JPS6159181A - Method of preventing overheat of edge of material to be heated in continuous type heating furnace - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for heating materials to be heated in parallel in a continuous heating furnace such as a walking beam heating furnace, and particularly to a method for heating materials in parallel in a continuous heating furnace such as a walking beam heating furnace. This invention relates to a method for preventing overheating of the edge of a heated material in a continuous heating furnace.

[Prior art l] Continuous heating furnaces such as walking beam heating furnaces heat slabs (steel slabs) manufactured by continuous casting or blooming to a predetermined temperature in order to roll them from thick plates to thin plates.
It is desirable to heat the slab to a uniform temperature as much as possible over the entire surface of the slab.

A conventional continuous heating furnace will be explained with reference to FIGS. 7 to 10.

As shown in FIGS. 7 and 9, a fixed beam 4 extending from the charging end 98i2 of the heating furnace 1 to the discharge end 3 is provided in the heating Pl.
and moving beam 5 are connected to the heating furnace 1 by means of legs 4a and 5a.
are provided at appropriate intervals in the width direction. Although the moving beam 5 is not shown, its legs 5a extend from the bottom of the heating furnace 1 and are attached to a moving truck, and by moving the moving beam 5 up, forward, down, and backward with the moving truck, the fixed beam 4 is moved from the charging end 2. and the heated material 6 supplied onto the moving beam 5
is moved to the unloading end 3 side. That is,
The material to be heated 6 is supported by the moving beam 5 as the moving beam 5 rises, and is moved by the advancement of the moving beam 5. Then, when the moving beam 5 descends below the fixed beam 4, the heated material 6 is supported by the moving beam 5. The material to be heated 6 is sequentially moved toward the discharge end 3 by moving the moving beam 5 (in this state) forward and upwardly.

In this case, the materials to be heated 6 are charged in parallel as shown in FIG.
may be moved on the same moving cart or on separate moving carts.

A plurality of burners 7 are provided in the heating furnace 1 to heat the material to be heated 6. For example, as shown in FIG. ;
When divided into L+, heating area L2, and soaking area L3, the burner 7 is arranged so that the temperature distribution in the area maintains a temperature distribution like the polygonal line indicated by a in the figure, as shown in FIG. The material to be heated 61 is charged at the end 2f)s
From t to the discharge end 3, a reference temperature curve as shown by b in the figure is made, so that the heated material 6 reaches the target temperature T at the discharge end 3.

[Problems to be solved by the invention] However, as shown in FIG.
Both end portions 6a, 6a of are overheated and become high. That is,
As shown in FIG. 10, there is heat input from each end, so the temperature of the end 6a becomes higher than the center, and therefore the temperature distribution in the width direction of the parallel heated materials 6 shown in FIG. Temperature unevenness occurs in the width direction as shown by curve C. That is, the temperature curves at both ends 5a, 5a are shown in FIG.
As shown in , the temperature is higher than the reference temperature curve.

On the other hand, the temperature of the portions that come into contact with the fixed beam 4 and the moving beam 5 tends to decrease, resulting in a temperature curve indicated by e in the figure. This cold spot has been improved in recent years by improving the fixed beam 4 and the moving beam 5, but the end 6a side has not been much of a problem until now, but it is necessary for improving the quality of the product. Normally, as shown in Fig. 8, the heating area L2 is set about 100°C higher than the target temperature T to improve the rising characteristics of the reference temperature curve.
The base Q-water temperature at tL3 is 20 to 40℃ lower than the target temperature T.
However, if the temperature in the furnace in the heating zone L2 is avoided to rise in this way, the temperature at the end 6a of the material to be heated 6 will rise even more than the temperature T at J:A, which is not preferable. Therefore, if the temperature of the heating region L2 is prevented from rising above the target temperature T, the temperature rise of the end portion 6a can be suppressed, but the temperature rise of the entire heated material 6 becomes worse and as a result, the target temperature is lowered. The temperature T will not be reached, which is undesirable.

[Object of the Invention] The present invention has been made in consideration of the above-mentioned circumstances, and provides a cover for a continuous heating furnace that can prevent overheating at both ends when heat treating materials to be heated in parallel in a continuous heating furnace. The purpose of this invention is to provide a method for preventing overheating of heating material edges.

