JP2014069199A - Rotating body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotating body for conveying a high-temperature article or the like, which suppresses heat dissipation and prevents generation of vibration during use.SOLUTION: A rotating body includes a body of which an outer circumference surface has an approximately cylindrical shape, and a shaft member fixed on an end of the body. The body includes a fixed hole part arranged on an end part in a direction along a center line of the body. An outer circumference surface of a fixed part of the shaft member is directly fixed on an inner circumference surface of the fixed hole part. A rough surface part is formed on at least one of an inner circumference surface of the fixed hole part and the outer circumference surface of the fixed part.

Description

The present invention relates to a rotating body suitably used for conveying and supporting a heated steel plate, a steel slab, and other articles heated to a high temperature, for example, in a steel plate rolling line.

Steelworks are equipped with many heating furnaces, soaking furnaces or heat treatment furnaces in order to maintain articles such as steel plates and slabs at a high temperature or heat treatment. In these furnaces, articles such as steel plates and slabs are mainly transported by transport rolls (rotating bodies). Hereinafter, the prior art will be described by taking a steel plate as an example of an article heated and transported to a high temperature.

  The structure of the heating furnace 10 which is an example of the furnace in which the said roll is integrated is shown in FIG. Through-holes through which the body 11a of the roll 11 can be inserted are formed in the furnace walls 10a and 10a on both sides of the heating furnace 10. The roll 11 is disposed horizontally through the through hole so that the shaft member 11e is exposed from the through hole, and the shaft member 11e is rotatably supported by bearings 10b and 10b disposed outside the furnace. Yes. Here, the trunk | drum 11a is arrange | positioned in the heating chamber 10c conveyed while heating the steel plate W, and the steel plate W heated in the heating chamber 10c is conveyed, supported by the trunk | drum 11a.

  Patent Documents 1 and 2 below disclose an example of a heat-resistant roll provided with a ceramic body that can be used as a roll for conveying an article such as a heated steel plate incorporated in a heating furnace as described above.

  Patent Document 1 includes a roll for a molten metal plating bath including a hollow body that comes into contact with a steel plate and a shaft member joined to the body, and the body and the shaft member are each formed of ceramics. The inner surface of the fuselage is composed of a large-diameter region at both ends and a small-diameter region at the center, the shaft member has a small-diameter portion, a flange portion, and a large-diameter portion, and the large-diameter region of the fuselage A diameter portion is joined, and the shaft member is formed with a plurality of longitudinal grooves through the large diameter portion and the flange portion, and the shaft member is joined to both end portions of the body. In the state, a roll for a molten metal plating bath is disclosed in which the groove portion forms a hole communicating with the inside of the roll.

  Patent Document 2 discloses a roll that is used at a high temperature in which a ceramic shaft is packaged on a metal shaft member, and water is circulated in the shaft member to make the roll shaft member water-cooled. A heat insulating material is disposed between the sleeves, and at least one of both ends of the sleeve is elastically pressed by a pressing material having the shaft member as a seat in the axial direction thereof. A high temperature resistant roll is disclosed in which the sleeve supports a load acting in a direction perpendicular to the outer surface thereof.

JP 2006-193814 A Japanese Unexamined Patent Publication No. 64-55325

  In recent years, there has been a demand for uniform temperature distribution of a heated steel sheet in order to homogenize the structure and characteristics of the steel sheet. In addition, energy conservation is required to protect the global environment. Each of the rolls described in Patent Documents 1 and 2 has the following problems although the body is made of ceramics whose thermal conductivity is lower than that of metal, so that it can meet the above requirements.

  That is, as shown in FIG. 4, the steel plate W is heated in the heating chamber 10c, but the heat applied to the steel plate W is transmitted to the body 11a through the outer peripheral surface with which the steel plate W contacts. Here, when the roll described in Patent Document 1 is applied to the roll 11 shown in FIG. 4, the roll of Patent Document 1 is bonded in a state where the body 11 a and the shaft member 11 e are in close contact with each other. The heat transferred to the body 11a is transferred to the shaft member 11e disposed outside the furnace and radiated to the outside of the furnace. Since the heat applied to the steel sheet W is easily radiated to the outside of the furnace through the body 11a and the shaft 11e, the temperature distribution of the steel sheet W becomes non-uniform and there is a limit to the reduction of energy consumption. .

