JP2012052610A - Rolling device - Google Patents
Rolling device Download PDFInfo
- Publication number
- JP2012052610A JP2012052610A JP2010196114A JP2010196114A JP2012052610A JP 2012052610 A JP2012052610 A JP 2012052610A JP 2010196114 A JP2010196114 A JP 2010196114A JP 2010196114 A JP2010196114 A JP 2010196114A JP 2012052610 A JP2012052610 A JP 2012052610A
- Authority
- JP
- Japan
- Prior art keywords
- rolling device
- rolling
- polyhydric alcohol
- plant
- alcohol compound
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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- 239000011248 coating agent Substances 0.000 claims abstract description 27
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- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 30
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Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/52—Bearings with rolling contact, for exclusively rotary movement with devices affected by abnormal or undesired conditions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
- F16C19/34—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load
- F16C19/38—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers
- F16C19/383—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone
- F16C19/388—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with two or more rows of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone with four rows, i.e. four row tapered roller bearings
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
- Rolling Contact Bearings (AREA)
- Lubricants (AREA)
Abstract
Description
本発明は、内部空間に水分（水や水蒸気）が浸入する環境下で使用される、転がり軸受、リニアガイド装置、ボールねじ、直動ベアリングなどの転動装置に関し、特に発錆が生じにくい転動装置に関する。 The present invention relates to rolling devices such as rolling bearings, linear guide devices, ball screws, and linear motion bearings that are used in an environment where moisture (water or water vapor) enters the internal space. It relates to a moving device.
転動装置は、内方部材と、外方部材と、これらの間に転動自在に配された複数の転動体などから構成されるものである。例えば、転がり軸受や、リニアガイド装置、ボールねじ、直動ベアリングなどの直動装置などがある。直動装置は、工作機械や分析装置、搬送装置などの直動案内部に使用され、特に工作機械などに用いる場合は、冷却水が装置内部に進入する。 The rolling device is composed of an inner member, an outer member, and a plurality of rolling elements arranged so as to be able to roll between them. For example, there are linear motion devices such as rolling bearings, linear guide devices, ball screws, and linear motion bearings. The linear motion device is used in a linear motion guide unit such as a machine tool, an analysis device, or a conveyance device, and particularly when used in a machine tool or the like, cooling water enters the inside of the device.
多量の水と接触する厳しい環境で使用される転がり軸受として、例えば、鉄鋼製造設備の圧延機の圧延ロールを支持する圧延機ロールネック用転がり軸受が挙げられる。この圧延機ロールネック用転がり軸受では、ハウジングシールが装着されていても、軸受内部に圧延水や冷却水が侵入することが多い。また、ロール交換などのために数時間にわたって停止することや、定期的なロール研磨のために圧延機から軸受が取外されることがあり、その停止期間中に軸受内部で錆（いわゆる置き錆）が生じやすい。このような使用環境では、軸受寿命は、内部剥離による転動疲労寿命ではなく、錆を起点とした剥離等の損傷も含めて発錆により支配されている場合がある。 An example of a rolling bearing used in a harsh environment in contact with a large amount of water is a rolling mill roll neck rolling bearing that supports a rolling roll of a rolling mill of a steel production facility. In this rolling mill roll neck rolling bearing, even if a housing seal is mounted, rolling water or cooling water often enters the bearing. In addition, the bearing may be stopped for several hours for roll replacement or the rolling mill may be removed from the rolling mill for periodic roll polishing. ) Is likely to occur. In such a use environment, the bearing life may be dominated by rusting including damage such as peeling starting from rust, not the rolling fatigue life due to internal peeling.
