WO2012090761A1 - Light cast-iron product - Google Patents

Light cast-iron product Download PDF

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WO2012090761A1
WO2012090761A1 PCT/JP2011/079367 JP2011079367W WO2012090761A1 WO 2012090761 A1 WO2012090761 A1 WO 2012090761A1 JP 2011079367 W JP2011079367 W JP 2011079367W WO 2012090761 A1 WO2012090761 A1 WO 2012090761A1
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cast iron
iron product
cast
product
melting point
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PCT/JP2011/079367
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French (fr)
Japanese (ja)
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康史 浅田
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株式会社浅田可鍛鋳鉄所
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Priority to US13/976,239 priority Critical patent/US20130284320A1/en
Priority to JP2012550845A priority patent/JP5265053B2/en
Publication of WO2012090761A1 publication Critical patent/WO2012090761A1/en

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D10/00—Modifying the physical properties by methods other than heat treatment or deformation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D25/00—Special casting characterised by the nature of the product
    • B22D25/02—Special casting characterised by the nature of the product by its peculiarity of shape; of works of art
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/08—Alloys with open or closed pores
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/08—Alloys with open or closed pores
    • C22C1/083—Foaming process in molten metal other than by powder metallurgy
    • C22C1/087—Foaming process in molten metal other than by powder metallurgy after casting in solidified or solidifying metal to make porous metals
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/10—Alloys containing non-metals
    • C22C1/1089—Alloys containing non-metals by partial reduction or decomposition of a solid metal compound

Definitions

  • the present invention relates to a light weight cast iron product and a method of manufacturing the product.
  • cast iron products are used in the main body and parts of automobiles and medium and large machinery. These cast iron products are used for parts that require strength and heat resistance in comparison to plastics, and parts that are complex in shape and low cost are required in comparison with other metals including steel. It is used in many fields where performance is required anyway. However, as plastics and other metals have undergone technical development in various functions and their superiority over these functions has gradually eroded, cast iron products are also expected to develop technically in line with the times.
  • Patent Document 1 The automobile industry is one of the major fields of application of cast iron products, but weight reduction has always been a major issue. Of course, weight reduction is an eternal issue in other fields of use. In response to this, the present inventor gave a revolutionary answer to hollow cast iron products (Patent Document 1).
  • Patent Document 1 The cast iron product described in Patent Document 1 has made great progress in terms of weight reduction, but the strength is sufficient compared to plastic products, but it is still hollow, and the conventional cast iron In many cases, it was not enough to replace the parts that had been used.
  • the problem to be solved by the present invention is to provide a cast iron product that satisfies both the requirements of light weight and high strength in a well-balanced manner.
  • the light weight cast iron product according to the present invention which has been made to solve the above-mentioned problems, has a surface layer portion whose shell has been increased in melting point by decarburization as a shell, and a honeycomb structure on the inside.
  • the manufacturing method of such cast iron products is: a) a decarburization step of forming a decarburization layer on the surface of the cast iron product made of hypoeutectic cast iron by heating; b) an outflow hole forming step for forming an outflow hole penetrating to the inside of the decarburized layer; c) Heating the cast iron product to a temperature lower than the melting point of the decarburized layer and higher than the melting point of the hypoeutectic cast iron inside while holding the cast iron product so that the outflow hole is located at the bottom. And an elution step.
  • the above-described process according to the present invention is basically similar to the process described in Patent Document 1, but is greatly different from that in the cast iron part described in Claim 1 of Patent Document 1 in particular in its material. However, in the present invention, it is limited to “made of hypoeutectic cast iron”. In addition, in the cast iron part described in claim 3 of Patent Document 1, “having a eutectic carbon concentration”, the method according to the present invention is completely different from the invention described in Patent Document 1 in this respect. Yes.
  • the non-decarburized portion (inside), that is, hypoeutectic cast iron, is completely formed in the elution step of c). Does not melt, and part of the dendritic ⁇ phase having a high melting point remains in a lattice shape. Therefore, the interior (non-decarburized portion) is not completely hollow like the cast iron part described in Patent Document 1, but a honeycomb shape is formed in that portion. Of course, the effect of weight reduction is somewhat reduced by that amount, but the strength is sufficiently stronger than the complete hollow state. That is, the cast iron product manufactured by the method according to the present invention is a cast iron product that satisfies both the requirements of light weight and high strength in a balanced manner.
  • FIG. The main chemical composition of the cast iron product 1 which is Example 1.
  • the main chemical composition of the cast iron product 2 which is Example 2.
  • the first example is a bearing cap as shown in FIG.
  • the chemical components are shown in FIG.
  • the CE value of the material of the cast iron product (hereinafter referred to as cast iron product 1) of this example is 4.03, which is hypoeutectic.
  • cast iron product 1 is placed in the same electric heating furnace so that the outflow hole is at the bottom, and the furnace is heated to 1185 ° C. over 50 minutes with N 2 gas atmosphere. Hold for a minute.
  • the furnace was cooled to 500 ° C. in the same N 2 atmosphere, and then allowed to cool in the air.
  • disconnected in the thickness direction center of the cast iron component 1 used as normal temperature is shown in FIG. It can be seen that the inside of the decarburized layer with a thickness of about 3 mm has a honeycomb shape inside.
  • the weight of the cast iron part 1 before the above treatment was 370 gr (grams), but after the treatment, it was 315 gr, and the weight reduction rate was 15%.
  • the second example is an oil pump cover.
  • the cast iron product of this embodiment (hereinafter referred to as cast iron product 2) is a disk-shaped part with an outer diameter of 185mm having a hole with a diameter of 45mm in the center, and a rim with a thickness of 28mm is provided around the center hole. The thickness at the part is 21 mm.
  • the mass of the cast iron product 2 before processing is 3.45 kg, which is about 9 times the mass of the cast iron product 1.
  • the chemical composition of the material is as shown in FIG. 5, and its CE value is 4.11 (hypereutectic).
  • cast iron product 2 is placed in the same electric heating furnace so that both outflow holes are at the bottom, and the furnace is heated to 1190 ° C over 60 minutes with N2 gas atmosphere. Hold for 12 minutes. As described above, when the cast iron product 2 reached its temperature, the molten metal began to flow out of the outflow hole, and the outflow almost stopped after a holding time of 12 minutes. The furnace was cooled to 500 ° C. in the same N 2 atmosphere, and then allowed to cool in the air.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
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Abstract

