JPH0643398A - Spectacle member - Google Patents

Abstract

PURPOSE:To provide many variations of shapes, to eliminate projecting parts and to improve beauty while maintaining the basic characteristics of a shape memory alloy by forming a part or the whole of the spectacle frame member of a shape memory alloy tube. CONSTITUTION:The spectacle frame constituted of the shape memory alloy member 1 has the drawback that this alloy lacks in plastic workability and joinability and, therefore, the spectacle member 1 is formed to a tubular shape and a member made of a different metal, for example, stainless steel, is mounted as a core material into this tube in order to solve this problem. A Ti-Ni alloy exhibiting superelasticity at a service environmental temp. is preferably used as the above-mentioned shape memory alloy tube 1. As a result, the spectacle frame which can be easily worked to a broad width without increasing the weight of the frame while maintaining the basic characteristics of the shape memory alloy and has excellent beauty without having projecting parts, etc., in appearance while having the strength equiv. to the strength obtainable by caulking and brazing of stainless steel pipes is obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shape memory alloy spectacle frame.

[0002]

2. Description of the Related Art Shape memory alloys (TiNi alloy, CuZn)
It is well known that Al alloys and the like) exhibit a remarkable shape memory effect accompanying the reverse transformation of the martensitic transformation.
It is also well known that the supertransformation shows good superelasticity in the matrix phase of reverse transformation. Since a shape-memory alloy superelastic spring has reversibility of about 7% due to elongation and strain, it has an advantage that it can be used as a spring without being formed into a coil shape, unlike stainless wires, piano wires, and the like. This linear spring material is
It has been put to practical use as a catheter guide wire. In addition, it has been put to practical use with the merits of preventing deformation and improving the shape retention of the core metal of a brassiere, the core metal of a corset, and the like.

[0003]

On the other hand, it has already been proposed to use a shape memory alloy for the members of the spectacle frame, and the deformation at the time of mounting is restored by putting it in hot water and it is difficult to cause deformation. Those using elasticity have been put to practical use. In addition, Ti-Ni alloys are mainly used for practical application of these. However, this alloy has a drawback that it lacks plastic workability and bondability. For example, when a wide member is used for the temple of the frame, it is often pressed a wire, but the limit is about 3 times the wire diameter.
In addition, thickening the wire diameter to obtain the above member makes the frame heavy. Further, when connecting the frame and the hinge, if the frame is a metal such as Monel material, it can be easily brazed. However, in the case of Ti-Ni alloy, direct brazing is difficult, and the surface of the alloy is plated with Ni. And brazing was possible by caulking a stainless steel pipe on the connecting end surface. In view of the above-mentioned drawbacks, the technical problem of the present invention is to maintain the basic characteristics of the shape memory alloy and to widen the width without making the frame heavy. It is to provide an eyeglass member that does not have an aesthetic appeal because it has no parts.

[0004]

According to the present invention, a spectacle frame at least a part of which is made of a shape memory alloy member, and a part or all of the member is a shape memory alloy tube. According to the present invention, a spectacle member characterized in that a dissimilar metal is attached as a core material to a part or all of the shape memory alloy tube, According to the present invention, there is provided a spectacle member characterized in that the shape memory alloy tube is a Ti—Ni based alloy that exhibits superelasticity at an ambient temperature.

[0005]

A spectacle frame composed of a shape memory alloy member, and the alloy has a drawback of lacking plastic workability and bondability. As a means for solving this, the shape memory alloy member is formed into a tubular shape, By mounting a dissimilar metal such as stainless steel as a core material, the problems of plastic workability and bondability were solved. That is, according to the present invention, while maintaining the basic characteristics of the shape memory alloy, it is possible to easily process a wide width without making the frame heavy, and it is possible to provide a wide variety of shapes. It is a spectacle frame that has the same strength as pipe caulking and has an excellent appearance with no protruding parts.

