JPH04354825A - Mehtod for heating/cooling wire rod coil - Google Patents

Abstract

PURPOSE:To provide a heating/cooling method for a wire rod coil by which uneven heat treatment is prevented and the dispersion in the quality and the deformation of the coil are released. CONSTITUTION:In the method for executing the annealing heat treatment to the wire rod coil 1 in a continuous annealing furnace 2, the heat treatment of temp. raising, soaking, cooling, etc., is executed while intermittently rotating relevant wire rod coil 1 at plural positions or continuously rotating it during the carrying of the wire rod coil 1 in the continuous annealing furnace 2.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for heating and cooling a wire coil when the wire coil is subjected to annealing heat treatment, for example, in a continuous annealing furnace.

0002

2. Description of the Related Art Generally, a continuous annealing furnace 2 for annealing a wire coil 1 is constructed as shown in FIG. That is, the continuous annealing furnace 2 is a tunnel-type furnace that has multiple zones of 5 to 12, and the temperature can be set for each zone.Heating elements 3 are installed above and below (or on the left and right), and the wire coil 1 is connected to the furnace. It has a structure in which it is conveyed on a conveyance line 4 in 2. In addition, 5 in FIG. 5 is a fan for stirring inside the furnace. In the above configuration, while the wire coil 1 is conveyed in the furnace 2, heat transfer from the furnace gas heated by the heating element 3, and the heating element 3, the inner wall of the furnace 2, and the wire coil Heat treatment for heating or cooling is performed using radiant heat from 1.

Conventionally, when the wire rod coil 1 is conveyed through the continuous annealing furnace 2, the wire rod coil 1 is transferred to the conveyor line 4.
It was intended to convey the upper part without changing the direction (without rotating).

0004

However, in the conventional wire coil heat treatment method as described above, during heating or cooling, the front portion A,
Variation in temperature between rear part C and both sides B, that is, each part A
, B, and C in the heating rate or cooling rate. Specifically, as a representative example, each part A, B, and C shown in FIG.
The phenomenon is similar to the temperature history of When such a phenomenon occurs, the following problems occur. First of all, the quality after annealing varies. In addition, since the temperature rise rate of the front part A and both side parts B of the wire rod coil 1 is fast, and the timing of thermal expansion of the parts A and B is fast, the shape of the wire rod coil 1 stretches back and forth in the traveling direction, as shown in FIG. As a result, the roundness of the coil deteriorates, causing problems in subsequent handling, etc. Furthermore, since the heating rates of each part A, B, and C are different, in the conventional example, there is a difference of 3 hours between the front part A and the rear part C in the time it takes to reach the maximum temperature (see Fig. 6).
Since the annealing heat pattern needs to be set in accordance with the part with the slowest heating rate, there is a problem in that the heating time is inevitably long. This also applies during cooling.

In view of the above-mentioned conventional problems, the present invention aims to provide a method for heating and cooling a wire coil that prevents uneven heating and cooling of the wire coil and alleviates variations in quality and deformation of the coil. It was done for a purpose.

[0006]

[Means for Solving the Problems] In order to solve the above-mentioned problems, a method for heating and cooling a wire rod coil according to the present invention provides a method for heating and cooling a wire rod coil in a heat treatment furnace, in which the wire rod coil is being transported in the heat treatment furnace. In this case, the wire coil is conveyed while being rotated intermittently or continuously.

[0007]

[Operation] Since the present invention is constructed as described above, the wire coil can be heated and cooled uniformly over the entire circumferential surface of the wire coil by intermittent or continuous rotation while the wire coil is being transported through a continuous heat treatment furnace. It will be held in

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for heating and cooling a wire coil according to the present invention will be explained in detail with reference to embodiments shown in FIGS. 1 to 4. FIGS. 1(a) and 1(b) show schematic explanatory views of embodiments of the present invention, and FIG. 1(a) is a first embodiment in which a wire coil 1 is intermittently rotated while being transported in a continuous annealing furnace 2. of,(
b) is a second embodiment in which a wire rod coil 1 is transferred to a continuous annealing furnace 2.
An example is shown in which the interior is continuously rotated during transportation.

That is, in the first embodiment shown in FIG. 1(a), the wire coil 1 is intermittently rotated while being transported in the continuous annealing furnace 2, and is rotated by 180 degrees at two locations, for example. The wire coil 1 undergoes heat treatment such as heating up, soaking, and cooling, and due to this rotation, the wire coil 1 receives even heat radiation from the heating element, the inner wall of the furnace, and the front and rear wire coils 1. . The annealing heat pattern of each part of the wire coil 1 in this first embodiment is as follows:
The temperature changes as shown in Fig. 2, and the initial slope of the temperature change at the front part A and the rear part C of the wire coil 1 is reversed at the first rotational position X, and then reversed again at the second rotational position Y. Therefore, the temperature variations in each part A, B, and C of the wire coil 1 are reduced as a whole.

