JP2012097309A - Magnesium alloy member, compressor for air conditioner, and method for manufacturing magnesium alloy member - Google Patents
Magnesium alloy member, compressor for air conditioner, and method for manufacturing magnesium alloy member Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
- C22C23/02—Alloys based on magnesium with aluminium as the next major constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/002—Extruding materials of special alloys so far as the composition of the alloy requires or permits special extruding methods of sequences
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
- B21J1/02—Preliminary treatment of metal stock without particular shaping, e.g. salvaging segregated zones, forging or pressing in the rough
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/0005—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 adaptations of pistons
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/121—Casings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/122—Cylinder block
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- 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
- F05C2201/028—Magnesium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Organic Chemistry (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Compressor (AREA)
- Extrusion Of Metal (AREA)
- Forging (AREA)
Abstract
Description
本発明は、アルミニウム、カルシウム、マンガンを含有するマグネシウム合金部材、当該マグネシウム合金部材を機構部品に使用したエアコン用圧縮機、及び、前記マグネシウム合金部材の製造方法に関する。 The present invention relates to a magnesium alloy member containing aluminum, calcium and manganese, a compressor for an air conditioner using the magnesium alloy member as a mechanical component, and a method for producing the magnesium alloy member.
自動車部品において、軽量化のために、低比重であるマグネシウム合金を用いる場合があり、従来、マグネシウム合金の適用部品は、高強度や耐熱性が要求されないケーシングやカバーなどの部品が主であったが、強度や耐熱性を向上させたマグネシウム合金が開発されている。
例えば、特許文献１〜３には、鋳造性及び耐熱性を向上させたマグネシウム合金が開示され、特許文献４には、高温での強度及び鍛造性を向上させたマグネシウム合金が開示されている。
In order to reduce the weight of automobile parts, magnesium alloys with low specific gravity may be used. Conventionally, magnesium alloy parts have been mainly casings and covers that do not require high strength and heat resistance. However, magnesium alloys with improved strength and heat resistance have been developed.
For example, Patent Documents 1 to 3 disclose a magnesium alloy with improved castability and heat resistance, and Patent Document 4 discloses a magnesium alloy with improved strength and forgeability at high temperatures.
ところで、自動車部品の中でも、自動車エアコン用圧縮機は、エンジン近傍に設置され、暴露温度が１００〜１５０℃程度になるため、圧縮機の部品素材には耐熱性が求められ、更に、圧縮機における圧縮を担う機構部品では、高温での高い疲労強度が求められる。
しかし、特許文献１〜３に開示されるマグネシウム合金は鋳造用であるため、機械的強度が不十分であり、圧縮機のような高温での高強度が要求される部品には適用できないという問題があった。
By the way, among automotive parts, a compressor for an automotive air conditioner is installed in the vicinity of the engine, and the exposure temperature is about 100 to 150 ° C. Therefore, heat resistance is required for the component material of the compressor. A mechanical component responsible for compression is required to have high fatigue strength at high temperatures.
However, since the magnesium alloys disclosed in Patent Documents 1 to 3 are for casting, the mechanical strength is insufficient, and the problem that the magnesium alloy cannot be applied to a component requiring high strength at a high temperature such as a compressor. was there.
また、特許文献４，５に開示されるマグネシウム合金は、強度及び鍛造性に優れているとしても、高温疲労強度に関する検証がなく、圧縮機の機構部品への適用可能性が不確かであった。
更に、マグネシウム合金に高価な希少金属を添加すれば、マグネシウム合金の強度を上げることができるが、この場合、コスト高となってしまい、圧縮機の機構部品の素材としては不向きである。
そこで、本発明は、自動車エアコン用圧縮機の機構部品に適用可能な機械的強度及び高温での疲労強度を出現できる、マグネシウム合金部材及びマグネシウム合金部材の製造方法を提供し、更に、必要な機械的強度及び高温での疲労強度を備えたマグネシウム合金製の機構部品を備えたエアコン用圧縮機を提供することを目的とする。
Moreover, even if the magnesium alloys disclosed in Patent Documents 4 and 5 are excellent in strength and forgeability, there is no verification regarding high-temperature fatigue strength, and applicability to mechanical parts of compressors is uncertain.
Furthermore, if an expensive rare metal is added to the magnesium alloy, the strength of the magnesium alloy can be increased. However, in this case, the cost is increased, and it is not suitable as a material for mechanical parts of the compressor.
Accordingly, the present invention provides a magnesium alloy member and a method for manufacturing the magnesium alloy member that can exhibit mechanical strength applicable to mechanical parts of a compressor for an automotive air conditioner and fatigue strength at high temperature, and further, a necessary machine An object of the present invention is to provide a compressor for an air conditioner including a mechanical component made of a magnesium alloy having a mechanical strength and fatigue strength at a high temperature.
上記目的を達成するために、本発明は、質量％で、カルシウムを０．３〜１０％、アルミニウムを０．２〜１５％、マンガンを０．０５〜１．５％含有し、カルシウム／アルミニウムの質量比が０．６〜１．７であり、残部がマグネシウム及び不可避不純物からなるマグネシウム合金の鋳造素材を、２５０〜５００℃で塑性加工することを特徴とする。 In order to achieve the above object, the present invention contains, by mass%, 0.3 to 10% calcium, 0.2 to 15% aluminum, 0.05 to 1.5% manganese, and calcium / aluminum. The mass ratio is 0.6 to 1.7, and a cast material of a magnesium alloy consisting of magnesium and inevitable impurities is plastically processed at 250 to 500 ° C.
カルシウムＣａとアルミニウムＡｌとの双方を添加することで、Ｍｇ‐Ｃａ系化合物と、Ｍｇ‐Ａｌ‐Ｃａ系化合物が粒界に晶出し、室温での機械的強度及び耐熱性が向上する。
これらの晶出物は、Ｃａ／Ａｌの質量比が変わることで変化し、特に、Ｃａ／Ａｌの質量比を０．６〜１．７とした場合、Ｍｇ‐Ｃａ系化合物であるＭｇ2Ｃａと、Ｍｇ‐Ａｌ‐Ｃａ系化合物である（Ｍｇ，Ａｌ）2Ｃａとが同時に晶出し、機械的強度と耐熱性の向上に大きな効果がある。
By adding both calcium Ca and aluminum Al, the Mg—Ca compound and the Mg—Al—Ca compound crystallize at the grain boundary, and the mechanical strength and heat resistance at room temperature are improved.
