JP7318281B2 - Aluminum alloys for compressor sliding parts and forgings for compressor sliding parts - Google Patents
Aluminum alloys for compressor sliding parts and forgings for compressor sliding parts Download PDFInfo
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Description
本発明は、自動車エアコン用コンプレッサー（圧縮機）に代表される摺動部品、とりわけスクロールおよび電動スクロールに好適に使用できるアルミニウム合金に関する。 TECHNICAL FIELD The present invention relates to an aluminum alloy that can be suitably used for sliding parts typified by automobile air conditioner compressors, particularly scrolls and electric scrolls.
近年の自動車業界における燃費向上の要求から、自動車に使用される各種部材、例えばカーエアコン用のコンプレッサーには軽量化、高機能化の要求が高まってきている。カーエアコン用コンプレッサーには種々の形式が存在するが、上述の背景に伴い小型コンプレッサーとしてスクロール型が普及している。このような部材については、鉄鋼材料や鋳鉄材料に代えて、重量に対する強度の比である比強度の大きいアルミニウム合金が使用されてきている。特に上記カーエアコン用コンプレッサーに代表されるような、高温雰囲気下の過酷な環境でも使用し得る高温下高強度を有し、且つ摺動時の耐摩耗性に優れたＡｌ－Ｓｉ系合金等のアルミニウム合金からなる鍛造材が注目されている。 Due to the recent demand for improved fuel efficiency in the automobile industry, there is an increasing demand for lighter weight and higher functionality for various parts used in automobiles, such as compressors for car air conditioners. There are various types of compressors for car air conditioners, but scroll type compressors are widely used as compact compressors in view of the background described above. For such members, instead of steel materials and cast iron materials, aluminum alloys, which have a high strength-to-weight ratio, have been used. In particular, Al-Si alloys, etc., which have high strength under high temperatures and can be used in harsh environments under high temperature atmospheres, such as those represented by the compressors for car air conditioners, and have excellent wear resistance during sliding. Forgings made of aluminum alloys are attracting attention.
この種のアルミニウム合金鍛造材を製造するに際しては、例えば特許文献１に記載されているように、所定の金属組成のアルミニウム合金を金型鋳造にて成形し、所定の熱処理を施すことによってカーエアコン用スクロールを製造することが行われている。 When manufacturing this type of aluminum alloy forging, for example, as described in Patent Document 1, an aluminum alloy having a predetermined metal composition is formed by die casting and subjected to a predetermined heat treatment to form a car air conditioner. It has been practiced to manufacture scrolls for
ところで、上記のようなアルミニウム合金を用いてスクロールを製造する際、表面に表面処理、とりわけアルマイト処理を施すが、Ｓｉ粒子によりアルマイト皮膜表面の摩擦係数が大きくなるという問題があった。 By the way, when manufacturing a scroll using an aluminum alloy as described above, the surface is surface-treated, especially anodized, but there is a problem that Si particles increase the coefficient of friction of the alumite film surface.
また、アルマイト皮膜表面の摩擦係数を低減するべく、Ｓｉ添加量を抑制することも有効ではあるが、その場合、引張強さが低下するという問題がある。 It is also effective to suppress the amount of Si added in order to reduce the friction coefficient of the alumite film surface, but in that case, there is a problem that the tensile strength is lowered.
本発明は、かかる技術的背景に鑑みてなされたものであって、引張強さを十分に確保できると共に、低摩擦係数のアルマイト皮膜が形成されるコンプレッサー摺動部品用アルミニウム合金およびコンプレッサー摺動部品鍛造品を提供することを目的とする。 The present invention has been made in view of the above technical background, and an aluminum alloy for compressor sliding parts that can sufficiently ensure tensile strength and forms an anodized film with a low coefficient of friction, and a compressor sliding part. The purpose is to provide forgings.
前記目的を達成するために、本発明者は鋭意研究の結果、アルミニウム合金においてＳｉ、Ｃｕ、Ｍｇをそれぞれ特定の含有率範囲に制御することにより、引張強さを十分に確保できると共に、低摩擦係数のアルマイト皮膜が形成されることを見出すに至り、本発明を完成したものである。即ち、本発明は以下の手段を提供する。 In order to achieve the above object, the present inventors have made intensive studies and found that by controlling Si, Cu, and Mg in aluminum alloys to specific content ranges, it is possible to ensure sufficient tensile strength and low friction. The inventors have found that an alumite film with a coefficient is formed, and have completed the present invention. That is, the present invention provides the following means.
