JP4292508B2 - Ceramic roll - Google Patents
Ceramic roll Download PDFInfo
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- JP4292508B2 JP4292508B2 JP2003413528A JP2003413528A JP4292508B2 JP 4292508 B2 JP4292508 B2 JP 4292508B2 JP 2003413528 A JP2003413528 A JP 2003413528A JP 2003413528 A JP2003413528 A JP 2003413528A JP 4292508 B2 JP4292508 B2 JP 4292508B2
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- ceramic
- shaft
- metal
- roll
- sleeve
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- 239000000919 ceramic Substances 0.000 title claims description 54
- 229910052751 metal Inorganic materials 0.000 claims description 41
- 239000002184 metal Substances 0.000 claims description 41
- 229910052782 aluminium Inorganic materials 0.000 claims description 14
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 14
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 13
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 12
- 239000010410 layer Substances 0.000 claims description 12
- 239000010959 steel Substances 0.000 claims description 12
- 238000005098 hot rolling Methods 0.000 claims description 10
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 9
- 238000009792 diffusion process Methods 0.000 claims description 9
- 229910052804 chromium Inorganic materials 0.000 claims description 8
- 239000011651 chromium Substances 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 239000011247 coating layer Substances 0.000 claims description 6
- 229910000599 Cr alloy Inorganic materials 0.000 claims description 4
- 239000000788 chromium alloy Substances 0.000 claims description 4
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 239000000463 material Substances 0.000 description 29
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 18
- 239000000843 powder Substances 0.000 description 11
- 229910045601 alloy Inorganic materials 0.000 description 8
- 239000000956 alloy Substances 0.000 description 8
- 229910052742 iron Inorganic materials 0.000 description 8
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 8
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- 230000003647 oxidation Effects 0.000 description 6
- 238000007254 oxidation reaction Methods 0.000 description 6
- 239000002344 surface layer Substances 0.000 description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 5
- 238000005336 cracking Methods 0.000 description 5
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 238000013001 point bending Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- 238000007088 Archimedes method Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 235000019270 ammonium chloride Nutrition 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 238000009694 cold isostatic pressing Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 102220062469 rs786203185 Human genes 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001694 spray drying Methods 0.000 description 1
Landscapes
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
- Ceramic Products (AREA)
Description
本発明は、熱間圧延ラインにおいて鋼板を搬送、ガイド、圧延するなど鋼板を製造するのに用いるロールに係り、詳しくは金属製軸材の外周にセラミックス製スリーブを嵌着させたセラミックス製ロールに関する。 The present invention relates to a roll used to manufacture a steel sheet such as conveying, guiding, and rolling a steel sheet in a hot rolling line, and more particularly to a ceramic roll having a ceramic sleeve fitted on the outer periphery of a metal shaft. .
従来から鉄鋼熱間圧延ラインに用いられる搬送用ロールなどには、金属製ロールが多く使われている。しかしながら、金属製ロールは摩耗しやすく、また耐食性、耐酸化性および耐熱性に劣るという問題があった。また金属自体の重量が重いためロールの取り替え作業が容易でないという問題があった。そこで、これらの欠点を解決するために金属製ロールに替わりセラミックス製ロールが種々提案されている。 Conventionally, many metal rolls are used for the conveyance roll etc. which are used for a steel hot rolling line. However, metal rolls have a problem that they are easily worn and have poor corrosion resistance, oxidation resistance, and heat resistance. Moreover, since the weight of the metal itself is heavy, there is a problem that it is not easy to replace the roll. In order to solve these drawbacks, various ceramic rolls have been proposed instead of metal rolls.
例えば特許文献１には、ロールの絶縁性を向上させるために、金属からなるロール表面にアルミナやジルコニア等のセラミックスを５０〜１００μｍの厚みで溶射を施してなる熱間圧延ラインで用いられる搬送ロールが記載されている。 For example, Patent Document 1 discloses a transport roll used in a hot rolling line in which ceramic such as alumina or zirconia is thermally sprayed to a thickness of 50 to 100 μm on a metal roll surface in order to improve the insulation of the roll. Is described.
