Quality control points of metal eyewear

22-09-08 11:56:01    By Bestsea eyewear

Metal eyewear are one of the most common types of eyewear at present. In terms of materials, in addition to common metal glasses, there are titanium eyewear and aluminum eyewear.This article mainly talks about how to control the quality of metal eyewear in the production process. After a series of processes such as material selection, accessory production, welding, grinding, and electroplating, metal eyewear use the surface color to achieve a certain brightness, which is very beautiful to wear. In general, the advantages of metal eyewear are firm, light, beautiful, and good shape. The metal eyewear frame basically has nose pads, and the nose pads can be moved on one side to adapt to various nose shapes. However, for the same glasses, the difference in quality will give people a very different feeling. Only high-quality eyewear can bring a sense of beauty to people and can also protect your eyes well. Here, let's take a look at the quality control points of metal eyewear.

metal clip on frame

1. Parts quality control. The quality of accessories directly affects the quality of finished eyewear. This includes factors such as raw materials, molds, drawings and so on.
A. Mold. The quality of the mold is very critical, including copper molds. Especially for shelves with pictures and texts on the surface, or light-colored shelves, it is more important. For example, the quality of the parts factory of A is high and stable, and the mold fee is higher than the general one. What is the problem, why is the mold fee expensive? Where is the good?
eyewear mold
Mold
B. Precision of the mold. Especially for the concave surface, it cannot be polished and rolled in the later stage. Whether the saving is good or not will directly affect the effect. How to judge? After pressing out, look at the roughness of the concave surface.
C. Material handling. For example, it is very important to rough-grind the material first, and then hydraulically. Especially for accessories with a concave effect. Even for ordinary wire cutting, if the material can be pre-treated, it will be of great help to the post-process.
D. Materials. The material affects the hardness, elasticity and finish of the fitting. Therefore, it is best to confirm the materials in advance, such as stainless steel, brand (imported and domestic), density, purity, etc., which sometimes have a great impact.
E. Drawings. Functional, structural, risk assessment is important. Don't make it, only to find that it's a little soft, the elasticity is not enough, the place is too rough, etc., and there is no evaluation in these aspects in advance. In addition, it is important to mark some key quality points. In addition, because many processes are completed by machines, the drawing requirements are very fine.
2. The standard eye core model. This is related to whether the rims of metal eyewear are standard. The standard metal ring will not only make the eyewear look more beautiful, but also help reduce after-sales troubles.
A. Metal circle copy number. For customers with stricter specifications, the number must be copied to ensure that the perimeter of each coil is the same.
B. Eye nucleus model practice. Wire cut metal eyewear mold. The advantage is that the specifications are standard and not deformed. The usual practice in general factories is to carve a plastic eyeglass mold or make it by hand. The disadvantage is that it is easy to deform and not so accurate.
C. Eye nucleus model. As a detection tool when winding. At the same time, the metal eye core model is not easily deformed and worn for a long time, and can be used for many times for a long time to ensure the stability of each time.
D. Special biased eye core model. It is suitable for the traditional manual turning method. The center point of the traditional glasses is taken at the intersection of the middle line of the AB position, but if it is found that the center point is too large (more than 10mm) from one side of the lens than the other side, the balanced center point method should be considered (refer to the car section for details). The molds and drawings should be clearly marked, so that the corresponding method will be adopted when turning the pieces.
E. Metal circle detection. Eye nuclear mold inspection, or with a concave inspection mold. The number of copies can only ensure that the perimeter of the coil is consistent. For deformation, etc. that cannot follow the drawings, a detection die must be used. Such as eye nuclear mold detection, or concave mold detection. First of all, when winding the ring, the winding factory should be called to use the standard wire-cut metal glasses mold as the detection standard; secondly, after the mirror is circled back, the concave mold should be used for sampling inspection, and then whether the sampling inspection should be fully inspected.
3. Welding fixed mold. At the same time, it is also the detection mode for rim and end piece.
Metal glasses welding
Metal glasses welding
A. Middle bridge welding. All middle bridge and top bar are welded using this fixed mold.
B. End piece detection. When debugging the welding fixture, it is used as a test. Welding of bulk goods is not carried out until they pass the test. It should be noted that because the slot of the detection mold is larger than that of the end piece, after the shelf is put on, the end piece cannot be biased to the side (the iron sheet control method can be used. That is, the margin left for each end piece is the same. For example, the two sides are exactly 2mm after putting it on, then make a 1mm iron piece. After the shelf is put in, the iron piece can just be inserted into the gap between the end piece and the detection mold.
C. Metal rim detection. Used for metal rim detection. Refer to point 2 of C "Eye nucleus model".
