JPS63194225A - Production of brazed spectacle frame member - Google Patents

Abstract

PURPOSE:To prevent deformation and failure in a brazed part and the part near the same by previously subjecting the entire part of a spectacle frame member A consisting of a precipitation hardening metal and a frame member B consisting of the metal which is the same as the metal of said member or different therefrom to a soln. heat treatment followed by cold working and hardening, then heating the members except the parts to be brazed and subjecting the members to a heat treatment after brazing or to brazing after the aging treatment at the time of brazing the above-mentioned members. CONSTITUTION:At least the member A of the spectacle frame member A consisting of the precipitation hardening metal and the spectacle frame member B consisting of the metal which is the same as the metal of said member or different therefrom is previously subjected to the soln. treatment over the entire part, then the entire part is cold worked and hardened; further the parts except the part to be brazed and the region near said part are heated to relieve the work hardening and the members are subjected to the aging treatment after brazing or to the brazing after the aging treatment at the time of brazing the above-mentioned members A, B. Only the part which is removed of hardening by the heating is lost of the improvement by the cold working after the age treatment, and the brazed part and the part near the same are strengthened as compared to the other parts.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing a brazed eyepiece frame member in which the soldered portion and its vicinity are stronger than other parts.

[Conventional technology]

When a metal eyeglass frame is largely disassembled, it is disassembled into a front frame and a temple, and the two are connected with one hinge screw on each side and assembled into an eyeglass frame. The hinge consists of a pair of hinge pieces and one hinge screw, one of the pair of hinge pieces is soldered to the front frame, and the other is soldered to the temple.

Also, the left and right rims of the front frame are convenient for inserting the lens.
．． YOLfrC17)-shaped 9 are made wa, y,) 9 ends μ are each soldered with blow holes (also called rim locks), and by joining these two blow holes with one screw, rCJ-shaped is made. The rim is closed to hold the lens.

The hinge piece to be soldered to the front frame may be soldered directly to the rim, or to either blow piece, or the end piece may be soldered to the rim or blow piece, and the hinge piece is soldered to this end piece. It may be soldered, or there are various other methods.

Furthermore, the rims are soldered with buffs and watari to connect the left and right rims, pad feet (also called short feet) for attaching pads and 7 dos, and sweat-stop metal fittings for attaching sweat-stops in some cases. solder.

In any case, brazing is indispensable to manufacture metal eyeglass frames, and first of all, various eyeglass frame parts such as rims, bridges, wading, blow tips, endpieces, endpieces, pad feet, sweat-stop metal fittings, and The hinge pieces, temples, etc. are made, and then they are soldered to each other to make "brazed eyepiece frame parts" such as the front frame and temple (with the hinge pieces already soldered), and finally, these are soldered together. They are connected with screws to assemble the eyeglass frame.

[Problem that the invention seeks to solve]

Recently, slim eyeglass frames have become popular, and the disadvantage of deformation and breakage at and near the solder joints of the brazing eyepiece frame members has become more noticeable.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve these drawbacks and provide a brazing eyepiece frame member that will not be deformed or damaged at or near the solder joint, even if it is a slender eyeglass frame member. It's about doing.

[Means for solving problems]

The inventors of the present invention first studied the causes of deformation and damage in the soldered portion and the vicinity thereof, and found that the strength of the soldered portion and the vicinity thereof is insufficient compared to other parts.

As a result of further research, it was discovered that the cause of this problem was that the high heat during brazing softened only the soldered part and its vicinity, reducing its strength.

Therefore, the present inventor focused on age-hardenable "precipitation hardenable metals" and conducted research to find out how to obtain higher strength in the soldered part and its vicinity than in other parts. I proceeded.

Here, "precipitation hardenable metal" means an alloy that becomes hard and strengthened by solution treatment and subsequent aging treatment, and has a narrower meaning than the commonly understood precipitation hardenable metal. Examples of hardenable metals include copper-nickel-manganese alloys such as CuCu-2ONi-20 alloys, copper-nickel-tin alloys such as Cu-2ONi-5Sn alloys, Cu-8Ni-8Sn-2Zn alloys, and age-hardenable aluminum alloys such as JIS A 6000. number and 7
000 series alloys, age-hardening stainless steels such as JI
S G SO5630 series, beryllium copper alloy (Be content is 0.4-4%, LCo outside the copper plate, N1% 51
1% Cr), copper-titanium alloys, cobalt-based spring alloys such as Co-NCo-N1-Cr-alloys.