  On the other hand, when the roll described in Patent Document 2 is applied to the roll 11 shown in FIG. 4, a heat insulating material is interposed between the ceramic sleeve constituting the body 11a and the metal roll shaft constituting the shaft member 11e. Therefore, heat transfer from the body 11a to the shaft member 11e is insulated by the heat insulating material. As a result, the heat transmitted from the body 11a to the shaft member 11e disposed outside the furnace is reduced, and the shaft member 11e has a water cooling structure, so that heat radiation from the shaft member 11e to the outside of the furnace can be suppressed. . However, the roll of Patent Document 2 is deformed during use of a heat insulating material made of ceramic fiber with low rigidity, and the shaft centers of the body 11a and the shaft member 11e are shifted, and vibration due to the swinging of the body 11a occurs. However, there is a problem that surface defects such as waviness and wrinkles occur in the steel sheet to be conveyed.

  The present invention has been made in view of the above-described problems of the prior art, and provides a rotating body that suppresses heat dissipation and generates less vibration during use in a rotating body that conveys high-temperature articles. Objective.

  One aspect of the present invention that achieves the above object is a rotating body having a substantially cylindrical body having an outer peripheral surface and a shaft member fixed to an end of the body, and the body is located at a center line of the body. A fixing hole provided at an end in a direction along the shaft, and the shaft member has an outer peripheral surface of the fixing portion directly fixed to an inner peripheral surface of the fixing hole, and an inner periphery of the fixing hole The rotating body has a rough surface portion formed on at least one of the surface and the outer peripheral surface of the fixed portion.

  In another aspect of the present invention, the body is composed of at least two body members, and at least one of the body members is provided at an end portion in a direction along a center line of the body. The other body member has a fixed hole portion, and the outer peripheral surface of the fixed portion is in close contact with the inner peripheral surface of the fixed portion of the one body member and is fixed. In the case of this configuration, the rough surface portion is formed on at least one of the inner peripheral surface of the fixing hole portion of the one body member and the outer peripheral surface of the fixing portion of the other body member.

  In addition, it is desirable that the rough surface portion is provided almost all around the center line of the body.

  Furthermore, the surface roughness (Rmax) of the rough surface portion is preferably 5 to 80 μm.

  Further, in the center line direction, joint portions are respectively formed on the inner peripheral surface of the fixed hole portion and the outer peripheral surface of the fixed portion, and the joint portions are formed to face each other in a direction orthogonal to the center line. It is desirable.

  In addition, it is desirable that both the body and the shaft member are made of ceramics.

  According to the present invention, it is possible to configure a rotating body that suppresses heat dissipation and generates less vibration during use, and the object of the present invention can be achieved.

It is a front view which shows the rotary body of 1st Embodiment which concerns on this invention in a partial cross section. It is the A section enlarged view of Drawing 1 (a). It is DD sectional drawing of Fig.1 (a). It is a front view which shows the rotary body of the 1st modification of the rotary body of FIG. 1 in a partial cross section. It is BB sectional drawing of Fig.2 (a). It is a front sectional view of a rotating body according to a second embodiment of the present invention. It is the C section enlarged view of Drawing 3 (a). It is a figure which shows the structure of the heating furnace in which a rotary body is integrated.

  Hereinafter, the present invention will be described based on the rotating bodies of the first and second embodiments with reference to the drawings. It should be noted that the present invention is not limited to the embodiments described below, and the present invention may be modified or improved as appropriate based on the ordinary knowledge of those skilled in the art without departing from the spirit of the present invention. It should be understood that it falls within the scope of Moreover, each component which the rotary body of 1st, 2nd embodiment has is not limited only to implementation of the said embodiment, It can implement in combination suitably.

