JP2005059813A - Suspension member and its manufacturing method - Google Patents

Suspension member and its manufacturing method Download PDF

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JP2005059813A
JP2005059813A JP2003296351A JP2003296351A JP2005059813A JP 2005059813 A JP2005059813 A JP 2005059813A JP 2003296351 A JP2003296351 A JP 2003296351A JP 2003296351 A JP2003296351 A JP 2003296351A JP 2005059813 A JP2005059813 A JP 2005059813A
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suspension member
thickness
mold
temperature
strength
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JP4273316B2 (en
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Yuji Okada
裕二 岡田
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Toyota Motor Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To increase the productivity of a suspension member and secure necessary elongation or strength for necessary portions. <P>SOLUTION: The wall thicknesses of portions A1, A2, and A3 requiring elongation against impact are reduced, and formed at a rather high temperature. Further, the wall thickness of a portion such as a suspension arm mounting part 6a which requires a high strength is increased, and formed at a rather low temperature. Since the necessary elongation against impact is secured by reducing the wall thicknesses of the portions A1, A2, and A3, a heat treatment can be eliminated. Also, since the portions A1, A2, and A3 reduced in wall thickness are formed at a rather high temperature, the occurrence of molten metal flow defect in casting can be suppressed. On the other hand, since the wall thickness of the portion such as the suspension arm mounting part 6a which requires a high strength is increased and formed at the low temperature, the cooling of the molten metal at the portion can be promoted while securing the necessary strength to sufficiently provide a productivity increasing effect in a die casting method. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、アルミニウム合金製サスペンションメンバーに関するものである。   The present invention relates to an aluminum alloy suspension member.

近年、車体の軽量化を進めるために、アルミニウム合金を使用したサスペンションメンバーが用いられるようになっている。図５には、サスペンションメンバー１を使用したフロントサスペンション構造の一例を示している。サスペンションメンバー１は、車体下部に固定されると共にエンジンを下方から支え、かつ、サスペンションアーム３、４を軸支するものである。ショックアブソーバー５は、サスペンションアーム３、４に軸支されるフロントアクスル２のナックル部と、車体との間に設けられている。このサスペンションメンバー１には、車体衝突時には大きく変形してその衝撃を十分に吸収し、キャビンへのダメージを軽減する一方、サスペンションアーム取付部１ａのような車両走行時に複雑な力を受ける部位は、十分な強度を備えることが要求される。
そこで、従来から、アルミ合金ダイカスト製サスペンションメンバーの強度を高めるために、鋳造の際、サスペンションアーム取付部に湯道の出口を臨ませて、アーム取付部の鋳造組織を緻密にし、かかる部分の強度を高める技術が開発されている（例えば、特許文献１参照。）。また、製品の断面積を意図的に変化させることにより、衝撃吸収性能に優れ、安定した変形モードを示すアルミニウム鋳物等の発明がなされている（例えば、特許文献２参照。）。 In recent years, suspension members using an aluminum alloy have been used to reduce the weight of the vehicle body. FIG. 5 shows an example of a front suspension structure using the suspension member 1. The suspension member 1 is fixed to the lower part of the vehicle body, supports the engine from below, and pivotally supports the suspension arms 3 and 4. The shock absorber 5 is provided between the knuckle portion of the front axle 2 pivotally supported by the suspension arms 3 and 4 and the vehicle body. The suspension member 1 is greatly deformed at the time of a vehicle body collision and sufficiently absorbs the impact to reduce the damage to the cabin. On the other hand, a portion that receives a complex force when the vehicle travels, such as the suspension arm attachment portion 1a, It is required to have sufficient strength.
Therefore, in order to increase the strength of aluminum alloy die-cast suspension members, conventionally, the casting arm of the arm mounting part is made dense by making the runner outlet face the suspension arm mounting part during casting, and the strength of this part is increased. A technique for enhancing the above has been developed. In addition, by intentionally changing the cross-sectional area of a product, an invention such as an aluminum casting having excellent shock absorption performance and a stable deformation mode has been made (see, for example, Patent Document 2).

特開２００２−１３７７５８号公報（〔０００６〕、〔０００７〕、図４）JP 2002-137758 A ([0006], [0007], FIG. 4) 特開２００２−３９２４５号公報（請求項１、図１〜図４）JP 2002-39245 A (Claim 1, FIGS. 1 to 4)

