JP2000355206A - Suspension member for automobile - Google Patents
Suspension member for automobileInfo
- Publication number
- JP2000355206A JP2000355206A JP11166816A JP16681699A JP2000355206A JP 2000355206 A JP2000355206 A JP 2000355206A JP 11166816 A JP11166816 A JP 11166816A JP 16681699 A JP16681699 A JP 16681699A JP 2000355206 A JP2000355206 A JP 2000355206A
- Authority
- JP
- Japan
- Prior art keywords
- suspension member
- molten metal
- semi
- rib
- thickness
- 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.)
- Granted
Links
Landscapes
- Vehicle Body Suspensions (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、半凝固ダイカスト
鋳造法により鋳造されたアルミニウム合金製自動車用サ
スペンション部材に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aluminum alloy automobile suspension member cast by a semi-solid die casting method.
【０００２】[0002]
【従来の技術】自動車用サスペンション部材の多くは鉄
系材料を用いて板金加工（含プレス）、鍛造又は鋳造に
より製造されている。鉄系材料が選択されるのはその強
度、靭性に優れる点によるところが大きい。近年、地球
温暖化防止策の一つとして自動車の低燃費、排ガスのク
リーン化が叫ばれているが、燃費効率の向上という観点
から車両重量の低減、特に乗り心地、車両運動性能の向
上と言った点も満足するように考えればサスペンション
部材の軽量化は最も効果的な手法である。サスペンショ
ン部材の軽量化のために、材質の転換すなわち鉄合金か
らアルミニウム合金への変換が最も現実的な選択として
考えられる。自動車用部品をアルミニウム合金よりも比
強度の高いマグネシウム合金で製造することもあるが、
この合金は疲労強度の問題から、サスペンション部材の
ようにくり返し荷重を受ける部材への適用は困難であ
る。サスペンション部材の軽量化を図る手段として機能
上支障のない範囲で薄肉化することも考えられるが、特
に鋳造や鍛造では製造上の困難さを伴う。具体的には大
幅な薄肉化が困難な場合があったり、加工による肉盗み
ではコストが大幅に上昇し、かつ形状が制限されてしま
うことなどである。そこで従来の鋳造法では極めて困難
であった高信頼性を得るために、半凝固ダイカスト鋳造
法を適用することが考えられる。2. Description of the Related Art Many suspension members for automobiles are manufactured by sheet metal working (including press), forging or casting using an iron-based material. The choice of an iron-based material largely depends on its strength and toughness. In recent years, as one of the measures to prevent global warming, low fuel consumption of automobiles and cleaner exhaust gas have been called for.However, from the viewpoint of improving fuel efficiency, reduction of vehicle weight, especially improvement of ride comfort and vehicle kinetic performance has been called. Considering that the above points are satisfied, the weight reduction of the suspension member is the most effective method. In order to reduce the weight of the suspension member, material conversion, ie, conversion from an iron alloy to an aluminum alloy, is considered as the most realistic option. Automobile parts are sometimes made of magnesium alloy with higher specific strength than aluminum alloy,
Due to the problem of fatigue strength, it is difficult to apply this alloy to members that receive repeated loads, such as suspension members. As a means for reducing the weight of the suspension member, it is conceivable to reduce the thickness of the suspension member within a range that does not impair the function. However, casting or forging involves manufacturing difficulties. Specifically, there are cases where it is difficult to significantly reduce the wall thickness, and when stealing by processing is performed, the cost is greatly increased and the shape is limited. Then, in order to obtain high reliability which was extremely difficult with the conventional casting method, it is conceivable to apply a semi-solid die casting method.
【０００３】半凝固ダイカスト鋳造法は、半溶融状態に
した溶湯をダイカストマシンの金型キャビティ内に加圧
充填し、凝固させる方法である。この半凝固ダイカスト
法には、溶湯を完全に冷却して凝固させたビレットを再
加熱して半溶融状態にした後鋳造するチクソキャスト
（Thixo cast）法（例えば特開平７−７４０１５号参
照）と、溶湯に剪断力を与えながら冷却し、溶融金属の
初晶を球状化させて半溶融状態にして鋳造するレオキャ
スト（Rhocast）法（例えば特開平８−２５７７２２号
参照）とがある。チクソキャスト法は既に実用化されて
いるが、所定の組成を有するビレットを準備し、これを
半溶融温度領域で例えば電磁攪拌後連続鋳造して、α相
を粒状化してから再加熱して球状化する手法であり、製
造コストが高くなるという問題がある。一方レオキャス
ト法によれば、ビレットを使用しないので、コスト的に
はチクソキャスト法よりも有利である。The semi-solid die casting method is a method in which a molten metal in a semi-molten state is charged under pressure into a mold cavity of a die casting machine and solidified. The semi-solid die casting method includes a thixo cast method (see, for example, JP-A-7-74015) in which a billet solidified by completely cooling a molten metal is reheated to a semi-molten state and then cast. There is a rhocast method (see, for example, JP-A-8-257722) in which a molten metal is cooled while being subjected to a shearing force, and a primary crystal of a molten metal is spheroidized and cast into a semi-molten state. Although the thixocast method has already been put to practical use, a billet having a predetermined composition is prepared, and this is continuously cast after, for example, electromagnetic stirring in a semi-melting temperature range, and the α phase is granulated and then reheated to form a spherical form. However, there is a problem that the manufacturing cost is increased. On the other hand, according to the rheocast method, since billet is not used, the cost is more advantageous than the thixocast method.
