JPH10203628A - Multi-layer type tire roller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce thermal stress in a shape and structure, so that a tire disk and a tire roller can be manufactured by reducing a cost. SOLUTION: In a core metal 12 having a flow path of cooling medium in the inside, a tire disk 13 in contact with a conveyed object 16 of high temperature is mounted, the tire disk 13, in a diametric direction, is formed to be divided into a plurality of members, also each member, in a diametric direction, is laminated in multiplex, to be arranged to be fitted, a member 17 positioned in a peripheral side is formed of material whose thermal expansion coefficient is smaller than a thermal expansion coefficient of a member 18 positioned in an internal peripheral side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multilayer tire roller for transporting a high-temperature object such as a slab in a high-temperature atmosphere such as in a soaking furnace.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 2 to 4, in a high temperature (for example, 1200 ° C.) soaking furnace disposed on a steel sheet production line or the like, a plurality of tire rollers are used as a means for transporting the slab 1. 2 is used. This tire roller 2
Arranges a plurality of tire disks 4 on a cored bar 3,
A heat insulating material 5 is provided so as to cover the outer peripheral surface. The metal core 3 is made of carbon steel and has a water passage 6 for a cooling medium inside. The outer surface temperature is maintained at about 250 ° C. by a cooling action received from the cooling medium. The tire disk 4 uses high-grade heat-resistant steel to withstand thermal stress due to a large difference between the inside and outside temperatures of the tire roller 2 (about 900 ° C.).

[0003]

In the conventional construction described above, the amount of expansion due to thermal expansion occurring in the tire roller 2 is determined by the value of the slab at an inner peripheral side close to the cored bar 3 due to the temperature difference between the inside and outside. The value is smaller than the value of the portion on the outer peripheral side in contact with 1. As a result, the thermal stress generated in the tire disk 4 acts as a tensile stress on the inner peripheral side and acts as a compressive stress on the outer peripheral side, and a crack 7 is generated on the inner peripheral side where the stress is large, and the tire disk 4 is damaged. There was a problem.

[0004] For this purpose, studies have conventionally been made on the improvement of high-grade heat-resistant steel constituting the tire disk 4, and the high-grade heat-resistant steel having a strength capable of withstanding thermal stress due to an internal / external temperature difference (about 900 ° C.). I was aiming for development. However, it is difficult to increase the strength of the high-grade heat-resistant steel by improving the composition, and the developed high-grade heat-resistant steel naturally has a high cost. By the way, since the tire roller 2 is a mechanical part that can be moved in a high-temperature atmosphere, its position as a consumable that needs to be replaced in maintenance or the like remains unchanged even if its durability is improved. Mounting the used tire disc 4 on the tire roller 2 causes an increase in running cost.

The present invention has been made to solve the above-mentioned problems, and can reduce thermal stress in shape and structure.
It is an object of the present invention to provide a multilayer tire roller capable of manufacturing a tire disk and a tire roller at low cost.

[0006]

In order to solve the above-mentioned problems, a multi-layer type tire roller according to the present invention comprises a core disc having a cooling medium flow path inside, and a tire disc contacting a high-temperature conveyed object. Mounted, the tire disc is divided into a plurality of members in the radial direction, and each member is laminated and arranged in multiple layers in the radial direction, and the member located on the outer peripheral side has a thermal expansion coefficient Are formed of a material smaller than the coefficient of thermal expansion of the member located on the inner peripheral side.

With this configuration, when used at a high temperature, the temperature of the member located on the outer peripheral side is higher than that of the member located on the inner peripheral side, but the thermal expansion coefficient of the member located on the inner peripheral side is higher. Since the coefficient is smaller than the coefficient, the amount of extension of the inner peripheral length of the member located on the outer peripheral side is substantially equal to the amount of extension of the member located on the inner peripheral side, and the fitted state can be maintained while suppressing the generation of thermal stress.

