JP3173887B2 - Anodizing pretreatment method for Al alloy die casting material - Google Patents
Anodizing pretreatment method for Al alloy die casting materialInfo
- Publication number
- JP3173887B2 JP3173887B2 JP27058792A JP27058792A JP3173887B2 JP 3173887 B2 JP3173887 B2 JP 3173887B2 JP 27058792 A JP27058792 A JP 27058792A JP 27058792 A JP27058792 A JP 27058792A JP 3173887 B2 JP3173887 B2 JP 3173887B2
- Authority
- JP
- Japan
- Prior art keywords
- oxide film
- anodic oxide
- alloy die
- treatment
- cast
- 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 - Fee Related
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- Other Surface Treatments For Metallic Materials (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明はボイドによる凹凸部を表
面に生じることなく地金強度を向上すると同時に、生産
性の高い状態で陽極酸化被膜を形成できる前処理方法に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pretreatment method capable of improving an ingot strength without forming irregularities due to voids on the surface and forming an anodized film with high productivity.
【０００２】[0002]
【従来の技術】従来、ＪＩＳ規定のＡＤＣー１０、１２
などを中心とするＡｌ合金ダイカスト材は、例えば、自
動車のバルブロッカアームや回転部の軸受け、その他に
使用されているが、耐摩耗性などの優れた機械特性が要
求される部分には、切削加工が施された後に陽極酸化処
理や潤滑処理が行なわれて実用に供されている。これら
のＡｌ合金ダイカスト材を陽極酸化する場合、ダイカス
ト鋳肌面のチル層や湯流層が陽極酸化時の抵抗層となっ
て皮膜の生成を抑制しやすいために、得られた酸化皮膜
は薄くなる傾向がある。一方、Ａｌ合金ダイカスト材を
切削した面では、この面の表皮が削除されるために、陽
極酸化処理で形成される皮膜は割合成長し易く、耐摩耗
性を得るために十分な厚さと硬さの陽極酸化皮膜を工業
的に容易に作成可能である。2. Description of the Related Art Conventionally, ADC-10, 12 defined by JIS has been adopted.
Aluminum alloy die-casting materials mainly used for, for example, valve rocker arms for automobiles, bearings for rotating parts, etc., are used for cutting parts where excellent mechanical properties such as wear resistance are required. , Anodizing treatment and lubrication treatment are carried out, and the product is put to practical use. When anodizing these Al alloy die-cast materials, the resulting oxidized film is thin because the chill layer or the molten metal layer on the die-cast surface becomes a resistance layer at the time of anodic oxidation and it is easy to suppress the formation of the film. Tend to be. On the other hand, on the surface obtained by cutting the Al alloy die-cast material, the skin formed on the surface is removed, so that the film formed by the anodic oxidation treatment tends to grow at a high rate, and has a sufficient thickness and hardness to obtain abrasion resistance. Can be easily produced industrially.
【０００３】一方、最近は機械部品の軽量化が推し進め
られ、これらのＡｌ合金ダイカスト材にもかなり苛酷な
強度を要求されるようになってきている。そのため、Ｓ
ｉを７.５〜１２％程度含有させているＡＤＣー１０、
１２に代わるような更に高濃度のＳｉを含有させたＡｌ
合金ダイカスト材や、粉末冶金法による高強度、耐摩耗
性材料の開発と実用化、あるいは、陽極酸化皮膜やメッ
キ処理などを行なわずに耐摩耗性に優れさせた材料を提
供することも進んでいるが、コストの問題や後加工時の
加工性の問題があることから、前記ＡＤＣー１０、１２
を使用する機会はまだまだ多いのが実情である。そのた
め、現状のＡＤＣー１０、１２などのダイカスト材の強
化を考える場合、通常の冶金学的な考え方によれば、焼
き入れ、焼き戻しによる手法（Ｔ６処理）が一般的であ
る。On the other hand, recently, weight reduction of mechanical parts has been promoted, and these aluminum alloy die-cast materials have been required to have considerably severe strength. Therefore, S
ADC-10 containing about 7.5 to 12% of i
Al containing higher concentration of Si instead of 12
Development and commercialization of alloy die-casting materials and high-strength, wear-resistant materials by powder metallurgy, or providing materials with excellent wear resistance without performing anodic oxide coating or plating, etc. However, the ADC-10 and the ADC-12 have problems due to cost and workability during post-processing.