These crystallized substances change when the mass ratio of Ca / Al is changed. In particular, when the mass ratio of Ca / Al is 0.6 to 1.7, Mg 2 Ca which is an Mg—Ca compound is used. And (Mg, Al) 2 Ca, which is an Mg—Al—Ca-based compound, crystallize at the same time, which has a great effect on improving mechanical strength and heat resistance.
一方、Ｃａ／Ａｌの質量比が１．７よりも大きくなると、Ｍｇ2Ｃａのみ、若しくは、僅かな（Ｍｇ，Ａｌ）2Ｃａが晶出する程度で、機械的強度の向上効果は期待できず、Ｃａ／Ａｌの質量比が０．６よりも小さくなると、Ｍｇ‐Ａｌ系化合物であるβ‐Ｍｇ17Ａｌ12が晶出し、耐熱性に悪影響を及ぼす。
また、マンガンＭｎを少量添加することで、結晶粒径が微細化し、機械的強度が向上する。マンガンＭｎの添加量は、０．０５〜１．５％の範囲が適切であり、この範囲を外れると、結晶粒径の微細化の効果が低くなって、機械的強度の向上効果は期待できない。
On the other hand, when the Ca / Al mass ratio is larger than 1.7, only Mg 2 Ca or a slight amount of (Mg, Al) 2 Ca is crystallized, and the improvement effect of mechanical strength cannot be expected. When the Ca / Al mass ratio is smaller than 0.6, β-Mg 17 Al 12 , which is an Mg—Al compound, crystallizes and adversely affects heat resistance.
Further, by adding a small amount of manganese Mn, the crystal grain size is refined and the mechanical strength is improved. The amount of manganese Mn added is suitably in the range of 0.05 to 1.5%, and if it is outside this range, the effect of refining the crystal grain size is reduced, and the improvement effect of mechanical strength cannot be expected. .
そして、上記組成のマグネシウム合金からなる鋳造素材に、２５０〜５００℃で塑性加工を施すと、高温での高い疲労強度を出現でき、２５０〜５００℃での塑性加工後のマグネシウム合金部材は、自動車エアコン用圧縮機の機構部品に要求される機械的強度及び高温での疲労強度である、室温における０．２％耐力が３００ＭＰａ以上、１５０℃における疲労強度が１００ＭＰａ以上を出現する。
尚、塑性加工の温度が２５０℃を下回ると、充分な歪み量を確保できないために成形ができず、割れなどが発生し、また、５００℃を上回ると、高温酸化や部分的な溶解が発生し、疲労強度の向上効果は期待できない。
And if the casting material which consists of a magnesium alloy of the said composition is plastically processed at 250-500 degreeC, the high fatigue strength in high temperature can appear, and the magnesium alloy member after plastic working at 250-500 degreeC is an automobile. The mechanical strength required for the mechanical parts of the compressor for an air conditioner and the fatigue strength at high temperature appear as 0.2% proof stress at room temperature of 300 MPa or more, and fatigue strength at 150 ° C. of 100 MPa or more.
If the plastic working temperature is below 250 ° C., a sufficient amount of strain cannot be secured, so that molding cannot be performed and cracking occurs, and if it exceeds 500 ° C., high temperature oxidation or partial melting occurs. However, the improvement effect of fatigue strength cannot be expected.
ここで、前記塑性加工後に、溶体化処理及び人工時効処理を施すことができ、好ましくは、塑性加工後に、４５０〜５１０℃の処理温度に０．０８時間以上保持する溶体化処理を施した後、１５０〜２５０℃の処理温度に０．３時間以上保持する人工時効処理を施すことが好ましい。
溶体化加熱の処理温度が４５０〜５１０℃の範囲であると、粒界及び粒内が微細な析出物によって強化され、局所変形が抑えられ、均一変形領域が大きくなるために、高温での加工軟化が起こり難くなり、高温疲労強度が向上する。
Here, after the plastic working, a solution treatment and an artificial aging treatment can be performed. Preferably, after the plastic working, a solution treatment for holding at a processing temperature of 450 to 510 ° C. for 0.08 hours or more is performed. It is preferable to perform an artificial aging treatment in which a treatment temperature of 150 to 250 ° C. is maintained for 0.3 hours or more.
When the treatment temperature for solution heating is in the range of 450 to 510 ° C., the grain boundaries and the inside of the grains are strengthened by fine precipitates, local deformation is suppressed, and the uniform deformation region becomes large. Softening hardly occurs and high temperature fatigue strength is improved.
溶体化加熱の処理温度が４５０℃を下回ると、固溶体が形成し難くなり、粒界及び粒内の析出物の量が低下し、適正な状態とならず、高温疲労強度の向上は期待できない。一方、溶体化加熱の処理温度が５１０℃を上回ると、合金の一部が溶融するバーニングが生じ、気孔欠陥が生じる。
また、溶体化加熱の処理時間は、０．０８時間を下回ると、十分な溶体化処理ができないので、保持時間は０．０８時間よりも長いことが好ましい。
When the treatment temperature for solution heating is lower than 450 ° C., it is difficult to form a solid solution, the amount of precipitates in the grain boundaries and grains is reduced, and an appropriate state cannot be obtained, and improvement in high temperature fatigue strength cannot be expected. On the other hand, when the treatment temperature for solution heating exceeds 510 ° C., burning occurs in which a part of the alloy melts, resulting in pore defects.
Further, if the solution heat treatment time is less than 0.08 hours, sufficient solution treatment cannot be performed, and therefore, the holding time is preferably longer than 0.08 hours.
また、焼入れに使用する冷却は、温水であってもよいし、なんらかの添加剤を加えたものでもよく、公知の焼入れ用の冷却であれば様々なものを適用できる。
人工時効処理における処理温度が１５０℃を下回ると、適正な硬さに向上させるために処理時間が長くなり、処理温度が２５０℃を上回ると、硬さ及び強度が低下してしまうので、人工時効処理における処理温度は、１５０〜２５０℃の範囲とすることが好ましい。
The cooling used for quenching may be warm water or may be added with any additive, and various types of cooling can be applied as long as they are known quenching cooling.
