JPS5985391A - Production of composite material for spectacle frame - Google Patents

Abstract

PURPOSE:To improve workability and to obtain a composite material having an excellent spring characteristic and strength by diffusing the element of Ni or Ni and Sn plating formed on the inside surface of an Ni-Cr alloy pipe into a specific copper alloy core material inserted into said pipe. CONSTITUTION:Ni plating layer or two plating layers of Ni and Sn are applied on the inside surface of an Ni-Cr alloy pipe to form a plating layer 2. A copper alloy core material 3 of one kind among Cu-Ni-Sn-Zn, Cu-Zn, Cu-Ni-Zn alloys is inserted and fitted to the inside of the pipe 1. A pipe 4 of iron or the like is usually fitted for the purpose of protection onto the pipe 1 after said fitting and the pipe is subjected to drawing to adhere thoroughly and tightly the layer 2 and the material 3. The pipe is then subjected to a diffusion heat treatment to diffuse the Ni and Sn in the layer 2 into the material 3. Then the material 3 is thickened with the concns. of Ni and Sn and is strengthened, whereby the spring characteristic and strength are much more improved and the layer 2 and the material 3 are united to one body, resulting increased bond strength. The pipe 4 is hereafter stripped off adequately.

Description

[Detailed Description of the Invention] Is this invention pI? Composite I for Iff frame parts
Regarding the 'J method, especially when manufacturing a composite material with an outer jacket made of a Ni Cr alloy, the inner surface of a pipe made of a Ni or Cr alloy is coated with Ni or Ni Sn 2 P! After plating, a copper-based alloy core material is inserted and diffusion heat treatment is performed to diffuse Ni and Sn in the plating layer into the 1M gold alloy core material to improve the springiness and strength of the core material, and N;
-0 "It is designed to prevent oxidation during heat treatment of the alloy.

As is well known, Ni Cr alloys have good corrosion resistance, are white, and have good decorative properties, so they are widely used as materials for eyeglass frame parts. However, when Ni-Cr alloys are used alone for eyeglass frame parts, there are problems such as insufficient springiness, high cost, and difficulty in processing. Therefore, it has been known to use a cladding material for eyeglass frame parts, which has a Ni--Cr alloy as an outer covering and a core material of phosphor bronze, beryllium copper, stainless steel, or the like. However, in this case, there is a problem that cladding failure may occur if the atmosphere is insufficiently adjusted when cladding Ni-Cr based alloy onto phosphor bronze, beryllium copper or stainless steel circles, and especially when phosphor bronze is used as the core material. However, when beryllium copper is used as the core material, the cladding properties are not good. However, heat treatment is required to give it springiness, and if stainless steel is used as the core material, high temperatures are required for the cladding, but processing is more difficult than when using other metals. There are some difficult issues.

This invention was made in view of the above circumstances, and in manufacturing a composite material for eyeglass frame parts whose outer sheath is covered with Ni Cr alloy, it improves workability and at the same time stabilizes the cladding, thereby preventing cladding defects. Don't let it happen,
The purpose of this invention is to provide a composite material with excellent spring properties and strength.

That is, in the method of the present invention, either Ni plating or two-layer plating of Ni and Sn is applied to the inner surface of a vibrator made of a NiCr-based alloy, and then Cu -
Ni-Sn-Zn alloy, Cu-Zn alloy, Cu
A core material made of an l-based alloy selected from -Ni-Zn alloys is inserted, and then diffusion heat treatment is performed to diffuse the elements of the plating layer into the core material. By providing a plating layer on the plated layer, oxidation of the Ni Cr alloy during heat treatment is prevented, thereby preventing the occurrence of cladding defects.
By diffusing into the core material, the strength and springiness of the copper-based alloy of the core material are improved, and by making the core material a copper-based alloy, the workability is also improved.

The method of the present invention will be explained in more detail below.

In the method of this invention, first, as shown in FIG.
A plating layer 2 of Ni or Ni and Sn is formed by performing N1 plating or two-layer plating of Ni and Sn. Here, as a Ni Cr alloy, 0" is 3 to 1
It is desirable to use a material containing 8fiff and 1% culm and the remainder being 1'Ji, and there is no hindrance to the inclusion of a small amount of additional elements such as A9. In addition, it is desirable that the thickness of the plating layer 2 should be approximately 10 J, 1 m to 4 (lt'l).
When applying two-layer plating of o) +! It is NiCr
It is desirable to first apply Ni plating to the inner surface of the vibrator 1 made of the alloy, and then apply Sn plating to the Ni plating layer.

After forming the plating layer 2 of Ni or T 11 and Sn on the inner surface of the Ni-Cr alloy vibrator 1 as described above, a core material 3 of a copper-based alloy is formed on the inner surface as shown in FIG. 1(B). Insert and mate. As this l-based alloy, Cu
-Ni -Sn -Zn alloy, Cu -Zn alloy, CI
1f selected from Ni-Zn alloy! Use later.

These #f1 base alloy alloy deviations also have good workability,
It also has good springiness and strength.

After fitting the copper-based alloy core material 3 inside the plating layer 2 in this way, the Ni
A vibrator 4 made of iron or the like for protection is fitted to the outside of the Cr-based alloy pipe 1, and a drawing process is performed to bring the plating layer 2 and the copper-based alloy core 3 into sufficient contact. However, since the vibrator 4 is to be removed after the subsequent diffusion heat treatment, a material H such as iron, which is not bonded to the Ni Cr alloy vibrator 1 at the diffusion heat treatment temperature, is used.

Next, heat treatment is performed to diffuse Ni and Sn of the plating layer 2 into the copper-based alloy of the inner core material 3. Due to this heat treatment, the copper-based alloy of the core material 3 becomes N due to diffusion from the plating layer 2.
The P degree and Sn concentration are increased and strengthened, and the springiness and strength are further increased, and at the same time, as shown in FIG. As a result, the bond <ml of the gate becomes significantly large.Also, due to this expansion, at the time of Alμ, the NiC of Vibe 1
Since the plating layer 2 exists on the inner surface of the r-based alloy, Ni
Oxidation does not occur on the inner surface of the Cr-based alloy, and clad defects with the core material are effectively prevented. In other words, even if the atmosphere is insufficient during heat treatment, clad defects due to internal oxidation can be effectively prevented.

For this J: sea urchin diffusion heat-treated basket, the outer 5A edible vibrator 4 made of iron or the like is usually peeled off and removed by hand and the remaining inner crud material, as shown in Figure 1 (E). As shown in the figure, Ni Cr alloy is removed? ! '! 1Δ and N1
A composite material having a core material 3A made of an L-based alloy dense with Sn and Sn is subjected to additional processing, bonding processing, etc. to make eyeglass frame parts.

As mentioned above, in the final 71 nm composite parts, the mm gold alloy T1i and S
Since n is concentrated, the springiness and strength are extremely excellent. In particular, the copper-based alloy of the R-end core material exhibits so-called superelasticity.
The composition of the initial base alloy and the subsequent diffusion and solid solution of Ni and SII due to thermal 91 theory are set to determine J
3, the springiness will be better.

Furthermore, since the surface of the composite material is made of a Ni Cr alloy, it has excellent corrosion resistance and good brazing properties. On the other hand, in the manufacturing process, heat treatment is performed after forming a plating layer of Ni or Ni and S11 on the inner surface of the i-, Ji-Cr-based alloy vibrator.
There is less risk that the inner surface of the alloy pipe will oxidize and cause clad defects, and as a result, it becomes easier to set the heat treatment atmosphere. Furthermore, since the core material is a copper-based alloy, it is easy to process and has high productivity.

Examples of the present invention will be described below.

Example 1 Outer diameter: 45 mm, wall thickness: 1. Ni plating was added to the inner surface of a NiNi-1o%Cr alloy pipe with a length of 400IIlta to a thickness of 20mm, and then C1l- was added to the inside of the vibrator.
A 2wt%NiAt%Zn-5wt%S1 alloy rod is fitted, and an outer diameter of 49I is placed on the outside of the NiCr-based alloy vibrator! 1IIl, fit an iron pipe with an inner diameter of 45 mm and a length of 400 mm, and then
The Ni plating layer and the Cu--Ni--Sn--zn alloy rod as a core material were brought into close contact with each other by performing a drawing process using a die. Furthermore, diffusion heat treatment was performed at 700°C for 1 hour in hydrogen to transform the Ni plating layer into Cu − as a core material.
N; -8n - Diffused into Zn alloy. Next, a groove is cut into the outer iron pipe using a milling cutter, and the iron pipe is peeled off from the inner cladding material, and then the cladding material is handled, and further annealed and wire-drawn. (
imm wire rod.

Example 2 After applying Ni plating to a thickness of 20 mm on the inner surface of the same NiCr-based alloy pipe as used in Example 1, the N
On the i plating layer, SI and plating were applied to a thickness of 20 JJm to form a two-layer plating of Ni and Sn, and then a Cu Ni 5IIZh alloy rod similar to that in Example 1 was inserted and fitted inside it, and the following Example 1 was performed. A 2.6 mm composite wire was obtained in the same manner.

Comparative Example The same t! as used in Example 1. A composite wire of 2.61Il111 was folded in the same manner as in Example 1 except that the inner surface of the -Cr alloy was not plated with N1.

When the cladding yield in each of the above Examples and Comparative Examples was investigated, the results shown in Table 1 were obtained. However, here, the crut yield is the current value of the composite material product obtained by removing poor adhesion (defective cladding) from the composite material obtained by each product, and the total ff of the composite material obtained by 1q from each product.
It is shown as a ratio to 1fi.

In addition, at the final processing stage in each example and comparative example,
Bake at 0℃ for 30 minutes! ! After pressing, the thickness is 0.5m.
m, width 4.5 mm, length 10 (1 m composite material at 1%, the results of examining the spring values of each composite board are shown in Table 1 (also shown). However, in this spring 1iIIi!!9 (Well, chuck one end of the board, apply a load to the opposite end around the chuck part, bend it 30 degrees, remove the load, and find the return angle θ when the board returns, θ/30X10
A value of 0 (%) was displayed as a spring value.

From Table 1, it is clear that the composite materials obtained by the method of the examples of the present invention have good clad adhesion, high clad yield, and excellent spring properties.

As is clear from the above explanation, according to the method of this invention,
It is possible to obtain a composite material for eyeglass frames that has excellent spring properties and strength and has good surface corrosion resistance, and various effects such as extremely low occurrence of clad defects and ease of processing are obtained.

[Brief explanation of the drawing]

FIGS. 1 (Δ) to (E) are schematic sectional views showing step-by-step an example of the method of the present invention. DESCRIPTION OF SYMBOLS 1... Ni-Cr alloy vibe, 2... Plating layer, 3... Copper-based alloy core material. Figure 1 (E)

Claims (1)

[Claims] Ni plating and Ni plating on the inner surface of the pipe made of Ni Cr alloy.
-Sn-Zn alloy, C+
A core material made of a copper-based alloy of either + -Zn alloy or Cu + Ni -Zn alloy is pressed into the core material, and then diffusion heat treatment is performed to diffuse the elements of the target plating layer into the core material. Featured I! Chi 1 method of composite material for mirror frames.