JPH0461049B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an overaging treatment method and an overaging furnace for producing a uniform overaged structure in a continuous steel strip.

<Prior Art> Fig. 2 shows an example of a conventional continuous annealing furnace. As shown in the figure, the continuous annealing furnace includes an entrance looper 1, a heating/soaking furnace 2, a first cooling zone 3, an overaging furnace 4, a second cooling furnace 5, and an exit looper 6. . That is, the steel plate strip (hereinafter referred to as strip) 0 is passed through the input side looper 1 to avoid line stoppage on the input side when connecting a coil (not shown), and then passed through the heating/soaking furnace 2. The steel is heated and maintained at 700 to 800°C according to the treatment conditions depending on the steel type, then cooled to about 400°C in the first cooling zone 3, and then kept at the cooling end temperature (about 400°C) in the overaging furnace 4 for a predetermined period of time. (This is called over-aging treatment and requires approximately 3 minutes or more, although it varies depending on the type of steel.) Furthermore, after the over-aging treatment, strip 0 is at a non-oxidizing temperature. It is cooled to about 200 to 150° C. in the second cooling furnace 5, and then passes through an output looper 6 and a cutter (not shown), and then reaches a winder (not shown) and is wound up. The area from the heating/soaking furnace 2 to the second cooling furnace 5 is shielded from the outside air, and seal rolls 7 are arranged on the inlet and outlet sides, and the inside thereof is filled with a reducing gas, for example, a mixture of nitrogen and hydrogen. ing.

<Problems to be Solved by the Invention> In such a conventional continuous annealing furnace, regarding the overaging furnace 4, (1) a long overaging furnace is required simply to satisfy the overaging time; (2) depends on the maximum line speed, and at other line speeds there are problems of large size and (2) complication that a heating device is required to keep the strip temperature approximately constant. In other words, since the overaging furnace only allows the overaging time to pass without any particular temperature change, for example, if the overaging time is 5 minutes and the line speed is 400 m/min, the line length in the overaging furnace is 2000 m. The distance between the upper roll and the lower roll for stretching the strip is 20 m.
In this case, approximately 100 passes would be required, and the dimensions of the overaging furnace would be extremely large. Furthermore, the temperature of the strip 0 must be kept constant in the furnace, but since heat radiation from the furnace body is unavoidable, it is necessary to provide a heating device such as an electric heater to prevent the temperature of the strip from decreasing.

In view of the above-mentioned prior art, the present invention provides a method for overaging a steel plate strip and an overaging furnace that can generate a uniform overaged structure over the entire length of a continuous strip in a small space. The purpose is to eliminate the increase in size and complexity.

<Means for Solving the Problems> In order to achieve the above object, the overaging treatment method of the present invention is such that, in a continuous annealing furnace, a steel sheet strip cooled in a first cooling zone is kept at the cooling end temperature for a predetermined period of time. The method includes at least two reels for winding the steel strip to form a first coil while maintaining the steel strip after passing through the first cooling zone at the overaging temperature. The steel plate strip is wound on one reel of a first carousel type reel in which the two reels revolve around one rotation center to form a first coil, and the steel plate strip is wound on the reel on which the steel plate strip is not wound. At least two reels are provided for cutting a coil from a steel plate strip, paying out the steel plate strip from a first coil cut from the steel plate strip, and winding up the steel plate strip paid out from the first coil to form a second coil. The steel plate strip unwound from the first coil is wound into a second coil with the reel of two carousel type reels in which the at least two reels revolve around one rotation center, and the steel plate strip is wound into a second coil. It is characterized in that the steel plate strip is fed out from the top and connected to the preceding steel plate strip to form a continuous strip.

On the other hand, the configuration of the overaging furnace of the present invention for achieving the above object is such that the overaging furnace is a continuous annealing furnace in which the steel strip cooled in the first cooling zone is kept at the cooling end temperature for a predetermined period of time. a first carousel-type reel provided with at least two reels for winding the steel plate strip to form a first coil, and in which the at least two reels revolve around a single rotation center; A steel plate strip cutting means for cutting a first coil wound on one reel from the steel plate strip on a reel on which the steel plate strip is not wound; and a steel plate strip cutting means for cutting the steel plate strip unwound from the first coil again. A second carousel type reel is provided with at least two reels serving as a second coil, and the two reels revolve around a single rotation center, and a steel plate strip fed out from the second coil is connected to a preceding steel plate strip. The invention is characterized in that it is equipped with a connecting means.

