JPH09249928A - Superelastic element and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and inexpensively produce a superelastic element hard to break as that for an antenna or the like by forming a projecting part with various shapes on the edge part in the longitudinal direction of a long size wire rod of an Ni-Ti alloy having a specified compsn. SOLUTION: On the edge part of a wire rod 3 of a shape memory alloy having a compsn. contg., by atom, 50 to 51% Ni, and the balance Ti or having a compsn. contg. 49.50 to 51% Ni, at least one kind among Cr, V and Co by 0.1 to 2%, and the balance Ti, a projecting part 4 with a circular shape, square shape, oval shape or the like is formed in the radial direction of the wire rod by one stage upsetting, by which, e.g. an antenna superelastic element for a portable telephone is produced. The projecting part 4 has a circular shape, oval shape, polygonal shape or the combined shape therewith and is formed for preventing its slipping-off from a telephone or the like. This superelastic element made of the Ni-Ti shape memory alloy has superelastic characteristics in the temp. range of -40 to 80 deg.C and is free from defects of being easily broken or the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a superelastic element and a method for manufacturing the same, and more particularly to a superelastic element used for an antenna, a spectacle frame, etc. and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, stainless wire or piano wire has been used as an antenna element provided in a mobile phone or the like. However, a stainless wire has a drawback that it is easily broken, and a superelastic wire made of Ni-Ti has come to be used.

FIG. 7 is a vertical sectional view of a conventional antenna.
8 is a diagram showing the antenna element of FIG.

Referring to FIG. 7, an antenna 50 is provided with an antenna element 51 and a top portion 60 made of resin with one end embedded therein.

Referring to FIG. 8, the antenna element 51 is
One end 54 of the superelastic wire 52 is softened and annealed, and rings 53 are attached to this part, and the parts of the wire 52 corresponding to both ends of the ring 53 and the ring 53 are caulked simultaneously,
It is manufactured by forming the protrusion 55.
Here, one end of the antenna element 51 is crimped to prevent the resin from coming off the top portion.

[0006]

However, although it is conceivable to subject the antenna element 51 to the crushing process described above, there is a drawback in that the resin is not caught easily and the top portion comes off.

Further, if the antenna element 51 described above can be made to have a shape like a nail head, for example, the crushing process is not required as described above, and a metal ring is used as the wire rod. There is no need to attach it to the end of and crimp it.

Further, considering the rotation stop of the resin top portion, it is considered that the one end portion preferably has a complicated shape other than the round shape.

Therefore, a technical object of the present invention is to provide a super-elastic element having the advantages that the number of parts can be omitted and it is hard to break, and a manufacturing method thereof.

Further, another technical problem of the present invention is
It is an object of the present invention to provide a superelastic element that has a small number of manufacturing steps, is easy to manufacture, and can reduce manufacturing costs, and a manufacturing method thereof.

[0011]

According to the present invention, the superelastic alloy is made of a substantially elongated superelastic alloy, and the superelastic alloy has a part or an end in the longitudinal direction substantially made of the superelastic alloy. A superelastic element is obtained which is characterized in that it has a protruding portion that radially protrudes.

Further, according to the present invention, in the superelastic element, the projection has a polygonal cross section, an ellipse including a circle, or a combination of these elements. The device is obtained.

Further, according to the present invention, in any of the above superelastic elements, a superelastic element having at least superelastic characteristics within a temperature range of -40 to 80 ° C can be obtained.

Further, according to the present invention, in any one of the superelastic elements described above, the superelastic element is obtained in which the superelastic alloy has shape memory characteristics.

According to the present invention, in the superelastic element, the superelastic alloy is 50 to 51 at% Ni and the balance is substantially Ti, or 49.5 to 51 at% Ni,
A superelastic element is obtained which is characterized in that 0.1 to 2 at% X (where X is at least one of Cr, V and Co) and the balance is substantially Ti.

Further, according to the present invention, an antenna element characterized by using any one of the above superelastic elements can be obtained.

Further, according to the present invention, a spectacle frame characterized by using any one of the above-mentioned superelastic elements can be obtained.

Further, according to the present invention, a core material characterized by using any one of the above superelastic elements can be obtained. Here, the core material refers to a core material used for a catheter guide wire, clothes, etc., but is not limited to these.

