JPH08257479A - Coating method of rotor for rotary machine - Google Patents
Coating method of rotor for rotary machineInfo
- Publication number
- JPH08257479A JPH08257479A JP34326095A JP34326095A JPH08257479A JP H08257479 A JPH08257479 A JP H08257479A JP 34326095 A JP34326095 A JP 34326095A JP 34326095 A JP34326095 A JP 34326095A JP H08257479 A JPH08257479 A JP H08257479A
- Authority
- JP
- Japan
- Prior art keywords
- coating
- rotor
- resin
- temperature
- rotating body
- 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.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、スクリュー式、ルー
ツ式、ロータリー式等の過給機のロータのごとき回転機
械の回転体に合成樹脂被膜を形成するコーティング方法
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating method for forming a synthetic resin film on a rotating body of a rotary machine such as a rotor of a supercharger of a screw type, a roots type or a rotary type.
【０００２】[0002]
【従来の技術】内燃機関の吸気系に配置されるルーツ式
過給機の一対のロータは、ロータ相互間およびシリンダ
壁との間に微小の間隙をもって同期駆動される。このロ
ータ相互間の間隙をより小さくし、ポンプ効率を高める
ため、ロータの外周面に樹脂コーティングを施すことが
従来より知られている（例えば、実開昭５９−１７４３
８９号公報、特開昭６０−１７３３８７号公報など）。2. Description of the Related Art A pair of rotors of a roots type supercharger arranged in an intake system of an internal combustion engine are synchronously driven with a small gap between the rotors and a cylinder wall. It has been conventionally known that a resin coating is applied to the outer peripheral surface of the rotor in order to make the gap between the rotors smaller and to improve the pump efficiency (for example, Japanese Utility Model Laid-Open No. 59-1743).
89, JP-A-60-173387, etc.).
【０００３】通常、このようなロータに樹脂コーティン
グを施す場合は、コーティング液を圧縮空気を用いて霧
化し、治具に固定したロータに吹付けてコーティングを
行っていた。In general, when resin coating is applied to such a rotor, the coating liquid is atomized using compressed air and sprayed on the rotor fixed to a jig for coating.
【０００４】また、内燃機関の吸気系より侵入した異物
によって、ロータ母材が損傷を受けることを防止するた
め、コーティングの膜厚さを厚くすることが考えられる
が、膜厚さを厚くする方法としては重ね塗りが行われて
いた。Further, in order to prevent the rotor base material from being damaged by foreign matter that has entered from the intake system of the internal combustion engine, it is conceivable to increase the film thickness of the coating, but it is a method of increasing the film thickness. As for, it was overpainted.
【０００５】[0005]
【発明が解決しようとする課題】ロータの外周面に樹脂
コーティングが施されたルーツ式過給機の一対のロータ
は、吸気系に侵入した異物等によって、被覆が破壊され
吸気率が低下するという問題があった。A pair of rotors of a roots-type supercharger in which a resin coating is applied to the outer peripheral surface of the rotors is said to be damaged by foreign substances or the like that have entered the intake system, resulting in a reduction in the intake rate. There was a problem.
【０００６】これを解決するために、上述のようにコー
ティングの膜厚さを厚くして異物を埋没させることが有
効であると考えられるが、従来から行われているコーテ
ィング方法では、１回の焼成工程で２０〜３０μｍの薄
い膜しか得られなかった。１回の焼成工程で膜厚８０μ
ｍ以上を形成するようコーティング液の粘度を高くして
被覆を行うと、ロータの谷部にコーティング液が集中
し、その結果、谷部の膜厚さが極端に厚くなりコーティ
ング面に割れ、粗れ、発泡等が生じる問題があった。In order to solve this, it is considered effective to increase the thickness of the coating to bury the foreign matter as described above. However, in the conventional coating method, the coating is performed once. Only a thin film of 20 to 30 μm was obtained in the baking process. 80μ film thickness in one firing process
If coating is performed with a high viscosity of the coating liquid to form m or more, the coating liquid concentrates in the valley portion of the rotor, and as a result, the film thickness of the valley portion becomes extremely thick and the coating surface is cracked and rough. There is a problem that foaming occurs.
【０００７】このような欠点を解決する手段としては、
ロータに２０μｍ程度の薄い膜を形成したのち、乾燥工
程や焼成工程を施しその後同じ工程を繰り返し、膜厚さ
１００μｍに形成していく重ね塗りする方法もある。As a means for solving such a drawback,
There is also a method in which a thin film of about 20 μm is formed on a rotor, a drying process and a baking process are performed, and then the same process is repeated to form a film thickness of 100 μm.
【０００８】しかし、重ね塗りではコーティングが層状
になるため、一対のロータ及びロータとシリンダ間に干
渉があると、コーティング層が層間剥離を起こすことも
考えられ、また、ポンプ効率が低下するという問題もあ
る。However, since the coating is layered in overcoating, if there is interference between the pair of rotors and the rotor and the cylinder, the coating layer may be delaminated, and the pump efficiency is lowered. There is also.
【０００９】一方、コーティング液の粘度が低すぎる
と、乾燥、焼成時の溶剤の揮発が激しく、所望の膜厚さ
を得られないという問題があった。On the other hand, if the viscosity of the coating liquid is too low, there is a problem that the solvent volatilizes vigorously during drying and baking, and a desired film thickness cannot be obtained.
