JP2002331313A - Spinning work method for highly activated metal material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spinning work method for highly activated metal materials such as magnesium alloy and titanium alloy capable of achieving the spinning work without causing rapid oxidization of these metal materials. SOLUTION: In the spinning work method by which a drawing work can be performed with drawing tools while heating, holding and rotating high activated metal materials, the drawing work section to put into contact with drawing tools is put in an atmosphere of inert gas. The atmosphere can be realized by feeding the inert gas through an inert gas supply tube to the drawing work section. The inert gas used here is nitrogen gas, argon gas and helium gas.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for spinning a highly active metal material having a high metal activity such as a magnesium alloy and a lithium alloy. More specifically, the present invention relates to a method for spinning a highly active metal material such as a magnesium alloy or a lithium alloy, which can be spinned without causing metal oxidation of the metal material.

[0002]

2. Description of the Related Art In general, wheels for aircraft or automobiles,
Aluminum alloys are used for parts such as fuel tanks to reduce the weight, but use of magnesium alloys has recently been attempted for further weight reduction. However, magnesium alloys are lighter than aluminum alloys, but have rigidity and poor ductility,
Spinning often resulted in cracks.

[0003] Therefore, in order to impart ductility to a magnesium alloy to be spin-processed, a magnesium alloy mainly composed of magnesium is formed into a structure having a fine grain size in which superplasticity of 400 microns or less is developed. On the other hand, a spinning method of a magnesium alloy, which is heated and held in a superplastic temperature range by a heating means such as a gas burner or heated air, has already been developed (Japanese Patent Laid-Open No.
00-1226827).

[0004]

However, in this processing method, there are four magnesium alloys applicable to spinning.
It is limited to those having a superplastic structure of not more than 00 microns, and cannot be applied to a normal magnesium alloy mainly composed of magnesium.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention applies a drawing tool to a plate made of a highly active metal material and gives a relative movement between the plate and the tool to perform drawing. In the spinning method to be performed, the drawn portion in contact with the drawn tool is characterized by being set in an inert gas atmosphere.

The term "highly active metal material" as used herein means a metallurgical material having a high metal oxidation activity and in which rapid metal oxidation easily occurs. For example, a magnesium alloy, a lithium alloy, a beryllium alloy, or the like corresponds thereto. In addition, any of the above-mentioned alloys can be used as long as they have a generally used composition and composition ratio. For example, in the case of a magnesium alloy, Mn 4.7%, Al 1.9%, Zn 1.
1%, Si 1.0%, Cu 0.1%, Ni 0.03%
And a magnesium alloy consisting of Mg (AZ31-
0) can be used.

The term "inert gas" as used herein means that a spark generated by drawing with a drawing tool ignites metal powder or flake-like highly active metal burrs and suppresses rapid metal oxidation. Any inert gas can be used. Specifically, nitrogen gas, argon gas, helium gas or the like can be used.

In the present invention, an inert gas is supplied through an inert gas supply pipe arranged near the drawing portion by the drawing tool, so that the drawing portion to be joined to the drawing tool is in an inert gas atmosphere. . The supply of the inert gas is appropriately set in consideration of the area of the drawn portion within a range in which the supplied inert gas does not affect the heating means for heating and holding the drawn portion. Specifically, the range is preferably about 1 to 10 L / min. In the case of spinning the open end of the cylindrical body of a highly active metal material, the thin active metal burr formed directly on the periphery of the open end due to the drawing by the drawing tool is not directly applied. It is preferable to be configured to blow the active gas.

As the heating means of the present invention, a heating means used for spinning a general metal material such as a gas burner, heated air or the like can be used. Preferably, the heating means is arranged so as to locally heat the drawn portion.

According to the spinning method according to the present invention,
While it is rigid, lightweight and recyclable,
Highly active metal materials, such as magnesium alloys and lithium alloys, which have poor ductility and are difficult to process, can be spinned safely by suppressing rapid metal oxidation. For this reason, pressure vessels using ultra-light and high-strength metal materials, for example, natural gas vehicles, hydrogen vehicles, aircraft, and even fuel gas containers such as artificial satellites and automobiles, aircraft wheels, etc. can be reliably and simply manufactured in a simple process. It can be safely supplied in large quantities.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 are schematic diagrams showing the outline of the spinning method according to the present invention. In this overview diagram,
FIG. 1 shows an example of spinning an open end of a cylindrical body made of a plate formed by extruding a highly active metal material. FIG. 1 shows an outline of a process immediately before spinning, and FIG.
Shows an outline of the process in the middle of the spinning process, and FIG. 3 shows an outline of the final process of the spinning process.

