Long-life roller for heat treatment furnace and heat treatment furnace

Abstract

To provide a long-life roller for a heat treatment furnace for conveying a component to be heat-treated or a conveying member on which the component to be heat-treated is placed in the heat treatment furnace, and to provide the heat treatment furnace.SOLUTION: The deformation suppressing member 5 is inserted into the hollow steel material 1 and abuts on an inner surface 1b of the hollow steel material 1, and the cross-sectional shape orthogonal to the longitudinal direction of the deformation suppressing member 5 is a cross shape, a star shape (with three to six apexes), a polygonal shape (three to eight sides), or a circular shape (circle, ellipse). In this case, the deformation inhibiting member 5 is preferably made of the same or similar material as the hollow steel material 1 or a carbon-based composite material (CC composite member). A positioning member 6 for arranging the deformation restraining member 5 only in a central area R1 in the hollow steel product 1, is preferably arranged in the same length L3 and L4 on both sides of the deformation restraining member 5.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a long-life roller for a heat treatment furnace and a heat treatment furnace. More specifically, the present invention relates to a long-life roller for a heat treatment furnace, which is used to transport a part to be heat-treated or a transport member carrying the part to be heat-treated within a heat treatment furnace for heat-treating the part, and a heat treatment furnace equipped with the roller for a heat treatment furnace. [Background technology]

[0002] Some heat treatment furnaces for heat treating parts that require heat treatment (referred to as "workpieces to be heat treated") are equipped with a conveying device for continuously and repeatedly conveying the workpieces to be heat treated. Known examples of such conveying devices include those in which a plurality of conveying rollers (also simply referred to as "rollers" in this application) are arranged side by side (e.g., Patent Document 1), and those in which a plurality of rollers that feed a conveyor belt are arranged side by side (e.g., Patent Document 2).

[0003] Because conveying devices are repeatedly exposed to the heat treatment environment in a heat treatment furnace, they require heat resistance to prevent thermal degradation and thermal deformation. In particular, since the conveying rollers come into contact with the parts to be heat treated directly or indirectly via a conveyor belt, thermal deformation can cause the parts to rattle during transport. Therefore, conveying rollers with good heat resistance and durability are required.

[0004] Regarding transport rollers, for example, Patent Document 3 proposes a carbon-based composite roller, which, instead of conventional rollers made of carbon powder, stainless steel, or C / C composites, has a base made of a carbon-based material, a protective layer that prevents penetration of silicon components, and a surface layer made of a silicon-containing carbon-based material, arranged in that order. This carbon-based composite roller has an improved laminated structure, where the protective layer prevents the silicon in the surface layer from reacting with the C / C composite core, resulting in a deterioration in properties. Furthermore, Patent Document 4, for example, proposes a technology that improves the contact points of the transport roller with the transport tray and the contact points of the transport tray with the workpiece to solve the problems of welding and carburization between the transport roller made of a carbon-based composite material and the transport tray, and between the transport tray made of a carbon-based composite material and the workpiece. The contact points are coated with an yttrium oxide coating, which has excellent wear resistance, heat resistance, and chemical and physical stability at high temperatures. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-209060 [Patent Document 2] Japanese Patent Application Publication No. 5-118765 [Patent Document 3] Japanese Patent Application Laid-Open No. 2002-274985 [Patent Document 4] Japanese Patent Application Laid-Open No. 2003-213323 Summary of the Invention [Problem to be solved by the invention]

[0006] The transport rollers in Patent Documents 3 and 4 aim to improve heat resistance and durability by preventing reactions with carbon and carburization of carbon when using a heat-resistant carbon-based composite material, but these technologies involve providing one or more characteristic functional layers on the carbon-based composite material, which makes manufacturing highly advanced and complicated, and has the drawback of being costly. In particular, since the transport rollers come into contact with the parts to be heat-treated directly or indirectly via a conveyor belt, bending due to thermal deformation can cause the parts to rattle during transport. Therefore, the transport rollers must be replaced regularly before they become deformed. However, a heat treatment factory has many heat treatment furnaces, and each heat treatment furnace is equipped with a large number of transport rollers, which significantly increases costs.

[0007] In typical heat treatment furnaces, expensive carbon composite rollers cannot be used, so measures to prevent bending are taken, such as increasing the thickness of the rollers or changing the roller material to heat-resistant steel. However, increasing the thickness makes the rollers heavier, which increases the mass inside the furnace and increases the time it takes to heat up, resulting in poor fuel efficiency and an increase in price. Furthermore, changing to heat-resistant steel significantly increases the price.

[0008] The present invention has been made to solve the above-mentioned problems, and its object is to provide a long-life roller for a heat treatment furnace and a heat treatment furnace for transporting a part to be heat treated or a transport member carrying the part to be heat treated within the heat treatment furnace. [Means for solving the problem]

[0009] (1) The roller for a heat treatment furnace according to the present invention is at least composed of a hollow steel material and a deformation suppression member that is inserted into the hollow steel material and contacts the inner surface of the hollow steel material, and is characterized in that the cross-sectional shape of the deformation suppression member perpendicular to the longitudinal direction is cross-shaped, star-shaped, angular, or circular.

[0010] According to this invention, a deformation suppression member is inserted into the inner surface of the hollow steel material, and the cross-sectional shape of the deformation suppression member perpendicular to the longitudinal direction is a cross, star (star-shaped with 3 to 6 apexes), polygonal (triangular to octagonal), or circular (circular, elliptical) shape. This suppresses deformation of the hollow steel material that forms the roller portion of the heat treatment furnace rollers that are repeatedly used in the heat treatment furnace. As a result, the period during which heat-treated parts can be stably transported without rattle can be extended, the period between regular replacement of the heat treatment furnace rollers can be extended, and it is also advantageous in terms of cost. Note that the "hollow steel material" refers to the member that forms the roller portion of the heat treatment furnace roller, other than the end members provided on both ends of the heat treatment furnace roller, and is a hollow pipe portion with the same outer and inner diameters in the longitudinal direction. This hollow steel material is preferably a drawn cast pipe.

[0011] In the roller for a heat treatment furnace according to the present invention, the deformation suppression member is made of the same or similar material as the hollow steel material. According to this invention, even if the deformation suppression member is made of the same or similar material as the hollow steel material, by inserting it as a separate member into the inner surface of the hollow steel material, deformation of the hollow steel material can be suppressed more effectively than if no deformation suppression member is inserted.

[0012] In the roller for a heat treatment furnace according to the present invention, the deformation suppression member is made of a carbon-based composite material (CC composite member) that has good thermal deformation resistance, so deformation of the hollow steel material can be effectively suppressed.

[0013] In the roller for a heat treatment furnace according to the present invention, positioning members for positioning the deformation suppression member only in the central region of the hollow steel material are arranged on both sides of the deformation suppression member with the same length. According to this invention, since the positioning members for positioning the deformation suppression member only in the central region of the hollow steel material are arranged on both sides of the deformation suppression member with the same length, it is advantageous for suppressing deformation at the center of the hollow steel material. Note that the material of such positioning members is not particularly limited, but from a cost perspective it is preferable that they be the same or of the same type as the hollow steel material.

[0014] In the roller for a heat treatment furnace according to the present invention, the positioning member is composed of at least a center shaft and circular plates provided at both ends of the center shaft. According to this invention, the circular plates provided at both ends of the center shaft enable the deformation suppression member to be stably positioned only in the central region within the hollow steel material. Note that a heat insulating material may be provided in the positioning member placement region.

[0015] In the roller for heat treatment furnace according to the present invention, the positioning member includes a partition plate in addition to the circular plate, and a heat insulating material is inserted between the partition plate and the end. The positioning member and its arrangement position are as described above, but in this invention, a partition plate is further provided in the longitudinal direction, and a heat insulating material is inserted between the partition plate and the end. This suppresses heat transfer to the bearing part that supports the roller for heat treatment furnace, and also suppresses thermal deformation of the positioning member.

