WO2012090761A1 - Light cast-iron product - Google Patents
Light cast-iron product Download PDFInfo
- Publication number
- 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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- WIPO (PCT)
- Prior art keywords
- cast iron
- iron product
- cast
- product
- melting point
- Prior art date
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Classifications
-
- 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)
- Heat Treatment Of Articles (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
Description
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.
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.
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.
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%.
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.
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)
- 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.
- 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.
- 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.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012550845A JP5265053B2 (en) | 2010-12-27 | 2011-12-19 | Lightweight cast iron products |
US13/976,239 US20130284320A1 (en) | 2010-12-27 | 2011-12-19 | Lightweight cast-iron product |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2010-290847 | 2010-12-27 | ||
JP2010290847 | 2010-12-27 |
Publications (1)
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WO2012090761A1 true WO2012090761A1 (en) | 2012-07-05 |
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Application Number | Title | Priority Date | Filing Date |
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PCT/JP2011/079367 WO2012090761A1 (en) | 2010-12-27 | 2011-12-19 | Light cast-iron product |
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US (1) | US20130284320A1 (en) |
JP (1) | JP5265053B2 (en) |
WO (1) | 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 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
-
2011
- 2011-12-19 WO PCT/JP2011/079367 patent/WO2012090761A1/en active Application Filing
- 2011-12-19 JP JP2012550845A patent/JP5265053B2/en active Active
- 2011-12-19 US US13/976,239 patent/US20130284320A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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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JPWO2012090761A1 (en) | 2014-06-05 |
JP5265053B2 (en) | 2013-08-14 |
US20130284320A1 (en) | 2013-10-31 |
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