When the treatment temperature in the artificial aging treatment is lower than 150 ° C, the treatment time becomes longer in order to improve to an appropriate hardness, and when the treatment temperature exceeds 250 ° C, the hardness and strength are reduced. The treatment temperature in the treatment is preferably in the range of 150 to 250 ° C.
また、人工時効処理の保持時間が０．３時間を下回ると、十分な時効硬化が得られないので、人工時効処理における保持時間は、０．３時間以上とすることが好ましい。
前記塑性加工として、押出し加工を施すことができ、押出し加工を２５０〜５００℃で行えば、割れや表面酸化を抑制しつつ、疲労強度を向上させることができる。
また、上記のマグネシウム合金部材を、エアコン用圧縮機の機構部品に使用することができる。
Further, if the retention time of the artificial aging treatment is less than 0.3 hours, sufficient age hardening cannot be obtained. Therefore, the retention time in the artificial aging treatment is preferably 0.3 hours or more.
Extrusion can be performed as the plastic processing, and if the extrusion is performed at 250 to 500 ° C., fatigue strength can be improved while suppressing cracking and surface oxidation.
Moreover, said magnesium alloy member can be used for the mechanism components of the compressor for air conditioners.
本発明によると、自動車エアコン用圧縮機の機構部品に適用可能な機械的強度及び高温での疲労強度、具体的には、室温の０．２％耐力が３００ＭＰａ以上、１５０℃の疲労強度が１００ＭＰａ以上を出現できるマグネシウム合金部材を提供でき、更に、係るマグネシウム合金部材を機構部品に使用したエアコン用圧縮機を提供できる。
従来、自動車エアコン用圧縮機の機構部品には、高強度アルミニウム合金が用いられているが、本発明によると、高強度アルミニウム合金と略同等の機械的強度（引張強度）及び高温疲労強度をマグネシウム合金部材において出現できるから、高強度アルミニウム合金に比べて低比重であるマグネシウム合金部材への置き換えが可能となり、自動車エアコン用圧縮機の大幅な重量低減を実現できる。
According to the present invention, mechanical strength applicable to mechanical parts of compressors for automobile air conditioners and fatigue strength at high temperature, specifically, 0.2% proof stress at room temperature is 300 MPa or more, and fatigue strength at 150 ° C. is 100 MPa. The magnesium alloy member which can appear the above can be provided, and furthermore, the compressor for an air conditioner which uses the magnesium alloy member for the mechanical part can be provided.
Conventionally, high-strength aluminum alloys have been used for mechanical parts of compressors for automobile air conditioners. According to the present invention, however, mechanical strength (tensile strength) and high-temperature fatigue strength substantially the same as high-strength aluminum alloys are achieved with magnesium. Since it can appear in an alloy member, it can be replaced with a magnesium alloy member having a specific gravity lower than that of a high-strength aluminum alloy, and a significant weight reduction of a compressor for an automotive air conditioner can be realized.
以下、本発明の実施形態を詳細に説明する。
表１は、マグネシウム合金におけるアルミニウムＡｌ、カルシウムＣａ、マンガンＭｎの含有率（質量％）を変更した複数種の試料それぞれにおける室温（例えば１０〜３５℃）での引張強度（ＭＰａ）及び０．２％耐力（ＭＰａ）を示す。
表１の「判定」は、０．２％耐力が、自動車エアコン用圧縮機の機構部品に要求される値である３００ＭＰａ以上であることを○印で示し、０．２％耐力が３００ＭＰａ未満であることを×印で示すものである。
Hereinafter, embodiments of the present invention will be described in detail.
Table 1 shows tensile strength (MPa) at room temperature (for example, 10 to 35 ° C.) and 0.2 for each of a plurality of types of samples in which the contents (mass%) of aluminum Al, calcium Ca, and manganese Mn in the magnesium alloy are changed. % Yield strength (MPa).
“Decision” in Table 1 indicates that the 0.2% proof stress is 300 MPa or more, which is a value required for a mechanical part of a compressor for an automobile air conditioner, and the 0.2% proof stress is less than 300 MPa. This is indicated by a cross.
０．２％耐力の要求値としての３００ＭＰａは、自動車エアコン用圧縮機の機構部品に用いられているアルミニウム合金鍛造材（Ｔ６処理：溶体化処理後、人工時効処理）の０．２％耐力を基準として設定した。
表１の結果を得た試料は、表中の含有率としたマグネシウム合金の鋳造品を作成し、この鋳造素材に塑性加工（熱間間接押出加工）を施したものであり、熱処理（Ｔ６処理）を施していないものである。
300MPa as a required value of 0.2% proof stress is 0.2% proof stress of aluminum alloy forging material (T6 treatment: solution heat treatment, artificial aging treatment) used for mechanical parts of compressors for automotive air conditioners. Set as a reference.
Samples obtained from the results in Table 1 were prepared by casting a magnesium alloy having the contents shown in the table, and subjecting the cast material to plastic working (hot indirect extrusion), and heat treatment (T6 treatment). ) Is not given.
より詳細には、合金溶製は電気抵抗炉を用いて大気中で行い、溶湯の酸化防止には、ＳＦ6とＣＯ2の混合ガスを用いた。そして、攪拌後に、Ｃａ添加時の酸化物除去のためＡｒガスを流してバブリングを行い、３００℃に加熱したビレット用金型に鋳込んで、鋳造素材を作製した。
また、間接押出加工には油圧プレス機を用い、３５０℃に加熱した金型の中に、押出し加工用の試料を投入し、１０分間保持してから、押出し比を２０とした押出し加工を開始した。尚、押出し比とは、塑性加工前の断面積／塑性加工後の断面積である。
More specifically, alloy melting was performed in the air using an electric resistance furnace, and a mixed gas of SF 6 and CO 2 was used to prevent oxidation of the molten metal. Then, after stirring, Ar gas was flowed for bubbling to remove oxide when Ca was added, and cast into a billet mold heated to 300 ° C. to prepare a casting material.
For indirect extrusion, use a hydraulic press machine and put the sample for extrusion into a mold heated to 350 ° C, hold it for 10 minutes, then start extrusion with an extrusion ratio of 20. did. The extrusion ratio is the cross-sectional area before plastic working / the cross-sectional area after plastic working.
また、押出し材の引張特性を評価するための引張試験においては、万能試験機を用いる一方、押出し方向と荷重負荷方向とが平行になるように試験片を採取し、試験部直径４mm、評点距離２０mmのＪＩＳ１４Ａ号試験片を作製し、試験速度は、初期ひずみ速度１×１０−3ｓ−1の条件で行った。
表１の最下段は、ＪＩＳ規定素材であるＡｌ合金鍛造材（Ａ４０３２−Ｔ６）での引張強度（ＭＰａ）及び０．２％耐力（ＭＰａ）を参考値として示してあり、表中の「判定」は、このＡｌ合金鍛造材（Ａ４０３２−Ｔ６）の０．２％耐力である３００ＭＰａ以上であるか否かを示す。
In the tensile test to evaluate the tensile properties of the extruded material, a universal testing machine is used, while a test piece is taken so that the extrusion direction and the load loading direction are parallel, and the test part diameter is 4 mm and the rating distance is A 20 mm JIS14A test piece was prepared, and the test speed was the initial strain rate of 1 × 10 −3 s −1 .
The bottom row of Table 1 shows the tensile strength (MPa) and 0.2% proof stress (MPa) of the JIS prescribed material Al alloy forging (A4032-T6) as reference values. "" Indicates whether the Al alloy forging material (A4032-T6) has a 0.2% proof stress of 300 MPa or more.
表１において、実施例１〜１１の試料は、カルシウムＣａを０．３〜１０％、アルミニウムＡｌを０．２〜１５％、マンガンＭｎを０．０５〜１．５％含有し、カルシウムＣａ／アルミニウムＡｌの質量比が０．６〜１．７であり、残部がマグネシウムＭｇ及び不可避不純物からなるマグネシウム合金の鋳造素材に、３５０℃の塑性加工（押出し加工）を施したものである。
一方、比較例１〜７の試料は、カルシウムＣａの含有率、アルミニウムＡｌの含有率、マンガンＭｎの含有率、カルシウムＣａ／アルミニウムＡｌの質量比のうちの少なくとも１つが、前記範囲から外れているマグネシウム合金の鋳造素材に、３５０℃の塑性加工（押出し加工）を施したものである。
In Table 1, the samples of Examples 1 to 11 contain calcium Ca 0.3 to 10%, aluminum Al 0.2 to 15%, manganese Mn 0.05 to 1.5%, and calcium Ca / A mass ratio of aluminum Al is 0.6 to 1.7, and a cast material of a magnesium alloy consisting of magnesium Mg and inevitable impurities is subjected to plastic processing (extrusion processing) at 350 ° C.
On the other hand, in the samples of Comparative Examples 1 to 7, at least one of the content ratio of calcium Ca, the content ratio of aluminum Al, the content ratio of manganese Mn, and the mass ratio of calcium Ca / aluminum Al is out of the above range. A magnesium alloy casting material is subjected to plastic processing (extrusion processing) at 350 ° C.
尚、表１における「Ｃａ＋Ａｌ」は、カルシウムＣａとアルミニウムＡｌとの合計の質量％を示す。
表１に示すように、カルシウムＣａの含有率＝０．３〜１０％、アルミニウムＡｌの含有率＝０．２〜１５％、マンガンＭｎの含有率＝０．０５〜１．５％、カルシウムＣａ／アルミニウムＡｌの質量比０．６〜１．７を満たす実施例１〜７の試料は、いずれも０．２％耐力が要求値である３００ＭＰａ以上であり、自動車エアコン用圧縮機の機構部品に要求される機械的強度を満たしており、圧縮機の機構部品として用いることができることを示している。
Note that “Ca + Al” in Table 1 represents the total mass% of calcium Ca and aluminum Al.
As shown in Table 1, calcium Ca content = 0.3-10%, aluminum Al content = 0.2-15%, manganese Mn content = 0.05-1.5%, calcium Ca The samples of Examples 1 to 7 satisfying the mass ratio of aluminum / aluminum Al of 0.6 to 1.7 all have a 0.2% proof stress of 300 MPa or more, which is a required value. It indicates that it meets the required mechanical strength and can be used as a mechanical component of a compressor.
これに対し、カルシウムＣａの含有率が０．３〜１０％の範囲を外れる比較例１及び比較例４、また、アルミニウムＡｌの含有率が０．２〜１５％の範囲を外れる比較例２及び比較例３では、０．２％耐力が要求値である３００ＭＰａを下回り、圧縮機の機構部品として用いることができないことを示している。
また、カルシウムＣａの含有率及びアルミニウムＡｌの含有率が、０．２〜１５％の範囲内であっても、比較例５及び比較例６のように、カルシウムＣａ／アルミニウムＡｌの質量比が０．６〜１．７の範囲を外れると、０．２％耐力が要求値である３００ＭＰａを下回り、圧縮機の機構部品として用いることができないことを示している。
On the other hand, Comparative Example 1 and Comparative Example 4 in which the Ca Ca content is outside the range of 0.3 to 10%, and Comparative Example 2 in which the Al content is outside the range of 0.2 to 15% and In Comparative Example 3, the 0.2% proof stress is lower than the required value of 300 MPa, indicating that it cannot be used as a mechanical part of the compressor.
Moreover, even if the content rate of calcium Ca and the content rate of aluminum Al are in the range of 0.2 to 15%, the mass ratio of calcium Ca / aluminum Al is 0 as in Comparative Example 5 and Comparative Example 6. Outside the range of .6 to 1.7, the 0.2% proof stress is below the required value of 300 MPa, indicating that it cannot be used as a mechanical part of the compressor.
更に、カルシウムＣａの含有率及びアルミニウムＡｌの含有率が０．３〜１０％の範囲内であり、かつ、カルシウムＣａ／アルミニウムＡｌの質量比が０．６〜１．７の範囲内であっても、マンガンＭｎを含有しない比較例７では、０．２％耐力が要求値である３００ＭＰａを下回り、圧縮機の機構部品として用いることができないことを示している。
即ち、上記引張試験の結果から、カルシウムＣａの含有率＝０．３〜１０％、アルミニウムＡｌの含有率＝０．２〜１５％、マンガンＭｎの含有率＝０．０５〜１．５％、カルシウムＣａ／アルミニウムＡｌの質量比＝０．６〜１．７を満足するマグネシウム合金であることが、自動車エアコン用圧縮機の機構部品に要求される機械的強度（０．２％耐力が３００ＭＰａ以上）を得るための条件となることが分かる。
Furthermore, the calcium Ca content and the aluminum Al content are in the range of 0.3 to 10%, and the calcium Ca / aluminum Al mass ratio is in the range of 0.6 to 1.7. However, in Comparative Example 7 containing no manganese Mn, the 0.2% proof stress is lower than the required value of 300 MPa, indicating that it cannot be used as a mechanical part of the compressor.