In fact, there are still many opportunities to use. Therefore, when considering the strengthening of die cast materials such as the current ADCs 10 and 12, according to an ordinary metallurgical concept, a method of quenching and tempering (T6 treatment) is generally used.
【０００４】[0004]
【発明が解決しようとする課題】ところが、この方法に
よると、焼き入れのために４５０℃程度に加熱して急令
する溶体化処理を行うので、加熱によりダイカスト材の
内部にボイド（ブロ−ホ−ル）が生成し、これが表面に
突出して凹凸部を形成し、外観不良が生じるとともに、
切削した場合にはその部分に凹みができるという問題が
ある。However, according to this method, since the solution treatment is carried out by heating to about 450 ° C. for quenching, and the heat treatment is carried out rapidly, the voids (blowing) are formed inside the die casting material by heating. −) Is generated, which protrudes from the surface to form an uneven portion, resulting in poor appearance and
When cut, there is a problem that a dent is formed in that portion.
【０００５】さらにまた、溶体化処理を行なうＴ６処理
では、ダイカスト材の鋳肌層近傍でも切削面と同様に十
分に溶体化がなされ、再度、微細にＳｉ粒子が緻密に析
出してくるので、陽極酸化処理における皮膜の成長具合
は鋳肌面でも切削面でもあまり変わりのない程度にな
り、陽極酸化の感受性は鋳肌面でも切削面でも良好とな
る。従って、耐摩耗性を必要とする切削面に陽極酸化皮
膜を厚く形成しようとする場合に、あまり耐摩耗性を必
要としない鋳肌面にも陽極酸化皮膜が厚く形成されるこ
とになり、その分処理時間が長くなり、生産性が悪くな
るとともに、余分な電力を消費することになり、生産コ
ストが高くなるという問題がある。これに対し、ダイカ
スト後切削加工しただけのものでは、前述したような理
由から、不要な鋳肌面には皮膜が薄くしか形成されず、
耐摩耗性を必要とする切削面には十分な厚さの皮膜を短
時間で効率良く形成できるという利点がある。しかしな
がら、このダイカストしたままのものでは、素地の硬度
がＴ６処理したものに比べ、１０％以上も低いために、
より苛酷な使用状態においては問題となる場合がある。Further, in the T6 treatment for performing the solution treatment, the solution is sufficiently dissolved even in the vicinity of the casting surface layer of the die-casting material as in the case of the cut surface, and fine Si particles are deposited again finely and densely. The degree of growth of the film in the anodizing treatment does not change much on the cast surface and the cut surface, and the sensitivity of the anodization is good on both the cast surface and the cut surface. Therefore, when trying to form a thick anodic oxide film on a cutting surface that requires wear resistance, a thick anodic oxide film is also formed on the casting surface that does not require much wear resistance. However, there is a problem in that the processing time becomes longer, the productivity becomes worse, and extra power is consumed, thereby increasing the production cost. On the other hand, in the case of only cutting after die casting, only a thin film is formed on the unnecessary casting surface, for the reasons described above,
There is an advantage that a film having a sufficient thickness can be efficiently formed in a short time on a cut surface requiring wear resistance. However, in the case of this die-casted material, the hardness of the substrate is 10% or less lower than that of the T6-treated material.
This can be problematic in more severe use conditions.
【０００６】以上の問題点を理解しやすいように図式化
すると図３（ａ）、（ｂ）のようになる。まず、図３
（ａ）はダイカストしたままのＡｌ合金ダイカスト材に
対してその上面を切削加工した後に陽極酸化被膜を形成
した状態を示す。この図３（ａ）から明らかなように、
このダイカスト材１では、切削面には厚い陽極酸化被膜
２が生成し、他の部分には薄い陽極酸化被膜３が生成す
る。また、図３（ｂ）はＡｌ合金ダイカスト材に対して
上面を切削加工した後にＴ６処理を行い、その後に陽極
酸化被膜を形成した状態を示す。このダイカスト材５で
は、全面に均一な厚さの陽極酸化被膜６が生成するとと
もに、ボイドによる凹凸部７が表面部に多数形成され
る。FIG. 3A and FIG. 3B show the above problems in a schematic form for easy understanding. First, FIG.
(A) shows a state in which an anodized film is formed after cutting the upper surface of the die-cast Al alloy material as it is. As is apparent from FIG.
