JPS6135558Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a coil holder for an annealing furnace.More specifically, the invention relates to a coil holder for an annealing furnace, in which the contact surface with the coil is always maintained horizontally even when the coil is used repeatedly after being turned upside down. Regarding the stand.

Conventionally, a circular plate-shaped pedestal with parallel surfaces has been well known as a pedestal for supporting a cylindrical thin plate coil that is annealed in an annealing furnace to improve the mechanical properties of the material and give it workability. There is. However,
This type of coil holder supports the cylindrical thin steel plate coil with its central axis vertical, and when it is repeatedly annealed at a predetermined temperature, distortion due to heating is accumulated inside the holder, for example, As shown in Figure A, the upper surfaces 6a and 6b of the coil holder 6 curve, reaching the maximum allowable value of the material, and can no longer be used. Therefore, when reusing the coil holder, the curved coil is reversed and a newly annealed cylindrical thin steel coil is placed with the lower surface 6b facing upward and the upper surface 6a facing downward. It is annealed at a temperature of However, since the upper surface 6b of the coil holder immediately after being reversed is curved due to the previous strain, as shown in FIG. 1B, only the outer peripheral edge of the lower end surface of the cylindrical thin steel plate coil 10 is It comes into contact with the coil holder 6b, and the entire load of the coil 10 is concentrated on this part,
Distortion occurs inside the device, leaving a defective portion that must be removed eventually, resulting in a disadvantage in that it causes a decrease in yield.

The present invention was devised to solve the above-mentioned inconvenience, and its purpose is to ensure that the lower end surface of the coil is in contact with the upper surface of the coil holder over its entire surface even immediately after the coil holder is reversed. The load of the coil is evenly distributed over the entire lower end surface,
Therefore, it is an object of the present invention to provide a coil holder for an annealing furnace which can be used repeatedly by being turned over without causing any undue strain on the outer circumferential edge of the coil.

According to the present invention, the upper surface of the cradle that supports the coil in the annealing furnace is formed into a horizontal plane, and the lower surface thereof is formed with an inclined surface whose wall thickness gradually decreases from the inside to the outside. A coil cradle in an annealing furnace is obtained.

Hereinafter, one embodiment of the present invention will be described with reference to FIG.

FIG. 2 shows a cylindrical inner case 1 that covers the coil in the furnace and contains a protective atmosphere gas to prevent oxidation of the steel. The lower end of the inner case 1 is placed on sealing sand in the groove 3 of the base 2. A cylindrical support 4 having a predetermined height is fixed approximately at the center of the upper surface of the base 2. A predetermined number of ventilation holes 5 are bored in the side wall of the support base 4.

Reference numeral 6 denotes a coil holder for an annealing furnace according to the present invention, which is formed from a thick disk and has the cylindrical support 4 at its center.
A through hole 7 is bored which is approximately equal to the inner diameter of.
The outer diameter of the coil holder 6 is smaller than the inner diameter of the inner case 1, and a gap 8 is formed between the inner wall of the inner case 1 and the outer peripheral surface of the coil holder 6. Above coil holder 6
The upper surface 9 is formed into a horizontal plane, and a cylindrical steel plate coil 1 to be annealed is placed on this upper surface 9.
0 is placed with its central axis vertical. The lower surface of the coil holder 6 is comprised of a horizontal flat portion 11 that is supported by contacting the upper end surface of the cylindrical support 4, and an inclined surface 12 whose wall thickness gradually decreases from the inside to the outside. It's summery. The angle of inclination of this inclined surface 12 is determined from the actual amount of deflection and strength of the coil holder 6, and is preferably about 1/100, for example.

13 is a plurality of heaters arranged on the base,
The coil 10 is heated to a predetermined temperature by the heat source of the heater 13 and annealed.

Reference numeral 14 denotes an atmospheric gas supply pipe that passes through the cylindrical support base 4 and the through hole 7 and extends to approximately the center of the cylindrical coil 10. This supply pipe 14 contains a protective atmosphere that does not react with the steel. Gas is supplied.