That is, from the results of the tensile test, the content ratio of calcium Ca = 0.3 to 10%, the content ratio of aluminum Al = 0.2 to 15%, the content ratio of manganese Mn = 0.05 to 1.5%, It is a magnesium alloy satisfying the mass ratio of calcium Ca / aluminum Al = 0.6 to 1.7. Mechanical strength required for mechanical parts of a compressor for an automotive air conditioner (0.2% proof stress is 300 MPa or more) It turns out that it becomes the conditions for obtaining.
カルシウムＣａとアルミニウムＡｌとの双方を添加することで、Ｍｇ‐Ｃａ系化合物と、Ｍｇ‐Ａｌ‐Ｃａ系化合物が粒界に晶出し、室温での機械的強度及び耐熱性が向上するが、実施例１〜１１のように、カルシウムＣａ／アルミニウムＡｌの質量比を０．６〜１．７とした場合、Ｍｇ‐Ｃａ系化合物であるＭｇ2Ｃａと、Ｍｇ‐Ａｌ‐Ｃａ系化合物である（Ｍｇ，Ａｌ）2Ｃａとが同時に晶出し、機械的強度と耐熱性とが向上したものと推察される。
これに対し、比較例６のように、カルシウムＣａ／アルミニウムＡｌの質量比が１．７よりも大きくなると、Ｍｇ2Ｃａのみ、若しくは、僅かな（Ｍｇ，Ａｌ）2Ｃａが晶出する程度となることで、機械的強度を十分に向上させることができず、また、比較例５のように、カルシウムＣａ／アルミニウムＡｌの質量比が０．６よりも小さくなると、Ｍｇ‐Ａｌ系化合物であるβ‐Ｍｇ17Ａｌ12が晶出し、耐熱性に悪影響を及ぼしたものと推察される。
By adding both calcium Ca and aluminum Al, the Mg-Ca compound and Mg-Al-Ca compound crystallize at the grain boundary, improving the mechanical strength and heat resistance at room temperature. As in Examples 1 to 11, when the mass ratio of calcium Ca / aluminum Al is 0.6 to 1.7, Mg 2 Ca which is an Mg—Ca compound and Mg—Al—Ca compound ( It is presumed that Mg, Al) 2 Ca was crystallized at the same time, and mechanical strength and heat resistance were improved.
On the other hand, as in Comparative Example 6, when the mass ratio of calcium Ca / aluminum Al is greater than 1.7, only Mg 2 Ca or a slight amount of (Mg, Al) 2 Ca is crystallized. Thus, the mechanical strength cannot be sufficiently improved, and when the mass ratio of calcium Ca / aluminum Al is smaller than 0.6 as in Comparative Example 5, the Mg-Al compound is obtained. It is inferred that β-Mg 17 Al 12 crystallized and adversely affected the heat resistance.
また、比較例７のように、カルシウムＣａ／アルミニウムＡｌの質量比を０．６〜１．７の範囲内としても、マンガンＭｎを添加しない場合には機械的強度が不足するのに対し、実施例１〜１１のように、マンガンＭｎを少量添加することで、０．２％耐力を３００ＭＰａ以上とすることができる。これは、マンガンＭｎを少量添加することで、結晶粒径が微細化し、機械的強度が向上したものと推定される。マンガンＭｎの添加量は、０．０５〜１．５％の範囲が適切であり、この範囲を外れると、結晶粒径の微細化の効果が低くなって、機械的強度の向上効果は期待できない。 Further, as in Comparative Example 7, even when the mass ratio of calcium Ca / aluminum Al is in the range of 0.6 to 1.7, the mechanical strength is insufficient when manganese Mn is not added. Like Examples 1-11, 0.2% yield strength can be 300 Mpa or more by adding a small amount of manganese Mn. This is presumed that the crystal grain size was refined and the mechanical strength was improved by adding a small amount of manganese Mn. The amount of manganese Mn added is suitably in the range of 0.05 to 1.5%, and if it is outside this range, the effect of refining the crystal grain size is reduced, and the improvement effect of mechanical strength cannot be expected. .
表２は、表１に示した実施例３の含有率、即ち、カルシウムＣａを３．３％、アルミニウムＡｌを３．７％、マンガンＭｎを０．３３％、カルシウムＣａ／アルミニウムＡｌの質量比が０．８９、カルシウムＣａとアルミニウムＡｌとの合計を７％としたマグネシウム合金の鋳造素材を試料とし、この鋳造素材に施す押出し加工（塑性加工）における押出比及び押出温度を複数種に異ならせ、押出し加工後の試料それぞれにおける０．２％耐力を求めた試験結果を示す。
表２に示す試験では、押出し比を１０，２０，４０，６０の４種類に設定したが、それぞれの押出し比における押出し温度が、２５０〜５００℃の範囲内であれば、割れや表面酸化が発生することなく、０．２％耐力が要求値である３００ＭＰａを上回った。
Table 2 shows the content of Example 3 shown in Table 1, that is, calcium Ca 3.3%, aluminum Al 3.7%, manganese Mn 0.33%, calcium Ca / aluminum Al mass ratio. A magnesium alloy casting material having a total of 7% of calcium Ca and aluminum Al is used as a sample, and the extrusion ratio and extrusion temperature in the extrusion processing (plastic processing) applied to this casting material are varied among several types. The test result which calculated | required 0.2% yield strength in each sample after an extrusion process is shown.
In the tests shown in Table 2, the extrusion ratios were set to four types of 10, 20, 40, and 60. If the extrusion temperatures at the respective extrusion ratios were in the range of 250 to 500 ° C., cracks and surface oxidation occurred. Without generating, the 0.2% proof stress exceeded the required value of 300 MPa.