Provided is a cast-iron product that satisfies demands for both weight reduction and strength enhancement with good balance. A cast ion product having an internal honeycomb structure is manufactured by means of: a decarburizing process in which a cast-iron product comprising hypoeutectic cast iron is heated to form a decarburized layer on the surface of the cast-iron product; an outflow-hole forming process in which an outflow hole is formed penetrating further inside than the decarburized layer; and a liquation process in which the cast-iron product is heated to a temperature lower than the melting point of the decarburized layer but higher than the melting point of the hypoeutectic cast iron in a state where the cast-iron product is held in a position such that the outflow hole is positioned in the lower part thereof.

Description

軽量化鋳鉄製品Lightweight cast iron products
　本発明は、軽量化鋳鉄製品及び該製品を製造する方法に関する。 The present invention relates to a light weight cast iron product and a method of manufacturing the product.
　自動車を始め、中・大型機械装置の本体や部品には多くの鋳鉄製品が使用されている。これらの鋳鉄製品は、プラスチックとの比較で言えば強度や耐熱性が必要な部分等に用いられ、鋼を含む他の金属との比較で言えば形状が複雑である部分や低コストが要求される部分に用いられ、いずれにせよそれらの性能が求められる多くの分野で使用されている。しかし、プラスチックや他の金属が様々な機能において技術的発展を遂げ、それらに対する優位性が徐々に浸食される中で、鋳鉄製品においても時代に即応した技術的発展が期待されている。 Many cast iron products are used in the main body and parts of automobiles and medium and large machinery. These cast iron products are used for parts that require strength and heat resistance in comparison to plastics, and parts that are complex in shape and low cost are required in comparison with other metals including steel. It is used in many fields where performance is required anyway. However, as plastics and other metals have undergone technical development in various functions and their superiority over these functions has gradually eroded, cast iron products are also expected to develop technically in line with the times.
　鋳鉄製品の大きな利用分野の一つに自動車産業があるが、そこでは軽量化が常に大きな課題となっている。もちろん、他の利用分野においても軽量化は永遠の課題である。本件発明者はこれに対し、中空鋳鉄製品という画期的な解答を与えた（特許文献１）。 The automobile industry is one of the major fields of application of cast iron products, but weight reduction has always been a major issue. Of course, weight reduction is an eternal issue in other fields of use. In response to this, the present inventor gave a revolutionary answer to hollow cast iron products (Patent Document 1).
特許第4099535号公報Japanese Patent No. 4099535
　特許文献１に記載の鋳鉄製品は、軽量化という点に関して大きな進歩を遂げたものであるが、強度に関しては、プラスチック製品と比較すると十分な強度を持つものの、やはり中空ということもあり、従来鋳鉄を使用していた部品に置き換えるには不十分な場合も多かった。 The cast iron product described in Patent Document 1 has made great progress in terms of weight reduction, but the strength is sufficient compared to plastic products, but it is still hollow, and the conventional cast iron In many cases, it was not enough to replace the parts that had been used.
　そこで、本発明が解決しようとする課題は、軽量化と高強度の双方の要求をバランス良く満たした鋳鉄製品を提供することである。 Therefore, the problem to be solved by the present invention is to provide a cast iron product that satisfies both the requirements of light weight and high strength in a well-balanced manner.
　上記課題を解決するために成された本発明に係る軽量化鋳鉄製品は、脱炭処理により融点を上昇させた表層部を殻とし、その内側をハニカム状としたものである。 The light weight cast iron product according to the present invention, which has been made to solve the above-mentioned problems, has a surface layer portion whose shell has been increased in melting point by decarburization as a shell, and a honeycomb structure on the inside.
　そのような鋳鉄製品の製造方法は、
　a) 亜共晶鋳鉄から成る鋳鉄製品を加熱することによりその表面に脱炭層を形成する脱炭工程と、
　b) 該脱炭層よりも内部まで貫通する流出孔を形成する流出孔形成工程と、
　c) 該流出孔が下部に位置するように前記鋳鉄製品を保持した状態で該鋳鉄製品を、前記脱炭層の融点よりも低く、内部の前記亜共晶鋳鉄の融点よりも高い温度に加熱する溶出工程と
　を備えることを特徴とする。 The manufacturing method of such cast iron products is:
a) a decarburization step of forming a decarburization layer on the surface of the cast iron product made of hypoeutectic cast iron by heating;
b) an outflow hole forming step for forming an outflow hole penetrating to the inside of the decarburized layer;
c) Heating the cast iron product to a temperature lower than the melting point of the decarburized layer and higher than the melting point of the hypoeutectic cast iron inside while holding the cast iron product so that the outflow hole is located at the bottom. And an elution step.
　なお、上記において「亜共晶鋳鉄」とは、その炭素等量CEが次の式(1)を満たす組成を有することを言う（式中の%は重量%）。
　　2.0 < CE = C% + (Si% + P%)/3 < 4.3　　…(1)
　CEがこの範囲内の値であれば、その融点は炭素等量に拘わらずほぼ1147℃で一定である。従って、上記c)工程における加熱温度は、概ね、その融点（1147℃）からそれより50℃程度高い温度、すなわち、1147～1200℃の範囲内とすることが望ましい。なお、脱炭層における炭素濃度を1%以下にしておけば、その部分（脱炭層）の融点は1350℃程度となる。 In the above, “hypoeutectic cast iron” means that the carbon equivalent CE has a composition satisfying the following formula (1) (% in the formula is wt%).
2.0 <CE = C% + (Si% + P%) / 3 <4.3… (1)
If CE is within this range, its melting point is constant at approximately 1147 ° C regardless of the carbon equivalent. Accordingly, it is desirable that the heating temperature in the above step c) is approximately 50 ° C. higher than the melting point (1147 ° C.), that is, within the range of 1147 to 1200 ° C. If the carbon concentration in the decarburized layer is 1% or less, the melting point of the portion (decarburized layer) is about 1350 ° C.
　本願発明に係る上記工程は、基本的には特許文献１に記載の工程と類似しているが、それと大きく異なるのは、特許文献１の請求項１に記載の鋳鉄部品ではその素材を特に限定せず、単に「鋳鉄部品」としているのに対し、本願発明では「亜共晶鋳鉄から成る」ものに限定した点である。なお、特許文献１の請求項３に記載の鋳鉄部品では「共晶炭素濃度を有する」としており、本願発明に係る方法はこの点において特許文献１に記載の発明とは全く異なるものとなっている。 The above-described process according to the present invention is basically similar to the process described in Patent Document 1, but is greatly different from that in the cast iron part described in Claim 1 of Patent Document 1 in particular in its material. However, in the present invention, it is limited to “made of hypoeutectic cast iron”. In addition, in the cast iron part described in claim 3 of Patent Document 1, “having a eutectic carbon concentration”, the method according to the present invention is completely different from the invention described in Patent Document 1 in this respect. Yes.
