JPS6135419A - Composite blank material for spectacle frame - Google Patents

Abstract

PURPOSE:To permit brazing in atmosphere and to prevent the exfoliation between a core material and outside material as the brazing strength is extremely high by using Ti or Ti alloy as a core material, cladding a Cu-Ni alloy as an intermediate layer thereon and cladding a corrosion resistant material on the outside. CONSTITUTION:The Ti or Ti alloy is used as the core material 1 and the Cu-Ni alloy is clad as the intermediate layer 7 on the outside. The material 2 such as Ni-Cu alloy, gold alloy or silver alloy having good corrosion resistance and excellent brazing property is clad to the outside of said layer 7. The brazing in atm. is thus made possible with excellent workability; in addition, the brazing strength is extremely high and the exfoliation between the core material and the outside material is obviated. The composite blank material for a lightweight spectacle frame having excellent durability and functionality is thereby obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement of a composite material for eyeglass frames, and more particularly, to a composite material for eyeglass frames that has strong cladding strength and excellent brazing properties. .

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

Recently, Ti or Ti alloys have been used as materials for eyeglass frames to meet such 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.
An alloy is used as the core material 1, and a material 2 having good corrosion resistance and brazing properties is provided on the outside of the core material 1, such as Ni-Cr alloy, gold alloy, etc.
A method of cladding with silver alloy or the like has been adopted.

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 is made, and this plate material 4 is heated to 60 mm using a brazing material 5 such as Ag wax or Au wax as shown in Fig. 4.
When brazing in the air at 0 to 900°C, a very brittle intermetallic compound 6 is generated at the interface between the core material 1 and the outer material 2, so the layer of intermetallic compound 6 peels off after brazing. There was a fatal flaw.

(Purpose of the Invention) The present invention has been made to eliminate these drawbacks, and it is possible to braze in the atmosphere, has extremely high brazing strength, and is resistant to peeling between the core material and the outer material. The purpose of this invention is to provide a composite material for eyeglass frames that is not available before.

(Structure of the Invention) The composite material for eyeglass frames of the present invention is as shown in FIG.
A core material 1 is made of Ti or a Ti alloy, and a Cu-Ni alloy is clad on the outside as an intermediate layer 7, and a material 2 having good corrosion resistance and brazing properties, such as Ni- Cr alloy.

It is clad with either gold alloy or silver alloy.

(Function) The composite material 3' for eyeglass frames having such a structure is rolled to form a plate material 4', and this plate material 4' can be formed using a brazing material 5 such as Ag wax or Au wax as shown in FIG. 600~900°
C When brazing in the atmosphere, a solid solution 8 of the core material 1 and the intermediate layer 7 is formed, so it does not exhibit brittleness but is rather strengthened. Therefore, there is no peeling after brazing, and good brazing with high brazing strength can be obtained.

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.
and Cu-Ni30 with a thickness of 0.002 m is placed on the outside of this.
% alloy material is clad as an intermediate layer 7, and on the outside of this intermediate layer 7 a Ni-Cr 10% alloy 2 with a thickness of 0.17 mm is clad.
Composite material 3' for eyeglass frames is clad with
A plate material 4' having a thickness of 0.7511 m was made by rolling, and this plate material 4' was brazed in air at 830°C using a brazing material 5 containing 28% Ag-Cu to obtain a test piece as shown in Fig. 2. Ta.

(Example 2) As shown in Fig. 1 (Ti-A13%-v2% alloy alloy diameter 2
, 611 as core material 1, and a thickness of 0.0021 on the outside of this.
Composite material 3 for eyeglass frames, in which a Cu-Ni2O% alloy material of 20% is applied as an intermediate layer 7, and a gold alloy 2 is clad with a layer 18 having a thickness of 0.17 m on the outside of this intermediate layer 7.
' was rolled to form a plate material 4' with a thickness of 0.75 m1, and this plate material 4' was brazed in the atmosphere at 830°C using a brazing material 5 of <Ag-Cu 2B% as shown in Fig. 2. Got a test piece.

(Conventional example) As shown in Fig. 3, the second type Ti is used as the core material 1 with a diameter of 2.6H, and the outside of this is made of Ni-Cr10 with a thickness of 0.175n.
A composite material 3 for eyeglass frames clad with a 28% alloy 2 is rolled to form a plate 4 having a thickness of 0.75n, and this plate 4 is coated with a brazing material 5 of 28% Ag-Cu as shown in FIG. A test piece was obtained by brazing at 830°C in the atmosphere.

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.

(Left below) *Number of test pieces = 51 As is clear from the table above, the test piece of Example 1.2 has significantly higher breaking strength and higher bonding strength than the conventional test piece. In addition, in the test piece of the conventional example, the joint surface between the core material 1 and the outer material 2 was a fracture surface, whereas in the test piece of the example, the base material was a fracture surface, and the joint surface between the core material 1 and the outer material 2 was a fracture surface. It can be seen that the bonding strength is high.

(Effects of the Invention) As detailed above, the composite material for eyeglass frames of the present invention has the following features:
Brazing can be performed 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. It can be said to be an innovative composite material for eyeglass frames.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a composite material for eyeglass frames of the present invention, Fig. 2 is a cross-sectional view of a test piece obtained by brazing a plate obtained by rolling the composite material, and Fig. 3 is a cross-sectional view of a conventional eyeglass frame material. FIG. 4 is a cross-sectional view of a composite material for a frame, and a cross-sectional view of a test piece obtained by brazing a plate obtained by rolling the composite material. Applicant: Tanaka Kikinzoku Kogyo Co., Ltd. Figure 1 Figure 2 1:5 Teneo 5: Rooi Figure 3 Figure 4

Claims (1)

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