【００１０】また、ロータを回転させながらスプレーコ
ーティング法によりコーティングを行っても、その乾燥
工程ではロータを熱風循環式電気炉に入れロータを回転
させずに乾燥させていたので、潤滑材入りの溶剤が完全
に揮発するまでの時間（例えば１０分間）の乾燥時間中
に、コーティング液は少しずつロータの下面に向って流
れ出す。そのため、電気炉内に設置して乾燥工程に入っ
た際に、ロータの下部の膜厚さが上部の膜厚さより若干
厚くなり、その結果膜厚さが不均一となる。Further, even if the coating is carried out by the spray coating method while rotating the rotor, in the drying step, the rotor is put in the hot air circulation type electric furnace to dry without rotating the rotor, so that the solvent containing the lubricant is used. The coating liquid gradually flows out toward the lower surface of the rotor during the drying time for completely evaporating (eg, 10 minutes). Therefore, when the rotor is installed in the electric furnace and the drying process is started, the film thickness of the lower part of the rotor becomes slightly thicker than that of the upper part, and as a result, the film thickness becomes non-uniform.
【００１１】過給機のロータとハウジングとのすき間
は、およそ０．１ｍｍであるから、ロータが高速回転し
てしなりが発生すると、ロータとハウジングとの間に干
渉等の不具合が発生するおそれがる。また、空気ポンプ
の役目を果すルーツ式過給機では、作動時に独特な吸排
気音を発生する原因ともなる。Since the clearance between the rotor and the housing of the supercharger is about 0.1 mm, if the rotor rotates at a high speed and the bending occurs, a trouble such as interference may occur between the rotor and the housing. Get up. In addition, the roots-type supercharger, which plays the role of an air pump, causes a peculiar intake / exhaust sound during operation.
【００１２】一方、スクリュー式過給機では、前記のル
ーツ式過給機の作動時に発生する独特な吸排気音の発生
は少ないが、一組の互いに滑らかに噛み合う一対のスク
リューの形状に加工することは、非常に困難であると共
に、コストも高くつく。On the other hand, in the screw type supercharger, although a peculiar intake / exhaust sound is not generated when the roots type supercharger is operated, the screw type supercharger is processed into a shape of a pair of screws smoothly meshing with each other. This is very difficult and costly.
【００１３】そのため、粉体塗装法によりスクリューに
フッ素系樹脂粉末を付着させることにしても、精度を維
持するために、もう一度困難なスクリュー形状に加工し
なければならず、非常にコストが高くなってしまう。Therefore, even if the fluorine-based resin powder is adhered to the screw by the powder coating method, it is necessary to process the screw into a difficult screw shape again in order to maintain the accuracy, and the cost becomes very high. Will end up.
【００１４】また、上記の粉体塗装法によると、スクリ
ューにはネジの根元にあたる螺旋状の角溝部があるの
で、この角溝部内にまで均一に粉体樹脂層を形成するこ
とは、解決すべき点が残されている。Further, according to the above-mentioned powder coating method, the screw has a spiral angular groove portion at the base of the screw. Therefore, forming the powder resin layer evenly in this angular groove portion can be solved. There is a point to be left.
【００１５】粉体塗装法によると、スクリューを樹脂の
融点よりも高い温度にまで加熱し、その加熱されたスク
リューを樹脂粉末の入った槽に浸漬して融けた樹脂を付
着させるのであるが、冷却時に樹脂層が収縮し、スクリ
ューの角溝部と樹脂層との密着性が低下し、収縮量の多
い樹脂層ではいわゆるブリッジ現象が発生するおそれも
ある。According to the powder coating method, the screw is heated to a temperature higher than the melting point of the resin, and the heated screw is immersed in a tank containing the resin powder to adhere the molten resin. During cooling, the resin layer shrinks, the adhesion between the angular groove of the screw and the resin layer decreases, and a so-called bridge phenomenon may occur in the resin layer with a large amount of shrinkage.
【００１６】なお、以上述べた問題点は機械式過給機の
ロータやスクリューに限らず、ポンプ等の回転機械一般
の回転体においても同様である。The above-mentioned problems are not limited to the rotor and the screw of the mechanical supercharger, and the same applies to a rotating body of a rotary machine such as a pump.
【００１７】そこで、この発明はこのような回転体につ
いて、前述のごとき問題点を解決することを目的とす
る。Therefore, an object of the present invention is to solve the above-mentioned problems in such a rotating body.
【００１８】[0018]
【課題を解決するための手段】上記の目的を達成するた
めにこの発明は、回転機械の回転体の外表面に合成樹脂
被膜を形成するコーティング方法において、所定の温度
に加熱した回転体を所定の回転数で回転させつつ、固形
潤滑材と、結着性樹脂との混合樹脂に溶剤を加えてなる
所定温度のコーティング液を、上記回転体の外表面にス
プレーコート法により被覆して被膜を形成すると同時に
乾燥させて溶剤を除去し、その後該被膜を所定の温度で
焼成するようにしたものである。In order to achieve the above object, the present invention is a coating method for forming a synthetic resin film on the outer surface of a rotating body of a rotating machine, wherein a rotating body heated to a predetermined temperature is set to a predetermined temperature. While rotating at a rotation speed of, a coating liquid at a predetermined temperature, which is prepared by adding a solvent to a mixed resin of a solid lubricant and a binder resin, is coated on the outer surface of the above-mentioned rotating body by a spray coating method to form a film. The film is formed and dried at the same time to remove the solvent, and then the film is baked at a predetermined temperature.
【００１９】上記コーティング液の固形潤滑材と結着性
樹脂との混合樹脂は５〜６０重量％（溶剤９５〜４０重
量％）好ましくは２０〜３５重量％（溶剤８０〜６５重
量％）とする。コーティング液の混合樹脂が５重量％未
満であると回転体表面に十分な樹脂が付着せず、溶剤も
無駄になりやすい。６０重量％を越えると、固形分量が
多すぎるので、スプレーガン等の霧化手段のノズルの液
づまりの原因となりやすい。The mixed resin of the solid lubricant and the binder resin in the coating liquid is 5 to 60% by weight (solvent 95 to 40% by weight), preferably 20 to 35% by weight (solvent 80 to 65% by weight). . If the mixed resin of the coating liquid is less than 5% by weight, sufficient resin does not adhere to the surface of the rotating body and the solvent is likely to be wasted. If it exceeds 60% by weight, the amount of solid content is too large, which is apt to cause liquid clogging of the nozzle of the atomizing means such as a spray gun.
