Anodized Aluminum Laser Black Marking By Mopa Fiber Laser Marking Machine

In actual processing, mopa laser marking machine is used to black mark the surface of anodized aluminum material for product identification, anti-counterfeiting, statistics and traceability

The principle is as follows: irradiate the surface of the material with a high-energy-density laser to further oxidize the surface oxide with a film thickness of 5um-20um in a short time and change the surface material mechanism. Based on the nano effect, under the action of the laser, the size of the oxide particles is at the nanometer level, and the light absorption of such a substance increases, so that the visible light is irradiated by the substance and is absorbed, and the reflected visible light is very little, so it is black when observed by the naked eye, which is physical processing. , can not be altered, has a strong anti-counterfeiting performance.

Factors Affecting Blackening of Anodized Aluminum Surface

1. The film thickness of the oxide layer of anodized aluminum: the film thickness is 5-20um. The film thickness directly determines the effect and efficiency of blackening. Generally, it is easier to blacken when the film thickness is 10-20um. When the film thickness is less than 8um, the oxide film is too thick. Thin, easy to break, and white spots appear, it is necessary to increase the pulse frequency and increase the filling density;

2. Material surface technology: Sandblasting and surface drawing are common processes. The thickness of sandblasting will have different effects on the marking effect. The finer the sandblasting particles, the better the blackening effect;

3. Installation and commissioning of the mopa fiber laser marking machine: the optical axis of the incident spot of the laser overlaps with the optical axis of the laser entrance of the vibrating mirror, and the exit spot is located at the center of the exit hole. The deviation of the optical path will directly lead to uneven blackening; the setting of laser parameters will directly affect the quality and effect of anodic aluminum blackening. The main laser parameters are power setting and frequency setting. The higher the frequency, the shorter the pulse width, and the required power also higher;

4. Blackening process: the focal length of the field mirror, the size of the spot, the filling method, whether it is in focus or out of focus, etc. The most important thing is the setting relationship between the filling density and the linear velocity of the galvanometer

The most important thing is that you need a mopa fiber laser marking machine with adjustable pulse width