　本願発明では、このように素材として亜共晶鋳鉄を用いるため、図１の状態図から明らかなように、c)の溶出工程において非脱炭部（内部）、すなわち亜共晶鋳鉄、が完全には溶融せず、融点の高いデンドライト状のγ相の一部が格子状に残存する。従って、特許文献１に記載の鋳鉄部品のように内部（非脱炭部）が完全な中空になるのではなく、その部分においてハニカム状となる。もちろん、その分だけ軽量化の効果は多少減殺されているが、強度的には、完全な中空状態よりも十分に強いものとなる。すなわち、本発明に係る方法で製造した鋳鉄製品は、軽量化と高強度の双方の要求をバランス良く満たした鋳鉄製品となっている。 In the present invention, since hypoeutectic cast iron is used as the material in this way, as is apparent from the phase diagram of FIG. 1, the non-decarburized portion (inside), that is, hypoeutectic cast iron, is completely formed in the elution step of c). Does not melt, and part of the dendritic γ phase having a high melting point remains in a lattice shape. Therefore, the interior (non-decarburized portion) is not completely hollow like the cast iron part described in Patent Document 1, but a honeycomb shape is formed in that portion. Of course, the effect of weight reduction is somewhat reduced by that amount, but the strength is sufficiently stronger than the complete hollow state. That is, the cast iron product manufactured by the method according to the present invention is a cast iron product that satisfies both the requirements of light weight and high strength in a balanced manner.
鉄－炭素系状態図（Si = 0%の場合）。Iron-carbon phase diagram (when Si = 0%). 実施例１である鋳鉄製品１の外観図。1 is an external view of a cast iron product 1 that is Embodiment 1. FIG. 実施例１である鋳鉄製品１の主要化学組成。The main chemical composition of the cast iron product 1 which is Example 1. FIG. ハニカム化処理後の鋳鉄製品１の断面図。Sectional drawing of the cast iron product 1 after a honey-combination process. 実施例２である鋳鉄製品２の主要化学組成。The main chemical composition of the cast iron product 2 which is Example 2. FIG.
　本発明に係る鋳鉄製品の製造例を２種説明する。 Two types of production of cast iron products according to the present invention will be described.
　第１の例は、図２に示すような軸受のキャップである。その化学成分を図３に示す。図３の最後の欄に示すように、本実施例の鋳鉄製品（以下、鋳鉄製品１と呼ぶ）の素材のCE値は4.03であり、亜共晶である。 The first example is a bearing cap as shown in FIG. The chemical components are shown in FIG. As shown in the last column of FIG. 3, the CE value of the material of the cast iron product (hereinafter referred to as cast iron product 1) of this example is 4.03, which is hypoeutectic.
　鋳鉄製品１を電気式加熱炉により、都市ガスを変成してCO/(CO+CO2)*100=75%となるように調整した変成ガス雰囲気中で1060℃まで加熱し、12時間保持するという脱炭処理を行った。脱炭処理後は雰囲気をN2ガスに変え、500℃まで炉冷し、その後大気中で放冷した。
　常温にした鋳鉄製品１の一箇所（図２のA部）にφ4.5mmのドリルで深さ3mmの孔（流出孔）を穿孔した。 Cast iron product 1 is heated to 1060 ° C in a modified gas atmosphere adjusted to CO / (CO + CO2) * 100 = 75% by transforming city gas with an electric heating furnace and held for 12 hours Decarburization treatment was performed. After decarburization, the atmosphere was changed to N2 gas, furnace-cooled to 500 ° C, and then allowed to cool in the air.
A hole (outflow hole) with a depth of 3 mm was drilled with a φ4.5 mm drill in one place (A part in FIG. 2) of the cast iron product 1 at room temperature.
　その後、同じ電気式加熱炉内に、流出孔が下になるように鋳鉄製品１を置き、炉内をN2ガス雰囲気となるようにして、50分かけて1185℃まで加熱し、その温度で8分間保持した。鋳鉄製品１がその温度に達した時点で前記流出孔より溶湯が流出し始めたが、数分の後、溶湯の流出量が減少し、8分の保持時間後には殆ど流出が止んでいた。同じN2雰囲気中で500℃となるまで炉冷し、その後大気中で放冷した。 Then, cast iron product 1 is placed in the same electric heating furnace so that the outflow hole is at the bottom, and the furnace is heated to 1185 ° C. over 50 minutes with N 2 gas atmosphere. Hold for a minute. When the cast iron product 1 reached its temperature, the molten metal began to flow out of the outflow hole, but after a few minutes, the molten metal flowed out and the flow stopped almost after 8 minutes. The furnace was cooled to 500 ° C. in the same N 2 atmosphere, and then allowed to cool in the air.