【００２０】また、混合樹脂のうち、固形潤滑材は５〜
９５重量％、結着性樹脂を９５〜５重量％とする。この
配合量は、回転体の使用条件、例えば潤滑油等の潤滑
材、グリース潤滑、無潤滑等の潤滑条件或いは耐熱性、
摩擦・摩耗特性等の仕様等に基づき決定する。好ましく
は、固形潤滑材は１５〜８５重量％、結着性樹脂は８５
〜１５重量％である。固形潤滑材が５重量％未満である
と摺動特性が期待できず、一方結着性樹脂が５重量％未
満であると回転体への樹脂層の結着性が不安定となる。In the mixed resin, the solid lubricant is 5
95% by weight, and the binder resin is 95 to 5% by weight. This blending amount is based on the usage conditions of the rotating body, such as a lubricant such as lubricating oil, grease lubrication, non-lubrication, or heat resistance,
Determine based on specifications such as friction and wear characteristics. Preferably, the solid lubricant is 15 to 85% by weight and the binder resin is 85% by weight.
~ 15% by weight. If the solid lubricant content is less than 5% by weight, sliding characteristics cannot be expected, while if the binding resin content is less than 5% by weight, the binding property of the resin layer to the rotor becomes unstable.
【００２１】また、例えば、結着性樹脂は、架橋特性を
有する樹脂材であることが好ましい。架橋特性によって
燃成時に回転体の基材である下地材料とフッ素系樹脂と
を良好に密着させることができる。Further, for example, the binder resin is preferably a resin material having a crosslinking property. Due to the cross-linking property, the base material, which is the base material of the rotating body, and the fluororesin can be favorably adhered to each other during combustion.
【００２２】コーティング液の温度は５〜８０℃とす
る。５℃〜常温の温度範囲でコーティング液の粘度が低
くなり、液だれの発生を防ぐことができる。また、常温
〜８０℃の温度範囲で溶剤の蒸発温度との差が少なくな
り、コーティングの乾燥時間が短縮され、液だれの発生
を防ぐことができる。ここでいう常温とは、１０〜４０
℃、具体的には２０〜２５℃をさす。The temperature of the coating liquid is 5 to 80 ° C. In the temperature range of 5 ° C. to room temperature, the viscosity of the coating liquid becomes low and the occurrence of dripping can be prevented. Further, in the temperature range of room temperature to 80 ° C, the difference from the evaporation temperature of the solvent is reduced, the drying time of the coating is shortened, and dripping can be prevented. The normal temperature here is 10-40
C., specifically 20 to 25.degree.
【００２３】固形潤滑材としては、黒鉛等の炭素系粉
末、二硫化モリブデン等のモリブデン系粉末、フッ素系
樹脂粉末等が挙げられる。フッ素系樹脂は、例えば、次
のものが挙げられる。〔 〕内は各々の樹脂の融点であ
る。Examples of the solid lubricant include carbon-based powder such as graphite, molybdenum-based powder such as molybdenum disulfide, and fluorine-based resin powder. Examples of the fluorine-based resin include the following. The value in [] is the melting point of each resin.
【００２４】・ポリテトラフルオロエチレン（ＰＴＦ
Ｅ）〔約３２７℃〕 ・テトラフルオロエチレン−ヘキサフルオロプロピレン
共重合体（ＦＥＰ）〔約２６０〜２７０℃〕 ・テトラフルオロエチレン−パーフルオロアルキルビニ
ルエーテル共重合体（ＰＦＡ）〔約３００〜３１０℃〕 ・エチレン−テトラフルオロエチレン共重合体（ＥＴＦ
Ｅ）〔約２６０〜２７０℃〕 等があり、またこれらの共重合体や３元共重合体等のフ
ルオロポリオレフィン等でもよいが、好ましくはＰＴＦ
Ｅである。ＰＴＦＥは、前記フッ素系樹脂の中でも最も
融点が高く、また溶融時の粘度も非常に高いので、高温
となるような摺動面部の摺動材として好適であり、前記
結着性樹脂の焼成時の高温にも充分に耐えうる。また、
ＰＦＡも溶融時の粘度はＰＴＦＥよりも低いが、使用し
てもよい。前記のフッ素樹脂は１種類だけではなく、被
膜回復率や弾性等を改善するために１０〜５０重量部程
度の範囲で２種類以上を適宜混合してもよい。.Polytetrafluoroethylene (PTF
E) [about 327 ° C.] tetrafluoroethylene-hexafluoropropylene copolymer (FEP) [about 260 to 270 ° C.] tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA) [about 300 to 310 ° C.] -Ethylene-tetrafluoroethylene copolymer (ETF
E) [about 260 to 270 ° C.] and the like, and a fluoropolyolefin such as a copolymer or a terpolymer of these may be used, but PTF is preferable.
It is E. Since PTFE has the highest melting point among the above-mentioned fluororesins and has an extremely high viscosity when melted, it is suitable as a sliding material for the sliding surface portion that is heated to a high temperature, and when the binder resin is baked. Can withstand high temperatures. Also,
PFA also has a lower viscosity when melted than PTFE, but may be used. The fluororesin is not limited to one type, and two or more types may be appropriately mixed in the range of about 10 to 50 parts by weight in order to improve the film recovery rate, elasticity, and the like.
