Aluminum alloy for casting-forge, and aluminum casting forged product and manufacturing method therefor

a technology of aluminum alloy and casting forge, which is applied in the direction of steering linkages, transportation and packaging, mechanical equipment, etc., can solve the problems of increasing cost, reducing the weight of automobiles, and increasing the cost of materials for reducing weigh

Inactive Publication Date: 2003-01-16
ASAHI TEC CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reduction in weight of automobile is accompanied by a problem of increased cost that is to be solved.
However, such a material for reducing the weight is generally expensive.
However, castings having large thickness and high strength cannot be produced.
For the suspension parts required to reduce the weight as described above, a failure due to insufficient strength presents an important problem relating to safety, so that there has been a problem of difficulty in applying the casting.
However, these materials still have an unsolved problem of high cost, so that the application thereof is extremely limited at present.
The reasons why a so-called pure aluminum forging such as the conventional A6061 alloy forging is high in cost is that the number of manufacturing processes is large, that the raw material for forging itself is expensive, waste such as flash is caused during the manufacturing process, and that a useless material such as flash cannot be recycled as a raw material for forging.
Also, for a squeeze casting, because of a large number of processes and a low injection speed, the productivity is low and a low cost cannot be attained.
However, for this aluminum alloy, although the strength is increased, there arises a new problem in that a low cost cannot be attained,

Method used

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  • Aluminum alloy for casting-forge, and aluminum casting forged product and manufacturing method therefor
  • Aluminum alloy for casting-forge, and aluminum casting forged product and manufacturing method therefor
  • Aluminum alloy for casting-forge, and aluminum casting forged product and manufacturing method therefor

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0061] FIG. 1 is a side view showing one example of the aluminum casting forged product in accordance with the present invention, showing a steering knuckle 40, which is an automobile part.

[0062] A small amount of manganese was added to scraps of A6061 alloy to prepare a raw material containing 0.6 wt % silicon, 0.8 wt % magnesium, 0.2 wt % copper, and 0.03 wt % manganese. Using this raw material, the steering knuckle 40 having a shape shown in FIG. 1 was manufactured by observing the steps described below.

[0063] After the raw material was melted at a molten metal temperature of 728.degree. C. to obtain molten metal, a raw material for forging having a shape with a compression ratio of 30% when the shape of final steering knuckle 40 was taken as 100% was molded at a mold temperature of 100.degree. C. Next, closed die forging was performed by using a forging press at a rough forging temperature of 395.degree. C. (surface temperature) by applying a rough forging load of 2770 tons to o...

example 2

[0066] A steering knuckle was manufactured in the same way as in Example 1 except that the temperature condition and load condition were changed so that the molten metal temperature is 720.degree. C., the mold temperature is 125.degree. C., the rough forging temperature is 400.degree. C., the rough forging load is 2730 tons, the finish forging temperature is 445.degree. C., and the finish forging load is 3780 tons, and the mechanical properties were examined.

[0067] The temperature condition and load condition are given in Tables 1 and 2, respectively, and the measurement result of mechanical properties is given in Table 3.

[0068] The results of Examples 1 and 2 reveal that the mechanical properties of the aluminum casting forged product in accordance with the present invention were kept at values higher than the values specified for A6061FD manufactured by the conventional forging process in terms of all of tensile strength, proof stress, and elongation.

example 9

[0069] The same raw material as that in Example 1 was prepared, and a columnar specimen was manufactured. After the raw material was melted at a molten metal temperature of 728.degree. C. to obtain molten metal, a raw material for forging was molded. At the time of forging, the compression ratio was changed to 5%, 12%, 15%, 18%, 27%, 30%, 37%, 41%, 45%, 51%, 60%, 67%, 73%, and 80%, and fourteen products were manufactured.

[0070] FIG. 2(a) is a view showing a difference in shape for each compression ratio. For these raw materials (columnar specimens) with a different shape, the interior of each specimen was observed.

[0071] As a result, as shown in FIG. 2(b), for the raw materials for forging with a compression ratio of 13% or less, an internal defect remained. All of the raw materials for forging with a compression ratio of 18% or more were good in quality without defects as shown in FIG. 2(c).

Industrial Applicability

[0072] As described above, according to the present invention, there...

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Abstract

An aluminum casting forged product is provided by using an aluminum alloy for casting forge including a useless raw material for forging such as flash as a raw material and by controlling a weight percentage of an alloy element such as silicon, magnesium, copper, and manganese; the product having an enhanced fluidity, and an improved castability, with retaining a sufficient strength, preventing useless intermetallic compounds from forming, restraining deterioration due to oxidation and corrosion, and further improved strength by a forging effect: and there is also provided a simple manufacturing method, with a high yield and high productivity. An aluminum casting forged product of high tensile strength, high proof, and elongation, higher mechanical properties than those of the conventional casting forged product, high corrosion resistance, and high quality without defects, and being low in cost is also obtainable as a thick-wall aluminum product.

Description

BACKGROUND OF THE INVENTION AND RELATED ART STATEMENT[0001] The present invention relates to an aluminum alloy for casting forge and an aluminum casting forged product that is used for a vehicular part or the like and is less costly, and a manufacturing method for the aluminum casting forged product. More particularly, it relates to an aluminum alloy for casting forge that is used to manufacture vehicular suspension parts which are required to be light in weight to improve fuel economy of an automobile and can use useless forging materials such as flash produced in a forging process, an aluminum casting forged product that has high mechanical properties and contains particular amounts of silicon, magnesium, copper, and manganese, and a manufacturing method for the aluminum casting forged product.[0002] It is said that global warming, which is one of global environmental problems, is greatly affected by carbon dioxide produced by all human activities, and an decrease in carbon dioxid...

Claims

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Application Information

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IPC IPC(8): B21J5/00B21J5/02B21K1/26B62D7/18C22C21/02C22C21/06C22C21/08C22F1/00C22F1/05
CPCB21J5/00B21J5/002B21J5/02B21K1/26B60G2206/10B60G2206/20B60G2206/50B60G2206/7102B60G2206/7103B60G2206/8101B60G2206/81022B62D7/18C22C21/02C22C21/08
Inventor MATSUMOTO, MASAHARUWATANABE, MASATOSHIMACHINO, DAISUKE
Owner ASAHI TEC CORP
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