JPH03219001A - Method for solid-forming aluminum alloy powder - Google Patents

Abstract

PURPOSE:To enable solid-forming of Al alloy powder with reduced man-hour and improved yield of material, by packing the Al alloy powder into an Al alloy-made vessel, degassing, sealing and executing hot closed forging to this vessel in a metallic mold having the desired shape. CONSTITUTION:The gas atomized powder 1 of Al alloy is packed under tapping into the Al alloy (JIS A5052, etc.)-made cylindrical vessel 2, and the vessel 2 and a cover 10 having the same quality as the vessel are welded. Successively, the vacuum degassing treatment is executed to the vessel 2 through degassing hole part 9 in the cover 10 to make the prescribed vacuum condition, and the degassing hole part 9 is closed to seal the powder 1 under vacuum condition in the vessel 2. By heating this vessel 2 to the prescribed temp. and this is housed in the recessed mold 4 in the lower metallic mold 3 and the upper metallic mold 5 is descended and the projecting mold 6 thereof is pressed in the recessed mold 4 to execute the prescribed rate of hot closed forging, and the solid forming is executed to the powder 1. This forged product 7 is taken out from the lower metallic mold 3 with a knockout 8, and the vessel 2 at outer circumference is machined and removed to obtain the solid formed product. In this way, the high quality solid formed product is manufactured at a low cost.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for solidifying and molding aluminum alloy powder, and more specifically, it relates to a method for solidifying and molding aluminum alloy powder, and in particular, it is used to manufacture automobiles, aircraft, robots, and electric appliances from aluminum alloy powder obtained by a rapid solidification method. The present invention relates to a method for solidifying and molding aluminum alloy powder in the molding of heat-resistant and/or wear-resistant parts such as aluminum alloy powder.

(Prior art) In recent years, high-quality aluminum alloy powder with fine crystals and a uniform structure without segregation has been produced using the rapid solidification method, and high-quality parts can be manufactured using this aluminum alloy powder. It is starting to be manufactured. On the other hand, when manufacturing products from aluminum alloy powder, in the process, the aluminum alloy powder is formed into a compact by cold isostatic pressing or hot isostatic pressing after being vacuum sealed in a steel container. Extrusion processing and/or
Alternatively, it is forged and solidified into an intermediate material.

[Problems to be Solved by the Invention] By the way, the above-mentioned solidification molding method requires press processing to obtain a molded body and extrusion processing for solidification molding, etc., and does not require two or more steps. This increases the number of man-hours, and in addition, each process generates scraps such as shavings and stiffness, resulting in a hot and low material yield. In addition, for this reason, the manufacturing cost of aluminum alloy powder products is high, which poses a problem.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method for solidifying and molding aluminum alloy powder, which solves the above-mentioned problems, reduces the number of man-hours, and increases retention.

(Means for Solving LJ!) In order to achieve the above object, the method for solidifying and molding aluminum alloy powder of the present invention involves filling an aluminum alloy powder into a container made of aluminum or an aluminum alloy, and filling the inside of the container with the aluminum alloy powder. After degassing, the container is sealed and sealed, and the sealed container is hot-hermetically forged in a mold having a desired shape.

[Function] According to the method of the present invention, the aluminum alloy powder is filled in a container made of aluminum or an aluminum alloy and sealed in a vacuum state, so that oxidation during subsequent heating etc. is suppressed, and as a result, Deterioration of toughness of forged material after hot hermetic forging can be prevented. In addition, for this reason, the container filled with aluminum alloy powder can be solidified and formed into an intermediate material simply by hot hermetic forging in a mold of the desired shape.
The process of forming a molded body by pressing can be omitted.

In addition, since the product is hot-sealed forged in a mold with a desired shape, it is possible to reduce the generation of debris such as debris and improve the yield, and it is possible to solidify the product into a near-neoto shape according to the shape of the product.

Furthermore, since the container is made of aluminum or aluminum alloy, cracking can be prevented during hot hermetic forging as the material changes into the desired shape.