In this die casting material 1, a thick anodic oxide film 2 is formed on the cutting surface, and a thin anodic oxide film 3 is formed on other portions. FIG. 3 (b) shows a state in which the upper surface of the Al alloy die-cast material is cut, T6 treatment is performed, and then an anodic oxide film is formed. In the die casting material 5, an anodic oxide film 6 having a uniform thickness is formed on the entire surface, and a number of irregularities 7 due to voids are formed on the surface.
【０００７】従って以上のことから、結局、従来は、ダ
イカストのままで、必要な面（切削面）の陽極酸化処理
時間を短縮するのが良いか、あるいは、陽極酸化処理時
間を延長し、Ａｌ合金ダイカスト材の素地に若干のボイ
ドや突起を生成させてもその強度を若干でも向上させる
ためのＴ６処理を行なうことが良いか、どちらか一方を
選択せざるを得ない状況であった。このような２者択一
の状況下において本発明者らは、更に実用性があり、工
業的なＡｌ合金の素地強化と、従来通りの切削面の陽極
酸化皮膜形成能力の大きさの両方を発揮できるような優
れた方法を鋭意研究中であった。[0007] Therefore, from the above, in the end, conventionally, it is better to shorten the anodizing time of the necessary surface (cut surface) while maintaining the die casting, or to extend the anodizing time of Al Even if some voids and projections are formed on the base material of the alloy die-casting material, it is necessary to select one of the two methods. Under such an alternative situation, the present inventors have further practicality, and have considered both the industrial strength strengthening of the Al alloy base and the conventional ability to form an anodized film on the cut surface. We have been studying excellent methods that can be used.
【０００８】本発明は前記事情に鑑みてなされたもので
あり、切削面には所用厚さの陽極酸化被膜を容易に形成
することができるとともに耐摩耗性を余り必要としない
鋳肌面には必要最低限程度の薄い陽極酸化被膜しか形成
されず、Ａｌ合金ダイカスト材の素地の強度も従来のＴ
６熱処理品と同程度に高くすることができる陽極酸化前
処理方法を提供することを目的とする。The present invention has been made in view of the above-mentioned circumstances, and an anodic oxide film having a required thickness can be easily formed on a cut surface, and a cast surface which does not require much wear resistance can be formed. Only the necessary minimum anodic oxide coating is formed, and the strength of the Al alloy die-cast material
6 An object of the present invention is to provide an anodizing pretreatment method that can be made as high as a heat-treated product.
【０００９】[0009]
【課題を解決するための手段】請求項１記載の発明は前
記課題を解決するために、Ａｌ合金ダイカスト材を切削
加工した後に陽極酸化処理するに際し、陽極酸化処理の
前に、溶体化処理を行なわずにＡｌ合金の溶体化温度よ
りも低い１８０〜２００℃の温度に加熱した後に冷却
し、その後に陽極酸化処理するものである。According to a first aspect of the present invention, in order to solve the above-mentioned problems, when anodizing is performed after cutting an Al alloy die-cast material, a solution treatment is performed before the anodizing. Without heating, it is heated to a temperature of 180 to 200 [deg.] C. lower than the solution temperature of the Al alloy, cooled, and then anodized.
【００１０】[0010]
【作用】本発明らは、前記問題の解決策として、ＡＤＣ
ー１０、１２などの場合、４５０℃までの高温加熱によ
る溶体化処理を行なうことを省略し、即ち、焼き入れと
焼き戻しを行なうＴ６処理から溶体化処理を省略し、１
９０℃程度の焼き戻し処理のみを行なったところ、Ａｌ
合金ダイカスト材の表面にボイドや突起の発生が全くな
く、素地の硬度もＴ６処理の場合と同等のレベルを得る
ことができることを知見した。この場合、更に驚くこと
には、陽極酸化処理において、その鋳肌面と切削面とで
は、ダイカスト状態のままの時と殆ど変わりなく、鋳肌
面では陽極酸化皮膜の成長が少なく、切削面では陽極酸
化皮膜が良好に生成することを多数の実験試料観察の結
果確認できた。The present invention provides ADC as a solution to the above problem.
In the case of -10, 12, etc., the solution treatment by heating at a high temperature up to 450 ° C. is omitted, that is, the solution treatment is omitted from the T6 treatment of quenching and tempering, and 1
When only tempering at about 90 ° C. was performed, Al
It was found that no voids or protrusions were generated on the surface of the alloy die-cast material, and that the hardness of the substrate could be at the same level as in the case of T6 treatment. In this case, more surprisingly, in the anodic oxidation treatment, the cast surface and the cut surface are almost the same as in the die-cast state, the growth of the anodic oxide film on the cast surface is small, and the cut surface Observation of many experimental samples confirmed that the anodic oxide film was formed favorably.
