JP4751794B2 - Anodizing method - Google Patents

Anodizing method Download PDF

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JP4751794B2
JP4751794B2 JP2006232084A JP2006232084A JP4751794B2 JP 4751794 B2 JP4751794 B2 JP 4751794B2 JP 2006232084 A JP2006232084 A JP 2006232084A JP 2006232084 A JP2006232084 A JP 2006232084A JP 4751794 B2 JP4751794 B2 JP 4751794B2
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peripheral surface
inner peripheral
cylindrical portion
insulating member
cylindrical
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JP2008056953A (en
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功 出沢
俊英 吉川
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Nissin Kogyo Co Ltd
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Description

本発明はアルマイト処理方法に関し、更に詳細には筒状部を具備するアルミニウム製品を電解液に浸漬して陽極酸化し、前記アルミニウム製品の表面にアルマイト皮膜を形成するアルマイト処理方法に関する。   The present invention relates to an alumite treatment method, and more particularly to an alumite treatment method in which an aluminum product having a cylindrical portion is immersed in an electrolytic solution and anodized to form an alumite film on the surface of the aluminum product.

自動二輪車や自動三輪車等に用いられ、操作レバーによって液圧を発生させる、図４に示すマスタシリンダ部材１０は、通常、アルミニウム製品であって、ピストン及びカップシールが挿入される筒状部としてのシリンダ部１２が設けられている。
かかるマスタシリンダ部材１０は、通常、電解液に浸漬して陽極酸化（以下、アルマイト処理と称することがある）を施し、マスタシリンダ部材１０の外面にアルマイト皮膜を形成して耐気候性の向上が図られている。
また、シリンダ部１２の内周面は、挿入されたピストン及びカップシールが摺動する摺動面であるため、シリンダ部１２の摺動面にもアルマイト処理を施して硬質のアルマイト皮膜を形成する。
ところで、通常、外面をアルマイト処理してアルマイト皮膜を形成したアルミニウム製品の耐気候性は、陽極酸化の時間を長くしてアルマイト皮膜を厚くすることによって向上できるが、アルマイト皮膜の表面粗さは陽極酸化の時間を長くするほど（アルマイト皮膜を厚く形成するほど）粗くなる。 The master cylinder member 10 shown in FIG. 4 that is used in motorcycles, motor tricycles, and the like and generates hydraulic pressure by an operation lever is usually an aluminum product, and serves as a cylindrical portion into which a piston and a cup seal are inserted. A cylinder portion 12 is provided.
Such a master cylinder member 10 is usually immersed in an electrolytic solution and anodized (hereinafter sometimes referred to as alumite treatment), and an alumite film is formed on the outer surface of the master cylinder member 10 to improve the weather resistance. It is illustrated.
Further, since the inner peripheral surface of the cylinder portion 12 is a sliding surface on which the inserted piston and cup seal slide, the hard sliding surface of the cylinder portion 12 is also anodized to form a hard anodized film. .
By the way, the weather resistance of an aluminum product in which an outer surface is usually anodized to form an anodized film can be improved by increasing the anodizing time and increasing the thickness of the anodized film. The longer the oxidation time (the thicker the alumite film is formed), the rougher it becomes.

一方、シリンダ部１２のピストン及びカップシールが摺動する摺動面には、平滑なアルマイト皮膜を形成することが必要である。
このため、マスタシリンダ部材１０外面とシリンダ部１２の内周面とに施すアルマイト処理では、その陽極酸化の時間を変更して施すことを要する。
この様に、マスタシリンダ部材１０の外面とシリンダ部１２の内周面とに施す陽極酸化の時間を変更するには、マスタシリンダ部材１０の外面に陽極酸化を施す際に、シリンダ部１２の開口部にキャップ等のマスキング部材を被着して、シリンダ部１２内に電解液が進入しないようにしている（例えば下記特許文献１参照）。
特開２０００−１０４６８０号公報 On the other hand, it is necessary to form a smooth alumite film on the sliding surface on which the piston and cup seal of the cylinder portion 12 slide.
For this reason, in the alumite process performed to the outer surface of the master cylinder member 10 and the inner peripheral surface of the cylinder part 12, it is necessary to change the anodizing time.
Thus, in order to change the anodizing time applied to the outer surface of the master cylinder member 10 and the inner peripheral surface of the cylinder portion 12, when the anodizing is performed on the outer surface of the master cylinder member 10, the opening of the cylinder portion 12 is opened. A masking member such as a cap is attached to the portion so that the electrolyte does not enter the cylinder portion 12 (see, for example, Patent Document 1 below).
JP 2000-104680 A