In FIG. 1, reference numeral 10 denotes a cylindrical body formed by extruding a highly active metal material and having both ends 11, 12 opened. Reference numeral 20 denotes a drawing tool formed of a drawing roll that bends the drawn portion 13 near one open end 11 of the cylindrical body 10 in the central axis X direction. Reference numeral 30 denotes a part inserted from the open end 11 and the drawn part 13
2 shows an inert gas supply pipe of an inert gas G for supplying an inert gas in the vicinity of. Reference numeral 40 denotes a gas burner for local heating arranged at a position facing the squeezing roll 20.

First, one open end 12 of the cylindrical body 10 is fixed to a chuck provided on a rotating shaft of a spinning machine (not shown) for spinning, and an inert gas is supplied from the other open end 11. The supply pipe 30 is inserted to supply the inert gas G into the inside of the cylindrical body 10 at a rate of about 1 to 10 L / min. The supplied inert gas G has one opening end 12 closed by the chuck.
It overflows from the other open end 11. In this state, while the rotating shaft of the spinning machine is rotated in the direction shown in the drawing and the cylindrical body 10 is slowly rotated, the drawn portion 13 of the opening end 11 is heated by the gas burner 40 for local heating ( (Fig. 1).

When the drawing section 13 is heated to about 300 degrees, the squeezing roll 20 is pressed against the drawing section 13 while the rotation of the tubular body 10 is continued, so that the cylindrical body and the squeezing roll 20 are separated from each other. By applying a relative movement between the two, the drawn portion 13 is drawn so as to bend in the direction of the axis X (FIG. 2). In this case, metal powder and sparks are generated from the contact surface between the squeezing roll 20 and the cylindrical body 10. However, since the inert gas G overflows very little from the opening end 11, the metal powder and the opening end The part 11 does not burn violently.

When the spinning process is continued so that the opening end portion 11 has a desired diameter, a thin active metal burr is formed on the peripheral portion 14 of the drawn portion 13, and the high active metal burr is formed. There is a risk of burning due to intense metal oxidation. For this reason, in the present embodiment, the inert gas supply pipe 30 inserted into the cylindrical body 10 is formed as the drawn portion 13 is spinned to a desired thickness and a desired diameter.
Is gradually retracted from the opening end 11, and the outlet 31 of the inert gas supply pipe is
From the front to the position where the inert gas is directly supplied (FIG. 3). As a result, it is possible to prevent the highly active metal burrs formed by the spinning process from burning violently or from burning and deforming the peripheral portion 14.

FIG. 4 shows another embodiment of the spinning process according to the present invention. In this embodiment, the outlet 31 of the inert gas supply pipe 30 is disposed in front of the drawing section 13 that comes into contact with the drawing roll 20. And
The inert gas supply pipe 30 is provided with an elevating device (not shown). The spinning process causes the drawn portion 13 to bend and deform in the direction of the axis X in accordance with the spinning process.
The position of the inert gas supply pipe 30 is changed in the direction of the arrow, so that the blowout port 31 is always moved forward of the peripheral edge portion 14 of the drawing section 13 which comes into contact with the drawing roll 20.

In this embodiment, the inert gas G is constantly supplied from the front of the peripheral portion of the drawing portion 13 which comes into contact with the drawing roll 20 which is bent and deformed in the direction of the axis X with spinning. Therefore, since the flaky highly active metal burrs formed in the spinning process are always in an inert gas atmosphere, they do not oxidize metal and burn violently, thereby improving the safety of the spinning process.

Hereinafter, an embodiment of the spinning method for a highly active metal material according to the present invention will be described, but the present invention is not limited to this embodiment.

[0019]

EXAMPLE As a test material of a highly active metal material, M
n 4.7%, Al 1.9%, Zn 1.1%, Si 1.0
%, Cu 0.1%, Ni 0.03%, and a magnesium alloy plate (AZ31-O) made of Mg with the balance being extruded to have a longitudinal length of 600 mm, a thickness of 3 mm, and a diameter of 100 mm.
A magnesium alloy cylindrical body having both ends of mm opened. One open end of this magnesium alloy cylindrical body,
It is fixed to a chuck provided on a rotating shaft of a spinning machine for spinning, and an inert gas supply pipe is inserted from an open end of the other end as shown in FIG. A gas burner for local heating for heating the drawn part was arranged.

In this state, while supplying nitrogen gas at a rate of 1 liter / minute from the inert gas supply pipe, the rotating shaft of the spinning machine is rotated at a rate of 8 rotations / minute, and the temperature of the drawing portion is reduced to about When the temperature reaches 300 degrees, the drawing roll is pressed against the drawing portion, and the opening end is bent toward the center of the diameter in the process shown in FIGS.
mm.