【００１１】これは、金属組織学的に見て、特に過飽和
してＡｌα相中に固溶されたＳｉが溶体化処理まで行な
わなくとも、低い焼き戻し温度域、即ち、１８０〜２０
０℃の温度で実用上必要十分なＳｉ量の微細析出がα相
中に発生するためであると思われる。これにより、Ａｌ
合金ダイカスト材の素地強度（硬度）は、焼き入れ焼き
戻しを伴うＴ６処理の場合と同様に向上するが、前記の
低い焼き戻し温度域では、鋳肌面近傍のチル層や湯流れ
層、初析層までは熱処理の影響（軟化や析出）が及ばな
いために、陽極酸化被膜生成に大きな影響を生じること
がなく、この部分での陽極酸化被膜生成は遅くなり、ま
た、切削面側でも切削量があまり深くない範囲では、過
飽和固溶相からのＳｉの析出も少なく、この面でも陽極
酸化特性はダイカスト材のみの切削面の時と何等変わる
ことはなく、良好な酸化皮膜の成長ができるものと思わ
れる。From the viewpoint of metallography, this is because even if supersaturated Si solid-dissolved in the Alα phase is not subjected to solution treatment, the tempering temperature is low, that is, 180 to 20%.
This is presumably because fine precipitation of a practically necessary and sufficient Si amount occurs in the α phase at a temperature of 0 ° C. Thereby, Al
The base strength (hardness) of the alloy die-cast material is improved in the same manner as in the case of T6 treatment involving quenching and tempering. However, in the low tempering temperature range, the chill layer, the molten metal flow layer, Since the influence of heat treatment (softening and precipitation) does not reach the deposited layer, there is no significant effect on the formation of the anodic oxide film, the formation of the anodic oxide film in this part is slow, and the cutting surface is also cut. In the range where the amount is not too deep, the precipitation of Si from the supersaturated solid solution phase is also small, and even on this surface, the anodic oxidation characteristics do not change at all and do not change from the case of the cutting surface using only the die cast material, and a good oxide film can be grown. It seems to be.
【００１２】以下に本発明方法を更に詳細に説明する。
本発明方法においては、切削加工がなされて更に陽極酸
化処理が施されるＡｌ合金ダイカスト材において、切削
加工後にＡｌ合金ダイカスト材を陽極酸化処理する前
に、４５０℃程度に加熱してから急冷する溶体化処理を
行なわずに、代わりに、溶体化処理温度よりも低い１８
０〜２００℃の範囲の温度に、２〜８時間程度加熱した
後で冷却する処理を施すものである。前記切削加工にお
いては、少なくとも０.１ｍｍ以上で１ｍｍ程度までの
深さの切削を行なってダイカスト材の精度や寸法を出す
ことが好ましい。この処理の後で通常の陽極酸化処理を
施す。ここでの陽極酸化処理は、硫酸浴などの公知の電
界浴を用いて良く、定電流電解などの方法を実施してＡ
ｌ合金ダイカスト材の表面に陽極酸化皮膜を形成する。
この場合、切削加工された部分では、鋳造のままの鋳肌
の部分よりも陽極酸化被膜が成長しやすいので、厚い陽
極酸化被膜が短時間で生成する。即ち、切削加工した部
分の陽極酸化被膜が厚くなって、その他の部分の陽極酸
化被膜が薄くなる。これにより、耐摩耗性が必要な切削
加工部分には厚い陽極酸化被膜を確実に生成させること
ができる。また、溶体化処理を行わないようにしてＡｌ
合金ダイカスト材にボイドを生じさせることなく素地の
強化ができる。Hereinafter, the method of the present invention will be described in more detail.
In the method of the present invention, in the Al alloy die-casting material which is subjected to the cutting process and further subjected to the anodic oxidation treatment, before the anodizing treatment of the Al alloy die-casting material after the cutting process, it is heated to about 450 ° C. and then rapidly cooled. No solution treatment is performed, but instead a solution treatment temperature 18
The heating is performed at a temperature in a range of 0 to 200 ° C. for about 2 to 8 hours, and then a cooling process is performed. In the cutting process, it is preferable to obtain a precision and a dimension of the die-cast material by performing a cutting of at least 0.1 mm or more and a depth of about 1 mm. After this treatment, a normal anodic oxidation treatment is performed. The anodic oxidation treatment here may be performed using a known electric field bath such as a sulfuric acid bath.
