JP2002205164A - Shape memory superelastic article and method of manufacturing it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase brazing strength between a shape memory superelastic member (e.g. temple of glasses) and a metal piece to be attached thereto (e.g. hinge), and to prevent reaction between the member and a metallic base layer, for example. SOLUTION: A four-layered structure 5, for which an insulative layer 2 (Nb), a metallic base layer 3 (Ti, Au, Ni, Pt, Pd) for brazing, and a die protective layer 4 (Ni-Cu) are laminated on an Ni-Ti based shape memory superelastic base material 1, is press-formed and shape-memory processed to form a temple 9; then, the metallic base layer 3 is exposed by removing the die protective layer 4; and the metallic base layer 3 and a hinge piece 10 are brazed with a filler metal 8. The insulative layer 2 prevents reaction between the shape memory superelastic base material 1 and the metallic base layer 3, while the die protective layer 4 prevents the four-layered structure 5 from burning in a metallic die. The article is also applied to orthodotic wires, implantation, medical catheters, stents, women's underwear, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shape memory / superelastic article and a method of manufacturing the same, and more particularly to, for example, Ni-T.
The present invention relates to a shape memory / superelastic article made of an i-type shape memory / superelastic alloy (e.g., a vine for glasses) and a metal, and a method of manufacturing the same.

[0002]

2. Description of the Related Art In recent years, a shape made of a shape memory / superelastic alloy having characteristics of a shape memory effect and a superelastic effect (for example, Ni-Ti alloy, Ni-Ti-Co alloy, Ni-Ti-Cu alloy, etc.). Commodities in the form of a memory / superelastic member and a metal or alloy joined together include, for example, eyeglass frames, orthodontic wires, implants, medical catheters, stents,
It is offered in various fields such as women's underwear (bras).

[0003] In the present specification, "metal" is used as a general term for a metal or alloy to be joined to a shape memory / superelastic member. Also, for example, a wire made of a shape memory / superelastic alloy material before commercialization is described as “shape memory / superelastic material”, and the shape memory / superelastic material is subjected to any processing to obtain a product shape. This is referred to as “shape memory / superelastic member”.

Conventionally, even if a shape memory / superelastic member and a metal are joined by various brazing (aluminum alloy brazing, phosphor copper brazing, silver brazing, gold brazing, etc.), they easily fall off when a strong external force is applied. It often happens.

Therefore, when joining the shape memory / superelastic member and the metal, a manufacturing method is used in which a portion to be joined is put in a metal sleeve and then the metal sleeve is caulked.

FIG. 5 and FIG. 6 are explanatory views of a conventional eyeglass frame (shape memory / superelastic article) using a shape memory / superelastic member for parts such as a crane, a reinforcing arm, and a pad wire. Is a shape memory / superelastic material, 21 is a vine,
22 is a metal sleeve, 23 and 24 are hinge pieces, 25
Is a screw, 26 is a rim, 27 is an L-shaped temple, 28
Represents an upper projecting portion, 29 represents a lower projecting portion, 30 represents a screw, 31 represents a bridge, 32 represents a reinforcing arm, 33 represents a nose pad, 34 represents a nose pad holding portion, and 35 represents a pad wire.

[0008] In the spectacle frame of FIG.
The reinforcing arm 32, the pad wire 35, etc. are made of a shape memory / superelastic alloy, and the hinge pieces 23, the rims 26, etc. are made of metal. -Reinforcing arm 32 and rim 26-Pad wire 35 and rim 26 are each caulked.

In some cases, the rim 26 is made of a shape memory / superelastic alloy, and the bridge 31, the reinforcing arm 32, the pad wire 35 and the like are made of metal.

After the caulking operation, the hinge piece 23 of the vine 21
Is fixed with the hinge piece 24 of the temple 27 and the screw 25,
The upper projection 28 and the lower projection 29 of the rim 26 are fixed with screws 30 with a lens (not shown) inserted therein. The end of the pad wire 35 on the nose pad side is screwed to the nose pad holding portion 34.

FIG. 6 is an explanatory view showing a procedure for producing a crane with a hinge piece, and the contents are as follows. (S21) The shape memory / superelastic material 20 is heat-processed to have the shape of the vine 21. (S22) The end of the crane 21 and the hinge piece 23 are put into the metal sleeve 22. (S23) The metal sleeve 22 is swaged and the hinge piece 23
Is attached to the vine 21.

