WO2004031424A1 - 鋳造鍛造用アルミニウム合金、アルミニウム鋳造鍛造品及び製造方法 - Google Patents
鋳造鍛造用アルミニウム合金、アルミニウム鋳造鍛造品及び製造方法 Download PDFInfo
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- WO2004031424A1 WO2004031424A1 PCT/JP2003/012514 JP0312514W WO2004031424A1 WO 2004031424 A1 WO2004031424 A1 WO 2004031424A1 JP 0312514 W JP0312514 W JP 0312514W WO 2004031424 A1 WO2004031424 A1 WO 2004031424A1
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- forging
- aluminum
- forged product
- aluminum alloy
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Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/05—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys of the Al-Si-Mg type, i.e. containing silicon and magnesium in approximately equal proportions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
- B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/26—Making machine elements housings or supporting parts, e.g. axle housings, engine mountings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K3/00—Making engine or like machine parts not covered by sub-groups of B21K1/00; Making propellers or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
- B22D21/002—Castings of light metals
- B22D21/007—Castings of light metals with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
- C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon
Definitions
- the present invention relates to an aluminum alloy for forging, an aluminum forged product, and a method for producing an aluminum forged product, which is used for a vehicle component or the like, and which is further reduced in cost. More specifically, it is used in the manufacture of undercarriage parts for vehicles that need to be reduced in weight in order to improve the fuel efficiency of automobiles, and can use unnecessary forging materials such as burrs generated in the forging process as raw materials.
- the present invention relates to an aluminum alloy for forging, an aluminum forged product having excellent mechanical properties and containing a specific amount of silicon, magnesium, copper, and manganese, and a method for producing an aluminum forged product. Background art
- Measures to improve automobile fuel efficiency include using new power sources such as fuel cells, natural gas, and electricity, or hybrid use of them, or improving the technology of prime movers such as lean fuel engines and direct injection engines. And power transmission loss improvement and Although there is a reduction in running resistance by improving the body shape, etc., the most effective is the lightweight car with a low vehicle mass that can be used in combination with any other technology. If the vehicle itself is light-weighted, the load on the power source will be reduced, and it will be possible to reduce the amount of use of any power source. As a part of reducing the weight of automobiles, it contributes to the improvement of driving operability and ride comfort of automobiles. Attempts have been made to use light metal materials to reduce the weight of frames and some parts of the engine.
- Lightweight dagger technology is roughly classified into structural design technology and material technology. Compared to the drastic improvement of the vehicle body structure and components, it is easier to change the material used, but it is a lighter means. High cost. Lightening materials include resin materials such as FRP, thinning of iron using high-tensile steel sheets, aluminum alloys, magnesium alloys, titanium alloys, ceramics, and metal composite materials. The weakest is corrosion resistance among others. Among the materials that are less expensive and more expensive than iron, but are lighter than other materials, aluminum alloys are easier to apply as a substitute, at lower cost, and without requiring significant changes in the basic design of automobiles It is.
- Aluminum alloys have a density of about 1 Z3 of iron, and many easy-to-manufacture products are already used for engine cylinder heads and engine cylinder blocks. These are manufactured by high-speed injection molding, the so-called die-casting method, and can be manufactured at a relatively low cost with good production efficiency, but cannot be made thick and high-strength. With regard to the required suspension parts, there was a problem that it was difficult to apply manufactured parts because damage due to insufficient strength was directly linked to important safety issues. The current state of the technology will be described, taking as an example the undercarriage parts for which weight reduction technology is being studied.
- the materials used for undercarriage parts need to have low corrosiveness, sufficient strength and elongation characteristics, and few defects.
- Forged alloy products and AC 4 CH alloy squeeze cycling products (low-speed injection molded products) have already been used, but their problems of high cost have not been solved, and their application is currently extremely limited. It is.
- the so-called pure aluminum forgings, such as the conventional A6601 alloy forgings are expensive because of the large number of steps, the high cost of the forging raw materials themselves, and This includes waste such as burrs, and the fact that unnecessary materials such as burrs cannot be recycled as raw materials for forged products.
- squeeze cycling products have a large number of processes and a low injection speed, so productivity has not increased and cost reduction has not been realized.
- an aluminum alloy for forging has been proposed in which coarsening of crystal grains is suppressed by adjusting the composition and mechanical properties are excellent.