マスタシリンダ部材１０のシリンダ部１２の開口部にキャップ等のマスキング部材を被着し、シリンダ部１２内に電解液が進入しないようにして、マスタシリンダ部材１０の外面に陽極酸化を施すことによって、シリンダ部１２の内周面に粗いアルマイト皮膜が形成されることを防止できる。
しかし、シリンダ部１２の内周面は、ピストン及びカップシールが摺動する摺動面でもあり、アルマイト処理を施して平滑な（薄い）アルマイト皮膜を形成する必要がある。このため、マスキング部材を除去したマスタシリンダ部材１０を、再度、電解液に浸漬して陽極酸化を施す。
この様に、マスタシリンダ部材１０に対して二回の陽極酸化を施すことは、マスタシリンダ部材１０のアルマイト処理工程を複雑化する。 A masking member such as a cap is attached to the opening of the cylinder portion 12 of the master cylinder member 10, and the outer surface of the master cylinder member 10 is anodized so that the electrolyte does not enter the cylinder portion 12. A rough anodized film can be prevented from being formed on the inner peripheral surface of the cylinder portion 12.
However, the inner peripheral surface of the cylinder portion 12 is also a sliding surface on which the piston and the cup seal slide, and it is necessary to perform alumite treatment to form a smooth (thin) alumite film. For this reason, the master cylinder member 10 from which the masking member has been removed is again immersed in the electrolytic solution and anodized.
Thus, performing anodization twice on the master cylinder member 10 complicates the anodizing process of the master cylinder member 10.

また、マスタシリンダ部材１０のシリンダ部１２では、その内壁面にサプライポート用の貫通孔１４やリリーフポート用の貫通孔１６が開口されている。しかも、貫通孔１４，１６、ブレーキレバーの押動部の挿入口１２ａ及び出力ポート１２ｂの各開口部の開口径及び開口形状が異なっている。このため、各開口部を閉塞するマスキング部材としても、その形状及び外径が異なるものを用いることが必要である。
したがって、かかる各種のマスキング部材を対応する開口部に被着作業及び除去作業は極めて煩雑な作業であり、各種のマスキング部材の管理も困難である。
そこで、本発明の課題は、筒状部を具備するアルミニウム製品に対して施した一回のアルマイト処理によって、筒状部の内周面とアルミニウム製品の外面とに異なる厚さのアルマイト皮膜を形成し得るアルマイト処理方法を提供することにある。 Further, in the cylinder portion 12 of the master cylinder member 10, a supply port through hole 14 and a relief port through hole 16 are opened on the inner wall surface thereof. In addition, the opening diameters and shapes of the openings of the through holes 14 and 16, the insertion port 12a of the brake lever pressing portion, and the output port 12b are different. For this reason, it is necessary to use a member having a different shape and outer diameter as a masking member for closing each opening.
Accordingly, the operation of attaching and removing the various masking members to the corresponding openings is extremely complicated, and the management of the various masking members is difficult.
Therefore, an object of the present invention is to form alumite films having different thicknesses on the inner peripheral surface of the cylindrical portion and the outer surface of the aluminum product by a single anodizing treatment performed on the aluminum product having the cylindrical portion. It is to provide an alumite treatment method that can be used.