In addition, for the above reasons, the material for the container made of aluminum or aluminum alloy is preferably a material that has excellent deformability at the processing temperature (approximately 300 to 500°C) during hot hermetic forging, such as pure aluminum ( J I
S A100O series) or JIS A3000 series aluminum alloys are preferably used.

Further, when filling the container with the aluminum alloy powder described above, it is preferable to perform tap filling so that the powder is densely packed.

〔Example〕

The present invention will be explained in detail below.

FIGS. 1(a) and 1(b) are explanatory diagrams of the hot forging process related to the method of solidifying and forming aluminum alloy powder of the present invention, in which aluminum alloy powder 1 is first filled with taps and vacuum The enclosed cylindrical container 2 made of aluminum alloy is heated to a predetermined temperature by a heating device (not shown) and is housed in the concave mold 4 of the lower mold 3. (See Figure 1(a)) Next, the upper die 5 is lowered, the protruding die 6 formed in the upper die 5 is press-fitted into the concave die 4 of the lower die 3, and a predetermined amount of hot hermetic forging is performed. is performed to form an intermediate material 7. (Figure 1 (c)
(See) After this, the upper mold 5 is raised and the intermediate material 7 is kicked out from the inside of the concave mold 4 of the lower mold 3 by the knockout 8.

In addition, 9 in the figure is a deaeration port provided in the lid lO welded to the cylindrical container 2.

Next, an example in which gas atomized Al-5i alloy powder is assimilated and molded according to the above procedure will be described.

First, gas atomized powder I of an Al-5i alloy was tap-filled into an inner cylindrical container 2 made of aluminum alloy (JIS A3052) with an outer diameter of 110 mm, a height of 150 mm, and a wall thickness of 3IllI11. The true density ratio of powder I obtained by this filling was 60 to 70%. Next, the container 2 after filling
110 made of the same alloy is welded to the top surface, and the inside of the container 2 is vacuum degassed through the deaeration port 9 provided in the center of the lid 10, and degassing is performed when a predetermined vacuum state is obtained. The mouth part 9 was closed, and the powder 1 was vacuum-sealed into the container 2.

Thereafter, the vacuum-sealed container 2 is heated to 430°C, and is heated to a thickness of 50 mra in a closed mold consisting of a lower mold 3 and an upper mold 5 that constitute a mold cavity with a planar shape of 120 mm x 160 mm. Powder 1 was solidified and molded by hot hermetic forging.

In addition, during hot hermetic forging, the hermetic die was heated to 400'C.

120mm x 160m+ obtained as above
* For a forged product with a thickness of
The condition of the solidified molded product inside was investigated. As a result, the assimilated molded product is equivalent to or better than that of the solidified molded product obtained by the conventional method, for example, the true density ratio is 99.9.
% or more, and the tensile strength is 35 kgf/mm2 or more. [Effects of the Invention] As explained above, according to the method of the present invention, the process of forming a compact by pressing is omitted, and high density, high It is possible to solidify and mold strong powder, and since it is hot-hermetically forged in a mold of the desired shape, there is less generation of debris such as paris, which improves the yield, and it can also be shaped according to the product shape. Can be solidified and molded. In addition, since it is possible to obtain high-quality solidified molding at low cost, it can be expected to be used more widely in various fields of application.

[Brief explanation of drawings]

111J(a) and FIG. 1(b) are explanatory diagrams of the hot forging process related to the method for solidifying and forming aluminum alloy powder of the present invention. 1 Aluminum alloy 'F5''J end 2 Aluminum alloy cylindrical container 3 Lower mold 4 Concave mold 5 Upper mold 6 Protruding mold

Claims (1)

[Claims] The aluminum alloy powder is filled into a container made of aluminum or an aluminum alloy, and the container is sealed and sealed after degassing, and the sealed container is hot sealed and forged in a mold of a desired shape. A method for solidifying and molding aluminum alloy powder, characterized by: