JPS61273945A - Composite blank for frame of spectacle - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to the improvement of a composite material for eyeglass frames, and more specifically, the present invention relates to the improvement of a composite material for eyeglass frames, and more specifically, I! Regarding composite materials for mirror frames.

(Prior art and its problems) Recently, there has been a demand for eyeglasses and mirrors with lightweight lenses and frames, from the point of view of expanding the range of activities of eyeglass wearers and from the viewpoint of comfort.

゛ Ti or Ti alloys have recently been used as materials for eyeglass frames to meet these demands.

However, Ti or Ti alloys have poor brazing properties and must be brazed in a high vacuum or in a special atmosphere in order to have strong strength, and improvements in this respect have been desired. .

As one of the means, as shown in Fig. 3, Ti or Ti
A method is adopted in which an alloy is used as a core material and a material 2 having good corrosion resistance and brazing properties is clad on the outside thereof, such as a Ni--Cr alloy, a gold alloy, a silver alloy, or the like.

However, although this method has the advantage of preventing oxidation or nitridation of the Ti or Ti alloy core material 1 and allowing easy brazing in the atmosphere, the composite material 3 for eyeglass frames is rolled into a sheet material. 4, and this plate material 4 is heated to 600~ using a brazing material 5 such as Ag wax or Au wax as shown in Fig. 4.
When brazing at 900°C, a very brittle intermetallic compound 6 is generated at the interface between the core material 1 and the outer material 2, so this layer of intermetallic compound 6 peels off after brazing, which is a fatal drawback. was there.

(Objective of the Invention) The present invention has been made to solve the above drawbacks. 1. It is possible to braze in the atmosphere, and the brazing strength is 1. It is an object of the present invention to provide a composite material for eyeglass frames, which has a significantly high thickness and which does not cause peeling between the core material and the outer material.

(Structure of the Invention) The composite material for eyeglass frames of the present invention is as shown in FIG.
Ti or Ti alloy is used as the core material 1, W is provided as an intermediate layer 7 on the outside of this, and a material 2 having good corrosion resistance and excellent brazing properties, such as Ni-Cr alloy or gold, is provided on the outside of this intermediate layer 7. It is made of cladding of alloy, silver alloy, etc.

The composite material 3' for eyeglass frames having such a structure is pressed to form a plate material 4', and this 4' is coated with Ag wax, A as shown in FIG.
Even if a brazing material 5 such as U brazing material 5 is used, if brazing is performed in the atmosphere at 600 to 900°C, the diffusion of Tf in the core material 1 will be reduced by the W in the intermediate layer 7.
is suppressed and the formation of intermetallic compounds is prevented. Therefore,
There is no peeling after brazing, and good brazing with high brazing strength can be obtained.

Note that W may be vapor-deposited on the surface of Ti or Ti alloy, or a plate or tube of W may be inserted between the core material and the outer covering material to form a cladding.

Next, specific examples and conventional examples will be described in order to clarify the effects of the composite material for eyeglass frames of the present invention.

(Example 1) As shown in FIG. .25 ma+
A composite material 3' for eyeglass frames clad with 10 wt% Ni-Cr alloy 2 is rolled to form a plate material 4' with a thickness of 0.75 am, and this plate material 4' is made into a material as shown in Fig. 4.
A test piece was obtained by brazing at 830° C. in the atmosphere using a brazing filler metal 5 containing 28 wt % of g-Cu.

(Example 2) As shown in FIG. 1, <Ti95wt%, Aj! 3wt%, V
A Ti alloy consisting of 2wt% is used as a core material 1 with a diameter of 3mm,
W with a thickness of 0.008 mm is clad on the outside of these as an intermediate layer 7, and a layer with a thickness of 0.25 m is clad on the outside of this intermediate layer 7.
A composite material 3' for eyeglass frames, which is made of 18 m of gold alloy 2 and clad with gold alloy 2, is rolled to 0.75IIIIIIIN-
A plate material 4' is made, and this plate material 4' is
g A test piece was obtained by brazing in the atmosphere at 830° C. using a brazing filler metal 5 containing 28 wt % of Cu.

(Conventional example) As shown in Fig. 1, a composite material 3 for eyeglass frames is made of Ti as a core material 1 with a diameter of 3, and a Ni-Cr 10wt% alloy 2 with a thickness of 0.25 m is clad on the outside of the core material 1. A plate material 4 having a thickness of 0.75 mm was produced by rolling, and this plate material 4 was brazed in the atmosphere at 830° C. using a brazing filler metal 5 having 28 wt % of Ag and Cu as shown in FIG. 4 to obtain a test piece.

However, when the test pieces of Example 1.2 and the conventional example were subjected to a tensile test, the results shown in the table below were obtained.

*Number of test pieces: 5 As is clear from the table above, the test piece of Example 1.2 has significantly higher breaking strength and bonding strength than the conventional test piece. In addition, in the test piece of the conventional example, the clad surface of the core material 1 and the outer material 2 was the fracture surface, whereas in the test piece of the example, the base material was the fracture surface, and the core material 1 and the outer material 2 It can be seen that the bonding strength with

(Effects of the Invention) As detailed above, the composite material for eyeglass frames of the present invention has the following features:
It is possible to braze in the atmosphere and has excellent brazing workability.Moreover, the strength of brazing is extremely high.Furthermore, the core material and outer material do not separate, so it has excellent durability, functionality, and is lightweight. Composite for eyeglass frames - It can be said to be a revolutionary material.

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[Brief explanation of the drawing]

Figure 1 shows a cross section of the composite material for eyeglass frames of the present invention:
The plan view and Figure 2 are plates and materials obtained by rolling the composite material.1. Figure 3 is a cross-sectional view of a test piece obtained by brazing + pi ■. It is a sectional view of a test piece obtained by brazing the plate material obtained by rolling the composite material. Applicant Tanaka Kikinzoku Kogyo Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 4 figure

Claims (1)

[Claims] A composite material for eyeglass frames, characterized in that the core material is Ti or Ti alloy, the intermediate layer is W, and the outside is clad with a corrosion-resistant material.