本発明者等は、前記課題を解決すべく検討した結果、筒状部内に筒状の絶縁部材を挿入し、筒状部内への電解液に流入を制限しつつ、陽極酸化を施すことによって、筒状部の内周面に形成されるアルマイト皮膜は、アルミニウム製品の外面に形成されるアルマイト皮膜に比較して薄いことを知り、本発明に到達した。
すなわち、本発明は、筒状部を具備するアルミニウム製品を電解液に浸漬して陽極酸化し、前記アルミニウム製品の表面にアルマイト皮膜を形成するアルマイト処理を施す際に、前記筒状部の内周面と接触する電解液量を前記アルミニウム製品の外面に比較して制限できるように、前記筒状部内に筒状の絶縁部材を挿入して、前記筒状部の内周面と絶縁部材の外周面との間に形成した所定間隙を、前記内周面に沿って形成し、次いで、前記アルミニウム製品の筒状部の内周面を含む表面に陽極酸化を施すことを特徴とするアルマイト処理方法にある。 As a result of studying to solve the above-mentioned problems, the present inventors inserted a cylindrical insulating member into the cylindrical portion, and restricted the inflow to the electrolytic solution into the cylindrical portion, while performing anodization, Knowing that the anodized film formed on the inner peripheral surface of the cylindrical part is thinner than the anodized film formed on the outer surface of the aluminum product, the present invention has been achieved.
That is, the present invention provides an inner periphery of the cylindrical portion when anodizing is performed by immersing an aluminum product having a cylindrical portion in an electrolytic solution and anodizing to form an alumite film on the surface of the aluminum product. A cylindrical insulating member is inserted into the cylindrical portion so that the amount of the electrolytic solution in contact with the surface can be limited compared to the outer surface of the aluminum product, and the inner peripheral surface of the cylindrical portion and the outer periphery of the insulating member An alumite treatment method characterized by forming a predetermined gap formed between the inner peripheral surface and the inner peripheral surface, and then anodizing the surface including the inner peripheral surface of the cylindrical portion of the aluminum product. It is in.

かかる本発明において、筒状部を、前記筒状部の内径よりも小径の貫通孔が内壁面に開口されている筒状部としても、小径の貫通孔をマスキング部材によって閉塞することは要しない。この筒状部を、挿入されたピストンが摺動する摺動面を内周面とするシリンダ部としてもよい。
また、筒状部の内周面と絶縁部材の周面との間の所定間隙を、１ｍｍ以下とすることによって、筒状部の内周面に形成されるアルマイト皮膜とアルミニウム製品の外面に形成されるアルマイト皮膜との膜厚差を拡大できる。
更に、アルミニウム製品として、ピストンとカップシールとが摺動する摺動面を内周面とするシリンダ部を具備するマスタシリンダ部材を用い、前記シリンダ部に筒状の絶縁部材を挿入し、前記筒状部の摺動面と絶縁部材の表面との間に形成した所定間隙を、前記摺動面に沿って形成することによって、シリンダ部の摺動面を硬いアルマイト皮膜によって被覆できる。 In the present invention, even if the cylindrical portion is a cylindrical portion in which a through hole having a diameter smaller than the inner diameter of the cylindrical portion is opened on the inner wall surface, it is not necessary to close the small diameter through hole with a masking member. . The cylindrical portion may be a cylinder portion having a sliding surface on which the inserted piston slides as an inner peripheral surface.
In addition, an alumite film formed on the inner peripheral surface of the cylindrical portion and the outer surface of the aluminum product are formed by setting a predetermined gap between the inner peripheral surface of the cylindrical portion and the peripheral surface of the insulating member to 1 mm or less. The film thickness difference with the alumite film to be applied can be expanded.
Further, as the aluminum product, a master cylinder member having a cylinder portion having an inner peripheral surface as a sliding surface on which the piston and the cup seal slide is inserted, and a cylindrical insulating member is inserted into the cylinder portion, and the cylinder The sliding surface of the cylinder portion can be covered with a hard anodized film by forming a predetermined gap formed between the sliding surface of the shaped portion and the surface of the insulating member along the sliding surface.