- an aluminum alloy material for forging having excellent machinability and high strength has been proposed in Japanese Patent Application Laid-Open No. 7-2588784.
- 0.8-2.0 mass% of silicon, 0.5-1.5 mass% of magnesium, 0.5-1.0 mass% of copper, 0.4-1.5 mass% of manganese Using a molten aluminum alloy material adjusted to be a component containing 0.1 to 0.3 mass% of chromium, etc., the cooling rate in the solidification process is controlled, and the casting is continuously formed.
- Aluminum alloy forgings obtained by hot forging, then solution treatment, and then aging are used to make conventional A6601 alloy as raw material when forging into a shape close to the final product.
- the production cost can be reduced by forming into a shape close to the final product at the time of forging, and the extrusion process can be omitted to reduce the manufacturing cost.
- the strength decreases.
- Manganese is an element that suppresses the growth of aluminum crystal grains and maintains the structure finely, thereby improving the strength.
- the amount is large, an intermetallic compound is easily generated, and the strength is rather increased. There is a problem of lowering it.
- An object of the present invention is to provide an aluminum forged product having tensile strength, heat resistance, and elongation that can meet needs, and a method of manufacturing the same.
- it is possible to make a structure like a high-concentration product such as AC4CH with a silicon content of 3% by mass or more, and requires a low-speed structure like AC4CH.
- it is to provide an aluminum alloy material that can be processed into a final shape of a desired part, an aluminum forged product forged by the material, and a method of manufacturing the aluminum forged product.
- this aluminum forged product and the various lightweight vehicle parts provided by its manufacturing method we will reduce fuel consumption of automobiles and other vehicles, reduce carbon dioxide emissions, and prevent global warming and other environmental measures.
- the present inventors have conducted various studies on raw materials and manufacturing methods for aluminum thick-walled products. As a result, silicon, magnesium, copper, manganese, and chromium were contained in predetermined amounts, respectively. Completed the present invention by finding that a sufficient amount of aluminum-forged product that can respond to market needs can be obtained while increasing the fluidity and improving the formability by adding a predetermined amount of titanium. It was made.
- a forged aluminum alloy used for forging after forging and used is 0.6 to 1.8% by mass of silicon, 0.6 to 1.8% by mass of magnesium, and copper 0.8 mass% or less, manganese 0.2-1.0 mass%, chromium 0.225 mass% or less, and titanium 0.0-0.15 mass% and inevitable
- An aluminum alloy consisting essentially of impurities contained in the aluminum alloy is provided.
- This aluminum alloy for forging and forging is used for various vehicles including undercarriage parts with mechanical strength of tensile strength of 32 OMPa or more, 28 OMPa or more, and elongation of 10% or more, which are considered to be marketable. It can be used to manufacture parts.
- a preform molded product having a processing rate of 18 to 60%, when the shape of the final product is 100%, is obtained by using the above aluminum alloy. And then forging the same preform into the shape of the final product, resulting in lower cost and higher productivity than low-speed fabrication using AC4CH. Thus, it becomes possible to manufacture parts for vehicles and the like.
- silicon 0.6 to 1.8 mass%, magnesium 0.6 to 1.8 mass%, copper 0.8 mass% or less, manganese 0.2 to 1.0 mass% After forming a preform from the above aluminum alloy, which is essentially composed of 0.25% by mass or less of chromium and 0.0 to 0.15% by mass of titanium and unavoidably contained impurities, An aluminum forged product made by forging a reform, comprising 6 to 1.8% by mass of silicon, 0.6 to 1.8% by mass of magnesium, 0.8% by mass or less of copper, and 0.2% of manganese.
- aluminum forgings consisting essentially of up to 1.0% by mass, 0.25% by mass or less of chromium, and 0.0 to 0.15% by mass of titanium and unavoidably contained impurities. You.
- the aluminum forged product manufactured in this way has sufficient mechanical strength to be used as vehicle suspension parts, vehicle frames and engine parts.
- silicon is 6 to 1.8% by mass
- magnesium is 6 to 1.8% by mass
- copper is 0.8% by mass or less
- manganese is 0.2 to 1.0% by mass
- chromium is 0%. 25% by mass or less
- titanium 0.0 to 0.15% by mass
- a melting process of melting a forging material which is an aluminum alloy essentially consisting of 0 to 0.15 mass% and unavoidably contained impurities, at about 680 to 780 ° C.
