JPH03100198A - Manufacture of aluminum alloy piston - Google Patents
Manufacture of aluminum alloy pistonInfo
- Publication number
- JPH03100198A JPH03100198A JP23618289A JP23618289A JPH03100198A JP H03100198 A JPH03100198 A JP H03100198A JP 23618289 A JP23618289 A JP 23618289A JP 23618289 A JP23618289 A JP 23618289A JP H03100198 A JPH03100198 A JP H03100198A
- Authority
- JP
- Japan
- Prior art keywords
- piston body
- treatment
- aluminum alloy
- anodic oxidation
- piston
- 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
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 title claims description 14
- 229910052751 metal Inorganic materials 0.000 claims abstract description 12
- 239000002184 metal Substances 0.000 claims abstract description 12
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 4
- 239000010703 silicon Substances 0.000 claims abstract description 4
- 238000007743 anodising Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 12
- 239000011856 silicon-based particle Substances 0.000 abstract description 7
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 abstract description 6
- 238000005554 pickling Methods 0.000 abstract description 6
- 229910052742 iron Inorganic materials 0.000 abstract description 5
- 230000003647 oxidation Effects 0.000 abstract description 5
- 238000007254 oxidation reaction Methods 0.000 abstract description 5
- 239000011248 coating agent Substances 0.000 abstract description 4
- 238000000576 coating method Methods 0.000 abstract description 4
- 238000009713 electroplating Methods 0.000 abstract description 4
- 229910052759 nickel Inorganic materials 0.000 abstract description 4
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 abstract description 3
- 229910000147 aluminium phosphate Inorganic materials 0.000 abstract description 3
- 229910000040 hydrogen fluoride Inorganic materials 0.000 abstract description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 abstract description 2
- 229910017604 nitric acid Inorganic materials 0.000 abstract description 2
- 238000007747 plating Methods 0.000 description 8
- 239000010949 copper Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 238000002048 anodisation reaction Methods 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- IOUCSUBTZWXKTA-UHFFFAOYSA-N dipotassium;dioxido(oxo)tin Chemical compound [K+].[K+].[O-][Sn]([O-])=O IOUCSUBTZWXKTA-UHFFFAOYSA-N 0.000 description 1
- 229960002089 ferrous chloride Drugs 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2201/00—Metals
- F05C2201/02—Light metals
- F05C2201/021—Aluminium
Landscapes
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、例えば自動車用内燃機関のアルミニウム合金
製ピストンの製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method of manufacturing an aluminum alloy piston for, for example, an internal combustion engine for an automobile.
従来の技術
周知のように、例えば自動車用内燃機関にあっては、車
体重量の軽量化の要請に伴いシリンダブロックやピスト
ン等を、重量の大きい鋳鉄製からアルミニウム合金製に
替えて使用する傾向にあるが、そのシリンダブロック内
のシリンダと該シリンダ内を往復動するピストンとの摩
擦の問題が新だに提起されている。Conventional Technology As is well known, for example, in internal combustion engines for automobiles, there is a trend to replace heavy cast iron cylinder blocks and pistons with aluminum alloy ones due to the desire to reduce vehicle weight. However, the problem of friction between the cylinder within the cylinder block and the piston reciprocating within the cylinder has been raised.
そこで、斯かる摩擦の問題を解決するために、アルミニ
ウム合金製シリンダブロック自体の製造方法の他に、ア
ルミニウム合金製ピストンの製造方法の改良案が従来か
ら種々提案されており、その−例として特公昭５５−４
７１１８号公報等に記載された製造方法が一般に知られ
ている。Therefore, in order to solve this problem of friction, in addition to the method of manufacturing the aluminum alloy cylinder block itself, various improvements have been proposed to the method of manufacturing the aluminum alloy piston. Kosho 55-4
The manufacturing method described in Publication No. 7118 and the like is generally known.
これは、ケイ素９．４重量％以上を含むアルミニウム合
金製のピストン本体の表面に、リン酸を５０〜３００
’ＩＱを含有する浴内において２０〜７０℃の温度範囲
にて極短時間に交流電流のもとで陽極酸化処理を行ない
、次に斯かる陽極酸化された表面上に、鉄、ニッケル、
コバルト及びクロムから成る群から選択された減摩金属
を例えば電解めっきで被覆するようにしたものである。This method involves applying 50 to 300% of phosphoric acid to the surface of an aluminum alloy piston body containing 9.4% by weight or more of silicon.