しかしながら、上記のような従来技術によると、生産性の向上が困難であり、サスペンションメンバー１の部品コストを増大させるという欠点を有していた。
また、製造効率向上のため、サスペンションメンバー１はダイカスト鋳造法により製造されることが望ましいが、サスペンションメンバー１に適した機械的性質を有するアルミニウム合金として挙げられるＪＩＳ−ＡＣ４ＣＨは、ダイカスト鋳造法に適さず、従来は低圧鋳造法や重力鋳造法による必要があった。しかも、重力鋳造法により得られたサスペンションメンバー１に、必要な伸び性を持たせるためには、鋳造後に熱処理（Ｔ６処理）を行う必要があったことも、生産性の低下および製造コストの増大を招く原因となっていた。 However, according to the prior art as described above, it is difficult to improve productivity, and there is a disadvantage that the cost of parts of the suspension member 1 is increased.
In order to improve manufacturing efficiency, the suspension member 1 is preferably manufactured by a die casting method. However, JIS-AC4CH, which is cited as an aluminum alloy having mechanical properties suitable for the suspension member 1, is suitable for the die casting method. Conventionally, it has been necessary to use a low pressure casting method or a gravity casting method. Moreover, in order to give the suspension member 1 obtained by the gravity casting method the necessary elongation, it is necessary to perform heat treatment (T6 treatment) after casting, which also reduces productivity and increases manufacturing costs. Was the cause.

本発明は上記課題に鑑みてなされたものであり、その目的とするところは、サスペンションメンバーをダイカスト鋳造法によって成形することによって生産性を向上させ、かつ、必要な部位に必要な伸び若しくは強度を確保することで、成形後の熱処理も不要とした、アルミニウム合金製サスペンションメンバーおよびその製造方法を提供することにある。   The present invention has been made in view of the above problems, and the object of the present invention is to improve productivity by molding a suspension member by a die casting method, and to provide a necessary elongation or strength at a necessary portion. It is an object of the present invention to provide an aluminum alloy suspension member and a method for manufacturing the same, which do not require heat treatment after forming.

上記課題を解決するための、本発明の請求項１に係るサスペンションメンバーは、アルミニウム合金のダイカスト製サスペンションメンバーであって、肉厚が小さくかつ比較的高温で成形され、衝撃に対する伸びが確保された部位と、肉厚が大きくかつ比較的低温で成形され、高い強度が確保された部位とを備えることを特徴とするものである。
本発明によれば、サスペンションメンバーの衝撃に対する伸びを必要とする部位については、肉厚を小さくして衝撃を受けたときの変形を促すと共に、かかる部位を高温で成形することで、鋳造時の湯流れ性を十分に確保することができる。さらに、比較的高温で成形することによって、製品表面におけるチル層の形成を防ぎ、伸び性の低下を回避することができる。このようにして成形された肉厚を薄くした部位は、熱処理を施すことなく必要な伸び性が確保される。
一方、サスペンションメンバーの高い強度を必要とする部位については、肉厚を大きくして十分な強度を確保すると共に、低温で成形して溶湯の冷却を促すことで、ダイカスト鋳造法による生産効率向上の効果を十分に享受することができる。 A suspension member according to claim 1 of the present invention for solving the above problems is a die-cast suspension member made of an aluminum alloy, and is formed with a small thickness and at a relatively high temperature, so that elongation against impact is ensured. It comprises a part and a part that has a large thickness and is molded at a relatively low temperature to ensure high strength.
According to the present invention, the portion of the suspension member that needs to be stretched with respect to the impact is facilitated to be deformed when subjected to the impact by reducing the thickness, and at the time of casting, the portion is molded at a high temperature. Sufficient hot water flow can be ensured. Furthermore, by molding at a relatively high temperature, formation of a chill layer on the product surface can be prevented, and a decrease in extensibility can be avoided. Thus, the site | part which made the thickness thin shape | molded ensures the required extensibility, without performing heat processing.
On the other hand, for parts that require high strength of the suspension member, the thickness is increased to ensure sufficient strength, and at the same time, molding is performed at a low temperature to promote cooling of the molten metal, thereby improving the production efficiency by the die casting method. The effect can be fully enjoyed.

また、本発明の請求項２に係るサスペンションメンバーは、請求項１記載のサスペンションメンバーにおいて、前記肉厚が小さい部位の湯流れ性が金型の油温調手段によって確保され、前記肉厚が大きい部位の冷却性が金型の水冷却手段によって確保されてなるものである。
本発明によれば、前記肉厚が小さい部位の湯流れ性が金型の油温調手段によって確保されていることから、サスペンションメンバーに肉厚の小さい部位を構成しつつ、係る部位に湯流れ不良が発生することを防ぐことが可能となる。また、前記肉厚が大きい部位の冷却性が金型の水冷却手段によって確保されていることから、サスペンションメンバーに肉厚の大きい部位を構成しつつ、係る部位の冷却速度を高め、ダイカスト鋳造法による生産効率向上の効果を十分に享受することができる。 The suspension member according to claim 2 of the present invention is the suspension member according to claim 1, wherein the hot water flowability of the portion with the small thickness is ensured by the oil temperature adjusting means of the mold, and the thickness is large. The coolability of the part is ensured by the water cooling means of the mold.
According to the present invention, since the hot water flowability of the portion with the small wall thickness is ensured by the oil temperature adjusting means of the mold, the hot water flow to the portion of the suspension member is formed while forming the portion with the small wall thickness. It becomes possible to prevent the occurrence of defects. In addition, since the cooling property of the part having the large thickness is ensured by the water cooling means of the mold, the part having the large thickness is formed on the suspension member, the cooling rate of the part is increased, and the die casting method It is possible to fully enjoy the effect of improving the production efficiency.

