JPS6247618A - Manufacture of spectacles - Google Patents

Abstract

PURPOSE:To obtain strong spectacles by sectioning groove parts for mounting a rim on a bridge made of Ti and joining them together, and pressing an electrode and brazing it by using a brazing filler metal containing Ti while flowing a specific current for resistance brazing. CONSTITUTION:The groove parts 22 for fitting and welding the curved rim are sectioned as shown by chain lines. When those grooves 24 are sectioned, a cutting tool 24 is rotated at a high speed to form them with the tip 26 of the cutting tool 24. When the cutting tool 24 is rotated to a radius of curvature equal to the curvature of the curved shape of the rim, the rim and bridge 20 are jointed together with a small gap. Then, the brazing filler metal is spread to the gap part. This bridge 20 is fitted and fixed in the groove 31 of one electrode 30, the rim 28 is positioned at the groove part 22 of the bridge 20, and the other electrode 30b is lowered; and the specific current for brazing is flowed to braze the electrode by using the brazing filler metal 32 of pure Ti in a thin plate shape.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing eyeglasses, and more particularly, the present invention relates to a method for manufacturing eyeglasses, and more particularly, a rim for supporting eyeglass lenses and a bridge for holding the rims by being bridged between the rims are made of pure titanium or a titanium alloy. The rim and the bridge are bonded and fixed by applying a predetermined resistance brazing current to the joint part to heat it and supplying a titanium-containing brazing material to the part to join and fix the rim and bridge. The present invention relates to a method of manufacturing eyeglasses for obtaining frames.

As shown in FIG. 1, the eyeglass frame is composed of various parts such as a temple 2, a brooch 4, a hinge 6, a rim 8, and a bridge 10. Therefore, when assembling the eyeglass frame 12, , these various parts must be joined. Rim 8 that holds spectacle lens 14
．． Brooch 4.4 for attaching 8 and temple 2.2
, or the rim 8.8 and the bridge 10 bridged between them are no exception to this. In this case, various welding methods have conventionally been used when joining the various parts that make up the eyeglass frame 12.

Incidentally, in recent years, methods of manufacturing eyeglass frames using metals containing titanium have become widespread. In particular, if the eyeglass frames are made of 100% titanium or close to titanium, composite titanium frames containing cladding materials are also suitable because they can further reduce the weight, and the rigidity can be further increased, so the strength can be improved. The reason for this is that they are much better than conventional eyeglass frames.

Therefore, when attempting to bond titanium eyeglass frames by applying a high-frequency current, the joining portion of the eyeglass frames must be heated to approximately 1000°C. However, if the temperature exceeds this temperature, titanium itself becomes nitrided and becomes brittle, and the eyeglass frame itself becomes deformed. Moreover, since this temperature is generally determined by the luminescent color of the bonded portion which changes depending on the heating temperature, temperature control is difficult and the quality cannot be guaranteed. Furthermore,
This high frequency welding requires considerable skill.

Therefore, attention has been paid to the fact that the rim 8, bridge 10, etc. are all made as small as possible, and attempts have been made to use resistance welding to join these relatively small parts all at once. .

However, when attempting to integrally join the rim 8 and the bridge 10, an extremely large welding current is required, which damages the surface of the welding base material, resulting in a disadvantage that it cannot be used practically. are doing.

SUMMARY OF THE INVENTION The present invention has been made to overcome the various disadvantages described above, and includes forming a groove in a titanium-containing bridge for receiving a rim, joining the bridge to the rim, and connecting the bridge to the rim. While applying a predetermined resistance brazing current with the electrodes in pressure contact from both sides, a titanium brazing filler metal made of the same material is supplied, and the joining portions of the bridge and rim are spot-brazed to connect the bridge and rim. The object of the present invention is to provide a method for manufacturing eyeglasses that joins together.

To achieve the above object, the present invention positions a titanium-containing bridge in correspondence with a titanium-containing rim for carrying a spectacle lens, and positions a part of the rim in a groove defined in the bridge. Then, an electrode is pressed into contact with the bridge and the rim, and a resistance brazing current is applied to the joint portion between the bridge and the rim for a predetermined period of time, and a welding material containing titanium is supplied to the joint portion. It is characterized by spot brazing the bridge and rim.