[0016] (2) A heat treatment furnace according to the present invention includes the heat treatment furnace roller according to the present invention as a transport roller. [Effects of the Invention]

[0017] According to the present invention, it is possible to provide a roller for a heat treatment furnace having a long life, and a heat treatment furnace for transporting a part to be heat treated or a transport member carrying the part to be heat treated within the heat treatment furnace. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a schematic diagram showing an example of a heat treatment furnace equipped with a roller for a heat treatment furnace according to the present invention as a transport roller. [Figure 2] 1 is an overall view showing an example of a roller for a heat treatment furnace according to the present invention. FIG. [Figure 3] 10 shows examples of cross-sectional shapes of deformation suppressing members. (A) is an example of a cross shape, (B) is an example of a star shape with three points, and (C) is an example of a star shape with four points. [Figure 4] Other examples of the cross-sectional shape of the deformation suppressing member are shown: (A) an example of a triangular shape, (B) an example of a hexagonal shape, (C) an example of a circular shape, and (D) an example of an elliptical shape. [Figure 5] 1A and 1B are diagrams showing an example of a deformation suppressing member, in which (A) is a front view, (B) is an example of a side view, and (C) is another example of a side view. [Figure 6] FIG. 10 is a schematic perspective view showing an example in which a deformation suppressing member is inserted into a hollow steel material. [Figure 7] 1A and 1B are enlarged views showing examples of both sides of a roller for a heat treatment furnace according to the present invention, in which (A) is an example in which a positioning member is arranged, (B) is an example in which a positioning member provided with a partition plate is arranged, and (C) is an example in which a heat insulating material is inserted on the end side of the partition plate of (B). DETAILED DESCRIPTION OF THE INVENTION

[0019] The long-life roller for a heat treatment furnace and the heat treatment structure according to the present invention will be described below with reference to the drawings. Note that the present invention is not limited to the following embodiments.

[0020] [Heat treatment furnace rollers, heat treatment furnaces] As shown in Figs. 1 to 7, a roller 10 for a heat treatment furnace according to the present invention is a long-life roller 10 for a heat treatment furnace used to transport a part to be heat treated 21 or a transport member on which the part to be heat treated 21 is placed or hung, within a heat treatment furnace 20. The roller 10 for a heat treatment furnace according to the present invention is composed of at least a hollow steel material 1 and a deformation suppressing member 5 that is inserted into the hollow steel material 1 and contacts the inner surface 1b of the hollow steel material 1, and the deformation suppressing member 5 is characterized in that its cross-sectional shape perpendicular to the longitudinal direction Y is a cross, a star (a star with three to six apexes), a polygonal shape (a trigonal to octagonal shape), or a circle (circular, elliptical). The heat treatment furnace according to the present invention is equipped with such a roller for a heat treatment furnace as a transport roller.

[0021] In this heat treatment furnace roller 10, a deformation suppression member 5 is inserted into the inner surface 1b of the hollow steel material 1, and the cross-sectional shape of the deformation suppression member 5 perpendicular to the longitudinal direction Y is a cross, square, three-star, triangular, or circular shape, which can suppress deformation of the hollow steel material 1 that forms the roller portion of the heat treatment furnace roller 10 that is used repeatedly in the heat treatment furnace 20. As a result, the period during which the parts to be heat treated 21 can be transported stably without rattle can be extended, the periodic replacement interval of the heat treatment furnace roller 10 can be extended, and it is also advantageous in terms of cost.

[0022] Each component will be described below.