また特許文献２には、熱間圧延ラインにおいて、圧延鋼板の上下から互いに対向した誘導加熱コイルを配置して圧延鋼板の幅方向両端部を加熱する誘導加熱装置の直下または前後に配置され、金属製芯金にセラミックス製スリーブを嵌合した熱間圧延ライン向けローラであって、セラミックス製スリーブは窒化ケイ素焼結体からなり、金属製芯金の胴長方向の両側にそれぞれ外嵌され、そのスリーブ外嵌部がローラの胴長方向中央部よりも大径となることが記載されている。 Further, in Patent Document 2, in a hot rolling line, induction heating coils opposed to each other from above and below the rolled steel sheet are arranged to be placed directly below or before and behind an induction heating apparatus that heats both ends in the width direction of the rolled steel sheet, A roller for a hot rolling line in which a ceramic sleeve is fitted to a metal core, the ceramic sleeve is made of a silicon nitride sintered body, and is fitted on both sides of the metal core metal in the body length direction. It is described that the sleeve outer fitting portion has a larger diameter than the center portion in the body length direction of the roller.
特許文献１のロールにおいては、熱膨張係数が７〜１１×１０−６／℃程度であるアルミナやジルコニア等のセラミックスを５０〜１００μｍの厚みでロール表面に溶射しており、被溶射材である金属製ロールの熱膨張係数１５〜４０×１０−６／℃程度に比べて熱膨張係数差が大きいため、ロール全体が繰り返し加熱冷却（稼動中のロール表面温度は約７００〜１３００℃、冷却時は常温）された際にアルミナやジルコニア等の極めて薄い溶射膜が剥離しやすく、ロールが短寿命であるという問題があった。 In the roll of Patent Document 1, ceramics such as alumina or zirconia having a thermal expansion coefficient of about 7 to 11 × 10 −6 / ° C. is sprayed on the roll surface with a thickness of 50 to 100 μm, and is a sprayed material. Since the difference in thermal expansion coefficient is larger than that of metal rolls of about 15 to 40 × 10 −6 / ° C., the entire roll is repeatedly heated and cooled (the roll surface temperature during operation is about 700 to 1300 ° C. during cooling) Has a problem that the roll is short-lived because an extremely thin sprayed film such as alumina or zirconia is easily peeled off.
特許文献２は、溶射膜における剥離の問題を解決したものであり、溶射膜に比べて厚みのあるセラミックス焼結体製のスリーブを金属製軸材（芯金）に嵌合した構成であるため、ロールの耐用寿命を向上させることができる。 Patent Document 2 solves the problem of delamination in the sprayed film, and has a configuration in which a sleeve made of a ceramic sintered body having a thickness larger than that of the sprayed film is fitted to a metal shaft (core metal). The service life of the roll can be improved.
しかしながら、特許文献２は軸材として比較的高価なステンレス鋼もしくはＣｒ−Ｍｏ鋼材を用いているため製作費用が嵩むという問題があった。また、熱間圧延ラインで長期間使用されると、ステンレス鋼やＣｒ−Ｍｏ鋼の軸材でも外周部の表面層が酸化して、軸材の表面層に錆が発生する。そして、この錆によりセラミックス製スリーブと軸材のクリアランスが狭まり、ロール加熱時に熱膨張係数が約７〜１１×１０−６／℃の軸材が約３〜４×１０−６／℃のセラミックス製スリーブの内面を押圧し、セラミックス製スリーブ内面に引張応力を発生させて破損してしまうという問題があった。 However, since Patent Document 2 uses a relatively expensive stainless steel or Cr—Mo steel material as a shaft material, there is a problem that the manufacturing cost increases. Further, when used for a long time in a hot rolling line, the surface layer of the outer peripheral portion is oxidized even in the shaft material of stainless steel or Cr—Mo steel, and rust is generated in the surface layer of the shaft material. This rust narrows the clearance between the ceramic sleeve and the shaft material, and the shaft material having a thermal expansion coefficient of about 7 to 11 × 10 −6 / ° C. is about 3 to 4 × 10 −6 / ° C. There is a problem that the inner surface of the sleeve is pressed and a tensile stress is generated on the inner surface of the ceramic sleeve, resulting in damage.