【００２５】このなかでもテトラフルオロエチレン系フ
ッ素樹脂は、繰り返しの分子構造単位中に−（ＣＦ2 −
ＣＦ2 ）−の繰り返し単位を含むので、耐熱性、摺動性
に優れ、さらに、ＰＴＦＥ、ＰＦＡ、ＦＥＰ等のパーフ
ルオロ系テトラフルオロエチレン樹脂は、骨格である炭
素の周囲が全てフッ素で取り囲まれたもの、あるいは微
量の酸素を介して全てフッ素で取り囲まれたもので、フ
ッ素によって炭素骨格が完全に保護され、またＣ−Ｆ間
の強い結合により、耐熱性、低摩擦係数に加え、耐薬品
性、耐油性等にも優れていると考えられる。Among them, the tetrafluoroethylene-based fluororesin has-(CF 2-) in the repeating molecular structural unit.
Since it contains a repeating unit of CF 2 )-, it has excellent heat resistance and slidability. Furthermore, in the perfluoro-based tetrafluoroethylene resin such as PTFE, PFA, FEP, etc., the skeleton carbon is entirely surrounded by fluorine. Or carbon dioxide skeleton completely surrounded by fluorine through a trace amount of oxygen, the carbon skeleton is completely protected by fluorine, and due to the strong bond between C and F, in addition to heat resistance, low friction coefficient, chemical resistance It is also considered to have excellent properties and oil resistance.
【００２６】結着性樹脂としては、エポキシ系樹脂、フ
ェノール系樹脂、ポリイミド系樹脂等の熱硬化性樹脂が
挙げられ、ポリフェニレンサルファイド系樹脂等のポリ
アリーレンサルファイド系樹脂、ポリアミドイミド系樹
脂や熱可塑性ポリイミド系等のポリイミド系樹脂等の熱
可塑性樹脂でもよく、架橋特性を有する材料が好まし
い。また、これらの樹脂をそれぞれ２種類以上を５〜１
５重量部ごとに混合して使用することもできる。このよ
うにして、形成された被膜を過給機等の回転式ポンプの
少なくとも摺動面に設けることにより、摩擦摩耗性、耐
熱性、シール性等の諸特性を備えた回転体を提供するこ
とができるようになると考えられる。Examples of the binder resin include thermosetting resins such as epoxy resins, phenol resins and polyimide resins. Polyarylene sulfide resins such as polyphenylene sulfide resins, polyamide imide resins and thermoplastic resins. A thermoplastic resin such as a polyimide resin such as a polyimide resin may be used, and a material having a crosslinking property is preferable. In addition, two or more kinds of each of these resins are used for 5 to 1
It is also possible to mix and use every 5 parts by weight. By providing the coating film thus formed on at least the sliding surface of a rotary pump such as a supercharger, it is possible to provide a rotating body having various characteristics such as friction and wear resistance, heat resistance, and sealability. It will be possible to
【００２７】溶剤としては、例えば次のような有機溶剤
などを用いることができる。As the solvent, for example, the following organic solvents can be used.
【００２８】・アセトン、メチルケトン等のエトン類 ・酢酸メチル、酢酸エチル等のエステル類 ・キシレン類、トルエン類の芳香族炭化水素類 ・メチルクロロホルム、トリクロロエチレン、トリクロ
ロトリフルオロエタン等の有機ハロゲン物 ・Ｎ−メチル−ピロリドン（ＮＭＰ）、メチル−イソ−
ピロリドン（ＭＩＰ）の単独又はこれらの混合物（例え
ば、ＮＭＰを４０〜５０重量部、ＮＩＰを２０〜３０重
量部）、またこれらにキシレンを約５〜１５重量部加え
ても良く、周囲の温度や湿度等の環境に応じて、これら
の輝発性溶剤を適宜配合してもよい。Ethones such as acetone and methyl ketone, Esters such as methyl acetate and ethyl acetate, Aromatic hydrocarbons such as xylene and toluene, Organic halogens such as methyl chloroform, trichloroethylene, trichlorotrifluoroethane, etc. -Methyl-pyrrolidone (NMP), methyl-iso-
Pyrrolidone (MIP) alone or in a mixture thereof (for example, 40 to 50 parts by weight of NMP and 20 to 30 parts by weight of NIP), and about 5 to 15 parts by weight of xylene may be added thereto, depending on the ambient temperature and You may mix | blend these brightening solvents suitably according to environment, such as humidity.
【００２９】被膜の焼成温度は１８０〜２８０℃が適当
である。１８０℃未満であると結着性樹脂の架橋が進行
せず、混合樹脂被膜の回転体に対する密着性が期待でき
ない。２８０℃を越えると、特にフッ素系樹脂の融点を
越えると、フッ素系樹脂の分解が進み始めるので好まし
くなく、アルミニウム合金等の基材の耐熱性も考慮して
フッ素系樹脂の融点よりも約３０〜１００℃以下、好ま
しくは約５０〜１００℃以下の温度で焼成することがよ
い。The firing temperature of the coating is suitably 180 to 280 ° C. If the temperature is lower than 180 ° C., the crosslinking of the binder resin does not proceed, and the adhesion of the mixed resin coating to the rotating body cannot be expected. If the temperature exceeds 280 ° C., especially if it exceeds the melting point of the fluorine-based resin, the decomposition of the fluorine-based resin begins to proceed, which is not preferable. Considering the heat resistance of the base material such as an aluminum alloy, the melting point of the fluorine-based resin is about 30% or more. It is preferable to perform firing at a temperature of -100 ° C or lower, preferably about 50-100 ° C or lower.
【００３０】焼成時は、所定の温度に達する前に、例え
ば常温〜８０℃〜１３０℃〜１８０℃〜２３０℃〜２８
０℃というように数段階に分け、１５分〜１８０分の範
囲内で１５分〜６０分ごとに徐々に昇温させることによ
り、結着性樹脂のキュアが徐々に確実に進行し、均一な
密着強度を有する被膜を形成することができる。また、
被膜にちぢみ、しわ、わき、われ等の発生を防ぐことも
できる。At the time of firing, before reaching a predetermined temperature, for example, room temperature-80 ° C-130 ° C-180 ° C-230 ° C-28.
The temperature of the binder resin is divided into several steps, and the temperature of the binder resin is gradually raised within the range of 15 minutes to 180 minutes every 15 minutes to 60 minutes, whereby the curing of the binder resin gradually progresses reliably and uniformly. A film having adhesion strength can be formed. Also,
It is also possible to prevent the film from being crinkled, wrinkled, crumpled, cracked or the like.
【００３１】焼成時の最高温度の保持時間は、１５〜６
０分、好ましくは３０〜４５分の範囲であればよい。最
高温度の保持時間が１５分未満の短時間では結着性樹脂
のキュアが不安定で、６０分を越える長時間ではアルミ
ニウム合金等の軽量鋳物金属系合金等でなる回転体への
熱的影響（例えば、ソリの発生等）が心配され、また電
気炉の消費電力量も多くなる。更に製造工程の時間も長
くなり、コスト低減につながらない。The maximum temperature holding time during firing is 15 to 6
It may be 0 minutes, preferably 30 to 45 minutes. When the maximum temperature is held for less than 15 minutes, the curing of the binder resin is unstable, and for more than 60 minutes, the thermal effect on the rotor made of lightweight cast metal alloys such as aluminum alloys. (For example, warpage is generated), and the electric power consumption of the electric furnace increases. Further, the manufacturing process takes a long time, which does not lead to cost reduction.
【００３２】具体的には、焼成温度は、被覆物が機械式
過給機のロータのようなアルミニウム合金のため、アル
ミニウム合金の熱によるソリ等の内部歪の発生や強度変
化、材質変化等の発生を、極力防ぎ、尚かつ充分な被膜
と被覆物との密着強度を得るために、約２３０℃で行う
とよい。Specifically, since the coating temperature is such that the coating material is an aluminum alloy such as the rotor of a mechanical supercharger, internal strain such as warpage due to heat of the aluminum alloy, strength change, material change, etc. In order to prevent the generation as much as possible and to obtain a sufficient adhesion strength between the coating film and the coating material, it is preferable to carry out at about 230 ° C.
【００３３】このようにアルミニウム合金で軸方向長さ
や半径方向長さが約８０mm〜２２０mm以上、外径が約２
０mm〜１２０mm以上の長さのアルミニウム合金製被覆物
に、前記混合樹脂を被覆し、焼成する場合は、焼成温度
は、約１８０℃〜約２４０℃の範囲内程度にとどめるほ
うがより好ましい。As described above, the aluminum alloy has an axial length and a radial length of about 80 mm to 220 mm or more and an outer diameter of about 2 mm.
When the aluminum alloy coating having a length of 0 mm to 120 mm or more is coated with the mixed resin and fired, the firing temperature is more preferably kept within the range of about 180 ° C to about 240 ° C.
【００３４】尚、図１のような回転体に、例えば金属製
軸芯棒が、貫通保持されていれば、補強となり一層、ソ
リ等は発生しにくく好ましい。It should be noted that if a metal mandrel, for example, is held through the rotating body as shown in FIG. 1, it will serve as a reinforcement and warp will be less likely to occur, which is preferable.
【００３５】また、昇温時には９０〜１２０℃で１５〜
６０分間昇温を一時停止し一定温度に保持させるように
してもよい。これは、予備乾燥後の樹脂被膜内に極くわ
ずかの水分等の溶剤が含まれていた場合、その溶剤を被
膜から完全に乾燥させて、その後に焼成に移るようにす
るためである。When the temperature is raised, the temperature is 90 to 120 ° C. and the temperature is 15 to
The temperature rise may be temporarily stopped for 60 minutes and kept at a constant temperature. This is because when the resin film after preliminary drying contains a solvent such as a very small amount of water, the solvent is completely dried from the film and then the baking is performed.
【００３６】短時間で急激に加熱して被膜を焼成しよう
とすると前記の水分等の溶剤が沸点を越えて気化し、蒸
発しようとする時に体積が膨張し、被膜に泡状の膨れや
穴等のいわゆる「はじき」「へこみ」「わき」「われ」
「ふくれ」等の不具合が発生するが、前述のように、徐
々に一定時間の間で一定温度に保持しその後に焼成工程
に移るようにすることにより、このような不具合の発生
を防ぐことができる。When the coating is baked by heating rapidly in a short time, the solvent such as water content is vaporized beyond the boiling point, and the volume is expanded when the coating is evaporated, and the coating is foamed or bulged. So-called "hajiki""dent""side""wa"
Although problems such as “blisters” occur, as described above, it is possible to prevent such problems by gradually maintaining the temperature at a constant temperature for a certain period of time and then moving to the firing step. it can.
【００３７】焼成工程後の冷却は、前記上昇時と逆の段
階を経て冷却してもよく、また６０〜１８０分程度の時
間をかけて連続的に徐冷してもよい。このように徐冷す
ることにより被膜と被覆物とが互いに均一に精度よく収
縮し、精度の高い被覆回転体を提供することができる。
焼成時間は、前記各温度段階を含んだ時間として、約２
〜１０時間に調整すればよい。The cooling after the firing step may be carried out through a step opposite to the above-described rising time, or may be continuously gradually cooled over a period of about 60 to 180 minutes. By gradually cooling in this way, the coating film and the coating material contract uniformly and with high precision, and a highly precise coated rotating body can be provided.