[0023] <Heat treatment furnace> As shown in FIG. 1 , the heat treatment furnace 20 according to the present invention includes a heat treatment furnace roller 10 according to the present invention for transporting a heat treatment target part 21 or a transport member on which the heat treatment target part 21 is placed or hung. The configuration shown in FIG. 1 is not limited to that shown in FIG. 1 , as long as the device performs heat treatment during transport. The heat treatment furnace 20 includes a furnace entrance 23 through which the heat treatment target part 21 enters the heat treatment region 22, a heat treatment region 22 in which the heat treatment target part 21 is transported while being heat-treated, and a furnace exit 24 through which the heat-treated target part 21 exits the heat treatment region, all of which are arranged along the transport path. While the heat treatment region 22 shown in FIG. 1 includes three heat treatment regions 22a, 22b, and 22c, the number of heat treatment regions 22 may be one or more, and is not limited to three. Note that other components and control devices similar to those of a typical heat treatment furnace may be applied.

[0024] <Heat treatment furnace rollers> 1 and 2, a roller 10 for a heat treatment furnace according to the present invention is a roller for transporting a part to be heat treated 21 or a transport member on which the part to be heat treated 21 is placed or hung, within a heat treatment furnace 20. Such a roller 10 for a heat treatment furnace is composed of at least a hollow steel material 1 and end members 2 connected to both end portions of the hollow steel material 1, as shown in FIG.

[0025] (Hollow steel materials, end members) The hollow steel material 1 is a member that performs the roller portion of the heat treatment furnace roller 10 and is a member other than the end members 2 provided on both ends of the heat treatment furnace roller 10. The hollow steel material 1 is a hollow pipe portion whose outer and inner diameters are the same in the longitudinal direction Y. The material of the hollow steel material 1 is not particularly limited as long as it is a material commonly used for heat treatment furnace rollers 10 (e.g., steel or Ni alloy material, etc.), but it may also be a steel material with high heat resistance and heat resistance strength, such as tungsten steel or titanium steel. The outer and inner diameters of the hollow steel material 1 are arbitrarily selected depending on the weight and size of the heat treatment target part 21 to be transported in the applicable heat treatment furnace 20, and any outer and inner diameters commonly used for heat treatment furnace rollers 10 can be selected and used. In the illustrated example, an inner diameter of approximately 50 to 60 mm is used as an example, but this is not limiting. Such a hollow steel material 1 is preferably a drawn cast pipe. In FIG. 2, the symbol L1 denotes the length of the hollow steel material 1 in the longitudinal direction Y.

[0026] The end members 2 are provided on both ends of the roller 10 for a heat treatment furnace, and are attached to bearing portions (not shown) that support the roller 10 for a heat treatment furnace. The structural form of the end members 2 is not particularly limited, but as shown in Figures 2 and 3, an example is one that is attached to the hollow steel material 1 by welding or the like as a separate member with a step that is attached to the bearing portion. The end members 2 on both sides of the hollow steel material 1 may have the same structural form, or may have different structural forms.

[0027] (deformation suppression member) As shown in Figures 2 and 3, the deformation suppression member 5 is inserted into the hollow steel material 1 and abuts against its inner surface 1b. By inserting the deformation suppression member 5 so that it abuts against the inner surface 1b of the hollow steel material 1, deformation of the hollow steel material can be more effectively suppressed than when the deformation suppression member 5 is not inserted. This suppresses deformation of the hollow steel material 1, which forms the roller portion of the heat treatment furnace rollers 10 that are used repeatedly in the heat treatment furnace 20. As a result, the period during which the parts to be heat treated 21 can be transported stably without rattle can be extended, the period between regular replacement of the heat treatment furnace rollers 10 can be extended, and there are also cost advantages.

