JPH08225903A - Production of high-pressure cast aluminum alloy casting - Google Patents
Production of high-pressure cast aluminum alloy castingInfo
- Publication number
- JPH08225903A JPH08225903A JP3263795A JP3263795A JPH08225903A JP H08225903 A JPH08225903 A JP H08225903A JP 3263795 A JP3263795 A JP 3263795A JP 3263795 A JP3263795 A JP 3263795A JP H08225903 A JPH08225903 A JP H08225903A
- Authority
- JP
- Japan
- Prior art keywords
- casting
- solidification
- aluminum alloy
- cooling rate
- completion
- 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
Landscapes
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、高圧アルミニウム合金
鋳物の製造方法に係り、特に十分な機械的性質を保有
し、かつ、熱処理コストの低減を意図した高圧アルミニ
ウム合金鋳造の製造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a high-pressure aluminum alloy casting, and more particularly to a method for producing a high-pressure aluminum alloy casting which has sufficient mechanical properties and is intended to reduce heat treatment cost. is there.
【0002】[0002]
【従来の技術】自動車部品においては、ホイールや足回
り部品などは従来鉄系材料が使用されていたが近年にな
って軽量化の要求に応えるため次第にアルミニウム合金
鋳物が使用されるようになってきた。高圧鋳造法は強度
部材の製造方法として、生産性ならびに製品品質の高さ
の両面から適しているが、必要な機械的性質を得るため
には、T4処理、T6処理といった煩雑な高温熱処理が
不可欠とされていた。2. Description of the Related Art In automobile parts, iron-based materials have been conventionally used for wheels and underbody parts, but in recent years, aluminum alloy castings have been gradually used to meet the demand for weight reduction. It was The high-pressure casting method is suitable as a method for manufacturing strength members in terms of both productivity and high product quality, but in order to obtain the required mechanical properties, complicated high-temperature heat treatment such as T4 treatment and T6 treatment is essential. Was said.
【0003】[0003]
【発明が解決しようとする課題】従来の高圧鋳造による
アルミニウム合金鋳物の製造方法では、鋳造完了後に製
品を金型内部より取り出し、トリミングや品質検査など
の次工程に支障のないようにある程度の温度まで冷却さ
れる。その後、熱処理工程において、合金添加成分をマ
トリックスに溶け込ませる溶体化処理のために773K
を越える高温まで再加熱され、所定時間保持された後水
中へ焼入れし急冷される。必要に応じてさらに溶質元素
を析出させる焼戻し処理が施行される。この溶体化処理
のために、工程がひとつ増え、専用の高温熱処理設備が
必要となり、エネルギコストもそれだけ大きくなる。ま
た、鋳物内部に鋳造過程で巻き込まれた空気などのガス
欠陥が存在すると、溶体化処理時の高温によりガスが膨
張し製品が軟化するため、製品表面に膨れが生じる。溶
体化処理を施す製品はこのようなガス欠陥を含まないよ
うに、真空鋳造法あるいは低速充填法のような特別な製
造法により慎重に鋳造する必要がある。In the conventional method for producing an aluminum alloy casting by high pressure casting, after the casting is completed, the product is taken out from the inside of the mold, and a certain temperature is set so as not to hinder the subsequent steps such as trimming and quality inspection. Is cooled down. After that, in the heat treatment process, 773K for solution treatment to dissolve the alloy additive component into the matrix.
It is re-heated to a high temperature exceeding 100 ° C., held for a predetermined time, quenched in water and then rapidly cooled. If necessary, a tempering process for precipitating solute elements is performed. For this solution treatment, the number of processes is increased by one, special high temperature heat treatment equipment is required, and the energy cost is increased accordingly. Further, if there is a gas defect such as air trapped inside the casting during the casting process, the gas expands due to the high temperature during the solution treatment and the product softens, so that the product surface swells. The solution-treated product must be carefully cast by a special manufacturing method such as a vacuum casting method or a slow filling method so as not to contain such a gas defect.
【0004】[0004]
【課題を解決するための手段】以上の課題を解決して、
十分な機械的性質を保有する高圧鋳造アルミニウム合金
鋳物を溶体化処理工程を省略して得るために、本発明に
おいては、アルミニウム合金の溶湯を49MPa以上の
鋳込圧力で金型内に加圧充填して凝固させ、凝固完了後
に金型より取り出して直ちに水に浸漬して焼入れを施す
高圧鋳造アルミニウム合金鋳物の製造方法であって、焼
入れ時の製品温度T(K)は凝固区間平均冷却速度をR
(K/s)とした場合にT>823−166 logR
で示される条件を満足するよう保持され、かつ、該焼入
れ作業完了後に人工時効処理を実施することとした。ま
た、合金組成としては鋳造性がよく、機械的性質に優れ
るAl−Si−Mg系の熱処理型合金が特に適している
ことがわかった。また、伸び値を改善するためにNa、
Sr、Sbのうち少なくともひとつを改良元素として添
加することが有効であることもわかった。[Means for Solving the Problems] By solving the above problems,
In order to obtain a high-pressure cast aluminum alloy casting having sufficient mechanical properties by omitting the solution treatment step, in the present invention, a molten aluminum alloy is press-filled in a mold with a casting pressure of 49 MPa or more. In the method for producing a high-pressure cast aluminum alloy casting, which is immediately taken out of the mold after completion of the solidification and immediately immersed in water for quenching, the product temperature T (K) at the time of quenching is the average cooling rate of the solidification section. R
(K / s), T> 823-166 logR
It was decided that the artificial aging treatment should be carried out after the quenching work was completed while maintaining the condition shown by. It was also found that an Al—Si—Mg heat-treatable alloy, which has good castability and excellent mechanical properties, is particularly suitable as the alloy composition. Also, in order to improve the elongation value, Na,
It was also found that it is effective to add at least one of Sr and Sb as an improving element.
【0005】[0005]
【作用】アルミニウム合金鋳物を49MPa以上の鋳込
圧力で金型内に加圧充填して凝固させ、凝固完了後に金
型より取り出して、T>823−166 logR(た
だし、T(K):焼入れ時の製品温度、R(K/s):
凝固区間平均冷却速度)の条件を満足する状態で焼入れ
し、引き続き人工時効処理をすることにより、溶体化処
理をすることなく良好な機械的性質を有する高圧鋳造ア
ルミニウム合金鋳物が得られる。[Function] An aluminum alloy casting is pressure-filled in a mold with a casting pressure of 49 MPa or more to be solidified and taken out from the mold after completion of solidification, and T> 823-166 logR (where T (K): quenching Product temperature at time, R (K / s):
A high-pressure cast aluminum alloy casting having good mechanical properties can be obtained without solution treatment by quenching in a state satisfying the conditions of (solidifying section average cooling rate) and subsequently performing artificial aging treatment.
【0006】[0006]
【実施例】以下図面に基づいて本発明の実施例の詳細に
ついて説明する。図1は本発明の実施例に係る凝固区間
平均冷却速度と鋳造焼入れ温度との相関線図である。ま
ず、JIS AC4CHのアルミニウム合金を4種類の
溶湯処理したもの(すなわち、無処理、Na処理、Sr
処理、Sb処理)に分けてそれぞれ溶湯温度953K、
鋳込圧力85MPa、ゲート速度0.4m/sにて、外
形寸法0.1m×0.2m、厚さ0.006〜0.02
4mの階段状平板鋳物に鋳造し、凝固完了後に金型より
製品を取り出して直ちに333Kの温水中に焼入れた。
焼入れ温度は凝固完了後の金型内保持時間により調整し
た。焼入後さらに433K×7,200秒の焼戻しを施
した。階段状平板の各板厚中央部の凝固冷却曲線は、シ
ース熱電対を直接金型キャビティ内に挿入し測定した。
表1にこれらの試料の機械的性質の測定結果を示す。Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a correlation diagram of the solidification zone average cooling rate and the casting and quenching temperature according to the embodiment of the present invention. First, a JIS AC4CH aluminum alloy that has been subjected to four types of molten metal treatment (that is, untreated, Na-treated, Sr-treated).
Treatment, Sb treatment) and the melt temperature of 953K,
At a casting pressure of 85 MPa and a gate speed of 0.4 m / s, the outer dimensions are 0.1 m × 0.2 m and the thickness is 0.006 to 0.02.
It was cast into a 4 m step flat plate casting, and after solidification was completed, the product was taken out from the mold and immediately quenched in 333 K warm water.
The quenching temperature was adjusted by the holding time in the mold after completion of solidification. After quenching, tempering was further performed for 433K × 7,200 seconds. The solidification cooling curve of each plate thickness center part of the stepwise flat plate was measured by inserting the sheath thermocouple directly into the mold cavity.
Table 1 shows the measurement results of the mechanical properties of these samples.
【0007】[0007]
【表1】 [Table 1]
【0008】表1によれば、本発明例のものは、引張強
さがいずれも250MPa以上の十分な機械的性質を示
しているが、本発明の条件を満たしていない比較例29
〜31ではいずれも引張強さは250MPa以下であ
り、機械的性質が劣る。図1は、凝固区間平均冷却速度
と鋳造焼入れ温度との相関線図であり、図1中の□は本
発明例、×は比較例を示している。鋳造焼入れ温度が高
いほど、溶質元素の強制固溶量が多く焼入れ効果は大き
いが、高圧鋳造法の場合鋳物の温度低下が速いため、焼
入れ温度を高くすることは難しい。しかし、鋳込圧力が
高いほど金型と鋳物との接触が良好になるため、凝固区
間冷却速度および凝固後の冷却速度は大きくなる。その
結果、デンドライトなどの凝固組織が細かくなり、凝固
後の冷却過程での溶質元素の析出が抑制されるため固溶
量が多く、焼戻し処理による析出量が増える。上記のよ
うに、鋳造焼入れにおいては、焼入れ温度のみではなく
凝固冷却速度が大きく影響するため、鋭意検討の結果以
下のように条件を限定した。鋳込圧力を49MPa以上
としたのは、大きな凝固冷却速度で鋳込むことにより微
細組織とするためであり、また、特に低速充填での充填
不良、引け巣などの欠陥の発生を防止するためにも鋳込
圧力は高い方が良い。焼入れ温度は凝固冷却速度と関係
付けて検討され、凝固冷却速度が小さい場合には高温か
ら焼入れなくては十分な機械的性質を示さないが、凝固
冷却速度が大きい場合は低い焼入れ温度でも十分な機械
的性質を発揮することを見い出した。即ち、凝固区間平
均冷却速度R(K/s)と鋳造焼入れ温度T(K)が、
図1に示すように、According to Table 1, the examples of the present invention all have sufficient mechanical properties such that the tensile strength is 250 MPa or more, but the comparative example 29 does not satisfy the conditions of the present invention.
In all of Nos. 31 to 31, the tensile strength is 250 MPa or less, and the mechanical properties are poor. FIG. 1 is a correlation diagram of the solidification zone average cooling rate and the casting and quenching temperature. In FIG. 1, □ indicates an example of the present invention, and x indicates a comparative example. The higher the casting and quenching temperature, the greater the amount of solute element forced solid solution, and the greater the quenching effect. However, the higher the casting pressure is, the better the contact between the mold and the casting is, so that the cooling rate in the solidification section and the cooling rate after solidification are increased. As a result, the solidification structure such as dendrite becomes finer and the precipitation of solute elements in the cooling process after solidification is suppressed, so that the solid solution amount is large and the precipitation amount by the tempering process is increased. As described above, in the casting and quenching, not only the quenching temperature but also the solidification cooling rate has a great influence. Therefore, as a result of earnest study, the conditions were limited as follows. The casting pressure was set to 49 MPa or more in order to form a fine structure by casting at a high solidification cooling rate, and also to prevent the occurrence of defects such as poor filling and shrinkage cavities particularly at low speed filling. However, the higher the casting pressure, the better. The quenching temperature is studied in relation to the solidification cooling rate.When the solidification cooling rate is low, it does not show sufficient mechanical properties without quenching from a high temperature, but when the solidification cooling rate is high, a low quenching temperature is sufficient It has been found to exhibit mechanical properties. That is, the solidification zone average cooling rate R (K / s) and the casting and quenching temperature T (K) are
As shown in Figure 1,
【0009】T>823−166 logRT> 823-166 logR
【0010】で示される範囲に限定した。鋳造焼入れ後
に、従来と同様に人工時効処理を行う。また、合金組成
としては、鋳造性がよく機械的性質に優れる熱処理型合
金としてAC4CHなどのAl−Si−Mg系合金が好
適である。さらに、Al−Si−Mg系合金では共晶S
iの形態が機械的性質、特に伸び値に大きく影響する
が、溶体化処理を施した場合、鋳造のままでは針状の共
晶Siが球状化(改良)されるのに対し、本製造法の場
合は溶体化処理をしないため、球状化が起こらず伸び値
が小さい傾向がある。そこで、共晶Si形態改良元素で
あるNa、Sr、Sbのうち少なくても1成分を添加し
共晶Siの形態を改良することが、良好な機械的性質を
得るために有効である。It is limited to the range shown by. After casting and quenching, artificial aging treatment is performed as in the conventional case. As the alloy composition, an Al—Si—Mg-based alloy such as AC4CH is suitable as a heat treatment type alloy having good castability and excellent mechanical properties. Further, in the Al-Si-Mg system alloy, eutectic S
Although the morphology of i greatly affects the mechanical properties, especially the elongation value, when solution treatment is applied, the needle-shaped eutectic Si is spheroidized (improved) in the as-cast state. In the case of No. 3, since solution treatment is not performed, spheroidization does not occur and the elongation value tends to be small. Therefore, it is effective to improve the morphology of eutectic Si by adding at least one of Na, Sr, and Sb which are eutectic Si morphology improving elements to obtain good mechanical properties.
【0011】[0011]
【発明の効果】以上説明したように、本発明の高圧鋳造
アルミニウム合金鋳物の製造方法によれば、加圧鋳造後
に煩雑な溶体化処理を行うことなく高い機械的性質を有
する高品位の鋳造鋳物を得ることができる。As described above, according to the method for producing a high-pressure cast aluminum alloy casting of the present invention, a high-quality cast casting having high mechanical properties without complicated solution treatment after pressure casting. Can be obtained.
【図1】本発明の実施例に係る凝固区間平均冷却速度と
鋳造焼入れ温度との相関線図である。FIG. 1 is a correlation diagram of a solidification zone average cooling rate and a casting and quenching temperature according to an example of the present invention.
R 凝固区間平均冷却速度 T 鋳造焼入れ温度 R Solidification zone average cooling rate T Casting quenching temperature
Claims (3)
上の鋳込圧力で金型内に加圧充填して凝固させ、凝固完
了後に金型より取り出して直ちに水に浸漬して焼入れを
施す高圧鋳造アルミニウム合金鋳物の製造方法であっ
て、焼入れ時の製品温度T(K)は凝固区間平均冷却速
度をR(K/s)とした場合にT>823−166 l
ogRで示される条件を満足するよう保持され、かつ、
該焼入れ作業完了後に人工時効処理を実施する高圧鋳造
アルミニウム合金鋳物の製造方法。1. A high-pressure cast aluminum alloy in which a molten aluminum alloy is pressurized and filled in a mold at a casting pressure of 49 MPa or more to be solidified, taken out from the mold after completion of solidification and immediately immersed in water for quenching. A casting manufacturing method, wherein the product temperature T (K) during quenching is T> 823-166 l when the solidification section average cooling rate is R (K / s).
is held to satisfy the condition indicated by ogR, and
A method for producing a high-pressure cast aluminum alloy casting, which comprises performing artificial aging treatment after completion of the quenching work.
合金であることを特徴とする請求項1記載の高圧鋳造ア
ルミニウム合金鋳物の製造方法。2. The method for producing a high pressure cast aluminum alloy casting according to claim 1, wherein the aluminum alloy is an Al—Si—Mg type alloy.
分が添加されていることを特徴とする請求項2記載の高
圧鋳造アルミニウム合金鋳物の製造方法。3. The method for producing a high pressure cast aluminum alloy casting according to claim 2, wherein at least one component of Na, Sr and Sb is added.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3263795A JPH08225903A (en) | 1995-02-21 | 1995-02-21 | Production of high-pressure cast aluminum alloy casting |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3263795A JPH08225903A (en) | 1995-02-21 | 1995-02-21 | Production of high-pressure cast aluminum alloy casting |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH08225903A true JPH08225903A (en) | 1996-09-03 |
Family
ID=12364377
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3263795A Pending JPH08225903A (en) | 1995-02-21 | 1995-02-21 | Production of high-pressure cast aluminum alloy casting |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH08225903A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100381230C (en) * | 2003-11-19 | 2008-04-16 | 马自达汽车株式会社 | Method for producing light-alloy casting |
WO2012028954A1 (en) | 2010-08-31 | 2012-03-08 | Toyota Jidosha Kabushiki Kaisha | Method of casting light alloy and casting |
CN104619442A (en) * | 2012-09-18 | 2015-05-13 | 马自达汽车株式会社 | Cooling method and cooling device for Al alloy manufactured casting |
-
1995
- 1995-02-21 JP JP3263795A patent/JPH08225903A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100381230C (en) * | 2003-11-19 | 2008-04-16 | 马自达汽车株式会社 | Method for producing light-alloy casting |
WO2012028954A1 (en) | 2010-08-31 | 2012-03-08 | Toyota Jidosha Kabushiki Kaisha | Method of casting light alloy and casting |
CN104619442A (en) * | 2012-09-18 | 2015-05-13 | 马自达汽车株式会社 | Cooling method and cooling device for Al alloy manufactured casting |
US10000835B2 (en) | 2012-09-18 | 2018-06-19 | Mazda Motor Corporation | Cooling method and cooling device for Al alloy manufactured casting |
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