JP3788542B2 - Coil heating device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heating device that heats an inner surface and end surfaces of a coil in a hot rolling facility.
[0002]
[Prior art]
In a hot rolling facility that performs finish rolling after rough rolling, the rolling is performed to a bar having a thickness of 30 to 50 mm by a rough rolling mill, and then further rolled to a strip having a thickness of several mm by a finishing mill. In this case, since the time until the finish rolling is completed after completion of the rough rolling is long, the rear end of the bar has a lower temperature than the front end, which makes it difficult to perform uniform finishing.
[0003]
Therefore, as schematically shown in FIG. 7, a method has been proposed in which the bar after rough rolling is wound into a coil shape, and finish rolling is performed while the bar is rewound (Japanese Patent Publication No. 51-26317). By this method, the entire bar is prevented from being cooled, and finish rolling is performed from the rear end in rough rolling, so that the temperature difference between the front and rear ends of the bar can be made substantially the same.
[0004]
However, even in this case, compared with the central portion in the width direction, the coil end portion is easily cooled, and thus there is a problem that it is difficult to equalize the temperature in the width direction. Therefore, in order to solve this problem, (1) a method of heating the end face of the coil (Japanese Patent Laid-Open No. 7-51726), and (2) an apparatus for heating the inner surface of the coil and the outer surface of the mandrel with the flame of the applicant Hei 8-86126, unpublished) has been proposed.
[0005]
FIG. 8 is a schematic diagram showing a coil heating device proposed in Japanese Patent Application Laid-Open No. 7-51726, in which both end surfaces of the coil 1 are heated by a heating device 3 having a plurality of LPG burners. The heating device 3 can be moved to an optimum distance according to the coil width by the position adjusting device 4. In this figure, 2 is a cradle roll.
[0006]
FIG. 9 is a schematic view showing an apparatus for heating the inner surface of a coil proposed in Japanese Patent Application No. 8-86126. As shown in this figure, both end surfaces of the coil 1 are heated by a heating device 3 having a plurality of LPG burners, and the coil inner surface of the coil 1 is further inserted into a coil inner surface burner 6 inserted from a notch 5 of the heating device 3. Heated by the flame 6a, the outer surface of the mandrel 8 is heated by the flame 7a of the mandrel burner 7 inserted from both ends of the coil 1. The heating device 3 can be moved to an optimum distance according to the coil width by a position adjusting device (not shown).
[0007]
[Problems to be solved by the invention]
By using the coil end face heating device described in Japanese Patent Application Laid-Open No. 7-51726 (FIG. 8) described above, it is possible to prevent a temperature drop at the coil end and to make the temperature distribution in the width direction of the steel sheet substantially uniform. However, even with such a coil end face heating device, it is not possible to heat the inner surface of the coil with the greatest heat dissipation, so that the temperature of the inner face of the coil decreases extremely, the composition of the bar tail end changes, and the rolling load is reduced. There was a problem of increasing.
[0008]
On the other hand, the coil inner surface burner attached to the coil end face heating device of Japanese Patent Application No. 8-86126 (FIG. 9) is heated with a flame spreading in the width direction along the coil inner surface, and the mandrel burner is applied to the mandrel outer surface. The mandrel itself can be heated by a flame spreading in the width direction along the coil, and the inner surface of the coil can be heated by the radiant heat. When the optimum temperature range of the coil is, for example, 1000 to 1200 ° C., local heating of the inner surface of the coil can be prevented by increasing the temperature of the mandrel further and heating the inner surface of the coil mainly by radiant heat. However, at the beginning of use of the mandrel, the mandrel in a low temperature state is inserted into the coil, so heat is generated from the coil inner surface to the mandrel side, and the temperature on the inner surface of the coil is extremely lowered, which affects the subsequent finishing. There was a point. Further, as shown in FIG. 10 which is an AA arrow view of FIG. 9, when the outer periphery of the coil 1 to be wound becomes small, the mandrel 8 is lowered while swinging from a position a → b → c, for example. Although the burners 6 and 7 need only be able to move along the trajectory of the inner surface of the coil as the mandrel 8 moves, there is a problem in that there is a limit to the mounting. In FIG. 10, the heating device 3 can be moved to an optimum distance according to the coil width by a position adjusting device (not shown). In this figure, 2 is a cradle roll and 9 is a support roll.