【０００４】[0004]
【発明が解決しようとする課題】よって上述した高強
度、高靭性の製品が得られる半凝固ダイカスト法により
サスペンション部材を製造することが考えられる。この
製法は層流充填が得られることや、収縮巣の低減ができ
る利点がある。しかして半凝固ダイカスト法を実施する
際には、キャビティ内での溶湯の分岐・合流を避ける必
要がある。これは分岐した溶湯が再度合流する際、湯温
が低い為に再度溶融せず、完全に密着しないことがあ
り、製品に欠陥として残ってしまう可能性が大きいから
である。そのためキャビティ内に充填中の溶湯流を分断
することは適切でない。製品にリブ部が存在すると、こ
のリブ部の両方から進入してきた溶湯の間に空気が溜
り、湯境となって現れ、製品の機能を著しく阻害する。
但しリブ部が製品の外周部にある場合には、金型の割面
から空気が逃げやすいため当該欠陥の発生はきわめて少
ない。しかしながらこのようなリブは製品強度設計上、
やむ得ず製品の外周部以外に設けなければならない必要
性が生じることがある。すなわち、サスペンション部材
を半凝固ダイカスト法で製造する場合には、強度と製造
のしやすさとを両立させることが重要である。Therefore, it is conceivable to manufacture a suspension member by a semi-solid die casting method capable of obtaining a product having high strength and high toughness as described above. This manufacturing method has the advantage that laminar flow packing can be obtained and shrinkage cavities can be reduced. Thus, when performing the semi-solid die casting method, it is necessary to avoid branching and merging of the molten metal in the cavity. This is because when the branched molten metal joins again, it does not melt again due to the low temperature of the molten metal, may not be completely adhered, and is highly likely to remain as a defect in the product. Therefore, it is not appropriate to divide the flow of the molten metal being filled into the cavity. If the product has ribs, air accumulates between the molten metals entering from both of the ribs and appears as a hot water boundary, which significantly impairs the function of the product.
However, when the rib portion is on the outer peripheral portion of the product, the defect is extremely rare because the air easily escapes from the split surface of the mold. However, such ribs are not suitable for product strength design.
In some cases, it is necessary to provide the product at a position other than the outer peripheral portion of the product. That is, when the suspension member is manufactured by the semi-solid die casting method, it is important to achieve both strength and ease of manufacturing.
【０００５】したがって、本発明の目的は、全体の機械
的強度が高くしかも製造し易い自動車用サスペンション
部材を提供することである。Accordingly, an object of the present invention is to provide an automobile suspension member having high overall mechanical strength and easy to manufacture.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
に、本発明においては、車輪を支持するアルミニウム合
金製サスペンション部材であって、Ａ型形状を有し、そ
の頂部から分岐する斜辺部は略凹形の断面形状を有し、
前記斜辺部を形成する内側リブの高さをｈ１、その厚さ
をｔ１、前記斜辺部を形成する外側リブの高さをｈ２、
その厚さをｔ２とすると、ｈ１＜ｈ２、ｔ１≦ｔ２の条
件を満足し、半凝固ダイカスト法により鋳造される、と
いう技術的手段を採用した。本発明においては、サスペ
ンション部材がＡ型形状を有し、中央部が開口している
ので、泥抜けを促進することができる。このサスペンシ
ョン部材は全体がアルミニウム合金で形成されているの
で、軽量化を図ることができる。更にこのサスペンショ
ン部材は、頂部から分岐する斜辺部が凹型の断面形状で
あって、しかも、斜辺部を形成する外側リブ部は内側リ
ブ部よりも厚くかつ内側リブ部は外側リブ部よりも低く
なっているので、外側リブ部及び内側リブ部とも金型温
度を高温に保つことができ、良好な湯流れを確保できる
ので、湯境やウェルドの発生を伴わずに、半凝固ダイカ
スト法により軽量でかつ高強度のサスペンション部材を
実現することができる。In order to achieve the above object, the present invention provides an aluminum alloy suspension member for supporting a wheel, which has an A-shape and has a hypotenuse branching off from the top. Has a substantially concave cross-sectional shape,
The height of the inner rib forming the hypotenuse portion is h 1 , the thickness thereof is t 1 , the height of the outer rib forming the hypotenuse portion is h 2 ,
Assuming that the thickness is t 2 , a technical means that the conditions of h 1 <h 2 and t 1 ≦ t 2 are satisfied and the casting is performed by a semi-solid die casting method is employed. In the present invention, since the suspension member has the A-shape and the central portion is open, it is possible to promote the removal of mud. Since the suspension member is entirely made of an aluminum alloy, the weight can be reduced. Further, in this suspension member, the oblique side branching off from the top has a concave cross-sectional shape, and the outer rib forming the oblique side is thicker than the inner rib and the inner rib is lower than the outer rib. The mold temperature can be kept high for both the outer and inner ribs, and a good flow of the molten metal can be ensured. In addition, a high-strength suspension member can be realized.