<Function> In the overaging treatment method and overaging furnace of the present invention, a steel plate strip is wound onto one reel of a first carousel type reel to form a first coil, and then the first coil is Once unwound and re-wound from the rear end of the strip onto one reel of a second carousel type reel to form a second coil, the steel plate strip unwound from this second coil is then connected to the preceding steel plate strip, Since the strip is continuous, both the leading and trailing ends of the steel strip can be maintained at a uniform overaging temperature in a small amount of space, and a uniform overaging structure can be generated over the entire length of the steel strip. .

<Example> FIG. 1 shows a schematic configuration of a first cooling zone and an overaging furnace in a continuous annealing furnace equipped with an overaging furnace according to an example of the present invention.

As shown in the figure, the first cooling zone 3 is equipped with a gas jet cooling device 11, a tension bridle 12, and a pinch roll 13. In addition, the overaging furnace 14 has three reels 15a, 15b, 1 having suction ability.
5c is a first carouselle type reel attached to one rotatable reel main body 16a, and three reels 17a, 17b, 17c, which also have suction ability, are one rotatable reel. The second one attached to the reel body 18a
A carousel type reel for rewinding 18 which is a carousel type reel for winding, a cutting device 19 capable of cutting the strip 0 on the reel 15 of the carousel type reel 16 for winding and retreating from the reel 15;
A strip connecting device 20 that connects the strip 0 to the preceding strip, a belt guide 21 that guides the strip 0 from the take-up carousel reel 16 to the rewinding carousel reel 18, and a belt guide 21 that guides the strip 0 from the rewinding carousel reel 18 to the strip connecting device 20. It is equipped with a belt guide 22 for guiding.

That is, the strip 0 that has entered the first cooling zone 3 is rapidly cooled by the gas jet cooling device 11 to 450 to 350° C., which is the overaging treatment start temperature, and then transferred from the heating and soaking furnace 2 by the tension bridle 12 to the gas jet cooling device 11. The tension up to is controlled.

Next, the strip 0 passes through the pinch roll 13 and reaches the take-up carousel reel 16, where it is sucked onto the reel 15a at position X in the figure and is taken up. Just before the winding is completed, the reel body 16a is rotated counterclockwise in the figure. The reel 15a is rotated to move to the Y position in the figure, and the strip 0 is placed along the reel 15b. In this state, the cutting device 19 is brought close to the Y position in the figure, and the strip 0 is cut on the reel 15b, and the first coil 15 is placed on the reel 15a.
is wound up. The following strip 0 is marked with an X in the diagram.
At this point, the strip is sucked by the reel 15b and taken up, and just before winding is completed, the reel body 16a is rotated counterclockwise in the figure, and the reel 15b is moved to the Y position in the figure, so that the strip 0 is aligned with the reel 15c. The strip 0 is again cut by the cutting device 19 on the reel 15c at the X position in the figure, and a new first coil 15 is wound onto the reel 15b. Thereafter, the first coil 15 is similarly wound onto the reel 15c.

On the other hand, the first reel wound on the reel 15a, which has been moved to the Z position in the figure due to the rotation of the reel main body 16a.
The coil 15 is unwound from the rear end side by the belt guide 21 and reaches the carousel type reel 18 for rewinding, and the strip 0 unwound from the first coil 15 is attracted to the reel 17a at position x in the figure and is unwound. The second coil 17 is wound onto the reel 17a. When winding of the second coil 17 is completed, the reel main body 18a is rotated counterclockwise in the figure, and the reel 17a is moved to the y position in the figure, and the first coil 17a is wound on the reel 15b at the x position in the figure. The strip 0 unwound from the second coil 15 is attracted and wound onto the reel 17b, and the second coil 17 is wound onto the reel 17b. Similarly, the second coil 17 is wound on the reel 17c, and the second coil 17 is wound on the reel 17c, and the second coil 17 is wound on the reel 17c.
The second coil 17 moved to the belt guide 2
Unrolled by 2, unrolled strip 0
is sent to the strip connecting device 20 and connected to the trailing end of the preceding strip 0. The connected continuous strip 0 is sent to a second cooling furnace.