これに対し、押出し比を２０としたときに、押出し温度を２５０〜５００℃の範囲を下回る２３０℃とすると割れが発生して機械的強度が得られず、また、押出し温度を２５０〜５００℃の範囲を上回る５１７℃とすると、表面酸化が発生して、０．２％耐力が要求値である３００ＭＰａを下回った。
即ち、塑性加工（押出し加工）の温度を、２５０〜５００℃の範囲内とすることで、３００ＭＰａ以上の０．２％耐力を出現できることが分かる。塑性加工の温度が２５０℃を下回る場合には、充分な歪み量を確保できないために成形ができず、割れなどが発生し、また、５００℃を上回る場合には、高温酸化や部分的な溶解が発生することで、疲労強度の向上効果は期待できない。
On the other hand, when the extrusion ratio is set to 20, if the extrusion temperature is 230 ° C. below the range of 250 to 500 ° C., cracking occurs and mechanical strength cannot be obtained, and the extrusion temperature is 250 to 500 ° C. When the temperature was 517 ° C. exceeding the range, surface oxidation occurred, and the 0.2% proof stress was lower than the required value of 300 MPa.
That is, it can be seen that 0.2% proof stress of 300 MPa or more can appear when the temperature of plastic working (extrusion processing) is in the range of 250 to 500 ° C. When the temperature of plastic working is below 250 ° C, a sufficient amount of strain cannot be secured, so molding cannot be performed and cracks occur. When the temperature is above 500 ° C, high temperature oxidation or partial dissolution occurs. The occurrence of fatigue strength cannot be expected due to the occurrence of.
表３は、２５０〜５００℃の塑性加工後（押出し加工後）に、熱処理（Ｔ６処理）を施した場合と、熱処理（Ｔ６処理）を施さなかった場合とで、それぞれに１５０℃疲労強度（高温疲労強度）を計測した結果を示す。
尚、試料としては、表１に示した実施例３の含有率、即ち、カルシウムＣａを３．３％、アルミニウムＡｌを３．７％、マンガンＭｎを０．３３％、カルシウムＣａ／アルミニウムＡｌの質量比が０．８９、カルシウムＣａとアルミニウムＡｌとの合計を７％としたマグネシウム合金の鋳造素材を、押出し比２０、押出し温度３５０℃で押出し加工したものを用いた。
Table 3 shows the fatigue strength of 150 ° C. (when the heat treatment (T6 treatment) is performed after the plastic working (after extrusion) at 250 to 500 ° C. and when the heat treatment (T6 treatment) is not performed. The results of measuring high temperature fatigue strength) are shown.
In addition, as a sample, the content rate of Example 3 shown in Table 1, that is, calcium Ca is 3.3%, aluminum Al is 3.7%, manganese Mn is 0.33%, calcium Ca / aluminum Al. A magnesium alloy casting material having a mass ratio of 0.89 and a total of calcium Ca and aluminum Al of 7% was extruded at an extrusion ratio of 20 and an extrusion temperature of 350 ° C.
更に、表３には、比較対象として、ＪＩＳ規定素材であるＡｌ合金鍛造材（Ａ４０３２−Ｔ６）における１５０℃疲労強度を示してある。前述のように、Ａｌ合金鍛造材（Ａ４０３２−Ｔ６）は、自動車エアコン用圧縮機に用いられているから、このＡ４０３２−Ｔ６の１５０℃疲労強度（１００ＭＰａ）以上の１５０℃疲労強度を出現できれば、Ａ４０３２−Ｔ６に代わる部材として用いることができることになる。
表３の疲労強度を得た疲労試験（回転曲げ試験）及び疲労強度の算出は、日本機械学会編「日本機械学会基準 統計的疲労試験方法（改訂版）ＪＳＭＥ Ｓ−００２−１９９４」に準じて行い、試験温度１５０℃、回転数３０００rpm、周波数５０Ｈｚ、応力比Ｒ＝−１で行った。表３の疲労強度は、１０7回での結果である。
Further, Table 3 shows the 150 ° C. fatigue strength of an Al alloy forged material (A4032-T6), which is a JIS specified material, as a comparison object. As described above, since the Al alloy forging material (A4032-T6) is used in a compressor for an automobile air conditioner, if 150 ° C fatigue strength equal to or higher than 150 ° C fatigue strength (100 MPa) of this A4032-T6 can appear, It can be used as a member that replaces A4032-T6.
The fatigue test (rotary bending test) for obtaining the fatigue strengths shown in Table 3 and the calculation of the fatigue strength are in accordance with the Japan Society of Mechanical Engineers, “The Japan Society of Mechanical Engineers Standard Statistical Fatigue Test Method (Revised Version) JSME S-002-1994”. The test was performed at a test temperature of 150 ° C., a rotation speed of 3000 rpm, a frequency of 50 Hz, and a stress ratio R = −1. The fatigue strength in Table 3 is the result at 10 7 times.
疲労試験に用いた試験片は、丸棒型試験片であって、チャック部の径を８．５mm、破断部の径を４mmとし、押出し方向と荷重負荷方向とが垂直になるように採取し、破断部は、切削による条痕の影響を無くすため、耐水研磨紙にて研磨した後、仕上げにバフ研磨した。
また、Ｔ６処理として、横型管状炉を用いて５００℃のＡｒガス気流中に３０分（０．５時間）保持する溶体化処理後、１８０℃のオイルバスを用いて２時間の人工時効処理を施した。尚、熱処理時間（保持時間）は、試料を投入してからの時間である。
The test piece used for the fatigue test is a round bar type test piece with a chuck part diameter of 8.5 mm and a fracture part diameter of 4 mm, which is taken so that the direction of extrusion and the direction of load loading are perpendicular. In order to eliminate the influence of the streak due to cutting, the fractured portion was polished with water-resistant abrasive paper and then buffed to finish.
In addition, as a T6 treatment, after a solution treatment for 30 minutes (0.5 hours) in a 500 ° C. Ar gas stream using a horizontal tubular furnace, an artificial aging treatment for 2 hours using a 180 ° C. oil bath is performed. gave. The heat treatment time (holding time) is the time after the sample is introduced.
