JP2009086580A - Spectacle frame using nickel-titanium alloy material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spectacle frame using a nickel-titanium alloy material at least in part which is easy to fit to a user's face shape and is durable, fashionable and light. <P>SOLUTION: In the spectacle frame using a nickel-titanium alloy material at least in part, a fitting part is made of a pure titanium material jointed to a nickel-titanium alloy material, and the joint part has a larger tensile strength than the pure titanium material. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

      The present invention relates to a spectacle frame using a nickel-titanium alloy material at least partially.

      The spectacle frame is required to have functions such as being easy to be deformed and adjusted in accordance with the face shape of the user, being strong and fashionable, and being lightweight. Therefore, it is desired that the spectacle frame is made of a material that is easily deformed so that it can be easily deformed and adjusted in accordance with the face shape of the user at the time of sale. On the other hand, it is also desired to be made of a material that is not easily deformed so that the shape does not easily collapse during use.

      Nickel-titanium alloy material is unsuitable for spectacle frames because it is difficult to adjust the deformation to match the user's face shape at the time of sale, but it is suitable for spectacle frames because it is difficult to collapse during use. . Therefore, in a spectacle frame using a nickel / titanium alloy material at least in part, the deformation adjustment part may be easily deformed by a method in which the nickel / titanium alloy material does not partially exhibit superelasticity.

      This general method is a method of partially annealing a shape memory treated material. In addition, “parts having superelasticity partially and manufacturing method thereof” in Patent Document 1 propose a method of using a material that exhibits superelasticity only in the final cold-worked portion. However, these methods are difficult to deform compared to other metal materials used for spectacles even when the nickel-titanium alloy material does not exhibit superelasticity, and therefore it is not suitable for the user's face shape. There is a problem that it is difficult to produce a spectacle frame that can be easily deformed and adjusted.

      In addition, a spectacle frame using nickel / titanium alloy material at least partially may make it easy to deform the deformation adjusting portion by joining the nickel / titanium alloy material and another metal material used for spectacles. .

      For example, “a spectacle frame made of a superelastic alloy that can be easily adjusted” in Patent Document 2 proposes a method of inserting an adjustment pipe into the superelastic alloy. However, this method has a problem that it is difficult to produce a strong and fashionable spectacle frame because the bonding strength between the superelastic alloy and the adjusting pipe is weak.

      In addition, "Junction of Ni-Ti alloy and dissimilar metal and its joining method" in Patent Document 3 proposes a method of directly joining nickel-titanium alloy material and other metal materials used for glasses. Yes. However, in this method, when a nickel-titanium alloy material and a Ni-Cr alloy material, which is a material with a higher specific gravity, are joined, the tensile strength of the joint is high, so a durable and fashionable eyeglass frame is produced. Although it was possible, there was a problem that the produced spectacle frame became heavy. In addition, when a nickel / titanium alloy material and a titanium material, which is lighter in specific gravity, are joined together, a light eyeglass frame can be produced, but it is durable because the tensile strength of the joint is lower than the tensile strength of the titanium material before joining. Therefore, there was a problem that it was difficult to produce a spectacle frame excellent in fashionability.

As described above, in the conventional method for joining the nickel / titanium alloy material and the dissimilar metal material, at least a part of the spectacle frame using the nickel / titanium alloy material is deformed and adjusted according to the face shape of the user. However, it was not possible to satisfy all the conditions for producing a spectacle frame that is easy to use, strong, fashionable, and lightweight.
Japanese Patent No. 3915543 Japanese Examined Patent Publication No. 7-56537 Japanese Patent No. 2737817

      The present invention has been made under such circumstances, and in a spectacle frame using a nickel-titanium alloy material at least in part, it is easy to deform and adjust to a user's face shape. The object of the present invention is to provide a spectacle frame that is strong, fashionable and lightweight.

      The invention according to claim 1 of the present invention uses a pure titanium material joined to a nickel / titanium alloy material at a deformation adjustment site in a spectacle frame using a nickel / titanium alloy material at least in part. The eyeglass frame is characterized in that the tensile strength of the joint portion is equal to or higher than that of a pure titanium material.

      The invention according to claim 2 of the present invention is the eyeglass frame according to claim 1, wherein the nickel-titanium alloy material is a material that exhibits a superelastic effect.

      According to a third aspect of the present invention, in the eyeglass frame according to the first or second aspect, the part is a temple ear-hanging portion.

