JPS5984219A - Composite material for spectacles frame - Google Patents

Abstract

PURPOSE:To prevent interlayer exfoliation and to obtain a titled composite material having an excellent spring property by coating a core material consisting of Ti (alloy) with Mo. CONSTITUTION:A bar-like core material consisting of Ti (alloy) is inserted and fitted into a pipe consisting of Mo having a prescribed inside diameter and after the pipe is worked to a product shape or approximate to the product shape, the worked material is subjected to a diffusion heat treatment at 700-950 deg.C to diffuse and solubilize Mo into Ti. Then the material permits easy hot working and annealing without formation of an intermetallic compd. in the boundary between the sheath and the core material in the stage of heat treatment and the decrease in yield owing to the generation of peeling occuring in the intermetallic compd., thus defective cladding is prevented. A composite material ideal for spectacles frame parts for which a spring property and strength are required and the exfoliation of the sheath in the brazed part is of a problem are thus obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a composite material (cladding material) for eyeglass frame parts that uses T1 as a core material, and in particular, by using pure Ma1 as the outer covering, the boundary layer between the core material and the outer covering is reduced during heat treatment. This prevents the formation of brittle intermetallic compounds in the parts, thereby preventing the occurrence of problems such as delamination, and also enables the diffusion of JO (through heat treatment) into the Ti, thereby improving the springiness by alloying the Ti. It was designed to be possible.

As is well known, Ti has properties such as extremely excellent corrosion resistance, light weight, and high strength when alloyed, and for this reason, it is considered to be applied to eyeglass frame materials.

However, since T1 and Ti alloys have a strong phase force with oxygen, it is difficult to attach them through filtration due to the oxide film on the surface, and therefore it is difficult to apply them as is to eyeglass frames that require parts such as hinges to be brazed. It is. Also, for the same reason, it is difficult to plate the surface, and while Ti has good workability as a pure metal, it does not have sufficient strength or elasticity for eyeglass frames, and conversely, when alloyed to make a Ti alloy, Although it can provide strength and springiness, it is difficult to process, and there is a problem in cases where thinning of the wire is required, such as in eyeglass frames.

Recently, Ti-Ni clad materials have been developed, which have a core made of pure Ti and an outer covering made of N, which has good brazing properties and plating properties, or Ti-Ni clad materials, which also have good brazing properties and can be plated. T+ - where unnecessary ^U and Ni-Or alloy outer covering is clad with pure Ti core material.
It has been considered to use Au cladding materials, Ti (Ni-Or) alloy cladding materials, etc. for eyeglass frame parts. However, in either case, there is a risk that brittle intermetallic compounds may be formed in the boundary layer between the core material and the outside due to heat treatment such as annealing or hot rolling during processing, and therefore it is quite difficult to set processing conditions. In addition to this, the interlayer strength tends to be unstable, so there is a problem that the outer coating layer tends to peel off from the core material due to external force, especially in brazed parts, and there is also the problem of a large drop in yield due to cladding defects. be.

This invention was made in view of the above circumstances.
By using pure 10 (molybdenum) as the outer covering for W&mirror frame composite materials that have a core material of (titanium) or Ti alloy, intermetallic compounds are not generated in the boundary layer between the outer covering and the core material during heat treatment. This makes it easier to set the processing conditions, solves the problem of peeling of the outer coat layer, and improves the yield.At the same time, diffusion heat treatment allows the Mc+ of the outer coat to be diffused into the Ti core material. It is an object of the present invention to provide a composite material for eyeglass frames in which the springiness of the core material can be easily improved by solid solution.

The composite material for mm frames of the present invention will be described in more detail below.

As shown in FIG. 1, the composite material for eyeglass frames of the present invention is made up of a core material 1 made of Ti or a Ti alloy, and an outer sheath 2 made of pure Mo cladding on the outside. Here, when 10 and Ti are combined, a total solid solution is produced, so that no intermetallic compound is produced in the boundary layer between the jacket 2 and the core material 1 during heat treatment. That is, since brittle intermetallic compounds are not generated between layers due to heat treatment for annealing, hot rolling, etc. in the processing stage, it is extremely easy to set heat treatment conditions and processing conditions, and hot rolling is also possible. Furthermore, as mentioned above, since Ti and oxidation form a complete solid solution, UO is diffused into the core material by heat treatment, and as a result, the core material becomes an IIO solid solution type T: alloy, which improves the elasticity and strength. is significantly improved.

Furthermore, as mentioned above, as the outer covering layer is diffused into solid solution in the Ti of the core material, the outer covering layer and the core material part are integrated, and the strength between them is significantly increased, which causes the problem of peeling of the outer covering layer. This effectively prevents the occurrence of this problem, and also effectively prevents a decrease in yield due to cladding defects.

