JPS638754Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an inner cover of a furnace, and more particularly, to an inner cover of a furnace that heats a coil to be annealed by applying a predetermined temperature gradient in the width direction thereof.

In the production of unidirectional silicon steel sheets, silicon steel sheets that have been cold-rolled to the product thickness are subjected to primary recrystallization annealing, and then subjected to final annealing in the temperature range of the primary recrystallization region and the secondary recrystallization region. Japanese Patent Application No. 56-20154 discloses a method for manufacturing a unidirectional silicon steel sheet having excellent high magnetic flux density characteristics by heating the steel sheet by applying a predetermined temperature gradient in the width direction to grow secondary recrystallized grains. Proposed.

By the way, in this heating method that creates a temperature gradient, the object to be heated or an inner cover placed over it is covered with a heat insulating material, and the portion of the covering is gradually changed in a high-temperature atmosphere to create a temperature gradient in the object to be heated. is causing However, in this heating method that uses an inner cover, since the inner cover is a single piece of metal, the heat applied to a portion is transmitted through the inner cover to the insulated part, resulting in a temperature gradient for the heated object. The effectiveness of heating may be hindered.

This idea is characterized by providing heat insulating partitions at intervals in the height direction of the inner cover, where a temperature gradient occurs in the inner cover, and suppressing the transmission of heat from partially heated areas to other areas. This relates to the inner cover of the furnace.

The present invention will be described in detail below based on embodiments with reference to the drawings.

FIG. 1 shows an inner cover with a heat insulating partition, in which A is a cylindrical inner cover and B is a hollow cylindrical inner cover. The side wall 1 is provided with heat insulating partitions 2 spaced apart in the height direction.
is made of heat-resistant metal and is a good thermal conductor.

The configuration of the heat insulating partition 2 will be described with reference to FIG. 2, which is shown in enlarged form. Thermal insulation partition 2 is the side wall 1-1
and 1-2, the ends of the side walls 1-1 and 1-2 are bent sideways into an L-shape as shown in Fig. It is constructed by inserting a heat insulating material 3. Reference numeral 4 denotes a connector, such as a bolt, which connects the ends of the side walls 1-1 and 1-2.

As shown in FIG. 2B, this heat insulating partition 2 is made by bending the end of only one side wall 1-2 into a step shape and inserting the above-mentioned heat insulating material 3 between it and the other side wall 1-1. may be configured. Alternatively, as shown in FIG. 2C, the heat insulating partition 2 can be constructed by winding a band-shaped heat insulating material 3 around the side wall 1 and locking it with a stopper 5.

Due to the presence of the heat insulating partition 2 as described above, for example, when the side wall 1-1 of the thermally good conductor is heated, the heat is not easily conducted to the next sidewall 1-2 of the thermally good conductor. .

FIG. 3 shows a case where the inner cover 6 with a heat insulating partition according to the present invention is placed over the coil 7 to be annealed and heated by applying a temperature gradient. In this figure, 8 is a furnace body, and 7 is a coil to be annealed, which is covered with an inner cover 6 with a heat insulating partition. 9 and 1
0 is a heat insulating cover and is raised and lowered by a hydraulic cylinder 11. 12 is a heating source for the furnace ceiling, and 13 is a heating source for the side walls.

The details of the range of the round frame G○ in this figure 3 are shown in the 4th figure.
It is shown in the figure and its operation will be explained.

In FIG. 4A, the top of the heat insulating cover 10 is at the level of the heat insulating partition 2-1 of the inner cover 6 with heat insulating partitions, and is heated by the furnace ceiling heating source 12 and side heating source 13 of the furnace body 8. . In this case, the inner cover 6 with heat insulating partitions is mainly 6-
1 is heated, and the heat is not easily conducted to the lower parts due to the action of the heat insulating partition 2-1 . Therefore, the coil 7 to be annealed is heated and becomes red-hot at the part 6- of the inner cover 6 with the heat-insulating partition.
The portion 7-1 corresponding to No. 1 is heated in an inclined manner. Next, B in FIG. 4 shows a state in which the heat insulating cover 10 has been lowered by one installation interval of the heat insulating partitions 2 . In this case as well, the portion 7-2 of the coil to be annealed 7 is also heated at an angle due to the same effect as shown in FIG. In this way, the coil 7 to be annealed is heated with a temperature gradient by the inner cover 6 with the heat insulating partition.

Note that in a temperature range where heating by providing a temperature gradient is not necessary, the heat insulating covers 9 and 10 are lowered.
In this case, the entire surface of the inner cover 6 with a heat insulating partition is heated by the furnace ceiling heat source 12 and the side wall heat source 13, so even if the heat insulating partition 2 is provided, the coil 7 to be annealed can be heated without any problem.

Further, in the above embodiment, a case was described in which a cylindrical inner cover with a heat insulating partition was used, but a hollow cylindrical inner cover with a heat insulating partition may be used depending on the object to be heated, which is indicated by B in Fig. 1. You can also do it.

[Brief explanation of the drawing]

Figures 1A and B are diagrams showing a specific example of an inner cover with a heat-insulating partition according to the present invention, Figures 2A, B, and C are enlarged views showing an example of the structure of the heat-insulating partition, and Figure 3 is a diagram according to the present invention. FIGS. 4A and 4B are diagrams showing a case where the coil to be annealed is heated by applying a temperature gradient using an inner cover with a heat insulating partition, and are diagrams for explaining the operation of the present invention. 1...Side wall, 2 ...Insulating partition, 3...Insulating material,
4... Connector, 6... Inner cover, 7... Coil, 8... Furnace body, 9, 10... Insulating cover, 1
1...Cylinder.

Claims (1)

[Scope of utility model registration request] An inner cover for a furnace that heat-treats an object by covering it over an object to be heated, characterized in that heat insulating partitions are provided around a side wall of the inner cover at intervals in the height direction of the side wall.