また、本発明の請求項３に係るサスペンションメンバーは、請求項請求項１または２記載のサスペンションメンバーにおいて、前記高温成形部位に係る金型温度が前記油温調手段により200℃以上に設定され、前記低温成形部位に係る金型温度が前記水冷却手段により180℃以下に設定されてなるものである。
本発明によれば、前記油温調手段により加熱される部位の金型温度が200℃以上に設定されることで、サスペンションメンバーに肉厚の小さい部位を構成しつつ、係る部位における湯流性を十分に確保することができる。また、前記水冷却手段により冷却される部位の金型温度が180℃以下に設定されることで、サスペンションメンバーに肉厚の大きい部位を構成しつつ、かかる部位の冷却速度を高めることが可能となる。よって、ダイカスト鋳造法による生産効率向上の効果を十分に享受することができる。 Further, in the suspension member according to claim 3 of the present invention, in the suspension member according to claim 1 or 2, the mold temperature related to the high temperature molding portion is set to 200 ° C. or more by the oil temperature adjusting means, The mold temperature related to the low temperature molding part is set to 180 ° C. or less by the water cooling means.
According to the present invention, the mold temperature of the portion heated by the oil temperature adjusting means is set to 200 ° C. or higher, so that the portion of the suspension member having a small thickness is formed, and the molten metal flow in the portion is concerned. Can be secured sufficiently. Further, by setting the mold temperature of the portion cooled by the water cooling means to 180 ° C. or less, it is possible to increase the cooling rate of such a portion while forming a thick portion on the suspension member. Become. Therefore, the effect of improving the production efficiency by the die casting method can be fully enjoyed.

また、上記課題を解決するための、本発明の請求項４に係るサスペンションメンバーの製造方法は、アルミニウム合金のダイカスト製サスペンションメンバーの製造方法であって、衝撃に対する伸びを必要とする部位の肉厚を小さくて比較的高温で成形し、高い強度を必要とする部位の肉厚を大きくして比較的低温で成形することを特徴とするものである。
本発明によれば、衝撃に対する伸びを必要とする部位の肉厚を小さくすることで、衝撃に対する必要な伸びを確保することが可能となる。また、当該肉厚を小さくした部位を比較的高温で成形することで、鋳造時における湯流れ不良の発生を抑えることが可能となる。さらに、比較的高温で成形することによって、製品表面におけるチル層の形成を防ぎ、伸び性の低下を回避することができる。このようにして肉厚を薄くした部位を成形することにより、かかる部位に、熱処理を施すことなく必要な伸び性を確保することができる。
一方、高い強度を必要とする部位の肉厚を大きくし低温で成形することで、必要な強度を確保しつつ当該肉厚を大きくした部位の溶湯の冷却を促し、ダイカスト鋳造法による生産効率向上の効果を十分に享受することができる。 A suspension member manufacturing method according to claim 4 of the present invention for solving the above-mentioned problem is a method for manufacturing a die-cast suspension member made of an aluminum alloy, and is a thickness of a portion that requires elongation to impact. And forming at a relatively low temperature by increasing the thickness of a portion requiring high strength.
According to the present invention, it is possible to ensure the necessary elongation with respect to the impact by reducing the thickness of the portion requiring the elongation with respect to the impact. Moreover, it becomes possible to suppress generation | occurrence | production of the hot water flow defect at the time of casting by shape | molding the site | part which reduced the said thickness at comparatively high temperature. Furthermore, by molding at a relatively high temperature, formation of a chill layer on the product surface can be prevented, and a decrease in extensibility can be avoided. By forming a portion with a reduced thickness in this manner, the necessary extensibility can be ensured without subjecting such a portion to heat treatment.
On the other hand, by increasing the thickness of the parts that require high strength and molding at low temperature, the molten metal at the parts where the thickness is increased is promoted while ensuring the required strength, and the production efficiency is improved by die casting. It is possible to fully enjoy the effects.

また、本発明の請求項５に係るサスペンションメンバーの製造方法は、請求項４記載のサスペンションメンバーの製造方法において、前記肉厚を小さくした部位の湯流れ性を、金型の油温調手段によって加熱することにより確保し、前記肉厚を大きくした部位の冷却性を、金型の水冷却手段によって冷却することにより確保したものである。
本発明によれば、前記肉厚が小さい部位の湯流れ性を、金型の油温調手段によって加熱することにより確保し、サスペンションメンバーに肉厚の小さい部位を構成しつつ、かかる部位に湯流れ不良が発生することを防ぐことが可能となる。また、前記肉厚が大きい部位の冷却性を、金型の水冷却手段によって確保されていることから、サスペンションメンバーに肉厚の大きい部位を構成しつつ、かかる部位の冷却速度を高め、ダイカスト鋳造法による生産効率向上の効果を十分に享受することができる。 A suspension member manufacturing method according to claim 5 of the present invention is the suspension member manufacturing method according to claim 4, wherein the hot water flowability of the portion where the wall thickness is reduced is controlled by the oil temperature adjusting means of the mold. This is ensured by heating, and the cooling property of the part with the increased thickness is ensured by cooling with a water cooling means of the mold.
According to the present invention, the hot water flowability of the portion with the small wall thickness is ensured by heating by the oil temperature adjusting means of the mold, and the hot water is formed in the portion of the suspension member while forming the thin wall portion. It becomes possible to prevent the occurrence of flow failure. In addition, since the cooling property of the part having a large thickness is ensured by the water cooling means of the mold, the part having a large thickness is formed on the suspension member, the cooling rate of the part is increased, and die casting is performed. The effect of improving production efficiency by the law can be fully enjoyed.