[0009]
The present invention has been developed to solve the above-described problems. That is, an object of the present invention is to provide a coil heating apparatus that can rapidly heat an inner surface of a coil without lowering the temperature by removing heat and can also heat an end surface of the coil with a heating gas used for the heating.
[0010]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided a coil heating device for a rewinding / rewinding device that winds and rewinds a hot-rolled material into a coil, comprising a pair of mandrel insertion devices arranged opposite to each other, and the mandrel insertion device Includes a hollow mandrel inserted into the hollow hole of the coil, a high-temperature gas supply device that supplies a high-temperature gas into the mandrel, and a high-temperature gas guide plate that is disposed to face the coil end surface and forms a high-temperature gas path. The mandrel has a through hole for high temperature gas injection on the outer periphery thereof, and heats the inner surface of the coil wound with the high temperature gas injected from the through hole for high temperature gas injection and The coil end face is heated through the path.
[0011]
Prior to inserting the mandrel into the hollow hole of the coil, hot gas is supplied from the hot gas supply device into the mandrel and preheated to the temperature of the inner surface of the coil, and then the mandrel is inserted into the hollow hole of the coil from both sides and heated. The hot gas supplied to the inside of the mandrel is blown out from the many through holes provided in the outer periphery of the mandrel to the inner surface of the coil to heat the inner surface of the coil, and then into the hot gas path constituted by the hot gas guide plate and the coil end surface. Enter and heat the coil end face. Thereby, the temperature fall of the hollow hole inner surface and end surface of a coil can be prevented, and a coil can be kept at uniform temperature.
[0012]
According to a second aspect of the present invention, the hot gas guide plate is provided with rectifying plates arranged radially in the hot gas path with the mandrel side as the center.
[0013]
The hot gas that has heated the inner surface of the coil enters the hot gas path composed of the coil end face and the hot gas guide plate. The rectifying plate provided radially in the hot gas path has a center on the mandrel side. The flow is uniform along the end face. Thereby, a coil end surface can be heated uniformly.
[0014]
In invention of Claim 3, it is a coil heating apparatus for the rewinding / rewinding device which winds and rewinds the hot rolled material on the coil,
A mandrel insertion device arranged at one end of the coil; and a tip support device arranged at the other end of the coil to support the tip of the mandrel, the mandrel insertion device comprising: a hollow mandrel inserted into a hollow hole of the coil; And a high temperature gas supply device for supplying a high temperature gas into the mandrel, and a high temperature gas guide plate which is disposed opposite to the coil end face and forms a high temperature gas path. A through-hole is provided for heating the inner surface of the coil wound with the high-temperature gas injected from the through-hole and heating the coil end surface through the high-temperature gas path.
[0015]
Prior to inserting the mandrel into the hollow hole of the coil, the hot gas is supplied from the hot gas supply device into the mandrel and preheated to the temperature of the inner surface of the coil, and then the mandrel is inserted into the hollow hole of the coil from one side and heated. . The hot gas supplied to the inside of the mandrel is blown out from the many through holes provided in the outer periphery of the mandrel to the inner surface of the coil to heat the inner surface of the coil, and then into the hot gas path constituted by the hot gas guide plate and the coil end surface. Enter and heat the coil end face. Thereby, the temperature fall of the hollow hole inner surface and end surface of a coil can be prevented, and a coil can be kept at uniform temperature.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be described below with reference to the drawings. In each figure, common portions are denoted by the same reference numerals, and redundant description is omitted.
FIG. 1 is a longitudinal sectional view showing a first embodiment of a coil heating apparatus according to the present invention. This coil heating device 10 is a heating device for a coil inner surface 11a and a coil end surface 11b for a rewinding / rewinding device that winds and rewinds a hot rolled material on a coil 11, and winds the hot rolled material without a core. Even if it is rewound, it may be wound and rewound using the mandrel as a core.