【０００７】本発明の半凝固ダイカスト法は、（ａ）Ａ
ｌ−Ｓｉ−Ｍｇ系合金を溶解して、その溶湯を液相線近
傍の温度にする工程と、（ｂ）前記溶湯を鋳込みスリー
ブに移し、この鋳込みスリーブ内の溶融金属の温度を液
相線近傍から液相線より低く固相線または共晶線より高
い所定の温度まで所定の冷却速度で低下させ、溶融金属
の初晶を実質的に粒状化させて半溶融状態を得る工程
と、（ｃ）初晶が粒状化した前記鋳込みスリーブ内の半
溶融状態金属を金型キャビティ内に加圧充填する工程
と、（ｄ）前記金型キャビティ内に加圧充填された半溶
融状態合金を凝固させて、サスペンション部材を作成す
る工程とを有することが好ましい。この製造方法によれ
ば、金属を溶解して液相線近傍の温度で鋳込みスリーブ
へ移すので鋳込みスリーブが高熱で損傷することが少な
くなり、また鋳込みスリーブ内溶融金属を液相線近傍か
ら液相線より低く固相線または共晶線より高い所定の温
度まで低下させる過程で機械撹拌、電磁撹拌その他、固
液体共存状態でせん断を与えることなく、溶融金属の初
晶が実質的に粒状化されて半溶融状態となり、かかる半
溶融状態金属を金型キャビティ内に加圧充填して凝固さ
せるのでブリスタ（気泡状きず）などが発生しない。The semi-solid die casting method of the present invention comprises the steps of (a) A
melting the l-Si-Mg alloy and bringing the molten metal to a temperature near the liquidus line; and (b) transferring the molten metal to a casting sleeve, and adjusting the temperature of the molten metal in the casting sleeve to the liquidus line. A step of reducing at a predetermined cooling rate from a vicinity to a predetermined temperature lower than the liquidus line and higher than the solidus line or the eutectic line to substantially granulate the primary crystal of the molten metal to obtain a semi-molten state; c) a step of press-filling the semi-molten metal in the casting sleeve in which the primary crystals are granulated into the mold cavity, and (d) solidifying the semi-molten alloy press-filled into the mold cavity. And forming a suspension member. According to this manufacturing method, since the metal is melted and transferred to the casting sleeve at a temperature near the liquidus line, the casting sleeve is less likely to be damaged by high heat, and the molten metal in the casting sleeve is moved from the vicinity of the liquidus line to the liquid phase. In the process of lowering to a predetermined temperature lower than the solid line or eutectic line below the solid line, the primary crystal of the molten metal is substantially granulated without mechanical stirring, electromagnetic stirring, or shearing in the coexistence of solid and liquid As a result, since the semi-molten metal is pressurized and filled into the mold cavity and solidified, blisters (bubbles) are not generated.
【０００８】また、鋳込みスリーブ内で半溶融状態金属
の固相率を３０〜６０％に制御することが好ましい。そ
れにより溶融金属にチキソトロピー性を付与することが
でき、しかも湯流れを良好に保つことができる。すなわ
ち半溶融状態金属の固相率を３０％以上とすることによ
り溶融金属にチキソトロピー性を付与することができ一
方半溶融状態金属の固相率を６０％未満とすることによ
り粘性が過度に高くなることを防止して湯流れを良好に
保つことができる。It is preferable to control the solid fraction of the semi-molten metal in the casting sleeve to 30 to 60%. Thereby, thixotropic properties can be imparted to the molten metal, and the flow of the molten metal can be kept good. That is, the thixotropic property can be imparted to the molten metal by setting the solid phase ratio of the semi-molten metal to 30% or more, while the viscosity is excessively high by setting the solid phase ratio of the semi-molten metal to less than 60%. And the hot water flow can be kept good.
【０００９】更に、鋳込みスリーブ内の半溶融状態金属
を層流状態で金型キャビティ内に加圧充填し、その後高
圧を付与することが良い。それにより、半溶融状態金属
へのガスの巻き込みを防止して、ブリスタの発生を防止
することができる。また、金型キャビティ内を、少なく
とも半溶融状態金属を充填時に減圧雰囲気および／また
は不活性ガス雰囲気としたり、前記鋳込みスリーブ内を
不活性ガス雰囲気とするのが好ましい。その様にするこ
とにより、材料が半溶融状態を保つよう温度コントロー
ルすることができると共に表面の酸化が防止され、特別
な表面層除去法を実施することなく良好な製品を得るこ
とが出来る。Furthermore, it is preferable that the semi-molten metal in the casting sleeve is pressurized and filled into the mold cavity in a laminar flow state, and then high pressure is applied. Thereby, the entrainment of gas into the semi-molten metal can be prevented, and the occurrence of blisters can be prevented. It is preferable that the inside of the mold cavity be at least a reduced pressure atmosphere and / or an inert gas atmosphere at the time of filling the semi-molten metal, or the interior of the casting sleeve be an inert gas atmosphere. By doing so, the temperature can be controlled so as to maintain the material in a semi-molten state, the surface is prevented from being oxidized, and a good product can be obtained without performing a special surface layer removing method.
【００１０】[0010]
【発明の実施の形態】以下本発明の詳細を添付図面によ
り説明する。図１は本発明のサスペンション部材を備え
たサスペンション装置の一例を示す斜視図である。図１
において、１は車輪（図示せず）を回転自在に支持する
ナックルであり、ナックル１の上部にはストラット２が
一体に締結されており、ナックル１の下部と車体側部材
（図示せず）とが、車幅方向に延在するサスペンション
部材３によって揺動可能に連結されている。サスペンシ
ョン部材３はＡ型形状をしており、Ａ型の頂部が車輪側
取付け部３ａで、Ａ型の下部の２点が車体側取付け部３
ｂ、３ｃである。車体側取付け部３ｂ、３ｃは、それぞ
れ相互に車体前後方向に所定間隔をあけて配置され、軸
を車体前後方向に向けたブッシュ４ａ、４ｂを介して車
体側に揺動可能に取付けられている。図２は図１のサス
ペンスション部材の正面図、図３は図２のＡ−Ａ線断面
図である。両図において、サスペンション部材３は、頂
部２０から２つの斜辺部２１、２２に分岐され、中央部
に開口部２３を有し、この開口部２３から泥が排出でき
るようになっている。斜辺部２１は、図３に示すよう
に、内側リブ２４及び外側リブ２５を有し、凹形の断面
形状を有する。内側リブ２４の高さ及び厚さを各々
ｈ １、ｔ１とし、外側リブ２５の高さ及び厚さを各々ｈ
２、ｔ２とすると、これらの寸法関係は、ｈ１＜ｈ２、
ｔ１≦ｔ２の条件を満足している。斜辺部２２も斜辺部
２１と同様の断面形状を有し、また同様の寸法関係を有
している。BRIEF DESCRIPTION OF THE DRAWINGS FIG.
Will be described. FIG. 1 includes the suspension member of the present invention.
FIG. 2 is a perspective view showing an example of a suspension device according to the first embodiment. FIG.
, 1 is a rotatably supporting wheel (not shown).
It is a knuckle, and a strut 2 is above the knuckle 1.
The lower part of the knuckle 1 and the vehicle body side member are fastened together.
(Not shown) and a suspension extending in the vehicle width direction.
It is swingably connected by a member 3. Suspension
The component 3 has an A-shape, and the top of the A-shape is on the wheel side.
In the mounting portion 3a, the lower two points of the A type are
b, 3c. The vehicle body side mounting portions 3b and 3c are respectively
Are arranged at predetermined intervals in the longitudinal direction of the vehicle
Through the bushes 4a and 4b with the
It is swingably attached to the body side. FIG. 2 shows the suspension of FIG.
FIG. 3 is a cross-sectional view taken along line AA of FIG.
FIG. In both figures, the suspension member 3 is
The part 20 is branched into two oblique parts 21 and 22 and the central part
Has an opening 23 through which mud can be discharged.
It has become so. As shown in FIG.
Having an inner rib 24 and an outer rib 25 and having a concave cross section.
It has a shape. The height and thickness of the inner rib 24
h 1, T1And the height and thickness of the outer rib 25 are each h
2,t2Then, these dimensional relationships are h1<H2,
t1≤t2The condition is satisfied. The hypotenuse 22 is also the hypotenuse
21 has the same cross-sectional shape and the same dimensional relationship.
are doing.
【００１１】上記の寸法関係を定めた理由は次の通りで
ある。サスペンション部材３を半凝固ダイカスト法によ
り製造する場合、所定温度に加熱された金型のキャビテ
ィ内に溶湯を注入すると、溶湯は図３の矢印で示すよう
に内側リブ２４から外側リブ２５に向かって流れる。こ
の場合、内側リブ２４はその高さが内側に対して低くな
っているので、その部分の金型温度は低下せずかつ行き
止まりとなつている袋状の部分の体積を低減できること
から、湯流れが良くなり、ガスや異物の巻き込みが無く
なり、湯境やウェルドの発生を防止することができる。
なお外側リブ２５は高さは大であるが厚さも大なので、
その部分の金型温度は高温に維持される。さらに、内側
リブの高さをｈ１、その厚さをｔ１、外側リブの高さを
ｈ２、その厚さをｔ２としたとき、ｈ１／ｔ１＜１、ｈ
２／ｔ２＞１／２の条件を満足する形状（斜辺部を形成
する内側リブ部の厚さより小さくし、かつ、外側リブ部
の高さを外側リブ部の厚さの１／２より大きくなる形
状）として、より機械強度を高くすることができる。The reason for determining the above dimensional relationship is as follows. In the case where the suspension member 3 is manufactured by the semi-solid die casting method, when the molten metal is poured into the cavity of the mold heated to a predetermined temperature, the molten metal flows from the inner rib 24 to the outer rib 25 as shown by an arrow in FIG. Flows. In this case, since the height of the inner rib 24 is lower than that of the inner side, the mold temperature at that portion does not decrease and the volume of the dead-end bag-shaped portion can be reduced. And the entrapment of gas and foreign matter is eliminated, and the occurrence of hot water boundaries and welds can be prevented.
Although the outer rib 25 has a large height and a large thickness,
The mold temperature in that part is maintained at a high temperature. Further, assuming that the height of the inner rib is h 1 , its thickness is t 1 , the height of the outer rib is h 2 , and its thickness is t 2 , h 1 / t 1 <1, h
A shape that satisfies the condition of 2 / t 2 > 1/2 (the thickness is smaller than the thickness of the inner rib forming the oblique side, and the height of the outer rib is larger than １ ／ of the thickness of the outer rib. In this case, the mechanical strength can be further increased.
【００１２】一方、内側リブ２４及び外側リブ２５が上
述した寸法関係を満足しない場合には、サスペンション
部材３は例えば図５に示すような断面形状を有する。図
５において、図３と同一機能部分は同一の参照符号で示
す。図５に示す断面形状であると、外側リブ２５は高さ
及び厚さのいずれも大なので、その部分の金型温度は高
温に維持されるが、内側リブ２４は、外側リブ２５と同
程度の高さを有するにも係わらず、外側リブ２５よりも
薄くなっているので、その部分の金型温度は低下し、溶
湯の流れにくい内側リブ２４の先端部が最終充填部とな
る。従って図６（図５のＢ−Ｂ線断面図）に示すように
２つの方向からの湯流れが合流し、しかも、内側リブ２
４は袋状部位（行き止まり）になっているので、酸化膜
などの異物を含んだ湯流れの先端の逃げ場がなく、ウェ
ルド現象が発生する。On the other hand, when the inner rib 24 and the outer rib 25 do not satisfy the above-mentioned dimensional relationship, the suspension member 3 has, for example, a sectional shape as shown in FIG. 5, the same functional parts as those in FIG. 3 are indicated by the same reference numerals. In the cross-sectional shape shown in FIG. 5, since the outer rib 25 is large in both height and thickness, the mold temperature at that portion is maintained at a high temperature, but the inner rib 24 is substantially the same as the outer rib 25. Despite the height, the mold temperature at that portion is reduced, and the tip of the inner rib 24 where the molten metal is less likely to flow becomes the final filling portion. Therefore, as shown in FIG. 6 (a sectional view taken along the line BB in FIG. 5), the molten metal flows from the two directions merge, and
Since 4 is a bag-shaped portion (dead end), there is no escape point at the tip of the flow of hot water containing foreign substances such as an oxide film, and a weld phenomenon occurs.
【００１３】次に本発明のサスペンション部材の製造装
置を添付図面に基いて説明する。図４は本発明のサスペ
ンション部材を製造するための装置の一例を示す断面図
である。製造装置１０は、保持炉（図示せず）内の溶融
金属を受け取り、半溶融金属１２を形成する鋳込みスリ
ーブ１３と、この半溶融金属を金型３０に向って押し出
すプランジャ１４を有する。鋳込みスリーブ１３は、セ
ラミックス等の絶縁体１６とその内部に放射状に埋め込
まれたオーステナイト系ステンレス鋼等の非磁性導電体
からなる冷却パイプ１７からなる内筒１５と、その周囲
に設けられた誘導コイル１９が埋設された外筒１８とを
有する。金型３０は、固定金型３１と、可動金型３２及
びキャビティ３３とを有する。Next, an apparatus for manufacturing a suspension member according to the present invention will be described with reference to the accompanying drawings. FIG. 4 is a sectional view showing an example of an apparatus for manufacturing the suspension member of the present invention. The manufacturing apparatus 10 has a casting sleeve 13 for receiving a molten metal in a holding furnace (not shown) and forming a semi-molten metal 12, and a plunger 14 for extruding the semi-molten metal toward a mold 30. The casting sleeve 13 includes an inner cylinder 15 made of an insulator 16 made of ceramics and a cooling pipe 17 made of a non-magnetic conductor made of austenitic stainless steel or the like radially embedded therein, and an induction coil provided therearound. 19 has an embedded outer cylinder 18. The mold 30 has a fixed mold 31, a movable mold 32, and a cavity 33.
【００１４】次に上記装置による動作を説明する。所定
の組成を有する合金を溶解して、その溶湯を液相線（６
２６℃）近傍の温度（６２０〜６３０℃）に維持してお
き、この溶湯をラドル（図示せず）から鋳込みスリーブ
１３内に注入する。この時冷却パイプ１７に冷却媒体
（例えば水又は空気）を供給することにより、溶湯を液
相線近傍の温度から液相線より低く固相線又は共晶線よ
り高い温度（５８０℃程度）まで冷却させる。これによ
り合金溶湯は初晶が粒状化された半溶融状態となる。ま
た溶湯の半溶融化の過程では、誘導コイル１９に通電す
ることにより、半溶融溶湯を電磁的に攪拌する。次いで
プランジャ１４を作動させて、キャビティ３３内に半溶
融化した溶湯を射出充填する。そしてキャビティ３３内
に注入された溶湯が凝固した後、型開きを行ってサスペ
ンション部材を金型３０から取出す。Next, the operation of the above device will be described. An alloy having a predetermined composition is melted and the molten metal is melted at a liquidus line (6).
The temperature is maintained at about 620-630 ° C., and the molten metal is poured into the casting sleeve 13 from a ladle (not shown). At this time, by supplying a cooling medium (for example, water or air) to the cooling pipe 17, the temperature of the molten metal is changed from a temperature near the liquidus to a temperature lower than the liquidus and higher than the solidus or eutectic (about 580 ° C.). Let cool. As a result, the molten alloy becomes a semi-molten state in which primary crystals are granulated. In the process of semi-molten melting of the molten metal, the half-molten molten metal is electromagnetically stirred by supplying electricity to the induction coil 19. Next, the plunger 14 is operated to inject and fill the semi-molten molten metal into the cavity 33. Then, after the molten metal injected into the cavity 33 is solidified, the mold is opened to take out the suspension member from the mold 30.
【００１５】[0015]
【実施例】以下、本発明の実施例を説明する。図４に示
す装置を用いて、図２及び図３に示すサスペンション部
材の製造を行う。先ず、Ｓｉ６．５〜７．５％（重量％
以下も同様）、Ｍｇ０．２５〜０．３５、Ｆｅ０．５％
以下、残部実質的にＡｌからなる組成を有する合金を溶
解して液相線（６２０℃）近傍の約６３０℃の温度に保
持する。次に、この合金溶湯を図示しない給湯手段によ
り、鋳込みスリーブ１３に移す。そして、粒状の組織と
なるように、鋳込みスリーブ１３内で液相線近傍から液
相線より低く固相線または共晶線より高い、約５８０℃
の温度まで低下させる。上記合金では鋳込みスリーブ１
３内の冷却速度は、０．５〜８℃／ｓが良く、好ましく
は１〜４℃／ｓが良い。これにより、合金溶湯は初晶が
粒状化した半溶融状態となる。Embodiments of the present invention will be described below. The suspension member shown in FIGS. 2 and 3 is manufactured using the apparatus shown in FIG. First, Si 6.5 to 7.5% (% by weight)
The same applies to the following), Mg 0.25 to 0.35, Fe 0.5%
Thereafter, an alloy having a composition substantially consisting of Al is melted and the temperature is maintained at about 630 ° C. near the liquidus line (620 ° C.). Next, the molten alloy is transferred to the casting sleeve 13 by hot water supply means (not shown). Then, in the casting sleeve 13, at a temperature lower than the liquidus line and lower than the liquidus line and higher than the solidus line or the eutectic line, about 580 ° C., so as to have a granular structure.
Temperature. Casting sleeve 1 with the above alloy
The cooling rate in 3 is preferably 0.5 to 8 ° C / s, more preferably 1 to 4 ° C / s. Thereby, the molten alloy becomes a semi-molten state in which primary crystals are granulated.
【００１６】次に、初晶が粒状化したの半溶融金属１２
を金型のキャビティ３３内に、プランジャ１４により、
層流状態を維持して加圧充填する。組織は、加圧充填す
る過程のゲートで、粒状のものがいっそう微細化し、且
つ球状に変わる。半溶融金属の組織は、鋳込みスリーブ
内で粒状化された後、金型キャビティ内に充填後、結晶
は微細でより真円に近くなっている。鋳込みスリーブ１
３内での半溶融金属の固相率は、上記アルミニウム合金
の状態図と温度から３０〜６０％にする。鋳込みスリー
ブ１３内で半溶融金属として、これを金型のキャビティ
３３内に加圧充填して凝固させ、金型を型開きをするこ
とにより、サスペンション部材が得られる。このサスペ
ンション部材を使用して図１に示すサスペンション装置
に装着して、台上試験を行ったが、サスペンション部材
に異常は認められなかった。また比較のために、キャビ
ティ形状を変更した以外は上記と同様の条件で図５に示
す断面形状を有するサスペンション部材を製造した。こ
のようにして得られたサスペンション部材を用いて上記
同様の条件で台上試験を行ったが、内側リブに亀裂が発
生し、その破面をＳＥＭで観察したところ、酸化膜が認
められた。Next, the semi-molten metal 12 having the primary crystals granulated
Into the cavity 33 of the mold by the plunger 14.
Pressure filling is performed while maintaining a laminar flow state. At the gate during the process of pressure filling, the granular structure becomes finer and changes to a spherical shape. After the structure of the semi-molten metal has been granulated in the casting sleeve and then filled in the mold cavity, the crystals are finer and closer to a perfect circle. Cast sleeve 1
The solid phase ratio of the semi-molten metal in 3 is set to 30 to 60% based on the phase diagram and temperature of the aluminum alloy. As a semi-molten metal in the casting sleeve 13, it is filled into the cavity 33 of the mold under pressure and solidified, and the mold is opened to obtain a suspension member. Using this suspension member, it was mounted on the suspension apparatus shown in FIG. 1 and a bench test was conducted. No abnormality was found in the suspension member. For comparison, a suspension member having the cross-sectional shape shown in FIG. 5 was manufactured under the same conditions as above except that the cavity shape was changed. A bench test was performed using the suspension member obtained in this manner under the same conditions as described above. A crack was generated in the inner rib, and when the fracture surface was observed by SEM, an oxide film was observed.
【００１７】[0017]
【発明の効果】以上、説明した通り、本発明によれば、
サスペンション部材を特定の形状としかつ半溶融状態と
して金型キャビティ内に加圧充填して製造するので、軽
量かつ機械強度が高くしかも欠陥のないサスペンション
部材を得ることが可能である。As described above, according to the present invention,
Since the suspension member is manufactured in a specific shape and in a semi-molten state by pressure filling in a mold cavity, it is possible to obtain a lightweight, high mechanical strength and defect-free suspension member.
【図１】サスペンション装置の一例を示す斜視図であ
る。FIG. 1 is a perspective view showing an example of a suspension device.
【図２】本発明の一実施例に係るサスペンション部材の
平面図である。FIG. 2 is a plan view of a suspension member according to one embodiment of the present invention.
【図３】図２のＡ−Ａ線断面図である。FIG. 3 is a sectional view taken along line AA of FIG. 2;
【図４】本発明のサスペンション部材の製造装置の一例
を示す。FIG. 4 shows an example of a suspension member manufacturing apparatus of the present invention.
【図５】従来のサスペンション部材の要部断面図であ
る。FIG. 5 is a sectional view of a main part of a conventional suspension member.