表３に示したように、Ａ４０３２−Ｔ６の１５０℃疲労強度が１００ＭＰａであるのに対し、２５０〜５００℃の温度で塑性加工（３５０℃での押出し加工）を行った後、熱処理（Ｔ６処理）を施さなかったマグネシウム合金部材の１５０℃疲労強度は１１７ＭＰａであるのに対し、同じ素材で同じ塑性加工を施した後に、更に熱処理（Ｔ６処理）を施したマグネシウム合金部材の１５０℃疲労強度は１３２ＭＰａであった。 As shown in Table 3, the A4032-T6 has a fatigue strength of 100 MPa at 150 ° C., but after performing plastic working (extrusion at 350 ° C.) at a temperature of 250 to 500 ° C., heat treatment (T6 treatment) The 150 ° C. fatigue strength of the magnesium alloy member that was not subjected to () was 117 MPa, whereas the 150 ° C. fatigue strength of the magnesium alloy member that was further heat-treated (T6 treatment) after the same plastic working with the same material was It was 132 MPa.
即ち、カルシウムＣａの含有率＝０．３〜１０％、アルミニウムＡｌの含有率＝０．２〜１５％、マンガンＭｎの含有率＝０．０５〜１．５％、カルシウムＣａ／アルミニウムＡｌの質量比＝０．６〜１．７であるマグネシウム合金の鋳造素材に対し、２５０〜５００℃の塑性加工を施せば、熱処理（Ｔ６処理）を施さなくてもＡ４０３２−Ｔ６を上回る１５０℃疲労強度を出現できる。そして、熱処理（Ｔ６処理）を施せば、熱処理（Ｔ６処理）を施さなかった場合に比べて更に１５０℃疲労強度を向上させることができる。 That is, calcium Ca content = 0.3-10%, aluminum Al content = 0.2-15%, manganese Mn content = 0.05-1.5%, calcium Ca / aluminum Al mass If a magnesium alloy casting material having a ratio of 0.6 to 1.7 is subjected to plastic working at 250 to 500 ° C., 150 ° C. fatigue strength exceeding A4032-T6 can be obtained even without heat treatment (T6 treatment). Can appear. And if heat processing (T6 process) is given, 150 degreeC fatigue strength can be improved further compared with the case where heat processing (T6 process) is not given.
換言すれば、カルシウムＣａの含有率＝０．３〜１０％、アルミニウムＡｌの含有率＝０．２〜１５％、マンガンＭｎの含有率＝０．０５〜１．５％、カルシウムＣａ／アルミニウムＡｌの質量比＝０．６〜１．７であるマグネシウム合金の鋳造素材に対し、２５０〜５００℃の塑性加工を施して形成したマグネシウム合金部材は、熱処理（Ｔ６処理）を施さなくても、自動車エアコン用圧縮機の機構部品に用いることができる室温での０．２％耐力及び高温での疲労強度、具体的には、３００ＭＰａ以上の室温０．２％耐力及び１００ＭＰａ以上の１５０℃疲労強度を出現でき、更に、熱処理（Ｔ６処理）を施せば、高温での疲労強度がより強くなる。
従って、高強度アルミニウム合金を用いていた自動車エアコン用圧縮機の機構部品を、マグネシウム合金部材で形成することができ、これによって圧縮機の大幅な重量低減を実現できる。
In other words, calcium Ca content = 0.3-10%, aluminum Al content = 0.2-15%, manganese Mn content = 0.05-1.5%, calcium Ca / aluminum Al The magnesium alloy member formed by subjecting the magnesium alloy casting material having a mass ratio of 0.6 to 1.7 to plastic processing at 250 to 500 ° C. without subjecting to heat treatment (T6 treatment) can be used for automobiles. 0.2% proof stress at room temperature and fatigue strength at high temperatures that can be used for mechanical parts of air conditioner compressors, specifically, 0.2% proof stress at room temperature of 300 MPa or higher and 150 ° C. fatigue strength of 100 MPa or higher. In addition, if heat treatment (T6 treatment) is performed, the fatigue strength at high temperatures becomes stronger.
Therefore, the mechanical parts of the compressor for an automotive air conditioner that uses a high-strength aluminum alloy can be formed of a magnesium alloy member, thereby realizing a significant weight reduction of the compressor.
ところで、熱処理（Ｔ６処理）では、塑性加工（押出し加工）後に行う溶体化処理において、４５０〜５１０℃の処理温度に０．０８時間以上保持することが好ましく、また、焼入れ処理後に行う人工時効処理において、１５０〜２５０℃の処理温度に０．３時間以上保持することが好ましい。
溶体化加熱の処理温度が４５０〜５１０℃の範囲であると、粒界及び粒内が微細な析出物によって強化され、局所変形が抑えられ、均一変形領域が大きくなるために、高温での加工軟化が起こり難くなり、高温疲労強度を向上させることができる。
By the way, in heat treatment (T6 treatment), it is preferable to hold at a treatment temperature of 450 to 510 ° C. for 0.08 hours or more in a solution treatment performed after plastic processing (extrusion processing), and an artificial aging treatment performed after quenching treatment. In this case, it is preferable to hold at a processing temperature of 150 to 250 ° C. for 0.3 hours or longer.
When the treatment temperature for solution heating is in the range of 450 to 510 ° C., the grain boundaries and the inside of the grains are strengthened by fine precipitates, local deformation is suppressed, and the uniform deformation region becomes large. Softening hardly occurs and high temperature fatigue strength can be improved.
これに対し、溶体化加熱の処理温度が４５０℃を下回ると、固溶体が形成し難くなり、粒界及び粒内の析出物が低下し、適正な状態とならず、高温疲労強度の向上は期待できない。一方、溶体化加熱の処理温度が５１０℃を上回ると、合金の一部が溶融するバーニングが生じ、気孔欠陥が生じてしまう。
また、溶体化加熱の処理時間は、０．０８時間を下回ると、十分な溶体化処理ができないので、保持時間は０．０８時間よりも長いことが好ましい。
On the other hand, when the treatment temperature for solution heating is lower than 450 ° C., it is difficult to form a solid solution, and the precipitates in the grain boundaries and grains are lowered and do not become an appropriate state, and an improvement in high temperature fatigue strength is expected. Can not. On the other hand, if the treatment temperature for solution heating exceeds 510 ° C., burning occurs in which a part of the alloy melts, resulting in pore defects.
Further, if the solution heat treatment time is less than 0.08 hours, sufficient solution treatment cannot be performed, and therefore, the holding time is preferably longer than 0.08 hours.