Further, a member located on the outer peripheral side, a member located on the inner peripheral side, a member located on the inner peripheral side, and the core are fitted and mounted by shrink fitting or cold fitting. . With this configuration, the pressing force between the opposing contact surfaces of both members can maintain the same value in the high temperature state and the normal temperature state during use.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, a multilayer tire roller 11 is used in a high-temperature atmosphere such as a soaking furnace, and a plurality of tire disks 13 are mounted on a cored bar 12.
The outer peripheral surface of the cored bar 12 is covered with a heat insulating material 14. The cored bar 12 has a hollow shape and has a channel 15 through which a cooling medium such as cooling water flows, and the tire disc 13 is in contact with a conveyed object 16 such as a high-temperature slab.

The tire disk 13 is divided into a plurality of members in the radial direction, and each member of the outer roll 17 and the inner roll 18 is laminated and fitted in multiple layers in the radial direction. The outer peripheral roll 17 located is
The thermal expansion coefficient is smaller than the thermal expansion coefficient of the inner roll 18 located on the inner peripheral side. The outer peripheral roll 17 is located farthest from the metal core 12 through which the cooling medium flows, and forms an outer layer that comes into contact with the conveyed object 16. The inner roll 18 forms an inner layer that is in contact with the metal core 12, and is generally formed of heat-resistant steel. Outer roll 17 and inner roll 18
The inner roll 18 and the metal core 12 are fitted and fitted by shrink fitting or cold fitting.

With this configuration, a discontinuous portion exists between the opposing surfaces of the outer roll 17 and the inner roll 18 that are radially adjacent to each other, and the thermal stress generated in each of the outer roll 17 and the inner roll 18 influences each other. do not do. When used at a high temperature, the outer roll 17 positioned on the outer circumference has a higher temperature than the inner roll 18 positioned on the inner circumference, but the thermal expansion coefficient of the inner roll 18 positioned on the inner circumference is higher. Since it is smaller, the amount of extension of the inner peripheral length of the member located on the outer peripheral side is substantially equal to the amount of extension of the member located on the inner peripheral side, and the fitted state can be maintained while suppressing the generation of thermal stress. The pressing force between the opposing contact surfaces of the outer roll 17 and the inner roll 18 can maintain the same value in a high temperature state and a normal temperature state during use. The same applies to the space between the member located on the inner surface side and the core metal.

[0012]

As described above, according to the present invention, it is possible to reduce the thickness of the member forming the outer layer in the radial direction, thereby reducing the amount of high-grade materials used and reducing costs. be able to. Furthermore, thermal stress is reduced, and damage can be prevented, and a low-grade material can be used with a small design allowable stress. The amount of extension of the inner peripheral length of the member located on the outer peripheral side is substantially equal to the amount of extension of the member located on the inner periphery, so that the mating state can be maintained while suppressing the generation of thermal stress. The pressing force between them can maintain the same value in the high temperature state and the normal temperature state during use.

[Brief description of the drawings]

FIG. 1 is a front view showing a multilayer tire roller according to an embodiment of the present invention.

FIG. 2 is a schematic view showing the arrangement of a conventional tire roller.

FIG. 3 is a front view of the tire roller.

FIG. 4 is a front view of a conventional tire disk.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Multilayer type tire roller 12 Core metal 13 Tire disk 17 Outer roll 18 Inner roll

Continuation of the front page (72) Inventor Masamichi Hino 1-1-1, Hama, Amagasaki-shi, Hyogo Prefecture Inside the Kubota Analysis Technology Center Co., Ltd. (72) Inventor Shinozaki ▲ Akira ▼ 1-1-1, Hama, Amagasaki-shi, Hyogo Kubota Corporation Analysis Technology Center (72) Inventor Yasuhiko Horibe 1-1-1 Hama, Amagasaki City, Hyogo Prefecture Kubota Analysis Technology Center Co., Ltd.

Claims (2)

[Claims] 1. A core having a cooling medium flow path therein,
A tire disk that comes in contact with a high-temperature conveyed object is mounted, and the tire disk is divided into a plurality of members in a radial direction, and each member is stacked in a radially multiple manner and fitted and arranged. Wherein the member located at the position (1) is formed of a material whose coefficient of thermal expansion is smaller than that of the member located at the inner peripheral side. 2. A multi-layer tire roller according to claim 1, wherein the member located on the outer peripheral side and the member located on the inner peripheral side are fitted and fitted by shrink fitting or cold fitting. .