［１］Ｓｉ：２．０質量％～４．０質量％、Ｃｕ：１．５質量％～３．５質量％、Ｍｇ：０．１質量％～０．８質量％を含有し、残部がＡｌ及び不可避不純物からなるアルミニウム合金であって、
前記アルミニウム合金材料の引張強さが３６０ＭＰａ～４５０ＭＰａであることを特徴とするコンプレッサー摺動部品用アルミニウム合金。
[1] Si: 2.0% by mass to 4.0% by mass, Cu: 1.5% by mass to 3.5% by mass, Mg: 0.1% by mass to 0.8% by mass, and the balance is An aluminum alloy composed of Al and inevitable impurities,
An aluminum alloy for compressor sliding parts, wherein the aluminum alloy material has a tensile strength of 360 MPa to 450 MPa.
［２］前記アルミニウム合金は、さらにＴｉ：０．００１質量％～０．１質量％を含有する前項１に記載のコンプレッサー摺動部品用アルミニウム合金。 [2] The aluminum alloy for compressor sliding parts according to the preceding item 1, wherein the aluminum alloy further contains Ti: 0.001% by mass to 0.1% by mass.
［３］前項１または２に記載のコンプレッサー摺動部品用アルミニウム合金で構成されたコンプレッサー摺動部品鍛造品。 [3] A forged compressor sliding part made of the aluminum alloy for a compressor sliding part according to 1 or 2 above.
［４］前項１または２に記載のコンプレッサー摺動部品用アルミニウム合金で構成されたコンプレッサー摺動部品鍛造品の表面に、アルマイト皮膜が形成されてなるコンプレッサー摺動部品。 [4] Compressor sliding parts obtained by forming an alumite film on the surface of a compressor sliding part forged made of the aluminum alloy for compressor sliding parts according to the above item 1 or 2.
［５］前記アルマイト皮膜の表面の摩擦係数が１．００以下である前項４に記載のコンプレッサー摺動部品。 [5] The compressor sliding part according to the preceding item 4, wherein the coefficient of friction of the surface of the alumite film is 1.00 or less.
［１］の発明では、引張強さを十分に確保できると共に、アルマイト皮膜表面の摩擦係数を抑制できるコンプレッサー摺動部品用アルミニウム合金を提供できる。 In the invention [1], it is possible to provide an aluminum alloy for compressor sliding parts that can sufficiently ensure tensile strength and suppress the coefficient of friction of the surface of the alumite film.
［２］の発明では、Ｔｉを特定含有率で含有するので、鋳造品の結晶粒微細化に寄与できる。 In the invention [2], since Ti is contained at a specific content rate, it can contribute to refinement of crystal grains of cast products.
［３］の発明では、引張強さを十分に確保できると共に、アルマイト皮膜表面の摩擦係数を抑制できるコンプレッサー摺動部品鍛造品を提供できる。 In the invention [3], it is possible to provide a compressor sliding part forged product that can sufficiently ensure tensile strength and suppress the friction coefficient of the alumite film surface.
［４］及び［５］の発明では、引張強さを十分に確保できると共に、低摩擦係数のアルマイト皮膜が形成されたコンプレッサー摺動部品を提供できる。 In the inventions [4] and [5], it is possible to provide a sliding part for a compressor having sufficient tensile strength and an alumite film having a low coefficient of friction.