      According to a fourth aspect of the present invention, the spectacle frame according to any one of the first to third aspects is characterized in that the part is an assembly part with the front of the temple.

      According to a fifth aspect of the present invention, in the eyeglass frame according to any one of the first to fourth aspects, the part is a pad foot portion of a pad.

      According to a sixth aspect of the present invention, the pure titanium material is a material corresponding to one or two types defined in JIS H4650, according to any one of the first to fifth aspects. It is a spectacle frame.

      A seventh aspect of the present invention is the eyeglass frame according to any one of the first to sixth aspects, wherein the joining portion is formed by grinding after joining.

      The invention according to an eighth aspect of the present invention is the spectacle frame according to any one of the first to seventh aspects, wherein the joining portion is formed by cutting after joining.

      According to a ninth aspect of the present invention, in the eyeglass frame according to any one of the first to eighth aspects, the joint portion is formed by plastic working after the joint.

      The joint between the nickel / titanium alloy material of the present invention and the pure titanium material is produced by friction welding by a method developed by the present inventors, and has a tensile strength equal to or higher than that of the pure titanium material before joining. It is what you have.

      According to the present invention, a spectacle frame using a nickel / titanium alloy material can be provided which is strong and easy to adjust for deformation and has a good appearance and comfort.

      That is, the spectacle frame of the present invention uses a pure titanium material joined to a nickel-titanium alloy material at a site where deformation is adjusted in accordance with the shape of the user's face or head, and the tensile strength of the joined part is a pure titanium material. As described above, deformation adjustment can be easily performed as in the case of a conventional pure titanium material. In addition, deformation adjustment is often performed by bending a member. However, the spectacle frame of the present invention has a tensile strength that greatly affects the bending strength and is higher than that of pure titanium material at the joint portion. Adjustment can be performed easily.

      In addition, the conventional method for joining nickel-titanium alloy materials and dissimilar metal materials reduces the strength of the joint part, so even if pure titanium material is used for the deformation adjustment part, there is a risk of easy damage at the joint part. However, by using the method developed by the present inventors, it became possible to join a pure titanium material with sufficient strength. Therefore, even in a spectacle frame using a nickel-titanium alloy material that is difficult to deform with high strength, it is possible to use pure titanium material for the deformation adjustment part, and to realize a spectacle frame that is durable and easy to adjust for deformation. it can.

      The joint part of the dissimilar metal joint of nickel / titanium alloy material and pure titanium material obtained by the method developed by the present inventors is due to the compressive force due to the upset force and the rotational force of the rotational motion that decelerates in the state of friction welding. It consists of the structure | tissue of the formed reaction layer, and has the tensile strength of the pure titanium material before joining.

      In the dissimilar metal joint of nickel-titanium alloy material and pure titanium material obtained by the method developed by the present inventors, the weld surface is directly heated and the upset force is increased at the pressure temperature. In order to receive, the heat affected zone is small. In addition, the reaction layer formed by the structure of the reaction layer formed by the compressive force due to the upset force and the rotational force of the decelerating rotational motion is deformed into a thin plate shape, and the reaction layer separated by the deformation is bonded to the joint surface. Since it is discharged to the outside, the joint portion has a tensile strength equal to or higher than the tensile strength of the pure titanium material before joining, and the strength variation of the joint portion is small.

      In addition, as is clear from the fact that such strength characteristics are obtained, the joint portion of the dissimilar metal joint of nickel / titanium alloy material and pure titanium material obtained by the method developed by the present inventors has a rotational motion. From a reaction layer structure different from the structure of the reaction layer obtained by a general friction welding method in which a simple compression force by an upset force is applied in a state where the pressure is completely stopped, or by another pressure welding method in which a simple compression force by pressure is applied Become.

      The method of joining the dissimilar metal joints of nickel / titanium alloy material and pure titanium material developed by the present inventors is to frictionally weld at least one of the joint surfaces of nickel / titanium alloy material and pure titanium material while rotating. After the start of the deceleration of the rotational motion, compression is performed by applying a predetermined upset force while the peripheral speed at the outermost periphery of the rotational motion is 1 m / second or more.

      Further, in addition to these, the friction welding conditions may be characterized in that the peripheral speed at the outermost periphery of the rotational motion is 4 m / second or more, the friction pressure is 55 MPa or less, and the friction time is 0.5 seconds or more. is there.