そこで、本発明は金属製軸材として比較的低合金で安価な炭素鋼もしくは低合金からなる構造用合金鋼などを用いても、ロール使用時の加熱と冷却の熱サイクルが加わった際にセラミックス製スリーブが割れることを防ぐことができるセラミックス製ロールを提供することを目的とする。 Therefore, the present invention uses a relatively low alloy and inexpensive carbon steel or a structural alloy steel made of a low alloy as the metal shaft material, but the ceramics are subjected to heating and cooling thermal cycles during use of the roll. An object of the present invention is to provide a ceramic roll that can prevent the sleeve from being broken.
すなわち、第１の本発明のセラミックス製ロールは、熱間圧延ラインにおいて鋼板を製造するのに用いるセラミックス製ロールであって、１個または複数個のセラミックス製スリーブを金属製軸材の外周に嵌着して構成され、金属製軸材の表面に、アルミニウム合金被覆層またはクロム合金被覆層を形成したことを特徴とする。 That is, the ceramic roll according to the first aspect of the present invention is a ceramic roll used for manufacturing a steel plate in a hot rolling line, and one or more ceramic sleeves are fitted on the outer periphery of the metal shaft. An aluminum alloy coating layer or a chromium alloy coating layer is formed on the surface of the metal shaft.
第２の本発明のセラミックス製ロールは、熱間圧延ラインにおいて鋼板を製造するのに用いるセラミックス製ロールであって、１個または複数個のセラミックス製スリーブを金属製軸材の外周に嵌着して構成され、金属製軸材の表面に、アルミニウム拡散滲透層またはクロム拡散滲透層を形成したことを特徴とする。 A ceramic roll according to a second aspect of the present invention is a ceramic roll used for manufacturing a steel plate in a hot rolling line, and one or a plurality of ceramic sleeves are fitted on the outer periphery of a metal shaft. An aluminum diffusion permeable layer or a chromium diffusion permeable layer is formed on the surface of the metal shaft.
前記本発明において、セラミックス製スリーブは、窒化ケイ素を主成分とする焼結体からなることを特徴とする。また、窒化ケイ素を主成分とする焼結体は、常温における熱伝導率が５０Ｗ／（ｍ・Ｋ）以上であることを特徴とする。 In the present invention, the ceramic sleeve is made of a sintered body mainly composed of silicon nitride. In addition, the sintered body mainly composed of silicon nitride has a thermal conductivity of 50 W / (m · K) or more at normal temperature.
金属製軸材の機械的性質を殆ど劣化させることなく、軸材表面への密着性が良好であり、かつ耐高温酸化性、耐食性および耐摩耗性に優れた表面層を形成することにより、特に軸材表面の錆の発生を抑えてセラミックス製スリーブの割れを防ぐことができた。 By forming a surface layer that has good adhesion to the shaft surface with little deterioration in the mechanical properties of the metal shaft material, and excellent in high-temperature oxidation resistance, corrosion resistance, and wear resistance. The generation of rust on the shaft surface was suppressed, and the ceramic sleeve could be prevented from cracking.