従来、この置き錆などの発生を抑える手段として、例えば、保持器の全面に銅鍍金を施し、さらに保持器の大径端側の端部に銅鍍金の上から犠牲電極としての亜鉛鍍金を施したり、軸受内部にアルカリ水を供給したり、軸受内部に窒素ガスなどの低活性ガスやアルゴンガスなどの不活性ガスを充填させて、発錆を抑制する防錆手段を備えたものが提案されている（特許文献１参照）。また、圧延機ロールネック軸受の軸受寿命を延長すべく、外輪の転走面、内輪の転走面および転動体の表面の少なくとも一つの面にリン酸マンガン被膜等の化成処理膜を形成し、該化成処理膜における単位表面積あたりの結晶数を、発錆に起因する転がり軸受寿命から転動疲労に起因する転がり軸受寿命に遷移する領域における結晶数に設定したものが提案されている（特許文献２参照）。 Conventionally, as a means for suppressing the occurrence of such rusting, for example, copper plating is applied to the entire surface of the cage, and further, zinc plating as a sacrificial electrode is applied to the end of the large diameter end of the cage from above the copper plating. Proposed that has rust prevention means to suppress rusting by supplying alkaline water inside the bearing or filling the bearing with inert gas such as low active gas such as nitrogen gas or argon gas. (See Patent Document 1). In order to extend the bearing life of the rolling mill roll neck bearing, a chemical conversion treatment film such as a manganese phosphate coating is formed on at least one of the rolling surface of the outer ring, the rolling surface of the inner ring and the surface of the rolling element, In the proposed chemical conversion film, the number of crystals per unit surface area is set to the number of crystals in a region where the rolling bearing life caused by rusting transitions to the rolling bearing life caused by rolling fatigue has been proposed (Patent Literature). 2).
上記転がり軸受や直動装置において、内部での錆の発生を防止するために水分自体の侵入を防ぐシールを取り付けたとしても、完全に水分の侵入を防げるとは限らないので、水分が侵入しても発錆しないことが求められている。 In the above rolling bearings and linear motion devices, even if a seal is installed to prevent moisture from entering in order to prevent the occurrence of rust inside, moisture cannot be completely prevented. However, it is required not to rust.
また、過酷な条件で運転される圧延機ロールネック用転がり軸受の場合は、水の進入が多く、上記特許文献１や特許文献２の防錆手段では、十分な防錆性を確保できないおそれがある。また、リン酸マンガン被膜等の化成処理膜は腐食被膜であるため、軸受を構成する金属材料（母材）を若干侵食する。そのため、軸受の軌道面に化成処理を施した場合は、侵食の程度によってはその部分を起点とした剥離が生じ、化成処理を施していない場合の発錆寿命よりも短い時間で寿命に至る場合がある。
Further, in the case of a rolling mill roll neck rolling bearing operated under severe conditions, there is a large amount of water entering, and the anticorrosion means described in Patent Document 1 and
本発明はこのような問題に対処するためになされたものであり、水分が内部に浸入する環境下で使用されながら、錆の発生を抑制できる転動装置を提供することを目的とする。 The present invention has been made to cope with such problems, and an object of the present invention is to provide a rolling device that can suppress the generation of rust while being used in an environment where moisture enters the inside.
本発明の転動装置は、外面に軌道面を有する内方部材と、該内方部材の軌道面に対向する軌道面を有し上記内方部材の外方に配された外方部材と、上記両軌道面間に転動自在に配された複数の転動体とを備えてなる転動装置であって、該転動装置は、上記内方部材および上記外方部材で囲まれた内部空間に水分が浸入する環境下で使用されるものであり、上記内方部材、上記外方部材、および上記転動体の少なくとも一つが、金属製部材であり、該金属製部材の表面の少なくとも一部に、植物由来の多価アルコール化合物にて被膜処理が施されていることを特徴とする。 The rolling device of the present invention includes an inner member having a raceway surface on an outer surface, an outer member having a raceway surface facing the raceway surface of the inner member, and disposed on the outer side of the inner member; A rolling device comprising a plurality of rolling elements arranged to roll between the raceway surfaces, wherein the rolling device is an internal space surrounded by the inner member and the outer member. And at least one of the inner member, the outer member, and the rolling element is a metal member, and at least a part of the surface of the metal member. Further, the coating treatment is performed with a plant-derived polyhydric alcohol compound.