また、本発明の請求項６に係るサスペンションメンバーの製造方法は、請求項４または５記載のサスペンションメンバーの製造方法において、前記高温成形部位の金型温度を200℃以上とし、前記低温成形部位の金型温度を180℃以下としたことを特徴とするものである。
本発明によれば、前記油温調手段により加熱される部位の金型温度を200℃以上に設定することで、サスペンションメンバーに肉厚の小さい部位を構成しつつ、かかる部位に湯流れ不良が発生することを防ぐことが可能となる。また、前記水冷却手段により冷却される部位の金型温度を180℃以下に設定することで、サスペンションメンバーに肉厚の大きい部位を構成しつつ、かかる部位の冷却速度を高め、ダイカスト鋳造法による生産効率向上の効果を十分に享受することができる。 A suspension member manufacturing method according to claim 6 of the present invention is the suspension member manufacturing method according to claim 4 or 5, wherein the mold temperature of the high-temperature forming portion is 200 ° C. or more, and The mold temperature is set to 180 ° C. or lower.
According to the present invention, by setting the mold temperature of the part heated by the oil temperature adjusting means to 200 ° C. or higher, the suspension member forms a part with a small wall thickness, and there is no hot water flow in the part. It is possible to prevent the occurrence. Further, by setting the mold temperature of the part cooled by the water cooling means to 180 ° C. or less, the suspension member has a thick part while increasing the cooling rate of the part, and by the die casting method. The effect of improving production efficiency can be fully enjoyed.

本発明はこのように構成したので、サスペンションメンバーをダイカスト鋳造法によって成形することによって生産性を向上させ、かつ、必要な部位に必要な伸び若しくは強度を確保することで、成形後の熱処理も不要とした、高機能かつ低コストのアルミニウム合金製サスペンションメンバーを提供することが可能となる   Since the present invention is configured as described above, the suspension member is molded by a die casting method to improve productivity, and by securing the necessary elongation or strength at a necessary portion, no heat treatment after molding is required. It is possible to provide a high-performance and low-cost aluminum alloy suspension member.

以下、本発明の実施の形態を添付図面に基づいて説明する。なお、従来技術と同一部位若しくは相当する部位については同一符号で示し、詳しい説明を省略する。   Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In addition, about the same site | part as a prior art, or an equivalent site | part, it shows with the same code | symbol and abbreviate | omits detailed description.

図１（ａ）には、本発明の実施の形態に係るサスペンションメンバー６の右側面図を、図１（ｂ）には同上面図を示している。また、図２(ａ)には、図１（ａ）、（ｂ）に示すサスペンションメンバー６の前面図を、図２（ｂ）には同裏面図を、図２（ｃ）には同後面図を示している。
サスペンションメンバー６は、車体衝突時には、所定の部位が大きく変形してその衝撃を十分に吸収し、キャビンへのダメージを軽減する一方、サスペンションアーム取付部６ａのような、車両走行時に複雑な力を受ける部位には、十分な強度が与えられた、高機能型サスペンションメンバーである。本発明の実施の形態では、サスペンションメンバー６の材料に、比較的高い強度や伸びを確保し、かつ、使用環境下での耐腐食性にも優れたＪＩＳ−ＡＣ４ＣＨ合金を用いる。ＪＩＳ−ＡＣ４ＣＨ合金はＦｅ成分が少なく金型に焼き付き易いため、一般的には重力鋳造法や低圧鋳造法に用いる材料であるが、本発明の実施の形態では、これをダイカスト鋳造法に用いている。 1A shows a right side view of the suspension member 6 according to the embodiment of the present invention, and FIG. 1B shows a top view thereof. 2A is a front view of the suspension member 6 shown in FIGS. 1A and 1B, FIG. 2B is a rear view thereof, and FIG. 2C is a rear view thereof. The figure is shown.
In the case of a vehicle collision, the suspension member 6 greatly deforms a predetermined part and sufficiently absorbs the impact to reduce the damage to the cabin. On the other hand, the suspension member 6 applies a complex force during vehicle traveling, such as the suspension arm attachment portion 6a. The receiving part is a high-performance suspension member given sufficient strength. In the embodiment of the present invention, the material of the suspension member 6 is a JIS-AC4CH alloy that ensures relatively high strength and elongation and is excellent in corrosion resistance under the usage environment. Since JIS-AC4CH alloy has few Fe components and is easy to seize on a mold, it is generally a material used for a gravity casting method or a low pressure casting method. However, in the embodiment of the present invention, this is used for a die casting method. Yes.