[0006]

【Example】

Example 1 A Ti-50.5 at% Ni alloy obtained by the high frequency vacuum melting method was processed into a solid billet and then machined into a cylinder of φ15 mm × φ11 mm. Then, using a drawing and rolling mill, φ3.0 mm × φ
It was a 2.6 mm tube. This rolling mill has two or three rolls arranged in parallel with the stretch-rolled test piece, and can freely reciprocate and rotate back and forth with respect to the test piece, and the degree of diameter processing of the test piece was connected to the rolls. The apparatus was adjusted by using a tapered guide, and a mandrel was inserted into the inner core of the cylinder of the test piece, and the stretching rolling was performed while rotating the test piece or the test piece and the mandrel independently.
Next, as shown in FIG. 1, the stainless member 2 was inserted into both ends of the tubular shape memory alloy member 1, and the end portion of the stainless member 2 was φ2.0 mm by swaging. Then, the tubular shape memory alloy member 1 is pressed for 5 m.
The width was m. After the processing was completed, heat treatment was performed at 400 ° C. for about 15 minutes to perform direct brazing with a stainless hinge.
Table 1 shows shape memory characteristics and bonding strength.

[0008]

[Table 1] Joining method: No. 1 Brazing the stainless steel inserted in the tube and the hinge No. No. 2 Hinge and brazing after Ni plating on alloy wire No. 3 Cap the stainless steel on the alloy wire and braze the cap and hinge

As a comparative example, the processed shape of the wire having the same size as the tube, the stainless pipe caulking, and Ni
The results of plating brazing are also shown. As is clear from Table 1, according to the present invention, a temple member having a joint strength equivalent to that of the conventional pipe caulking brazing and having a wide width and good shape memory characteristics was obtained. In this example, the shape memory property was examined for the resilience when bent at 90 ° C at -10 ° C and then heated to 20 ° C, and the superelasticity was examined for the spontaneous resilience after bent at 90 ° C at 20 ° C. .

<Second Embodiment> φ3.0 mm × φ of the first embodiment
FIG. 2 shows a tube of the shape memory alloy member 1 of 2.6 mm.
After processing into the shape shown in (a), heat treatment was performed at 400 ° C. for 15 minutes. The stainless steel member 2 of FIG. 2 (b) was cooled with dry ice together with the shape memory alloy member and inserted as shown in FIG. 2 (c). Then, the evaluation was performed by the same method as in Example 1, but the same result was obtained.

[0011]

In the present embodiment, an example of only Ti50.5 at% Ni alloy was shown, but the present invention is applied to the practical composition Ni: 48-52 at% (remaining Ti) of TiNi alloy,
Further, the present invention can be applied to all shape memory alloys such as TiNiX alloys containing a third element such as Fe, Cr, V, copper-based alloys and iron-based alloys. As described above, according to the present invention, it is possible to provide a spectacle frame member that maintains the basic characteristics of the shape memory alloy and has a wide variety of shapes.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a processing example (Example 1) of a shape memory alloy member of the present invention.

FIG. 2 is an explanatory view showing a working example (Example 2) of the shape memory alloy member of the present invention, and FIG. 2A is a perspective view showing the shape memory alloy member obtained by working the tube of the shape memory alloy member by pressing. FIG. 2B is a perspective view showing a stainless member to be inserted, and FIG. 2C is a perspective view showing a state in which the stainless member is inserted into the shape memory alloy member by cooling.

[Explanation of symbols]

 1 Shape memory alloy member 2 Stainless steel member

Claims (3)

[Claims] 1. A spectacles member, at least a part of which is a spectacle frame made of a shape memory alloy member, wherein a part or all of the member is a shape memory alloy tube. 2. A spectacle member, wherein a part or all of the shape memory alloy tube according to claim 1 is provided with a dissimilar metal as a core material. 3. The Ti-Ni tube of the shape memory alloy tube according to claim 1 or 2, which exhibits superelasticity at an ambient temperature.
An eyeglass member characterized by being a system alloy.