Further, according to the present invention, the superelastic alloy is composed of a substantially elongated superelastic alloy, and the superelastic alloy is formed from a part or an end portion in the length direction in a substantially radial direction. A method of manufacturing a superelastic element having a protruding portion protruding to the front, wherein the protruding portion is formed by performing a first process by at least one step upsetting process. A manufacturing method is obtained.

Further, according to the present invention, the superelastic alloy is composed of a substantially elongated superelastic alloy, and the superelastic alloy is formed in a substantially radial direction of the superelastic alloy from a part or an end in the longitudinal direction. A method of manufacturing a super-elastic element having a protruding portion protruding to the bottom, wherein the protruding portion is formed by performing a second process by shaving. Is obtained.

Further, according to the present invention, in any one of the methods for manufacturing a superelastic element, the method for manufacturing a superelastic element is characterized in that the first processing or the second processing is performed after the softening treatment. Is obtained. This softening treatment is performed so that cracks do not occur during upsetting.
The softening annealing is preferably performed in the temperature range of 00 ° C to 1000 ° C, more preferably 700 to 900 ° C.

Further, according to the present invention, in any one of the methods for manufacturing a superelastic element, after the first or second processing, a part of the protruding portion is ground, A device manufacturing method is obtained.

Further, according to the present invention, in any one of the methods for manufacturing a superelastic element described above, at the time of the first processing,
A method for manufacturing a superelastic element is provided, in which a mold for defining a processed shape of the protruding portion is provided in the processed portion of the superelastic alloy, and the first processing is performed.

Further, according to the present invention, in any one of the above methods for manufacturing a superelastic element, the method for manufacturing a superelastic element is characterized in that the superelastic element has shape memory characteristics.

According to the present invention, in the method for manufacturing the superelastic element, the superelastic alloy is 50 to 51 at.
% Ni and the balance Ti, or 49.5 at-51% Ni,
A superelastic element manufacturing method is obtained which is characterized by comprising 0.1 to 2 at% X (where X is at least one of Cr, V, and Co) and the balance Ti.

Further, according to the present invention, in any one of the methods for manufacturing a superelastic element, the superelastic element is:
A superelastic element manufacturing method characterized by having at least superelastic characteristics between 40 and 80 ° C. is obtained.

[0027]

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 are views showing a method of manufacturing a superelastic element according to an embodiment of the present invention.

Ti-5 obtained by high frequency vacuum melting
A 0.5 at% Ni alloy was formed into a wire having a diameter of 8 mm by a hot hammer and a hot roll. This wire rod is repeatedly cold-drawn and heat-treated to obtain a wire rod with a diameter of 1.0 mm, and then cold working (working rate 36%) to a diameter of 0.8 mm without heat treatment, and further at a temperature of 500 ° C. Heat treatment was performed for 5 minutes to obtain a super elastic wire. This was press cut into a length of 100 mm to obtain a wire rod. As shown in FIG. 1, this wire rod was subjected to a softening treatment for 1 minute at a temperature of 800 ° C. at an end portion 2 up to 2.5 mm to obtain an antenna element wire 1. Next, the end part 2 is subjected to a single step, and the heading upsetting process is performed.
As shown in (a) and (b), an antenna element having a head 4 at one end of the wire 3 was obtained.

Table 1 below shows the workability in the heading process and the presence or absence of cracks depending on the presence or absence of annealing.
Here, in Table 1 below, x indicates that there are cracks, Δ indicates that there are some cracks, and ◯ indicates that there are no cracks and that they are good.

[0031]

[Table 1]

In Table 1 above, in the case of no annealing, cracking occurs when the working rate exceeds 20%, but in the case of annealing, cracking is observed even at the working rate of 60%. Absent.

3 to 6 show various modifications of the head of the antenna element.
It can be performed according to various uses.

In the side view and front view of FIGS. 3A and 3B, the head 5 has a rectangular plate shape. Also,
In the side view and front view of FIGS. 4 (a) and (b),
The head 6 has an elliptical plate shape. Also, FIGS. 5 (a) and 5 (b)
In the side view and front view of FIG. 1, the head 7 has a semi-ellipsoidal shape. In the side view and front view of FIGS. 6A and 6B, a disk including an elliptical plate is cut out on both sides.

[0035]

As described above, according to the present invention, it is possible to provide a superelastic element having the advantages that the number of parts can be omitted and that it is hard to break and a manufacturing method thereof. .