[Summary of the invention] In order to achieve the above object, the present invention supplies plate-shaped materials to be heated in parallel on a moving beam and a fixed beam in a heating furnace, and raises, advances, and lowers the moving beam.・Go backwards,
In the method of moving and heat-treating the parallel heated materials, opposite ends of the parallel heated materials are brought into close proximity and fed into the furnace, and the other end of the parallel heated materials is shielded. It is characterized by being moved while being insulated by a heat plate, and because the opposite ends of the parallel heated materials are placed close to each other, heat input from each end face is blocked, and the other end Since heat input is blocked by the heat shield plate, overheating at both ends is prevented and a uniform temperature distribution is achieved in the width direction of both wave heating materials.

[Embodiments] Hereinafter, preferred embodiments of the method for preventing overheating of the edge of a heated material in a continuous heating furnace according to the present invention will be described with reference to the accompanying drawings.

Fig. 1 shows a cross section in the width direction of a continuous heating furnace such as a walking beam heating furnace.
As explained in the conventional example of FIG. 9, each of the beams 4 and 5 is provided along the discharge 9'jA 3 from the charging pane 2 of the heating furnace 1, and the moving beam 5 moves upward, forward, downward, and backward. The plate-shaped material to be heated 6 is moved from the charging end 2 to the unloading end 3. The material to be heated 6 supplied onto the moving beam 5 and the fixed beam 4 is placed at their opposing ends 6a as shown in FIG.
, 5a are charged in parallel so as to be close to each other.

In this case, the front and rear ends of the material to be heated 6 are also charged so as to be close to each other, but if the material to be heated 6 is a continuous elongated object within Class 1, it is charged as is. The other end portions 6a, 6a of the parallel heated materials 6.6 are prevented from receiving heat from their end faces by the heat shield plate 11. As shown in FIG. 1, the heat shield plate 11 is connected by a pin 10 to a support member 9 which hangs from both sides of the upper part of the heating furnace 1 so as to be rotatable in the width direction thereof. This heat shield plate 11 includes a heat insulating part 12 facing the heated material 6 side and a support frame part 13 for supporting the heat insulating part 12. There are heat shield plates on both sides of the heating furnace 1, and the heat shield plates 11 are placed on both sides of the heated material 6. WIM the location of
A horizontal displacement device 14 is provided for the purpose.

This horizontal movement device 14 is supported on brackets 15 provided on both side walls of the heating furnace 1, and is connected to a cylinder 16 arranged to face in the width direction and a rod 17 of the cylinder 16. A connecting rod 1 connected to a pin 10 passing through the support member 9 and connecting the heat shield plate 11.
The support member 9 can be rotated in the width direction by expanding and contracting the rod 17 of the cylinder 16, and the position of the heat shield plate 11 can be adjusted. As shown in FIG. 3, when the heated material 6 moves, the heat shield plate 11 moves from the position shown by the solid line (the position supported by the fixed beam 4) to the position shown by the two-dot chain line (the moving beam 5). Since it moves up and down between the raised position), it is formed to have a vertical length close to the end 6a in the range of vertical movement, and although not shown in the figure, for example, the heating The length is approximately equal to the length of the area L2 or the length of the heating area L2 and the soaking area L3. In addition, the heat shield plate 11
The heat insulating material 12 is made of a heat insulating material that can withstand high temperatures and is made of an elastic material such as ceramic fiber or mineral fiber, and the supporting frame 13 is made of a ceramic molded product.

As described above, the materials to be heated 6 are arranged in parallel on the fixed beam 4 and the moving beam 5 in the heating furnace 1, and the opposing ends 6a,
6a is supplied and moved in close proximity and heated in the heating furnace 1. In this case, opposite ends 6 of the material to be heated 6
a are close to each other, heat input from between them is blocked and overheating is prevented, and a heat shield plate 11 is placed close to the other end 6a of the parallel heated materials 6. ,
Heat input from the end face is prevented, and overheating of the end portion 6a is prevented. In this case, the heat insulating material 12 of the heat shield plate 11
If ceramic fiber, mineral fiber or the like is used for the material, the end 6a will not be damaged even if it hits the end 6a during movement.

Further, as explained in FIGS. 7 and 8, if the heat shield plate 11 is provided in the heating area L2 where overheating is likely to occur, overheating can be prevented, but if it is also provided in the soaking area L3, further overheating can be prevented. can be prevented.