The firing time is about 2 including the above temperature steps.
It may be adjusted to 10 hours.
【００３８】上記工程でできる被膜の厚みは、約８０〜
１３０μｍ程度が適当である。被膜が薄すぎると異物の
埋没性や、運転初期のなじみ摩耗量分が不足し、厚すぎ
ると被膜が剥離することも予想される。The thickness of the film formed in the above process is about 80-
About 130 μm is suitable. It is expected that if the coating is too thin, the embeddability of foreign matter and the amount of familiar wear at the beginning of operation will be insufficient, and if it is too thick, the coating will peel off.
【００３９】ロータの回転数は特に限定しないが、ロー
タの回転数を約５〜１８０ｒｐｍとすることにより、ス
プレーで霧化された混合液の微粒子がロータの各角部、
例えばスクリュー形ロータの谷部の角部にまでも均一に
付着することになり、ロータの谷部から山部まで均一な
膜厚を有する被覆をロータの全周にわたって形成するこ
とになる。Although the number of revolutions of the rotor is not particularly limited, by setting the number of revolutions of the rotor to about 5 to 180 rpm, the fine particles of the mixed liquid atomized by the spray are applied to the respective corners of the rotor.
For example, even the corners of the valleys of the screw-shaped rotor are evenly adhered, and a coating having a uniform film thickness is formed over the entire circumference of the rotor from the valleys to the peaks of the rotor.
【００４０】回転数が約５ｒｐｍ未満では、膜厚が不均
一となりやすく、回転体の外径にもよるが、約５〜１２
０ｒｐｍとし、前記回転数を超えると遠心力等により、
コーティング液が周囲に飛散してりして、周囲が汚れる
ことになり、また、コーティング液も効率よく回転体に
付着せず、液が無駄になると考えられる。When the rotation speed is less than about 5 rpm, the film thickness is likely to be non-uniform, and depending on the outer diameter of the rotating body, it is about 5-12.
At 0 rpm, if the number of revolutions exceeds the above value, centrifugal force will cause
It is considered that the coating liquid is scattered around and the surroundings are contaminated, and the coating liquid does not efficiently adhere to the rotating body, so that the liquid is wasted.
【００４１】尚、正逆回転する場合に、回転は一瞬停止
するが本発明の回転数は少なくとも１回転以上の連続回
転時の回転むらが±１０％以内の範囲内である場合であ
ればよい。In the case of normal and reverse rotation, the rotation is stopped for a moment, but the number of rotations of the present invention may be such that the rotation unevenness during continuous rotation of at least one rotation is within ± 10%. .
【００４２】また、本発明で使用するコーティング装置
のスプレーガンのノズル口径は、０．８〜１．６mm程度
で良く、好ましくは、１．０〜１．２mmである。ノズル
口径が０．８mm未満では、なかでも１．０mm未満では、
固形物等による液粘度等により、ノズルがつまりやす
い。The nozzle diameter of the spray gun of the coating apparatus used in the present invention may be about 0.8 to 1.6 mm, preferably 1.0 to 1.2 mm. If the nozzle diameter is less than 0.8 mm, especially less than 1.0 mm,
The nozzle is likely to be clogged due to liquid viscosity due to solid matter or the like.
【００４３】ノズル口径が、１．６mmを超えるもの、な
かでも１．２mmを超えると、スプレー時に塗布用液が、
微細な粒子となりづらく、均一な被膜形成に期待できな
い。If the nozzle diameter exceeds 1.6 mm, and especially 1.2 mm, the coating liquid during spraying becomes
Since it is difficult to form fine particles, it cannot be expected to form a uniform film.
【００４４】尚、回転体の基材としては、例えば、アル
ミニウム合金のように錆びにくく密度が約２．７ｇ／ｃ
ｍ3 のような軽量非合金を選べばよい。回転体は比較的
高速回転するので、その慣性の影響は大きく、市場でも
軽量であることが、希望されており、密度が約１．５〜
５ｇ／ｃｍ3 以下、好ましくは約１．５〜３ｇ／ｃｍ3
以下のアルミニウム系、マグネシウム系、チタン系等の
軽量非鉄系合金であることが好ましい。The base material of the rotating body is, for example, aluminum alloy, which is unlikely to rust and has a density of about 2.7 g / c.
Choose a lightweight non-alloy such as m 3 . Since the rotating body rotates at a relatively high speed, the influence of its inertia is large, and it is hoped that the rotating body will be lightweight in the market.
5 g / cm 3 or less, preferably about 1.5 to 3 g / cm 3
The following lightweight non-ferrous alloys such as aluminum, magnesium and titanium are preferable.
【００４５】[0045]
【実施例】以下に、実施例について述べる。EXAMPLES Examples will be described below.
【００４６】図１は、本発明に係わるコーティング方法
の一例である。機械式過給機のアルミニウム製ロータ等
の所定の幅の外径寸法の回転体１を被覆用治具３に取り
付ける。回転用モータ２等の駆動手段で回転させ、回転
体１の一方をヒータ５で加熱しながら、ノズル口径１ｍ
ｍのスプレーガン４にて所定のコーティング液を回転体
の軸方向に沿って、往復して移動させながら、回転体１
にコーティング液を塗布させる。往復速度は回転数と同
様に、少なくとも１秒以上の連続移動時の速度むらが±
１０％以内の範囲として約５０〜３００ｍｍ／ｓｅｃに
設定した。往復速度が遅すぎると塗布後の液がながれ、
速すぎるとぬれ面が形成されづらいので前記速度に調速
した。また、この時の霧化吐出圧を約３〜６ｋｇｆ／ｃ
ｍ2 に設定した。吐出圧が低すぎると霧があらくなり、
高すぎるとコーティング液が多く飛散しすぎ無駄となる
ため、前記吐出圧内に調整した。吹付距離は、被塗面と
ノズル先端との距離を約１５０〜２５０ｍｍに設定し
た。近すぎるとコーティング液が被塗面にたまり塗装む
らとなりやすく、遠すぎると被塗面にコーティング液が
付着する前に霧が乾き、塗面のざらつきの原因となり、
上記液の無駄にもなるので、前記距離に調整した。FIG. 1 is an example of the coating method according to the present invention. A rotating body 1 having an outer diameter of a predetermined width, such as an aluminum rotor of a mechanical supercharger, is attached to a coating jig 3. It is rotated by a driving means such as a rotation motor 2 and one of the rotating bodies 1 is heated by a heater 5 while the nozzle diameter is 1 m.