An anodic oxide film is formed on the surface of the 1-alloy die-cast material.
In this case, since the anodic oxide film grows more easily in the cut portion than in the cast surface as it is, a thick anodic oxide film is generated in a short time. That is, the anodic oxide film in the cut portion becomes thick, and the anodic oxide film in the other portions becomes thin. As a result, a thick anodic oxide film can be reliably formed on the cut portion requiring wear resistance. Also, the solution treatment is not performed so that Al
The substrate can be reinforced without causing voids in the alloy die-cast material.
【００１３】これらのことは、金属組織学的に見て、特
に過飽和してＡｌα相中に固溶されたＳｉが溶体化処理
まで行なわなくとも、低い焼き戻し温度域、即ち、１８
０〜２００℃の温度で実用上必要十分なＳｉ量の微細析
出がα相中に発生するためであると思われる。これによ
り、Ａｌ合金ダイカスト材の素地強度（硬度）は、焼き
入れ焼き戻しを伴うＴ６処理の場合と同様に向上する
が、前記の低い焼き戻し温度域では、鋳肌面近傍のチル
層や湯流れ層、初析層までは熱処理の影響（軟化や析
出）が及ばないために、陽極酸化被膜生成に大きな影響
を生じることがなく、また、切削面側でも切削量があま
り深くない範囲では、過飽和固溶相からのＳｉの析出も
少なく、この面でも陽極酸化特性はダイカスト材のみの
切削面の時と何等変わることはなく、良好な酸化皮膜の
成長ができるものによると思われる。From the viewpoint of metallography, these facts indicate that even if Si which is supersaturated and solid-dissolved in the Alα phase is not subjected to solution treatment, the tempering temperature is low, that is, 18 ° C.
This is presumably because fine precipitation of a practically necessary and sufficient Si amount occurs in the α phase at a temperature of 0 to 200 ° C. As a result, the base strength (hardness) of the Al alloy die-casting material is improved in the same manner as in the case of the T6 treatment involving quenching and tempering, but in the low tempering temperature range, the chill layer or hot water near the casting surface is hardened. Since the influence of heat treatment (softening and precipitation) does not reach the flow layer and the proeutectoid layer, there is no significant effect on the formation of the anodic oxide film, and in the range where the cutting amount is not too deep on the cutting surface side, The precipitation of Si from the supersaturated solid solution phase is also small, and the anodic oxidation characteristics are not changed at all on this surface as well as on the cut surface of the die-cast material alone, and it is considered that the oxide film can be favorably grown.
【００１４】以上のことから、前記の方法を実施するこ
とで、図１に示すように、素地１１の強度が高く、上面
の切削面１２には厚い陽極酸化被膜１３を有し、その他
の鋳肌面では薄い陽極酸化被膜１４を有するＡｌ合金ダ
イカスト材１０を得ることができる。また、前記のよう
に構成するならば、余計な厚さの陽極酸化被膜を形成し
ていないので、陽極酸化処理の時間を短縮することがで
き、生産効率も高いのでＡｌ合金ダイカスト材を従来よ
りも安価に製造することができる。また、前記方法によ
れば、４５０℃程度に加熱する溶体化処理は不用になる
ので、高温加熱炉や水冷装置は必要なくなり、代わりに
２００℃程度に加熱できる一般的な安価な加熱炉があれ
ば処理できるので、設備コストと製造コストも安くな
る。From the above, by performing the above method, as shown in FIG. 1, the strength of the base material 11 is high, the cut surface 12 on the upper surface has a thick anodic oxide film 13, On the skin surface, an Al alloy die-cast material 10 having a thin anodic oxide film 14 can be obtained. In addition, if configured as described above, since an unnecessary anodic oxide film is not formed, the time of anodic oxidation treatment can be reduced, and the production efficiency is high. Can also be manufactured at low cost. Further, according to the above method, a solution heat treatment of heating to about 450 ° C. becomes unnecessary, so that a high-temperature heating furnace or a water-cooling device is not required, and instead, there is a general inexpensive heating furnace that can heat to about 200 ° C. If it can be processed, equipment costs and manufacturing costs are also reduced.