上記被膜処理を施された部材が、該部材の表面の少なくとも上記一部に酸化鉄被膜を有することを特徴とする。 The member subjected to the coating treatment has an iron oxide coating on at least a part of the surface of the member.
上記酸化鉄被膜は、膜厚が０．０５μｍ〜２μｍであることを特徴とする。 The iron oxide coating has a thickness of 0.05 μm to 2 μm.
上記被膜処理が、水および／または有機溶媒に上記植物由来の多価アルコール化合物を分散または溶解させた処理液中に、被膜処理を施す上記金属製部材を浸漬する処理であることを特徴とする。 The coating treatment is a treatment of immersing the metal member to be coated in a treatment solution in which the plant-derived polyhydric alcohol compound is dispersed or dissolved in water and / or an organic solvent. .
上記転動装置が、圧延機ロールネック用転がり軸受、または、直動装置であることを特徴とする。 The rolling device is a rolling bearing for a rolling mill roll neck or a linear motion device.
上記植物由来の多価アルコール化合物が、クロロゲン酸またはその誘導体であることを特徴とする。また、上記植物由来の多価アルコール化合物が、キナ酸またはその誘導体であることを特徴とする。また、上記植物由来の多価アルコール化合物が、没食子酸またはその誘導体であることを特徴とする。 The plant-derived polyhydric alcohol compound is chlorogenic acid or a derivative thereof. The plant-derived polyhydric alcohol compound is quinic acid or a derivative thereof. The plant-derived polyhydric alcohol compound is gallic acid or a derivative thereof.
上記植物由来の多価アルコール化合物が、コーヒー酸またはその誘導体であることを特徴とする。また、上記植物由来の多価アルコール化合物は、エラグ酸またはその誘導体であることを特徴とする。 The plant-derived polyhydric alcohol compound is caffeic acid or a derivative thereof. The plant-derived polyhydric alcohol compound is ellagic acid or a derivative thereof.
上記植物由来の多価アルコール化合物が、クルクミンまたはその誘導体であることを特徴とする。また、上記植物由来の多価アルコール化合物が、ケルセチンまたはその誘導体であることを特徴とする。 The plant-derived polyhydric alcohol compound is curcumin or a derivative thereof. The plant-derived polyhydric alcohol compound is quercetin or a derivative thereof.
本発明の転動装置は、内方部材、外方部材、および転動体の少なくとも一つが金属製部材であり、該金属製部材の表面の少なくとも一部に、植物由来の多価アルコール化合物にて被膜処理が施されているので、内方部材および外方部材で囲まれた内部空間に水分が浸入する環境下で使用されるものでありながら、装置内部の錆発生を抑制できる。また、表面処理に植物由来の多価アルコール化合物を用いるので、母材の侵食がほとんどなく、該処理部分を起点とした剥離が生じない。さらに、植物由来の多価アルコール化合物を用いるので、環境負荷の低い転動装置となる。 In the rolling device of the present invention, at least one of the inner member, the outer member, and the rolling element is a metal member, and at least a part of the surface of the metal member is made of a plant-derived polyhydric alcohol compound. Since the coating treatment is performed, rust generation inside the apparatus can be suppressed while being used in an environment where moisture enters the internal space surrounded by the inner member and the outer member. Moreover, since a plant-derived polyhydric alcohol compound is used for the surface treatment, there is almost no erosion of the base material, and no peeling occurs from the treated portion. Furthermore, since a plant-derived polyhydric alcohol compound is used, the rolling device has a low environmental load.
転動装置について、植物由来の多価アルコール化合物にて構成部材表面を処理したものを用いて、防錆性試験を行なったところ錆発生を抑制できることがわかった。これは、上記植物由来の多価アルコール化合物の作用により、金属製の部材表面に酸化鉄被膜が形成されて該表面が不活性化し、防錆効果をもつようになったものである。本発明はこのような知見に基づくものである。 About a rolling device, it turned out that rust generation | occurrence | production can be suppressed when the rust prevention test was done using what processed the surface of the structural member with the plant-derived polyhydric alcohol compound. This is because an iron oxide film is formed on the surface of the metal member due to the action of the plant-derived polyhydric alcohol compound, the surface is inactivated, and has a rust prevention effect. The present invention is based on such knowledge.
