JP2000065482A - Manufacture of slab conveying roller and heat insulation sleeve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a service life of a conveying roller by suppressing and preventing release and drop of a heat insulator layer of a slab conveying roller having a tire and the layer axially alternately provided at a shaft material. SOLUTION: In the conveying roller as a forming member of a heat insulation layer covering a periphery of a shaft member 10, an annular space is formed by concentrically opposing an inside cylindrical wall 31a and an outside cylindrical wall 31b, and both ends of the space are formed with a structure in which a heat insulation sleeve 30 made of a heat resistant cast steel housing 31 blocked by a side wall 31c and a heat insulator 32 filled in the space is engaged with the member 10. The sleeve 30 is preferably manufactured as an insert cast unit for including the insulator 32 in a shell 31 made of a heat resistant alloy by applying a lost pattern mold process.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a thin slab conveying roller used in a heating furnace or the like in a continuous thin slab casting line or the like.

[0002]

2. Description of the Related Art A tunnel type heating furnace is installed between a thin slab continuous casting apparatus of an ironworks and a rolling facility, and a number of conveying rollers are disposed in the furnace. As shown in FIG. 6 (FIG. 7 is a cross-sectional view taken along line II of FIG. 6), the slab conveying roller has a structure in which tires (20) are fitted and fixed at a plurality of axial positions of a shaft member (10). Then, the transported slab (S) is carried on the peripheral surface of the tire (20) and transferred in the furnace. Since the inside of the furnace is controlled to a high-temperature atmosphere of about 1000 ° C. or more, the shaft member (10) of the roller has an internal water cooling structure, and the peripheral surface of the shaft member (10) is
It is configured so as to block the contact of the atmosphere in the furnace by coating in 4). The transport roller (1) is provided with a shaft member (1).
After fitting the tire (20) at a predetermined position in the axial direction of (0) and fixing it by welding or the like, a large number of V
It is manufactured by attaching a letter-shaped stud (33) by welding, then applying an insulated heat insulator such as castable to a predetermined layer thickness, and drying.

[0003]

The problem with the use of the above-mentioned conveying roller in actual use is that the heat insulating layer (34) comes into contact with a slab or a slab scale, peeling or falling off due to the action of vibration or impact. Is likely to occur. Insulation layer (3
If peeling or falling off occurs in 4), the effect of protecting the heat insulating material layer is impaired, and the oxidative wear and deformation of the shaft member (10) are accelerated, and the service life of the transport roller is shortened.
As a countermeasure, as shown in FIG.
It is conceivable to cover 4) with a sleeve (60) made of a heat-resistant steel plate. The sleeve (60) is a cylindrical member (61)
And a doughnut-shaped side plate (63), and a cylindrical member (6)
1) is put on the peripheral surface of the heat insulating material layer (33), and the side plate (6) is put on the side surface.
3) is welded to the edge of the applied cylindrical member (61) to complete the covering of the heat insulating material layer (34). However, the formation of the heat insulating material layer (34) (welding and fixing of a large number of V-shaped studs 33 to the shaft member and subsequent application of heat insulating material).
The operations such as drying) and subsequent assembly of the sleeve (60) are extremely complicated.

Further, when the tire (20) is fitted and fixed to the shaft member (10), the work of attaching the sleeve (60) to the heat insulating material layer (34) is hindered. Is smaller than the outer diameter of the tire, so that it cannot pass through the tire portion).
The work of forming the heat insulating material layer (34) and attaching the sleeve must be performed alternately. In this case, the complicated and time-consuming work of forming the heat insulating material layer (34) and mounting the sleeve (60) as described above makes the production of the transport roller (1) extremely inefficient. This also causes a significant increase in manufacturing costs. SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems relating to the manufacture of a transport roller provided with a sleeve enclosing a heat insulating material layer.

[0005]

According to the present invention, a shaft member (1) is provided.
0) A tire (20) is fitted and fixed at a plurality of locations in the axial direction, and a peripheral surface of the shaft member in a region other than the tire fitting portion is covered with a heat insulating material layer. As a member for forming a heat insulating layer covering the peripheral surface of (10), the inner cylindrical wall (31a) and the outer cylindrical wall (31b) face concentrically to define an annular space. A heat insulating sleeve (30) composed of a heat resistant steel housing (31) closed at both ends by a side wall (31c) and a heat insulating material (32) filled in the space is fitted to the shaft member (10). It has a structure.