In other words, the strip 0 sent to the overaging furnace 14
A first coil 15 is formed by a take-up carousel reel 16, and this first coil 15 is designed to replace the leading and trailing ends of the strip 0 after a certain period of time due to the rotation of the take-up carousel reel 16. The second coil 17 is unwound on the rewinding carousel reel 18, and the second coil 17 is unwound after a certain period of time by the rotation of the rewinding carousel reel 18. Since strip 0 is connected to the preceding strip 0 using the connecting device 20, strip 0 can be made into a coil in a small amount of space, and the coil can be re-wound, and overaging treatment can be performed uniformly in the longitudinal direction of strip 0. It is.

Furthermore, the moving speed of strip 0, reel 15a,
The winding speeds of the reels 15b, 15c, 17a, 17b, and 17c and the rotational speeds of the carousel reels 16 and 18 are synchronously controlled.

In the above embodiment, the winding carousel type reel 1
6. Three reels of the rewinding carousel type reel 18 were provided, but the number of reels was determined according to the length of the strip 0 to be manufactured.
As long as there are at least two or more, it is not limited to the above embodiment.

<Effects of the Invention> In the present invention, a carousel type reel is used to wind a strip to form a first coil, and then the strip is fed out from the first coil, and a carousel type reel is used to rewind the strip to form a second coil. Since the strip is then unwound from the second coil and connected to the preceding strip, the entire length of the strip can be overaged in an extremely small amount of space. As a result, it is possible to eliminate the increase in size and complexity of the overaging furnace.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a first cooling zone and an overaging furnace in a continuous annealing furnace equipped with an overaging furnace according to an embodiment of the present invention, and FIG. 2 is a schematic diagram of a conventional continuous annealing furnace. be. In the drawing, 14 is an overaging furnace, 15a, 15b, 1
5c is a reel, 16 is a carousel type reel for winding, 16a is a reel body, 17a, 17b, 17
c is a reel, 18 is a carousel type reel for rewinding,
18a is a reel body, 19 is a cutting device, and 20 is a connecting device.

Claims (1)

[Scope of Claims] 1. An overaging treatment method in which a steel plate cooled in a first cooling zone in a continuous annealing furnace is kept at the cooling end temperature for a predetermined period of time, the steel plate having passed through the first cooling zone. While maintaining the strip at the overaging temperature, the steel strip is wound into a first
At least two reels are provided as a coil, and the two reels revolve around a single rotation center.The steel plate strip is wound on one reel of a first carousel type reel to form a first coil, and the steel plate strip is wound into a first coil. Cutting the first coil from the steel sheet strip on an unwound reel, paying out the steel sheet strip from the first coil cut from the steel sheet strip, and winding up the steel sheet strip unwound from the first coil. A second carousel-type reel is provided with at least two reels serving as a second coil, and the at least two reels revolve around a single rotation center. An overaging treatment method characterized in that a second coil is used, and a steel plate strip is fed out from the second coil and connected to the preceding steel plate strip to form a continuous strip. 2. In an overaging furnace of a continuous annealing furnace in which the steel plate strip cooled in the first cooling zone is kept at the cooling end temperature for a predetermined period of time, there are at least two reels for winding the steel plate strip to form a first coil. A steel plate strip is wound around a first carousel type reel provided with the at least two reels revolving around one rotation center, and a first coil wound on one reel of the first carousel type reel. a steel plate strip cutting means for cutting the steel plate strip on a reel that is not in use; and at least two reels for rewinding the steel plate strip unwound from the first coil to form a second coil; An overaging furnace characterized by comprising a second carousel type reel that revolves around a single rotation center, and a strip connecting device that connects a steel plate strip unwound from the second coil to a preceding steel plate strip.