Further, according to the present invention, it is possible to provide a superelastic element having a small number of manufacturing steps, easy to manufacture, and low in manufacturing cost, and a manufacturing method thereof.

[Brief description of drawings]

FIG. 1 is a diagram which is used for explaining a method of manufacturing a superelastic element according to an embodiment of the present invention.

FIG. 2 is a diagram which is used for explaining a method of manufacturing a superelastic element according to an embodiment of the present invention, in which (a) is a side view,
(B) has shown the front view, respectively.

3A and 3B are diagrams showing a modification of the head portion of the antenna element according to the embodiment of the present invention, in which FIG. 3A is a side view and FIG. 3B is a front view.

FIG. 4 is a diagram showing a second modified example of the head of the antenna element according to the embodiment of the present invention, in which (a) is a side view,
(B) is a front view.

FIG. 5 is a diagram showing a third modification of the head of the antenna element according to the embodiment of the present invention, (a) being a side view,
(B) is a front view.

FIG. 6 is a diagram showing a fourth modification of the head of the antenna element according to the embodiment of the present invention, (a) is a side view,
(B) is a front view.

FIG. 7 is a vertical cross-sectional view of a conventional antenna.

8 is a diagram showing the antenna element of FIG. 7. FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Antenna material 2 End part 3 Wire material 4, 5, 6, 7, 8 Head 50 Antenna 51 Antenna element 52 Super elastic wire 53 Ring 54 One end 55 Protrusion 60 Top part

Claims (16)

[Claims] 1. A substantially elastic superelastic alloy,
The superelastic alloy is characterized in that a part or an end portion in a length direction is provided with a protruding portion that protrudes substantially in a radial direction of the superelastic alloy. 2. The superelastic element according to claim 1, wherein the protrusion has a polygonal cross section, an ellipse including a circle, or a combination of these elements. 3. The superelastic element according to claim 1 or 2, which has at least superelastic characteristics within a temperature range of -40 to 80 ° C. 4. The superelastic element according to claim 1, wherein the superelastic alloy has shape memory characteristics. 5. The superelastic element according to claim 4, wherein the superelastic alloy comprises 50 to 51 at% Ni and the balance Ti,
Or 49.5 to 51 at% Ni, 0.1 to 2 at% X
(However, X is at least one of Cr, V, and Co) and the balance Ti. 6. An antenna element using the superelastic element according to any one of claims 1 to 5. 7. A spectacle frame using the superelastic element according to claim 1. Description: 8. A core material comprising the superelastic element according to any one of claims 1 to 5. 9. A substantially long-length superelastic alloy,
The superelastic alloy is a method for producing a superelastic element having a protrusion projecting substantially in the radial direction of the superelastic alloy from a part or an end in the lengthwise direction, wherein the protrusion is A method for manufacturing a superelastic element, characterized in that the superelastic element is formed by performing at least one step of upsetting. 10. A superelastic alloy having a substantially elongated shape, wherein the superelastic alloy has a protruding portion that protrudes substantially in the radial direction of the superelastic alloy from a part or an end portion in the length direction. A method for manufacturing a superelastic element comprising:
A method of manufacturing a superelastic element, characterized in that the superelastic element is formed by performing a second processing by shaving. 11. The method of manufacturing a superelastic element according to claim 9 or 10, wherein the first processing or the second processing is performed after the softening treatment. 12. The method of manufacturing a superelastic element according to claim 9, wherein the first or second superelastic element is manufactured.
A method of manufacturing a superelastic element, characterized in that a part of the protruding portion is ground after the processing of. 13. The method of manufacturing a superelastic element according to claim 9, wherein the processed portion of the superelastic alloy has a processed shape of the protrusion during the first processing. A method of manufacturing a superelastic element, characterized in that a mold for defining the above is provided and the first processing is performed. 14. The method of manufacturing a superelastic element according to claim 9, wherein the superelastic element has shape memory characteristics. 15. The method for manufacturing a superelastic element according to claim 14, wherein the superelastic alloy is 50 to 51 at% Ni.
And the balance Ti, or 49.5 at-51% Ni, 0.1
2 at% X (where X is at least one of Cr, V, and Co) and the balance Ti, and a method for manufacturing a superelastic element. 16. The method of manufacturing a superelastic element according to claim 14 or 15, wherein the superelastic element is -40 to 80.
A method for manufacturing a superelastic element, which has at least superelastic characteristics at a temperature between 0 ° C.