JPH0227402B2 - ALKIKYUREIGYOKOFUNMATSUNOOSHIDASHISEIKEIHOHO - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an economically advantageous molding method for Al-based rapidly solidified powder containing Al as a main component.

(Prior art) Sintered extruded material of Al-based rapidly solidified powder of Al or Al alloy has excellent mechanical and thermal properties that are not possessed by melted Al alloy, etc., so it is difficult to use such sintered extruded material. , where high-performance mechanical parts are manufactured.

Sintered extruded materials are usually made by compression molding Al-based rapidly solidified powder in an isodirectional manner using cold isostatic pressing (CIP), and then sealing the molded material and degassing it to yield 1 to 3 T/cm. ² Hot isostatic pressurization (HIP) of about 0.5Hr
After pressurized sintering using a sintered material, the sintered material was extruded to give the material its external shape. And, sintered extrusion materials are cold forged or 250~
By warm forging at 400℃, it is processed into a molded product with an external shape similar to the desired product.

In order to obtain a sintered material of Al-based rapidly solidified powder,
The reason why advanced processing such as HIP is required is as follows. That is, since the Al-based rapidly solidified powder is produced by an air atomization method or a water atomization method, a stable and inert Al ₂ O ₃ film is firmly formed on its surface. Therefore, in order to obtain such a sintered powder material, the Al atoms must be diffused and bonded through the Al ₂ O ₃ film, and it is therefore necessary to provide strong diffusion bonding conditions.

(Problems to be Solved by the Invention) However, the above-mentioned molding method requires five steps from powder raw material to completion of molding, resulting in poor productivity.Moreover, the main steps require considerably expensive equipment, and as a result, This led to high costs for molded products. Furthermore, HIP,
250 ~ repeatedly during extrusion and molding in some cases
Because it is heated to 400°C, the precipitates and crystallized substances in the microstructure of the rapidly solidified powder enlarge and grow, which impairs its mechanical properties.

The present invention was made in view of such problems,
The object of the present invention is to provide a method for molding Al-based rapidly solidified powder that maintains the same material properties as molded products obtained by conventional processes, is low in cost, and has excellent productivity.

(Means for Solving the Problems) The present invention, which has been taken to achieve the above-mentioned objects, is characterized in that a compression molding material of Al-based rapidly solidified powder stored inside a container is molded into a molding material. The extruded material is extruded into a molding chamber provided in the mold, and the extruded material is processed and formed in the molding chamber by the extrusion force, and then the pressed molded material is separated from the extruded material while the pressed molded material is accommodated in the molding chamber. Then, the molded product inside the molding chamber is taken out.

(Example) Hereinafter, with reference to the drawings, an apparatus for carrying out the present invention will first be outlined, and a method of the present invention will be explained.

The piston extrusion molding apparatus 1 shown in FIGS. 1 to 4 includes a container 2 having an extrusion opening 6 and an extrusion stem 8, and an extrusion opening end 7 of the container 2.
A molding die 3 is provided so as to be able to freely come into contact with and separate from the mold.

The molding die 3 has an extrusion opening end 7.
A cylindrical forming hole 11 that communicates linearly with the extrusion opening 6 and has the same cross-section as the extrusion opening 6 when the extrusion opening 6 comes into contact with the extrusion opening 6 is opened in the extrusion direction. A receiving mold 1 is inserted into the molding hole 11 and can be fixed at a desired position.
2 is slidably inserted therein, and a mold part 13 for molding the inner peripheral part of the piston is formed at the end of the receiving mold 12 on the container side.

Next, the method of the present invention will be explained using the extrusion molding apparatus 1 described above.

First, as shown in Fig. 1, the molding die 3 is brought into contact with the extrusion opening end 7 of the container 2, and both are clamped, so that the extrusion opening 6 and the molding die 3 are opened along the extrusion direction. It communicates with the molding hole 11. On the other hand, the receiving mold 12 inserted into the molding hole 11 is slid toward the container and fixed at a predetermined position, thereby forming a desired molding chamber 16 in the molding hole 11.

Next, the compression molding material 15 of Al-based rapidly solidified powder is loaded into the container 2 .

The compression molded material 15 is preferably compression molded to have an apparent specific gravity of 60 to 80% of the true specific gravity. If it is less than 60%, the solidification of the powder is insufficient and handling becomes difficult. On the other hand, if it exceeds 80%, a high load is required during compression, a large-sized device is required, and a long time is required for molding. Furthermore, the voids inside the molded material become too small, and it becomes difficult to remove moisture remaining in the internal voids even when heated during extrusion, leading to quality deterioration.

Note that the method for forming the compression molded material 15 is not limited to CIP, which performs isodirectional compression, but uniaxial compression using a normal press is sufficient. Uniaxial compression has the advantage that it can be performed with simple equipment and that large-sized molded materials can be easily obtained. Note that compression molding may be performed at room temperature and does not require particular heating.

As shown in FIG. 2, the compression molding material 15 loaded in the container 2 is extruded from the extrusion opening 6 into the molding chamber 16 provided in the molding hole 11 as the extrusion stem 8 moves toward the extrusion opening 6 side. At the same time, the extruded material forms the lower part of the molding chamber 16 by the extrusion force.
The inner circumferential surface of the piston is pressed against the mold part 13 of the piston, and the inner circumferential surface of the piston is press-molded.

The rapidly solidified powder constituting the compression molded material 15 is subjected to strong shearing action during extrusion processing, resulting in an inert and stable inert material of several angstroms formed on the outer surface of the powder.
The Al ₂ O ₃ coating is fragmented and destroyed, and the crystallized substances and precipitates in the Al base are also finely fragmented, and these are uniformly dispersed in the Al base to increase the strength. Then, the bases can be easily integrated by diffusion bonding.

During extrusion, the extrusion ratio is preferably 5-20. If it is less than 5, the dividing action of the Al ₂ O ₃ film etc. will be insufficient, while if it exceeds 20, the extrusion load will be excessive, making it unsuitable for industrial production. In addition, preferably 7 to 12
A range of is good.

The extrusion temperature is preferably 250 to 450°C. 250℃
If it is less than this, the deformation resistance of the rapidly solidified powder becomes large, a large extrusion load is required, and the diffusion bonding of the base after the Al ₂ O ₃ coating is divided and destroyed becomes insufficient. On the other hand, if the temperature exceeds 450°C, the generation and growth of precipitate nuclei will be promoted, and coarse precipitates will be formed, leading to a decrease in strength.

After the pressure forming by extrusion is completed, as shown in FIG. 3, with the receiving mold 12 fixed in position, the molding die 3 is separated from the container 2 by a predetermined distance, and the space between the molding die 3 and the container 2 is removed. A cutting gap d ₁ is formed in the gap d 1 , and a cutting tool such as a band saw or a rotary blade is inserted into the gap d ₁ , or a laser beam is irradiated to cut and separate the press-molded body 17 from the extruded material.

At this time, the pressure-formed body 17 that has been pressure-molded in the molding chamber 16 is cut while being substantially housed inside the molding chamber 16, so the pressure-formed body 17 is not deformed due to cutting. It almost never occurs.

After the press molded body 17 is cut, the mold 3 further separates from the container 2 and retreats to the gap _d2 from which the molded product 18 can be taken out, as shown in FIG. After that, slide the receiving mold 12 toward the container side,
The molded product 18 placed on the mold part 13 is inserted into the molding hole 1.
After the molded product 18 is clamped by an appropriate clamping device 19, the receiving mold 12 is returned into the molding hole 11, and the molded product 18 is taken out of the molding device 1.

This completes one cycle of manufacturing, and the first
The state shown in the figure is restored and the next molded product is manufactured.

(Effects of the Invention) As explained above, according to the extrusion molding method of the present invention, the inert and stable Al ₂ O ₃ coating formed on the surface of the Al-based rapidly solidified powder is divided by extrusion. Since it can be dispersed in the base and the base can be diffusion bonded, compression molding material of Al-based rapidly solidified powder can be used as the extrusion material, and HIP treatment, etc., which requires expensive equipment to mold the extrusion material, can be omitted. , it is possible to reduce the cost of production equipment.

In addition, since pressure forming is completed at the same time as extrusion,
Extrusion makes it possible to obtain desired molded products, has excellent overall productivity, and greatly contributes to reducing the cost of molded products.

Furthermore, since the molded product is only heated during extrusion while the molded product is obtained from the rapidly solidified powder, the desired molded product can be obtained without impairing the material properties of the rapidly solidified powder.

Furthermore, since the press molded product is separated from the extruded material while being housed in the molding chamber, the outer shape of the molded product can be maintained well.

As described above, according to the present invention, a molded product that is excellent in terms of cost and quality can be obtained,
The industrial value is significant.

[Brief explanation of drawings]

1 to 4 are cross-sectional explanatory diagrams showing an apparatus and a processing process for carrying out the present invention.
The figure shows how compression molding material is loaded into the container.
The figure shows the state of extrusion molding, FIG. 3 shows the state of forming a cutting gap in the press-molded product, and FIG. 4 shows the state of taking out the molded product. 2... Container, 2... Molding die, 6... Extrusion opening, 7... Extrusion opening end, 11... Molding hole, 12
... Receiving mold, 13 ... Molding mold part, 15 ... Compression molding material, 16 ... Molding chamber, 17 ... Pressure molded body, 1
8... Molded product.

Claims (1)

[Claims] 1 A compression molded material of Al-based rapidly solidified powder stored inside a container is extruded into a molding chamber provided in a molding die, and the extruded material is pressure-molded in the molding chamber by the extrusion force, and then pressurized. The press-formed body is separated from the extruded material while the press-molded body is housed in the molding chamber, and then the molded product in the molding chamber is taken out.
Extrusion molding method for Al-based rapidly solidified powder.