JPH0318991B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for manufacturing a composite material for eyeglass frames, and in particular, to a method for manufacturing a composite material for eyeglass frames, in particular, in a clad material having a core of Ti and an outer covering of Ni or a Ni-based alloy, Ni or alloy elements in the outer covering are diffused into the core material. This improves the overall springiness and strength. As is well known, Ti has properties such as extremely excellent corrosion resistance, light weight, and high strength when alloyed, and for this reason, its application to eyeglass frame materials is being considered. However, since Ti and Ti alloys have a strong affinity for oxygen, it is difficult to braze them due to the oxide film on their surfaces, and therefore it is difficult to apply them as is to eyeglass frames that require parts such as hinges to be brazed. Also, for the same reason, surface plating is difficult, and while Ti has good workability as a pure metal, it does not have sufficient strength or elasticity for eyeglass frames, and on the contrary, it cannot be alloyed.
Although strength and elasticity can be obtained when using a Ti alloy, it is difficult to process, and there is a problem in cases where thinning of the wire is required, such as in eyeglass frames. Therefore, recently, as shown in Japanese Utility Model Application Publication No. 56-50629 and Japanese Patent Application Publication No. 57-5851, pure Ti is used as a core material, and the outside is coated with Ni or Ni, which has good brazing and plating properties. It is being considered to use a Ti-Ni clad material with a cladding made of an alloy for eyeglass frames. In this case, there are advantages in that brazing and plating are easy and processing is also easy, but the problem of insufficient strength and springiness remains unsolved. This invention was made in view of the above circumstances, and has excellent properties as an eyeglass frame material.
Ti-Ni clad material, especially pure Ti with excellent workability
The object of the present invention is to provide a method for obtaining a composite material for eyeglass frames with improved springiness and strength by further improving a Ti--Ni cladding material having a core material of the present invention. In other words, the method of this invention involves processing a clad material with a core material of Ti (titanium) and an outer covering of Ni (nickel) or a Ni-based alloy, and then processing the material at a temperature exceeding 800℃.
Heat treatment is performed at a temperature of 1000℃ or less to diffuse and form a solid solution of Ni and other alloying elements in the outer jacket into the Ti core material.
As a result, the core material is made of Ti alloy to improve strength and springiness, and the surface layer is made of Ni.
Alternatively, good brazing and plating properties can be maintained by leaving a Ni-based alloy. The method of the present invention will be explained in more detail below. When carrying out the method of this invention, as shown in FIG. 1A, pure Ti is used as the core material 1 and Ni
Or cladding material 3 with Ni-based alloy as outer covering 2
Create it. Here, the Ni-based alloy is Ni
A material to which an appropriate amount of one or more of Cr, Cu, Al, Mo, etc. is added may be used. For the clad material 3 as described above, Fig. 1B
As shown in Figure 2, plastic processing such as wire drawing is performed to obtain the dimensions and shape of the product or a state close to the dimensions and shape of the product. In this clad material processing stage, the inner core material 1
The workability is good even when pure Ti remains, and the workability is extremely good when the outer cover 2 is also made of pure Ni.Also, when the outer cover 2 is made of a Ni-based alloy, the workability is lower than that of pure Ni, but when the outer cover 2 is made of pure Ni, the workability is lower than that of pure Ni. Since it is better than alloys, it has good workability as a whole, and therefore there is no particular difficulty in processing. Next, the clad material 3, which has reached the dimensions and shape of the product or a state close to it, is subjected to a diffusion heat treatment.
That is, the Ni element in the Ni or Ni-based alloy of the outer cover or alloy elements such as Cr, Cu, Al, Mo, etc. is diffused into the core material and dissolved in the Ti of the core material.
In addition, in this diffusion heat treatment, Ni and the like on the boundary side of the outer covering with the core material must be diffused into the core material, but conversely, Ni or Ni-based alloy in the surface layer must remain as is. In other words, if the surface layer becomes a Ti alloy, brazing and plating properties will be impaired, so it is necessary to set the time and temperature of the diffusion heat treatment so that at least the surface layer remains as Ni or a Ni-based alloy. There is. Specifically, the temperature in this diffusion heat treatment is such that the elements to be diffused from the outer cover are sufficiently diffused to the center of the core material, sufficiently improving the springiness and strength, and the core material reaches to the surface layer of the outer cover. The temperature needs to be above 800°C and below 1000°C to prevent Ti from diffusing. If this heat treatment temperature is below 800℃,
It takes a long time to sufficiently diffuse into the center of the core material and sufficiently improve the springiness and strength, which reduces productivity. On the other hand, if the heat treatment temperature exceeds 1000°C, there is a risk that Ti from the core material will diffuse to the surface layer of the outer cover and the surface layer will become a Ti alloy layer. The composite material obtained in this way has a core part 1
A (see Figure 1 C) is Ti, but Ni, Cr, Cu,
The resulting Ti alloy contains Al, Mo, etc. as a solid solution, and as a result, the overall springiness and strength are significantly improved compared to when pure Ti is used as the core material. And since the surface layer 4 remains as Ni or Ni-based alloy,
It also has good brazing and plating properties. Examples of this invention will be described below. Example 1 A core rod of pure Ti (JIS Class 2) with an outer diameter of 30 mm and a length of 1000 mm was inserted into a pure Ni pipe with an outer diameter of 36 mm, a wall thickness of 3 mm, and a length of 1000 mm, and the resulting cladding was fitted. The material was annealed and wire-drawn to produce a wire rod with an outer diameter of 2.6 mm. Note that in this state, the cross-sectional area ratio of Ni in the portion of the wire excluding both ends is approximately 18%.
After cutting this to a length of 80 mm, it was annealed at 500°C for 1 hour in an argon gas atmosphere, tapered by swaging a 40 mm part from one end, and then tapered by 45 mm from the opposite end to the swaged side. The area up to this point was pressed to a thickness of approximately 0.8 mm.
This was subjected to a diffusion treatment at 900° C. for 5 hours in an argon gas atmosphere, and then put into water and rapidly cooled to obtain a composite material for eyeglass frames. When the composite material obtained in this example was examined, it was confirmed that the core material portion was made of a Ni-Ti alloy, and a single Ni layer remained on the surface layer. In addition, diffusion heat treatment was performed in the same manner as in the above example.
The present invention with a Ni cross-sectional area ratio of about 18% applied at 900°C for 5 hours
Ni-Ti composite material C, the present invention Ni-Ti composite material D with a Ni cross-sectional area ratio of 18%, which was subjected to diffusion heat treatment at 900°C for 10 hours.
When we investigated the tensile strength and spring limit value of comparative example Ni-Ti clad material B with a Ni cross-sectional area ratio of approximately 18% that was not subjected to diffusion heat treatment, and JIS type 2 Ti single material A that does not contain Ni, we found that The results shown in FIG. 2 were obtained. From Fig. 2, composites C and D obtained by the method of this invention are Ti single material A,
It is clear that the strength and elasticity are improved compared to Ni-Ti clad material B which is not subjected to diffusion heat treatment. Next, an example using a Ni-based alloy as the outer cover will be shown. Example 2 Ni-10% outer diameter 36mm, wall thickness 3mm, length 1000mm
Pure Ti with outer diameter 30mm and length 1000mm in Cu alloy pipe
A core rod (equivalent to JIS Class 2) was inserted and fitted, and the resulting clad material was annealed and wire-drawn to produce a wire rod with an outer diameter of 2.6 mm. After cutting this to a length of 80 mm, it was annealed at 650°C for 1 hour in an argon gas atmosphere, tapered 40 mm from one end by swaging, and then 45 mm from the opposite end to the swaged side. The area up to this point was pressed to a thickness of approximately 0.8 mm. This was subjected to a diffusion treatment in an argon gas atmosphere at 900°C for 5 hours or 900°C for 10 hours, and then put into water and rapidly cooled to obtain a composite material for eyeglass frames. When the composite material obtained in this example was examined, it was found that Ti in the core material was alloyed and Ni-
It was confirmed that Cu alloy remained. In addition, diffusion heat treatment was performed at 900℃ x 5 as described above.
Composite material subjected to time treatment and diffusion heat treatment at 900℃
When the tensile strength and spring limit value were investigated for the composite material treated for 10 hours and the composite material not subjected to the diffusion heat treatment, the results shown in the upper row of Table 1 were obtained. Example 3 Ni-10% outer diameter 36mm, wall thickness 3mm, length 1000mm
Pure Ti with outer diameter 30mm and length 1000mm on Cr alloy pipe
A core rod (equivalent to JIS Class 2) was inserted and fitted, and the resulting clad material was annealed and wire-drawn to produce a wire rod with an outer diameter of 2.6 mm. After cutting this to a length of 80 mm, it was annealed at 750°C for 1 hour in an argon gas atmosphere, tapered 40 mm from one end by staging, and then 45 mm from the opposite end to the swaged side. It was pressed to a thickness of approximately 0.8 mm. This is carried out under the conditions of 900℃ x 5 hours in an argon gas atmosphere or at 900℃.
After being subjected to diffusion treatment for 10 hours, the mixture was poured into water and rapidly cooled to obtain a composite material for eyeglass frames. When the composite material obtained in this example was examined, it was found that Ti in the core material was alloyed and Ni-
It was confirmed that Cr alloy remained. In addition, diffusion heat treatment was performed at 900℃ x 5 as described above.
The results of examining the tensile strength and spring limit values of composite materials treated under the same condition of 10 hours, composite materials treated with diffusion heat treatment at 900°C for 10 hours, and composite materials without diffusion heat treatment. are shown in the lower part of Table 1.