本発明では、アルミニウム製品の筒状部内に筒状の絶縁部材を挿入し、筒状部の内周面と絶縁部材の周面との間に所定間隙を形成した状態で、アルミニウム製品を電解液に浸漬して陽極酸化を施す。
このため、筒状部の内周面と接触する電解液量をアルミニウム製品の外面に比較して制限でき、筒状部の内周面には、アルミニウム製品の外面に比較して薄いアルマイト皮膜を形成できる。
一般に、アルミニウム製品に対して同一条件下で陽極酸化するアルマイト処理では、アルミニウム製品の表面に形成されるアルマイト皮膜が薄いほど、平滑なアルマイト皮膜を形成できる。
このため、本発明に係るアルマイト処理方法では、筒状部の内周面には、アルミニウム製品の外面に形成されるアルマイト皮膜に比較して、平滑な（薄い）アルミニウム皮膜を一回のアルマイト処理によって形成できる結果、従来の筒状部を具備するアルミニウム製品に対するアルマイト処理に比較して、アルマイト処理工程を短縮できると共に、各種のマスキング部材の管理も不要にできる。 In the present invention, a tubular insulating member is inserted into a tubular portion of an aluminum product, and the aluminum product is subjected to an electrolytic solution in a state where a predetermined gap is formed between the inner peripheral surface of the tubular portion and the peripheral surface of the insulating member. Anodize by dipping in
For this reason, the amount of electrolyte solution in contact with the inner peripheral surface of the cylindrical part can be limited compared to the outer surface of the aluminum product, and the inner peripheral surface of the cylindrical part has a thin anodized film compared to the outer surface of the aluminum product. Can be formed.
In general, in an anodizing treatment in which an aluminum product is anodized under the same conditions, a smoother anodized film can be formed as the anodized film formed on the surface of the aluminum product is thinner.
For this reason, in the alumite treatment method according to the present invention, a smooth (thin) aluminum film is applied to the inner peripheral surface of the cylindrical portion once compared with the alumite film formed on the outer surface of the aluminum product. As a result, the alumite treatment process can be shortened and management of various masking members can be made unnecessary as compared with the alumite treatment for an aluminum product having a conventional cylindrical portion.

本発明に係るアルマイト処理方法を適用するアルミニウム製品としては、筒状部を具備するアルミニウム製品である。かかるアルミニウム製品の一例を図１に示す。図１に示すアルミニウム製品は、自動二輪車や自動三輪車等に用いられるブレーキシステムを構成するマスタシリンダ部材１０である。このマスタシリンダ部材１０には、ピストン及びカップシールが挿入される筒状部としてのシリンダ部１２が設けられている。
このシリンダ部１２には、その内壁面にサプライポート用の貫通孔１４やリリーフポート用の貫通孔１６が開口されている。しかも、貫通孔１４，１６、ブレーキレバーの押動部の挿入口１２ａ及び出力ポート１２ｂの各開口部の開口径及び開口形状が異なっている。 The aluminum product to which the alumite treatment method according to the present invention is applied is an aluminum product having a cylindrical portion. An example of such an aluminum product is shown in FIG. An aluminum product shown in FIG. 1 is a master cylinder member 10 constituting a brake system used for a motorcycle, a tricycle, or the like. The master cylinder member 10 is provided with a cylinder portion 12 as a cylindrical portion into which a piston and a cup seal are inserted.
A supply port through hole 14 and a relief port through hole 16 are opened on the inner wall surface of the cylinder portion 12. In addition, the opening diameters and shapes of the openings of the through holes 14 and 16, the insertion port 12a of the brake lever pressing portion, and the output port 12b are different.

図１に示すマスタシリンダ部材１０には、その耐気候性を向上すべく、マスタシリンダ部材１０の外面に厚いアルマイト皮膜を形成すると共に、挿入されるピストン及びカップシールが摺動する摺動面でもあるシリンダ部１２の内周面には、平滑なアルマイト皮膜を形成する。
一般に、アルマイト処理では、同一陽極酸化条件下では、マスタシリンダ部材１０の表面に形成されるアルマイト皮膜が厚くなるほど、アルマイト皮膜の表面が粗くなる。
したがって、図１に示すマスタシリンダ部材１０では、挿入されるピストン及びカップシールが摺動する摺動面でもあるシリンダ部１２の内周面には、マスタシリンダ部材１０の外面に形成するアルマイト皮膜よりも薄いアルマイト皮膜を形成する必要がある。
このため、先ず、図１に示すマスタシリンダ部材１０では、シリンダ部１２に筒状の絶縁部材２０を挿入し、シリンダ部１２の摺動面と絶縁部材２０の周面との間に所定間隙を、シリンダ部１２の摺動面に沿って形成する。 The master cylinder member 10 shown in FIG. 1 is formed with a thick anodized film on the outer surface of the master cylinder member 10 in order to improve its weather resistance, and also on a sliding surface on which the inserted piston and cup seal slide. A smooth alumite film is formed on the inner peripheral surface of a certain cylinder portion 12.
In general, in anodizing, under the same anodic oxidation conditions, the thicker the anodized film formed on the surface of the master cylinder member 10, the rougher the surface of the anodized film.
Therefore, in the master cylinder member 10 shown in FIG. 1, an alumite film formed on the outer surface of the master cylinder member 10 is formed on the inner peripheral surface of the cylinder portion 12 which is also a sliding surface on which the inserted piston and cup seal slide. It is necessary to form a thin anodized film.
For this reason, first, in the master cylinder member 10 shown in FIG. 1, the cylindrical insulating member 20 is inserted into the cylinder portion 12, and a predetermined gap is provided between the sliding surface of the cylinder portion 12 and the peripheral surface of the insulating member 20. And formed along the sliding surface of the cylinder portion 12.