【図６】図５のＢ−Ｂ線断面図である。FIG. 6 is a sectional view taken along line BB of FIG. 5;
３ サスペンション部材、２０ 頂部、２１，２２ 斜
辺部、２３ 開口部、２４ 内側リブ部、２５ 外側リ
ブ部3 Suspension member, 20 top, 21, 22 hypotenuse, 23 opening, 24 inside rib, 25 outside rib
Claims (2)
ペンション部材であって、Ａ型形状を有し、その頂部か
ら分岐する斜辺部は略凹形の断面形状を有し、前記斜辺
部を形成する内側リブの高さをｈ１、その厚さをｔ１、
前記斜辺部を形成する外側リブの高さをｈ２、その厚さ
をｔ２とすると、ｈ１＜ｈ２、ｔ１≦ｔ２の条件を満足
し、半凝固ダイカスト法により鋳造されたことを特徴と
する自動車用サスペンション部材。1. An aluminum alloy suspension member for supporting a wheel, having an A-shape, a hypotenuse branching off from a top thereof having a substantially concave cross-sectional shape, and an inner side forming the hypotenuse. The height of the rib is h 1 , its thickness is t 1 ,
Assuming that the height of the outer rib forming the hypotenuse portion is h 2 and its thickness is t 2 , the conditions of h 1 <h 2 , t 1 ≦ t 2 are satisfied, and the casting is performed by a semi-solid die casting method. An automobile suspension member characterized by the above-mentioned.
＜１、ｈ２／ｔ２＞１／２の条件を満足することを特徴
とする請求項１記載の自動車用サスペンション部材。2. The suspension member according to claim 1, wherein h 1 / t 1.
<1, h 2 / t 2 > 1/2 automotive suspension member according to claim 1, characterized by satisfying the condition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16681699A JP4215226B2 (en) | 1999-06-14 | 1999-06-14 | Automotive suspension materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16681699A JP4215226B2 (en) | 1999-06-14 | 1999-06-14 | Automotive suspension materials |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000355206A true JP2000355206A (en) | 2000-12-26 |
| JP4215226B2 JP4215226B2 (en) | 2009-01-28 |
Family
ID=15838205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16681699A Expired - Fee Related JP4215226B2 (en) | 1999-06-14 | 1999-06-14 | Automotive suspension materials |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4215226B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102248100A (en) * | 2010-03-15 | 2011-11-23 | 株式会社神户制钢所 | Automobile walking component and manufacturing of the same |
| FR2991611A1 (en) * | 2012-06-11 | 2013-12-13 | Peugeot Citroen Automobiles Sa | ARM FOR SUSPENSION OF A WHEEL TO THE BODY OF A MOTOR VEHICLE WITH CONTINUOUS REINFORCEMENT |
| EP2759423A1 (en) * | 2013-01-28 | 2014-07-30 | Gestamp Umformtechnik GmbH | Suspension arm made of fibre-reinforced plastic for a wheel suspension of a vehicle |
-
1999
- 1999-06-14 JP JP16681699A patent/JP4215226B2/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102248100A (en) * | 2010-03-15 | 2011-11-23 | 株式会社神户制钢所 | Automobile walking component and manufacturing of the same |
| US8961714B2 (en) | 2010-03-15 | 2015-02-24 | Kobe Steel, Ltd. | Automobile suspension part |
| US9527369B2 (en) | 2010-03-15 | 2016-12-27 | Kobe Steel, Ltd. | Method of manufacturing an automobile suspension part |
| FR2991611A1 (en) * | 2012-06-11 | 2013-12-13 | Peugeot Citroen Automobiles Sa | ARM FOR SUSPENSION OF A WHEEL TO THE BODY OF A MOTOR VEHICLE WITH CONTINUOUS REINFORCEMENT |
| WO2013186456A1 (en) * | 2012-06-11 | 2013-12-19 | Peugeot Citroen Automobiles Sa | Arm for suspending a wheel from the body of a motor vehicle with continuous reinforcement |
| EP2759423A1 (en) * | 2013-01-28 | 2014-07-30 | Gestamp Umformtechnik GmbH | Suspension arm made of fibre-reinforced plastic for a wheel suspension of a vehicle |
| CN103963588A (en) * | 2013-01-28 | 2014-08-06 | 海斯坦普金属成型有限责任公司 | Transverse link made of fiber-reinforced plastic for wheel suspension of vehicle |
| US9168801B2 (en) | 2013-01-28 | 2015-10-27 | Gestamp Umformtechnik Gmbh | Transverse link made of fibre-reinforced plastics material for a wheel suspension of a vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4215226B2 (en) | 2009-01-28 |
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