When this metal is subjected to solution treatment in advance and then subjected to aging treatment, its hardness (which is correlated with strength and serves as a measure of strength) improves.

"Solution treatment" is a heat treatment that turns an alloy into a solid solution and then rapidly cools it into a supersaturated solid solution.To explain this using a copper-nickel-manganese alloy as an example, it is heated to 800℃.
When heated to a high temperature, a soft α phase containing solute components is formed, and when rapidly cooled from that temperature, a supersaturated solid solution is obtained. This heat treatment is called solution treatment.

Then, when the obtained supersaturated solid solution is heat-treated at 200 to 650°C, particularly 400 to 500°C, nickel and manganese compounds are precipitated, and the alloy becomes hard and strengthened. This heat treatment is called aging treatment [or (artificial) age hardening treatment]. In this case, aging treatment in which the alloy is heat treated at a temperature of 1 at which it becomes the hardest is called proper aging treatment, and aging treatment in which heat treatment is performed at a temperature higher than that temperature 0 is called overaging treatment.
Aging treatment in which heat treatment is performed at a temperature lower than temperature 1 is called underageing treatment.

The present inventors have found that the hardness of precipitation hardenable metals is significantly improved when solution treated and then aged, but when cold worked between the solution treatment and the aging treatment, Focusing on the fact that the hardness is further improved compared to when there is no solder, after solution treatment and cold working the entire part, heating the part excluding the soldered part and the area near it to remove the hardening. It was discovered that after aging treatment, the facing part due to cold working disappears in that part, resulting in a "brazed eyepiece frame member" in which the soldered part and its vicinity are stronger than other parts. , we have achieved the present invention.

Therefore, the present invention provides a method for manufacturing a brazing eyepiece frame member by soldering an eyeglass frame member A made of a precipitation hardenable metal and an eyeglass frame member B made of the same or different metal material. Among the members A and B, at least member A is (1) previously subjected to solution treatment as a whole, and then (2)
) Cold work harden the whole part, then (3) heat the parts other than the brazed part and its vicinity to remove work hardening, and then (4) [1] After brazing, aging treatment or ■ Brazing 1, characterized by soldering after aging treatment, in which the soldered part and its vicinity are strengthened compared to other parts! We provide a manufacturing method for mirror frame members.

[Effect]

The precipitation hardenable metal used in the present invention is particularly preferably a "precipitation hardenable metal that does not harden or hardens very little in aging treatment unless cold work hardening is performed after solution treatment." Such metals are, for example, copper-nickel-manganese alloys, such as CuCu-2ONt-20 alloys.

Beryllium copper alloy or age hardening stainless steel such as 5t
Even if the work hardening of lS 631 is removed by heating the parts other than the soldered part and its vicinity, the solution-hardened state remains, so if it is subsequently aged, the hardness will improve, and on the other hand, the soldered part will be hardened. In the area and its vicinity, work hardening is likely to be resolved by heating during soldering, and if it were to be resolved, it would simply be age hardening from the solution state, resulting in the same hardness throughout the soldering process. Care must be taken in this method.

Now, generally, metal eyeglass frame members can be cast directly from raw metal, but this increases the cost, so we obtain raw metal round wire, draw it to a predetermined diameter, and cross-section it. Irregular wire drawing, cutting, bending,
Processes such as pressing, cutting, and drilling are applied to produce *tIi frame member side member rims, bridges, waders, blow tips, end pieces, end pieces, pad feet, sweatproof hardware, hinge pieces, temples, etc. In this case, processing in which work hardening occurs accompanied by plastic deformation is called cold working.

The AI lens frame member A used in the present invention is also manufactured in this manner, and 1! ! ! Mirror frame parts are metal &
Since the fl weave is often unstable, annealing is performed after this. If the strength is insufficient after annealing, it is In this state, it may be annealed and then partially or entirely subjected to normal working (without +11 degree improvement) or cold working (with strength improvement). In this case, the present invention also applies. It is included in the eyeglass frame member A.

The ill lens frame members A and B of the present invention are the above-mentioned @lens frame members, such as rims (those rolled into a circle and rim lines of a predetermined length before being rolled into a circle (referred to as ball rolling) (those having an irregular cross section). ), bridge, watari, endpiece, endpiece, blow end, pad foot, sweatproof hardware, hinge piece, temple, etc. Combinations of A-B include, for example, rim-blow end, rim-end Examples include a hinge piece, a remover 7-piece, a remover bridge, a temple hinge piece, and an endpiece hinge piece.