図１（ｂ）、図２（ｂ）において、符号Ａ1、Ａ2、Ａ3で示した部位については、サスペンションメンバー６全体の中で、衝撃に対する伸びを確保するために肉厚を小さくした部位である。また、その他の部位、特にサスペンションアーム取付部６ａのような、車両走行時に複雑な力を受ける部位の肉厚は大きくして、高い強度を確保している。そして、Ａ1、Ａ2、Ａ3で示した部位については４ｍｍ以下の肉厚とすることが好ましく、その他の部分については６ｍｍ以上の肉厚に設定することが好ましい。これは、図４に示す実験結果に基づき決定された値である。
図４には、サスペンションメンバー６の各部の肉厚を変更した場合における、肉厚に対する引張り強さ（ＭＰａ）の関係を符号（ｉ）で、肉厚に対する伸び（％）の関係を符号（ii）で、肉厚に対する０．２％耐力（０．２％歪み時の強度。一般的には弾性限界と同等の扱い。）の関係を符号（iii）で、夫々示している。図４から明らかなように、肉厚に対する伸び（ii）は、肉厚６mm以下とすることで、高い伸び性を確保することが可能である。一方、肉厚に対する引張り強さについても、肉厚を増大させる程低下する傾向にあるが、有効断面積の拡大による強度の向上も考慮すると、肉厚６〜８ｍｍの範囲が、高い強度を得るための最適値となる。
したがって、図１、図２に示すサスペンションメンバー６は、Ａ1、Ａ2、Ａ3で示した部位の肉厚を２．５ｍｍ、その他の部位の肉厚を６〜８ｍｍとしている。 In FIGS. 1B and 2B, the thicknesses of the portions indicated by reference signs A 1 , A 2 , and A 3 are reduced in order to secure the elongation against impact in the entire suspension member 6. It is a part. In addition, the thickness of other portions, particularly the portions that receive a complex force during vehicle travel, such as the suspension arm attachment portion 6a, is increased to ensure high strength. Then, A 1, A 2, preferably set to less thickness 4mm for portions shown by A 3, it is preferable to set the thickness of the above 6mm for other parts. This is a value determined based on the experimental results shown in FIG.
In FIG. 4, when the thickness of each part of the suspension member 6 is changed, the relationship between the tensile strength (MPa) with respect to the thickness is denoted by symbol (i), and the relationship between the elongation (%) with respect to the thickness is denoted by symbol (ii). ), The relationship of 0.2% proof stress (strength at 0.2% strain, generally equivalent to the elastic limit) with respect to the wall thickness is indicated by symbol (iii). As is clear from FIG. 4, the elongation (ii) with respect to the wall thickness can be ensured to have a high elongation by setting the wall thickness to 6 mm or less. On the other hand, the tensile strength against the wall thickness also tends to decrease as the wall thickness is increased. However, in consideration of the improvement of the strength due to the expansion of the effective cross-sectional area, the range of the wall thickness of 6 to 8 mm obtains high strength. It becomes the optimal value for.
Accordingly, in the suspension member 6 shown in FIGS. 1 and 2, the thicknesses of the portions indicated by A 1 , A 2 , and A 3 are 2.5 mm, and the thicknesses of the other portions are 6 to 8 mm.

