JPH09155491A - Production of molded good - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain molded goods having intricate shapes from a hardly workable rapidly solidified alloy material while maintaining its characteristics by extruding the rapidly solidified alloy material in such a manner that its front surface is coated with an easily workable metallic material, then removing the coating layer and subjecting the material to plastic working. SOLUTION: An extruder to be used is composed of a container 3 and a stem 4. The hardly workable rapidly solidified allay material 1 is packed into the inner side of the container 3 and the easily workable metallic material 2 is packed into the outer side thereof. A coating extrudate 6 is then extruded by the stem 4 from an opening 5 of the opposite side. The coating extrudate 6 is removed of the easily workable metallic material by a scalping blade 7 and is cut to a billet B of a required length by a cutting blade 8. The resulted billet B is rapidly heated or heated in a furnace and is extruded into the cavity of the die, by which the molded goods are obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is to obtain a molded product easily from a rapidly solidified alloy material which is difficult to work.

[0002]

2. Description of the Related Art In general, a rapidly solidified alloy material having excellent properties is manufactured in a powder form, a ribbon or a fine wire form because of its fine structure. Such a rapidly solidified alloy material is molded into a molded product having a predetermined shape by subjecting it to plastic working such as extrusion and forging.

However, when subjecting a rapidly solidified alloy material to plastic working, the deformation resistance of the material is large and the working cannot be performed easily. Further, in processing, there is also a problem that thermal effects must be taken into consideration, such as crystal grains coarsening and loss of properties when kept at a high temperature for a long time.

Further, the current molded article made of a rapidly solidified alloy material is a forged product made of a powdery, ribbon-shaped, or fine-lined raw material, an extruded product obtained by subjecting the raw material to plastic working, or a forged product made of an extruded material. However, in reality, there is no molded product having a complicated shape.

[0005]

Therefore, the present invention provides a method for producing a molded product having a relatively complicated shape while maintaining the excellent properties of the rapidly solidified alloy powder.

[0006]

According to the present invention, an extruded material is produced by extruding a rapidly solidified alloy material together with an easily workable metal material so that the easily workable metal material covers the surface of the rapidly solidified alloy material. The method for producing a molded article is characterized in that the obtained extruded material is plastically worked after removing the coating layer made of the easily workable metal material.

The above-mentioned plastic working is carried out by forging, extrusion forging, pressing or the like. In any case, an extruded material which is a preform having a simple form is prepared, and the extruded product is processed into a molded product having a complicated form. . A typical example thereof is a method in which an extruded material is placed in a container connected to a molding part provided in a molding die and the heated extruded material is extruded and molded into the molding part.

When manufacturing an extruded material, the extruding is performed so that the hardened rapidly solidified alloy material is coated with the easily workable metal material. Is uniformly coated on the surface, and the easily processable metal material is easily removed in the subsequent step. Further, it is possible to reduce the thermal influence on the rapidly solidified alloy material.

By processing in this way, it becomes possible to easily process even rapidly hardened rapidly solidified alloy powder, and since the initial processing pressure can be suppressed, there is little processing heat generation and rapid cooling. It is difficult to deteriorate the properties of the solidified alloy material.

The fact that the easily workable metal material is easily removed does not destroy the form of the rapidly solidified alloy material which is difficult to work, so that the plastic working of the rapidly solidified alloy material molded body thereafter is performed. To facilitate. In addition, since the object of removal itself is an easily workable metal material, it is not necessary to take any special removing means, and the object can be removed by an ordinary means.

As the plastic working, as mentioned above, forging,
Although there are extrusion forging, pressing, etc., in order to further maintain the excellent properties of the rapidly solidified alloy material maintained in the first extruded material manufacturing process, process at a relatively high temperature and in a short time. There is a need to do. Although it is possible to perform the plastic working in multiple stages, it is preferable that the plastic working is carried out by one working, if possible, and extrusion forging is more effective when forming a complicated shape by one working.

As a concrete condition for forming, it is effective that the temperature is equal to or higher than the crystallization temperature of the rapidly solidified alloy material, and preferably close to the crystallization temperature. Specifically, 200 ° C to 600 ° C is effective. The molding time is preferably 300 seconds or less,
After molding, it is preferable to cool at a cooling rate of 50 ° C./s or more. Further, the heating rate of the material is 30 ° C / s to 300 ° C /
It is preferable to carry out s. The molding time is more preferably 150 seconds or less.

The rapidly solidified alloy material used in this manufacturing method is
Considering a series of steps, a material exhibiting superplasticity is preferable.

The removal of the coating layer is carried out between the production of the extruded material and the plastic working. In order to carry out the working continuously, it is preferable to carry out immediately after the extruded material is extruded or immediately before the plastic working, and immediately after the extruding. In the case of the above, since the processing can be performed by utilizing the heat of the material added during the extrusion, the processing can be performed more easily.

The Applicant has long been involved in the development of a series of superplastic Al-based alloys. That is, by quenching an alloy material having a specific composition, an amorphous phase, a mixed phase of amorphous and fine crystalline, or a fine crystalline phase is obtained, and a material suitable for superplastic working has been proposed. Such an alloy is suitable for high-speed forging and high-speed rolling performed at a relatively high speed and has high strength, and has been attracting attention as an alloy material different from conventional Al-based alloys. This superplastic Al-based alloy is
The average grain size of Al and the average grain size of the intermetallic compound are 1
The average Al crystal grain size is 0.005 to 1 μm, and the average grain size of the intermetallic compound is 0.001 to 0.1 μm. Such materials can be effectively applied to the present invention.

The following are examples of specific alloy material compositions. Of course, this is an example, and there are other materials applicable to the present invention.

Al ₇₈ Ni ₁₂ Mm ₁₀ Al ₉₂ Ni ₄ Fe ₁ Mm ₃ Al ₈₇ Ni ₈ Y ₅ Al _89.5 Ni ₈ Zr _2.5 Al _89.6 Ni ₈ Zr ₂ Mg _0.5 Al ₉₀ Ni ₇ Zr ₂ Cu ₁ Al _91.8 Ni ₆ Nb _0.2 Hf ₁ Ce ₁ Al _92.5 Ni ₅ Fe ₁ Zr ₁ Ta _0.5 Al _93.5 Ni ₂ V ₁ Y _1.5 Ti ₂ Al ₈₇ Co ₈ Si ₁ Cu ₂ Nb ₁ Zr ₁ Al ₉₁ Mn ₂ Mg ₂ Zn ₁ Y ₄ Al _87.5 Ni ₇ Co ₁ Cr _0.5 Ca _0.5 Hf ₁ Ti _2.5 Al _88.7 Ni ₈ Cr ₁ Mg _0.2 Zn _0.1 Ce ₂

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory view of a concrete process of the present invention.
First, a rapidly solidified alloy powder is produced by an atomizing method, and the obtained powder is extruded together so that a differently-processable metal powder is on the surface side to produce a coated extruded material A.
The extruded material A is a hard-quenching rapidly solidified alloy material whose surface is coated with an easily workable metal material.

Next, the easily workable metal material coated on the surface of the coated extruded material A is removed (skinned) to remove the coating layer from the long coated extruded material A which is formed into a compact only of the rapidly solidified alloy material. Before and after, it is cut into a billet B (extruded material: hereinafter referred to as a billet) having a length necessary for processing in the next step.

The billet B thus obtained is rapidly heated or heated in a furnace and extruded into a molding portion (cavity) of a molding die to obtain a molded product.

2 to 5 are explanatory views of an apparatus suitable for carrying out each step.

2 and 3 show a first specific method, and FIG. 2 is an explanatory view of a step of extruding the rapidly solidified alloy material 1 while coating the easily workable metal material 2 on the surface thereof.
The extruder is composed of a container 3 and a stem 4. Inside the container 3, a hard-working rapidly solidified alloy material is filled on the inner side and a easily workable metal material on the outer side. The coated extruded material 6 is extruded from the side opening 5. The extruded coated extruded material 6 removes the easily workable metal material 2 on the surface by a peeling blade 7, and then cuts it into a billet B having an appropriate length by a cutting blade 8.

FIG. 3 is an explanatory view of the extrusion forging device in the plastic working process. The extrusion forging device includes an upper die 9 and a lower die 10,
A molding part (cavity) 11 formed between them,
It comprises a storage hole 12 provided directly above the molding portion 11 and in which the billet B is arranged, and a stem 13 for pushing the billet B into the molding portion 11. Also, the billet B and the heating means 1 for heating the molded product are provided in each of the upper mold 9 and the lower mold 10.
4 is provided and the heating temperature is adjusted based on the thermocouple 15. The billet B arranged in the housing hole 12 of the upper mold 9 is heated by the heating means 14 and extruded into the molding portion 11 by the stem 13 to produce a molded product.

FIGS. 4 and 5 show a second concrete method. FIG. 4 is an explanatory view of a step of extruding while coating the surface of the rapidly solidified alloy material 1 with the easily workable metal material 2, and the container 3 2, the stem 4 and the opening 5 are the same as those in the case of FIG. 2, but the peeling blade 7 is not provided, and the coated extruded material 6 is cut by the cutting blade 8 without peeling the coated billet B. 'Is produced.

FIG. 5 is an explanatory view of the extrusion forging device in the plastic working process. The upper mold 9, the lower mold 10, the molding portion 11, the housing hole 12, the heating means 14, and the thermocouple 15 are the same as those in FIG. 3, but the difference from FIG. 3 is that the container 1 is directly above the upper mold 9.
6 is formed, the container 16 is formed with an insertion hole 17 communicating with the storage hole 12 of the upper mold 9, and the easily workable metal material of the coated billet B ′ is provided between the container 16 and the upper mold 9. A removing means 19 for removing the covering portion 18 made of is provided, and the covering portion 1 removed on the outer side of the removing means 19.
A discharge unit 20 for discharging 8 is provided. The coated billet B ′ is inserted into the insertion hole 17 of the container 16 and pressed by the stem 21 toward the forming part 11, so that the removing part 19 on the upper die 9 removes the covering part, and only the rapidly solidified alloy material is used. The billet is a storage hole 1 for the upper mold 19.
Inserted into 2. By further pressing the stem 21, the billet is inserted into the molding portion 11 and a molded product is manufactured. The billet is heated by the heating means 14 when the billet is placed in the storage hole 12, but it is also possible to provide the container 16 with the heating means and push the heated billet B ′ into the molding portion 11 after removing the coating portion. It is possible.

FIG. 6 shows that the molded product 22 can be obtained from the billet B. The molded product 22 has a shape having a protruding portion which projects from the peripheral edge of the base portion toward the end, and is a hard-to-process rapidly solidified alloy material. Has a complicated shape that is difficult to form by conventional methods.

[0028]

Embodiments will be described below.

Using a gas atomizing device, Al ₉₃ Ni ₆ M
A rapidly solidified Al-based alloy powder composed of m _0.9 Ag _0.1 (at%) was prepared, and the obtained Al-based alloy powder was prepared according to JIS A606.
After filling a metal capsule made of 3 alloy (Al-Mg-Si alloy), degassing was performed, the gas was placed in the container 3 of the extruder shown in FIG. 2 and extruded, and finally the coating layer was removed. And cut into appropriate lengths to prepare a billet B made of a rapidly solidified Al-based alloy. The strength of the billet B obtained here was 75 kgf / mm ² .

Next, the billet B was placed in the accommodation hole 12 of the extrusion forging device shown in FIG. 3, and heated by the heating means 14 to 500 ° C. at a temperature rising rate of 75 ° C./s. Then stem 13
Was pressed into the molding part 11 at an extrusion speed of 10 mm / s to produce a molded product 22 shown in FIG. It took 8 seconds from heating to taking out the molded product 22. Molded product 2 taken out
2 was cooled at a cooling rate of 100 ° C./s. The strength of the obtained product was 70 kgf / mm ² .

On the other hand, not only is it difficult to form by conventional simple extrusion and forging, but even if it can be formed, it has a complicated shape with a high strength of 70 kgf / mm ² as in the above embodiment. You can't get the product.

Even if a molded product is manufactured by the method shown in FIGS. 4 and 5, a complicated molded product having high strength can be obtained in the same manner as described above.

[0033]

According to the present invention, a molded product having a relatively complicated shape can be easily manufactured by using a rapidly solidified alloy material that is difficult to work, and the obtained molded product has the rapidly solidified alloy material. It has excellent mechanical properties while maintaining excellent properties.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a specific process of the present invention.

FIG. 2 is an explanatory diagram of a manufacturing process of one billet of an example.

FIG. 3 is an explanatory diagram of an extrusion forging process subsequent to FIG.

FIG. 4 is an explanatory diagram of a manufacturing process of a coated billet of another example.

FIG. 5 is an explanatory view of an extrusion forging step following FIG.

FIG. 6 is an explanatory view of forming a billet into a molded product.

[Explanation of symbols]

 1 rapidly solidified alloy material 2 easily workable metal material 3 container 4 stem 5 opening 6 coated extruded material 7 peeling blade 8 cutting blade 9 upper mold 10 lower mold 11 molding part 12 storage hole 13 stem 14 heating means 15 thermocouple 16 container 17 Insertion Hole 18 Covering Section 19 Removing Means 20 Discharging Section 21 Stem 22 Molded Product

Claims (3)

[Claims] 1. An extruded material is produced by extruding a rapidly solidified alloy material together with an easily workable metal material so that the easily workable metal material covers the surface of the rapidly solidified alloy material, and the extruded material is obtained. A method for producing a molded article, comprising removing a coating layer made of an easily workable metal material and performing plastic working. 2. The plastic working is characterized in that an extruded material is placed in a container connected to a forming part provided in a forming die, and the heated extruded material is extruded into the forming part.
A method for producing the described molded article. 3. The coating layer made of an easily processable metal material of the extruded material is removed at the extruded end portion at the time of extruded material molding or at the molded portion side of the container during plastic working. Item 3. A method for producing a molded article according to item 2.