      In the joining method of dissimilar metal joints of nickel-titanium alloy material and pure titanium material developed by the present inventors, the joining portion is formed of a reaction layer formed by a compressive force due to an upset force and a rotational force of a rotational motion that decelerates. The conditions for applying the upset force are regulated so as to have a tensile strength equal to or higher than the tensile strength of the pure titanium material before joining. Furthermore, the conditions of the friction welding relating to the peripheral speed, friction pressure, and friction time at the outermost periphery of the rotational motion are regulated so that the temperature distribution on the joint surface does not become extremely uneven.

      In the joining method of the dissimilar metal joints of nickel / titanium alloy material and pure titanium material developed by the present inventors, the nickel / titanium alloy material and pure titanium material have a frictional margin in friction welding. Since the thickness is about 0.1 to 0.5 mm, it is preferable to perform a lathe process on the joint surface before friction welding in order to prevent the contact state from becoming extremely uneven.

      Also, the upset force during friction welding should be a large force that does not exceed the yield strength of the pure titanium material before joining in order to prevent the pure titanium material from changing its shape except at the friction welding part. preferable.

      In addition, burrs generated by friction welding are locations where stress is concentrated in the shape, and reaction layers separated by deformation are likely to remain without being discharged out of the joint surface, which is likely to include defects. It is preferable to remove by a technique such as grinding or cutting.

      By the way, since the strength of the joint portion is low in the conventional joining method, the spectacle frame is generally manufactured by a method of joining after molding. However, the eyeglass frame of the present invention can be formed by grinding, cutting, or plastic working after joining the joint because the joint has high strength in the method developed by the present inventors. Therefore, according to the shape of the final product, the spectacle frame of the present invention can be selected to be manufactured by a method of forming and joining, or by a method of forming after joining.

      Hereinafter, a specific configuration of the present invention will be described based on examples.

      Using a nickel-titanium alloy material round bar that is a material that exhibits the effect of superelasticity and a pure titanium material round bar that is equivalent to the two types specified in JIS H4650, A friction welding test of pure titanium material was performed. The test piece was 4 mm in diameter and 63 mm in length, and the joining surface before friction welding was subjected to lathe processing. The nickel / titanium alloy material before bonding was a centerless polished material that was annealed. Moreover, the pure titanium material before joining was a material which was centerless polished, and had a yield strength of about 240 MPa and a tensile strength of about 450 MPa.

      The friction welding conditions were as follows: the peripheral speed at the outermost circumference of the rotary motion was 4.16 m / sec, the friction pressure was 46 MPa, the friction time was 1 sec, the upset pressure was 239 MPa, and the upset timing of the example was 0.00 sec. .06 seconds, 0.12 seconds, and the comparative example upset timing were 0.18 seconds, 0.24 seconds, and 0.27 seconds. Here, the upset timing refers to the time from the start of the deceleration of the rotational motion until the upset force is applied. The relationship between the upset timing and the peripheral speed at the outermost circumference of the rotational motion is 4.16 m / sec at 0.00 seconds, 2.99 m / sec at 0.06 seconds, 1.74 m / sec at 0.12 seconds, The velocity was 0.77 m / sec at 0.18 sec, 0.14 m / sec at 0.24 sec, and 0.00 m / sec at 0.27 sec.

      The test piece subjected to friction welding was subjected to a tensile test after removing burrs by grinding and setting the interval between the grips with the joint portion disposed in the center to 40 mm and the crosshead speed to 0.01 mm / second. Table 1 shows the results of the total upset amount and tensile strength of each friction welded test piece. Note that the total upset amount is the sum of the frictional margin amount and the upset margin amount.

      As is clear from Table 1, in the embodiment of the method developed by the present inventors, the bonded portion has a tensile strength equal to or higher than the tensile strength of pure titanium material before bonding, and the heat-affected zone after bonding is small. Furthermore, it was confirmed that the variation in the strength of the joint portion was small. In addition, in the comparative example in which the upset force is applied at the time when the peripheral speed at the outermost periphery of the rotational motion becomes 1 m / second or less after the start of the deceleration of the rotational motion, the joint portion is higher than the tensile strength of the pure titanium material before joining. It was confirmed that the tensile strength was not able to be achieved and the strength variation of the joint portion was large.