本発明の転動装置である転がり軸受を図１に基づいて説明する。図１は、本発明の転動装置の一例である圧延機ロールネック用転がり軸受を示す部分断面図である。図１に示すように、製鉄所に設置された圧延機のロールネックを回転自在に支承する複列円すいころ軸受１は、ロールネックに外嵌固定した内輪２（内方部材）と、ハウジングに内嵌固定した外輪３（外方部材）と、複数の円すいころ４と、これら円すいころ４を収容する複数のポケットを円周所定間隔で有する保持器５とを主要部として構成される。ここで、複数の円すいころ４は、内輪２の外周面に形成した軌道面２ａと、外輪３の内周面に形成され上記軌道面２ａと対向する軌道面３ａとの間に、転動自在に配されている。この複列円すいころ軸受１は、内輪２（内方部材）および外輪３（外方部材）で囲まれた内部空間６に圧延水や冷却水が浸入する環境下で使用され、軸方向両端部にハウジングシールが装着されていても、これらの進入を完全には防止できない。
A rolling bearing which is a rolling device of the present invention will be described with reference to FIG. FIG. 1 is a partial cross-sectional view showing a rolling bearing for a rolling mill roll neck that is an example of the rolling device of the present invention. As shown in FIG. 1, a double-row tapered roller bearing 1 that rotatably supports a roll neck of a rolling mill installed in a steel mill includes an inner ring 2 (inner member) that is fitted and fixed to the roll neck, and a housing. An outer ring 3 (outer member) that is fitted and fixed, a plurality of
内輪２、外輪３、および円すいころ４の少なくとも一つが、金属製部材であり、該金属製部材の表面の少なくとも一部に、植物由来の多価アルコール化合物にて被膜処理が施されている（図示省略）。また、発錆を抑制するため、保持器５の表面にも上記被膜処理を施すことが好ましい。
At least one of the
本発明の転動装置である直動装置を図２に基づいて説明する。図２は、本発明の転動装置（直動装置）の一例であるボールねじを示す断面図である。図２に示すように、本発明のボールねじ７は、内方部材であるねじ軸８の外周面に形成したねじ溝８ａ（軌道面）と、外方部材であるボールナット９の内周面に形成したねじ溝９ａ（軌道面）との間に、転動体である複数のボール１０を介在させたものである。ねじ軸８またはボールナット９の回転動力をボール１０を介してボールナット９（またはねじ軸８）に伝達し、ボールナット９を軸方向に移動させるものである。このボールねじ７は、ねじ軸８およびボールナット９で囲まれた内部空間に水が浸入する環境下で使用される。ねじ軸８、ボールナット９、およびボール１０の少なくとも一つが、金属製部材であり、該金属製部材の表面の少なくとも一部に、植物由来の多価アルコール化合物にて被膜処理が施されている（図示省略）。
A linear motion device which is a rolling device of the present invention will be described with reference to FIG. FIG. 2 is a cross-sectional view showing a ball screw which is an example of the rolling device (linear motion device) of the present invention. As shown in FIG. 2, the
本発明の転動装置の金属製部材の表面において、被膜処理を施す少なくとも一部は、特に限定されるものではない。該処理を施し、酸化鉄被膜を形成した箇所において発錆を抑制することができる。よって、少なくとも水分と接触する可能性のある部分には、該被膜処理を施すことが好ましい。装置内部全体の発錆を抑制するため、内部空間に係る全体面に上記被膜処理を施すことが最も好ましい。これらの被膜を処理を施し、発錆を抑制することで、上記転がり軸受や、直動装置を長寿命とすることができる。 On the surface of the metal member of the rolling device of the present invention, at least a part of the coating treatment is not particularly limited. Rusting can be suppressed at the place where the treatment is performed and the iron oxide film is formed. Therefore, it is preferable to perform the coating treatment on at least a portion that may come into contact with moisture. In order to suppress rusting of the entire inside of the apparatus, it is most preferable to perform the above-described coating treatment on the entire surface related to the internal space. By treating these coatings and suppressing rusting, the rolling bearing and the linear motion device can have a long life.