4. Milling the lens. The order of priority in terms of quality is as follows (the first three points are basic items):
cutting lenses
Cutting lenses
 A. Face up: no light, no white leakage (ie, the edge of the knife). It is absolutely impossible for these two situations to occur. The simple test method is: 1) Look at the light (white background) to visually check whether there is light transmission and whether there is whiteness; 2) Use your fingernail (try to be the tail fingernail, which is relatively thin) and turn it diagonally inward. If you feel any sudden resistance, If you look closely, it should be white or transparent with a high probability.
B. If the first point is satisfied, be a little looser. The simple test method is: 1) Pinch the middle beam and shake it with a certain amount of force, and the lens will not loosen; 2) Pinch it with three parts of force and do not move.
C. No shrapnel. The simple test method is: 1) Hold the second temple to about 130 degrees out without shrapnel or fall off; 2) Use your finger to top the edge, and it will pop out with about three parts of force, that is, it is too loose. considered normal.
D. Stress control scale. In the case of ensuring the first point, the three parts of the force are not loose (refer to the second point) and the three parts of the force are a little loose under the condition that the three parts of the force do not resist the shrapnel (refer to the third point).
E. For the pieces with large eccentric gaps (conventional cross positioning method), compare the largest two to three center distances. If it exceeds 10mm, a special eye core model should be used by the circumscribed method (circular circumcision method: use a circle Try to cut the two or three farthest points of the lens, and then make fine adjustments to find the center point). If it is a computer car film, you don't need to consider this.
F. Note for wide flat edge pieces. When one side of the mirror ring is relatively wide and normal (normally more than 30mm), the radian of the lens on the same side should be slightly larger than the radian on the same side of the ring (for example, the middle point is about 15 wires higher) to avoid shrapnel (Otherwise, it is easy to shrapnel with a finger to the side in the middle).
G. Poly lens (polarizer) precautions. 1) Positioning of the car piece: when it is flat, the light is a little darker, and when it is turned clockwise to a 45-degree angle, it is basically completely black. 2) Simple test stress and positioning: open the blank WORD file on the computer, pinch the two sides of the glasses with the polarizers installed against the WORD file, and turn clockwise, from flat to 45 degrees until one turn. 3) Stress is more important for polarizers, so on the premise of ensuring points 1, 2, and 3, it can be considered to be looser to reduce stress, and there should be no stress light transmission phenomenon in blocks and sheets.
H. The V-shaped offset ratio is applicable. The circle shape is generally 110 degrees, and the turning knife is generally 110 degrees. The ratio is generally 3/7 points, which is more appropriate, and the periphery should be as consistent as possible. Too much weight in the front means that the front is easy to show white, and too much weight at the back means that the front is swollen and the back is too white.
5. Windsor ring metal eyewear frame quality control.
A. The welding position is accurate. This is a very crucial point. How to control? Refer to (3) Mirror circle control and (4) Middle beam welding and end piece inspection of the welding real mold.
B. Windsor glue carving is accurate. After being put on the ring, the gap in each place is within the acceptable range (within 0.5mm).
C. Tie together to be tight. After the glue is applied, it is tightly closed by hand, and then baked to shrink it. There can be no virtual post bulge (surface causes uneven thickness).
D, chrome cut three-dimensional. When cutting the chrome, be careful not to make the chrome beveled, and try to make the cut surface at a 90-degree angle with the ring surface (otherwise, it will look like there will be a missing piece visually).
E. Windsor glue joint. This is the most easily tilted side, so pay special attention.
6. Electroplating quality control.
Electroplated metal rim
Electroplated metal rim
A. Anti-sweat and salt spray test. 1) Method 1: The electroplating factory is required to use imported electric pulse glue. The factory guarantees that it can last for 65 hours. After testing, it can reach more than 60 hours.  2) Method 2: After adding glue to the electric pulse, add glue once, and it can last for 72 hours, but the cost will increase by 2 yuan, and there may be a slight glue accumulation on the surface. This method is not currently used.
B. Two-color electroplating. Two-color plating. The metal on a pair of metal spectacle frames has at least 2 or more plating colors. The commonly used method is to spray color or drip oil locally after electroplating. In the case of optional, try to choose the color spray process, the adhesion will be better.
C. Laser effect control. Generally divided into shallow laser and deep laser. If there are more and smaller fonts, generally only shallow lasers can be used, so that the fonts will be clearer. If the fonts are small and large, deep laser can be used before electroplating, lightly tossed after the laser, and then electroplated, so that the fonts have a longer service life.
The above are some of the quality control points of metal eyewear. Of course, to make a pair of metal eyewear frame, there are still many places to pay attention to. You must pay attention to every detail in the production process in order to make high-quality eyewear.

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