On the other hand, the 1IslL frame member B may be manufactured from the same raw materials as the W lens frame member A, or may be manufactured by processing the same or different metals using a different or conventional method. Examples of suitable dissimilar metals include nickel silver (Cu-Zn-N
i alloy), stainless steel, nickel-chromium alloy, etc.

(1) In the method of the present invention, of the thus obtained eyeglass frame members A and B, at least member A is subjected to solution treatment as a whole during or after its manufacture.

As a result, the solution-treated part has a Pinkers hardness (
Hereinafter, 1 (referred to as V) decreases once. HV has a positive correlation with strength and serves as a measure of strength.

For example, in the case of a copper-nickel-manganese alloy, it becomes about 1 (V-120) when subjected to solution treatment.

(2) After solution treatment, cold working is performed. In this way, for example, copper nickel manganese is hardened to Hv = 200 to 270 depending on the processing rate of 10 to 60%.

For example, in the case of a linear rim of a predetermined length that is bent into an approximately C-shape (called ball rolling), the eyeglass frame part is subjected to solution treatment and then cold worked to obtain the final desired irregular cross-section. You can also make a ball roll on top of it.

(3) Next, parts other than the brazed part and its vicinity are heated to remove the hardened portion. As a result, the HV of other parts becomes approximately 120 again, but the HV of the soldered portion and its vicinity remains at 200 to 270.

(4) Then ■ After soldering, age treatment or ■
After aging, it is soldered. When a copper-nickel-manganese alloy is used, step (2) is preferred.

As mentioned above, for example, when a copper nickel manganese alloy is heat treated at 200 to 650°C, especially 400 to 500°C, the aging treatment causes precipitation of a compound and hardens and strengthens the alloy.

This improves the hardness, but the hardness is improved more in areas where work hardening has occurred (i.e., the solder joints and the vicinity thereof) than in areas where there has been no work hardening (i.e., other areas). For example, in the case of copper 2.7 Kermanganese alloy, the brazed part and its vicinity vary depending on the temperature and time of aging treatment, but the maximum HV = 44
Improved to about 0. In this case, the part without work hardening is
It does not harden at HV=120 or so.

As a result, a "brazed eyepiece frame member" is obtained in which the soldered portion and its vicinity are stronger than other parts.

The brazing temperature is preferably close to the aging treatment temperature, or at the same level or low temperature as the aging treatment temperature, and at most 100 to 1
The temperature should be 50°C, in which case it is necessary to heat for a short time.

For example, in the case of a copper-nickel-manganese alloy, if it is aged at 500°C for 2 hours, it is preferable to braze it by heating at 600-650°C for 3 seconds or less. Note that welding, particularly spot welding, may be used instead of brazing, depending on the case.

EXAMPLES Hereinafter, the present invention will be specifically explained with reference to Examples, but the present invention is not limited thereto.

(Example 1) Cu: 611%; Ni: 20% by weight; Mn:
φ1 of copper-nickel-manganese alloy consisting of 20% by weight,
Prepare a 5mff1 round wire, heat it to 800°C for 30 minutes, and then solution heat it by cooling it with water to obtain HV = 12.
A wire of 0 was obtained.

The solution-treated wire is subjected to cold deformation drawing process to form the first
h=ln+n, width W-211 with the cross-sectional shape shown in the figure
II11 grooved rim wire. The cold working rate was about 30%, and the entire rim wire was work hardened to HV=240.

This grooved rim wire was cut to a length of approximately 150 mm, and only the other parts, excluding the brazed part and the area near it (near both ends), were heated to 700 to 800°C with a gas burner for 5 minutes.
Work hardening was removed by heating for ~10 seconds and allowing to cool. As a result, the other parts decreased to HV=150. At this time, the area to be soldered and its vicinity is HV
=240.

This rim line is rounded into a circle to form rim 1 (
A type of eyeglass frame member A).

Next, the entire rolled rim 1 was heated to 500° C. for 2 hours for aging treatment. As a result, the brazed portion and the area near it were strengthened to HV=350, but the other parts were hardly strengthened and had HV=150.

Next, at the joint of the rolled rim 1, as shown in Figure 2, length 51M + 11, height 4IIIllI, width 3III
No. 11 nickel silver blown chisel raw material 2 (a type of eyeglass frame member B with a female screw 2a for the rim lock screw, and if this is cut in half at position Y of seam X, it will become a blown chisel) (If you cut it in half from the beginning, it will be difficult to do the "wrinkle" work in the later process) and solder it.