[0028] As shown in Figures 3 and 4, the cross section of the deformation suppressing member 5 perpendicular to the longitudinal direction Y is preferably a cross, a star (specifically, a star with 3 to 6 apexes), a polygon (specifically, a triangular to octagonal), or a circle (specifically, a circle or an ellipse). Figure 3(A) shows an example of a cross shape with four evenly spaced apexes 5a that correspond to the inner surface 1b of the hollow steel material 1, Figure 3(B) shows an example of a star shape with three evenly spaced apexes 5a that correspond to the inner surface 1b of the hollow steel material 1, and Figure 3(C) shows an example of a star shape with four evenly spaced apexes 5a that correspond to the inner surface 1b of the hollow steel material 1. Furthermore, Figure 4(A) is an example of a triangular shape in which three vertices 5a that contact the inner surface 1b of the hollow steel material 1 are evenly arranged, Figure 4(B) is an example of a hexagonal shape in which six vertices 5a that contact the inner surface 1b of the hollow steel material 1 are evenly arranged, Figure 4(C) is an example of a perfect circular shape in which the outer peripheral surface 5d partially contacts the inner surface 1b of the hollow steel material 1, and Figure 4(D) is an example of an elliptical shape in which the outer peripheral surface 5d partially contacts the inner surface 1b of the hollow steel material 1.

[0029] In deformation suppressing members 5 having star-shaped and angular cross sections, the number of apexes 5a of the star-shaped and angular shapes may be three or four, or may be five to eight. As shown in FIGS. 3 and 4, the apexes 5a are preferably arranged at equal positions with respect to the center 5c, and have the same apex shape. In FIGS. 3 and 4, reference numeral 5b denotes a valley other than the apexes, and reference numeral 5c denotes the center (also referred to as the central axis) of the deformation suppressing member 5. FIG. 5 shows an example of the cross-shaped deformation suppressing member 5 shown in FIG. 3(A). FIG. 5(A) is a front view of the example, FIG. 5(B) is a side view of an example in which the apexes 5a extend straight along the central axis, and FIG. 5(C) is a side view of an example in which the apexes 5a spiral around the central axis. The spiral spiral configuration shown in FIG. 5(C) can also be preferably applied to the deformation suppressing members 5 shown in FIGS. 3(B) and 3(C).

[0030] In the deformation suppression member 5 having a circular cross section, the "circular shape" may be a perfect circle as shown in FIG. 4(C) or an elliptical shape as shown in FIG. 4(D). The terms "perfect circle shape" and "elliptical shape" include not only geometric perfect circles and ellipses, but also nearly perfect circles and nearly ellipses. In FIG. 4, the reference symbol 5d indicates the outer peripheral surface that abuts against the inner surface 1b of the hollow steel material 1. In the perfect circular deformation suppression member 5 of FIG. 4(C), a portion of the outer peripheral surface 5d abuts against the inner surface 1b of the hollow steel material 1, while in the elliptical deformation suppression member 5 of FIG. 4(D), the outer peripheral surface 5d abuts against the inner surface 1b of the hollow steel material 1. The spirally spiraling shape shown in FIG. 5(C) can also be preferably applied to the angular deformation suppression member 5 shown in FIGS. 4(A) and 4(B) and the elliptical deformation suppression member 5 shown in FIG. 4(D).

[0031] The material of the deformation suppression member 5 is preferably the same or similar material as that of the hollow steel material 1, or a carbon-based composite material (also referred to as a CC composite member). By inserting the deformation suppression member 5 made of the same or similar material (e.g., steel or Ni alloy material) as the hollow steel material 1 as a separate member, deformation of the hollow steel material 1 can be more effectively suppressed than when the thickness of the hollow steel material 1 is increased to suppress deformation or when no deformation suppression member 5 is inserted. Furthermore, since the material is the same or similar to that of the hollow steel material 1, it is advantageous in terms of cost. Note that the method for producing the deformation suppression member 5 made of steel or Ni alloy material is not particularly limited, but a preferred example is production by the lost wax method.

