JPH06118348A - Member made of shape memory alloy and spectacle member using its member - Google Patents

Abstract

PURPOSE:To provide the member made of a shape memory alloy being excellent in durability and applicability, and the spectacle member using its member by making the most of a fundamental characteristic of the shape memory alloy. CONSTITUTION:A composite wire rod made of a shape memory alloy is formed by using plural rise wire rods made of a shape memory alloy consisting of a Ti-Ni compound alloy material for showing super-elasticity under an ordinary temperature use environment, and this composite wire rod made of a shape memory alloy is used for a temple 11, a bridge 12, a browbar part 13, etc., being spectacle members as members made of a shape memory alloy. In this case, the composite member can select and use arbitrarily a twisted wire rod, a knitted wire rod, a woven wire rod, and a non-woven wire rod (also, including a plate-like wire rod thereby), etc., and also, the wire diameter of each composite wire rod and the number of combined pieces can be varied in accordance with the respective use of the spectacle members, and moreover, a part of the combination can be alternated with other alloy, therefore, a contribution of a variation to the spectacle member, which is difficult to obtain by a conventional member made of a shape memory alloy, and improvement of its durability can be realized particularly.

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 member applicable under normal temperature use environment and a spectacle member using the shape memory alloy member such as a spectacle frame.

[0002]

2. Description of the Related Art Generally, shape memory alloys such as Ti--N are used.
i-based alloys and Cu-Zn-Al-based alloys)
It is known that a remarkable shape memory effect is exhibited in association with the reverse transformation of the martensitic transformation. Also, the shape memory alloy is
It is also known to exhibit good superelasticity in the reverse transformation matrix state.

For example, a superelastic spring made of shape memory alloy is
Since it is reversible even when the elongation strain is about 7%, it has the advantage that it can be used as a linear spring without forming a coil unlike stainless steel wire or piano wire. Since such a linear spring material has an advantage of being able to prevent deformation and improve shape retention, a catheter guide wire, a brass core bar,
It has been put to practical use as a core metal for corsets.

On the other hand, in recent years, shape memory alloys have also been used for eyeglass members such as eyeglass frames. The shape memory alloy member for normal eyeglass members, etc., has a shape memory property that allows deformation when wearing glasses to be returned to the original state by putting it in hot water,
Basically, a material having superelasticity that does not easily deform is used.

Specifically, the shape memory alloy member of the eyeglass member is mainly made of a Ti--Ni alloy material in the form of a rod having a diameter φ of about 1 to 2 mm or a crushed material. It is being appreciated.

[0006]

The conventional shape memory alloy member for eyeglass members has a drawback that it is relatively weak against repeated bending loads. Especially, when the eyeglass member having super elasticity is used, the bending strain is 3 to 4%.
Even if the durability is less than 1000 times, the durability is less than 1000 times, and if the durability is more than 1000 times, it often breaks.

Further, if the wire diameter of the used member is made smaller, the durability is improved with respect to bending under the same curvature condition as compared with the case where the wire diameter is not made small, but if the wire diameter is simply made small, the eyeglass member However, there is a problem in that the basic restraint properties (requirements for ensuring mechanical strength such as flexibility) required for are lacking.

The present invention has been made to solve the above problems, and its technical problem is to make use of the basic characteristics of a shape memory alloy and to provide a shape memory alloy member excellent in durability and applicability. It is to provide a spectacle member using the.

[0009]

According to the present invention, a shape memory alloy composite wire formed by using a plurality of shape memory alloy wire made of a Ti-Ni alloy material exhibiting superelasticity under normal temperature use environment. And a member made of a shape memory alloy including the additional member bonded to the composite wire made of the shape memory alloy.

On the other hand, according to the present invention, in a spectacle member at least a part of which is a shape memory alloy member, a spectacle member using a shape memory alloy composite wire for some or all of the shape memory alloy member. The member is obtained.

Further, according to the present invention, in the above-mentioned eyeglass member, the shape memory alloy composite wire rod is obtained which is made of a Ti—Ni based alloy material which exhibits superelasticity under a normal temperature use environment.

[0012]

EXAMPLES The shape memory alloy member of the present invention and the spectacle member using the same will be described in detail below with reference to the drawings.