[First embodiment]
FIG. 1A is a partial front view of the rotating body according to the first embodiment of the present invention, FIG. 1B is an enlarged view of part A of FIG. 1A, and FIG. ) Will be described with reference to FIG. As shown in FIG. 1, the rotating body 1 according to the first aspect includes a body 1a and a shaft member 1e fixed to the end of the body 1a. The body 1a whose outer peripheral surface 1b has a substantially cylindrical shape includes a fixed hole portion 1d provided at an end portion in the center line direction, and the outer peripheral surface 1j of the fixed portion 1i of the shaft member 1e The portion 1d is in close contact with the inner peripheral surface 1f and directly fixed. A rough surface portion 1h is formed on at least one of the inner peripheral surface 1f of the fixed hole portion 1d and the outer peripheral surface 1j of the fixed portion 1i. Hereinafter, the body 1a, the shaft member 1e, and the rough surface portion 1h, which are basic components of the rotating body 1, will be described in that order.

[body]
As shown in FIGS. 1A and 1C, the body 1a of the first aspect having a substantially cylindrical shape has a substantially columnar hollow portion 1c extending in the center line direction coaxially with the body 1a, and has a high temperature. The outer appearance of the outer peripheral surface 1b with which the article comes into contact is substantially cylindrical. The shape of the body 1a is not limited to a substantially cylindrical shape, and the outer peripheral surface 1b of the portion that is in contact with the high-temperature article only needs to have a substantially cylindrical shape, and other portions may have other shapes. And in the rotary body 1 of this aspect, as shown to Fig.1 (a), the edge part of the substantially cylindrical hollow part 1c becomes the fixed hole part 1d as it is in the centerline direction.

  Note that the body 1a may be solid. In that case, a concave fixing hole portion may be formed coaxially with the body at the end portion of the body, and the fixing portion of the shaft member may be fixed to the fixing hole portion.

  Although the material which comprises the fuselage | body 1a shown in FIG. 1 does not have a special limitation, the point which suppresses abrasion of the outer peripheral surface 1b by friction with a high temperature article, the heat transfer in the fuselage | body 1a is suppressed, and the heat radiation from the rotary body 1 is suppressed. In view of the above, it is desirable to use ceramics with low thermal conductivity and high hardness. Ceramics include alumina, zirconia, silica and other oxide ceramics, zirconium boride, titanium boride, boron boride and other boride ceramics, silicon carbide, boron carbide and other carbide ceramics. it can. However, it is preferable that the rotating body 1 that conveys an article heated to a high temperature is excellent in high-temperature strength and thermal shock resistance. Therefore, as the ceramic constituting the body 1a, silicon nitride / aluminum nitride and other nitride ceramics are preferable, particularly silicon nitride ceramics containing sialon excellent in high temperature strength, more preferably 4-point bending strength of 500 MPa or more, Vickers It is preferable that the body 1a is made of silicon nitride ceramics having a hardness of 1300 or more, a relative density of 95% or more, and a Young's modulus of 250 to 350 GPa.

The silicon nitride ceramic is composed of silicon nitride crystals or hard particles of sialon crystals in which Al and O are dissolved in silicon nitride as the main crystal, and a space between them is formed by a grain boundary phase formed from a sintering aid. Therefore, since it has heat resistance and high strength and high hardness can be obtained, it is preferable when used as a rotating body for transporting a heated steel plate or the like. In particular, when the four-point bending strength is 500 MPa or more, it becomes difficult to break due to mechanical stress when the steel sheet is conveyed, and when the Vickers hardness is 1300 or more, the wear of the body 1a due to the steel sheet is reduced and the life is long. This is because a rotating body is obtained. A relative density of 95% or more is preferable because a four-point bending strength of 500 MPa or more and a Vickers hardness of 1300 or more can be obtained. When the Young's modulus is 250 to 350 GPa, it is difficult for the fuselage to bend, the steel plate can be transported smoothly, and the quality of the steel plate is hardly adversely affected. The fourth and fifth having the long fuselage described below. In the case of the rotating body of the aspect, it is particularly preferable. As the sintering aid, Al ₂ O ₃ , MgO, rare earth element oxide and the like are preferable. Among them, silicon nitride is the main crystal, 1 to 7 mass% of MgO and 1 rare earth element oxide are used as the sintering aid. The silicon nitride ceramic used in an amount of ˜7% by mass is preferable from the viewpoint of achieving both high strength and thermal shock resistance. As the rare earth element, any element of Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu can be preferably used. Among these, Y, Ce, Sm, Dy, Er, Yb, and Lu, especially Y and Er are preferable in terms of characteristics and cost. Among them, Y is particularly preferable.