In the second embodiment shown in FIG. 1(b), the wire coil 1 is continuously rotated while being conveyed through the continuous annealing furnace 2, thereby increasing and soaking the temperature of the wire coil 1. ,
It performs heat treatment such as cooling, and by this rotation,
Similar to the first embodiment, the wire coil 1 includes a heating element, an inner wall of the furnace,
Thermal radiation from the front and rear wire rod coils 1 is equally received. The annealing heat pattern (not shown) of each part of the wire coil 1 in this embodiment, that is, each part A, B
, C are reduced more than in the first embodiment.

FIG. 3 shows the above-mentioned wire rod coil 1 in a continuous annealing furnace 2.
2 is a schematic plan view of a conveyance line 4 as a specific example of the first embodiment in which the inside of the conveyance line 4 is intermittently rotated during conveyance. In FIG. 3, reference numeral 6 denotes a conveying roller provided on the conveying line 4. A turning device 7 is disposed in the middle of the conveying roller 6, and the wire rod coil 1 is conveyed by this turning device 7.
I'm trying to rotate it 180 degrees. That is, the turning device 7 is provided with a roller 8 located on the same plane as the conveying roller 6, and a stopper is provided in front of the turning device 7 so that the wire coil 1 is positioned and stopped on the turning device 7. 9 is placed. Although not shown, the stopper 9 protrudes above the conveying roller 6, and when the wire coil 1 stops at this stopper 9, the turning device 7 rotates, and when the rotation ends, the stopper 9 is once lowered. The wire coil 1 can be fed out, and the wire coil 1 rotated by 180 degrees is configured to be fed onto the next conveying roller 6 by the drive of the roller 8.

Next, FIG. 4 shows a schematic plan view of the conveyance line 4 as a specific example of the second embodiment of continuous rotation. In FIG. The wire coil 1 is conveyed by the conveyance roller 10 which is diagonally arranged, and the wire rod coil 1 conveyed by the conveyance roller 10 is sent diagonally with respect to the direction of the conveyance line 4 by the rotation of the conveyance roller 10, and the wire coil 1 is conveyed by the conveyance roller 10 in a diagonal direction with respect to the direction of the conveyance line 4. By disposing the side rollers 11, the wire coil 1 is conveyed forward of the conveyance line 4 while being in contact with the side rollers 11 and rotating in the direction shown in the figure. That is, the conveyance line 4
It will be conveyed while rotating continuously on the top. Note that instead of the side rollers 11, a belt rotating in a direction opposite to the traveling direction of the wire coil 1 may be installed over the entire length of the conveyance line 4.

[0013]

As described above, the present invention provides a method for heating and cooling a wire coil in a heat treatment furnace. By doing so, during heat treatment such as heating up, soaking, and cooling, the wire coil receives even heat radiation from the heating element, the inner wall of the furnace, and the front and rear wire coils, resulting in heating, soaking, and cooling. The heat treatment will be uniformly performed over the entire circumferential surface. therefore,
This is a very effective invention because it greatly reduces the variation in product quality of wire coils, shortens heat treatment time, and alleviates deformation of wire coils.

[Brief explanation of drawings]

FIG. 1(a) is a schematic explanatory diagram of a method for heat treatment of a wire coil according to a first embodiment of the present invention, and FIG. 1(b) is a schematic explanatory diagram of a second embodiment of the present invention.

FIG. 2 is a diagram of a thermal annealing heat pattern of the first embodiment.

FIG. 3 is a plan view showing a specific example of the first embodiment.

FIG. 4 is a plan view showing a specific example of the second embodiment.

FIG. 5 is a schematic diagram of a general continuous annealing furnace for wire rod coils.

FIG. 6 is an annealing heat pattern diagram of a conventional wire coil heat treatment method.

FIG. 7 is a diagram showing a modified example of a coil according to the conventional wire coil heat treatment method.

[Explanation of symbols]

1 Wire coil 2 Continuous annealing furnace 4 Conveyance line 6,10 Conveyance roller 7 Swivel device 11 Guide roller

Claims (1)

[Claims] 1. A method of heating and cooling a wire rod coil in a heat treatment furnace, wherein the wire rod coil is transported while being rotated intermittently or continuously while the wire rod coil is being transported in the heat treatment furnace. heating and cooling methods.