FIG. 7A is an explanatory diagram showing the stress-strain characteristics of the shape memory alloy.
This indicates that when the alloy or the like is deformed by receiving an external force below the shape recovery temperature and is heated above the shape recovery temperature, the shape of the shape memory alloy returns to its original shape.

[0013] This is because the crystal structure of a shape memory alloy such as a Ni-Ti alloy is firstly transformed from an austenite phase to a martensite phase when the temperature falls below the shape recovery temperature. This is because when a martensite phase is formed and this is heated, it returns to the austenite phase. The martensitic phase shape memory alloy is easily deformed by an external force.

FIG. 7B is an explanatory diagram showing the stress-strain characteristics of the superelastic alloy. When the alloy is deformed by applying an external force in an environment higher than the shape recovery temperature, the original shape is removed. To return to.

[0015] This is because a superelastic alloy such as a Ni-Ti alloy is transformed into a stress-induced martensite phase when subjected to an external force in an austenite phase region at a temperature higher than the shape recovery temperature. This is because the phase returns to the austenite phase.

[0016]

As described above, in the conventional method of connecting the shape memory / superelastic member and the metal by the caulking operation using the metal sleeve, the productivity is remarkably reduced, and each connection is reduced. Since the metal sleeve appears on the appearance of the part, there is a problem that the design is restricted and the appearance is impaired.

Furthermore, there is a possibility that the connection portion may easily come off depending on the degree of caulking with respect to the metal sleeve,
Further, when a product made of a shape memory / superelastic alloy containing nickel or the like is attached to the body with the shape memory / superelastic alloy portion exposed, there is a problem that allergy to the human body may occur. .

Therefore, in the present invention, when the shape memory / superelastic member and the metal are connected by brazing, a brazing metal base layer (for example, Ti or Ni) to form a more complete brazing strength between the shape memory / superelastic member such as a crane of spectacles and a hinge piece attached thereto, and to make the attached portion look good. With the goal.

Another object is to form an insulating layer between the shape memory / superelastic member and the metal base layer to prevent a reaction between the shape memory / superelastic member and the metal base layer.

When forming a shape memory / superelastic material from a shape memory / superelastic material by die processing such as press molding, a mold protection layer is previously formed on the shape memory / superelastic material, and The purpose of the present invention is to prevent the shape memory / superelastic member from being seized in the mold.

[0021]

Means for Solving the Problems In order to achieve this,
In the present invention, a shape memory / superelastic article having the following configuration is used. In a shape memory / superelastic article in which a shape memory / superelastic member and a metal are brazed, a metal base layer for brazing is formed on at least a part to be brazed of the shape memory / superelastic member. Characteristic shape memory / superelastic article An insulating layer for preventing a reaction between the shape memory / superelastic member and the metal base layer is formed below the metal base layer. Shape memory / super-elastic article according to or characterized in that a base layer made of titanium or gold is used as the metal base layer.

Further, a method for manufacturing a shape memory / superelastic article having the following constitution is used. In a method of manufacturing a shape memory / superelastic article in which a shape memory / superelastic member and a metal are integrated by brazing, a metal base layer for brazing is formed on at least a brazing target portion of the shape memory / superelastic member. And brazing the metal base layer and the metal, wherein the shape memory / superelastic member is provided on at least a brazing target portion of the shape memory / superelastic member. Forming an insulating layer for preventing a reaction between the metal base layer and the metal base layer, wherein a titanium or gold base layer is used as the metal base layer. The method for manufacturing a shape memory / superelastic article according to or described above, wherein the shape memory / superelastic member is formed from a shape memory / superelastic material by die processing. Serial shape memory / to form a pre-mold protection layer superelastic material, manufacturing method of a shape memory / superelastic articles which to described, characterized in that

As described above, the shape memory / superelastic article and the method of manufacturing the same have the following advantages: (i) the bonding strength between the shape memory / superelastic member and the metal brazed thereto is more sufficient; / The design of the super-elastic member and the attachment portion of the metal is good, and the shape memory / prevents chemical diffusion between the super-elastic member and the metal.