[0017]
In FIG. 1, a coil heating device 10 of the present invention includes a pair of mandrel insertion devices 14 arranged to face each other. The mandrel insertion device 14 includes a hollow mandrel 13 inserted into the coil hollow hole 12, a mandrel support member 15 that supports the mandrel 13 so as to be slidable in the axial direction, and a mandrel support member 15 fixed to the coil end surface 11b. A hot gas guide plate 16 provided with a gap therebetween, a rack 17 and a pinion 18 for inserting and extracting the mandrel 13 into and from the coil hollow hole 12, and a hot gas supply for supplying the hot gas into the mandrel 13 It is comprised from the pipe | tube 19a and the hot air generator 19 which supplies high temperature gas to this high temperature gas supply pipe | tube 19a.
[0018]
FIG. 2 is a view taken along the line XX of FIG. Referring to FIGS. 1 and 2, a mandrel hollow hole 20 is provided at the center of the mandrel 13, and four high-temperature gas distribution passages 21 are provided outside the mandrel 13 and are connected by an opening 21a. A large number of through holes 22 are provided on the outer periphery of the mandrel 13, and the through holes 22 communicate with the high temperature gas distribution path 21. Thereby, the high temperature gas supplied to the mandrel hollow hole 20 flows into the high temperature gas distribution path 21 from the opening 21a and is ejected from the through hole 22 to the coil inner surface 11a. The mandrel 13 is made of cast iron, and the through hole 22 has a structure in which a ceramic chip 22b having an injection port 22a is embedded in the cast iron.
[0019]
FIG. 3 is a view taken in the direction of arrows YY in FIG. 1 and 3, the hot gas guide plate 16 is a disk provided opposite to the coil end surface 11b, and can be moved to an optimum distance according to the coil width by a position adjusting device (not shown). The gap is adjusted to a predetermined interval, and this interval forms the high temperature gas path 23, and the high temperature gas that has heated the coil inner surface 11a is guided to the coil end surface 11b and heated.
[0020]
The mandrel 13 is inserted into the coil hollow hole 12 and pulled out by a rack 17 coupled to the mandrel 13 and a pinion 18 meshing with the rack 17. Instead of the rack 17 and the pinion 18, a fluid pressure cylinder or a ball screw mechanism may be used.
[0021]
The hot gas supply pipe 19 a is connected to a hot air generator 19, and the hot air generator 19 generates a high temperature gas such as oil, fuel such as gas, or air heated by electricity. For example, when the optimum temperature range of the coil 11 is 1000 to 1200 ° C., the temperature of the high-temperature gas is set slightly higher than this.
[0022]
As described with reference to FIG. 10, the outer diameter of the coil 11 is reduced by rewinding, and the position of the coil hollow hole 12 is also lowered while swinging accordingly. The mandrel insertion device 14 is attached to a swing device (not shown) and can be moved in accordance with the position of the coil hollow hole 12.
[0023]
Next, a second embodiment will be described. FIG. 4 shows a second embodiment, and FIG. 5 shows a view taken in the direction of arrows YY in FIG. This embodiment is different from the first embodiment in that the rectifying plate 24 is provided radially on the hot gas guide plate 16 and the other is the same. As shown in FIG. 5, the rectifying plates 24 are arranged radially from the center of the mandrel 13. Thereby, the high temperature gas which heated the coil inner surface 11a can be uniformly flowed to the coil end surface 11b, and the coil end surface 11b can be heated uniformly.
[0024]
Next, a third embodiment will be described. FIG. 6 shows a third embodiment. In this embodiment, the first or second embodiment has a structure in which two mandrels 13 are inserted opposite to the coil hollow hole 12, and one mandrel 13 is inserted into the coil hollow hole 12 from one side. It has a structure. Therefore, a protrusion 25 is provided at the tip of the mandrel 13 and the protrusion 25 is supported by a tip support member 26. Since the length of the mandrel 13 is increased, the length of the mandrel 13 is increased. Accordingly, the mandrel hollow hole 20 and the hot gas distribution passage 21 are increased, and the number of openings 21a and through holes 22 is increased. The same as in the first or second embodiment. In addition, although the case where the rectifying plate 24 is provided on the high temperature gas guide plate 16 is illustrated, it may not be provided.