While spraying a predetermined coating liquid back and forth along the axial direction of the rotator with the spray gun 4 of m,
Apply coating liquid to. The reciprocating speed is the same as the rotation speed, and the speed unevenness during continuous movement of at least 1 second or more is ±
The range within 10% was set to about 50 to 300 mm / sec. If the reciprocating speed is too slow, the liquid after application will flow,
If the speed is too fast, it is difficult to form a wet surface, so the speed was adjusted to the above speed. Also, the atomizing discharge pressure at this time is about 3 to 6 kgf / c.
It was set to m 2 . If the discharge pressure is too low, the fog will become rough,
If it is too high, a large amount of the coating liquid will be scattered and wasted, so the pressure was adjusted to within the above discharge pressure. The spray distance was set so that the distance between the surface to be coated and the tip of the nozzle was about 150 to 250 mm. If it is too close, the coating liquid will easily accumulate on the surface to be coated, causing uneven coating, and if it is too far, the mist will dry before the coating liquid adheres to the surface, causing the surface to become rough.
The liquid is wasted, so the distance is adjusted to the above range.
【００４７】膜厚さの測定には、表面粗さ計を用い、ロ
ータ上基準面３か所にマスキングを施し、基準面と被覆
面との段差を表面粗さ計で測定し、その値を膜厚さとし
た。To measure the film thickness, a surface roughness meter is used, masking is applied to three reference surfaces on the rotor, and the step between the reference surface and the coated surface is measured with the surface roughness meter. The film thickness.
【００４８】［実施例１, ２, ４, ５］コーティング液
の粘度をフォードカップ＃４を用いて２５秒〜７０秒の
間に調製し、ロータを水平状態に置き回転軸を中心に回
転させ、かつ溶剤蒸発用装置にて加熱しながら、ロータ
の表面にスプレーコーティングを行い、１００℃で３０
分間乾燥した後、２３０℃で３時間焼成し、膜厚さを測
定した。結果を表１に示す。[Examples 1, 2, 4, 5] The viscosity of the coating solution was adjusted by using Ford cup # 4 for 25 seconds to 70 seconds, and the rotor was placed horizontally and rotated about the rotation axis. Also, spray coating on the surface of the rotor while heating it with a solvent evaporation device,
After drying for 1 minute, it was baked at 230 ° C. for 3 hours, and the film thickness was measured. The results are shown in Table 1.
【００４９】なお、コーティング液の硬質結着性樹脂は
ポリイミド樹脂を、固体潤滑材はフッ素樹脂粉末を使用
した。The hard binder resin of the coating liquid was polyimide resin, and the solid lubricant was fluororesin powder.
【００５０】［実施例３, ６］コーティング液の粘度を
フォードカップ＃４を用いて２５秒〜７０秒の間に調製
し、ロータを５０℃〜１５０℃に３０分以上加熱し、し
かる後にロータ軸を回転軸として１分間あたり５〜６０
回転で正逆両方向に回転させながら、加熱したロータの
熱を利用して溶剤分を乾燥させた後、２３０℃で３時間
焼成し、膜厚さを測定した結果を表１に示す。[Examples 3 and 6] The viscosity of the coating solution was adjusted by using Ford cup # 4 for 25 seconds to 70 seconds, and the rotor was heated to 50 ° C to 150 ° C for 30 minutes or more. 5 to 60 per minute with the axis as the axis of rotation
While rotating in both forward and reverse directions by rotation, the solvent content was dried using the heat of the heated rotor, followed by baking at 230 ° C. for 3 hours, and the film thickness measurement results are shown in Table 1.
【００５１】なお、コーティング液の硬質結着性樹脂は
ポリイミド樹脂を、固体潤滑材はフッ素樹脂粉末を使用
した。The hard binder resin of the coating liquid was polyimide resin, and the solid lubricant was fluororesin powder.
【００５２】[0052]
【表１】 [Table 1]
【００５３】［実施例７〜９］コーティング液に含まれ
る硬質結着性樹脂をエポキシ樹脂、フェノール樹脂、ポ
リアミドイミド樹脂と各々変更して、実施例２及び４と
同じ方法でロータに被覆焼成を行ったところ、良好な被
覆を持ったスクリュー式過給機のロータを得た。結果を
表２に示す。[Examples 7 to 9] The hard binder resin contained in the coating liquid was changed to epoxy resin, phenol resin and polyamide-imide resin, respectively, and the rotor was coated and baked in the same manner as in Examples 2 and 4. As a result, a rotor for a screw type supercharger having a good coating was obtained. Table 2 shows the results.
【００５４】［実施例１０、１１］コーティング液に含
まれる固体潤滑材を炭素系粉末、二硫化モリブデン粉末
と各々変更して、実施例２及び４と同じ方法でロータに
被覆焼成を行ったところ、良好な被覆を持ったスクリュ
ー式過給機のロータを得た。結果を表２に示す。[Examples 10 and 11] The solid lubricant contained in the coating liquid was changed to carbon powder and molybdenum disulfide powder, and the rotor was coated and fired in the same manner as in Examples 2 and 4. , A screw type turbocharger rotor with good coating was obtained. Table 2 shows the results.