  As described above, the body 1a may be solid. However, when the substantially cylindrical body 1a is formed of ceramics, particularly preferably silicon nitride ceramics including sialon as described above, the body 1a is shown in FIG. Thus, it is preferable that the trunk | drum 1a which a high temperature article contacts has comprised the substantially cylindrical shape. By making the body 1a into a substantially cylindrical shape, the thickness of the portion where the high-temperature article contacts can be reduced, the thermal shock stress generated in the body 1a can be suppressed, and the body 1a can be prevented from being damaged. . Here, the thickness of the body 1a is more preferably 5 to 30 mm. If it is less than 5 mm, it may be easily damaged by the load from the steel plate when transporting the steel plate, and if it is 30 mm or more, the body 1a is likely to be damaged by the thermal shock caused by the heated steel plate. Because there is also.

[Shaft member]
The shaft member 1e has a fixed portion 1i at one end thereof. The fixing portion 1i has an outer diameter substantially the same as the inner diameter of the fixing hole portion 1d of the body portion 1a, and the fixing hole portion 1k in a state where the outer peripheral surface 1j is in contact with the inner peripheral surface 1f of the fixing hole portion 1d. It is fixed directly to.

  In addition, although the shaft member 1e of this aspect is solid, the hollow shaft member which provided the hollow part which penetrates the shaft member 1e along the centerline I may be sufficient. However, the strength of the shaft member 1e can be increased by making the shaft member 1e solid compared to a hollow shaft member. Here, since the high-temperature article is not in direct contact with the shaft member 1e, damage due to thermal shock is unlikely to occur. However, the shaft member may be damaged due to excessive load acting during use or impact caused by handling. Even in such a case, it is possible to increase the strength of the shaft member 1e by preventing the breakage by providing a solid shape capable of securing the cross-sectional area. The configuration in which the shaft member 1e is solid is effective particularly in the shaft member 1e having a portion having a minimum diameter of 50 mm or less when the shaft member 1e has a small diameter.

  The fixing method of the fixing hole 1d of the body 1a and the fixing part 1i of the shaft member 1e is preferably fixed by shrink fitting. In the case of fixing by shrink fitting, it is preferable that the shrinkage rate which is a value obtained by dividing the shrinkage allowance by the inner diameter of the fixing hole 1d is in the range of 0.01 / 1000 to 0.5 / 1000. If the shrinkage fit is less than 0.01 / 1000, the fastening force of the fixing part 1i by the fixing hole 1d is insufficient, and the fixing part 1i may drop off. Moreover, when the shrinkage-fit rate exceeds 0.5 / 1000, the tightening force by shrink-fit becomes excessive, and the body 1a or the shaft member 1e may be damaged. A more preferable shrink fitting rate is 0.2 / 1000 to 0.3 / 1000. Further, in order to prevent vibration due to swinging, the concentricity between the fixing hole portion 1d of the body 1a and the fixing portion 1i of the shaft member 1e is preferably 0.2 mm or less.

  The material constituting the shaft member 1e is not particularly limited as in the case of the body 1a, but a material having a thermal expansion coefficient approximate to that of the material constituting the body 1a is used so that the amount of thermal expansion in the furnace is almost equal. It is preferable to use the same material. Thereby, generation | occurrence | production of the vibration resulting from the whirling of the fuselage | body 1a which arises by loosening of the fuselage | body 1a can be suppressed. In addition, it is desirable that the shaft member 1 e is made of ceramics having low thermal conductivity from the viewpoint of suppressing heat transfer in the shaft member 1 e and suppressing heat radiation from the rotating body 1. That is, when the body 1a is made of ceramics, it is most preferable that the shaft member 1e is also made of ceramics, desirably the same ceramic as the body 1a, and the rotating body 1 has a ceramic integrated structure. The ceramics that can be selected are the same as those of the body 1a.