まず、金属製軸材の表面にアルミニウム合金被覆層を形成するには、金属製軸材をアルミニウム溶融金属浴中に浸漬し、軸材の鉄と浴中のアルミニウムとの相互拡散により、軸材の表面に鉄とアルミニウムからなる合金層を生成し、その上の最表面にアルミニウムが付着される。また、金属製軸材の表面にクロム合金被覆層を形成するには、同様にクロム溶融金属浴中に浸漬すると、軸材の鉄と浴中のクロムとの相互拡散により、軸材の表面に鉄とクロムからなる炭化物層や化合物層が生成される。 First, in order to form an aluminum alloy coating layer on the surface of a metal shaft, the shaft is dipped in an aluminum molten metal bath and the shaft material is diffused between the shaft iron and the aluminum in the bath. An alloy layer made of iron and aluminum is formed on the surface of the aluminum, and aluminum is deposited on the outermost surface. In addition, in order to form a chromium alloy coating layer on the surface of a metal shaft, similarly, when immersed in a chrome molten metal bath, the surface of the shaft is affected by the mutual diffusion of iron in the shaft and chromium in the bath. A carbide layer and a compound layer made of iron and chromium are generated.
また、金属製軸材の表面にアルミニウム拡散滲透層を形成するには、例えば鉄とアルミニウムの合金粉、アルミナ粉、塩化アンモニウム粉を混合した粉末と軸材とを容器内に埋め込み、加熱することにより、アルミニウムが軸材の鉄と拡散し、軸材の表面にアルミニウム拡散滲透層が形成される。また、金属製軸材の表面にクロム拡散滲透層を形成するには、例えば鉄とクロムの合金粉、アルミナ粉、塩化アンモニウム粉を混合した粉末と軸材とを容器内に埋め込み、加熱することにより、クロムが軸材の鉄と拡散し、軸材の表面にクロム拡散滲透層が形成される。 In order to form an aluminum diffusion and permeable layer on the surface of a metal shaft, for example, a powder obtained by mixing an alloy powder of iron and aluminum, alumina powder, and ammonium chloride powder and a shaft are embedded in a container and heated. As a result, aluminum diffuses with the iron of the shaft material, and an aluminum diffusion / permeable layer is formed on the surface of the shaft material. In order to form a chromium diffusion layer on the surface of a metal shaft, for example, a powder obtained by mixing iron and chromium alloy powder, alumina powder, and ammonium chloride powder and a shaft material are embedded in a container and heated. As a result, chromium diffuses with the iron of the shaft material, and a chromium diffusion / permeation layer is formed on the surface of the shaft material.
これらの表面層は、軸材成分との合金で形成されている、アルミニウムおよびクロムの濃度が軸材表面から軸材中心部へ向かって次第に下がっているため、軸材の機械的性質を殆ど劣化させることなく、軸材との密着性が良好であり、加熱冷却の繰り返しによっても剥離することがない。また、特に耐高温酸化性、耐食性に優れているため、軸材表面の錆の発生を抑えることができ、錆に起因したセラミックス製スリーブと軸材のクリアランスの狭まりによるセラミックス製スリーブの割れを防止できる。 These surface layers are made of an alloy with the shaft material component, and the aluminum and chromium concentrations gradually decrease from the shaft material surface toward the shaft center, so the mechanical properties of the shaft material are almost degraded. Without adhesion, the adhesiveness with the shaft material is good, and it does not peel off by repeated heating and cooling. In addition, since it has excellent high-temperature oxidation resistance and corrosion resistance, it is possible to suppress the occurrence of rust on the shaft surface, and to prevent cracking of the ceramic sleeve due to rust and the narrowing of the clearance between the shaft material and the ceramic sleeve. it can.
また、セラミックス製スリーブを耐摩耗性、耐食性、耐酸化性および耐熱性に優れる窒化ケイ素を主成分とする焼結体で形成するのが好ましい。特に常温における熱伝導率を５０Ｗ／（ｍ・Ｋ）以上に高めることにより、熱衝撃による割れを十分に防止できる。さらには、窒化ケイ素を主成分とする焼結体の相対密度が９８%以上、常温における４点曲げ強度が６００ＭＰａ以上であると割れをいっそう防止できる。 The ceramic sleeve is preferably formed of a sintered body mainly composed of silicon nitride, which is excellent in wear resistance, corrosion resistance, oxidation resistance and heat resistance. In particular, by increasing the thermal conductivity at room temperature to 50 W / (m · K) or more, cracking due to thermal shock can be sufficiently prevented. Further, cracking can be further prevented when the sintered body containing silicon nitride as a main component has a relative density of 98% or more and a four-point bending strength at room temperature of 600 MPa or more.