この絶縁部材２０は、電気絶縁性であって、電解液に対して耐久性を有する材料から成る筒状の部材であればよく、例えばプラスチック製又はセラミック製の筒状の部材を挙げることができる。
図１に示す絶縁部材２０は、円柱状であって、出力ポート１２ｂ側の端部に、鍔状部２０ａが形成されている。この鍔状部２０ａの外周面は、シリンダ部１２の内周面のうち、ピストン及びカップシールが摺動する摺動面（以下、単に摺動面と称することがある）から外れる位置の内周面に摺接している。このため、シリンダ部１２のピストン及びカップシールが摺動する摺動面と絶縁部材２０の外周面との間隙を一定に保持できる。 The insulating member 20 may be a cylindrical member made of a material that is electrically insulative and has durability against an electrolytic solution. Examples thereof include a cylindrical member made of plastic or ceramic. .
The insulating member 20 shown in FIG. 1 has a columnar shape, and a hook-shaped portion 20a is formed at the end on the output port 12b side. The outer peripheral surface of the bowl-shaped portion 20a is the inner periphery of the inner peripheral surface of the cylinder portion 12 at a position that is disengaged from a sliding surface on which the piston and the cup seal slide (hereinafter sometimes simply referred to as a sliding surface). It is in sliding contact with the surface. For this reason, the gap between the sliding surface on which the piston and the cup seal of the cylinder portion 12 slide and the outer peripheral surface of the insulating member 20 can be kept constant.

次いで、図１に示すマスタシリンダ部材１０を、そのシリンダ部１２に絶縁部材２０を挿入した状態で電解液に浸漬して、陽極酸化を施す。
かかる電解液としては、通常の硬質アルマイト処理の際に採用される電解液を好適に用いることができ、具体的には硫酸濃度が１０〜２０％の電解液を用いることができる。
この様な電解液に浸漬したマスタシリンダ部材１０に施す陽極酸化は、電解液を２０〜３０℃に保持しつつ、直流電源の陽極に接続されたマスタシリンダ部材１０に対し、１０〜２０Ｖの直流電圧を１０〜３０分間印加して行う。
かかる陽極酸化の際に、シリンダ部１２の摺動面と絶縁部材２０の外周面との間隙には、ブレーキレバーの押動部の挿入口１２ａ、サプライポート用の貫通孔１４及びリリーフポート用の貫通孔１６から電解液が流入される。
しかし、シリンダ部１２の摺動面と接触する電解液量は、マスタシリンダ部材１０の外面に比較して制限される。このため、マスタシリンダ部材１０に所定時間の陽極酸化を施すことによって、マスタシリンダ部材１０の外面に形成されるアルマイト皮膜に比較して、シリンダ部１２の摺動面に形成されるアルマイト皮膜の厚さを薄くできる。 Next, the master cylinder member 10 shown in FIG. 1 is immersed in an electrolytic solution in a state where the insulating member 20 is inserted into the cylinder portion 12 and anodized.
As such an electrolytic solution, an electrolytic solution employed in a normal hard alumite treatment can be suitably used. Specifically, an electrolytic solution having a sulfuric acid concentration of 10 to 20% can be used.
The anodic oxidation applied to the master cylinder member 10 immersed in such an electrolytic solution is a direct current of 10 to 20 V with respect to the master cylinder member 10 connected to the anode of the direct current power source while maintaining the electrolytic solution at 20 to 30 ° C. A voltage is applied for 10 to 30 minutes.
During the anodic oxidation, the gap between the sliding surface of the cylinder portion 12 and the outer peripheral surface of the insulating member 20 is inserted into the insertion port 12a of the pushing portion of the brake lever, the through hole 14 for the supply port, and the relief port. The electrolytic solution flows from the through hole 16.
However, the amount of the electrolyte solution that comes into contact with the sliding surface of the cylinder portion 12 is limited compared to the outer surface of the master cylinder member 10. For this reason, the thickness of the anodized film formed on the sliding surface of the cylinder portion 12 is compared with the anodized film formed on the outer surface of the master cylinder member 10 by anodizing the master cylinder member 10 for a predetermined time. Can be thin.

シリンダ部１２の摺動面と絶縁部材２０の外周面との間隙と、シリンダ部１２の摺動面に形成されるアルマイト皮膜の膜厚等との関係を図２に示す。
図２には、シリンダ部１２の摺動面と絶縁部材２０の外周面との間隙を変更して、マスタシリンダ部材１０に所定時間の陽極酸化（アルマイト処理）を施した後、シリンダ部１２の摺動面に形成されたアルマイト皮膜の膜厚、及びシリンダ部１２の摺動面に形成されたアルマイト皮膜について、所定方向の最大粗さ（Ｒｙ）の測定結果を示す。また、アルマイト処理前のシリンダ部１２の摺動面についての最大粗さ（Ｒｙ）の測定結果も図２に併せて示した。
図２において、シリンダ部１２に絶縁部材２０を挿入することなくマスタシリンダ部材１０に陽極酸化を施した場合は、マスタシリンダ部材１０の外面に形成されるアルマイト皮膜と略等しい膜厚のアルマイト皮膜がシリンダ部１２の摺動面に形成される。
尚、最大粗さ（Ｒｙ）は、ＪＩＳＢ ０６０１に準拠して測定した。 FIG. 2 shows the relationship between the gap between the sliding surface of the cylinder portion 12 and the outer peripheral surface of the insulating member 20 and the film thickness of the alumite film formed on the sliding surface of the cylinder portion 12.
In FIG. 2, the gap between the sliding surface of the cylinder portion 12 and the outer peripheral surface of the insulating member 20 is changed, and the master cylinder member 10 is subjected to anodization (alumite treatment) for a predetermined time. The measurement result of the maximum roughness (Ry) in a predetermined direction is shown about the film thickness of the alumite film | membrane formed in the sliding surface, and the alumite film | membrane formed in the sliding surface of the cylinder part 12. FIG. Moreover, the measurement result of the maximum roughness (Ry) about the sliding surface of the cylinder part 12 before anodizing is also shown in FIG.
In FIG. 2, when anodizing is performed on the master cylinder member 10 without inserting the insulating member 20 into the cylinder portion 12, an alumite film having a film thickness substantially equal to the alumite film formed on the outer surface of the master cylinder member 10 is formed. It is formed on the sliding surface of the cylinder part 12.
The maximum roughness (Ry) was measured according to JISB 0601.