Anodization is carried out under alternating current for a very short period of time in a bath containing IQ at a temperature range of 20-70°C, and then on the anodized surface iron, nickel,
An antifriction metal selected from the group consisting of cobalt and chromium is coated, for example, by electrolytic plating.
このように、ピストン本体の表面上に減摩金属を電解め
っきする前に陽極酸化処理を行なうことによって良好な
密着性を得るための層を形成することができる。したが
って、従前のような金属電解めっき前処理としての亜鉛
や銅のような中間金属層を施す必要がな（なり、製造工
程の簡素化が図れ、製造作業能率の向上とコストの低廉
化を図ることができる。In this manner, a layer for obtaining good adhesion can be formed by anodizing the surface of the piston body before electrolytically plating the anti-friction metal. Therefore, there is no need to apply an intermediate metal layer such as zinc or copper as a pre-treatment for metal electrolytic plating as in the past (this simplifies the manufacturing process, improves manufacturing efficiency and reduces costs). be able to.
発明が解決しようとする課題
然し乍ら、前記公報記載の従来例にあっては、鋳造され
たアルミニウム合金製のピストン本体を陽極酸化処理す
るようになっているが、ピストン本体の表面に存するケ
イ素粒子は陽極酸化処理が不可能であり、表面上にその
まま残留してしまう。Problems to be Solved by the Invention However, in the conventional example described in the above publication, the cast aluminum alloy piston body is anodized, but the silicon particles present on the surface of the piston body are It cannot be anodized and remains on the surface.
このため、後処理の金属電解めっきの密着性が不十分と
なり、ピストン本体の表面から剥離してしまう虞がある
。For this reason, the adhesion of the post-processed metal electrolytic plating becomes insufficient, and there is a possibility that it may peel off from the surface of the piston body.
課題を解決するための手段
本発明は、前記従来の問題点に鑑みて案出されたもので
、ケイ素を有するピストン本体の表面に、陽極酸化処理
を施した後に、減摩金属を被覆してなるアルミニウム合
金製ピストンの製造方法において、前記陽極酸化処理前
にピストン本体を予め酸洗い処理を行なうようにしたこ
とを特徴とじている。Means for Solving the Problems The present invention was devised in view of the above-mentioned conventional problems, and includes coating the surface of the piston body containing silicon with an anti-friction metal after anodizing the surface. The method for manufacturing an aluminum alloy piston is characterized in that the piston body is previously subjected to pickling treatment before the anodizing treatment.
作用
前記構成の本発明によれば、ピストン本体を予め酸洗い
処理を行なうことにより、ピストン本体表面上のケイ素
粒子を溶解除去することができるため、その後の陽極酸
化処理効果が大きくなる。Effects According to the present invention having the above configuration, silicon particles on the surface of the piston body can be dissolved and removed by pre-pickling the piston body, thereby increasing the effect of the subsequent anodizing treatment.
したがって、その後の減摩金属の被覆処理時における密
着性が十分に向上する。Therefore, the adhesion during the subsequent anti-friction metal coating treatment is sufficiently improved.
実施例
以下、本発明に係るアルミニウム合金製ピストンの製造
方法の一実施例を説明する。EXAMPLE An example of the method for manufacturing an aluminum alloy piston according to the present invention will be described below.
まず、ピストンを製造するために使用されるアルミニウ
ム合金の成分は、前記公報記載のものと同様であって、
Ａ−３ｌ ２ＵＮの成分は、Ｓｉ二１１．５〜１３％、
Ｃｕ ： ０．５〜１．５％、Ｎｉ：０．５〜１．５％
、Ｍｇ＋０．８〜１．５２％であり、他の成分であるＡ
、−３１０ＵＮの成分は、Ｓｉ ： ９．４〜１０．６
％、Ｃｕ ： １．９〜２．６％。First, the ingredients of the aluminum alloy used to manufacture the piston are the same as those described in the above publication,
The components of A-3l 2UN are Si2 11.5-13%,
Cu: 0.5-1.5%, Ni: 0.5-1.5%
, Mg+0.8 to 1.52%, and other components A
, -310UN components are Si: 9.4 to 10.6
%, Cu: 1.9-2.6%.
Ｍｇ ： ０．８〜１．５％、Ａ−５Ｉ８ＵＮＣ；の成
分は、Ｓｉ：１７〜１９％、Ｃｕ ： ０．８〜１．５
％。Mg: 0.8-1.5%, A-5I8UNC; components are Si: 17-19%, Cu: 0.8-1.5
%.
Ｍｇ ： ０．８〜・１．３％、Ｎｉ：二１．３％、Ａ
Ｓ２２ＵＮＫの成分は、Ｓ ｉ’： ２０〜２２％。Mg: 0.8-1.3%, Ni: 1.3%, A
The components of S22UNK are S i': 20-22%.
Ｃｕ：１〜２．２％、Ｍｇ ： ０．８〜１．３％、Ｎ
ｉ： ０．８〜１．６％、Ｃｏ ： ０．８〜１．６％
である。Cu: 1-2.2%, Mg: 0.8-1.3%, N
i: 0.8-1.6%, Co: 0.8-1.6%
It is.
そして、斯かる成分で鋳造されたピストン本体に以下の
処理を行なった。Then, the piston body cast from these ingredients was subjected to the following treatment.
第１工程の脱脂処理として、ピストン本体をアルカリ浴
で５０℃にて１分間浸漬して洗滌した。As the first degreasing treatment, the piston body was washed by immersing it in an alkaline bath at 50° C. for 1 minute.
第２工程の酸洗い処理として、ピストン本体を硝酸を７
５％、フッ化水素を２５％含有する浴内にピストン本体
を３０秒間浸漬した。これによって、ピストン本体の表
面上に存するケイ素Ｓｉ粒子を十分に溶解除去した。As the second pickling process, the piston body is soaked in nitric acid for 70 minutes.
The piston body was immersed for 30 seconds in a bath containing 5% hydrogen fluoride and 25% hydrogen fluoride. As a result, the silicon particles present on the surface of the piston body were sufficiently dissolved and removed.
次に、第３工程の陽極酸化処理として、リン酸を３０％
含有する３０℃の浴内で、４ Ａ／ｄａ’の電流密度の
直流電流で電解処理を行なった。これによって、ピスト
ン本体の表面にアルマイト層が形成される。Next, as the third step of anodizing treatment, phosphoric acid was added to 30%
Electrolytic treatment was carried out in a 30° C. bath containing a direct current with a current density of 4 A/da'. As a result, an alumite layer is formed on the surface of the piston body.
第４工程の電解鉄めっき処理として、鉄粉を２０５ ’
＃、塩化第１鉄を４６５ ”／１２．ホウ酸を３８’Ｉ
Ｑを含有する浴内において、浴のＰＨ０，２，浴温は７
０℃としてめっき作用は１０ Ａ／ｄａ’の電流密度の
もとに６分間行なった。As the fourth step of electrolytic iron plating treatment, 205' of iron powder is applied.
#, ferrous chloride 465”/12. boric acid 38’I
In the bath containing Q, the pH of the bath is 0.2, and the bath temperature is 7.
The plating operation was carried out at 0°C for 6 minutes at a current density of 10 A/da'.
次に、第５工程の電解錫めっき処理として、錫粉４２
’＃！、錫酸カリウム１１０ ’／（２，水酸化カリウ
ム５０ ’＃２を含有する浴内において、浴温７５℃と
してめっき作用は２ Ａ／ｄｇｉ”の電流密度のもとに
３分間行なった。Next, as the fifth step of electrolytic tin plating treatment, tin powder 42
'#! , potassium stannate 110'/(2, potassium hydroxide 50'#2), the bath temperature was 75° C., and the plating operation was carried out for 3 minutes at a current density of 2 A/dgi”.
本発明によりめっきされた処理済製品について行われた
冷熱衝撃試験では、本処理の有効性が明らかになった。Thermal shock tests performed on treated products plated according to the invention revealed the effectiveness of the treatment.