図１は本発明の実施例であるセラミックス製ロールの概略図である。図１において、３個のセラミックス製スリーブ（スリーブ１ａ、１ｂ、１ｃ）を金属製の軸材５に嵌着して配置した。セラミックス製スリーブはそれぞれ外径３５５ｍｍ×内径３０５ｍｍ×長さ１００ｍｍの窒化ケイ素系セラミックス焼結体からなる。 FIG. 1 is a schematic view of a ceramic roll according to an embodiment of the present invention. In FIG. 1, three ceramic sleeves (sleeves 1 a, 1 b, 1 c) are fitted and arranged on a metal shaft member 5. Each of the ceramic sleeves is made of a silicon nitride ceramic sintered body having an outer diameter of 355 mm, an inner diameter of 305 mm, and a length of 100 mm.
次に本発明のセラミックス製スリーブの製造方法について説明する。平均粒径０．５μｍの窒化ケイ素粉末に、焼結助剤として、平均粒径０．２μｍの酸化マグネシウム粉末を３．０重量％、平均粒径２．０μｍの酸化イットリウム粉末を３．０重量％添加し、適量の分散剤を加えエタノール中で粉砕、混合した。ついで、噴霧乾燥後、篩を通して造粒した後、ゴム型に充填し、静水圧により冷間静水圧プレス（ＣＩＰ）を行い、所定形状の中空スリーブロールとなる成形体を作製した。この成形体を１９５０℃、６０気圧の窒素ガス雰囲気中で５時間焼成し、窒化ケイ素系セラミックス焼結体からなるスリーブを得た。更に得られた焼結体を、ダイヤモンド砥石を用いて所定の形状に加工し、窒化ケイ素系セラミックス製スリーブを製作した。 Next, a method for manufacturing the ceramic sleeve of the present invention will be described. Silicon nitride powder with an average particle size of 0.5 μm, 3.0 wt% magnesium oxide powder with an average particle size of 0.2 μm, and 3.0 wt% yttrium oxide powder with an average particle size of 2.0 μm as a sintering aid %, An appropriate amount of a dispersant was added, and the mixture was pulverized and mixed in ethanol. Next, after spray drying, the mixture was granulated through a sieve, filled into a rubber mold, and subjected to cold isostatic pressing (CIP) with hydrostatic pressure to produce a molded body to be a hollow sleeve roll having a predetermined shape. This molded body was fired in a nitrogen gas atmosphere at 1950 ° C. and 60 atm for 5 hours to obtain a sleeve made of a silicon nitride ceramic sintered body. Furthermore, the obtained sintered body was processed into a predetermined shape using a diamond grindstone, and a silicon nitride ceramic sleeve was manufactured.
また、得られた窒化ケイ素系セラミックス焼結体から、直径１０ｍｍ×厚さ３ｍｍの熱伝導率および密度測定用の試験片、縦３ｍｍ×横４ｍｍ×長さ４０ｍｍの４点曲げ試験片を採取した。密度はＪＩＳ Ｒ２２０５に基づいてアルキメデス法から求めた。相対密度はＪＩＳ Ｒ２２０５に準拠したアルキメデス法により実測密度を求めこれを計算により算出した理論密度で除した値とした。熱伝導率はレーザーフラッシュ法ＪＩＳ Ｒ１６１１に準拠して常温での比熱および熱拡散率を測定し熱伝導率を算出した。４点曲げ強度は常温にてＪＩＳ Ｒ１６０１に準拠して測定を行った。 Further, from the obtained silicon nitride ceramic sintered body, a test piece for measuring thermal conductivity and density having a diameter of 10 mm × thickness of 3 mm and a four-point bending test piece having a length of 3 mm × width of 4 mm × length of 40 mm were collected. . The density was determined from the Archimedes method based on JIS R2205. The relative density was obtained by dividing the measured density by the theoretical density calculated by calculating the measured density by the Archimedes method based on JIS R2205. The thermal conductivity was calculated by measuring the specific heat and thermal diffusivity at room temperature in accordance with the laser flash method JIS R1611. The 4-point bending strength was measured according to JIS R1601 at room temperature.