　常温になった鋳鉄部品１の厚み方向中央で切断した断面の状態を図４に示す。周辺の厚さ約3mmの脱炭層よりも内部がハニカム状となっているのが見られる。
　上記の処理を行う前の鋳鉄部品１の質量は370gr(グラム)であったが、上記処理後は315grとなっており、軽量化率は15%であった。 The state of the cross section cut | disconnected in the thickness direction center of the cast iron component 1 used as normal temperature is shown in FIG. It can be seen that the inside of the decarburized layer with a thickness of about 3 mm has a honeycomb shape inside.
The weight of the cast iron part 1 before the above treatment was 370 gr (grams), but after the treatment, it was 315 gr, and the weight reduction rate was 15%.
　第２の例は、オイルポンプカバーである。本実施例の鋳鉄製品（以下、鋳鉄製品２と呼ぶ）は中心に径45mmの穴を有する外径185mmの円盤状の部品であり、中心穴周囲には厚さ28mmのリムが設けられ、外周部における厚さは21mmとなっている。鋳鉄製品２の処理前の質量は3.45kgであり、鋳鉄製品１の約9倍の質量を持つ。その素材の化学組成は図５に示すとおりであり、そのCE値は4.11（亜共晶）である。 The second example is an oil pump cover. The cast iron product of this embodiment (hereinafter referred to as cast iron product 2) is a disk-shaped part with an outer diameter of 185mm having a hole with a diameter of 45mm in the center, and a rim with a thickness of 28mm is provided around the center hole. The thickness at the part is 21 mm. The mass of the cast iron product 2 before processing is 3.45 kg, which is about 9 times the mass of the cast iron product 1. The chemical composition of the material is as shown in FIG. 5, and its CE value is 4.11 (hypereutectic).
　鋳鉄製品２の脱炭処理は上記と同じ方法で行った。すなわち、電気式加熱炉で、CO/(CO+CO2)*100=75%とした変成ガス雰囲気中で1060℃まで加熱し、12時間保持した。脱炭処理後は雰囲気をN2ガスに変え、500℃まで炉冷し、その後大気中で放冷した。
　鋳鉄製品２については、φ8のドリルで外周部の２箇所に流出孔を穿孔した。 The decarburization treatment of the cast iron product 2 was performed by the same method as described above. That is, it was heated to 1060 ° C. in a modified gas atmosphere with CO / (CO + CO 2) * 100 = 75% in an electric heating furnace and held for 12 hours. After decarburization, the atmosphere was changed to N2 gas, furnace-cooled to 500 ° C, and then allowed to cool in the air.
For cast iron product 2, outflow holes were drilled at two locations on the outer periphery with a φ8 drill.
　その後、同じ電気式加熱炉内に、両流出孔が下になるように鋳鉄製品２を置き、炉内をN2ガス雰囲気となるようにして、60分かけて1190℃まで加熱し、その温度で12分間保持した。上記同様、鋳鉄製品２がその温度に達した時点で前記流出孔より溶湯が流出し始め、12分の保持時間後には殆ど流出が止んでいた。同じN2雰囲気中で500℃となるまで炉冷し、その後大気中で放冷した。 Then, cast iron product 2 is placed in the same electric heating furnace so that both outflow holes are at the bottom, and the furnace is heated to 1190 ° C over 60 minutes with N2 gas atmosphere. Hold for 12 minutes. As described above, when the cast iron product 2 reached its temperature, the molten metal began to flow out of the outflow hole, and the outflow almost stopped after a holding time of 12 minutes. The furnace was cooled to 500 ° C. in the same N 2 atmosphere, and then allowed to cool in the air.
　常温になった鋳鉄部品２をその径方向に切断し、各部の内部の様子を観察したところ、中心穴のリムの内部、及び、外周側の肉厚部の内部においてハニカム状となっているのが確認された。
　鋳鉄部品２の中空化処理後の質量は2.31kgとなっており、軽量化率は33%であった。 When the cast iron part 2 at room temperature was cut in the radial direction and the inside of each part was observed, it was in a honeycomb shape inside the rim of the center hole and inside the thick part on the outer peripheral side. Was confirmed.
The mass of the cast iron part 2 after being hollowed out was 2.31 kg, and the weight reduction rate was 33%.