Next, the usage condition of the coil holder 6 of the present invention will be explained.

First, when annealing the cylindrical thin plate coil 10, the coil 10 is placed on the coil holder 6 with its central axis vertical. In this state, the lower end surface of the cylindrical thin steel plate coil and the upper surface 9 of the coil holder 6 are in surface contact over the entire surface, and the entire load of the coil is uniformly distributed on the upper surface of the coil holder 6. Join 9.

When the temperature inside the inner case 1 is raised to a predetermined temperature by the heater 6 and a protective atmosphere gas is supplied from the atmosphere gas supply pipe 14, the coil 10 inside the inner case 1 is annealed for a predetermined period of time. When such annealing is repeated, the coil holder 6 becomes distorted internally due to the heating by the heater 13 and the load from the coil 10, and gradually curves downward, forming a shape on the lower surface of the coil holder 6. The inclined surface 12 gradually decreases its angle of inclination, and eventually changes to a horizontal surface continuous with the flat portion 11. On the other hand, the upper surface of the coil holder 6 has an outer surface gradually increasing the angle of inclination downward from the vicinity of the inner edge of the lower end of the cylindrical coil 10 to form an inclined surface similar to the inclined surface 12;
The upper and lower surfaces of the coil holder 6 used at the beginning have the opposite shape (that is, the upper surface has an inclined surface,
A horizontal surface is formed on the bottom surface. ) The annealing of the coil is completed, and a new inclined surface is formed on the upper surface of the coil holder 6 due to the thermal change as described above.
When the coil holder 6 is turned over when a horizontal plane is formed on the lower surface, the coil holder 6 will be in the same state as when it was first used. Next, the cylindrical thin plate coil 10 to be newly annealed is placed on the coil holder 6.
When the coil 10 is placed on the horizontal surface 9 of the cradle 6, the lower end surface of the coil 10 is in full contact with the horizontal surface 9 of the cradle 6 at the start of annealing, and the entire load of the coil 10 is uniformly applied to the horizontal surface 9, and the first coil cradle used It becomes the same state as 6, and is then repeatedly used in reverse.

As mentioned above, the present invention is a coil holder used when annealing the coil, and the upper surface of the coil holder is formed into a horizontal plane, and the lower surface of the coil holder is formed so that the wall thickness gradually increases from the inside to the outside. Since the surface is formed with a decreasing slope, when the coil is placed on the coil holder during annealing, the lower end surface of the coil is entirely in contact with the smooth upper surface of the coil holder.
Therefore, since the entire load of the coil is applied uniformly to the smooth top surface of the coil holder, there is no local internal distortion of the coil, and the coil holder angle is used repeatedly several times. Even if the coil holder is bent, by reversing it and using it, a horizontal smooth surface is formed on the top surface and an inclined surface whose thickness gradually decreases from the inside to the outside is formed on the bottom surface, making it easy to place the coil holder. The condition will be the same as that used in . Therefore, when the next coil to be annealed is placed on the coil holder, only the outer periphery of the lower end of the coil is supported in contact with the upper surface of the coil holder, as in the previous coil holder, and this part has local parts. This has the advantage that no physical distortion occurs, and therefore the yield of products does not decrease.

[Brief explanation of the drawing]

FIGS. 1A and 1B are schematic views showing how a conventional coil holder is used, and FIG. 2 is a side view showing an embodiment of a coil annealing furnace using the coil holder of the present invention. 1...Inner case, 2...Base, 3...
Groove, 4... Support stand, 6... Coil holder, 10...
... Coil, 12 ... Inclined surface, 13 ... Heater, 1
4... Atmosphere gas supply pipe.

Claims (1)

[Scope of utility model registration request] A coil holder for an annealing furnace that supports a coil in an annealing furnace, the upper surface of which is formed into a horizontal plane, and the lower surface of which is formed with an inclined surface whose wall thickness gradually decreases from the inside to the outside. The stand.