【００１５】[0015]
【実施例】日本アルミニウムダイカスト協会製のＡＤＣ
１２からなる３×７０×１５０ｍｍの複数の標準試料に
対してそれぞれの片面を０. ３ｍｍ、０. ３Ｓ面になる
ように研削した。次に、以下の試料１〜４を作成した。 試料１：ダイカストのまま（as cast 材）の試料。 試料２：前記試料１を４５０℃で２時間加熱後、水中急
冷した試料。 試料３：前記試料２を１９０℃で４時間加熱後徐冷した
もの。 試料４：前記試料１を１９０℃で４時間加熱後徐冷した
もの。 次いで前記各試料について、計算上１５μｍ厚の陽極酸
化皮膜を生成させるべく、２５％硫酸浴中にて１０℃で
２５分間、定電流電解を行ない、その後切断して埋め込
み試料としてから顕微鏡観察により皮膜厚さを測定し
た。なお、陽極酸化開始後２５分の時の電解電圧を求め
るとともに、前記埋め込み試料を用いて素地のマイクロ
ビッカース硬度 (Hv) を測定した。この際、鋳肌面の陽
極酸化皮膜厚さに対する切削面の陽極酸化皮膜厚さの比
を求めた。以上の結果を下記の表１に示す。 （以下、余白）[Example] ADC manufactured by Japan Aluminum Die Casting Association
A plurality of 12 × 3 × 70 × 150 mm standard samples were ground so that each side had a 0.3 mm, 0.3S plane. Next, the following samples 1 to 4 were prepared. Sample 1: A sample as-cast (as cast material). Sample 2: A sample which was heated at 450 ° C. for 2 hours and then quenched in water. Sample 3: Sample 2 was heated at 190 ° C. for 4 hours and then gradually cooled. Sample 4: Sample 1 was heated at 190 ° C. for 4 hours and then gradually cooled. Next, in order to form a 15 μm thick anodic oxide film on each of the samples, constant current electrolysis was performed at 25 ° C. in a 25% sulfuric acid bath at 10 ° C. for 25 minutes. The thickness was measured. The electrolytic voltage at 25 minutes after the start of the anodization was determined, and the micro Vickers hardness (Hv) of the substrate was measured using the embedded sample. At this time, the ratio of the thickness of the anodic oxide film on the cut surface to the thickness of the anodic oxide film on the casting surface was determined. The above results are shown in Table 1 below. (Hereinafter, margin)
【００１６】[0016]
【表１】 （表１）
┌─────────┬────┬─────┬──────┬──────┐ │ 特性 │ 試料１ │ 試料２ │ 試料３ │ 試料４ │ ├─┬───────┼────┼─────┼──────┼──────┤ │硬│鋳肌面 (Hv) │ ９１ │ ７５ │ １００ │ １０４ │ │度│切削面 (Hv) │ ８２ │ ６８ │ ９５ │ ９３ │ ├─┼───────┼────┼─────┼──────┼──────┤ │膜│鋳肌面( μｍ) │ ７ │ １０ │ １２ │ ８ │ │厚│切削面( μｍ) │ １５ │ １１ │ １３ │ １６ │ ├─┴───────┼────┼─────┼──────┼──────┤ │ 膜厚比 │ │ │ │ │ │( 切削面／鋳肌面) │ ２. １ │ １. １ │ １. １ │ ２. ０ │ ├─────────┼────┼─────┼──────┼──────┤ │ 電解電圧（Ｖ） │ ５１ │ ３９ │ ３８ │ ５０ │ ├─────────┼────┼─────┼──────┼──────┤ │ 外 観 │異常なし│ボイドの突│ボイドの突 │ 異常なし │ │ │ 良好 │起多数発生│起多数発生 │ 良好 │ └─────────┴────┴─────┴──────┴──────┘[Table 1]
│ │ Properties │ Sample 1 │ Sample 2 │ Sample 3 │ Sample 4 │ ├─┬───────┼────┼─────┼──────┼──────┤ │ Hard │ Cast surface (Hv) │ 91 │ 75 │ 100 │ 104 │ │ degree │ cutting surface (Hv) │ 82 │ 68 │ 95 │ 93 │ ├─┼───────┼────┼─────┼──────膜 │ membrane │ casting surface (μm) │ 7 │ 10 │ 12 │ 8 │ │ thickness │ cutting surface (μm) │ 15 │ 11 │ 13 │ 16 │ ├─┴────膜厚 │ Film thickness ratio │ │ │ │ │ │ │ (cut surface / cast surface) │ 2. 1 │ 1.1 │ 1.1 │ │ 2.0 │ ├─────────┼────┼─────┼───── ─┼──────┤ │ Electrolysis voltage (V) │ 51 │ 39 │ 38 │ 50 │ ├─────────┼────┼─────┼──── │ │ Appearance │ No abnormality │ Void protrusion │ Void protrusion │ No abnormality │ │ │ Good │ Many occurrences │ Many occurrences │ Good │ └─────── ──┴────┴─────┴──────┴──────┘
【００１７】表１において、試料４が本発明方法に係る
試料であるが、この試料の強度は容体化処理している試