また、図３には、サスペンションメンバー６と共に、サスペンションメンバー６を鋳造するダイカスト金型の、方案部７、所定の温度に加熱された油を金型内に循環させる油温調回路８（油温調手段）および、所定の温度に冷却された水を金型内に循環させる水冷却回路９（水冷却手段）を示している。そして、符号Ａ1、Ａ2、Ａ3で示した、肉厚を小さくした部位については、鋳造の際に、油温調回路８によって比較的高温へと温度制御される。一方、サスペンションアーム取付部６ａのような、肉厚を大きくした部位については、鋳造の際に、水冷却回路９によって比較的低温へと温度制御される。
図示のサスペンションメンバー６の場合には、具体的な成形条件として、コールドチャンバー式２５００トンダイカストマシンを用い、かつ、肉厚を小さくした部位の金型温度が２００℃以上となるように油温調回路８を調整し、肉厚を大きくした部位の金型温度が１８０℃以下となるように水冷却回路９を調整する。そして、溶湯温度は、肉厚を小さくした部位における湯流れ性を考慮して６８０℃とし、射出速度３．０ｍ／Ｓで鋳造を行う。
なお、金型を加熱するための手段としては、油温調回路８のみならず電気ヒータ等を用いることも可能であるが、その場合には、水冷却回路９との関係で漏電対策を十分に施す必要がある。 FIG. 3 shows a plan portion 7 of a die casting mold for casting the suspension member 6 together with the suspension member 6, and an oil temperature adjusting circuit 8 (oil temperature control circuit) for circulating oil heated to a predetermined temperature in the mold. And a water cooling circuit 9 (water cooling means) for circulating water cooled to a predetermined temperature in the mold. Then, indicated by reference numeral A 1, A 2, A 3 , for small to site the wall thickness, during the casting, is temperature-controlled to a relatively high temperature by the oil temperature control circuit 8. On the other hand, the temperature of a portion having a large thickness, such as the suspension arm attachment portion 6a, is controlled to a relatively low temperature by the water cooling circuit 9 during casting.
In the case of the suspension member 6 shown in the drawing, as specific molding conditions, a cold chamber type 2500-ton die casting machine is used, and the oil temperature is adjusted so that the mold temperature of the part where the wall thickness is reduced is 200 ° C. or more. The circuit 8 is adjusted, and the water cooling circuit 9 is adjusted so that the mold temperature at the portion where the wall thickness is increased is 180 ° C. or less. Then, the molten metal temperature is set to 680 ° C. in consideration of the flowability of molten metal in the portion where the thickness is reduced, and casting is performed at an injection speed of 3.0 m / S.
As a means for heating the mold, it is possible to use not only the oil temperature control circuit 8 but also an electric heater or the like, but in that case, sufficient measures against electric leakage are taken in relation to the water cooling circuit 9. It is necessary to apply to.

さらに、サスペンションメンバー６の材料としては、ＪＩＳ−ＡＣ４ＣＨ合金の他にも、Ａｌ−Ｓｉ−Ｍｇ系合金であって、Ｓｉ量が６．５〜１１．５％の範囲、Ｍｇ量が０．１〜０．８％の範囲であれば、何れも適用可能である。   Furthermore, as a material of the suspension member 6, in addition to the JIS-AC4CH alloy, an Al—Si—Mg-based alloy having a Si content of 6.5 to 11.5% and a Mg content of 0.1. As long as it is in the range of -0.8%, any can be applied.

上記構成をなす、本発明の実施の形態により得られる作用効果は、以下の通りである。まず、本発明の実施の形態に係るサスペンションメンバーの製造方法によれば、衝撃に対する伸びを必要とする部位Ａ1、Ａ2、Ａ3の肉厚を小さくて（２．５ｍｍ）比較的高温（２００℃以上）で成形する一方、サスペンションアーム取付部６ａのような高い強度を必要とする部位の肉厚を大きくして（６〜８ｍｍ）、比較的低温（１８０℃以下）で成形している。
このように、衝撃に対する伸びを必要とする部位Ａ1、Ａ2、Ａ3の肉厚を小さくすることで、図４に符号（ii）で示すように、衝撃に対する必要な伸びを確保することが可能となる。また、当該肉厚を小さくした部位を比較的高温で成形することで、鋳造時における湯流れ不良の発生を抑えることが可能となる。さらに、比較的高温で成形することによって、製品表面におけるチル層（Ｓｉ層）の形成を防ぎ、伸び性の低下を回避することができる。このようにして肉厚を薄くした部位を成形することにより、かかる部位に、熱処理を施すことなく必要な伸び性（低圧鋳造法によるサスペンションメンバーにＴ６処理を施した場合と同等の伸び性）を確保することができる。
一方、サスペンションアーム取付部６ａのような高い強度を必要とする部位の肉厚を大きくし低温で成形することで、図４に符号（ｉ）で示すように、必要な強度を確保しつつ当該肉厚を大きくした部位の溶湯の冷却を促し、ダイカスト鋳造法による生産効率向上の効果を十分に享受することができる。 The effects obtained by the embodiment of the present invention having the above-described configuration are as follows. First, according to the method for manufacturing a suspension member according to the embodiment of the present invention, the thicknesses of the portions A 1 , A 2 , A 3 that need to be stretched against impact are reduced (2.5 mm) at a relatively high temperature ( 200 ° C or higher), while the thickness of the portion requiring high strength, such as the suspension arm attachment portion 6a, is increased (6 to 8 mm) and molded at a relatively low temperature (180 ° C or lower). .
As described above, by reducing the thickness of the portions A 1 , A 2 , and A 3 that need to be stretched with respect to the impact, the necessary stretch with respect to the impact is secured as shown by reference numeral (ii) in FIG. Is possible. Moreover, it becomes possible to suppress generation | occurrence | production of the hot water flow defect at the time of casting by shape | molding the site | part which reduced the said thickness at comparatively high temperature. Furthermore, by forming at a relatively high temperature, it is possible to prevent the formation of a chill layer (Si layer) on the product surface and avoid a decrease in extensibility. In this way, by forming a portion with a reduced thickness, the necessary elongation (elongation equivalent to the case where T6 treatment is applied to the suspension member by low pressure casting method) is performed on such a portion without performing heat treatment. Can be secured.
On the other hand, by increasing the thickness of a portion that requires high strength, such as the suspension arm attachment portion 6a, and molding it at a low temperature, as shown by symbol (i) in FIG. Cooling of the molten metal at the part where the wall thickness is increased is promoted, and the effect of improving the production efficiency by the die casting method can be fully enjoyed.