図２から明らかな様に、シリンダ部１２の摺動面と絶縁部材２０の外周面との間隙が広くなるに従って、シリンダ部１２の摺動面に形成されるアルマイト皮膜の膜厚が増大し、形成されるアルマイト皮膜の最大粗さ（Ｒｙ）も大きくなる。
このため、図１に示すように、シリンダ部１２の摺動面と絶縁部材２０の外周面との間隙が所定間隙となるように、シリンダ部１２に円柱状の絶縁部材２０を挿入したマスタシリンダ部材１０を、電解液に浸漬して陽極酸化することによって、一回のアルマイト処理でシリンダ部１２の摺動面に形成されたアルマイト皮膜を、マスタシリンダ部材１０の外面に形成されたアルマイト皮膜よりも薄膜にできる。
その結果、従来、二回のアルマイト処理が必要であったマスタシリンダ部材１０のアルマイト処理工程を一回のアルマイト処理で足り、マスタシリンダ部材１０のアルマイト処理工程を簡略化できる。
ここで、シリンダ部１２の摺動面と絶縁部材２０の外周面との間隙を、１ｍｍ以下、特に０．５ｍｍ以下とすることによって、シリンダ部１２の摺動面に形成されるアルマイト皮膜と、マスタシリンダ部材１０の外面に形成されるアルマイト皮膜（絶縁部材２０を挿入しなかったシリンダ部１２の内周面に形成されるアルマイト皮膜）との膜厚差を拡大でき、アルマイト皮膜の最大粗さ（Ｒｙ）も小さくできる。 As is clear from FIG. 2, as the gap between the sliding surface of the cylinder portion 12 and the outer peripheral surface of the insulating member 20 increases, the thickness of the alumite film formed on the sliding surface of the cylinder portion 12 increases. The maximum roughness (Ry) of the formed alumite film is also increased.
Therefore, as shown in FIG. 1, a master cylinder in which a cylindrical insulating member 20 is inserted into the cylinder portion 12 so that the gap between the sliding surface of the cylinder portion 12 and the outer peripheral surface of the insulating member 20 is a predetermined gap. By anodizing the member 10 by immersing the member 10 in the electrolytic solution, the alumite film formed on the sliding surface of the cylinder portion 12 by one alumite treatment is changed from the alumite film formed on the outer surface of the master cylinder member 10. Can also be made into a thin film.
As a result, the alumite treatment process for the master cylinder member 10 that conventionally required two alumite treatments is sufficient for one alumite treatment, and the alumite treatment process for the master cylinder member 10 can be simplified.
Here, an alumite film formed on the sliding surface of the cylinder portion 12 by setting the gap between the sliding surface of the cylinder portion 12 and the outer peripheral surface of the insulating member 20 to 1 mm or less, particularly 0.5 mm or less, The film thickness difference from the anodized film formed on the outer surface of the master cylinder member 10 (an anodized film formed on the inner peripheral surface of the cylinder portion 12 where the insulating member 20 is not inserted) can be enlarged, and the maximum roughness of the anodized film (Ry) can also be reduced.

図１に示すマスタシリンダ部材１０では、出力ポート１２ｂ側の端部に鍔状部２０ａが形成されている円柱状の絶縁部材２０を用いているが、図３に示す様に、鍔状部２０ａの出力ポート１２ｂ側端面から突出部２０ｂが形成されている絶縁部材２０を用いることができる。
図３に示す絶縁部材２０をシリンダ部１２内に挿入したとき、突出部２０ｂが出力ポート１２ｂ内に入り込み、シリンダ部１２内での絶縁部材２０の位置決めを確実且つ容易に行うことができる。
以上の図１〜図３には、内壁面に貫通孔が開口されている筒状部（シリンダ部１２）について説明しているが、内壁面に貫通孔が開口されていない筒状部であっても本発明を適用できる。 The master cylinder member 10 shown in FIG. 1 uses a cylindrical insulating member 20 having a flange-shaped portion 20a formed at the end on the output port 12b side, but as shown in FIG. 3, the flange-shaped portion 20a. The insulating member 20 in which the protruding portion 20b is formed from the output port 12b side end surface can be used.
When the insulating member 20 shown in FIG. 3 is inserted into the cylinder portion 12, the protruding portion 20b enters the output port 12b, and the insulating member 20 can be positioned in the cylinder portion 12 reliably and easily.
FIGS. 1 to 3 describe the cylindrical part (cylinder part 12) in which a through hole is opened in the inner wall surface. However, the cylindrical part in which the through hole is not opened in the inner wall surface is described. However, the present invention can be applied.