As a result, a through hole with a diameter of 40 mm having a thick wall at the center could be formed. During spinning, metal powder was generated from the drawn portion, but did not ignite. Also, in the spinning process, a number of flakes of highly active metal burrs were formed from the periphery of the drawn portion, but these metals did not oxidize and burn, resulting in a plastic deformation of 100% or more in strain. Was manufactured.

In the embodiment shown in FIG. 4, the inert gas supply pipe 30 is used as a means for suppressing the highly active metal burrs formed on the peripheral portion 14 of the drawn portion 13 from burning due to metal oxidation. Although the position of the outlet 31 is changed, instead of this configuration, the outlet 31 of the inert gas supply pipe 30 is provided with an inert gas blowing direction adjusting means for changing the blowing direction of the inert gas, It is also possible to adopt a configuration in which an inert gas is always blown to the peripheral edge portion 14 in response to the deformation of the drawn portion 13.

Further, by applying the spinning method described in the embodiment to the other open end of the magnesium alloy cylindrical body, a through wall having a thick wall at the center of both ends is provided. Since a hole can be formed, an ultra-light and high-strength pressure vessel can be manufactured by subjecting this through-hole to processing such as a screw hole for bubble connection using a conventionally known processing means. In this case, in order to reinforce the strength of the pressure vessel, the outer surface of the pressure vessel may be integrally coated with high-strength fibers such as carbon fiber and glass fiber.

[0024]

According to the spinning method of the present invention, spinning of a highly active metal material such as a magnesium alloy having a high metal activity is performed in an atmosphere of an inert gas. No accidental combustion occurs at the periphery of the processed part. For this reason, pressure vessels using ultra-light and high-strength metal materials, for example, natural gas vehicles, hydrogen vehicles, aircraft, and even fuel gas containers such as artificial satellites and automobiles, aircraft wheels, etc. can be reliably and simply manufactured in a simple process. It can be safely supplied in large quantities.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an outline of a process immediately before spinning according to the present invention.

FIG. 2 is a schematic diagram showing an outline of a step in the middle of spinning according to the present invention.

FIG. 3 is a schematic diagram showing an outline of a final step of the spinning process according to the present invention.

FIG. 4 is a schematic diagram showing another embodiment according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Cylindrical body 11, 12 Open end part 13 Drawing part 14 Peripheral part 20 Squeezing roll 30 Inert gas supply pipe 31 Outlet 40 Heating means

 ──────────────────────────────────────────────────の Continued on the front page (71) Applicant 399042063 Kyoritsu Kogyo Co., Ltd. 2-6-15-1 Hashimotodai, Sagamihara-shi, Kanagawa (74) One of the above agents 100082304 Patent Attorney Matsumoto Takeshi (72) Inventor Yoshihara Shoichiro 1220-2 Nukuda-cho, Hachioji-shi, Tokyo Inside the National College of Technology (72) Inventor Masanori Kawahara 6-31-13, Shinkawa, Mitaka-shi, Tokyo (72) Inventor Hiroshi Katayama 2-3-3 Mita, Minato-ku, Tokyo 34-1608

Claims (8)

[Claims] In a spinning method in which a drawing tool is applied to a plate of a highly active metal material and a drawing is performed by giving a relative movement between the plate and the tool, a drawing processing section which comes into contact with the drawing tool is provided. A spinning method for a highly active metal material, wherein the spinning is performed under an inert gas atmosphere. 2. The spinning method for a highly active metal material according to claim 1, wherein the highly active metal material is a cylindrical body. 3. A step in which the atmosphere of the inert gas is formed by an inert gas supplied from an outlet of an inert gas supply pipe inserted into the cylindrical body; A step of forming with an inert gas supplied from the blow-out port moving forward of a peripheral portion of the drawn portion in response to the deformation of the drawn portion. Spinning method for metal materials. 4. An inert gas supplied from an inert gas supply pipe which is disposed in front of the drawn portion and which changes a blowing direction in response to deformation of the drawn portion. 3. The method of spinning a highly active metal material according to claim 2, wherein the method is formed of a gas. 5. The spinning method for a highly active metal material according to claim 4, wherein the change in the blowing direction is performed by changing the position of the inert gas supply pipe. 6. The highly active metal material according to claim 1, wherein the inert gas comprises at least one selected from nitrogen gas, argon gas, and helium gas. Spinning processing method. 7. The spinning method for a highly active metal material according to claim 1, wherein the inert gas is supplied at a rate of 1 to 10 liters / minute. 8. The spinning method for a highly active metal material according to claim 1, wherein the highly active metal material mainly contains at least one selected from lithium, beryllium, and magnesium.