- burrs generated during forging may be reused as a raw material while adjusting each component so as to have the composition of the aluminum alloy according to the present invention.
- the forging material ie, the preform
- the forging material preferably has a shape processing rate of 18 to 60%.
- FIG. 1 is a side view showing one embodiment of the aluminum forged product of the present invention.
- 2 (a), 2 (b) and 2 (c) are views showing one embodiment of a method for manufacturing an aluminum forged product of the present invention
- FIG. FIG. 2 (b) is an enlarged side view showing an example of a molded body in which an internal defect has occurred during fabrication
- FIG. 2 (c) is an enlarged side view showing an example of the difference in the shape of the preform.
- FIG. 3 is an enlarged side view showing an example of a molded body having no internal defect during fabrication.
- FIGS. 3 (a) and 3 (b) are cross-sectional views of the preform for explaining the working ratio.
- Embodiments of the aluminum alloy for forging forging, an aluminum forged product, and a method for manufacturing an aluminum forged product of the present invention will be specifically described below.
- the present invention is not limited to these, and various changes, modifications, and improvements may be made based on the knowledge of those skilled in the art without departing from the scope of the present invention. is there.
- a preform is prepared using an aluminum alloy consisting essentially of 25% by mass or less, 0.0 to 0.15% by mass of titanium, and unavoidably contained impurities, and then the preform is formed. Forging to produce a forged product having a desired shape.
- an aluminum alloy having the above-described composition the aluminum forged product of the present invention having mechanical strength that meets market needs can be manufactured. These can be suitably used as parts for vehicles that are used in harsh environments, especially as suspension parts for automobiles, frames for vehicles, and parts for engines.
- the aluminum alloy for forging and forging according to the present invention comprises: 0.6 to 1.8% by mass of silicon; 0.6 to 1.8% by mass of magnesium; 0.8% by mass or less of copper; and 0.2 to 1.0% of manganese. It is an aluminum alloy consisting essentially of 0% by mass, 0.25% by mass or less of chromium, and 0.0 to 0.15% by mass of titanium, and unavoidable impurities.
- Silicon is included in the aluminum alloy to increase fluidity and help to improve shrinkage cavities.Also, when it is mixed with magnesium, it precipitates as Mg 2 Si, elongation, bow I tensile strength, It is an element that also contributes to the improvement of mechanical strength such as heat resistance. If the silicon content is less than 0.6% by mass, sufficient mechanical strength cannot be secured. On the other hand, if the silicon content exceeds 1.8% by mass, the elongation will be low, and it will not be possible to manufacture products that meet market needs, which is not preferable.
- the amount of silicon is preferably from 0.8 to 1.3% by mass, more preferably from 0.8 to 1.1% by mass.
- the present invention is an aluminum forged product which replaces the conventional forged product at a low cost, so that a higher strength is indispensable and a magnesium content is required.
- the improvement in strength only reaches a plateau, and if too much is added, magnesium is an element that is easily oxidized, so that the oxidation of the molten metal is accelerated, the fluidity is reduced, and structural defects are liable to occur.
- the corrosion resistance is reduced, and the product cannot withstand poor use environments. Therefore, it is preferable to contain a small amount.
- Magnesium is preferably contained in the aluminum alloy for forging at 0.6 to 1.8% by mass. If the amount of magnesium is less than 0.6% by mass, the amount of Mg 2 Si precipitated is insufficient, and the strength is insufficient, which is not preferable. If the amount is more than 1.8% by mass, the quenching sensitivity is reduced in addition to the above. As a result, forging defects are more likely to occur, and as a result, the quality of the forged product is reduced, and the mechanical strength is also lowered. Preferably, it is 0.6 to 1.2% by mass, more preferably 0.7 to 1.1% by mass.
- Copper is an element whose strength can be improved by including it in an aluminum alloy. Forged products containing copper, they are allowed to stand at room temperature after cooling, and precipitate crystals over time, so-called A1-Cu or A1-Cu-Mg precipitation developed by so-called aging treatment. Thus, the strength can be improved by promoting the strength improving action of the precipitated Mg 2 Si as described above.