上記酸化鉄被膜は、膜厚が０．０５μｍ〜２μｍであることが好ましい。膜厚が０．０５μｍ未満であると、短時間で膜が剥れるなどにより、発錆を長期間にわたり抑制することができない。膜厚が２μｍをこえると、被膜形成の処理時間が長くなりすぎる。 The iron oxide film preferably has a thickness of 0.05 μm to 2 μm. If the film thickness is less than 0.05 μm, rusting cannot be suppressed over a long period of time due to the film peeling off in a short time. When the film thickness exceeds 2 μm, the processing time for film formation becomes too long.
なお、転動装置である転がり軸受として、円すいころ軸受である圧延機ロールネック用転がり軸受を挙げて説明したが、転がり軸受の種類は円すいころ軸受に限定されるものではない。本発明の転動装置は、例えば、深溝玉軸受、アンギュラ玉軸受、自動調心玉軸受、針状ころ軸受、円筒ころ軸受、自動調心ころ軸受等のラジアル形の転がり軸受や、スラスト玉軸受、スラストころ軸受等のスラスト形の転がり軸受も適用対象となる。また、転動装置である直動装置として、ボールねじを挙げて説明したが、直動装置の種類は、ボールねじに限定されるものではなく、リニアガイド装置、直動ベアリングなども適用対象となる。さらに、その他の種類の様々な転動装置に対しても適用可能である。 In addition, although the rolling bearing for rolling mill roll necks which is a tapered roller bearing was mentioned and demonstrated as a rolling bearing which is a rolling device, the kind of rolling bearing is not limited to a tapered roller bearing. The rolling device of the present invention includes, for example, radial rolling bearings such as deep groove ball bearings, angular ball bearings, self-aligning ball bearings, needle roller bearings, cylindrical roller bearings, and self-aligning roller bearings, and thrust ball bearings. Thrust-type rolling bearings such as thrust roller bearings are also applicable. In addition, a ball screw has been described as a linear motion device that is a rolling device, but the type of linear motion device is not limited to a ball screw, and linear guide devices, linear motion bearings, and the like are also applicable. Become. Furthermore, the present invention can also be applied to various other types of rolling devices.
本発明の転動装置に用いる、内方部材、外方部材、転動体、保持器などの部材は周知の金属材料からなる。本発明においては、少なくともいずれかの金属製部材が、植物由来の多価アルコール化合物による被膜処理が可能な金属材料から構成される必要がある。具体例として、軌道輪などの材料としては、軸受鋼（高炭素クロム軸受鋼ＪＩＳ Ｇ ４８０５）、肌焼鋼（ＪＩＳ Ｇ４１０４等）、高速度鋼（ＡＭＳ ６４９０）、ステンレス鋼（ＪＩＳ Ｇ４３０３）、高周波焼入鋼（ＪＩＳ Ｇ４０５１等）などが挙げられる。また、保持器材料としては、打ち抜き保持器用冷間圧延鋼板(ＪＩＳ Ｇ ３１４１等)、もみ抜き保持器用炭素鋼(ＪＩＳ Ｇ４０５１)、もみ抜き保持器用高力黄銅鋳物(ＪＩＳ Ｈ ５１０２等)などが挙げられる。また、他の合金を採用することもできる。 Members such as an inner member, an outer member, a rolling element, and a cage used in the rolling device of the present invention are made of a known metal material. In the present invention, at least one metal member needs to be made of a metal material that can be coated with a plant-derived polyhydric alcohol compound. Specific examples of the material for the bearing ring include bearing steel (high carbon chrome bearing steel JIS G 4805), case hardening steel (JIS G4104, etc.), high speed steel (AMS 6490), stainless steel (JIS G4303), high frequency. Hardened steel (JIS G4051 etc.) etc. are mentioned. Examples of cage materials include cold rolled steel plates for punching cages (JIS G 3141, etc.), carbon steel for machined cages (JIS G4051), high strength brass castings for machined cages (JIS H 5102, etc.), and the like. It is done. Other alloys can also be employed.