その結果、窒化ケイ素系セラミックス焼結体からなるセラミックス製スリーブは、相対密度が９９．２％、常温における熱伝導率が５５Ｗ／（ｍ・Ｋ）、常温における４点曲げ強度が９４０ＭＰａであった。 As a result, the ceramic sleeve made of the silicon nitride ceramic sintered body had a relative density of 99.2%, a thermal conductivity at room temperature of 55 W / (m · K), and a four-point bending strength at room temperature of 940 MPa. .
本発明の最も特徴である軸材５として、Ｓ３５Ｃ鋼材を用いて、胴部中央部の外径３００ｍｍである中実状の軸材を製作した。そして、この軸材５を約６８０℃のアルミニウム溶融金属浴中に約１時間浸漬させた後、浴中から取り出して、７３０℃で約３時間の熱処理を行い、軸材５の表面に厚さが０．９ｍｍの鉄とアルミニウムからなる合金層を得た。次いで、この軸材５の外径を約０．５ｍｍ研削し、所定の外径寸法の軸材を製作した。 A solid shaft material having an outer diameter of 300 mm at the center of the trunk portion was manufactured using S35C steel material as the shaft material 5 which is the most characteristic feature of the present invention. The shaft 5 is immersed in an aluminum molten metal bath at about 680 ° C. for about 1 hour, and then removed from the bath and subjected to heat treatment at 730 ° C. for about 3 hours. An alloy layer of 0.9 mm of iron and aluminum was obtained. Next, the outer diameter of the shaft member 5 was ground by about 0.5 mm to produce a shaft member having a predetermined outer diameter.
また、金属製スリーブ２ａ、２ｂ、２ｃおよび２ｄとして、ＳＵＳ３０４を用いて外径３２６ｍｍ、厚み１３ｍｍの中空円筒体を製作した。金属製スリーブの外径はセラミックス製スリーブのそれより小さくする。弾性部材３ａおよび３ｂとして、ＳＵＳ３０４を用いてリング状の皿バネを作製し、この皿バネを５枚直列に組み合わせて形成した。金属製締付部材４ａおよび４ｂとして、ＳＵＳ３０４を用いて内周面にねじ溝を形成した中空円筒体を製作した。 Further, as the metal sleeves 2a, 2b, 2c and 2d, hollow cylinders having an outer diameter of 326 mm and a thickness of 13 mm were manufactured using SUS304. The outer diameter of the metal sleeve is smaller than that of the ceramic sleeve. As the elastic members 3a and 3b, SUS304 was used to produce a ring-shaped disc spring, and five disc springs were combined in series. As the metal fastening members 4a and 4b, SUS304 was used to manufacture a hollow cylindrical body having a thread groove formed on the inner peripheral surface.
これらの部材を用いて、軸材５に３個のセラミック製スリーブ１ａ、１ｂおよび１ｃと、金属製スリーブ２ａ、２ｂ、２ｃおよび２ｄを嵌めて、その後、弾性部材３ａおよび３ｂを嵌めて、軸材５の胴部端部の外周面に設けたねじ部に、金属製締付部材４ａおよび４ｂをロール軸方向にねじ回転移動させ、弾性部材３ａおよび３ｂを伸縮させて、金属製スリーブ２ａおよび２ｂに側圧を付与し、セラミックス製スリーブを所定の位置に位置決め固定した。位置決め後、金属製締付部材４ａおよび４ｂのねじが緩まないように金属製締付部材４ａおよび４ｂを軸材５に固定した。 Using these members, three ceramic sleeves 1a, 1b and 1c and metal sleeves 2a, 2b, 2c and 2d are fitted to the shaft member 5, and then the elastic members 3a and 3b are fitted to the shaft member 5. The metal fastening members 4a and 4b are screwed and moved in the roll axis direction to the threaded portion provided on the outer peripheral surface of the end portion of the body portion of the material 5, and the elastic members 3a and 3b are expanded and contracted, so that the metal sleeve 2a and A side pressure was applied to 2b, and the ceramic sleeve was positioned and fixed at a predetermined position. After the positioning, the metal fastening members 4a and 4b were fixed to the shaft member 5 so that the screws of the metal fastening members 4a and 4b were not loosened.