【００５５】[0055]
【表２】 [Table 2]
【００５６】［比較例１, ２］実施例と同様にして粘度
を９０秒、１５秒の２水準に調整し膜厚さを測定した。
その結果を表３に示す。[Comparative Examples 1 and 2] In the same manner as in Examples, the viscosity was adjusted to two levels of 90 seconds and 15 seconds and the film thickness was measured.
Table 3 shows the results.
【００５７】[0057]
【表３】 [Table 3]
【００５８】[0058]
【発明の効果】以上のように、この発明によれば、従来
公知のものに比べ、異物埋没性に優れる８０μｍ以上の
被覆を一回の被覆焼成工程で行うことができる。As described above, according to the present invention, it is possible to perform coating of 80 μm or more, which is more excellent in foreign matter burying property, in a single coating and baking step as compared with the conventionally known ones.
【図１】本発明に係るコーティング方法の一例を示す斜
視図FIG. 1 is a perspective view showing an example of a coating method according to the present invention.
１ 回転体 ２ 回軸用モータ ３ 被覆用治具 ４ スプレーガン ５ ヒータ 1 Rotating body 2 Spindle motor 3 Coating jig 4 Spray gun 5 Heater
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｆ０２Ｂ 39/00 Ｆ０２Ｂ 39/00 Ｕ 39/16 39/16 Ｚ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Office reference number FI technical display location F02B 39/00 F02B 39/00 U 39/16 39/16 Z
Claims (5)
膜を形成するコーティング方法において、所定の温度に
加熱した回転体を所定の回転数で回転させつつ、固形潤
滑材と結着性樹脂との混合樹脂に溶剤を加えてなる所定
温度のコーティング液を、上記回転体の外表面にスプレ
ーコート法により被覆して被膜を形成すると同時に乾燥
させて溶剤を除去し、その後該被膜を所定の温度で焼成
することを特徴とする回転機械用回転体のコーティング
方法。1. A coating method for forming a synthetic resin film on the outer surface of a rotating body of a rotating machine, wherein a solid lubricant and a binding resin are applied while rotating the rotating body heated to a predetermined temperature at a predetermined rotation speed. A coating liquid of a predetermined temperature obtained by adding a solvent to a mixed resin of and is coated on the outer surface of the above-mentioned rotating body by a spray coating method to form a coating film and simultaneously dried to remove the solvent, and then the coating film is coated with a predetermined coating material. A method for coating a rotating body for a rotating machine, which comprises firing at a temperature.
し、これに９５〜４０重量％の溶剤を加えて上記のコー
ティング液としたことを特徴とする請求項１に記載の回
転機械用回転体のコーティング方法。2. The rotating machine according to claim 1, wherein the amount of the mixed resin is 5 to 60% by weight, and 95 to 40% by weight of a solvent is added to the mixed resin to prepare the coating solution. Method of coating rotating body.
とし、上記結着性樹脂の量を９５〜５重量％としたこと
を特徴とする請求項２に記載の回転機械用回転体のコー
ティング方法。3. The amount of the solid lubricant is 5 to 95% by weight.
The coating method for a rotating body for a rotating machine according to claim 2, wherein the amount of the binder resin is 95 to 5% by weight.
としたことを特徴とする請求項１乃至３のいずれかに記
載の回転機械用回転体のコーティング方法。4. The temperature of the coating liquid is 5 to 80 ° C.
The method for coating a rotating body for a rotary machine according to any one of claims 1 to 3, wherein:
℃としたことを特徴とする請求項１乃至４のいずれかに
記載の回転機械用回転体のコーティング方法。5. The firing temperature of the coating film is 180 to 280.
5. The method for coating a rotary body for a rotary machine according to claim 1, wherein the coating temperature is set to be ° C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34326095A JPH08257479A (en) | 1994-12-28 | 1995-12-28 | Coating method of rotor for rotary machine |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32821994 | 1994-12-28 | ||
| JP6-328219 | 1994-12-28 | ||
| JP34326095A JPH08257479A (en) | 1994-12-28 | 1995-12-28 | Coating method of rotor for rotary machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08257479A true JPH08257479A (en) | 1996-10-08 |
Family
ID=26572790
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34326095A Pending JPH08257479A (en) | 1994-12-28 | 1995-12-28 | Coating method of rotor for rotary machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08257479A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012096028A1 (en) * | 2011-01-14 | 2012-07-19 | シャープ株式会社 | Method for manufacturing thin film, and apparatus for manufacturing thin film |
| WO2013137266A1 (en) * | 2012-03-13 | 2013-09-19 | 日産自動車株式会社 | Pump manufacturing method |
| KR20190076135A (en) * | 2017-12-22 | 2019-07-02 | 정태민 | Powder coating apparatus of coil and powder coating method of coil using the same |
-
1995
- 1995-12-28 JP JP34326095A patent/JPH08257479A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012096028A1 (en) * | 2011-01-14 | 2012-07-19 | シャープ株式会社 | Method for manufacturing thin film, and apparatus for manufacturing thin film |
| JP2012144800A (en) * | 2011-01-14 | 2012-08-02 | Sharp Corp | Method for manufacturing thin film, and apparatus for manufacturing thin film |
| WO2013137266A1 (en) * | 2012-03-13 | 2013-09-19 | 日産自動車株式会社 | Pump manufacturing method |
| KR20190076135A (en) * | 2017-12-22 | 2019-07-02 | 정태민 | Powder coating apparatus of coil and powder coating method of coil using the same |
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