料３の強度と同等に優れ、その他の試料よりも高くなっ
ている。また、試料４の陽極酸化被膜の厚さは、試料１
のものと同等の傾向を示し、切削面の方が鋳肌面よりも
厚くなっているとともに、ボイドなどによる表面の凹凸
も見られない。以上のことから、前記方法を実施するこ
とで、切削面に優先的に厚い陽極酸化被膜を形成でき、
鋳肌面に薄い陽極酸化被膜を形成でき、素地の強度も高
いＡｌ合金ダイカスト材を製造できることが明らかにな
った。In Table 1, Sample 4 is a sample according to the method of the present invention, and the strength of this sample is as good as that of Sample 3 which has been subjected to the embedding treatment, and is higher than the other samples. The thickness of the anodic oxide coating of Sample 4 was
It shows the same tendency as that of No. 1, and the cut surface is thicker than the casting surface, and no surface irregularities due to voids or the like are observed. From the above, by performing the above method, it is possible to preferentially form a thick anodic oxide coating on the cut surface,
It has been clarified that a thin anodic oxide film can be formed on the casting surface and that an Al alloy die-cast material having a high substrate strength can be manufactured.
【００１８】図２は本発明方法を実施して得られたロッ
カア−ムの一例を示すもので、このロッカア−ム２０
は、Ａｌ合金ダイカストから切削加工により製造された
もので、端部２１側の受座２２の部分が切削加工され、
中央部の軸受部２３が切削加工され、その他の部分は鋳
肌面となっているが、耐摩耗性に優れる必要がある受座
２２の部分と軸受部２３に厚い陽極酸化被膜２４が形成
され、その他の部分に薄い陽極酸化被膜が形成されてい
る。このように、必要な部分に厚い陽極酸化被膜２４を
形成でき、不要な部分に薄い陽極酸化被膜を形成できる
ので、陽極酸化処理時間を短縮できて耐摩耗性にも優れ
させることができる。FIG. 2 shows an example of a rocker arm obtained by carrying out the method of the present invention.
Is manufactured by cutting from an Al alloy die casting, and a portion of the receiving seat 22 on the end 21 side is cut,
The central bearing portion 23 is cut and the other portions are cast surfaces, but a thick anodic oxide film 24 is formed on the bearing portion 23 and the bearing portion 23 which need to have excellent wear resistance. And a thin anodic oxide film is formed on other portions. As described above, a thick anodic oxide film 24 can be formed on a necessary portion, and a thin anodic oxide film can be formed on an unnecessary portion. Therefore, the anodic oxidation treatment time can be shortened and the wear resistance can be improved.
【００１９】[0019]
【発明の効果】以上説明したように本発明方法において
は、切削加工を施してから陽極酸化処理を施すＡｌ合金
ダイカスト材の前処理方法において、切削加工後にＡｌ
合金ダイカスト材を陽極酸化処理する前に、従来４５０
℃程度に加熱してから急冷していた溶体化処理を行なわ
ずに、代わりに、溶体化処理温度よりも低い１８０〜２
００℃の範囲の温度に加熱した後で冷却する処理を施
し、この処理の後で通常の陽極酸化処理を施す。この場
合、切削加工された部分では、鋳造のままの鋳肌の部分
よりも陽極酸化被膜が成長しやすいので、厚い陽極酸化
被膜が生成する。即ち、切削加工した部分の陽極酸化被
膜が厚くなって、その他の部分の陽極酸化被膜が薄くな
る。これにより、耐摩耗性が必要な切削加工部分には厚
い陽極酸化被膜を確実に生成させることができる。ま
た、溶体化処理を行わないようにしてＡｌ合金ダイカス
ト材にボイドを生じさせることなく素地の強化ができ
る。従って、必要な部分に必要な厚さの陽極酸化被膜を
生成させるとともに不要な部分は薄い陽極酸化被膜を形
成でき、しかも強度の高いＡｌ合金ダイカスト材の前処
理方法を提供することができる。As described above, according to the method of the present invention, in the pretreatment method of the Al alloy die-cast material, which is subjected to the cutting process and then subjected to the anodic oxidation treatment,
Before anodizing the alloy die-cast material, the conventional 450
Instead of performing the solution treatment which was rapidly cooled after heating to about ℃, instead of 180 to 2 which is lower than the solution treatment temperature.