本発明の転動装置において、金属製部材の表面に施される被膜処理は、植物由来の多価アルコール化合物の作用により該面に酸化鉄被膜が形成される処理であればよく、被膜処理方法は特に限定されない。被膜処理方法として、例えば、植物由来の多価アルコール化合物を水および／または有機溶媒に分散または溶解させた処理液中に、被膜形成対象となる金属製部材を浸漬し、部材表面に酸化鉄被膜を形成させる方法を採用できる。この方法では、被膜形成を速めるため加温しながら行なうことが好ましい。 In the rolling device of the present invention, the coating treatment applied to the surface of the metal member may be a treatment in which an iron oxide coating is formed on the surface by the action of a plant-derived polyhydric alcohol compound. Is not particularly limited. As a coating method, for example, a metal member to be coated is immersed in a treatment liquid in which a plant-derived polyhydric alcohol compound is dispersed or dissolved in water and / or an organic solvent, and an iron oxide coating is formed on the surface of the member. It is possible to adopt a method of forming In this method, it is preferable to carry out heating while accelerating the film formation.
また、植物由来の多価アルコール化合物を、水や有機溶媒に分散または溶解させた処理液を、被膜形成対象となる金属製部材の表面などに塗布することによって該面に酸化鉄被膜を形成することもできる。 Further, an iron oxide film is formed on the surface of a metal member to be coated with a treatment liquid in which a plant-derived polyhydric alcohol compound is dispersed or dissolved in water or an organic solvent. You can also.
さらに、上記被膜処理は、グリースなどを介して施された処理であってもよい。すなわち、転動装置の内部空間に封入するグリースなどに、植物由来の多価アルコール化合物を配合して、転動装置使用時における該グリース中の該化合物と金属製部材との反応により酸化鉄被膜を形成することもできる。 Further, the coating treatment may be a treatment applied through grease or the like. That is, a plant-derived polyhydric alcohol compound is blended with grease or the like sealed in the internal space of the rolling device, and an iron oxide coating is formed by a reaction between the compound in the grease and a metal member when the rolling device is used. Can also be formed.
本発明において使用できる多価アルコール化合物は、後述する植物由来のものである。これらの化合物を用いた被膜処理を各部材に施すことで、上記酸化鉄被膜の形成による転動装置内部の錆発生の抑制に加え、環境負荷の低い転動装置となる。 The polyhydric alcohol compound that can be used in the present invention is derived from a plant described later. By applying a film treatment using these compounds to each member, in addition to suppressing the occurrence of rust inside the rolling device due to the formation of the iron oxide coating, the rolling device has a low environmental load.
本発明において使用できる植物由来の多価アルコール化合物としては、例えば、没食子酸、エラグ酸、クロロゲン酸、コーヒー酸、キナ酸、クルクミン、ケルセチン、ピロガロール、テアフラビン、アントシアニン、ルチン、リグナン、カテキンなどが挙げられる。また、植物由来のセサミン、イソフラボン、クマリンなどから得られる多価アルコール化合物も使用できる。以上のような多価アルコール化合物は、単独で用いても２種類以上を組み合わせて用いてもよい。 Examples of plant-derived polyhydric alcohol compounds that can be used in the present invention include gallic acid, ellagic acid, chlorogenic acid, caffeic acid, quinic acid, curcumin, quercetin, pyrogallol, theaflavin, anthocyanin, rutin, lignan, catechin and the like. It is done. Polyhydric alcohol compounds obtained from plant-derived sesamin, isoflavones, coumarins and the like can also be used. Such polyhydric alcohol compounds may be used alone or in combination of two or more.