Next, preferred embodiments of the method for manufacturing eyeglasses according to the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 3, reference numeral 20 indicates a bridge constituting the eyeglass frame. This bridge 20 is defined with a groove 22 as shown by chain lines in the figure in order to fit and weld the curved rim. When defining this groove portion 22, a cutting tool 24 is preferably used, and by rotating this cutting tool 24 at high speed via a rotational drive source (not shown), a tip 26 fixed to the tip of the cutting tool 24 is inserted. The groove portion 22 is thus formed. In this case, when the rim, which will be described later, is configured to have a curved shape, if the cutting tool 24 is attached to a rotational drive source so as to rotate with the same radius of curvature as the rim, the rim and the bridge 24 can be This is suitable because the gap is small and the brazing filler metal can sufficiently cover the gap when bonding with the metal. Therefore, the bridge 20 in which the groove portion 22 is defined as described above is connected to one electrode 30.
Position and fix at point a. In this case, the electrode 30a has a fitting groove 31 of the bridge 20, as shown in FIG.
is formed, and the bridge 20 is automatically or manually positioned in this fitting groove 31.

The rim 28 is then positioned in the groove 22 of the bridge 20. This positioning may also be automatic or manual.

When the workpiece is positioned in this way, the electrode 30b is lowered under the action of an actuator (not shown), and the rim 2
8. Press the predetermined position. As a result, the bridge 20 and the rim 28 are sandwiched between the electrodes 30a and 30b.

Therefore, if a predetermined resistance brazing current is passed from one electrode 30b to the other electrode 30a while pressing the bridge 20 and rim 28 with a predetermined pressure, this current will be applied to the bridge 20 and the rim. It flows to 28 joint sites. In this case, since a current flows between the electrodes 30a and 30b, the current flows in a concentrated manner at the joint between the bridge 20 and the rim 28, and this joint is heated intensively. When a brazing material 32 made of, for example, pure titanium in the form of a thin plate is brought into contact with the heating section, the brazing material 32 melts and the bridge 20 and the rim 28 are reliably welded. That is, in the groove portion 22, the brazing material flows around the narrow gap defined between the bridge 20 and the rim 28 by capillary action, and firmly joins the two after a predetermined cooling period.

By the way, the bridge 20 brazed in this way
The bridge 20 and the rim 28 do not soften or deform (have suitable strength).In other words, the bridge 20 and the rim 28 are spot-brazed by the electrodes 3Qa and 30b, so the heated area is considerably heated. Concentrate on a narrow area.

Therefore, the heating effect is applied only to a predetermined region, while other regions do not become extremely hot. This situation is shown in FIG. In this case, a welded layer 34 with a coarse structure is formed at the joint portion between the bridge 20 and the rim 28. Although this welding layer 34 is a softened tissue, as can be easily understood from the figure, it does not spread to any extent in the area away from the joining area on the bridge 20 and rim 28 sides.
The strength of the bridge 20 and rim 28 is not reduced.

Furthermore, since the softened weld layer 34 is formed, it is confirmed that the bridge 20 and the rim 28 are reliably welded.

As described above, according to the present invention, a groove for attaching a rim to a bridging plate made of titanium is defined and these are joined together, and then electrodes are pressure-welded and a predetermined resistance brazing current is applied. However, brazing is performed using a brazing material containing titanium to integrate the bridge and rim. Therefore, unlike conventional brazing, there is no need to control the temperature while watching the color of the heated brazing material.
Furthermore, excess brazing material generated during brazing will not leak out and spoil the aesthetic appearance of the eyeglass frame after the product is completed. Furthermore, since spot brazing is performed using resistance brazing current, the bridge and rim are not melted more than necessary, ensuring good strength and making it possible to provide high quality eyeglass frames. Become.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to the above-mentioned embodiments. For example, the groove portion of the bridge may be formed using a different process instead of using a cutting tool. Of course, various improvements and changes in design are possible without departing from the gist of the present invention.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view showing a state in which an eyeglass frame and a lens attached to the eyeglass frame are connected, and FIG. 2 is a partially omitted perspective explanatory view showing a state in which a rim and a bridge of a spectacle frame according to the prior art are connected. , Fig. 3 is a perspective view of the bridge according to the present invention before cutting, Fig. 4 is a perspective explanatory view when brazing the bridge and rim, and Fig. 5 is a partial cross section of brazing the bridge and rim. The explanatory drawing, FIG. 6, is a partially omitted cross-sectional explanatory view showing a welded state after the bridge and the rim are brazed.

Claims (1)

[Claims] (1) Position a titanium-containing rim corresponding to a titanium-containing rim for supporting a spectacle lens, bring a part of the rim into contact with a groove defined in the bridge, and then An electrode is pressure-contacted to the rim, and a resistance brazing current is applied to the joint between the bridge and the rim for a predetermined period of time, and a welding material containing titanium is supplied to the joint to spot-braze the bridge and the rim. A method of manufacturing glasses characterized by: