JPS6214039B2 - - Google Patents
Info
- Publication number
- JPS6214039B2 JPS6214039B2 JP56038179A JP3817981A JPS6214039B2 JP S6214039 B2 JPS6214039 B2 JP S6214039B2 JP 56038179 A JP56038179 A JP 56038179A JP 3817981 A JP3817981 A JP 3817981A JP S6214039 B2 JPS6214039 B2 JP S6214039B2
- Authority
- JP
- Japan
- Prior art keywords
- anodic oxide
- oxide film
- hydraulic cylinder
- sodium
- aluminum alloy
- 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.)
- Expired
Links
Landscapes
- Actuator (AREA)
- Electrochemical Coating By Surface Reaction (AREA)
Description
【発明の詳細な説明】
本発明は、摺動表面に平滑な陽極酸化皮膜を持
つ油圧シリンダの製造法に関するものである。と
ころで、第１図に示す如き油圧シリンダ１の摺動
面３は、シール部材２が摺動するため、表面粗さ
を十点平均粗さで0.6〜2.5μ程度に仕上げる必要
がある。最近、軽量化を目的として、アルミニウ
ム合金を油圧シリンダ１に用いる傾向にあるが、
この場合、摺動面３に耐摩耗性を与えるため、陽
極酸化処理により、陽極酸化皮膜を生成させる必
要性を生ずる。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a hydraulic cylinder having a smooth anodic oxide coating on its sliding surface. By the way, since the sealing member 2 slides on the sliding surface 3 of the hydraulic cylinder 1 as shown in FIG. 1, it is necessary to finish the surface roughness to about 0.6 to 2.5 .mu.m in ten-point average roughness. Recently, there has been a trend to use aluminum alloy for the hydraulic cylinder 1 for the purpose of weight reduction.
In this case, in order to impart wear resistance to the sliding surface 3, it becomes necessary to generate an anodic oxide film by anodizing treatment.
にもかかわらず、従来のこの種のものは、アル
ミニウム合金としてシリコンを含有する加工性の
良いアルミニウム合金を用いて陽極酸化処理を行
うと、第７図と第８図に示す如く、その摺動面３
は十点平均粗さで５〜50μ程度の凹凸した陽極酸
化皮膜７が形成され、油圧シリンダ１の摺動面３
としては不適当なものになつてしまい、摺動表面
３を砥石や研摩紙布で後加工する必要がでてくる
という不具合があつた。 Nevertheless, when conventional products of this type are anodized using a silicon-containing aluminum alloy with good workability, as shown in Figures 7 and 8, the sliding Side 3
A rough anodic oxide film 7 with a ten-point average roughness of about 5 to 50 μm is formed on the sliding surface 3 of the hydraulic cylinder 1.
This results in a problem that the sliding surface 3 has to be post-processed using a grindstone or abrasive paper cloth.
そこで本発明は、この問題点を解決するため、
シリコンを含有するアルミニウム合金に0.001〜
0.1％のナトリウムを添加することにより、アル
ミニウム合金中のシリコンの結晶を微細化し、陽
極酸化処理における陽極酸化皮膜の表面粗さを後
加工が不要となる程度に小さくおさえることによ
つて、摺動表面に平滑な陽極酸化皮膜を持つ油圧
シリンダの製造法を提供することをその目的とす
るものである。 Therefore, in order to solve this problem, the present invention
0.001~ for aluminum alloys containing silicon
By adding 0.1% sodium, the silicon crystals in the aluminum alloy are made finer, and the surface roughness of the anodic oxide film during anodizing treatment is reduced to the extent that post-processing is not required, thereby improving sliding performance. The object of the present invention is to provide a method for manufacturing a hydraulic cylinder having a smooth anodic oxide film on its surface.
以下、本発明の一実施例を添付図面に基づいて
説明する。 Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings.
油圧シリンダ１は、シリコン４を含有するアル
ミニウム合金５で鋳造（工程Ｂ）される。このア
ルミニウム合金５とは、JISH5202に規定される
アルミニウム鋳物合金のうち、２種４種など、１
％以上のシリコン４を有効成分として含有するも
のである。この素材を鋳造（工程Ｂ）した時の組
織を第３図に示す。シリコン４の結晶粒は比較的
大きい。 The hydraulic cylinder 1 is cast from an aluminum alloy 5 containing silicon 4 (step B). This aluminum alloy 5 refers to one of the two types and four types of aluminum casting alloys specified in JISH5202.