本発明に係るコンプレッサー摺動部品用アルミニウム合金は、Ｓｉ：２．０質量％～４．０質量％、Ｃｕ：１．５質量％～３．５質量％、Ｍｇ：０．１質量％～０．８質量％を含有し、残部がＡｌ及び不可避不純物からなるアルミニウム合金であって、前記アルミニウム合金材料の引張強さが３６０ＭＰａ～４５０ＭＰａであることを特徴とする。このような構成とすることで、引張強さを十分に確保できると共に、アルマイト皮膜表面の摩擦係数を抑制できるコンプレッサー摺動部品用アルミニウム合金を提供できる。 The aluminum alloy for compressor sliding parts according to the present invention contains Si: 2.0% by mass to 4.0% by mass, Cu: 1.5% by mass to 3.5% by mass, Mg: 0.1% by mass to 0 .8% by mass, the balance being Al and unavoidable impurities, wherein the aluminum alloy material has a tensile strength of 360 MPa to 450 MPa. With such a configuration, it is possible to provide an aluminum alloy for compressor sliding parts that can sufficiently ensure tensile strength and suppress the coefficient of friction of the surface of the alumite film.
次に、上述した本発明に係るコンプレッサー摺動部品用アルミニウム合金における「アルミニウム合金」の組成について以下詳述する。前記アルミニウム合金は、Ｓｉ：２．０質量％～４．０質量％、Ｃｕ：１．５質量％～３．５質量％、Ｍｇ：０．１質量％～０．８質量％を含有し、残部がＡｌ及び不可避不純物からなるアルミニウム合金である。 Next, the composition of the "aluminum alloy" in the above-described aluminum alloy for compressor sliding parts according to the present invention will be described in detail below. The aluminum alloy contains Si: 2.0 mass% to 4.0 mass%, Cu: 1.5 mass% to 3.5 mass%, Mg: 0.1 mass% to 0.8 mass%, The balance is an aluminum alloy composed of Al and unavoidable impurities.
前記Ｓｉ（成分）は、高温強度を向上させる作用を有するが、共晶Ｓｉ粒子がアルマイト表面の摩擦の主要因子になっており、摩擦係数を増大させる原因元素でもある。Ｓｉが２．０質量％未満では、十分な高温強度が得られなくなる。一方、Ｓｉが４．０質量％を超えると、アルマイト表面において低摩擦係数を得ることができない。従って、Ｓｉ含有率は、２．０質量％～４．０質量％に設定する。中でも、Ｓｉ含有率は、２．５質量％～３．５質量％に設定するのが好ましい。 The Si (component) has the effect of improving the high-temperature strength, but the eutectic Si particles are the main factor of friction on the alumite surface, and are also the causative element that increases the coefficient of friction. If the Si content is less than 2.0% by mass, sufficient high-temperature strength cannot be obtained. On the other hand, when Si exceeds 4.0% by mass, a low coefficient of friction cannot be obtained on the alumite surface. Therefore, the Si content is set to 2.0% by mass to 4.0% by mass. Above all, it is preferable to set the Si content to 2.5% by mass to 3.5% by mass.
前記Ｃｕ（成分）は、Ｓｉと同様に高温強度を向上させる作用を有する。しかし、その反面、アルマイト光沢ムラの原因元素でもある。高温強度を向上させる作用はＣｕの析出によるものであり、人工時効処理を施すことによって上記効果が得られるが、ＣｕＡｌ2のθ相がアルマイト表面の摩擦係数を増大させる。Ｃｕが１．５質量％未満では、十分な析出強化が得られず、強度を向上できない。一方、Ｃｕが３．５質量％を超えると、アルマイト表面の摩擦係数が増大する。従って、Ｃｕ含有率は、１．５質量％～３．５質量％に設定する。中でも、Ｃｕ含有率は、２．１質量％～２．９質量％に設定するのが好ましい。 The Cu (component) has the effect of improving the high-temperature strength in the same manner as Si. However, on the other hand, it is also a causative element of anodized aluminum gloss unevenness. The effect of improving the high-temperature strength is due to the precipitation of Cu, and the above effect can be obtained by applying artificial aging treatment, but the θ phase of CuAl 2 increases the friction coefficient of the alumite surface. If the Cu content is less than 1.5% by mass, sufficient precipitation strengthening cannot be obtained and the strength cannot be improved. On the other hand, when Cu exceeds 3.5% by mass, the friction coefficient of the alumite surface increases. Therefore, the Cu content is set to 1.5% by mass to 3.5% by mass. Above all, it is preferable to set the Cu content to 2.1% by mass to 2.9% by mass.