      An example of the spectacle frame of the present invention includes an spectacle component called a temple shown in FIG. The spectacle frame is not easily deformed because the spring portion 1 of the temple is made of a nickel / titanium alloy material. Further, the contact state of the spectacle frame with the ear is often adjusted by deforming the temple ear hook 2. Further, the opening angle of the temple of the eyeglass frame is often adjusted by changing the front wisdom according to the face type of the user, but it should be adjusted by changing the assembly part 3 with the temple front. You can also. Therefore, in the temple of this embodiment, the spring part 1 made of nickel / titanium alloy material and the ear hook part 2 made of pure titanium material are joined at the joint part J1, and the spring part 1 made of nickel / titanium alloy material. And a front part made of a pure titanium material are eyeglass parts joined at a joint part J2. In addition, the junction part J1 and the junction part J2 should just be arbitrary places in a temple. Further, the cross-sectional shape of the spectacle component may be any shape. Furthermore, the ear hook 2 may be covered with a resin material.

      In the eyeglass frame of the present invention, the spring part 1 made of nickel / titanium alloy material and the ear hook part 2 made of pure titanium material are joined at the joint part J1, or the spring part made of nickel / titanium alloy material. This includes an example in which an assembly portion 3 of 1 and a front made of a pure titanium material is composed of a temple joined at a joint portion J2.

      An example of the spectacle frame of the present invention includes an spectacle component called a pad shown in FIG. The spectacle frame is not easily deformed because the pad foot 4 of the pad is made of a nickel / titanium alloy material. Further, the contact state of the spectacle frame with the nose is often adjusted by deforming the pad foot portion 4 of the pad. Therefore, the pad of this embodiment is a spectacle component in which a part of the pad foot part 4 made of nickel / titanium alloy material and a part of the pad foot part 4 made of pure titanium material on the pad box part 5 side are joined at the joint part J3. It is. In addition, the junction part J3 should just be an arbitrary location in a pad leg. Further, the cross-sectional shape of the spectacle component may be any shape.

      Further, the spectacle frame of the present invention is a spectacle component in which a part of the pad foot part 4 side of the pad foot part 4 made of nickel / titanium alloy material and a part of the pad foot part 4 made of pure titanium material are joined at the joint part J3. The example comprised from is also included.

      As shown in FIG. 3, the spectacle frame of the present invention includes an example in which spectacle parts called a bridge and a pad are integrated. The spectacle frame is not easily deformed because the bridge portion 6 of the bridge and the pad foot portion 4 of the pad are made of a nickel / titanium alloy material. Further, the contact state of the spectacle frame with the nose is often adjusted by deforming the pad foot portion 4 of the pad according to the face shape of the user. Therefore, in the eyeglass component pad and bridge integrated in this embodiment, the bridge portion 6 made of nickel / titanium alloy material and the pad foot portion 4 made of pure titanium material are joined at the joint portion J4 and the joint portion J5. Eyeglass parts. In addition, the junction part J4 and the junction part J5 should just be arbitrary places in a pad foot | leg part or a bridge | bridging part. Further, the cross-sectional shape of the spectacle component may be any shape.

      Further, the spectacle frame of the present invention includes an example in which a spectacle component called a brace bar and a pad are integrated.

      The present invention can be used as a spectacle frame using a nickel-titanium alloy material at least partially.

In Example 2, it is a perspective view of a temple. In Example 3, it is a perspective view of a pad. In Example 4, it is a perspective view of what integrated the bridge | bridging and the pad.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Spring part 2 Ear hook part 3 Assembly part with the front 4 Pad foot part 5 Pad box part 6 Bridge part J Joint part

Claims (9)

        In eyeglass frames that use nickel / titanium alloy material at least in part, pure titanium material bonded to nickel / titanium alloy material is used at the deformation adjustment site, and the tensile strength of the bonded portion is equal to or higher than that of pure titanium material. An eyeglass frame characterized by         The eyeglass frame according to claim 1, wherein the nickel-titanium alloy material is a material that exhibits a superelastic effect.         The spectacle frame according to claim 1 or 2, wherein the part is an ear hooking portion of a temple.         The spectacle frame according to any one of claims 1 to 3, wherein the part is an assembly part with the front of the temple.         The spectacle frame according to any one of claims 1 to 4, wherein the part is a pad foot part of a pad.         The spectacle frame according to any one of claims 1 to 5, wherein the pure titanium material is a material corresponding to one or two types defined in JIS H4650.         The spectacle frame according to any one of claims 1 to 6, wherein the joining portion is formed by grinding after joining.         The spectacle frame according to claim 1, wherein the joining portion is formed by cutting after joining. The spectacle frame according to any one of claims 1 to 8, wherein the joining portion is formed by plastic working after joining.