そして、この本発明のセラミックス製ロールを実機ラインに長期間適用した結果、軸材の表面層が耐高温酸化性および耐食性に優れるため、軸材に錆が発生し難く、すなわち軸材の錆によるセラミックス製スリーブの内面からの破損を防止できた。また、セラミックス製スリーブは耐摩耗性および耐熱性が良好であるとともに、熱伝導率が５０W／（ｍ・Ｋ）以上であるためロール表面に亀裂は見られず耐熱衝撃性に優れることを確認できた。 As a result of applying the ceramic roll of the present invention to the actual machine line for a long time, the surface layer of the shaft material is excellent in high temperature oxidation resistance and corrosion resistance, so that the shaft material is less likely to rust, that is, due to the shaft material rust. The damage from the inner surface of the ceramic sleeve could be prevented. The ceramic sleeve has good wear resistance and heat resistance, and since it has a thermal conductivity of 50 W / (m · K) or more, it can be confirmed that there is no crack on the roll surface and it has excellent thermal shock resistance. It was.
本発明のセラミックス製ロールによれば、金属製軸材として比較的低合金で安価な炭素鋼もしくは低合金からなる構造用合金鋼などを用いても、軸材の表面層が耐高温酸化性および耐食性に優れるため、軸材に錆が発生し難く、ロール使用時の加熱と冷却の熱サイクルが加わった際にセラミックス製スリーブが割れることを防ぐことができる。 According to the ceramic roll of the present invention, even when a relatively low alloy and inexpensive carbon steel or structural alloy steel made of a low alloy is used as a metal shaft, the surface layer of the shaft is resistant to high-temperature oxidation and Since it is excellent in corrosion resistance, it is difficult for rust to be generated in the shaft material, and it is possible to prevent the ceramic sleeve from cracking when a heat cycle of heating and cooling during use of the roll is applied.
１ セラミックス製スリーブ、 １ａ（１ｂ、１ｃ） セラミックス製スリーブ、
２ａ（２ｂ、２ｃ、２ｄ） 金属製スリーブ、
３ａ（３ｂ） 弾性部材、
４ａ（４ｂ） 金属製締付部材、 ５ 軸材
1 Ceramic sleeve 1a (1b, 1c) Ceramic sleeve
2a (2b, 2c, 2d) metal sleeve,
3a (3b) elastic member,
4a (4b) Metal fastening member, 5 shaft material
Claims (4)
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| Application Number | Priority Date | Filing Date | Title |
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| JP2003413528A JP4292508B2 (en) | 2003-12-11 | 2003-12-11 | Ceramic roll |
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| Application Number | Priority Date | Filing Date | Title |
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| JP2003413528A JP4292508B2 (en) | 2003-12-11 | 2003-12-11 | Ceramic roll |
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| Publication Number | Publication Date |
|---|---|
| JP2005169462A JP2005169462A (en) | 2005-06-30 |
| JP4292508B2 true JP4292508B2 (en) | 2009-07-08 |
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| JP2003413528A Expired - Lifetime JP4292508B2 (en) | 2003-12-11 | 2003-12-11 | Ceramic roll |
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| JP (1) | JP4292508B2 (en) |
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| JP2005169462A (en) | 2005-06-30 |
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