これらの中で、被膜処理の際に、金属製部材表面に酸化鉄被膜を形成しやすいことから、没食子酸またはその誘導体、エラグ酸またはその誘導体、クロロゲン酸またはその誘導体、コーヒー酸またはその誘導体、キナ酸またはその誘導体、クルクミンまたはその誘導体、ケルセチンまたはその誘導体を用いることが好ましい。また、後述の実施例に示すように、被膜処理後の転動装置の防錆性に優れることから、クロロゲン酸、キナ酸、没食子酸が特に好ましく、次いでコーヒー酸、エラグ酸が好ましい。 Among these, since it is easy to form an iron oxide film on the surface of a metal member during the coating treatment, gallic acid or a derivative thereof, ellagic acid or a derivative thereof, chlorogenic acid or a derivative thereof, caffeic acid or a derivative thereof, It is preferable to use quinic acid or a derivative thereof, curcumin or a derivative thereof, quercetin or a derivative thereof. Moreover, as shown in the below-mentioned Examples, chlorogenic acid, quinic acid, and gallic acid are particularly preferable, and then caffeic acid and ellagic acid are preferable because the rolling device after coating is excellent in rust prevention.
本発明に用いる没食子酸は、フシノキ、茶の葉などに含まれる多価アルコール化合物であり、下記式（１）に示す構造を有する。また、本発明に用いるエラグ酸は、レッドラズベリーなどに含まれる多価アルコール化合物であり、下記式（２）に示す構造を有する。
本発明に用いる没食子酸の誘導体としては、没食子酸メチル、没食子酸エチル、没食子酸プロピル、没食子酸ブチル、没食子酸ペンチル、没食子酸ヘキシル、没食子酸ヘプチル、没食子酸オクチル等の没食子酸エステルや没食子酸ビスマス等の没食子酸塩が挙げられる。また、エラグ酸についても、同様の誘導体を用いることができる。 Derivatives of gallic acid used in the present invention include gallic acid esters such as methyl gallate, ethyl gallate, propyl gallate, butyl gallate, pentyl gallate, hexyl gallate, heptyl gallate, octyl gallate, and gallic acid. Examples thereof include gallates such as bismuth. Moreover, the same derivative can be used also about ellagic acid.
本発明に用いるクロロゲン酸は、コーヒー豆などに含まれる多価アルコール化合物であり、下記式（３）に示す構造を有する。
本発明に用いるコーヒー酸およびキナ酸は、クロロゲン酸の加水分解で得られる多価アルコール化合物であり、コーヒー酸は下記式（４）に、キナ酸は下記式（５）にそれぞれ示す構造を有する。
本発明に用いるクルクミンは、ウコンなどに含まれる多価アルコール化合物であり、下記式（６）に示す構造を有する。
本発明に用いるケルセチンは、柑橘類などに含まれる多価アルコール化合物であり、下記式（７）に示す構造を有する。
以下に示す各実施例に用いた多価アルコール化合物は、全て東京化成社製試薬を用いた。 All the polyhydric alcohol compounds used in the following examples used reagents manufactured by Tokyo Chemical Industry Co., Ltd.
実施例１〜実施例７
以下に実施例を示して、本発明をさらに具体的に説明する。圧延機ロールネック用の円すいころ軸受を用意して、錆発生までに要した時間を測定した。表１に示した多価アルコール化合物を水溶液または有機溶媒に溶解させ、０．５ｗｔ％に調製し処理液とした。室温（２５℃）で、該処理液中に円すいころ軸受を浸漬したまま４時間処理液を撹拌させ、円すいころ軸受の金属製部材（材質：ＳＵＪ２）の表面全体に酸化鉄被膜（膜厚：０．０８μｍ）を形成させた。得られた円すいころ軸受について以下に示す湿潤試験を行ない錆発生までに要した時間を測定した。結果を表１に併記する。
Examples 1 to 7
The present invention will be described more specifically with reference to the following examples. Tapered roller bearings for rolling mill roll necks were prepared, and the time required until rust occurred was measured. The polyhydric alcohol compound shown in Table 1 was dissolved in an aqueous solution or an organic solvent, adjusted to 0.5 wt%, and used as a treatment liquid. At room temperature (25 ° C.), the treatment liquid is stirred for 4 hours while the tapered roller bearing is immersed in the treatment liquid, and an iron oxide coating (film thickness: thickness) is formed on the entire surface of the metal member (material: SUJ2) of the tapered roller bearing. 0.08 μm) was formed. The obtained tapered roller bearing was subjected to the following wet test, and the time required until rust generation was measured. The results are also shown in Table 1.