[Table] As is clear from Table 1, Ni-
In both the case of Example 2 using a Cu alloy and the case of Example 3 using a Ni-10% Cr alloy as the outer cover, diffusion heat treatment was performed at a temperature exceeding 800°C and below 1000°C. As a result, a composite material with excellent strength and elasticity was obtained. As is clear from the above explanation, according to the method of the present invention, it is possible to obtain a composite material for eyeglass frames that has excellent strength and elasticity as well as good brazing and plating properties. Therefore, the method of the present invention is extremely suitable for manufacturing eyeglass frame parts, especially parts such as bridges and temples that require strength and springiness.

[Brief explanation of the drawing]

1A to 1C are schematic cross-sectional views showing step-by-step an example of the manufacturing process of a composite material for eyeglass frames according to the method of the present invention, and FIG. It is a graph showing the tensile strength and spring limit value of a composite material for eyeglass frames. 1...core material, 2...outer cover, 3...cladding material.

Claims (1)

[Claims] 1 After processing a clad material whose core material is Ti and whose outer sheath is Ni or Ni-based alloy, the temperature exceeds 800℃.
The outer coating is made of Ni by heat treatment at a temperature below 1000℃.
Or, an eyeglass frame characterized in that the core material portion is made of a Ti alloy by diffusing and dissolving Ni or alloy elements in the Ni-based alloy into the Ti core material, while leaving the surface layer as Ni or Ni-based alloy. Manufacturing method for composite materials.