The soldering was carried out by using a limited solder 3 (JIS BAg-1) and heating it to about 620° C. for about 2 seconds by high-frequency induction heating from the blow tip side. However, since the soldered part and its vicinity had already been strengthened to HV=350 by aging treatment at 500°C for 2 hours, the hardness of the soldered part decreased due to the short soldering interval of 2 seconds. was not seen at all.

Next, "wrinkling" was performed in a conventional manner to match the radius of curvature of the eyeglass lens, and the "wax eyepiece frame member" of this example was obtained.

After this, blow the raw material 2 to the position Y of the joint X of the rim 1.
When the ring is opened by cutting the ring, a rim with a blow tip is obtained.

(Example 2) In Example 1, the aging treatment at 500°C for 2 hours was performed at 650°C.
The same procedure was carried out in place of overaging for 2 hours.

However, brazing was performed using JIS BAg-LA as a brazing material at 650° C. for 5 seconds.

As a result, HV = 300 at the soldered part and its vicinity,
Otherwise, an eyeglass frame member having HV=170 was obtained.

In Example 2, the aging treatment is performed at 650° C. for 2 hours at the same temperature as the soldering temperature, so there is no need to particularly shorten the soldering period, which is advantageous for combination with large members.

In Examples 1 and 2, the process of removing work hardening by heating only the parts other than the soldered part and its vicinity (near both ends) is the (a) irregular wire drawing process and step 15.
It may be carried out between the step of cutting into a length of 0.01 or between the step of (b) rolling into a circle and the aging treatment step. In addition to gas burners, heating methods include (a) high-frequency induction heating, (
El) Methods such as current-carrying resistance heating may also be used, especially (b)
) and (a) are preferred in terms of manufacturing.

(Comparative Example) The same procedure as in Example 1 was carried out except that the step of locally heating and removing the cold-work hardened bone was omitted.
We manufactured a wax eyepiece frame member.

As a result, a "brazed eyepiece frame member" was obtained in which the soldered portion, its vicinity, and other parts were equally reinforced to HV=350.

(Rim failure test) The ``rim 1 soldered with blown ji raw material 2'' produced in each example and comparative example 1 was tested as shown in Fig. 3.
Stand it vertically so that it is on the side, then fix the blown chi raw material 2, apply a load in the horizontal direction (two directions) to the farthest position (point a) from the blown chi raw material 2, and then bend it in the reverse direction. The process of applying a load in one direction and bending in the opposite direction was repeated. The load was applied so that the displacement was ±4.5 m+a at the load point (point a), and the load was repeated at a rate of 120 minutes per minute. This repeated deflection test was continued until the rim broke, and the number of repetitions until the rim broke was determined.

In both cases, rim 1 broke near the soldered part.

(Summary) The processing conditions, hardness, and rim failure test results in Examples 1 to 2 and Comparative Example 1 are summarized in Table 1 below.

In addition, ■ in Table 1 represents the soldered part and its vicinity, and ■
indicates other parts, HV when ■ or ■ is not displayed
represents the overall hardness.

(Effects of the Invention) As described above, according to the present invention, a precipitation hardenable metal is used, and after the entire body is previously solution-treated and cold-work hardened, a Since only the parts are heat-treated to eliminate work-hardened bones and then subjected to aging treatment, the "welded parts and their vicinity" are relatively strengthened than other parts, reducing the risk of deformation and breakage there. do.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the grooved rim wire used in the example. FIG. 2 is a partial perspective view showing a state in which the rim used in the example was rolled up and a blown chimney raw material was placed on the seam thereof. FIG. 3 is a schematic perspective view illustrating the state of the rim break test. [Explanation of symbols of main parts] 1.-- Rim (an example of eyeglass frame member A)
2・・・・・・−・Blow chi raw material (an example of B) Y
Cutting at the position will result in a pair of blow tips 2a...-1-~-Threaded holes for rim lock screws 3--
・−・−・Silver solder 4−−−−−1…−Lens

Claims (1)

[Claims] A method for manufacturing a brazed eyepiece frame member by brazing an eyeglass frame member A made of a precipitation hardenable metal and an eyeglass frame member B made of the same or different metal material. Of the members A and B, at least member A is (1) previously subjected to solution treatment in its entirety, then (2) cold work hardened in its entirety, and then (3) other than the brazed portion and its vicinity. Heat the part to remove work hardening, then (4) [1] After brazing, age-treat the part, or [2]
] A method for manufacturing a brazed eyepiece frame member, which is characterized by performing aging treatment and then soldering, in which the brazed part and its vicinity are strengthened compared to other parts.