また、肉厚を小さくした部位Ａ1、Ａ2、Ａ3の湯流れ性を、金型の油温調手段８によって加熱することにより確保し、サスペンションアーム取付部６ａ等、肉厚を大きくした部位の冷却性を、金型の水冷却手段９によって冷却することにより確保することで、上述した作用効果を得ることが可能となる。 Further, the hot water flowability of the parts A 1 , A 2 , A 3 with the reduced thickness is ensured by heating with the oil temperature control means 8 of the mold, and the thickness of the suspension arm mounting portion 6a, etc. is increased. By ensuring the cooling performance of the part by cooling with the water cooling means 9 of the mold, the above-described effects can be obtained.

なお、油温調手段８により加熱される部位の金型温度を200℃以上に設定することで、サスペンションメンバーに肉厚の小さい部位を構成しつつ、係る部位に湯流れ不良の発生を防止し、製品表面のチル層の形成を回避することが可能となる。また、水冷却手段９により冷却される部位の金型温度を180℃以下に設定することで、サスペンションメンバーに肉厚の大きい部位を構成しつつ、係る部位の冷却速度を高め、ダイカスト鋳造法による生産効率向上の効果を十分に享受することができる。   In addition, by setting the mold temperature of the part heated by the oil temperature adjusting means 8 to 200 ° C. or more, it is possible to prevent a hot water flow defect from occurring in such a part while forming a thin part in the suspension member. It is possible to avoid the formation of a chill layer on the product surface. Further, by setting the mold temperature of the portion cooled by the water cooling means 9 to 180 ° C. or less, the suspension member is configured to have a large thickness portion, while increasing the cooling rate of the portion, and by the die casting method. The effect of improving production efficiency can be fully enjoyed.

以上の方法によって製造されたサスペンションメンバー６は、生産性が向上することや、成形後の熱処理が不要であることによるコスト低減効果が大きく、かつ、必要な部位に必要な伸び若しくは強度を確保した、高機能型アルミニウム合金製サスペンションメンバーとなる。よって、自動車の軽量化、低コスト化、高強度化、安全性の更なる向上に貢献するものとなる。また、熱処理を不要とすることによる、製造時の地球環境的なエネルギー低減に貢献することが可能となる。   The suspension member 6 manufactured by the above method has a significant cost reduction effect due to the improvement of productivity and the need for heat treatment after molding, and the necessary elongation or strength is ensured in a necessary part. A suspension member made of high-performance aluminum alloy. Therefore, it contributes to further weight reduction, cost reduction, higher strength, and safety of automobiles. Moreover, it becomes possible to contribute to energy reduction of the global environment at the time of manufacture by making heat treatment unnecessary.

本発明の実施の形態に係るサスペンションメンバーの右側面図を（ａ）に、同上面図を（ｂ）示している。A right side view of the suspension member according to the embodiment of the present invention is shown in (a), and a top view thereof is shown in (b). 図１（ａ）、（ｂ）に示すサスペンションメンバーの前面図を(ａ)に、同裏面図を（ｂ）に、同後面図を（ｃ）に示している。A front view of the suspension member shown in FIGS. 1 (a) and 1 (b) is shown in (a), a rear view thereof is shown in (b), and a rear view thereof is shown in (c). サスペンションメンバーと共に、サスペンションメンバーを鋳造するダイカスト金型の、方案部、油温調回路および水冷却回路を示したものである。A plan part, an oil temperature control circuit, and a water cooling circuit of a die casting mold for casting the suspension member together with the suspension member are shown. 肉厚に対する、引張り強さ、伸び、０．２％耐力の各関係示すグラフである。It is a graph which shows each relationship of tensile strength with respect to thickness, elongation, and 0.2% yield strength. サスペンションメンバーを使用したフロントサスペンション構造の一例を示す斜視図である。It is a perspective view which shows an example of the front suspension structure which uses a suspension member.

符号の説明Explanation of symbols

６：サスペンションメンバー、６ａ：サスペンションアーム取付部、７：方案部、８：油温調整回路、９：水冷却回路、Ａ1、Ａ2、Ａ3：肉厚を小さくした部位
6: Suspension member, 6a: Suspension arm mounting part, 7: Plan part, 8: Oil temperature adjustment circuit, 9: Water cooling circuit, A 1 , A 2 , A 3 : Parts with reduced thickness

Claims (6)