前記Ｍｇ（成分）は、Ｃｕと同様に高温強度を向上させる作用を有する。Ｍｇは鋳造時に固溶し、人工時効処理時にＳｉやＣｕと化合物を形成して析出することで、高温における強度向上に寄与する。このような効果は、Ｍｇ含有率が０．１質量％以上で顕著に表れ、Ｍｇ含有率が０．８質量％を超えると上記効果が顕著に表れなくなる。従って、Ｍｇ含有率は、０．１質量％～０．８質量％に設定する。中でも、Ｍｇ含有率は、０．４質量％～０．７質量％に設定するのが好ましい。 The Mg (component) has the effect of improving the high-temperature strength like Cu. Mg forms a solid solution during casting, forms a compound with Si and Cu during artificial aging treatment, and precipitates, thereby contributing to strength improvement at high temperatures. Such an effect appears remarkably when the Mg content is 0.1% by mass or more, and when the Mg content exceeds 0.8% by mass, the above effect does not appear remarkably. Therefore, the Mg content is set to 0.1% by mass to 0.8% by mass. Above all, it is preferable to set the Mg content to 0.4% by mass to 0.7% by mass.
前記アルミニウム合金は、さらにＴｉ：０．００１質量％～０．１質量％を含有するのが好ましい。Ｔｉは、微細添加することで鋳造品の結晶粒微細化に寄与する。この効果は、Ｔｉ含有率が０．００１質量％以上になると顕著に表れるが、０．１質量％を超えると、Ｔｉを含む化合物が粗大に晶出して、延性低下をもたらす。従って、Ｔｉは、０．００１質量％～０．１質量％含有せしめるのが好ましい。中でも、Ｔｉは、０．０１質量％～０．０８質量％含有せしめるのがより好ましい。 The aluminum alloy preferably further contains Ti: 0.001 mass % to 0.1 mass %. Fine addition of Ti contributes to grain refinement of the cast product. This effect is remarkable when the Ti content is 0.001% by mass or more, but when it exceeds 0.1% by mass, the Ti-containing compound crystallizes coarsely, resulting in a decrease in ductility. Therefore, Ti is preferably contained in an amount of 0.001% by mass to 0.1% by mass. Among them, Ti is more preferably contained in an amount of 0.01% by mass to 0.08% by mass.
その他の金属元素として、Ｚｎ、Ｆｅ、Ｎｉ、Ｍｎ、Ｃｒ、Ｃｏ、Ｖ、Ｍｏ、Ｚｒ、Ｓｃ、Ｈｆ、Ｃｅ、Ｎｂ、Ｅｒ、Ｙｂは、不可避不純物として、これらの合計量で最大０．５質量％まで許容できる。０．５質量％を超えると、Ａｌ母相より先に晶出されて粗大晶出物となり、延性低下をもたらす。 As other metal elements, Zn, Fe, Ni, Mn, Cr, Co, V, Mo, Zr, Sc, Hf, Ce, Nb, Er, and Yb are added as unavoidable impurities, and the maximum total amount of these is 0.5 up to % by weight is permissible. If it exceeds 0.5% by mass, it is crystallized before the Al matrix phase to form coarse crystallized substances, resulting in a decrease in ductility.
上述した組成のアルミニウム合金を例えば周知の方法で溶製することによって上記合金組成の連続鋳造材（ビレット）を製作し、その連続鋳造材に熱処理を行い、さらに鍛造加工等の塑性加工を行った後、切削加工等を行うことによって、コンプレッサー摺動部品を得ることができる（図３参照）。なお、図３に示すものは、カーエアコン用スクロールであり、５２は底板、５１は渦巻き状の羽根部である。 A continuously cast material (billet) having the above alloy composition is produced by melting the aluminum alloy having the above composition by, for example, a well-known method, and the continuously cast material is subjected to heat treatment and plastic working such as forging. After that, a compressor sliding part can be obtained by cutting or the like (see FIG. 3). In addition, what is shown in FIG. 3 is a scroll for a car air conditioner, 52 is a bottom plate, and 51 is a spiral blade portion.
次に、本発明の一態様であるカーエアコン用摺動部品の製造方法の一例について説明する。 Next, an example of a method for manufacturing a sliding component for a car air conditioner, which is one aspect of the present invention, will be described.
