JPH0596325A - Method for coiling strip - Google Patents

Abstract

PURPOSE:To provide a method for coiling a strip capable of suitably preventing decomposition of the strip by heat radiation at the tip part in coiling of a hot strip without complicating the equipment for a coiling device, making its cost high and lowering the productivity of a line. CONSTITUTION:When the tip part is heated before the strip is coiled through a simple structure provided with a heating device for the strip at the front step of the coiling device so that a heating value taken by the coiling device out of the tip part of the strip is compensated, uniform temperature extends to the whole strip though heat is taken by the coiling device out of the tip part. Consequently, decomposition of the tip part can be prevented suitably in coiling of the hot strip without compricating the equipment of the coiling device, making its cost high and lowering the productivity of the line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a hot strip at a stage subsequent to a treatment line where strips are continuously passed and treated in a heated state, such as hot strip rolling equipment and thin continuous casting equipment. The present invention relates to a strip winding method for winding, and particularly to a strip winding method for preventing a temperature drop of the strip during winding.

[0002]

2. Description of the Related Art For example, in a hot strip rolling mill, a strip is passed through a heating furnace, a rough rolling mill, a delay table, a finishing rolling mill, a cooling device, etc. to perform rolling treatment in a predetermined cycle. .. Then, the rolled hot strip is wound around the mandrel of the coiler as a coil. At this time, since the mandrel has a relatively low temperature, in order to prevent local deterioration of the metal structure due to local rapid cooling of the leading end portion of the strip, for example, Japanese Patent Publication No.
As disclosed in JP-A-49335, a heating device is externally inserted into the inner peripheral portion of the mandrel to heat the mandrel from the inside in advance, or as disclosed in JP-B-61-35292. A heating device is provided on the outer peripheral surface of the mandrel so that the starting end portion is directly heated during winding.

[0003]

However, in the case where the mandrel is heated from the inner peripheral side by the heating device, the structure of the mandrel itself is complicated, and the external heating device is inserted into and removed from the inner peripheral part of the mandrel. Since the equipment is complicated, the entire apparatus tends to be complicated and large, and the equipment cost thereof tends to rise. Further, it is necessary to secure a working time and a heating time for inserting / removing the heating device into / from the inner peripheral portion of the mandrel, which causes a problem that productivity is lowered.

On the other hand, in the case where the heating device is provided on the outer peripheral surface of the mandrel, the heating device is apt to be damaged due to impact or abrasion at the time of winding, and the mandrel is a consumable item. Had to be replaced, and there was the problem that equipment costs would rise.

The present invention has been made in view of the above-mentioned problems of the prior art, and its main purpose is to prevent the equipment of the winding device from becoming complicated and the cost from increasing, and It is an object of the present invention to provide a strip winding method capable of suitably preventing deterioration of the starting end portion of the hot strip due to heat radiation during winding of the hot strip without lowering line productivity.

[0006]

SUMMARY OF THE INVENTION According to the present invention, the above object is a strip winding method for continuously winding a hot strip treated in a heated state into a coil with a winding device. In order to compensate for the amount of heat taken from the starting end portion of the strip by the winding device, the starting end portion is preheated before winding by a strip heating device provided in the preceding stage of the winding device. It is achieved by providing a strip winding method.

[0007]

According to the above-mentioned structure, the same amount of heat as the amount of heat taken up by the winding device is applied to the starting end portion of the hot strip before winding, so that the starting end portion and other portions are not cooled even when rapidly cooled. Becomes a uniform temperature.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 shows a schematic construction of a hot strip rolling mill to which the present invention is applied. A slab is supplied from the entrance of this equipment, heated in a heating furnace 1, then subjected to horizontal rolling and edging in a rough rolling mill 2, and heated to a finish rolling temperature in a delay table 3 as a rough bar. Then, after being rolled by the finish rolling mill 4 and cooled to an appropriate temperature by the cooling device 5, the winder 6 is used as a hot strip.
It is wound around the mandrel 7 as a coil. A plurality of mandrels 7 are arranged in series in the winder 6, and one mandrel 7 winds the coil and at the same time removes the coil from the other mandrel 7.

On the other hand, between the cooling device 5 and the winding device 6, a strip heating device 8 is provided immediately in front of the winding device 6. Further, in front of the heating device 8, a sensor 9 for detecting the tip of the strip is provided.

Next, the operating procedure of this embodiment will be described.

The hot strip which has been passed through the heating furnace 1, the rough rolling mill 2, the delay table 3, the finishing rolling mill 4 and the cooling device 5 and which has been rolled is guided by a plurality of conveying rollers 10 and pinch rollers 11, It is wound as a coil on one mandrel 7. At this time, when it is detected that the starting end of the strip has passed through the sensor 9, the heating device 8 is activated to heat the starting end portion of the strip to a predetermined temperature (heat amount). Therefore, the mandrel 7 before winding is at a relatively low temperature, and a certain amount of heat is taken from the starting end portion of the strip to the mandrel 7, but since the amount of heat for that amount is compensated by the heating device 8 in advance, The temperature is uniform over the entire strip, and there is no risk of partial deterioration.

[0013]

As is apparent from the above description, according to the strip winding method of the present invention, the strip winding device is provided at the front stage of the winding device so as to compensate the amount of heat taken from the starting end portion of the strip by the winding device. By heating the starting end portion in advance with a simple structure having only a heating device for the strip before winding, even if heat is taken from the starting end portion by the winding device, the entire strip has a uniform temperature. Therefore, it is possible to suitably prevent the deterioration of the starting end portion at the time of winding the hot strip without complicating the equipment of the winding device, increasing the cost, and decreasing the line productivity. From the above, the effect of the present invention is great.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of hot strip rolling equipment to which the present invention is applied.

[Explanation of symbols]

 1 Heating Furnace 2 Rough Rolling Mill 3 Delay Table 4 Finishing Rolling Mill 5 Cooling Device 6 Winding Machine 7 Mandrel 8 Heating Device 9 Sensor 10 Conveying Roller 11 Pinch Roller

Claims (1)

[Claims] 1. A method of winding a strip for continuously winding a hot strip processed in a heated state into a coil by a winding device, wherein the winding device removes the strip from the starting end portion. A method of winding a strip, characterized in that the starting end portion is preheated before winding by a strip heating device provided in a preceding stage of the winding device so as to compensate for the amount of heat.