% or more of silicon 4 as an active ingredient. Figure 3 shows the structure when this material was cast (process B). The crystal grains of silicon 4 are relatively large.
このアルミニウム合金５の溶湯中に0.001〜0.1
％のナトリウム６を添加（工程Ａ）し、このアル
ミニウム合金５を金型鋳造または砂型鋳造などの
方法で油圧シリンダ１を鋳造（工程Ｂ）した時の
組織を第４図に示す。ナトリウム６を添加（工程
Ａ）した時のシリコン結晶４′は、ナトリウム６
を添加しない時のシリコン結晶４より、微細化さ
れている。 0.001 to 0.1 in the molten aluminum alloy 5
FIG. 4 shows the structure of the aluminum alloy 5 after adding 6% of sodium (step A) and casting the hydraulic cylinder 1 by die casting or sand casting (step B). When sodium 6 is added (step A), silicon crystal 4' becomes sodium 6
The silicon crystal 4 is made finer than the silicon crystal 4 without the addition of .
次に、このように成形された油圧シリンダ１を
機械加工（工程Ｃ）により、第１図に示す如く、
所望の形状に切削し、シール部材２が摺動する摺
動面３に仕上げる。その後、陽極酸化処理（工程
Ｄ）により、前記摺動面３に陽極酸化皮膜７′を
生成させると、第５図および第６図で示すが如
き、表面が平滑で、粗さが小さく後加工を施す必
要のない摺動面３を持つ油圧シリンダ１が得られ
る。 Next, the thus formed hydraulic cylinder 1 is machined (step C) to form the hydraulic cylinder 1 as shown in FIG.
It is cut into a desired shape to form a sliding surface 3 on which the seal member 2 slides. After that, an anodic oxide film 7' is formed on the sliding surface 3 by anodizing treatment (step D), resulting in a smooth surface with small roughness and post-processing, as shown in FIGS. 5 and 6. A hydraulic cylinder 1 having a sliding surface 3 that does not require any treatment is obtained.
その理由は以下の通りである。シリコン４を含
有するアルミニウム合金５にナトリウム６を添加
Ａすると、第４図に示す如く、溶解したナトリウ
ム合金５が凝固する時、ナトリウム６が核となつ
て同時に多数のシリコン４の微細な球状の結晶
４′が生成する。そのため、このアルミニウム合
金５に陽極酸化処理Ｄを行つた場合、第５図およ
び第６図に示す如く、陽極酸化皮膜７′の生成を
妨害するシリコン４′が、陽極酸化皮膜７′の成長
に伴なつて、陽極酸化皮膜７′中に包み込まれる
形となり、表面が平滑で粗さの小さい陽極酸化皮
膜７′を得ることができるのである。 The reason is as follows. When sodium 6 is added to aluminum alloy 5 containing silicon 4, as shown in FIG. Crystals 4' are formed. Therefore, when the aluminum alloy 5 is subjected to the anodizing treatment D, as shown in FIGS. 5 and 6, the silicon 4' that obstructs the growth of the anodic oxide film 7' As a result, the anodic oxide film 7' is wrapped in the anodic oxide film 7', and the anodic oxide film 7' has a smooth surface and low roughness.
次に、本発明の具体的な一実施例を示すが、本
発明はこれにのみ限定されるものではない。この
実験においてアルミニウム合金製油圧シリンダ１
の組成として、JISH5202に規定されているアル
ミニウム鋳造合金AC4C5を用い、鋳造前に0.025
％のナトリウム６を溶湯に添加（工程Ａ）して、
鋳造成形（工程Ｂ）後、機械加工（工程Ｃ）を施
し、しかる後に、トリクレン脱脂を行い、次の条
件で陽極酸化処理（工程Ｄ）を行い、膜厚10μの
陽極酸化皮膜７′を形成した。 Next, a specific example of the present invention will be shown, but the present invention is not limited thereto. In this experiment, aluminum alloy hydraulic cylinder 1
As the composition, aluminum casting alloy AC4C5 specified in JISH5202 was used, and 0.025
Adding 6% of sodium to the molten metal (Step A),
After casting (process B), machining (process C) is performed, followed by trichlene degreasing, and anodizing treatment (process D) under the following conditions to form an anodic oxide film 7' with a film thickness of 10μ. did.
電解浴組成 30重量％硫酸
浴 温 20℃
電流密度 1.5A／ｄm2
このようにして得られた陽極酸化皮膜７′は、
表面が極めて平滑で、十点平均粗さで1.6μであ
つた。この時の陽極酸化皮膜７′の状態は第５図
および第６図に示す通りである。Electrolytic bath composition: 30% by weight sulfuric acid bath Temperature: 20°C Current density: 1.5A/dm 2The anodic oxide film 7' thus obtained is
The surface was extremely smooth, with a ten-point average roughness of 1.6μ. The state of the anodic oxide film 7' at this time is as shown in FIGS. 5 and 6.
これに対して、従来の具体的な比較例は次の通
りである。JISH5202に規定されているアルミニ
ウム鋳物合金AC4C5を用い、ナトリウムを添加
することなく、通常の鋳造成形（工程Ｂ）を行
い、しかるに、機械加工（工程Ｃ）を施して、第
１図の油圧シリンダ１を作成した。この油圧シリ
ンダ１をトリクレヲ脱脂後、本発明の一実施例と
同じ次の条件で陽極酸化処理（工程Ｄ）を行い、
膜厚10μの陽極酸化皮膜７′を形成した。 On the other hand, specific conventional comparative examples are as follows. Using aluminum casting alloy AC4C5 specified in JISH5202, ordinary casting (process B) was performed without adding sodium, and then machining (process C) was performed to form the hydraulic cylinder 1 shown in Fig. 1. It was created. After degreasing this hydraulic cylinder 1, it is anodized (step D) under the same conditions as in the embodiment of the present invention.
An anodic oxide film 7' having a thickness of 10 μm was formed.
電解浴組成 30重量％硫酸
浴 温 20℃
電流密度 1.5A／ｄm2
このようにして得られた陽極酸化皮膜７′の表
面粗さは、十点平均粗さで５μであつた。この時
の陽極酸化皮膜７の状態は第７図および第８図の
通りである。Electrolytic bath composition: 30% by weight sulfuric acid bath Temperature: 20° C. Current density: 1.5 A/dm 2 The surface roughness of the anodic oxide film 7' thus obtained was 5 μ in ten point average roughness. The state of the anodic oxide film 7 at this time is as shown in FIGS. 7 and 8.
以上の如く製造された本発明に係る油圧シリン
ダ１は、その摺動面３に平滑な陽極酸化皮膜７′
が形成されており、充分な耐摩耗性を有すると同
時に、砥石や研摩紙布で表面を研摩することな
く、そのままで油圧シリンダ１として用いること
ができる。従つて、研摩分に相当する余分の陽極
酸化皮膜を生成させるための電力を節約できると
同時に、研摩層が残つていて、シール部材２に傷
をつける等の心配も全くなく、省エネルギー、品
質向上に寄与し耐食性及び潤滑性に優れるもので
ある。 The hydraulic cylinder 1 according to the present invention manufactured as described above has a smooth anodic oxide coating 7' on its sliding surface 3.
is formed and has sufficient wear resistance, and at the same time, it can be used as the hydraulic cylinder 1 as it is without polishing the surface with a grindstone or abrasive paper cloth. Therefore, the power required to generate an extra anodic oxide film corresponding to the amount of polishing can be saved, and at the same time, there is no need to worry about the polishing layer remaining and damaging the sealing member 2, resulting in energy savings and quality. It contributes to improvement in corrosion resistance and lubricity.
第１図から第６図までの図は、本発明の摺動表
面に平滑な陽極酸化皮膜を持つ油圧シリンダの製
造法の一実施例を示すもので、第１図は油圧シリ
ンダの断面図、第２図は本発明に係る製造工程を
分り易く示した概略図、第３図は第２図のナトリ
ウム添加しないアルミニウム合金の組織図、第４
図は第２図のナトリウム添加後のアルミニウム合
金の組織図、第５図は陽極酸化皮膜の生成状態を
分り易くした拡大図、第６図は第５図に相当する
ナトリウム添加後のアルミニウム合金に施された
陽極酸化皮膜の拡大断面写真、第７図は従来のナ
トリウムを添加しないで陽極酸化皮膜を生成させ
た状態を示す拡大図、そして第８図は第７図に相
当する従来のナトリウムを添加しないで生成され
た陽極酸化皮膜の拡大断面写真である。
１：油圧シリンダ、２：シール部材、３：摺動
面、４：シリコン、５：アルミニウム合金、６：
ナトリウム、７：陽極酸化皮膜、Ａ：溶湯にナト
リウムを添加する工程、Ｂ：鋳造工程、Ｃ：機械
加工工程、Ｄ：陽極酸化処理工程。
The figures from FIG. 1 to FIG. 6 show an embodiment of the method for manufacturing a hydraulic cylinder having a smooth anodic oxide film on the sliding surface of the present invention, and FIG. 1 is a sectional view of the hydraulic cylinder; Fig. 2 is a schematic diagram showing the manufacturing process according to the present invention in an easy-to-understand manner, Fig. 3 is a structural diagram of the aluminum alloy shown in Fig. 2 without addition of sodium, and Fig. 4
The figure shows the structure of the aluminum alloy after the addition of sodium in Figure 2, Figure 5 is an enlarged view to make it easier to understand the state of formation of the anodic oxide film, and Figure 6 shows the aluminum alloy after the addition of sodium corresponding to Figure 5. Figure 7 is an enlarged cross-sectional photograph of the applied anodic oxide film, Figure 7 is an enlarged view showing the state in which the anodic oxide film was formed without adding conventional sodium, and Figure 8 is an enlarged cross-sectional photograph of the anodic oxide film formed without adding sodium. It is an enlarged cross-sectional photograph of an anodic oxide film produced without addition. 1: Hydraulic cylinder, 2: Seal member, 3: Sliding surface, 4: Silicon, 5: Aluminum alloy, 6:
Sodium, 7: Anodized film, A: Adding sodium to molten metal, B: Casting process, C: Machining process, D: Anodizing process.
Claims (1)
に、ナトリウムを0.001〜0.1％添加し、ただちに
鋳造した後、機械加工を施し、更にシリンダの摺
動面に低電流密度の陽極酸化処理を施して、前記
摺動面に微細なシリコン粒子を分散状態で内含す
る陽極酸化皮膜を有する油圧シリンダーの製造方
法。1 Add 0.001 to 0.1% sodium to a molten aluminum alloy containing silicon, immediately cast it, then machine it, and then apply low current density anodic oxidation treatment to the sliding surface of the cylinder. A method for manufacturing a hydraulic cylinder having an anodized film containing fine silicon particles in a dispersed state on its moving surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3817981A JPS57152493A (en) | 1981-03-17 | 1981-03-17 | Manufacture of hydraulic cylinder having smooth anodic oxide film on sliding surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3817981A JPS57152493A (en) | 1981-03-17 | 1981-03-17 | Manufacture of hydraulic cylinder having smooth anodic oxide film on sliding surface |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57152493A JPS57152493A (en) | 1982-09-20 |
| JPS6214039B2 true JPS6214039B2 (en) | 1987-03-31 |
Family
ID=12518154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3817981A Granted JPS57152493A (en) | 1981-03-17 | 1981-03-17 | Manufacture of hydraulic cylinder having smooth anodic oxide film on sliding surface |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57152493A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0318340U (en) * | 1989-07-04 | 1991-02-22 |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4680973B2 (en) * | 2006-11-06 | 2011-05-11 | Ｇａｓｔ Ｊａｐａｎ 株式会社 | Manufacturing method of bearing, bearing unit, rotating device, and manufacturing method of sliding member |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5250152U (en) * | 1975-10-08 | 1977-04-09 |
-
1981
- 1981-03-17 JP JP3817981A patent/JPS57152493A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0318340U (en) * | 1989-07-04 | 1991-02-22 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57152493A (en) | 1982-09-20 |
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