まず上述したように成分調整されたアルミニウム合金溶湯を連続鋳造する。電動スクロールの製造を想定した場合、例えば直径６０ｍｍ～８０ｍｍ程度の寸法で鋳造する。押出を用いて上記直径の鍛造用ビレットを得ることもできるが、製造コストが高価になるので、鋳造加工により鍛造用ビレットを得るのが好ましい。 First, the molten aluminum alloy whose composition is adjusted as described above is continuously cast. Assuming the manufacture of an electric scroll, for example, it is cast with a diameter of about 60 mm to 80 mm. Although it is possible to obtain a forging billet with the above diameter using extrusion, it is preferable to obtain a forging billet by casting because the manufacturing cost is high.
得られた鋳造材は、鋳造時に晶出物の偏析等が起きているため、均質化熱処理を施すが、この均質化熱処理では加熱温度を４６０℃～５１０℃に設定し、処理時間を０．５時間～６時間に設定するのが好ましい。 Since the obtained cast material has segregation of crystallized substances during casting, it is subjected to a homogenization heat treatment. It is preferable to set it to 5 hours to 6 hours.
次に、鋳造材を所定の長さに切断し、鍛造用ビレットを得る。鍛造工程では、金型温度を１００℃～３００℃とし、素材温度を３７０℃～５１０℃に設定するのが好ましい。 Next, the cast material is cut to a predetermined length to obtain a billet for forging. In the forging process, it is preferable to set the die temperature to 100°C to 300°C and the material temperature to 370°C to 510°C.
次いで、前記鍛造用ビレットに溶体化処理を行う。この溶体化処理では、加熱の温度を４５０℃～５１０℃に設定し、処理時間を０．５時間～８．０時間に設定するのが好ましい。 Then, the forging billet is subjected to solution treatment. In this solution treatment, it is preferable to set the heating temperature to 450° C. to 510° C. and set the treatment time to 0.5 hour to 8.0 hours.
次に、焼入れ処理を行う。この焼入れ処理は、１０℃～８０℃の水で急冷するのが好ましい。 Next, a quenching process is performed. This quenching treatment is preferably quenched with water at 10°C to 80°C.
次いで、人工時効処理を行う。この人工時効処理は、加熱処理温度を１６０℃～２２０℃とし、加熱処理時間を１時間～１８時間に設定するのが好ましい。 Then, artificial aging treatment is performed. This artificial aging treatment is preferably carried out at a heat treatment temperature of 160° C. to 220° C. and a heat treatment time of 1 hour to 18 hours.
次に、人工時効処理を施した鍛造品を機械加工にて切削した後、ピーニングし表面近傍に塑性加工を加えて疲労強度を向上させる。このショットピーニング工程では、砥粒サイズは１ｍｍ以下とし、砥粒種はＳＵＳ３０４、アルミナ等を用い、ピーニング圧力は１ＭＰａ以下とするのが好ましい。 Next, the artificially aged forged product is cut by machining, peened, and plastic working is applied to the vicinity of the surface to improve the fatigue strength. In this shot peening process, it is preferable that the abrasive grain size is 1 mm or less, the abrasive grain type is SUS304, alumina, or the like, and the peening pressure is 1 MPa or less.
以上のようにして製造された本発明に係るコンプレッサー摺動部品鍛造品は、常温強度、高温強度に優れており、とりわけ摺動部品として必要な摺動性を確保するためのアルマイト性に優れる（アルマイト皮膜の光沢均一性に優れる）ので、カーエアコン用として好適である。 The compressor sliding part forged product according to the present invention manufactured as described above has excellent room temperature strength and high temperature strength, and in particular has excellent alumite properties to ensure the slidability necessary for sliding parts ( The alumite film has excellent gloss uniformity), so it is suitable for car air conditioners.
次に、本発明の具体的実施例について説明するが、本発明はこれら実施例のものに特に限定されるものではない。 Next, specific examples of the present invention will be described, but the present invention is not particularly limited to these examples.