＜湿潤試験＞
表面処理を施した円すいころ軸受を温度４９℃、相対湿度９５％以上の湿潤状態に保持し、円すいころ軸受における軌道面（内・外輪転走面）に錆が発生するまでの時間（時間、ｈ）を調査した。
<Wetting test>
The time until the rust is generated on the raceway surface (inner / outer ring rolling surface) of the tapered roller bearing by keeping the surface-treated tapered roller bearing in a wet state at a temperature of 49 ° C. and a relative humidity of 95% or more (hours, h) was investigated.
比較例１
実施例１と同様の円すいころ軸受に表面処理を施さずに湿潤試験を行ない、錆発生までに要した時間を測定した。結果を表１に併記する。
Comparative Example 1
The same tapered roller bearing as in Example 1 was subjected to a wet test without subjecting it to surface treatment, and the time required until the occurrence of rust was measured. The results are also shown in Table 1.
表１に示すように、実施例１〜７は、湿潤試験において錆発生までの時間が全て５００時間以上の優れた防錆性を示した。これは、特定の多価アルコール化合物により形成された酸化鉄被膜による錆発生が抑制できたことによると考えられる。特に、クロロゲン酸、キナ酸、没食子酸を用いた場合では、２０００時間以上の非常に優れた防錆性を示した。一方、比較例１では、実施例１〜７と比較して錆発生までの時間が大幅に短い結果となった。 As shown in Table 1, Examples 1 to 7 exhibited excellent rust prevention properties in which the time until rust generation in the wet test was 500 hours or more. This is considered to be because the generation of rust due to the iron oxide film formed from a specific polyhydric alcohol compound could be suppressed. In particular, when chlorogenic acid, quinic acid, and gallic acid were used, very excellent rust prevention property of 2000 hours or more was exhibited. On the other hand, in Comparative Example 1, the time until the occurrence of rust was significantly shorter than in Examples 1-7.
本発明の転動装置は、水分が内部に浸入した場合であっても長期間にわたり錆の発生を抑制できるので、内部空間に水分が浸入する環境下で使用される、転がり軸受、リニアガイド装置、ボールねじ、直動ベアリングなどの転動装置として好適に利用できる。 Since the rolling device of the present invention can suppress the generation of rust over a long period of time even when moisture enters the inside, the rolling bearing and linear guide device used in an environment where moisture enters the internal space It can be suitably used as a rolling device such as a ball screw or a linear motion bearing.
１ 複列円すいころ軸受（転動装置）
２ 内輪
３ 外輪
４ 円すいころ
５ 保持器
６ 内部空間
７ ボールねじ
８ ねじ軸
９ ボールナット
１０ ボール
1 Double row tapered roller bearing (rolling device)
2
Claims (13)
該転動装置は、前記内方部材および前記外方部材で囲まれた内部空間に水分が浸入する環境下で使用されるものであり、
前記内方部材、前記外方部材、および前記転動体の少なくとも一つが、金属製部材であり、該金属製部材の表面の少なくとも一部に、植物由来の多価アルコール化合物にて被膜処理が施されていることを特徴とする転動装置。 An inner member having a raceway surface on the outer surface, an outer member having a raceway surface opposite to the raceway surface of the inner member, and arranged on the outer side of the inner member, and rolling between the both raceway surfaces A rolling device comprising a plurality of freely arranged rolling elements,
The rolling device is used in an environment in which moisture enters an internal space surrounded by the inner member and the outer member,
At least one of the inner member, the outer member, and the rolling element is a metal member, and at least a part of the surface of the metal member is coated with a plant-derived polyhydric alcohol compound. The rolling device characterized by being made.
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