[Rough surface]
The rough surface portion 1h is an element that functions as a heat insulating portion that suppresses heat transfer from the body portion 1a to the shaft portion 1e as described in detail below. And the rough surface part 1h of this aspect is formed in the outer periphery 1j of the fixing | fixed part 1i of the axial part 1e in the perimeter of the centerline I as shown in FIG.1 (b). The rough surface portion 1h may be formed on the inner peripheral surface 1f of the fixing hole portion 1d of the body portion 1a, or may be formed together with the fixing hole portion 1d and the fixing portion 1i. Further, the rough surface portion 1h need not be formed in the entire width of the fixed portion 1i in the center line direction, and may be formed in a part thereof. Also good.

  Furthermore, although the rough surface part 1h of this aspect is formed in the substantially perimeter around the centerline I, even if it forms partially, it can show a heat insulation function. For example, see FIG. 2 (a) which is a front view of a rotating body 2 which is a first modification of the rotating body of FIG. 1 and FIG. 2 (b) which is a cross-sectional view along BB in FIG. 2 (a). And explain.

  As shown in FIG. 2 (b), the shaft member 2e of the rotating body 2 according to the first modification is a rough arrangement partially arranged on the outer peripheral surface 1j of the fixing portion 1i when viewed from the center line direction. It has a surface portion 1h. Here, the rotating body 2 shown in FIG. 2 has a configuration in which two rough surfaces 1h formed around the center line I in a range of 90 ° C. are point-symmetric with respect to the center line I. The rough surface portion 1h may be a single surface, and a plurality of rough surface portions 1h may be arranged at unequal angles. As described above, the rough surface portion 1h may be partially arranged around the center line I. However, in order to effectively act as a heat insulating portion and suppress the transfer of heat from the body to the shaft member, the rough surface portion 1h is used. It is desirable to have a sufficient area, and it is preferable to dispose almost the entire circumference around the center line I as in the rough surface portion 1h shown in FIG.

  The surface roughness (Rmax) of the rough surface portion 1h is preferably in the range of 5 to 80 μm. When the surface roughness (Rmax) of the rough surface portion 1h is less than 5 μm, it is difficult to sufficiently exhibit the heat insulating effect. On the other hand, when the surface roughness (Rmax) exceeds 80 μm, the contact area between the fixing hole portion 1d and the fixing portion 1i decreases, and it may be difficult to fix the body 1a and the shaft member 1e. In addition, when the shaft member 1e is made of ceramics, if the surface roughness is rough, the shaft member 1e may be broken starting from a recess formed in the outer peripheral surface 1j. As a method of forming the rough surface portion 1h, when the shaft member 1e is made of metal, for example, cutting, electric discharge machining, or other various processing methods may be applied, and the shaft member 1e is made of ceramics. In such a case, for example, shot blasting, laser processing, or other various processing methods may be applied.

  According to the rotating body 1 shown in FIG. 1, the following effects can be obtained. That is, the high-temperature article is conveyed while being in contact with the outer peripheral surface 1b of the body 1a. And the heat | fever of the said goods is transmitted to the fuselage | body 1a through the outer peripheral surface 1b. The heat transferred to the body 1a is transferred in the direction of the center line and reaches the end of the body 1a. Here, the rotating body 1 according to the present invention has a rough surface portion 1h formed on at least one of the inner peripheral surface 1f of the fixed hole portion 1d and the outer peripheral surface 1j of the fixed portion 1i. The hollow rough surface portion 1h constitutes a heat insulating portion, and the heat reaching the end of the body 1a as described above is prevented from being transmitted to the shaft member 1e. As a result, heat radiation from the rotating body 1 is suppressed, and the temperature distribution of the article can be made uniform and energy can be saved.