また、人工時効処理における処理温度が１５０℃を下回ると、適正な硬さに向上させるために処理時間が長くなり、処理温度が２５０℃を上回ると、硬さ及び強度が低下してしまうので、人工時効処理における処理温度は、１５０〜２５０℃の範囲とすることが好ましい。
また、人工時効処理の保持時間が０．３時間を下回ると、十分な時効硬化が得られないので、人工時効処理における保持時間は、０．３時間以上とすることが好ましい。
表３の結果を得た熱処理（Ｔ６処理）における温度及び保持時間は、前述の温度範囲及び時間範囲を満たしている。
In addition, when the processing temperature in the artificial aging treatment is lower than 150 ° C., the processing time is increased to improve the appropriate hardness, and when the processing temperature is higher than 250 ° C., the hardness and strength are reduced. The treatment temperature in the artificial aging treatment is preferably in the range of 150 to 250 ° C.
Further, if the retention time of the artificial aging treatment is less than 0.3 hours, sufficient age hardening cannot be obtained. Therefore, the retention time in the artificial aging treatment is preferably 0.3 hours or more.
The temperature and holding time in the heat treatment (T6 treatment) from which the results shown in Table 3 were obtained satisfy the above temperature range and time range.
以上説明したように、本発明に係るマグネシウム合金部材及びマグネシウム合金部材の製造方法によると、自動車エアコン用圧縮機の機構部品に要求される、室温における０．２％耐力が３００ＭＰａ以上、１５０℃における疲労強度が１００ＭＰａ以上を出現でき、従来使用していたＡｌ合金鍛造材Ａ４０３２に置き換えて用いることができる。
そして、マグネシウム合金部材の比重は、Ａｌ合金鍛造材Ａ４０３２よりも小さいので、自動車エアコン用圧縮機の機構部品を、マグネシウム合金で形成すれば、圧縮機の重量を大きく低減でき、車両の軽量化、引いては燃費性能の改善に寄与できる。
As described above, according to the magnesium alloy member and the magnesium alloy member manufacturing method according to the present invention, the 0.2% proof stress at room temperature required for the mechanical parts of the compressor for an automotive air conditioner is 300 MPa or more, at 150 ° C. A fatigue strength of 100 MPa or more can appear, and it can be used in place of the conventionally used Al alloy forging material A4032.
And since the specific gravity of the magnesium alloy member is smaller than the Al alloy forging material A4032, if the mechanical parts of the compressor for an automotive air conditioner are formed of a magnesium alloy, the weight of the compressor can be greatly reduced, the weight of the vehicle can be reduced, It can contribute to improving fuel efficiency.
本発明に係るマグネシウム合金部材及びマグネシウム合金部材を適用する自動車エアコン用圧縮機の機構部品としては、斜板式圧縮機用シューやピストン、及び、スクロール式圧縮機用うず巻体などがある。
尚、本発明に係るマグネシウム合金部材及びマグネシウム合金部材の製造方法は、自動車エアコン用圧縮機の機構部品に適用することを前提として開発されたものであるが、適用対象を自動車エアコン用圧縮機の機構部品に限定するものではなく、定置式エアコン圧縮機の機構部品に適用することも可能である。
また、塑性加工を押出し加工に限定するものでもなく、鍛造加工、圧延加工、引き抜き加工などであってもよい。
Examples of the mechanical parts of the magnesium alloy member and the compressor for an automotive air conditioner to which the magnesium alloy member according to the present invention is applied include a swash plate compressor shoe and a piston, and a scroll compressor spiral.
The magnesium alloy member and the manufacturing method of the magnesium alloy member according to the present invention were developed on the premise that they are applied to mechanical parts of a compressor for an automobile air conditioner. The present invention is not limited to mechanical parts, but can be applied to mechanical parts of stationary air conditioner compressors.
Further, the plastic processing is not limited to extrusion processing, and may be forging processing, rolling processing, drawing processing, or the like.
Claims (10)
Priority Applications (6)
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| JP2010244816A JP2012097309A (en) | 2010-10-29 | 2010-10-29 | Magnesium alloy member, compressor for air conditioner, and method for manufacturing magnesium alloy member |
| CN2011800520477A CN103180472A (en) | 2010-10-29 | 2011-10-28 | Magnesium-alloy member, compressor for use in air conditioner, and method for manufacturing magnesium-alloy member |
| KR1020137013196A KR20130101100A (en) | 2010-10-29 | 2011-10-28 | Magnesium-alloy member, compressor for use in air conditioner, and method for manufacturing magnesium-alloy member |
| EP11836462.9A EP2631312A4 (en) | 2010-10-29 | 2011-10-28 | Magnesium-alloy member, compressor for use in air conditioner, and method for manufacturing magnesium-alloy member |
| US13/882,470 US20130213528A1 (en) | 2010-10-29 | 2011-10-28 | Magnesium-Alloy Member, Compressor for Use in Air Conditioner, and Method for Manufacturing Magnesium-Alloy Member |
| PCT/JP2011/074959 WO2012057329A1 (en) | 2010-10-29 | 2011-10-28 | Magnesium-alloy member, compressor for use in air conditioner, and method for manufacturing magnesium-alloy member |
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| JP2010244816A JP2012097309A (en) | 2010-10-29 | 2010-10-29 | Magnesium alloy member, compressor for air conditioner, and method for manufacturing magnesium alloy member |
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| US (1) | US20130213528A1 (en) |
| EP (1) | EP2631312A4 (en) |
| JP (1) | JP2012097309A (en) |
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| JP2016169427A (en) * | 2015-03-13 | 2016-09-23 | 国立研究開発法人物質・材料研究機構 | Mg ALLOY AND PRODUCTION METHOD THEREFOR |
| JP2016169431A (en) * | 2015-03-13 | 2016-09-23 | 三協立山株式会社 | Magnesium alloy |
| JP2018044244A (en) * | 2016-09-13 | 2018-03-22 | 三協立山株式会社 | Magnesium alloy |
| CN110983217A (en) * | 2019-11-22 | 2020-04-10 | 中国兵器工业第五九研究所 | Magnesium alloy die pressing aging composite process |
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| WO2012057329A1 (en) | 2012-05-03 |
| EP2631312A1 (en) | 2013-08-28 |
| EP2631312A4 (en) | 2014-06-18 |
| CN103180472A (en) | 2013-06-26 |
| US20130213528A1 (en) | 2013-08-22 |
| KR20130101100A (en) | 2013-09-12 |
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