Claims (3)

  1. 　脱炭処理により融点を上昇させた表層部を殻とし、その内側をハニカム状としたことを特徴とする軽量化鋳鉄製品。 A lightweight cast iron product characterized in that the surface layer portion whose melting point has been raised by decarburization treatment is used as a shell and the inside is formed into a honeycomb shape.
  2. 　脱炭処理前の鋳鉄の成分が亜共晶炭素濃度を満足する、請求項１に記載の鋳鉄製品。 The cast iron product according to claim 1, wherein a component of cast iron before decarburization treatment satisfies a hypoeutectic carbon concentration.
  3. 　a) 亜共晶鋳鉄から成る鋳鉄製品を加熱することによりその表面に脱炭層を形成する脱炭工程と、
    　b) 該脱炭層よりも内部まで貫通する流出孔を形成する流出孔形成工程と、
    　c) 該流出孔が下部に位置するように前記鋳鉄製品を保持した状態で該鋳鉄製品を、前記脱炭層の融点よりも低く、内部の前記亜共晶鋳鉄の融点よりも高い温度に加熱する溶出工程と
    　を備えることを特徴とする軽量化鋳鉄製品の製造方法。     a) a decarburization step of forming a decarburization layer on the surface of the cast iron product made of hypoeutectic cast iron by heating;
    b) an outflow hole forming step for forming an outflow hole penetrating to the inside of the decarburized layer;
    c) Heating the cast iron product to a temperature lower than the melting point of the decarburized layer and higher than the melting point of the hypoeutectic cast iron inside while holding the cast iron product so that the outflow hole is located at the bottom. A method for producing a lightweight cast iron product, comprising: an elution step.
PCT/JP2011/079367 2010-12-27 2011-12-19 Light cast-iron product WO2012090761A1 (en)

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US11415173B2 (en) * 2018-10-17 2022-08-16 Aktiebolaget Skf Elastomeric bearing having reduced-weight end cap
US11913496B2 (en) 2018-10-17 2024-02-27 Aktiebolaget Skf Elastomeric bearing having carbon-fiber reinforced laminae

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JPS5337958A (en) * 1976-09-21 1978-04-07 Mazda Motor Corp Method of manufacturing filter
JP2005219083A (en) * 2004-02-05 2005-08-18 Akutei:Kk Worked cast iron part and method for working cast iron part
JP2008215331A (en) * 2007-03-08 2008-09-18 Hino Motors Ltd Exhaust port of cylinder head and method for forming same

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JPS63190176A (en) * 1987-01-31 1988-08-05 Toyota Motor Corp Production of cast iron member having superior corrosion resistance
JPH1147906A (en) * 1997-07-29 1999-02-23 Toshiba Mach Co Ltd Erosion resistant hybrid ladle
US6709739B1 (en) * 1999-06-03 2004-03-23 Case Western Reserve University Closed cell metal composites

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JPS5337958A (en) * 1976-09-21 1978-04-07 Mazda Motor Corp Method of manufacturing filter
JP2005219083A (en) * 2004-02-05 2005-08-18 Akutei:Kk Worked cast iron part and method for working cast iron part
JP2008215331A (en) * 2007-03-08 2008-09-18 Hino Motors Ltd Exhaust port of cylinder head and method for forming same

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