＜実施例１～６、比較例１～８＞
表１に示す合金組成（不可避不純物を含む）に調製したアルミニウム合金溶湯を、連続鋳造にて鋳造して直径８２ｍｍの鋳造材１０を得た（図１参照）。鋳造時の冷却速度は１５℃／秒とした。得られた鋳造材に対し４７０℃で７時間の均質化熱処理を行った後、空冷した。前記鋳造材を長さ３０ｍｍに切断した後、素材温度４２０℃、金型温度１８０℃で鍛造した。鍛造においては、スクロール鍛造品の底板５２を想定し鋳造材の軸方向と平行な方向に８０％の据え込みを行って鍛造材２０を得た（図２参照）。次に、前記鍛造材に４９５℃で３時間加熱して溶体化処理を行った後、２５℃の水にて水焼入れ処理を行った。次いで、加熱処理温度１８０℃で８時間加熱する人工時効処理を行って、Ｔ６鍛造品を得た。
<Examples 1 to 6, Comparative Examples 1 to 8>
A molten aluminum alloy having an alloy composition (including unavoidable impurities) shown in Table 1 was cast by continuous casting to obtain a
上記のようにして得られたＴ６鍛造品について下記評価法に基づいて評価した。これら評価結果を表１に示す。 The T6 forged product obtained as described above was evaluated based on the following evaluation methods. These evaluation results are shown in Table 1.
＜組織観察による結晶粒径の測定法＞
鍛造品の中心部から１ｃｍ×１ｃｍ×高さ１ｃｍのサイズの角材を切り出した後、樹脂埋めを行い、エメリー紙による研磨およびバフ研磨を実施して鏡面仕上げを施した後、鋳造軸に平行な断面の組織を観察した。観察には光学顕微鏡Ｎｉｋｏｎ ＥＰＩＰＨＯＴ ３００を用いて、対物レンズ×１０、×２０、×４０でそれぞれ順光組織観察を行った。偏光組織観察を行う際は、上記鏡面仕上げを施したサンプルを、ホウフッ化水素酸を濃度１．８質量％に希釈した水溶液に３分間浸漬し（浸食させ）、同時に水溶液中に２０Ｖの電圧をかけることで腐食させた。腐食させたサンプルを光学顕微鏡Ｎｉｋｏｎ ＥＰＩＰＨＯＴ ３００を用いて、対物レンズ×２、×５、×１０でそれぞれ偏光組織観察を行った。このような組織観察から得られた組織図より、水平方向等分径（Ｍａｔｉｎ Ｄｉａｍｅｔｅｒ Ｈ）を用いて結晶粒径を測定した。
<Method for measuring grain size by observation of structure>
After cutting out a square bar of 1 cm x 1 cm x 1 cm in height from the center of the forged product, it was filled with resin, polished with emery paper and buffed to a mirror finish, and then parallel to the casting axis. The structure of the cross section was observed. For observation, an optical microscope Nikon EPIPHOT 300 was used, and front-light structure observation was performed with objective lenses of ×10, ×20, and ×40. When observing the polarized structure, the mirror-finished sample is immersed (eroded) for 3 minutes in an aqueous solution in which hydrofluoroboric acid is diluted to a concentration of 1.8% by mass, and at the same time, a voltage of 20 V is applied to the aqueous solution. It was corroded by putting it on. Polarized texture observation of the corroded samples was performed using an optical microscope Nikon EPIPHOT 300 with objective lenses ×2, ×5 and ×10. From the structure chart obtained from such structure observation, the grain size was measured using a horizontal equal division diameter (Matin Diameter H).
＜引張強度測定法＞
鍛造品から切り出し加工を行い、ＪＩＳ Ｚ２２４１に規定の４号引張試験片を得た。前記４号引張試験片に対しＪＩＳ Ｚ２２４１の規定に準拠して引張試験を実施し、引張強度を測定した。表では、引張強度が３６０ＭＰａ以上であるものを「○」（合格）とし、引張強度が３６０ＭＰａ未満であるものを「×」（不合格）と表記した。
<Tensile strength measurement method>
The forged product was cut out to obtain a No. 4 tensile test piece specified in JIS Z2241. The No. 4 tensile test piece was subjected to a tensile test according to JIS Z2241 to measure the tensile strength. In the table, those having a tensile strength of 360 MPa or more are indicated as "◯" (accepted), and those having a tensile strength of less than 360 MPa are indicated as "×" (failed).