°The material to be heated 6 that has been heat-treated and carried out from the heating furnace 1 is then sent to an appropriate rolling process and rolled, but since the end portion 6a of the material to be heated 6 is prevented from overheating, the temperature is uniform in the width direction. Therefore, the accuracy of the plate thickness and plate width after rolling is improved, and the quality can be improved.

4 to 6 do not show other embodiments of the present invention; FIGS. 4 and 5 show an example in which the shape of the heat shield plate 11 is changed, and FIG. 6 shows an example in which the horizontal moving device 14 is changed. No examples were given.

In FIG. 4, the heat shield plate 11 is formed to have an inverted cross-section, and the part 9 of the heated material 6 is configured to control the heat input from the upper surface side of the portion 6a. The heat shield plate 11 is formed into a cross-sectional shape to control heat input from the upper and lower surfaces of the end portion 6a, depending on the degree of overheating of the end portion 6a or within the heating furnace 1. This is appropriately adopted depending on the heat convection of the end portion 6a to prevent overheating of the end portion 6a.

FIG. 6 shows a horizontal movement device 14 for adjusting the position of the heat shield plate 11.
Another embodiment is shown in which the heat shield plate 11 is supported horizontally movably on a bracket 20 provided on the outer wall of the heating furnace 1, and is supported by five horizontal rods 21 passing through the outer wall. . The horizontal moving device 14 consists of a horizontal rod 21, a cylinder 22 for moving the horizontal rod 21, a link lever 23, etc. The cylinder 22 is supported by a bracket 24 on the upper side wall of the heating furnace 1, and the link lever 23
The upper end is rotatably connected to the bracket 24, the lower end is connected to the horizontal rod 21, and the middle is connected to the rod 25 of the cylinder 22, and the link lever 23 is rotated by the expansion and contraction of the rod 25. The horizontal rod 21 is moved horizontally in the width direction to adjust the position of the heat shield plate 11.

In the horizontal movement device 14 shown in FIG. 1, the heat shield plate 11 is suspended from the support member 9 and therefore moves slightly up and down during position adjustment, but in this embodiment, it moves horizontally and does not move up and down.

[Effects of the Invention] As is clear from the detailed description above, the present invention exhibits the following excellent effects.

(1) When materials to be heated are charged in parallel into a heating furnace, by charging their opposing ends close together, heat input from the opposing ends can be prevented and overheating can be prevented. At the same time, the other end can be provided with a heat shield plate to prevent overheating of that end.

(2) Therefore, the temperature of the heat-treated material to be heated becomes uniform in its width direction, and when it is subsequently rolled, the vU degree of the plate thickness and plate width are improved, and quality can be improved.

(3) Since overheating of the end of the material to be heated can be prevented, the heating capacity can be made significantly higher than the target temperature in the heating region, and the fuel consumption rate can be reduced accordingly, resulting in energy savings.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing an embodiment of the method for preventing overheating of the edge of a heated material in a continuous heating furnace of the present invention, Fig. 2 is an enlarged view of the main part of Fig. 4 and 5 are sectional views showing other embodiments of FIG. 2, and FIG. 6 is a continuous heating furnace according to the present invention. Fig. M7 is a front sectional view of a continuous heating furnace, and Fig. 8 shows the furnace temperature in the continuous IIO heating furnace of Fig. 7. Figure 9 is a side sectional view of a conventional continuous heating furnace and a diagram showing the temperature distribution of the heated material in the furnace. It is a diagram explaining the heat input shape of the heated material. In the figure, 1 is a heating furnace, 4 is a fixed beam, 5 is a moving beam,
6 is a material to be heated, and 11 is a heat shield plate. Patent applicant Nobuo Kinuya, patent attorney representing Ishikawajima W1 Ma Heavy Industries Co., Ltd. Figure 1

Claims (1)

[Claims] Platy materials to be heated are supplied in parallel on a moving beam and a fixed beam in the heating furnace, and the moving beams are moved upward, forward, downward, and backward to move the parallel heated materials and perform heat treatment. The method is characterized in that the opposite ends of the parallel materials to be heated are brought into close proximity and fed into the furnace, and the other end of the parallel materials to be heated is insulated with a heat shield plate before being moved. A method for preventing overheating of the edge of the heated material in a continuous heating furnace.