JPH11257873A - Low frequency induction heating furnace lining method for hot extrusion billet and its furnace wall structure - Google Patents

Abstract

(57) [Summary] [Problem] To prevent welding of a guide plate to a billet and biting of a brick, to prevent occurrence of a product defect, and
Provided is a low-frequency induction heating lining method for a hot extruded billet capable of improving heat conduction, preventing radiation from an outer surface, and reducing power consumption, and a furnace wall structure thereof. SOLUTION: An adhesive is applied to an innermost wall of a low-frequency induction heating coil used for heating a billet for hot extrusion, a paper-like ceramic fiber is attached thereon, and an adhesive is further applied thereon. A low frequency induction heating lining method for a hot extruded billet, characterized by applying a paste-like ceramic fiber, and a furnace wall structure thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a coil lining method for a low-frequency induction heating furnace for heating a hot extruded billet and a furnace wall structure thereof.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, a low frequency induction heating furnace for a hot extrusion billet has a billet 1 for hot tube extrusion.
A lower part of the induction heating coil 2 is inserted upward by a cylinder 4 through a flux diverter 3 and is introduced into the induction heating coil 1 from upper and lower taps 5, for example, 60HZ.
It is configured to flow a current of 190 to 372V 6060A. Under such a configuration, the induction heating coil 2
As a result, an induced current flows through the dielectric billet 1 inside the induction heating coil 2 so that the billet 1 is heated by the Joule heat. Further, the inside of the induction heating coil 2 becomes high temperature due to billet heating, which has a bad influence on heat of the induction heating coil 2. Then, in order to reduce the heat influence on the coil 2 and the insulation between the induction heating coil 2 and the billet 1, the influence is reduced via the refractory brick 6 between the induction heating coil 2 and the billet 1.

[0003] Regarding the construction method of the refractory brick 6,
It is explained here. The induction heating coil 2 is turned sideways, and the inside of the induction heating coil 2 is coated with a refractory brick 6 previously kneaded with water on a half surface (lower side) of the induction heating coil 2. After the half of the brick 6 is dried, the brick 6 is applied to the half of the induction heating coil 2 where the brick 6 is not applied. Thereafter, a guide plate 7 is attached to the inside of the brick 6 in order to prevent the billet 1 from being rubbed.

[0004]

As described above, refractory bricks are used for the inner wall of the conventional induction heating coil. However, the refractory bricks are liable to crack due to thermal expansion or the like. The scale and iron powder accumulated in the part, the current leaked from the coil sparked into the billet, and the guide plate between the refractory brick and the billet was welded to the billet, leading to product failure. Also, when inserting a billet,
The billet slips into the gaps between the refractory bricks that are not protected by the guide plate and the bricks slip off, and the pieces bite into the billet, which also adversely affects product quality. Further, originally, there were various problems that a low-frequency induction heating furnace had a high power consumption rate, and a current refractory brick had a high thermal conductivity, resulting in a heating energy loss.

The problem to be solved by the present invention is to prevent the welding of the guide plate to the billet and the biting of the brick, which are problems in the conventional lining method as described above, to prevent the occurrence of defective products, and A low frequency induction heating lining method for a hot extruded billet capable of improving heat conduction, preventing heat radiation from an outer surface, and reducing power consumption, and a furnace wall structure thereof.

[0006]