Further, when the mold protection layer is formed, the shape memory / superelastic member after molding is also seized to the mold by heat treatment during mold molding (press molding) of the shape memory / superelastic material. Therefore, the shape memory / superelastic member can be easily detached from the mold.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 and 2 are explanatory views showing a shape memory / superelastic article obtained by brazing a shape memory / superelastic member and a metal part, and a preparation procedure thereof, and FIG. 3 is a shape memory / superelastic alloy, an insulating layer, and a metal. FIG. 4 is an explanatory diagram showing an example of a combination of a base layer and a mold protection layer. FIG. 4 is an explanatory diagram showing a procedure for brazing a shape memory / superelastic member and a metal hinge piece. FIG. 1 shows a cross-sectional state of each component.

1 to 4, reference numeral 1 denotes a shape memory of a filament made of a nickel-titanium alloy before press molding / superelastic material, and 1 'denotes a shape memory of a wire made of a nickel-titanium alloy after press molding / A superelastic member, 2 is an insulating layer made of niobium, 3 is a metal base layer made of titanium, 4 is a mold protection layer made of a nickel-copper alloy, and 5 is a shape memory / superelastic material 1 having 2 to 4 layers. The linear four-layer structure before press forming is provided, 6 is a plate-shaped three-layer structure obtained by removing the mold protection layer from the four-layer structure after press forming, and 7 is the shape memory / superelastic member 1 '. A metal part to be attached to a metal, 8 is a brazing material made of nickel, titanium, and copper, 9 is a vine having a four-layer structure after press molding and shape memory processing, and 9 'is an outermost layer of the four-layer structure. After removing a certain mold protective layer 4, the three-layered vine, 10 Genus steel hinge piece (metal part) shows, respectively.

In FIG. 1, (a) shows an insulating layer 2 and a metal base layer 3 on the outer peripheral surface of a filament shape memory / superelastic material 1.
And a four-layer structure 5 before press forming in which a mold protection layer 4 is sequentially attached, and (b) shows a work shape of the four-layer structure 5 by work hardening by press forming using a mold, The three-layer structure 6 (shape memory / superelastic member 1 ′ and insulating layer 2, metal base layer 3) after removing the product shape body from the mold and removing the mold protection layer 4 is shown, and FIG. Shows a state in which the three-layer structure 6 and the metal component 7 are joined by using the brazing material 8.

FIG. 2 is an explanatory view showing a procedure for preparing the shape memory / superelastic article of FIG. 1, and the contents are as follows. (S1) A four-layer structure 5 is formed by sequentially laminating an insulating layer 2, a metal base layer 3, and a mold protection layer 4 on the outer peripheral surface of the shape memory / superelastic material 1. (S2) The four-layer structure 5 is subjected to press molding and shape memory processing to form a product shape body comprising the shape memory / superelastic member 1 'and the outer two to four layers. (S3) The product shape is taken out of the mold. (S4) The three-layer structure 6 in which the metal base layer 3 is exposed by washing and removing the mold protection layer 4 of the product shape body with acid.
Create (S5) The three-layer structure 6 and the metal component 7 are brazed with the brazing material 8.

Here, means for laminating the insulating layer 2, the metal base layer 3, and the mold protection layer 4 on the outer peripheral surface of the shape memory / superelastic material 1 are as follows. A processing method in which a foil (paper-like metal piece) is sequentially wound around the shape memory / superelastic material 1. A tube is formed by sequentially stacking foils made of materials of 2 to 4 layers, and a shape memory / superelastic is formed on the tube. A processing method in which a tube is crimped to the outer peripheral surface of the shape memory / superelastic material 1 with the material 1 inserted.-Explosive cladding method-The material (thin plate) of each of 2 to 4 layers is exploded by shape memory / super A processing method for covering or adhering to the elastic material 1 · HIP (High Press) method · Extrusion method-shape memory / superelastic materials 1 and 2 to 4 are put into a mold and extruded from holes to adhere. Use a processing method or the like.

By providing the insulating layer 2 on the outer peripheral surface of the shape memory / superelastic material 1 made of a nickel-titanium alloy, the distance between Ni—Ti of the shape memory / superelastic material 1 and Ti of the metal base layer 3 is increased. Prevents the chemical diffusion from occurring.

That is, Ni of the shape memory / superelastic material 1
When Ti is directly joined to Ti of the metal base layer 3,
Since the nickel atoms of the shape memory / superelastic material 1 may dissolve into the titanium of the metal base layer 3 and the entire metal base layer 3 becomes a nickel-titanium alloy, this chemical diffusion does not occur in the insulating layer 2. Like that.