- copper which is easily oxidized, is susceptible to corrosion if it is added too much. It is preferable to control only lower.
- copper is contained in the aluminum alloy for forging at 0.8% by mass or less. If the content of copper is more than 0.8% by mass, the corrosion resistance is lowered, and it is not preferable because the corrosion resistance is increased and the strength cannot be maintained for a long period of time. Preferably, it is at least 0.005% by mass and less than 0.3% by mass, and more preferably more than 0.1% by mass and less than 0.2% by mass.
- Manganese is contained in the aluminum alloy, It is an element that suppresses the recrystallization of gold and the growth of crystal grains. As a result, the structure in the aluminum alloy is maintained fine, and the strength is maintained. In the present invention, since it is necessary to maintain mechanical strength such as elongation, tensile strength, and heat resistance for a long period of time, it is necessary to contain a small amount of manganese. However, if it is added too much, workability is reduced during forging, and an intermetallic compound is generated, resulting in a decrease in mechanical strength, particularly elongation.
- Manganese is preferably contained in the aluminum alloy for forging in an amount of 0.2 to 1.0% by mass. If the manganese content is less than 0.2% by mass, the desired strength may not be exhibited. If the manganese content is more than 1.0% by mass, the forgeability is reduced, and defects are liable to occur. More preferably, the content is more than 0.5% by mass and 0.7% by mass or less.
- Chromium when contained in an aluminum alloy, has the effect of forming dispersed particles and hindering the movement of grain boundaries after recrystallization, so that fine crystal grains and subcrystal grains can be obtained.
- Chromium is preferably contained in the aluminum alloy for forging at 0.225% by mass or less. Even if chromium is contained in an amount exceeding 0.25% by mass, the desired effect may not be exhibited, which is not preferable. More preferably, the content is 0.04 to 0.25% by mass.
- Titanium is contained in an aluminum alloy to reduce the size of crystal grains and improve workability during forging. Titanium is preferably contained in the aluminum alloy for forging at 0.0 to 0.15% by mass. Even if it does not contain titanium, it does not cause any great trouble.
- the trace metal contained in the aluminum alloy for forging and forging of the present invention and the aluminum forged product of the present invention are as described above, and the rest are impurities and aluminum which are inevitably contained. It is preferable that the unavoidably contained impurities be as small as possible, less than 0.1% by mass, and preferably less than 0.05% by mass.
- burrs which are approximately 30% of generally used raw materials generated in the forging process, are recovered and reused as raw materials for the aluminum alloy according to the present invention. it can. Therefore, according to the present invention, the cost of raw materials can be reduced.
- burrs generated during forging as a raw material.
- This raw material is intended to contain 6-1.8% by mass of silicon, 0.6-1.8% by mass of magnesium, 0.8% by mass or less of copper, 2-1.0% by mass of manganese, chromium 0.25% by mass or less, and titanium 0.0-0.15% by mass, and the deficient metals should be pure metals so as to be an aluminum alloy consisting essentially of unavoidable impurities. Or by mixing other aluminum alloys, etc., so as to become the target component. At this time, it is preferable that unavoidable impurities are not contained in the aluminum alloy in a total amount of 0.1% by mass or more.
- raw materials are put into a melting furnace and heated to about 680 to 780 ° C to dissolve them. Then, they are put into a holding furnace and degassed and deoxidized to obtain a molten metal. Then, a die is formed from the molten metal using a forging apparatus to obtain a forging material.
- the temperature of the mold is preferably adjusted to about 60 to 150 ° C.
- this mold has a shape in which the working ratio is approximately 18 to 60% when the shape of the final forged product is 100%, and the strength is improved by subsequent forging. This is preferable because the process can be further simplified.
- the processing rate is a value representing the degree of processing.
- the first material A with a thickness D1 is processed by a load F, as shown in Fig. 3 (b).
- the machining rate R is expressed by the following equation.
- R [%] (D2-D1) / D1X100 (D2> D1). That is, in the present invention, when the shape of the final forged product is set to 100% by forging, the processing rate is approximately Obtaining a so-called preform having a shape of 18 to 60% means that when forging the forging material to obtain a final product, the thickness of each part of the forging material and the corresponding parts of the final product A preform with a shape such that the processing rate determined using the thickness falls within approximately 18 to 60% in each part That is to gain.