Next, method 3 for producing a composite material for eyeglass frames according to the present invention will be described. First, a rod-shaped core material made of pure Ti or a Ti alloy is inserted and fitted into a vibrator made of pure MO having a predetermined inner diameter. After this, processing is performed to make the product shape or a state close to the product shape, and after processing, M
A final diffusion heat treatment is performed to diffuse and dissolve u into Tr.

However, it is desirable to perform primary diffusion heat treatment before processing. This second diffusion heat treatment is different from the final diffusion heat treatment for actively diffusing MO into Ti.
This is simply for joining the external Me pipe and the Ti core material, so it is sufficient to perform a milder heat treatment than the final diffusion heat treatment.

Note that before this secondary diffusion heat treatment, it is desirable to perform a light process such as die drawing process in order to bring the inner surface of the outer MO pipe and the outer surface of the core material into close contact with each other.

In addition, in the processing stage, in the case of the composite material of the present invention, hot rolling is possible because intermetallic compounds are not generated as described above, and therefore, when the degree of processing is large, hot rolling and cold working are used in combination. I can do 4-.

The temperature of the final diffusion heat treatment may be selected at a temperature at which Me is efficiently diffused into the T1 core material, and is usually 700 to 700.
The temperature may be about 950°C. Although the workability of the core material is reduced by dissolving IJo in the Ti core material, the final diffusion heat treatment is performed after processing as described above, so the processing step t is not very concentrated in the core material. It is easy to process.

When the composite material of the present invention is used for eyeglass frame parts, it goes without saying that the surface may be plated. Here, since uo has better plating properties than Ti alloy, when plating is performed, the final diffusion heat treatment is performed so that the surface layer does not become Ti alloy, that is, Ili Tt II remains in the surface layer. It is desirable to set the concentration during FR.

Next, a method for manufacturing the composite material for eyeglass frames of the present invention will be described.

Outer diameter 45gnm, wall thickness 2. Omm+, length 3oowl1
A pure T1 rod with an outer diameter of 40III and a length of 300 mm was inserted into a pure 140 pipe of No. 11, and the outer circumference was squeezed with a die to bring the inner surface of the pipe and the outer surface of the T1 rod into close contact. then 10
A primary diffusion heat treatment was performed at 800° C. for 2 hours in a TORR vacuum furnace, followed by hot rolling at 800° C. to obtain a wire rod with an outer diameter of 5 m+++. After pickling the surface, cold wire drawing was performed to make the outer diameter 3.01, and the outer diameter was 8.
After annealing at 00℃ for 10 minutes, the width is 3 by pressing.
．． It was molded to a thickness of 5fi1+11 and a thickness of 0.7111111.

Subsequently, final diffusion heat treatment was performed at various temperatures from 700° C. to 930° C. for predetermined times (see Table 1).

The results of measuring the spring values of the composite materials obtained by the above method are shown in Table 1 below, corresponding to each final diffusion heat treatment condition. Note that the spring value here is 3.5 mm in width.

Thickness 0.7111. Chuck one end of a test piece with a length of 150ilWl, apply a load to a position 100InIl from the chuck part, bend it 30 degrees around the chuck part, and check the angle θ returned when the load is removed, and calculate the angle θ/30×100.
(%) is displayed as a spring value. For comparison, Table 1 also shows composite materials that were not subjected to final diffusion heat treatment.

Table 1 shows that all of the composite materials of this invention that were subjected to the final diffusion heat treatment had improved springiness, and in particular, the composite materials that were subjected to the final diffusion heat treatment at a high temperature of 930°C had significantly better spring properties. It is clear that there are Further, in all of the above-mentioned manufacturing method examples, it was confirmed that almost no cladding defects occurred.

As is clear from the above description, the composite material for eyeglass frames of the present invention does not generate brittle intermetallic compounds at the interface between the outer cover and the core material during heat treatment.
Therefore, hot working and annealing can be carried out as desired, making it extremely easy to set working conditions, and also effectively preventing peeling problems caused by brittle intermetallic compounds and a decrease in yield due to clad defects. In particular, when the Mo of the outer coating is dissolved in the core material by diffusion heat treatment,
The springiness and strength are significantly improved, and the outer sheath and core material are integrated, resulting in significantly higher interlaminar strength.Therefore, particularly springiness and strength are required, and when brazing, peeling of the outer sheath at certain points becomes a problem. Ideal for eyeglass frame parts such as temples, bridges, and rims.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an enlarged sectional view showing an example of the composite material of the present invention. 1...core material, 2...outer covering. Applicant Nippon Musical Instruments Co., Ltd. Agent Patent Attorney Yutaka 1) Hisashi Take (and 1 other person) 9- 8-

Claims (1)

[Claims] A composite material for eyeglass frames, characterized in that the core material is made of Ti or a Ti alloy and the outer covering is made of Me.