JP3109260B2 - Method for producing superelastic wire made of nickel / titanium alloy - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a nickel-titanium alloy superelastic wire.

[0002]

2. Description of the Related Art In recent years, using a nickel-titanium alloy, which is a kind of shape memory alloy, to produce superelastic parts, for example, eyeglass frames, has been performed. In this case, as the nickel-titanium-based alloy superelastic material used for the manufacture of the component, a material obtained by melting a nickel-titanium-based alloy and forging and forming the material is used. ing. For example, when manufacturing an eyeglass frame, a nickel-titanium-based alloy superelastic wire rolled to a diameter of about 1.0 mm to 3.0 mm is used as the material, and the wire is swaged. It is formed into a predetermined part shape and is subjected to surface finishing.

[0003]

However, in the prior art, nickel-titanium-based alloys have relatively low ductility and malleability, so that it is difficult to obtain the rolling efficiency of the above-mentioned material, and the material is rolled. There is a problem that the surface of the resulting nickel-titanium alloy superelastic wire is scratched and the rolling yield decreases.

When it is necessary to join another metal part to a part processed from the above-described nickel-titanium-based alloy superelastic wire, the nickel-titanium alloy must be joined to the nickel-titanium alloy super-elastic wire. Since nickel plating is locally applied to a portion of a part processed from a titanium-based alloy superelastic wire that requires joining, there has been a disadvantage that the manufacturing process and cost of the part are increased.

The present invention has been made in view of the above circumstances, and an object of the present invention is to improve the rolling efficiency of a nickel-titanium alloy material and to roll the material. The nickel-titanium alloy superelastic wire can reduce the surface flaws and increase the rolling yield, while the nickel-titanium alloy superelastic wire is not locally plated with nickel. It is another object of the present invention to provide a method for producing a nickel-titanium-based alloy superelastic wire that can be brazed.

[0006]

The gist of the present invention to achieve the above object is to provide a nickel-titanium alloy superelastic wire by rolling a nickel-titanium alloy material. A method of manufacturing, which comprises coating a nickel layer on the surface of the material before rolling the material.

[0007]

According to the method for producing a nickel-titanium alloy superelastic wire of the present invention having the above-described structure, the surface of a nickel-titanium alloy material is coated with a nickel layer. By rolling a nickel-titanium-based alloy material coated with a nickel-titanium-based alloy, a nickel-titanium-based alloy superelastic wire can be manufactured, so that the frictional resistance during rolling can be suitably reduced by the lubricating action of the nickel layer. Thus, the rolling efficiency of the raw material can be suitably improved, and the scratch on the surface of the manufactured nickel-titanium alloy superelastic wire can be suitably reduced, and the rolling yield can be increased.

[0008] Further, since the nickel film formed by the nickel layer is formed on the surface of the nickel-titanium alloy superelastic wire manufactured as described above, it is processed from the nickel-titanium alloy superelastic wire. In the case where other metal parts are joined by brazing to the parts that have been joined, the parts that need to be joined can be brazed without locally applying nickel plating as in the past. Can be suitably reduced in the manufacturing process and cost.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

In FIG. 1, reference numeral 10 denotes a nickel / titanium-based alloy-made elongate vine which constitutes a part of an eyeglass frame, has a wide flat portion 12 at one end, and has a wide flat portion 12 at the other end. Has a curved portion 14. This vine member 10
A metal hinge 16 is joined to one surface side of the wide flat portion 12. The nickel / titanium-based alloy constituting the vine member 10 is known as a so-called shape memory alloy, and its superelasticity and lightness are used to enhance the wearing feeling of the eyeglass frame.

The vine member 10 to which the hinge 16 is joined
Is manufactured, for example, according to the process shown in FIG.

First, a longitudinal block-shaped material 18 made of a nickel-titanium alloy and a cylindrical material 2 made of nickel
Prepare 0. The raw material 18 is prepared by, for example, adding cobalt or vanadium to nickel and titanium, melting in a vacuum induction furnace, and then forging a metal lump obtained by melting in a vacuum arc furnace at a temperature of about 700 ° C to 900 ° C. Is obtained by molding into a long block shape having a square cross section of, for example, about 92 mm on one side, and then removing the skin. For example, 88 mm × 88 mm × 1000
mm (length). In addition, the cylindrical member 20
Is formed by, for example, hot extrusion, has a square hole 22 into which the material 18 can be fitted so that there is almost no gap, and has a thickness of several mm to several tens mm. And has the same length as the material 18.

Next, the material 18 is inserted into the hole 2 of the cylindrical member 20.
2, the surface of the material 18 is covered with a nickel layer 24 made of the cylindrical material 20. Then, the material 18 coated with the nickel layer 24 is subjected to hot rolling in a plurality of stages at a temperature of, for example, about 950 ° C. using a plurality of types of rollers in order, for example, from 4.5 mmφ to 12.5 mm.
A wire 26 having a diameter of about mmφ is primarily obtained, and the wire 26 is further subjected to warm rolling at a temperature of, for example, about 400 ° C. to 450 ° C., thereby further reducing the diameter of the wire 1 mm to 3 mm.
A wire 28 of about mmφ is obtained. On the surfaces of these wires 26 and 28, a nickel coating 3 composed of the nickel layer 24 is provided.
0 (only the wire 26 is shown), and the wire 28 has a thickness of, for example, several tens μm to several thousand μm. In this embodiment, the wire 28 constitutes a nickel-titanium alloy superelastic wire.

Next, after the wire 28 is cut to a predetermined length, the wire 28 having the predetermined length is subjected to swaging in a plurality of stages as necessary, so that the wide flat portion is provided at one end. A straight vine member 32 having 12 is formed. Then, the wide flat portion 12 of the linear vine member 32 is formed.
For example, silver solder (BA of JIS Z 3261)
g, melting point: about 650 ° C. to 800 ° C.)
To join. In this case, the silver solder has low wettability with respect to the nickel-titanium alloy and cannot be brazed, but the nickel coating 30 is formed on the surface of the wide flat portion 12 of the linear vine member 32 made of the nickel-titanium alloy. It is formed and the wettability of silver solder to the nickel film 30 is high, so that the presence of the nickel film 30 enables brazing bonding to the linear vine member 32 made of nickel / titanium alloy. . The linear vine member 32 to which the hinge 16 is joined is further subjected to a predetermined surface finishing process. In this surface finishing, if necessary, the linear vine member 32 Is removed, and a film of a predetermined metal is formed by ionization plating, sputtering, or the like.

Next, the bending portion 14 is formed by bending the other end of the linear vine member 32 to obtain the vine member 10 shown in FIG.

As described above, according to this embodiment, nickel
A nickel layer 24 is formed on the surface of a material 18 made of a titanium-based alloy.
After coating, the material 18 coated with the nickel layer 24 is sequentially rolled to produce a nickel-titanium-based alloy superelastic wire 28, so that the nickel layer 2
The frictional resistance during rolling is suitably reduced by the lubricating action of No. 4, whereby the rolling efficiency of the raw material 18 is suitably improved, and the scratches on the surface of the manufactured wire 28 are suitably reduced. The rolling yield can be increased.

Here, Tables 1 and 2 show the above-mentioned effects in the case where the wire rod 28 is manufactured from the raw material 18.
This is an example of the primary rolling for producing the wire rod 26 in the previous stage. As can be seen from these tables, according to the present embodiment, the rolling efficiency (rolling speed) is 35% as compared with the case where a conventional nickel-titanium alloy material having no nickel film is used. Along with the increase, the number of surface flaws of the wire 26 was greatly reduced regardless of the size of the flaw, and the rolling yield increased by about 16%.

[0018]

[Table 1]

[0019]

[Table 2]

Further, according to this embodiment, the nickel coating 30 is formed on the surface of the nickel-titanium alloy superelastic wire 28.
Is formed, the nickel film 30 is also formed with a predetermined thickness on the surface of the linear vine member 32 machined from the wire rod 28, whereby the linear vine member 32 is formed.
When the hinge 16 is brazed to one surface of the wide flat portion 12, it is possible to perform brazing without applying nickel plating locally to a portion where the wide flat portion 12 needs to be joined as in the conventional case. Therefore, the manufacturing process and cost of the vine member 10 and the eyeglass frame including the vine member 10 can be suitably reduced.

Further, according to the present embodiment, the material 18 is fitted into the nickel tubular material 20 so that the material 18
Is coated with a nickel layer 24, so that the thickness of the nickel layer 24 and thus the thickness of the nickel film 30 of the wire rod 28 and the vine member 10 can be easily increased to such an extent that lubricity during rolling can be sufficiently increased. There are advantages that can be done.

Although the embodiment of the present invention has been described with reference to the drawings, the present invention can be applied to other embodiments.

For example, in the above-described embodiment, the cylindrical member 2 having the material 18 having a square cross section in a direction perpendicular to the longitudinal direction and the square hole 22 into which the material 18 can be fitted.
Although 0 is used, it is not always necessary. For example, a columnar nickel-titanium-based alloy material and a nickel cylindrical material having a circular hole into which the material can be fitted may be used.

In the above-described embodiment, the material 18 made of a nickel-titanium alloy is fitted into a cylindrical member 20 made of nickel, so that the surface of the material 18 is covered with a nickel layer 24. However, the surface of the material 18 may be plated with nickel to cover the nickel layer. In this case, the nickel layer is formed to a thickness of, for example, several tens μm to several hundreds μm.

In the above-described embodiment, the vine member 10 of the eyeglass frame is machined from the nickel-titanium alloy superelastic wire 28. However, if the brazing joint is required, the eyeglass frame may be formed. It goes without saying that the effects of the present invention can also be obtained when processing members other than the above-mentioned members and eyeglass frames.

In addition, the present invention can be variously modified without departing from the gist thereof.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a vine member of an eyeglass frame processed from a nickel-titanium alloy superelastic wire manufactured by the manufacturing method of FIG. 2 through a straight vine member shown in FIG. 2; It is a figure which shows the state which was joined.

FIG. 2 is a view for explaining an example of steps of a method for producing a nickel-titanium alloy superelastic wire of the present invention,
It is a figure also showing the linear vine member of the glasses frame processed from the wire.

[Explanation of symbols]

 18 material 24 nickel layer 28 wire (nickel-titanium alloy super-elastic wire)

Claims (1)

(57) [Claims] 1. A method for producing a nickel-titanium alloy superelastic wire by subjecting a nickel-titanium alloy material to rolling, wherein the surface of the material is rolled prior to rolling the material. A method for producing a superelastic wire made of a nickel-titanium alloy, comprising: coating a nickel layer on a nickel-titanium alloy.