The heat insulating sleeve (30) to be mounted on the shaft member (10) of the conveying roller of the present invention is preferably formed by applying a vanishing model casting method as described later, and heat insulating inside a shell made of a heat-resistant alloy. Manufactured as a cast-in body that embraces the material.

[0007]

1 and 2 show an embodiment of a conveying roller according to the present invention (FIG. 2 is a sectional view taken along the line II-II of FIG. 1).
Arrow cross section). As shown, the heat insulating sleeve (30) fitted to the shaft member (10) closes both ends of the inner cylindrical wall (31a) and the outer cylindrical wall (31b) and the annular space defined by both members. It comprises a housing (shell) consisting of a donut-shaped side wall (31c) and a heat insulating material (32) filled in the annular space. Also, if desired, V
A character stud (33) is formed.

[0008] A housing (shell) containing the heat insulating material (32).
As the material, heat-resistant steel (for example, SUS310S steel or the like) that can withstand the high-temperature environment in the furnace of the heating furnace is applied as its material. Further, as the heat insulating material (32), various ceramic heat insulating materials such as alumina, silica, zinc oxide and the like are appropriately employed in addition to various types of conventionally-known variable heat insulating materials such as castables.

As a method of manufacturing the heat insulating sleeve (30), for example, a small-diameter cylindrical member serving as an inner cylindrical wall (31a), a large-diameter cylindrical member serving as an outer cylindrical wall (31b), and a side wall (31c) are obtained. A donut board-like plate material is prepared as a constituent member of a housing (shell), and a heat insulating material (32) is loaded between a small-diameter cylindrical member and a large-diameter cylindrical member, thereby producing a welded structure.

As an alternative method of manufacturing the heat insulating sleeve (30), a lost form process (Lost Form Process) is used.
A method in which a heat-insulating material (32) is included in a shell made of a heat-resistant alloy and manufactured as a cast-in-place casting is preferably employed. This will be described with reference to FIGS. FIG. 4 shows a member configuration of a foam model formed of a foam material (foam polystyrene resin or the like). As shown, an inner cylindrical portion (41a) facing concentrically to form an annular space
A donut-shaped lid plate (41c) is bonded to one open end of the outer cylindrical portion (41b) with an adhesive to form a bottomed double cylindrical body. When forming a V-shaped stud or the like, a protruding piece member (foam member) corresponding to the stud shape
(43) is attached with an adhesive. The annular space (v) is filled with a heat insulating material (32), and then a lid plate (41c) is placed over the opening surface of the other end and bonded with an adhesive to form a foam model (40).

As shown in FIG. 5, the foam model (40) is buried in a casting sand (51) and a disappearing model mold (50) is formed.
Mold. By casting the heat-resistant alloy molten metal into this, the foamed model disappears due to the thermal action of the molten metal, and the space is filled with the molten metal to form a cast-in-mold casting in which the heat insulating material (32) is included. Is done. Finish machining is applied to the outer surface of the cast-in body to obtain a heat-insulating sleeve (30). The above-mentioned cast-in-place casting does not require any special conditions or restrictions, and a heat insulating material (32) is provided inside the foam model.
Can be carried out according to a conventional method except that the structure is filled with. According to this vanishing model casting method, the heat insulating sleeve (30) can be efficiently manufactured as a composite having a highly reliable shape and structure.

The transport roller according to the present invention comprises a shaft member (10).
The tire (20) is fitted and fixed to the center in the axial direction, and heat insulating sleeves (30) are mounted on both left and right sides thereof, and then the next tire (20) is fitted and fixed to each side. It is manufactured by sequentially repeating the operation outward in the axial direction. In this assembling operation of the transport roller, a complicated and time-consuming operation for forming the heat insulating material layer on the shaft member (10) and attaching the sleeve to the shaft member (10) as in the prior art is not required, and the heat insulating sleeve (30) is not required. Can be easily and quickly mounted on the shaft member (10).

The structure for fixing the heat-insulating sleeve (30) to the shaft member (10) is the same as the conventional one, such as a method of welding to the side of the adjacent tire (20) and a method of welding and fixing to the surface of the shaft member (10). May be employed. Alternatively, as shown in FIG. 3, a key (23) may be provided on the side of the tire (20) and a corresponding keyway (3) may be provided.
5) is formed on the side surface of the heat-insulating sleeve (30) so that both are engaged. In this case, at the fitting interface between the heat insulating sleeve (30) and the shaft member (10),
Appropriate clearance (c) can be provided, and the effect of suppressing and preventing the effect of thermal stress due to the difference in the coefficient of thermal expansion between them and the adverse effect thereof (the occurrence of crack damage or the like of the member) can be obtained. The tire (20) is, for example, a tire body (2
1) and a cradle (22).
2) is fixed to the shaft member (10) by welding. The structure of the tire (10) and the structure for fitting and fixing to the shaft member (10) are not different from those of the conventional tire.

[0014]

The transfer roller of the present invention has a structure in which the heat insulating material is covered and protected, so that the heat insulating material layer is less likely to be damaged by peeling and falling off, and stably retains the heat insulating protection function for the shaft member. The effect of improving the useful life of the transport roller can be obtained. Further, the transport roller of the present invention can be manufactured by a simple and efficient assembling operation of alternately fitting and fixing the tire and the heat insulating sleeve to the shaft member, and has a great effect on improvement of manufacturing efficiency and cost reduction. Things.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front sectional view showing an embodiment of a transport roller of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is an axial cross-sectional view showing another example of the fixing structure of the heat insulating sleeve in the transport roller of the present invention.

FIG. 4 is a perspective explanatory view showing a foam model for producing a heat-insulated sleeve of a transport roller of the present invention as a cast-in body.

FIG. 5 is a sectional view showing a vanishing model casting mold performed using the foam model of FIG. 4;

FIG. 6 is a partially cutaway front view showing a conventional transport roller.

FIG. 7 is a sectional view taken along the line II of FIG. 6;

FIG. 8 is an axial sectional view showing another example of the configuration of the heat insulating material layer of the conventional transport roller.

[Explanation of symbols]

 1: Conveying roller 10: Shaft member 20: Tire 21: Tire body 22: Tire support 23: Key 30: Heat-insulating sleeve 31: Heat-resistant alloy housing (shell) 31a: Inner cylindrical wall 31b: Outer cylindrical wall 31c: Side wall 32: Heat insulating material 33: Stud 34: Heat insulating material layer 35: Keyway 40: Foam model 41a: Inner cylindrical portion 41b: Outer cylindrical portion 41c: Side plate 50: Disappearing model 51: Foundry sand 60: Sleeve 61: Sleeve cylindrical member 63: sleeve side plate member

Claims (2)

[Claims] 1. A slab in which tires (20) are fitted and fixed at a plurality of positions in the axial direction of a shaft member (10), and a peripheral surface of the shaft member in a region other than a tire fitting portion is covered with a heat insulating material layer. In the conveying roller, as a member for forming a heat insulating layer covering the peripheral surface of the shaft member,
The inner cylindrical wall (31a) and the outer cylindrical wall (31b) concentrically face each other to define an annular space, and both ends of the annular space are closed by side walls (31c). A slab-conveying roller characterized in that a heat-insulating sleeve (30) comprising a housing (31) and a heat-insulating material (32) filled in the space is fitted on a shaft member (10). 2. A slab in which tires (20) are fitted and fixed at a plurality of positions in the axial direction of a shaft member (10), and a peripheral surface of the shaft member in a region other than a tire fitting portion is covered with a heat insulating material layer. The inner cylindrical wall (31a) and the outer cylindrical wall (31) fitted with the heat insulating layer on the peripheral surface of the shaft member of the transport roller as a forming member.
b) and a heat-resistant steel tubular housing (3) having a side wall (31c).
1) and heat insulating material (32) filled in the annular space
A method of manufacturing a heat insulating sleeve (30) comprising: an inner cylindrical portion (41a) and an outer cylindrical portion (41b) facing concentrically to form an annular space; A heat insulating material (32) is filled in the annular space of the foam model (40) composed of the plate-like side plate material (41c), buried in molding sand to form a vanishing model casting mold, and a heat-resistant cast steel molten metal is cast therein. A method of manufacturing a heat-insulating sleeve, which comprises replacing a foamed model with a cast metal.