The shape-memory alloy member of the present invention is a shape-memory alloy composite wire formed by using a plurality of shape-memory alloy rising wires made of a Ti--Ni alloy material that exhibits superelasticity at room temperature. An eyeglass member is used as an example of the shape memory alloy member used for a part or all of the shape memory alloy.

In the case of the eyeglass member, at least a part of the member is made of a shape memory alloy, and further, a part or all of the shape memory alloy member is made of Ti-Ni which exhibits superelasticity under normal temperature use environment. A shape-memory alloy composite wire rod made of a system alloy material is used. However, here, the composite wire material indicates a deviation wire material, a knitting wire material, a woven wire material, a non-woven wire material, and the like.

Therefore, the shape memory alloy member including the shape memory alloy composite wire and the eyeglass member using the same will be specifically described below.

First, Ti-5 was prepared by a high frequency vacuum melting method.
After obtaining a 0.5 at% Ni alloy material, the alloy material is hot-worked or cold-worked so that the diameter φ is 0.5 mm.
The obtained wire rod made of shape memory alloy was obtained. Next, using this rising wire rod, various wire rods 1 to 8 were prepared as follows. However, the Ti-Ni alloy materials of the examples show superelasticity under normal temperature use environment, and the first to sixth wire rods are composed of the composite wire rods of the present invention, The seventh and eighth wire rods are composed of a single wire rod as a comparative example.

As shown in the side view of FIG. 1 (A) and the sectional view of FIG. 1 (B), the first composite wire rod has seven rising wire rods 1 and a diameter φ of 1. It is a biased wire rod that is bundled so as to be 5 mm. The second composite wire rod is a bias plate wire rod (not shown) having a thickness of 0.7 mm obtained by pressing the bias wire rod.

Further, as shown in the side view of FIG. 2 (A) and the sectional view of FIG. 2 (B), the third composite wire rod has seven rising wire rods 1 and a diameter φ of 1. It is a knitted composite wire knitted to have a length of 5 mm. The fourth composite wire is
It is a knitted plate wire (not shown) having a thickness of 0.7 mm obtained by pressing a knitted composite wire.

Further, as shown in a plan view of FIG. 3 (A) and a sectional view of FIG. 3 (B), the fifth composite wire rod has seven rising wire rods 1 in the warp thread and fluororesin Teflon)
2 is a woven plate-shaped wire rod having a thickness of 0.7 mm by a weaving machine. As shown in the plan view of FIG. 4 (A) and the sectional view of FIG. 4 (B), the sixth composite wire rod has seven warp yarns 1 arranged on the warp yarn, and these are arranged with a Teflon sheet 2 '. It is a non-woven plate-shaped wire rod having a thickness of 0.7 mm.

The seventh and eighth single wire rods are comparative examples (neither is shown), and the seventh single wire rod has a diameter φ of 1.
This is a 5 mm shape-memory-alloy rising single wire rod, and the eighth single wire rod is a crushed plate-like wire rod having a thickness of 0.7 mm obtained by pressing this rising wire rod.

Subsequently, each of the first to eighth composite wires and each single wire is heated at a temperature of 400 ° C. for 10 times.
After heat treatment for 1 minute, repeated bending test (1) with the same curvature under 0 ° C, 20 ° C and 60 ° C
By performing a 0R bending test), the shape memory property was examined to examine the life (durability) of each composite wire and each single wire. Table 1 shows the results of this durability.

[0022]

[Table 1]

From Table 1, the first to sixth composite wire rods of the present invention show good spontaneous shape recovery after bending release, as indicated by a circle in the shape memory column. Also has a super-elasticity and a long life of 2000 times or more, whereas the seventh and eighth single wire rods as comparative examples are strained after being released from bending, as indicated by a triangle in the shape memory column. However, it was found that the product had a short life of about 400 to 500 times without exhibiting good superelasticity.

Therefore, suitable wire rods for the shape memory alloy member of the present invention are the first to sixth composite wire rods,
The 7th and 8th single wire rods which are comparative examples are excluded.

Incidentally, it was found that the Teflon material used in the fifth and sixth composite wire rods hardly decomposed thermally at a temperature of 400 ° C. and did not impair the shape memory property at all. Incidentally, the reason why each single wire of the comparative example does not exhibit good superelasticity is that the alloy density per unit cross-sectional area is larger than that of each composite wire of the present invention, and therefore the heat treatment is not sufficiently performed. To be done.