The insulating layer 2 also has a function of preventing a change in the characteristics of the shape memory / superelastic material by suppressing a change in the amount of Ni in the shape memory / superelastic material 1 made of a Ni—Ti alloy.

The mold protection layer 4 is formed by subjecting the four-layer structure 5 to heat processing (press molding) in a mold to obtain a shape memory / superelastic member 1 '.
This is to prevent the product shape from sticking to the inside of the mold when the product shape made of such as is formed. By the formation of the mold protection layer 4, the product shape after press molding is reduced. It can be easily removed from the mold. Whether or not to remove the mold protection layer 4 after press molding is optional.

As shown in FIG. 3, as a shape memory / superelastic alloy (shape memory / superelastic material), an insulating layer, a metal base layer and a mold protection layer, for example, (1) shape memory / superelastic alloy ( Shape memory / superelastic material 1): Ni-Ti alloy (for example, Ni-Ti alloy, Ni
-Ti-Co alloy, Ni-Ti-Cu alloy, etc.) (2) Insulating layer 2: Nb (3) Metal base layer 3: Ti, Ni, Au, Pt, Pd (4) Mold protection layer 4: Ni- Cu alloy or the like is used.

Other metals and the like may be used. For example, a Cu—Zn—Al alloy,
Various shape memory / superelastic alloys such as Cu-Al-Ni alloy and Fe-Mn-Si alloy may be used, and noble metals such as Au, Pt, and Pd may be used as the insulating layer 2.

As a material of the insulating layer 2 and the metal base layer 3, A
When a noble metal such as u, Pt, or Pd is used, a decorative effect based on the material itself can be expected.

When a material other than Ni is used as the material of the metal base layer 3, a metal part 7 and a brazing material 8 are added to the shape memory / superelastic member (for example, the three-layer structure 6) after press molding. Ni is not exposed on the surface portion after brazing, and a product suitable for preventing nickel allergy can be provided.

The procedure for brazing the shape memory / superelastic member and the metal hinge piece in FIG. 4 is as follows. (S11) A linear four-layer structure 5 in which an insulating layer 2, a metal base layer 3, and a die protection layer 4 are sequentially laminated on the outer peripheral surface of the shape memory / superelastic material 1 is press-formed with a die, and processed. Cured into a plate. The thickness of each of the layers 2 to 4 is, for example, several microns. (S12) A shape memory / superelastic member vine 9 is formed by performing a shape memory process on the plate at about 450 ° C. (S13) The four-layered vine 9 removed from the mold is subjected to an acid treatment to remove the outermost mold protection layer 4. (S14) A metal hinge piece 10 is brazed with a brazing material 8 to the metal base layer 3 of the vine 9 'having a three-layer structure by removing the mold protection layer 4.

The brazing material 8 is composed of the metal base layer 3 and the hinge pieces 10
And the metal base layer 3 and the hinge piece 10 are firmly fixed to the respective joint surfaces to enable hard soldering.

By the action of the metal base layer and the brazing material, the other combination of the shape memory / superelastic member and the metal part constituting the glasses (the bridge 32, the rim 26, the reinforcing arm 33, Rim 26, pad wire 36 and rim 26), orthodontic wires, implants,
It is also possible to strongly join a combination portion of a shape memory / superelastic member and a metal in various fields such as a medical catheter, a stent, and a brassiere.

As a result of the experiment, it was found that Ti-C
It has been confirmed that the metal base layer 3 and the hinge piece 10 can be brazed with sufficient practical strength when using an aluminum alloy braze, a phosphor copper braze, a silver braze, a gold braze or the like in addition to the u-Ni alloy braze.

When the joining partner of the shape memory / superelastic member is a shape memory / superelastic alloy, an insulating layer 2 and a metal base layer are formed on the joining partner side in the same manner as in FIGS. Then you can braze them together.

As described above, instead of performing the shape memory process after sequentially laminating the insulating layer 2, the metal base layer 3, and the mold protection layer 4 on the outer peripheral surface of the shape memory / superelastic material 1, First, a shape memory / superelastic member which has been subjected to a predetermined shape memory process may be prepared, and then the insulating layer 2 and the metal base layer 3 may be sequentially laminated on the brazing target portion of this member.

