JPS61159617A - Manufacture of spectacle frame - Google Patents

Abstract

PURPOSE:To obtain a spectacle frame having excellent brazing strength and plating strength while using a Ti core material by coating a sleeve material consisting of Ni or Ni alloy on the core material consisting of Ti or Ti alloy. CONSTITUTION:The sleeve material 2 consisting of the Ni or Ni alloy is coated on the core material 1 consisting of the Ti or Ti alloy and further the core material is subjected to extrusion then drawing, by which the spectacle frame member is formed. The spectacle frame member is subjected to brazing then to a plating treatment.

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a method for manufacturing eyeglass frames using a Ti core material,
For brazing, a core material is coated with a sheath material that has good properties and plating properties, and this sheath material is used for brazing eyeglass frame members and as a base for plating processing. Brazing produces eyeglass frames with strength and plating strength.

"Prior Art" Ti material is a material with excellent corrosion resistance and is also lightweight, so it has recently attracted attention as a frame material for eyeglasses such as high-end sunglasses. However, Ti material has the disadvantage of poor brazing properties and poor plating properties.
Eyeglass frames made of I material have not yet been put into practical use.

Therefore, in order to eliminate the above-mentioned drawbacks and manufacture eyeglass frames using Ti material, a Ti base wire material around eyeglass frames has been proposed, which is made by crimping a Cu alloy cladding onto the surface of a Ti core material.

``Problems to be solved by the invention'' With this type of Ti-based wire material, brazing requires removing the Cu alloy by etching after processing, which is conventionally impractical due to the processing surface. The aim is to use Ti material, which had previously been used, for the circumference of eyeglass frames. However, with the Ti-based wire mentioned above, brazing is sometimes
Brazing had the disadvantage of low strength due to the formation of a very brittle intermetallic compound between No. 1 and the Cu alloy.

Furthermore, conventionally, there is a known technology for manufacturing eyeglass frames using a wire rod in which a Ti core material is clad with an outer skin material made of an Au alloy or an Ag alloy. Since the material has good thermal conductivity, it is somewhat difficult to braze it, and if excess solder adheres to a part, it becomes difficult to remove the excess solder without damaging the main body. There was a problem in that the appearance of the eyeglass frame was significantly impaired.

"Purpose of the Invention" The present invention was made in view of the above circumstances, and an object of the present invention is to provide a method of manufacturing an eyeglass frame that uses a Ti-based core material and has excellent brazing strength and plating strength. do.

"Means for Solving the Problems" In order to solve the above-mentioned problems, the present invention covers a core material made of Ti (titanium) or a Ti-based alloy with a sheath material made of a Ni-based alloy or a Ni-based alloy, An extrusion process is performed, followed by a wire drawing process to form a spectacle frame member, which is then brazed, and subsequently subjected to a plating process.

``Example'' The drawing shows a cross-sectional structure of an eyeglass frame manufactured by carrying out an example of the present invention. A frame is formed by cladding the sheath material 2 made of a base alloy.

Next, a case will be described in which an eyeglass frame having the above structure is manufactured by carrying out an embodiment of the present invention.

To form the eyeglass frame, first, a core material made of Ti or Ti-based alloy is covered with a sheath material made of Ni or Ni-based alloy to form a composite material.

The Ti-based alloy used here preferably contains 90% or more of Ti. The reason for this is that the Ti content is 90%.
If it is less than that, the plastic workability of the Ti-based alloy deteriorates, and
This is because the added components increase the specific gravity and impair lightweight properties. In addition, the component elements added to Ti to obtain a Ti-based alloy include AI (aluminum), Mn (manganese), Fe (iron), Cu (copper), Mo (molybdenum), C
r (chromium), ■ (vanadium), W (tungsten)
, C (carbon), one or two of the component elements are useful, and when multiple types are added, the total amount of them is 1.
Make it less than 0%. At this time, Ti or Ti-based alloy contains H, gas, 0. Usually contains gas. Furthermore,
The Ni-based alloy preferably contains 80% or more of Ni. Further, as component elements added to Ni to obtain a Ni-based alloy, Crs Cus Fe esAg
(silver), Si (silicon), S (sulfur), Pb (lead),
Pt (platinum), Au (gold), Sn (tin), Co (cobalt), rare earth elements, Mo, AI, Nb),
One or more of the constituent elements of Ti1 are useful, and when a plurality of these are added, the total amount thereof should be less than 20%.

Next, the composite material is extruded and the core material 1 and the sheath material 2 are clad and crimped, and a wire drawing process is performed to form the rim part.
Each eyeglass frame member such as a temple portion and a bridge portion is formed. Here, the cladding ratio is T
It is desirable that the volume ratio of i or Ti-based alloy be 0.7 to 0.99. The reason for this is that if the cladding ratio is smaller than 0.7, the overall weight increases, and if it is larger than 0.99, the strength of the cladding joint surface decreases, which is not preferred in practice.

Thereafter, each of the eyeglass frame members is brazed to assemble the eyeglass frame. This brazing is the core material for work! Since the sheath material 2 made of Ni or Ni-based alloy is crimped to the outside of the cladding and serves as a joint, brazing can be easily performed.

Next, the eyeglass frame is subjected to a plating treatment. In this plating process, brazing is a subsequent process, and Ni or N
Because of the treatment applied to the outer surface of the sheath material 2 made of an i-based alloy, it is easy to obtain a plated surface with good plating and a good finish. The results of experiments conducted regarding brazing strength, bending strength, and corrosion resistance will be described.

First, it is made of pure Ti, with a diameter of 50a+a and a length of 1100mm.
The core material of 0a is made of Ni-based alloy (components shown in the table shown later), outer diameter 50.5 mm, inner diameter 50 o + i, length 10
A composite material was formed by covering with a sheath material of 00 mm, and this composite material was extruded using a hot isostatic extruder at about 700° C. to produce an extruded wire rod with a diameter of 10 ts.

Next, the extruded wire rod was annealed at about 600 to 700° C. to soften it, and then cold drawn to obtain a wire rod with a diameter of 5 cm. This wire rod was annealed at 600 to 700°C and subjected to cold drawing to produce a wire rod for eyeglass frames with a diameter of 2.61°.

Regarding the weight, brazing strength, bending strength, and corrosion resistance of eyeglass frames manufactured based on the above-mentioned wire rod for eyeglass frames,
Using core and sheath materials having the compositions shown in the table below, experiments were conducted on the weight, brazing strength, bending strength, and corrosion resistance of eyeglass frames produced using the same procedures as those described above. The results are shown in the table on the next page.

The composition of the artificial sweat used in the experiment is as shown below, and a corrosion resistance experiment was conducted by immersing it in this artificial sweat for 5 days.

Sodium chloride 9.8g/Q Urea 1.7g/e Glucose 0.2g/Q Lactic acid 0.8cc Sodium sulfide 0.8g/σ Ammonia water 0.02g/(J water
In addition, the attachment and strength shown in Table 1 are the breaking strength when the bridge part and rim part of each eyeglass frame is manufactured using each material with the composition shown in Table 1 and the bridge part and rim part are peeled off. This is the value obtained by measuring the The bending strength was determined by fixing one end of the temple part of a 0.9 m thick and 3.5 am wide eyeglass frame, and applying a load to the other end with a cantilever beam with a span of 45 mm. This is the value obtained by measuring the load at the time of occurrence.

As is clear from the experimental results shown in Table 1, the eyeglass frames manufactured according to the above procedure are lightweight, have high brazing strength, and have excellent corrosion resistance against artificial sweat. In terms of bending strength, a Ti-only structure is too low and is insufficient for the circumference of eyeglass frames, but the present invention improves the bending strength and achieves a moderate value, so compared to nickel silver, which has been put into practical use in the past. It has become clear that it can be used almost as well as Ni-based alloys and Ni-based alloys.

[Effects of the Invention j As explained above, the present invention produces eyeglasses by covering a core material made of Ti or a Ti-based alloy with a sheath material made of Ni or a Ni-based alloy, performing an extrusion process, and further performing a wire drawing process. The frame member is formed, then the eyeglass frame member is brazed, and then plating is applied.The brazing provided on the outside of the core material is performed using a sheath material with good properties. ,
Compared to eyeglass frames made of Ti alone, brazing has the effect of making it easier to manufacture eyeglass frames with parts. Also,
The plating process is performed after brazing, and the plating process is performed using a sheath material made of Ni or Ni-based alloy as the base material to manufacture the eyeglass frame.In order to manufacture the eyeglass frame, the eyeglass frame has a well-finished plating surface that is free from scratches and stains. It is effective in manufacturing.

[Brief explanation of drawings]

The drawing is a sectional view of a spectacle frame manufactured by carrying out the method of the present invention.

Claims (1)

[Claims] A core material made of Ti or a Ti-based alloy is covered with a sheath material made of Ni or a Ni-based alloy, and then extruded and then wire-drawn to form an eyeglass frame member. A method for manufacturing eyeglass frames, comprising the steps of brazing the eyeglass frame members and subsequently subjecting them to plating treatment.