  In addition, the shaft member 1e has its fixing portion 1i directly fixed to the fixing hole 1d of the body 1a without any other member, and the body 1a is displaced by the shift of the shaft center between the body 1a and the shaft member 1e. Occurrence of runout is suppressed. As a result, the occurrence of vibration of the rotating body 1 is reduced, and surface defects can be prevented from occurring in the conveyed article.

  Next, the joint portions 1g and 1k provided as preferable elements in the rotating body 1 of this aspect will be described. As shown in FIG.1 (b), the joint part 1g which has a smooth inner peripheral surface in the both ends in the centerline direction is formed in the internal peripheral surface 1f of the fixing hole part 1d of the trunk | drum 1a. Further, the outer peripheral surface 1j of the fixed portion 1i of the shaft member 1e is also formed with a joint portion 1k having smooth outer peripheral surfaces at both ends in the center line direction. In the direction orthogonal to the center line I (hereinafter sometimes referred to as the radial direction), the joint portions 1g and 1k formed on both sides are arranged to face each other. In the rotating body 1 of this aspect, the rough surface portion 1h is disposed between the joint portions 1k and 1k formed at both ends of the fixed portion 1i of the shaft member 1e.

  According to the joint portions 1g and 1k formed together with the fixed hole portion 1d and the fixed portion 1i as described above, the joint portions 1k and 1g arranged so as to face each other in the radial direction are smooth surfaces. The shaft portion 1e is securely fixed to the body portion 1a by the close contact of both. Thereby, even when an excessive rotational torque acts during operation, it is possible to suppress loosening of the fixing of the body portion 1a and the shaft portion 1e. The joint portions 1g and 1k may be formed only at one end of the fixed hole portion 1d and the fixed portion 1i in the center line direction, or may be formed at the center portion. In other words, the joints 1k and 1g may be arranged at any position in the center line direction.

[Second Embodiment]
A rotating body 3 according to a second embodiment of the present invention will be described with reference to FIG. Here, FIG. 3A is a front sectional view of the rotating body 3 of the second mode, and FIG. 3B is an enlarged view of a C portion of FIG.

  The rotating body 3 according to the second aspect has (1) three body members 3n to 3p, and a body 3a is formed by a combination of the body members 3n to 3p, and (2) a rough surface portion is a body member. It is different from the rotating body of the first aspect in that it is formed on the outer peripheral surface of 3n · 3p. Here, the rotating body 3 of this aspect is an advantageous structure when a rotating body having a long body 3a is formed. That is, among the three body members 3n to 3p constituting the body 3a, the body member 3o disposed in the center portion in the center line direction is an element that comes into contact with a high-temperature article to be conveyed. The body members 3n and 3p arranged on both sides are elements connected to the body member 3o to form a long body 6a. In addition, although the trunk | drum 3a of this aspect is comprised by the three trunk | drum members 3n-3p, the trunk | drum should just be comprised by the at least two trunk | drum member.

  Hereinafter, the difference between the above (1) and (2) will be described in detail. In addition, as shown to Fig.3 (a), the rotary body 3 of this aspect is the one trunk | drum member 3o arrange | positioned in the center in the centerline direction, and the other trunk | drum member arrange | positioned at the both sides of the trunk | drum member 3o 3n and 3p, but the relationship between the body members 3n and 3p and the body member 3o is the same, so the left side (one side) body member 3n and the center body member 3o will be described, and the right side (the other side) The description of the side) body member 3p is omitted.

  As shown in FIG. 3A, in the center line direction, a substantially cylindrical body member (hereinafter sometimes referred to as a first body member for understanding) 3o constituting the central portion of the body 3a is a center. It has a substantially cylindrical hollow portion 3c penetrating along the line I, and as shown in FIG. 3 (b), both ends of the hollow portion 3c in the center line direction are fixed hole portions 3d as they are. And the substantially cylindrical trunk | drum member (henceforth a 2nd trunk | drum member for understanding) 3n arrange | positioned on the left side of the 1st trunk | drum member 3o has the fixing | fixed part 3i in the end, The outer diameter of the outer peripheral surface 3j of the fixing portion 3i is substantially the same as the inner diameter of the fixing hole portion 3d of the first body member 3o. Thus, the second body member 3n is fixed coaxially to the body member 3o in a state where the outer peripheral surface 3j of the fixing portion 3i is in contact with the fixing hole 3d of the first body member 3o. 6a is formed. The first body member 3o and the second body member 3n are preferably fixed by shrinkage fitting as in the case of the rotating body of the first aspect.