アルミニウム合金のダイカスト製サスペンションメンバーであって、肉厚が小さくかつ比較的高温で成形され、衝撃に対する伸びが確保された部位と、肉厚が大きくかつ比較的低温で成形され、高い強度が確保された部位とを備えることを特徴とするサスペンションメンバー。 This is an aluminum alloy die-cast suspension member that has a small wall thickness and is molded at a relatively high temperature, and has secured a portion that has been stretched against impact, and a large wall thickness that is molded at a relatively low temperature, ensuring high strength. A suspension member characterized by comprising 前記肉厚が小さい部位の湯流れ性が金型の油温調手段によって確保され、前記肉厚が大きい部位の冷却性が金型の水冷却手段によって確保されてなることを特徴とする請求項１記載のサスペンションメンバー。 The hot water flowability of the portion with the small thickness is ensured by the oil temperature adjusting means of the mold, and the cooling performance of the portion with the large thickness is ensured by the water cooling means of the mold. The suspension member according to 1. 前記高温成形部位に係る金型温度が前記油温調手段により200℃以上に設定され、前記低温成形部位に係る金型温度が前記水冷却手段により180℃以下に設定されてなることを特徴とする請求項１または２記載のサスペンションメンバー。 The mold temperature related to the high temperature molding part is set to 200 ° C. or higher by the oil temperature adjusting means, and the mold temperature related to the low temperature molding part is set to 180 ° C. or lower by the water cooling means. The suspension member according to claim 1 or 2. アルミニウム合金のダイカスト製サスペンションメンバーの製造方法であって、衝撃に対する伸びを必要とする部位の肉厚を小さくて比較的高温で成形し、高い強度を必要とする部位の肉厚を大きくして比較的低温で成形することを特徴とするサスペンションメンバーの製造方法。 A method of manufacturing a die cast suspension member made of an aluminum alloy, where the thickness of the part requiring elongation to impact is reduced and molded at a relatively high temperature, and the thickness of the part requiring high strength is increased and compared. A method for producing a suspension member, characterized by forming at a low temperature. 前記肉厚を小さくした部位の湯流れ性を、金型の油温調手段によって加熱することにより確保し、前記肉厚を大きくした部位の冷却性を、金型の水冷却手段によって冷却することにより確保したことを特徴とする請求項４記載のサスペンションメンバーの製造方法。 The hot water flowability of the part with the reduced thickness is ensured by heating by the oil temperature adjusting means of the mold, and the cooling property of the part with the increased thickness is cooled by the water cooling means of the mold. The suspension member manufacturing method according to claim 4, wherein the suspension member is secured by the following. 前記高温成形部位の金型温度を200℃以上とし、前記低温成形部位の金型温度を180℃以下としたことを特徴とする請求項４または５記載のサスペンションメンバーの製造方法。
6. The method of manufacturing a suspension member according to claim 4, wherein a mold temperature of the high temperature forming portion is 200 ° C. or higher and a mold temperature of the low temperature forming portion is 180 ° C. or lower.
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JP2006347348A (en) * 2005-06-15 2006-12-28 Honda Motor Co Ltd Structure
JP2009505889A (en) * 2005-09-13 2009-02-12 カーエスエム キャスティングス ゲーエムベーハー Auxiliary frame, more preferably an auxiliary frame for automobiles
JP2009507694A (en) * 2005-09-13 2009-02-26 カーエスエム キャスティングス ゲーエムベーハー Front axle bracket, especially front axle bracket for automobile
US9216775B2 (en) 2012-07-27 2015-12-22 Honda Motor Co., Ltd. Subframe for vehicle
US11572101B2 (en) 2021-03-29 2023-02-07 Honda Motor Co., Ltd. Sub-frame
US12043312B2 (en) 2021-03-29 2024-07-23 Honda Motor Co., Ltd. Subframe

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006347348A (en) * 2005-06-15 2006-12-28 Honda Motor Co Ltd Structure
JP4676257B2 (en) * 2005-06-15 2011-04-27 本田技研工業株式会社 Sub-frame
JP2009505889A (en) * 2005-09-13 2009-02-12 カーエスエム キャスティングス ゲーエムベーハー Auxiliary frame, more preferably an auxiliary frame for automobiles
JP2009507694A (en) * 2005-09-13 2009-02-26 カーエスエム キャスティングス ゲーエムベーハー Front axle bracket, especially front axle bracket for automobile
US7938414B2 (en) 2005-09-13 2011-05-10 Ksm Castings Gmbh Auxiliary frame, particularly for motor vehicles
JP4856705B2 (en) * 2005-09-13 2012-01-18 カーエスエム キャスティングス ゲーエムベーハー Auxiliary frame, more preferably an auxiliary frame for automobiles
US8393627B2 (en) 2005-09-13 2013-03-12 Ksm Castings Group Gmbh Longitudinal link for an auxiliary frame, particularly for motor vehicles
US9216775B2 (en) 2012-07-27 2015-12-22 Honda Motor Co., Ltd. Subframe for vehicle
US11572101B2 (en) 2021-03-29 2023-02-07 Honda Motor Co., Ltd. Sub-frame
US12043312B2 (en) 2021-03-29 2024-07-23 Honda Motor Co., Ltd. Subframe

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