Therefore, an arbitrary combination of the first to sixth composite wire rods suitable as the shape memory alloy member of the present invention was used and applied to the eyeglass member.

FIG. 5 is a perspective view showing the appearance of eyeglasses including the eyeglass member of the present invention. However, the spectacles member here indicates a spectacles frame which is all the constituent parts of the spectacles except the lenses A and B, and the spectacles frame includes the temples 11 extending from both ends of the lenses A and B and the lenses. It is configured to include a bridge 12 and a transition portion 13 and the like installed on both ends of the A and B frames.

Among them, for the temple 11 and the bridge 12, any arbitrary combination of the above-mentioned composite wire rods is used, and for the crossover portion 13, the same process as the formation of the first composite wire rod is performed. Various spectacle frames were constructed by using the three rising wire rods 1 and the leaning wire rods bundled by the leaning wire machine.

Any type of spectacles having a spectacle frame has the same function as those other than the conventional shape memory alloy member, is strong against repeated bending loads, and has excellent durability. It turned out to be.

In the examples, Ti-50.5 at% Ni
Although the case where the alloy material is used has been described, the Ti—Ni alloy material, which includes a material exhibiting a shape memory effect at room temperature, has a general practical composition of Ni: 48-52a.
It is also applicable to the case of t% (remaining Ti) and other practical compositions, and further, a Ti-Ni-X alloy (where X is Fe is added) in which a third element such as Fe, Cr, or V is added. , Cr,
V) and all shape memory alloy materials such as copper-based alloys and iron-based alloys, the present invention is not limited to the examples. That is, the shape memory alloy member of the present invention can be applied to a case in which an additional member is added to the shape memory alloy composite wire rod formed by using a plurality of shape memory alloy rising wire rods.

[0031]

As described above, according to the present invention, the shape memory alloy composite wire which maintains the basic characteristics of the shape memory alloy, has a wide variety of shapes, is excellent in durability, and is highly applicable. A shape memory alloy member made of is obtained. In particular, when this shape memory alloy member is used as a spectacle member, a deviated wire rod, a braided wire rod, a woven wire rod, and a non-woven wire rod (including a plate-shaped wire rod made of these) are added to the shape memory alloy composite wire rod. In addition to being able to be arbitrarily selected and used, the wire diameter of each composite wire rod and the number of combinations can be changed according to each application of the eyeglass member, and a part of the combination can be replaced with another alloy, Contribution of variations to the spectacle member, which has been difficult to obtain with the conventional shape memory alloy member, and improvement in durability thereof can be remarkably achieved.

[Brief description of drawings]

FIG. 1 is a view showing a side plate-shaped wire rod of a composite wire rod forming a shape memory alloy member of the present invention, (A) showing a side view thereof, and (B) showing a sectional view thereof. .

FIG. 2 is a view showing a knitting composite wire of a composite wire material forming a shape memory alloy member of the present invention, (A) showing a side view thereof,
(B) is a sectional view thereof.

FIG. 3 is a diagram showing a woven plate-shaped wire rod of a composite wire rod forming the shape memory alloy member of the present invention, (A) showing a plan view thereof, and (B) showing a sectional view thereof. .

FIG. 4 is a view showing a non-woven plate-shaped wire rod of a composite wire rod forming the shape memory alloy member of the present invention, (A) showing a plan view thereof, and (B) showing a cross-sectional view thereof. is there.

FIG. 5 is a perspective view showing the appearance of eyeglasses including the eyeglass member of the present invention.

[Explanation of symbols]

 11 Temple 12 Bridge 13 Crossover A, B lens

Claims (3)

[Claims] 1. A Ti-N that exhibits superelasticity under normal temperature use environment.
Shape memory alloy comprising: a shape memory alloy composite wire formed by using a plurality of shape memory alloy wire made of an i-based alloy material; and an additional member coupled to the shape memory alloy composite wire. Made parts. 2. A spectacle member, at least a part of which is a shape memory alloy member, wherein a shape memory alloy composite wire is used for a part or all of the shape memory alloy member. Element. 3. The spectacle member according to claim 2, wherein the shape-memory alloy composite wire is made of a Ti—Ni-based alloy material that exhibits superelasticity under a normal temperature use environment.