unwound without a core. The coil end surface heating device 3 of the present invention uses the coil 1 to wind or wind. Used when returned.
[0014]
The capacity of each of the burners 4s and 4b and the arrangement and distribution of the small-capacity burners 4s and the large-capacity burners 4b are determined by conditions such as the size of the coil 1, the number of burners installed in the coil end surface heating device 3, and the heating temperature. Depends on In the coil end surface heating device 3 of the present invention, it is sufficient that large to small heat energy is applied to the coil end surface 2 from the lower end side to the upper end side, and the small-capacity burner 4s and the large-capacity burner 4b are provided. Alternatively, a burner of an intermediate capacity may be installed.
[0015]
The heating panel 5 is a refractory, for example, a castable refractory so that the burners 4s and 4b can be fitted therein. The heating panel 5 is provided with a header 7 for supplying fuel to each of the burners 4s and 4b. When the coil 1 is wound or rewound, the burner 4s and 4b burn through the header 7 via the header 7. Gas is sent in and ignited.
[0016]
The heating panel support member 6 is connected to a position adjusting device (not shown), and supports the heating panel 5 having a plurality of burners 4s and 4b near the coil end surface 2.
[0017]
As the heater, in addition to combustion heating of the burners 4s, 4b, etc., resistance heating using a metal such as Ni-Cr, induction heating in which an induced current is generated in the coil 1 for heating, Cr, Al, etc. The heat-generating surface is composed of a porous material obtained by sintering the heat-resistant alloy fiber of the above into a mat shape, and a combustible pre-mixed gas is sent to the heat-generating surface to ignite, thereby raising the temperature of the heat-generating surface in a short time. Radiation heating, which heats the coil end face with the radiation heat, can also be used.
[0018]
In addition, as shown by a dashed line in FIG. 2, when the bar after the rough rolling is wound into a coil, the diameter is increased from a small diameter state to a large diameter state based on the lower surface, and the finish rolling is performed. When the coil 1 is rewound to reduce the diameter, the diameter of the coil 1 is reduced from a large diameter state to a small diameter state based on the lower surface thereof. Therefore, according to the above-described coil end surface heating device 3 of the present invention, even if the coil 1 has a large diameter, the entire coil end surface can be heated, so that the coil end surface can be uniformly heated. Further, even if the coil 1 has a small diameter, energy loss can be suppressed, and the inner winding side of the coil 1 that has been staying for a long time can be mainly heated.
[0019]
FIG. 3 is a front view showing another embodiment of the coil end surface heating device of the present invention. The coil end surface heating device 3 shown in the figure is obtained by cutting out a part of the heating panel support member 6. In the figure, the heating panel support member 6 is formed in a U-shape by cutting out a portion extending from the lower end to the center. By providing the notch in the heating panel support member 6 in this way, the mandrel 8 can be inserted into the center of the coil 1 without moving the coil end surface heating device 3 when the coil 1 is moved.
[0020]
Since the coil end surface heating device 3 of the present invention is devised in view of the coil 1 expanding and contracting in diameter, a small-capacity burner 4s is provided not only near the upper end but also on both sides. It may be.
[0021]
It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the spirit of the present invention.
[0022]
【The invention's effect】
According to the coil end surface heating device of the present invention described above, a small-capacity heater is installed near the upper end of the heating panel support member, and a large-capacity heater is installed near the lower end. Heating can be performed in accordance with the change in the coil diameter due to the return. That is, (1) even if the coil has a large diameter, the entire coil end face can be heated, so that the coil end face can be made uniform. (2) Energy loss when the coil has a small diameter can be suppressed. {Circle around (3)} The inner winding side of the coil remaining for a long time can be mainly heated.
[0023]
Therefore, the coil end face can be efficiently and uniformly heated, heat radiation from the coil end face can be suppressed, the temperature in the coil width direction can be made uniform, and uniform finishing can be performed. Has excellent effects.
[Brief description of the drawings]
FIG. 1 is a sectional view of a coil end surface heating device of the present invention.
FIG. 2 is a front view of the coil end surface heating device of the present invention.
FIG. 3 is a front view showing another embodiment of the coil end surface heating device of the present invention.
FIG. 4 is a diagram schematically showing a hot rolling facility that performs finish rolling after rough rolling.
FIG. 5 is a diagram showing a temperature change at a coil end when the coil is unwound in FIG. 4 (B).
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Coil 2 Coil end face 3 Coil end face heating device 4 s Small capacity burner (heater)
4b Large capacity burner (heater)
5 Heating panel 6 Heating panel support member 7 Header 8 Mandrel

Claims (2)

After rough rolling of the hot-rolled material, it is wound into a coil without a core, and on a line for finish rolling while unwinding the coil, a coil end surface heating device for heating the entire end surfaces of the coil,
A plurality of heating panels that are integrated such that a plurality of heaters are arranged and can heat the entire coil end face, and a heating panel supporting member that supports the plurality of heating panels near the coil end face, Become
A coil end surface heating device, wherein a small-capacity heater is installed near the upper end of the heating panel support member, and a large-capacity heater is installed near the lower end of the heating panel support member. The coil end surface heating device according to claim 1, wherein the heater uses one of combustion heating, resistance heating, induction heating, and radiation heating.

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