すなわち、冷熱衝撃試験は、処理したピストン本体から
切り出されたｌＯ會１角の試片で行ない、３５０℃で１
５分間加熱後２０℃の水浴で急冷した。That is, the thermal shock test was conducted on a 1-square specimen cut from the treated piston body, and
After heating for 5 minutes, it was rapidly cooled in a 20°C water bath.
斯かる試験結果は次の通りである。The results of this test are as follows.
比較してクラックの発生率が低（なったのは、第２工程
の酸洗い処理によってケイ素粒子が溶解除去されたため
、第３工程の陽極酸化処理の効果が太き（なったからで
ある。つまり、ケイ素粒子の除去によりアルミニウム合
金製ピストン本体の表面全体に均一なアルマイト層（陽
極酸化被膜）が形成されたため、以後の鉄めっきの密着
性が十分に向上したのである。In comparison, the crack occurrence rate was low (because the silicon particles were dissolved and removed by the pickling treatment in the second step, and the effect of the anodic oxidation treatment in the third step became thicker). By removing the silicon particles, a uniform alumite layer (anodized film) was formed on the entire surface of the aluminum alloy piston body, which sufficiently improved the adhesion of subsequent iron plating.
尚、ピストン本体の表面に硬質鉄めっきが施されること
により、該ピストン本体の耐摩特性が向上すると共に、
焼き付きの発生を十分に防止できることは言うまでもな
い。In addition, by applying hard iron plating to the surface of the piston body, the wear resistance of the piston body is improved, and
Needless to say, the occurrence of burn-in can be sufficiently prevented.
発明の効果
以上の説明で明らかなように、本発明に係るアルミニウ
ム合金製ピストン製造方法によれば、陽極酸化処理によ
って製造工程の簡素化が図れることは勿論のこと、該陽
極酸化処理前にピストン本体を予め酸洗い処理し、これ
によって表面上のケイ素粒子を溶解除去するため、次の
陽極酸化処理効果が大きくなる。したがって、硬質鉄め
っきの密着性が向上し、ピストン本体からの剥離が十分
に防止される。Effects of the Invention As is clear from the above explanation, according to the method for manufacturing an aluminum alloy piston according to the present invention, not only can the manufacturing process be simplified by anodizing treatment, but also the piston is The main body is pre-pickled to dissolve and remove silicon particles on the surface, which increases the effect of the subsequent anodizing treatment. Therefore, the adhesion of the hard iron plating is improved, and peeling from the piston body is sufficiently prevented.
Claims (1)
化処理を施した後に、減摩金属を被覆してなるアルミニ
ウム合金製ピストンの製造方法において、前記陽極酸化
処理前にピストン本体を予め酸洗い処理を行なうように
したことを特徴とするアルミニウム合金製ピストンの製
造方法。(1) In a method for manufacturing an aluminum alloy piston in which the surface of a silicon-containing piston body is anodized and then coated with an anti-friction metal, the piston body is pre-pickled before the anodizing treatment. 1. A method for manufacturing an aluminum alloy piston, characterized by performing a treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23618289A JPH03100198A (en) | 1989-09-12 | 1989-09-12 | Manufacture of aluminum alloy piston |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23618289A JPH03100198A (en) | 1989-09-12 | 1989-09-12 | Manufacture of aluminum alloy piston |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03100198A true JPH03100198A (en) | 1991-04-25 |
Family
ID=16996989
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23618289A Pending JPH03100198A (en) | 1989-09-12 | 1989-09-12 | Manufacture of aluminum alloy piston |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03100198A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010223426A (en) * | 2009-02-27 | 2010-10-07 | Hitachi Automotive Systems Ltd | Disc brake and sliding member |
| EP4060095A1 (en) * | 2021-03-18 | 2022-09-21 | Suzuki Motor Corporation | Piston for internal combustion engine and method for manufacturing the same |
-
1989
- 1989-09-12 JP JP23618289A patent/JPH03100198A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010223426A (en) * | 2009-02-27 | 2010-10-07 | Hitachi Automotive Systems Ltd | Disc brake and sliding member |
| US8459421B2 (en) | 2009-02-27 | 2013-06-11 | Hitachi Automotive Systems, Ltd. | Disk brake and sliding member |
| EP4060095A1 (en) * | 2021-03-18 | 2022-09-21 | Suzuki Motor Corporation | Piston for internal combustion engine and method for manufacturing the same |
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