＜摩擦係数評価法＞
鍛造品を長さ２０ｍｍに切断し、端面を施盤にて鏡面仕上げを行った後、アルマイト処理を施した。アルマイト処理条件は、電解液：遊離硫酸（濃度１５０ｇ／Ｌ）、電流密度：３Ａ／ｄｍ2、浴温：５℃、処理時間：ソフト３分、電解時間：２１分とした。アルマイト処理後のアルマイト皮膜表面の摩擦係数を測定した。摩擦係数測定には摩擦摩耗試験機（Ｂｒｕｋｅｒ ＵＭＴ ＴｒｉｂｏＬａｂ）を用いて、５ｍｍ・５Ｈｚの往復摺動、相手材を直径６ｍｍのＳＵＪ２球、無潤滑、荷重１Ｎの条件で、摩擦係数測定を実施し、試験開始からの時間で４００秒～６００秒後の摩擦係数の平均値（ｎ数：３個）を求め、これを摩擦係数とした。表では、摩擦係数が１．００以下であるものを「○」（合格）とし、摩擦係数が１．００を超えるものを「×」（不合格）と表記した。
<Friction coefficient evaluation method>
The forged product was cut to a length of 20 mm, and the end face was mirror-finished with a lathe and then alumite-treated. The alumite treatment conditions were electrolyte: free sulfuric acid (concentration: 150 g/L), current density: 3 A/dm 2 , bath temperature: 5° C., treatment time: soft 3 minutes, electrolysis time: 21 minutes. The coefficient of friction of the surface of the alumite film was measured after the alumite treatment. Friction coefficient measurement was performed using a friction wear tester (Bruker UMT TriboLab) under the conditions of reciprocating sliding at 5 mm and 5 Hz, SUJ 2 balls with a diameter of 6 mm as the mating material, no lubrication, and a load of 1 N. After 400 seconds to 600 seconds from the start of the test, the average friction coefficient (n number: 3) was obtained and used as the friction coefficient. In the table, those with a coefficient of friction of 1.00 or less are marked with "◯" (accepted), and those with a coefficient of friction exceeding 1.00 are marked with "×" (failed).
表から明らかなように、本発明に係る実施例１～６のアルミニウム合金を用いた鍛造品は、優れた引張強度を有すると共に、結晶粒径が細かく、低摩擦係数のアルマイト皮膜が形成されることがわかる。 As is clear from the table, the forged products using the aluminum alloys of Examples 1 to 6 according to the present invention have excellent tensile strength, have a fine crystal grain size, and form an alumite film with a low coefficient of friction. I understand.
これに対し、本発明の規定範囲を逸脱する比較例１、４、６、８では、引張強度が不十分であったし、比較例２、３、５、７、８では、アルマイト皮膜の摩擦係数が大きいという問題があった。 On the other hand, in Comparative Examples 1, 4, 6, and 8, which deviate from the specified range of the present invention, the tensile strength was insufficient, and in Comparative Examples 2, 3, 5, 7, and 8, the friction of the alumite film There was a problem that the coefficient was large.
本発明に係るコンプレッサー摺動部品用アルミニウム合金で構成されたコンプレッサー摺動部品は、自動車エアコン用コンプレッサー（圧縮機）に代表される摺動部品、とりわけスクロール、電動スクロールとして好適に使用できる。 Compressor sliding parts made of the aluminum alloy for compressor sliding parts according to the present invention can be suitably used as sliding parts typified by automotive air conditioner compressors, especially scrolls and electric scrolls.
１０…鋳造材
２０…鍛造材
５０…コンプレッサー摺動部品鍛造品
DESCRIPTION OF
Claims (5)
前記アルミニウム合金材料の引張強さが３６０ＭＰａ～４５０ＭＰａであることを特徴とするコンプレッサー摺動部品用アルミニウム合金。 Si: 2.0% by mass to 4.0% by mass, Cu: 1.5% by mass to 3.5% by mass, Mg: 0.1% by mass to 0.8% by mass, the balance being Al and unavoidable An aluminum alloy containing impurities,
An aluminum alloy for compressor sliding parts, wherein the aluminum alloy material has a tensile strength of 360 MPa to 450 MPa.
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