本発明に係るアルマイト処理を施すマスタシリンダ部材の状態の一例を説明する断面図である。It is sectional drawing explaining an example of the state of the master cylinder member which performs the alumite process which concerns on this invention. シリンダ部１２の摺動面と絶縁部材２０の外周面との間隙と、シリンダ部１２の摺動面に形成されるアルマイト皮膜の膜厚等との関係を示すグラフである。4 is a graph showing a relationship between a gap between a sliding surface of a cylinder part 12 and an outer peripheral surface of an insulating member 20, and a film thickness of an alumite film formed on the sliding surface of the cylinder part 12. 本発明に係るアルマイト処理を施すマスタシリンダ部材の状態の他の例を説明する断面図である。It is sectional drawing explaining the other example of the state of the master cylinder member which performs the alumite process which concerns on this invention. アルミニウム製品の一例としてのマスタシリンダ部材を説明する断面図である。It is sectional drawing explaining the master cylinder member as an example of aluminum products.

符号の説明Explanation of symbols

１０ マスタシリンダ部材
１２ シリンダ部
１２ａ ブレーキレバーの押動部の挿入口
１２ｂ 出力ポート
１４ サプライポート用の貫通孔
１６ リリーフポート用の貫通孔
２０ 絶縁部材
２０ａ 鍔状部
２０ｂ 突出部 DESCRIPTION OF SYMBOLS 10 Master cylinder member 12 Cylinder part 12a Insertion port 12b of the pushing part of a brake lever Output port 14 Through hole 16 for supply ports Through hole 20 for relief ports Insulating member 20a Gutter-like part 20b Protrusion part

Claims (5)

筒状部を具備するアルミニウム製品を電解液に浸漬して陽極酸化し、前記アルミニウム製品の表面にアルマイト皮膜を形成するアルマイト処理を施す際に、
前記筒状部の内周面と接触する電解液量を前記アルミニウム製品の外面に比較して制限できるように、前記筒状部内に筒状の絶縁部材を挿入して、前記筒状部の内周面と絶縁部材の外周面との間に形成した所定間隙を、前記内周面に沿って形成し、
次いで、前記アルミニウム製品の筒状部の内周面を含む表面に陽極酸化を施すことを特徴とするアルマイト処理方法。 When anodized by immersing an aluminum product having a cylindrical part in an electrolytic solution and anodizing, and forming an alumite film on the surface of the aluminum product,
A cylindrical insulating member is inserted into the cylindrical portion so that the amount of the electrolyte solution in contact with the inner peripheral surface of the cylindrical portion can be limited as compared with the outer surface of the aluminum product. A predetermined gap formed between the peripheral surface and the outer peripheral surface of the insulating member is formed along the inner peripheral surface;
Then, the anodizing method characterized by anodizing the surface including the inner peripheral surface of the cylindrical part of the aluminum product. 筒状部を、前記筒状部の内径よりも小径の貫通孔が内壁面に開口されている筒状部とする請求項１記載のアルマイト処理方法。   The alumite treatment method according to claim 1, wherein the cylindrical portion is a cylindrical portion in which a through hole having a smaller diameter than the inner diameter of the cylindrical portion is opened on the inner wall surface. 筒状部を、挿入されたピストンが摺動する摺動面を内周面とするシリンダ部とする請求項１又は請求項２記載のアルマイト処理方法。   3. The alumite treatment method according to claim 1, wherein the cylindrical portion is a cylinder portion having a sliding surface on which the inserted piston slides as an inner peripheral surface. 筒状部の内周面と絶縁部材の周面との間の所定間隙を、１ｍｍ以下とする請求項１〜３のいずれか一項記載のアルマイト処理方法。   The alumite treatment method according to any one of claims 1 to 3, wherein a predetermined gap between the inner peripheral surface of the cylindrical portion and the peripheral surface of the insulating member is 1 mm or less. アルミニウム製品として、ピストンとカップシールとが摺動する摺動面を内周面とするシリンダ部を具備するマスタシリンダ部材を用い、前記シリンダ部に筒状の絶縁部材を挿入し、前記筒状部の摺動面と絶縁部材の表面との間に形成した所定間隙を、前記摺動面に沿って形成する請求項１〜４のいずれか一項記載のアルマイト処理方法。   As the aluminum product, a master cylinder member having a cylinder portion having an inner peripheral surface as a sliding surface on which the piston and the cup seal slide is inserted, and a cylindrical insulating member is inserted into the cylinder portion, and the cylindrical portion The alumite treatment method according to any one of claims 1 to 4, wherein a predetermined gap formed between the sliding surface and the surface of the insulating member is formed along the sliding surface.
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