[0032] Specific examples of materials include nickel-containing steels such as austenitic stainless steel and heat-resistant cast steel, and high-Ni alloys such as Inconel. These steels and Ni alloys have excellent high-temperature strength and high-temperature oxidation resistance, making them suitable for use as the deformation suppressing member 5, which is repeatedly fed into a heat treatment furnace. The deformation suppressing member 5 may contain various other elements, as long as the effects of the present invention are not impaired. The deformation suppressing member 5 may also be hardened or surface-modified after fabrication. The lost-wax casting method has the advantage of being able to fabricate complex shapes with high accuracy and low cost, thereby achieving low-cost production of complex structures such as the deformation suppressing member 5 with the cross-sectional shape described above. The lost-wax casting method involves creating a mold out of wax, covering the mold with casting sand or plaster, and then heating the mold to melt and remove the wax. Molten steel is then poured into the resulting cavity to obtain a casting with the same shape as the mold.

[0033] Carbon-based composite materials (CC composite members) are more heat-resistant and less susceptible to thermal deformation than metallic materials, making them preferable for use as the constituent material of the deformation suppression member 5, which is exposed to repeated heat treatments over a long period of time. Carbon composite materials are heat-resistant enough to be used at temperatures of around 2200°C, and are therefore unaffected by heat treatment temperatures of, for example, about 950°C to about 1200°C. Although carbon composite materials are more expensive than steel materials, their use as the deformation suppression member 5 in the present invention extends the replacement interval for the heat treatment furnace rollers 10, resulting in significant cost savings in terms of total costs.

[0034] Various carbon composite materials can be used. High-strength, highly elastic carbon materials reinforced with carbon fibers are preferred. Particularly preferred are those in which carbon fibers are composited as reinforcing fibers in a carbon matrix such as graphite. Longer carbon fibers are preferred than shorter ones, and those with a regular arrangement in the matrix are preferred over those with a random arrangement without directionality. By incorporating carbon fibers in the matrix in this manner, they can be preferably used as carbon composite materials with high tensile strength and high elasticity. Specifically, commercially available carbon composite materials include, for example, the Sigrabond series from SGL Carbon Japan Co., Ltd. and the CCM190 series from Nippon Carbon Co., Ltd., and can be freely selected and used. Furthermore, carbon composite materials impregnated with Si can also be freely selected and used. While the processing method for these carbon composite materials is not particularly limited, they can be processed into desired structural shapes using common processing techniques such as cutting, grinding, and water jet cutting.

[0035] The deformation suppressing member 5 is preferably disposed only in the central region R1 within the hollow steel material 1. The length L2 of the deformation suppressing member 5 in the longitudinal direction Y is preferably 1 / 2 to 1 / 4 of the length L1 of the hollow steel material 1, and in the example of Figure 2 it is 1 / 3. The thickness of each part of the deformation suppressing member 5 is not particularly limited, but may be set arbitrarily depending on the size and strength of the hollow steel material 1, as long as it has a thickness that provides sufficient strength to suppress deformation.

[0036] (positioning member) The positioning member 6 is a member that functions to position the deformation suppression member 5 only in the central region R1 within the hollow steel material 1. The positioning member 6 is preferably arranged with the same length (L3, L4) on both sides (both side regions R2, R3) of the deformation suppression member 5. Since the positioning member 6 is arranged with the same length on both sides of the deformation suppression member 5, it is advantageous for suppressing deformation at the center of the hollow steel material 1. The material of such a positioning member 6 is not particularly limited, and like the deformation suppression member 5, it may be the same or similar material as the hollow steel material 1 or a carbon-based composite material (CC composite member). However, considering the role of the positioning member 6, it is preferable that the positioning member 6 be made of the same or similar material as the hollow steel material 1 from a cost perspective.

[0037] As shown in Figures 2, 3 and 7(A), the structural form of the positioning member 6 is composed of at least a center shaft 7 and circular plates 8 (8a, 8b) provided on both ends of the center shaft 7. The circular plates 8 (8a, 8b) provided on both ends of the center shaft 7 are preferable because they allow the deformation suppression member 5 to be stably positioned only in the central region R1 within the hollow steel material 1. The outer diameter of the circular plates 8 (8a, 8b) is approximately the same as the inner diameter of the hollow steel material 1, and is preferably of a size that allows easy insertion into the hollow steel material 1. Symbol 8a is the circular plate on the side that abuts against the deformation suppression member 5, and symbol 8b is the circular plate that abuts against the end side.