  The configuration of the shaft member 1e is the same as that of the rotating body of the first aspect. That is, the fixing portion 1i of the shaft member 1e is fixed to the fixing hole portion 1d formed at the end portion of the body 3a, that is, the end portion of the second body member 3n.

  And in the rotary body 3 of this aspect, the rough surface part 1h is formed in the outer peripheral surface of the fixing | fixed part 3i of the trunk | drum member 3n in substantially the perimeter around the centerline I. The rough surface portion 1h may be formed on the inner peripheral surface 3f of the fixing hole portion 3d of the body member 3o, or may be formed together with the fixing hole portion 3i and the fixing portion 3d. Further, similarly to the rotating body of the first aspect, the rough surface portion 1h may be partially provided around the center line I. In addition, the rough surface portion 1h does not need to be formed in the entire width of the fixed portion 3i in the center line direction, and may be formed in a part thereof, and a plurality of rough surface portions 1h are provided at equal pitch or unequal pitch. May be. Further, in the rotating body 3 of this aspect, it is preferable to provide the joint portions 1g and 1k at the end portions of the fixing hole portion 3d and the fixing portion 3i in the center line direction, similarly to the rotating body of the first aspect.

  According to the rotating body 3, the rough surface portion 1 h acts as a heat insulating portion, and heat transfer from the first body member 3 o to which the high-temperature article comes into contact with the second body member 3 n is limited. The heat radiation from is suppressed. Further, the second body member 3n is directly fixed to the first body member 3o without interposing other members, and is caused by the shift of the axial center between the first body member 3o and the second body member 3n. Occurrence of swinging of the body 3a is suppressed.

1 (2, 3) Rotating body 1a (3a) Body 1b Outer peripheral surface 1c (3c) Hollow portion 1e (2e) Shaft member 1d Fixed hole portion 1g (1k) Joined portion 1h Rough surface portion 1i Fixed portion 3n (3o, 3p) Body member 3d (3i) Fixed part I Center line

Claims (6)

A rotating body having a substantially cylindrical body having an outer peripheral surface and a shaft member fixed to an end of the body,
The fuselage has a fixing hole provided at an end in a direction along the center line of the fuselage,
The shaft member has its outer peripheral surface fixed directly to the inner peripheral surface of the fixing hole,
A rotating body in which a rough surface portion is formed on at least one of an inner peripheral surface of the fixed hole portion and an outer peripheral surface of the fixed portion. The body is composed of at least two body members,
At least one of the body members has a fixing hole provided at an end in a direction along the center line of the body,
The other body member is fixed in such a manner that the outer peripheral surface of the fixing portion thereof is in close contact with the inner peripheral surface of the fixing portion of the one body member,
The rotating body according to claim 1, wherein the rough surface portion is formed on at least one of an inner peripheral surface of a fixing hole portion of the one body member and an outer peripheral surface of a fixing portion of another body member.   The rotating body according to claim 1, wherein the rough surface portion is provided on substantially the entire circumference around a center line of the body.   The rotating body according to any one of claims 1 to 3, wherein the rough surface portion has a surface roughness (Rmax) of 4 to 80 µm.   In the direction along the center line of the body, joint portions are formed on the inner peripheral surface of the fixed hole portion and the outer peripheral surface of the fixed portion, respectively, and the joint portions are opposed to each other in a direction perpendicular to the center line. The rotating body according to claim 1, wherein the rotating body is formed.   The rotating body according to any one of claims 1 to 5, wherein both the body and the shaft member are made of ceramics.

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