JP2002047525A - Al-Mg-Si BASED ALUMINUM ALLOY EXTRUSION MATERIAL FOR MACHINING - Google Patents
Al-Mg-Si BASED ALUMINUM ALLOY EXTRUSION MATERIAL FOR MACHININGInfo
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- JP2002047525A JP2002047525A JP2000309943A JP2000309943A JP2002047525A JP 2002047525 A JP2002047525 A JP 2002047525A JP 2000309943 A JP2000309943 A JP 2000309943A JP 2000309943 A JP2000309943 A JP 2000309943A JP 2002047525 A JP2002047525 A JP 2002047525A
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- Prior art keywords
- aluminum alloy
- extruded
- machinability
- based aluminum
- cutting
- Prior art date
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、製造の過程で切削
加工を多用する機械部品等に適する切削用Ａｌ−Ｍｇ−
Ｓｉ系アルミニウム合金押出材に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting Al--Mg--
The present invention relates to an extruded Si-based aluminum alloy.
【０００２】[0002]
【従来の技術】従来の切削用Ａｌ−Ｍｇ−Ｓｉ系アルミ
ニウム合金は、ＡＡ６２６２合金（Ｓｉ：０．４〜０．
８％、Ｍｇ：０．８〜１．２％、Ｃｕ：０．１５〜０．
４％、Ｐｂ：０．４〜０．７％、Ｂｉ：０．４〜０．７
％、残部Ａｌ）に代表されるように、有効添加元素とし
てＰｂ、Ｂｉ、Ｓｎ等の低融点金属を含有する。これら
低融点金属はアルミニウム中にほとんど固溶せず、アル
ミニウム合金中に粒状にミクロ偏析し、その低融点金属
粒子が切削加工時の加工発熱により溶融して切粉を分断
し、アルミニウム合金の切削性を向上させる。このＡＡ
６２６２合金は、製造の過程で切削加工、特にドリル加
工が多用される機械部品、例えば自動車のアンチスキッ
ド・ブレーキ・システムのハウジングの素材として従来
より使用されている2. Description of the Related Art A conventional Al-Mg-Si-based aluminum alloy for cutting is an AA6262 alloy (Si: 0.4 to 0.1).
8%, Mg: 0.8-1.2%, Cu: 0.15-0.
4%, Pb: 0.4-0.7%, Bi: 0.4-0.7
%, The balance Al) contains a low melting point metal such as Pb, Bi, or Sn as an effective additive element. These low-melting metals hardly form a solid solution in aluminum, but micro-segregate in granular form in the aluminum alloy, and the low-melting metal particles are melted by the heat generated during the cutting process to cut chips and cut the aluminum alloy. Improve the performance. This AA
Alloy 6262 is conventionally used as a material of a machine part that is frequently used for cutting, especially drilling in the manufacturing process, for example, a housing of an anti-skid brake system of an automobile.
【０００３】ところが、低融点金属が添加されたＡｌ−
Ｍｇ−Ｓｉ系アルミニウム合金は、切削性が向上する反
面耐食性が低下し、また、低融点金属は熱脆性を引き起
こす欠点もあり、使用環境に十分な注意を払う必要があ
った。さらに、合金をスクラップとしてリサイクルする
場合、Ｐｂ、Ｂｉ等を必要とする比較的少ない合金種に
しか転用ができず、転用範囲が狭まるためにリサイクル
性に不利であるという問題を有していた。また、機械構
造部品は耐食性、耐摩耗性又は装飾効果を高めるため
に、表面にアルマイト処理を施す場合があるが、Ｐｂや
Ｂｉが添加されたアルミニウム合金の場合、表面にＰｂ
やＢｉが露出した箇所において酸化皮膜が形成されず、
不均質で光沢のないアルマイト皮膜しか得られないとい
う問題があった。[0003] However, Al-
Mg-Si-based aluminum alloys improve machinability, but decrease corrosion resistance, and low-melting-point metals also have a drawback of causing thermal embrittlement, so that sufficient attention must be paid to the use environment. Further, when the alloy is recycled as scrap, it can be diverted to only a relatively small number of alloy types that require Pb, Bi, etc., and there is a problem in that the diverted range is narrow, which is disadvantageous for recyclability. Further, in order to enhance the corrosion resistance, abrasion resistance or decorative effect of the mechanical structural parts, the surface may be subjected to alumite treatment. However, in the case of an aluminum alloy to which Pb or Bi is added, Pb is added to the surface.
Oxide film is not formed where Bi and Bi are exposed,
There is a problem that only an alumite film having a non-uniform and dull luster can be obtained.
【０００４】[0004]
【発明が解決しようとする課題】そこで、従来切削性を
向上させる目的で添加されていたＰｂ、Ｂｉ、Ｓｎなど
の低融点金属を添加せずに切削性を高めたＡｌ−Ｍｇ−
Ｓｉ系アルミニウム合金押出材の開発が進められ、それ
は、例えば特開平９−２４９９３１号公報、特開平１０
−８１７５号公報、特開平１１−１８９８３７号公報、
特開平１１−３２３４７２号公報等に開示されている。
本発明もその延長上に位置するものであり、切削性に優
れた、切削用Ａｌ−Ｍｇ−Ｓｉ系アルミニウム合金押出
材を得ることを目的とする。Therefore, Al-Mg- alloys having improved machinability without adding low melting point metals such as Pb, Bi and Sn which have been conventionally added for the purpose of improving machinability.
The development of extruded Si-based aluminum alloys has been promoted, for example, in Japanese Patent Application Laid-Open Nos.
-8175, JP-A-11-189837,
It is disclosed in JP-A-11-323472 and the like.
The present invention is also an extension of the present invention, and has an object to obtain an Al-Mg-Si-based aluminum alloy extruded material for cutting having excellent machinability.
【０００５】[0005]
【課題を解決するための手段】上記公報に記載された発
明は、Ａｌ−Ｍｇ−Ｓｉ系アルミニウム合金押出材の切
削性と組成及び析出組織の関係を調べ、優れた切削性を
示す範囲を特定したものであるが、本発明者らは、実用
的な押出性及び機械的性質を示す組成のＡｌ−Ｍｇ−Ｓ
ｉ系アルミニウム合金押出材について、その切削性を詳
しく調査する過程で、シャルピー衝撃値と切削性に一定
の関係があることを見いだした。さらに、その後の研究
により、破壊靭性値（Ｋｃ）と切削性に一定の関係があ
ることを見いだした。本発明は、これらの知見に基づい
てなされたものである。すなわち、本発明に係る切削用
Ａｌ−Ｍｇ−Ｓｉ系アルミニウム合金押出材は、Ｓｉ：
１．５〜７．０％、Ｍｇ：０．５〜１．０％を含有し、
シャルピー衝撃値が６．０〜９．５Ｎ・ｍ／ｃｍ２であ
ることを特徴とする。また、本発明に係る切削用Ａｌ−
Ｍｇ−Ｓｉ系アルミニウム合金押出材は、Ｓｉ：１．５
〜７．０％、Ｍｇ：０．５〜１．０％を含有し、破壊靭
性値（Ｋｃ）が２８〜４０ＭＰａ・ｍ１／２であること
を特徴とする。SUMMARY OF THE INVENTION The invention described in the above publication examines the relationship between the machinability, composition and precipitation structure of an extruded Al-Mg-Si-based aluminum alloy, and specifies the range showing excellent machinability. However, the present inventors have found that Al-Mg-S having a composition exhibiting practical extrudability and mechanical properties.
In the process of investigating the machinability of an i-type aluminum alloy extruded material, it was found that there was a certain relationship between the Charpy impact value and the machinability. Furthermore, subsequent studies have found that there is a certain relationship between the fracture toughness value (Kc) and the machinability. The present invention has been made based on these findings. That is, the extruded Al-Mg-Si-based aluminum alloy material for cutting according to the present invention comprises Si:
Containing 1.5 to 7.0%, Mg: 0.5 to 1.0%,
It has a Charpy impact value of 6.0 to 9.5 N · m / cm 2 . Further, the cutting Al-
The extruded material of the Mg-Si based aluminum alloy has a Si content of 1.5
７7.0%, Mg: 0.5-1.0%, and a fracture toughness (Kc) of 28-40 MPa · m 1/2 .
【０００６】[0006]
【発明の実施の形態】上記Ａｌ−Ｍｇ−Ｓｉ系アルミニ
ウム合金は、基本的に上記範囲のＳｉ、Ｍｇ及び残部Ａ
ｌと不純物からなり、必要に応じてさらに、Ｃｕ：
０．１〜１．０％、Ｍｎ、Ｃｒ、Ｚｒの１種又は２種
以上を各々０．０５〜０．５％、Ｔｉ：０．０１〜
０．１％、以上〜を単独又は２以上の適宜の組み合
わせで含み得る。本発明における組成範囲の限定理由は
次の通りである。BEST MODE FOR CARRYING OUT THE INVENTION The above Al-Mg-Si based aluminum alloy is basically composed of Si, Mg and the balance A in the above range.
1 and impurities, and further, if necessary, Cu:
0.1 to 1.0%, 0.05 to 0.5% each of one or more of Mn, Cr, and Zr, Ti: 0.01 to
0.1% or more may be contained alone or in an appropriate combination of two or more. The reasons for limiting the composition range in the present invention are as follows.
【０００７】Ｓｉ、Ｍｇ ＳｉとＭｇは共存することによりＭｇ２Ｓｉとして析出
し、強度を高める効果がある。しかし、Ｓｉが１．５％
未満又はＭｇが０．５％未満ではその効果が得られず、
一方、Ｓｉが７％を越えるとＳｉ系化合物の生成により
押出性が低下し、Ｍｇが１．０％を越えるとＭｇ単体の
固溶強化により変形抵抗が増加し、同じく押出性が低下
する。従って、Ｓｉの添加量は１．５〜７．０％、Ｍｇ
の添加量は０．５〜１．０％の範囲とする。Ｓｉのより
望ましい範囲は１．７〜５．０％、さらに望ましくは
１．７〜３．５％であり、Ｍｇのより望ましい範囲は
０．６〜０．８％である。Si, Mg Si and Mg coexist and precipitate as Mg 2 Si, which has the effect of increasing the strength. However, 1.5% of Si
Less than or less than 0.5% of Mg, the effect is not obtained,
On the other hand, when Si exceeds 7%, extrudability decreases due to generation of a Si-based compound, and when Mg exceeds 1.0%, deformation resistance increases due to solid solution strengthening of Mg alone, and extrudability also decreases. Therefore, the addition amount of Si is 1.5-7.0%,
Is in the range of 0.5 to 1.0%. The more desirable range of Si is 1.7 to 5.0%, more desirably 1.7 to 3.5%, and the more desirable range of Mg is 0.6 to 0.8%.
【０００８】Ｃｕ Ｃｕは熱処理により強度を高める効果があり必要に応じ
て添加されるが、０．１％未満ではその効果に乏しく、
一方、１．０％を越えて添加すると耐食性が低下し、ま
た押出性も低下する。従って、Ｃｕの添加量は０．１〜
１．０％の範囲とする。より望ましくは０．２〜０．８
％の範囲である。 Ｍｎ、Ｃｒ、Ｚｒ Ｍｎ、Ｃｒ、Ｚｒはそれぞれ固溶体化して素材の強度を
高める効果があり、１種又は２種以上が必要に応じて添
加されるが、それぞれ０．０５％未満では充分な効果が
得られず、一方、０．５％を越えて添加しても効果が飽
和し、押出性も低下する。従って、各元素の添加量はそ
れぞれ０．０５〜０．５％の範囲とする。より望ましく
はそれぞれ０．１５〜０．３５％の範囲である。[0008] Cu Cu has the effect of increasing the strength by heat treatment and is added as necessary. However, if less than 0.1%, the effect is poor.
On the other hand, if it is added in excess of 1.0%, the corrosion resistance decreases and the extrudability also decreases. Therefore, the addition amount of Cu is 0.1 to
The range is 1.0%. More preferably 0.2-0.8
% Range. Mn, Cr, Zr Mn, Cr, and Zr each have the effect of forming a solid solution to increase the strength of the material, and one or more of them are added as needed. On the other hand, the effect is saturated and the extrudability is reduced even if it is added in excess of 0.5%. Therefore, the added amount of each element is in the range of 0.05 to 0.5%. More preferably, they are in the range of 0.15 to 0.35%, respectively.
【０００９】Ｔｉ Ｔｉは鋳造組織を微細化して機械的性質を安定化するた
め、必要に応じて添加されるが、０．０１％未満ではそ
の効果が得られず、一方、０．１％を越えて添加しても
それ以上微細化効果は向上しない。従って、Ｔｉの添加
量は０．０１〜０．１％の範囲とする。 不純物 不純物のうちＦｅはアルミニウム合金に最も多く含まれ
る不純物であり、０．３５％を超えて前記アルミニウム
合金中に存在すると粗大な金属間化合物を晶出し、合金
の機械的性質を損なう。従って、Ｆｅの含有量は０．３
５％以下に規制する。また、アルミニウム合金を鋳造す
る際には地金、添加元素の中間合金等様々な経路より不
純物が混入する。混入する元素は様々であるが、Ｆｅ以
外の不純物は単体で０．０５％以下、総量で０．１５％
以下であれば前記アルミニウム合金の特性にほとんど影
響を及ぼさない。従って、これらの不純物は単体で０．
０５％以下、総量で０．１５％以下とする。なお、不純
物のうちＢについては、Ｔｉの添加に伴い合金中にＴｉ
の１／５程度の量で混入するが、より望ましい範囲は
０．０２％以下、さらに０．０１％以下が望ましい。Ti Ti is added as necessary to refine the cast structure and stabilize the mechanical properties, but if less than 0.01%, the effect cannot be obtained. If added in excess, the effect of miniaturization will not be further improved. Therefore, the addition amount of Ti is set in the range of 0.01 to 0.1%. Impurities Among impurities, Fe is the most contained impurity in the aluminum alloy, and if it exceeds 0.35% in the aluminum alloy, coarse intermetallic compounds are crystallized and the mechanical properties of the alloy are impaired. Therefore, the content of Fe is 0.3
Restrict to 5% or less. Further, when casting an aluminum alloy, impurities are mixed from various routes such as a base metal and an intermediate alloy of an additive element. The elements to be mixed are various, but impurities other than Fe are 0.05% or less in a simple substance, and 0.15% in total amount.
If it is below, it hardly affects the characteristics of the aluminum alloy. Therefore, these impurities alone are 0.1.
05% or less, and the total amount is 0.15% or less. As for B among impurities, Ti is added to the alloy with the addition of Ti.
Is mixed in an amount of about 1/5, but a more preferable range is 0.02% or less, and further preferably 0.01% or less.
【００１０】シャルピー衝撃値 切削現象は、被削材が工具より受ける高速変形現象と考
えることができる。一方、シャルピー衝撃値は、工具よ
りの切削変形に対する切りくず破断の抵抗力を示し、こ
の値が低い方が切削歪が集中し切りくず分断性が向上す
る。そこで、本発明では、前記組成を有するアルミニウ
ム合金押出材において、シャルピー衝撃値を９．５Ｎ・
ｍ／ｃｍ２以下と規定した。この値が９．５Ｎ・ｍ／ｃ
ｍ２を越えるようであると切削性が劣る。一方、シャル
ピー値が低すぎると構造材料としての信頼性に欠けるこ
とになるので、シャルピー値は６．０〜９．５Ｎ・ｍ／
ｃｍ２の範囲とする。[0010] The Charpy impact value cutting phenomenon can be considered as a high-speed deformation phenomenon in which a workpiece is received from a tool. On the other hand, the Charpy impact value indicates the chip breaking resistance to cutting deformation from the tool. The lower this value is, the more concentrated the cutting strain is, and the better the chip breaking property is. Therefore, in the present invention, in the extruded aluminum alloy having the above composition, the Charpy impact value is set to 9.5 N ·
m / cm 2 or less. This value is 9.5 Nm / c
machinability and is exceeding m 2 poor. On the other hand, if the Charpy value is too low, the reliability as a structural material will be lacking, so the Charpy value is 6.0 to 9.5 N · m /.
cm 2 .
【００１１】破壊靭性値（Ｋｃ） 破壊靭性値（Ｋｃ）は、工具による切削変形において切
りくずのき裂の伝幡に対する抵抗力を示し、この値が低
い方が切りくずのき裂が伝播し切りくず分断性が向上す
る。そこで、本発明では、前記組成を有するアルミニウ
ム合金押出材において、破壊靭性値を４０ＭＰａ・ｍ
１／２以下と規定した。この値が４０ＭＰａ・ｍ１／２
を越えるようであると切削性が劣る。一方、破壊靭性値
が低すぎると構造材料としての信頼性に欠けることにな
るので、破壊靭性値は２８〜４０ＭＰａ・ｍ１／２の範
囲とする。望ましくは３０〜３８ＭＰａ・ｍ１／２、よ
り望ましくは３５〜３８ＭＰａ・ｍ１／２の範囲であ
る。なお、本発明では破壊靭性値（Ｋｃ）は、切欠き強
度比（ＮＴＲ）を用い、下記式（１）により計算した
（「革新航空宇宙技術開発に関する研究調査」日本航空
宇宙工業会，702(1983),149.参照）。ただし、ＮＴＲは
切欠きを形成した試験片（後述する実施例参照）の引張
強度と形成していない試験片の耐力の比を表す。 Ｋｃ＝３３×ＮＴＲ−１６ ・・・・（１）Fracture toughness (Kc) Fracture toughness (Kc) indicates the resistance of a chip to the propagation of cracks during cutting deformation with a tool. Chip breaking performance is improved. Therefore, in the present invention, in the extruded aluminum alloy having the above composition, the fracture toughness value is set to 40 MPa · m.
It was specified as 1/2 or less. This value is 40 MPa · m 1/2
If it exceeds, the machinability is inferior. On the other hand, if the fracture toughness value is too low, the reliability as a structural material will be lacking, so the fracture toughness value is in the range of 28 to 40 MPa · m 1/2 . It is preferably in the range of 30 to 38 MPa · m 1/2 , more preferably in the range of 35 to 38 MPa · m 1/2 . In the present invention, the fracture toughness value (Kc) is calculated using the notch strength ratio (NTR) according to the following formula (1) ("Research and investigation on the development of innovative aerospace technology" Japan Aerospace Industry Association, 702 ( 1983), 149.). Here, NTR represents the ratio of the tensile strength of the notched test piece (see Examples described later) to the proof stress of the not-formed test piece. Kc = 33 × NTR-16 (1)
【００１２】[0012]
【実施例】以下、本発明の実施例について、比較例と比
較して具体的に説明する。 （実施例１）表１に示した化学組成の合金を溶解し半連
続鋳造により１６０ｍｍ径の押出ビレットを作成し、４
７０℃で４時間均質化熱処理を施した後、５００℃の押
出温度でφ３０ｍｍ径に押し出し、押出中に押出材を水
冷することにより焼入れを行った（プレス焼入れ）。焼
入れ後の各押出材に対し室温×７ｄａｙｓの室温時効、
及び１９０℃×４ｈｒ、１６０℃×６ｈｒ、２３０℃×
４ｈｒ、３００℃×４ｈｒの人工時効処理を行った。こ
れを供試材とし、引張特性、シャルピー衝撃値及び切削
性を下記要領で測定した。また、押出性をみるため上記
押出では押出荷重を一定（６００トン）とし、その押出
速度（押出材が出てくるときの速度）を計測し、各押出
材の押出性を下記の要領で評価し、その結果を表２に示
す。EXAMPLES Examples of the present invention will be specifically described below in comparison with comparative examples. (Example 1) An alloy having a chemical composition shown in Table 1 was melted, and an extruded billet having a diameter of 160 mm was prepared by semi-continuous casting.
After a homogenizing heat treatment at 70 ° C. for 4 hours, the extruded material was extruded to a diameter of φ30 mm at an extrusion temperature of 500 ° C., and the extruded material was quenched by water cooling during extrusion (press quenching). Room temperature aging of room temperature x 7 days for each extruded material after quenching,
And 190 ° C × 4hr, 160 ° C × 6hr, 230 ° C ×
The artificial aging treatment was performed at 300 ° C. × 4 hr for 4 hr. Using this as a test material, tensile properties, Charpy impact value, and machinability were measured in the following manner. In order to check the extrudability, in the above extrusion, the extrusion load was kept constant (600 tons), the extrusion speed (speed at which the extruded material came out) was measured, and the extrudability of each extruded material was evaluated in the following manner. The results are shown in Table 2.
【００１３】[0013]
【表１】 [Table 1]
【００１４】引張特性；押出方向に採取したＪＩＳ４号
引張試験片を用い、ＪＩＳＺ２２４１に規定する金属材
料試験方法に準じ、引張強さ、耐力、及び伸びを測定し
た。 シャルピー衝撃値；押出方向に採取したＪＩＳ４号衝撃
試験片を用い、ＪＩＳＺ２２４２に規定する金属材料衝
撃試験方法に準じ、シャルピー衝撃値を測定した。 切削性；市販の高速度鋼製の４ｍｍ径ドリルを用い、回
転数１５００ｒｐｍ、送り速度３００ｍｍ／分の条件に
て切削し、ドリルへの巻き付き発生の有無を観察すると
ともに、切り屑分断性を調べるために切り屑１００ｇ当
りの切り屑個数を測定した。 押出性；押出速度の値が５ｍ／分より大のとき◎（優れ
ている）、２〜５ｍ／分のとき○（使用可能である）、
１〜２ｍ／分のとき△（やや劣る）、１ｍ／分より小の
とき×（使用に耐えない）と評価した。Tensile properties: Tensile strength, proof stress, and elongation were measured using a JIS No. 4 tensile test specimen sampled in the extrusion direction according to the metal material test method specified in JISZ2241. Charpy impact value: Using a JIS No. 4 impact test piece sampled in the extrusion direction, the Charpy impact value was measured according to the metal material impact test method specified in JISZ2242. Machinability: Using a commercially available high-speed steel 4 mm diameter drill, cut at 1500 rpm and feed rate of 300 mm / min, observe the occurrence of wrapping around the drill, and examine the chip breaking ability. For this purpose, the number of chips per 100 g of chips was measured. Extrudability: when the value of the extrusion speed is more than 5 m / min, ◎ (excellent), when 2 to 5 m / min, ○ (usable),
When it was 1-2 m / min, it was evaluated as △ (somewhat inferior), when it was smaller than 1 m / min, x (not usable).
【００１５】[0015]
【表２】 [Table 2]
【００１６】合金組成及びシャルピー衝撃値が本発明の
規定の範囲内であるＮｏ．１〜１１は、いずれも優れた
機械的性質及び切削性を示す。また、押出材にはむしれ
や焼き付き痕はなく表面性状は良好で、押出性も優れて
いる。これに対し、Ｎｏ．１２〜２１は組成が本発明の
範囲外又は熱処理が不適切であるため、いずれも何らか
の特性がＮｏ．１〜１１に比べ劣っている。すなわち、
Ｎｏ．１２、１４〜１９はシャルピー衝撃値が９．５Ｎ
・ｍ／ｃｍ２を越えるため切り屑質量１００ｇ当りの個
数が少なく（３０００個以下；切り屑１つ当りの質量が
大きい）、ドリルへの巻付きが起こった。また、Ｎｏ．
１３は押出性が悪く伸びが劣り、Ｎｏ．２０、２１も伸
びが劣る。なお、表２のシャルピー衝撃値と切削性（切
り屑個数及び巻き付き）の関係を図１に示す。図１をみ
ると、シャルピー衝撃値９．５Ｎ・ｍ／ｃｍ２以下の範
囲で切削性が優れている。The alloy No. and the Charpy impact value within the ranges specified in the present invention were used. Nos. 1 to 11 show excellent mechanical properties and machinability. In addition, the extruded material has no surface peeling or burning marks, has good surface properties, and has excellent extrudability. On the other hand, no. Nos. 12 to 21 have a composition out of the range of the present invention or an inappropriate heat treatment. Inferior to 1 to 11. That is,
No. 12, 14-19 have a Charpy impact value of 9.5N
・ Because it exceeded m / cm 2 , the number per 100 g of chip mass was small (3000 or less; the mass per chip was large), and winding around the drill occurred. In addition, No.
No. 13 has poor extrudability and poor elongation. 20 and 21 also have poor elongation. FIG. 1 shows the relationship between the Charpy impact value in Table 2 and the machinability (number of chips and winding). Referring to FIG. 1, the cuttability is excellent in a Charpy impact value of 9.5 N · m / cm 2 or less.
【００１７】（実施例２）表１のＮｏ．１〜３及び５〜
１１の時効処理後の押出材について、図２に示す形状の
引張試験片（切欠き加工あり）を押出方向に平行に採取
し、標点間距離５０ｍｍ、公称歪み速度１．７×１０
−３ｓｅｃ−１、室温で引張試験を行った。続いて、そ
の引張強度と表２の耐力（σ0.2）の比から切欠き強度
比（ＮＴＲ）を求め、前記（１）式により破壊靭性値
（Ｋｃ）を求めた。また、表３に示す化学組成の合金に
ついて、実施例１と同じ条件で押出材を製造し、各押出
材に対し１７０℃×８ｈｒ、１７０℃×６ｈｒ及び１９
０℃×４ｈｒの人工時効処理を行った。これを供試材と
し、実施例１と同じ方法で引張特性及び切削性を測定し
た。同じく押出性も実施例１と同じ方法で評価した。さ
らに、破壊靭性値（Ｋｃ）を前記と同じ方法で求めた。
以上の結果を表４に示す。(Embodiment 2) 1-3 and 5-
With respect to the extruded material after the aging treatment of No. 11, a tensile test piece (notched) having a shape shown in FIG. 2 was sampled in parallel with the extrusion direction, the distance between gauge points was 50 mm, and the nominal strain rate was 1.7 × 10.
A tensile test was performed at −3 sec −1 at room temperature. Subsequently, the notch strength ratio (NTR) was determined from the ratio of the tensile strength to the proof stress (σ0.2) in Table 2, and the fracture toughness value (Kc) was determined by the above equation (1). Extruded materials were manufactured under the same conditions as in Example 1 for alloys having the chemical compositions shown in Table 3, and each extruded material was 170 ° C. × 8 hours, 170 ° C. × 6 hours, and
An artificial aging treatment at 0 ° C. × 4 hr was performed. Using this as a test material, tensile properties and machinability were measured in the same manner as in Example 1. Similarly, the extrudability was evaluated in the same manner as in Example 1. Further, the fracture toughness value (Kc) was determined by the same method as described above.
Table 4 shows the above results.
【００１８】[0018]
【表３】 [Table 3]
【００１９】[0019]
【表４】 [Table 4]
【００２０】表４に示すように、合金組成及び破壊靭性
値（Ｋｃ）が本発明の規定の範囲内であるＮｏ．１〜３
及び５〜１１は、いずれも優れた押出性、機械的性質及
び切削性を示す。これに対し、Ｎｏ．２２〜２９は組成
又は熱処理が不適切であるため、いずれも何らかの特性
がＮｏ．１〜３及び５〜１１に比べ劣っている。例え
ば、Ｎｏ．２３、２４は破壊靭性値（Ｋｃ）が４０ＭＰ
ａ・ｍ１／２を越えるため切り屑質量１００ｇ当りの個
数が少なく（３０００個以下）、ドリルへの巻付きが起
こった。また、Ｎｏ．２２は破壊靭性値（Ｋｃ）が２８
ＭＰａ・ｍ１／２に満たないため伸びが小さく、Ｎｏ．
２９はさらに押出性に劣る。As shown in Table 4, the alloy composition and the fracture toughness (Kc) were within the ranges specified in the present invention. 1-3
And 5 to 11 show excellent extrudability, mechanical properties and machinability. On the other hand, no. Nos. 22 to 29 have inadequate compositions or heat treatments, and all have some characteristics of No. 22 to 29. Inferior to 1-3 and 5-11. For example, no. 23 and 24 have a fracture toughness value (Kc) of 40 MP
Since it exceeds a · m 1/2 , the number of chips per 100 g of mass was small (3000 or less), and winding around the drill occurred. In addition, No. 22 has a fracture toughness value (Kc) of 28
No more than 1 MPa · m 1/2 , the elongation was small.
No. 29 is further inferior in extrudability.
【００２１】[0021]
【発明の効果】本発明によれば、切り屑分断性に優れ、
切り屑のドリルへの巻き付きが防止される切削用Ａｌ−
Ｍｇ−Ｓｉ系アルミニウム合金押出材を得ることができ
る。この切削用Ａｌ−Ｍｇ−Ｓｉ系アルミニウム合金押
出材は、ＡＢＳのハウジンブやピストン、コンプレッサ
ー用バルブやトルクコンバーターバルブ等のバルブ類、
ハードディスク用モーターハブ、オーディオ部品のボリ
ューム軸、ブレーキホイールシリンダーやクラッチマス
ターシリンダー等のシリンダー類、カメラや顕微鏡の筒
材のような光学機器、その他の機械部品などに好適であ
る。According to the present invention, excellent chip breaking performance is achieved.
Al- for cutting that prevents swarf from wrapping around the drill
An extruded Mg-Si-based aluminum alloy can be obtained. This extruded Al-Mg-Si aluminum alloy for cutting is used for ABS housings and pistons, valves such as compressor valves and torque converter valves,
It is suitable for motor hubs for hard disks, volume shafts for audio components, cylinders such as brake wheel cylinders and clutch master cylinders, optical devices such as cameras and microscope cylinders, and other mechanical components.
【図１】 シャルピー衝撃値と切削性の関係を示す図で
ある。FIG. 1 is a diagram showing a relationship between a Charpy impact value and machinability.
【図２】 切欠き加工をした引張試験片の形状を示す図
である。FIG. 2 is a view showing a shape of a notched tensile test specimen.
Claims (3)
同じ）、Ｍｇ：０．５〜１．０％を含有し、シャルピー
衝撃値が６．０〜９．５Ｎ・ｍ／ｃｍ２であることを特
徴とする切削用Ａｌ−Ｍｇ−Ｓｉ系アルミニウム合金押
出材。1. A steel containing 1.5 to 7.0% (mass%, hereinafter the same) of Si and 0.5 to 1.0% of Mg and having a Charpy impact value of 6.0 to 9.5 Nm. / Cm 2 , wherein the extruded material is an Al-Mg-Si-based aluminum alloy for cutting.
〜１．０％を含有し、破壊靭性値（Ｋｃ）が２８〜４０
ＭＰａ・ｍ１／２であることを特徴とする切削用Ａｌ−
Ｍｇ−Ｓｉ系アルミニウム合金押出材。2. Si: 1.5 to 7.0%, Mg: 0.5
１．０1.0%, and the fracture toughness value (Kc) is 28-40.
MPa-m 1/2 , characterized by cutting Al-
Extruded material of Mg-Si based aluminum alloy.
特徴とする請求項１又は２に記載された切削用Ａｌ−Ｍ
ｇ−Ｓｉ系アルミニウム合金押出材。3. The Al-M for cutting according to claim 1, which contains 0.1 to 1.0% of Cu.
Extruded g-Si aluminum alloy.
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| JP2000309943A JP3886329B2 (en) | 2000-05-26 | 2000-10-10 | Al-Mg-Si aluminum alloy extruded material for cutting |
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| JP2000-156119 | 2000-05-26 | ||
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