The gist of the present invention is as follows: (1) An adhesive is applied to the innermost wall of a low-frequency induction heating coil used for heating a billet for hot extrusion, and a paper-like adhesive is applied thereon. A low frequency induction heating furnace lining method for a hot extruded billet, which comprises attaching a ceramic fiber, further applying an adhesive thereon, and attaching a clay-like ceramic fiber. (2) In a furnace wall structure of a low-frequency induction heating furnace used for heating a billet for hot extrusion, a two-layer lining in which paper-like and paste-like ceramic fibers are attached to an induction heating heating coil via an adhesive. The low-frequency induction heating furnace for hot extruded billets is characterized in that the furnace wall structure is constituted.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is an overall schematic diagram of a lining method according to the present invention. As shown in FIG. 1, an FF adhesive 10 is applied on the induction heating coil 2, and a ceramic fiber 8 formed by adding a small amount of an organic binder to a bulk fiber is adhered on the upper surface thereof. Further, an FF adhesive 10 is applied to the upper surface, and then a paste-like ceramic fiber 9 obtained by wet-mixing a ceramic fiber and an inorganic binder is applied. After the paste-like cellami fibers 9 were dried, the guide plate 7 was inserted between the billet 1 and the ceramic fibers 9 to protect the lining from rubbing of the billet 1 and the like.

[0008] As described above, a ceramic fiber material which has a low thermal conductivity and is harmless to products even when peeled off is applied, and a sheet-like ceramic fiber having heat resistance, abrasion resistance and high thermal shock resistance is used. By having a layer structure, biting into the product due to welding of the guide plate and peeling of the bricks was prevented, and the power consumption per unit was reduced due to the heat insulation.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to embodiments. FIG. 2 is a detailed view of the lining according to the present invention. As shown in FIG. 2, an FF adhesive 10 is applied to the innermost wall of the induction heating coil 2 with a thickness of 0.5 to 1.0 mm over the entire inner wall of the coil. Thereafter, a paper-like ceramic fiber 8 having a thickness of 1 to 3 mm is attached. Further, the FF adhesive 10 is applied to the paper-like ceramic fiber 8 in a thickness of 0.1.
The whole is applied with a thickness of 5 to 1.0 mm, and the paste-like ceramic fiber 9 is applied with a thickness of 8 to 12 mm. Thereafter, a guide plate 7 of SUS310S having a thickness of 1.5 to 2.0 mm was attached between the paste-like ceramic fiber 9 and the billet 1 by a guide plate fixing bolt on the upper surface of the induction heating coil.

Table 1 shows the effect on the product quality after the billet is heated by using the low-frequency induction heating furnace for the hot extruded billet having such a structure. Table 2 also shows the power consumption at the same time. As a result, as shown in Table 1, the present invention has significantly less plate welding and brick entrapment as compared with the conventional one. As a result, it is understood that the heat conduction is low and the power consumption is low.

[0011]

[Table 1]

[0012]

[Table 2]

[0013]

As described above, the lining of the heating coil according to the present invention can be used at a high temperature and has excellent thermal shock resistance and flakes of the lining material are harmless to the product quality by using ceramic fibers. It is possible to prevent bites into the product due to welding of the guide plate and peeling of the brick. In addition, it is excellent in heat insulation and can contribute to reduction of the power consumption rate, and has an extremely excellent effect.

[Brief description of the drawings]

FIG. 1 is an overall schematic diagram of a lining method embodying the present invention.

FIG. 2 is a detailed view of a lining embodying the present invention.

FIG. 3 is an overall schematic view of a conventional lining method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Billet 2 Induction heating coil 3 Flux diverter 4 Cylinder 5 Upper and lower tap 6 Refractory brick 7 Guide plate 8 Paper-like ceramic fiber 9 Paste-like ceramic fiber 10 FF adhesive

Claims (2)

[Claims] 1. An adhesive is applied to the innermost wall of a low-frequency induction heating coil used for heating a billet for hot extrusion, a paper-like ceramic fiber is adhered thereon, and an adhesive is further applied thereon. A low frequency induction heating furnace lining method for hot extruded billets, wherein a paste-like ceramic fiber is attached. 2. A low-frequency induction heating furnace wall structure used for heating a billet for hot extrusion, comprising a two-layer structure in which paper and paste ceramic fibers are bonded to an induction heating coil via an adhesive. A furnace wall structure of a low-frequency induction heating furnace for a hot extruded billet, which is constituted by a lining.