- a forged product obtained by die molding using a forging device that is, a forging material
- a forging device that is, a forging material
- a forging press to obtain Get a forged product.
- the rough forged product is heated again to a surface temperature of about 380 ° C to the melting point or lower, and is subjected to finish stamping by a forging press to obtain a finished forged product.
- This finished forged product is trimmed and subjected to a heat treatment such as T6 treatment to obtain a forged product.
- the load of a forging press is approximately 260 to 280 tons for rough forging and approximately 320 to 380 for finish forging when manufacturing knuckle steering, which is an undercarriage part for automobiles. 100 tons.
- burrs generated by the forging press and trimming during the manufacturing process of the present invention can also be collected by the deburring machine and reused as a raw material of the aluminum forged product of the present invention. It is. Therefore, all forging materials are recycled, and there is no waste or inexpensive forging materials.
- the working ratio when the shape of the final forged product is set to 100% is approximately as follows. 18% to 60%, while improving the strength by forging, making it closer to the shape of the product than conventional forging raw materials and making it easier to press, so extruding and cutting as in the conventional forging process
- the manufacturing process can be simplified without going through the steps of heating, rough forging, rough forging, finish forging, and trimming, thereby reducing manufacturing costs.
- FIG. 1 is a view showing an embodiment of an aluminum forged product according to the present invention, which is a knuckle steering 40 of an automobile part.
- Example 2 From the results of Example 1 and Example 2, the mechanical properties of the aluminum forged product of the present invention ensured that the bow I tensile strength, heat resistance, and elongation could satisfy the market requirements in all of the required properties. It had been. Industrial applicability
- an aluminum-forged product meeting market needs can be manufactured with a simpler manufacturing process, with higher productivity, and , Provided at low cost.
- the aluminum-forged product provides various vehicle parts such as lightweight and inexpensive undercarriage parts for vehicles, frames for vehicles, and engine packs. Through this, the fuel efficiency of automobiles is reduced, and as a result, the carbon dioxide emissions are reduced, which has the effect of contributing to the prevention of global warming.
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Abstract
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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JP2004541254A JPWO2004031424A1 (ja) | 2002-10-01 | 2003-09-30 | 鋳造鍛造用アルミニウム合金、アルミニウム鋳造鍛造品及び製造方法 |
EP03748621A EP1566458A4 (en) | 2002-10-01 | 2003-09-30 | ALUMINUM ALLOY ALLOY FOR FORGING AND ALUMINUM MOLD FORGING PRODUCT AND MANUFACTURING METHOD THEREFOR |
AU2003268697A AU2003268697A1 (en) | 2002-10-01 | 2003-09-30 | Aluminum alloy for casting-forging, aluminum cast/forged article, and method for manufacture thereof |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2002-288455 | 2002-10-01 | ||
JP2002288455 | 2002-10-01 |
Publications (1)
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WO2004031424A1 true WO2004031424A1 (ja) | 2004-04-15 |
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PCT/JP2003/012514 WO2004031424A1 (ja) | 2002-10-01 | 2003-09-30 | 鋳造鍛造用アルミニウム合金、アルミニウム鋳造鍛造品及び製造方法 |
Country Status (7)
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US (2) | US20040151615A1 (ja) |
EP (1) | EP1566458A4 (ja) |
JP (1) | JPWO2004031424A1 (ja) |
CN (1) | CN1497052A (ja) |
AU (1) | AU2003268697A1 (ja) |
PL (1) | PL374938A1 (ja) |
WO (1) | WO2004031424A1 (ja) |
Cited By (2)
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JP2009149931A (ja) | 2007-12-19 | 2009-07-09 | Honda Motor Co Ltd | アルミニウム系部品及びそれの製造方法 |
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Also Published As
Publication number | Publication date |
---|---|
EP1566458A1 (en) | 2005-08-24 |
PL374938A1 (en) | 2005-11-14 |
AU2003268697A8 (en) | 2004-04-23 |
AU2003268697A1 (en) | 2004-04-23 |
EP1566458A4 (en) | 2006-04-26 |
JPWO2004031424A1 (ja) | 2006-02-02 |
US20050279429A1 (en) | 2005-12-22 |
US20040151615A1 (en) | 2004-08-05 |
CN1497052A (zh) | 2004-05-19 |
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