[0038] As shown in Figure 7(B), the positioning member 6 may include a partition plate 8c in addition to the circular plates 8a and 8b at both ends. The partition plate 8c may be an additional circular plate provided at the middle position in the longitudinal direction Y when the length (L3, L4) of the positioning member 6 is long, or it may be a partition for providing a heat insulating material 9 between the partition plate 8c and the end on the end member 2 side. The positioning member 6 and its arrangement position are as described above. However, the partition plate 8c here also includes a partition plate in the longitudinal direction, and a heat insulating material is inserted between the partition plate and the end, which suppresses heat transfer to the bearing portion that supports the heat treatment furnace roller and also suppresses thermal deformation of the positioning member.

[0039] (Insulation material) A heat insulating material 9 may be provided in the area where the positioning member 6 is disposed. The location where the heat insulating material 9 is provided is not particularly limited, but it is preferable that the heat insulating material 9 is inserted on the end side of the partition plate 8c, for example, as shown in Fig. 7(C). By providing the heat insulating material 9 in such a position, heat transfer to the bearing portion that supports the heat treatment furnace rollers 10 can be suppressed, and thermal deformation of the positioning member 6 can also be suppressed.

[0040] As described above, the heat treatment furnace roller 10 and heat treatment furnace 20 according to the present invention can transport the heat treatment target part 21 or a transport member carrying the heat treatment target part 21 within the heat treatment furnace 20. [Explanation of symbols]

[0041] 1 Hollow steel material 1a Outer surface of hollow steel 1b Inner surface of hollow steel material 2 End members 5 Deformation suppression member 5a Top abutting the inner surface of the hollow steel material 5b Valleys other than the peaks 5c center 5d. Outer surface abutting the inner surface of the hollow steel material 6 Positioning member 7 Center shaft 8 circular plates 8a Circular plate abutting against the deformation suppression member 8b End side circular plate 8c Partition 9. Insulation 10 Heat treatment furnace roller 20 Heat treatment furnace 21 Parts to be heat treated 22, 22a, 22b, 22c Heat treatment area 23 Furnace entrance 24 Furnace outlet R1 central area R2, R3 bilateral regions L1 Length of hollow steel L2 Length of deformation suppression member L3, L4 Length of positioning member L5, L6: Length from the partition to the end (length of insulation installed) Y Longitudinal direction

Claims

1. A roller for a heat treatment furnace, characterized in that it is at least composed of a hollow steel material and a deformation suppression member that is inserted into the hollow steel material and contacts the inner surface of the hollow steel material, and the cross-sectional shape perpendicular to the longitudinal direction of the deformation suppression member is cross-shaped, star-shaped, angular, or circular.

2. The roller for a heat treatment furnace according to claim 1 , wherein the deformation suppression member is made of the same or similar material as the hollow steel material.

3. The roller for use in a heat treatment furnace according to claim 1 , wherein the deformation suppressing member is made of a carbon-based composite material.

4. A roller for a heat treatment furnace according to any one of claims 1 to 3, wherein positioning members for positioning the deformation suppression member only in the central region within the hollow steel material are arranged on both sides of the deformation suppression member with the same length.

5. 5. The roller for use in a heat treatment furnace according to claim 4, wherein the positioning member is composed of at least a center shaft and circular plates provided at both ends of the center shaft.

6. 6. The roller for use in a heat treatment furnace according to claim 5, wherein the positioning member includes a partition plate in addition to the circular plate, and a heat insulating material is inserted between the partition plate and the end portion.

7. A heat treatment furnace comprising the roller for a heat treatment furnace according to any one of claims 1 to 3 as a transport roller.

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