[0025]
【The invention's effect】
As described above, the coil heating device of the present invention is configured to supply a high-temperature gas to a mandrel having a hollow structure, provide a through-hole for injecting a high-temperature gas on the outer peripheral portion, and insert the wound coil into the hollow hole. Since it can be preheated to a temperature higher than the inner surface temperature of the coil, temperature drop due to heat removal from the mandrel to the inner surface of the coil can be prevented during insertion of the mandrel, and after insertion, injection of high temperature gas into the coil inner surface and this injected high temperature gas The inner surface and the end surface of the coil can be heated by being guided to the end surface of the coil by the high temperature gas guide plate. By providing the rectifying plate radially on the high temperature gas guide plate, the coil end face can be heated uniformly.
[Brief description of the drawings]
1 is a longitudinal sectional view showing a first embodiment of a coil heating device according to the present invention;
FIG. 2 is a view taken along arrow XX in FIG.
3 is a view taken in the direction of arrows YY in FIG.
FIG. 4 is a longitudinal sectional view showing a second embodiment of the coil heating device according to the present invention.
5 is a view taken in the direction of arrows YY in FIG. 4;
FIG. 6 is a longitudinal sectional view showing a third embodiment of the coil heating apparatus according to the present invention.
FIG. 7 is a schematic diagram of a conventional rolling facility.
FIG. 8 is a schematic view of a conventional coil end face heat-retaining device.
FIG. 9 is a schematic diagram of a conventional coil inner surface heating / heating apparatus.
10 is an AA arrow view of FIG. 9;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Coil 2 Cradle roll 3 Heating device 4 Position adjustment device 5 Notch part 6 Coil inner surface burner 6a Flame 7 Mandrel burner 7a Flame 8 Mandrel 9 Support roll 10 Coil heating device 11 Coil 11a Coil inner surface 11b Coil end surface 12 Coil hollow hole 13 Mandrel 14 Mandrel insertion device 15 Mandrel support member 16 Hot gas guide plate 17 Rack 18 Pinion 19 Hot air generator 19a Hot gas supply pipe 20 Mandrel hollow hole 21 Hot gas distribution passage 21a Opening 22 Through hole 22a Injection port 22b Tip 23 Hot gas passage 24 Current plate 25 Protrusion 26 Tip support material

Claims (3)

A coil heating device for a winding and unwinding device for winding and rewinding a hot-rolled material into a coil,
A pair of mandrel insertion devices arranged opposite to each other, the mandrel insertion device comprising: a hollow mandrel inserted into a hollow hole of the coil; a high-temperature gas supply device for supplying a high-temperature gas into the mandrel; and a coil end face A high temperature gas guide plate that is disposed opposite to form a high temperature gas path, and the mandrel is provided with a through hole for high temperature gas injection on the outer periphery thereof,
A coil heating apparatus characterized by heating an inner surface of a coil wound up by a high temperature gas injected from a through hole for high temperature gas injection and heating an end face of the coil through the high temperature gas path. The coil heating device according to claim 1, wherein the hot gas guide plate is provided with a rectifying plate that is radially arranged around the mandrel side in the hot gas path. A coil heating device for a winding and unwinding device for winding and rewinding a hot-rolled material into a coil,
A mandrel insertion device arranged at one end of the coil; and a tip support device arranged at the other end of the coil to support the tip of the mandrel, the mandrel insertion device comprising: a hollow mandrel inserted into a hollow hole of the coil; And a high temperature gas supply device for supplying a high temperature gas into the mandrel, and a high temperature gas guide plate which is disposed opposite to the coil end face and forms a high temperature gas path. The coil heating device is provided with a through hole for heating, and heats the inner surface of the coil wound with the high temperature gas injected from the through hole and heats the coil end surface through the high temperature gas path. .

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