After heating to a temperature in the range of 00 ° C., a cooling process is performed, and after this process, a normal anodizing process is performed. In this case, a thick anodic oxide film is generated in the cut portion because the anodic oxide film grows more easily than in the cast surface portion as cast. That is, the anodic oxide film in the cut portion becomes thicker, and the anodic oxide film in the other portions becomes thinner. As a result, a thick anodic oxide film can be reliably formed on the cut portion requiring wear resistance. In addition, the base material can be reinforced without causing a void in the Al alloy die casting material by not performing the solution treatment. Therefore, an anodic oxide film having a required thickness can be formed at a necessary portion, and a thin anodic oxide film can be formed at an unnecessary portion. In addition, a high-strength pretreatment method for an Al alloy die-cast material can be provided.
【図１】図１は本発明に係る方法によって処理した後に
陽極酸化処理を施したＡｌ合金ダイカスト材の断面図で
ある。FIG. 1 is a cross-sectional view of an Al alloy die-cast material that has been subjected to anodization after being processed by the method according to the present invention.
【図２】図２は本発明方法を適用して製造されたロッカ
ア−ムの側面図である。FIG. 2 is a side view of a rocker arm manufactured by applying the method of the present invention.
【図３】図３（ａ）は鋳造後に特別な処理を施さずに陽
極酸化処理を施したＡｌ合金ダイカスト材の断面図、図
３（ｂ）は鋳造後にＴ６処理を施した後に陽極酸化処理
を施したＡｌ合金ダイカスト材の断面図である。FIG. 3 (a) is a cross-sectional view of an Al alloy die-cast material which has been subjected to anodizing without performing any special treatment after casting, and FIG. 3 (b) is an anodizing treatment after performing T6 treatment after casting. FIG. 3 is a cross-sectional view of an Al alloy die-casting material subjected to the following.
１０ Ａｌ合金ダイカスト材、 １１ 素地、 １３、１４ 陽極酸化皮膜、 10 Al alloy die casting material, 11 Base, 13, 14 Anodized film,
フロントページの続き (56)参考文献 特開 昭60−56094（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C25D 11/00 - 11/24 Continuation of the front page (56) References JP-A-60-56094 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) C25D 11/00-11/24
Claims (1)
に陽極酸化処理するに際し、陽極酸化処理の前に、溶体
化処理を行なわずにＡｌ合金の溶体化温度よりも低い１
８０〜２００℃の温度に加熱した後に冷却し、その後に
陽極酸化処理することを特徴とするＡｌ合金ダイカスト
材の陽極酸化前処理方法。When anodizing is performed after cutting an Al alloy die-casting material, the temperature is lower than the solution temperature of the Al alloy without performing a solution treatment before the anodizing process.
An anodizing pretreatment method for an aluminum alloy die-casting material, which comprises heating to a temperature of 80 to 200 ° C., cooling, and then performing anodizing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27058792A JP3173887B2 (en) | 1992-10-08 | 1992-10-08 | Anodizing pretreatment method for Al alloy die casting material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27058792A JP3173887B2 (en) | 1992-10-08 | 1992-10-08 | Anodizing pretreatment method for Al alloy die casting material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06122995A JPH06122995A (en) | 1994-05-06 |
| JP3173887B2 true JP3173887B2 (en) | 2001-06-04 |
Family
ID=17488202
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27058792A Expired - Fee Related JP3173887B2 (en) | 1992-10-08 | 1992-10-08 | Anodizing pretreatment method for Al alloy die casting material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3173887B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014005718A (en) * | 2012-05-31 | 2014-01-16 | Sanwa Shutter Corp | Self-weight drop control system of fireproof and smokeproof shutter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2021113505A (en) * | 2020-01-16 | 2021-08-05 | トヨタ自動車株式会社 | Piston of internal combustion engine and method for manufacturing the same |
-
1992
- 1992-10-08 JP JP27058792A patent/JP3173887B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014005718A (en) * | 2012-05-31 | 2014-01-16 | Sanwa Shutter Corp | Self-weight drop control system of fireproof and smokeproof shutter |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06122995A (en) | 1994-05-06 |
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