[0044]

As described above, according to the present invention, when the shape memory / superelastic member and the metal are connected by brazing, the shape memory /
Since a metal base layer for brazing (for example, Ti or Ni) is formed on at least a part to be brazed of the superelastic member, a shape memory / superelastic member such as a pair of spectacles and a metal such as a hinge piece attached thereto are attached. The brazing strength can be made more complete, and the mounting portion can be made to look good.

Further, since the insulating layer is formed between the shape memory / superelastic member and the metal base layer, the reaction between the shape memory / superelastic member and the metal base layer can be prevented.

When a shape memory / superelastic material is formed from a shape memory / superelastic material by die processing such as press molding, a mold protection layer is previously formed on the shape memory / superelastic material. The shape memory / superelastic member after molding can be prevented from seizing in the mold.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a shape memory / superelastic article obtained by brazing a shape memory / superelastic member and a metal part according to the present invention.

FIG. 2 is an explanatory view showing a procedure for brazing a shape memory / superelastic member and a metal part according to the present invention.

FIG. 3 is an explanatory view showing an example of a combination of a shape memory / superelastic alloy, an insulating layer, a metal base layer, and a mold protection layer according to the present invention.

FIG. 4 is an explanatory view showing a procedure of brazing a shape memory / superelastic member and a metal hinge piece according to the present invention.

FIG. 5 is an explanatory view of a conventional eyeglass frame using a shape memory / superelastic member.

FIG. 6 is an explanatory diagram showing a conventional procedure for assembling a hinge member made of a shape memory / superelastic alloy and a metal hinge piece.

FIG. 7 is an explanatory diagram showing stress-strain characteristics of a general shape memory alloy and stress-strain characteristics of a superelastic alloy.

[Explanation of symbols]

1: Shape memory / superelastic material of filament before press molding 1 ′: Shape memory / superelastic member after press molding 2: Insulating layer 3: Metal base layer 4: Mold protection layer 5: Wire before press molding Striped four-layered structure 6: Plate-shaped three-layered structure from which the mold protective layer has been removed 7: Metal parts 8: Brazing material 9: Four-layered vine after press molding and shape memory processing 9 ': Vine of three-layer structure after removal of mold protection layer 10: metal hinge piece (metal part) 20: shape memory / superelastic material 21: crane 22: metal sleeve 23 and 24: hinge piece 25 : Screw 26: Rim 27: L-shaped temple 28: Upper protruding part 29: Lower protruding part 30: Screw 31: Bridge 32: Reinforcement arm 33: Nose pad 34: Nose pad holding part 35: Pad

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G02C 5/00 G02C 5/00 // A41C 3/14 A41C 3/14 B A61C 7/20 A61C 8/00 Z 8/00 A61M 25/00 304 A61M 25/00 304 C22C 19/03 A C22C 19/03 C22K 1:00 C22K 1:00 A61C 7/00 A

Claims (7)

[Claims] 1. A shape memory / superelastic article in which a shape memory / superelastic member and a metal are brazed, wherein a metal base layer for brazing is formed on at least a part to be brazed of the shape memory / superelastic member. A shape memory / superelastic article. 2. An insulating layer for preventing a reaction between the shape memory / superelastic member and the metal base layer is formed below the metal base layer.
A shape memory / superelastic article as described. 3. The method according to claim 1, wherein a base layer made of titanium or gold is used as said metal base layer.
Or the shape memory / superelastic article according to 2. 4. A method of manufacturing a shape memory / superelastic article in which a shape memory / superelastic member and a metal are integrated by brazing, wherein at least a part to be brazed of the shape memory / superelastic member is used for brazing. A method for manufacturing a shape memory / superelastic article, comprising: forming a metal base layer; and brazing the metal base layer and the metal. 5. An insulating layer for preventing a reaction between the shape memory / superelastic member and the metal base layer is formed on at least a brazing target portion of the shape memory / superelastic member. A method for producing a shape memory / superelastic article according to claim 4. 6. The method according to claim 4, wherein a base layer made of titanium or gold is used as the metal base layer.
Or the method for producing a shape memory / superelastic article according to 5. 7. When forming the shape memory / super-elastic member from the shape memory / super-elastic material by die processing, a mold protection layer is previously formed on the shape memory / super-elastic material. The shape memory according to claims 4 to 6.
A method for manufacturing a superelastic article.