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How to use laser focusing lens correctly

2021-01-14 19:04:29

Focusing mirror is one of the core accessories of laser equipment such as fiber laser engraving machine and cutting machine, marking machine, welding machine and so on. The function is to form a uniform focus point on the entire standard plane. Its main performance indicators are: focal length and scanning range. The focal position depends on both the focal length and the deflection angle; the scanning range is proportional to the focal length of the scene. After focusing, The spot diameter is proportional to the focal length, that is, when the scanning area reaches a certain level, the larger the spot diameter is.

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The focusing mirror is an optical element that can compress the diverging laser light in an angular direction. Due to the large emission surface of the optical fiber, it is a diffused beam rather than a collimated or focused spot. The fiber laser focusing mirror can effectively converge the light beams at the end of the fiber, and control the output light beam in a small area. According to the requirements of different applications, two or more focusing lenses can be used, and this kind of optical element is called a compound focusing lens, and sometimes an aspherical focusing lens is used. From the perspective of the use effect, the aspherical surface has the best effect , Followed by the compound focusing lens.

The working environment of the focusing lens of a laser cutting machine can also be said to be very harsh. It is affected by smoke and slag during cutting, and dust is easy to adhere to the focusing lens. When the mirror surface is dirty, the light transmittance of the focusing lens becomes lower and the heat absorption becomes higher. If the cleaning work is not done well, the lens will become easy to burst. How can the service life of the focusing lens be extended?

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Generally, in the laser-sealed optical path, dry, oil-free, and dust-free positive pressure air is used to ensure that dust and impurities in the atmosphere cannot enter the optical path, so as to prevent the pollution of the optical lens;

If it is a super high-speed piercing, you can spray piercing oil before piercing, so that the slag will not fall to the torch part vertically, but to the side. Thereby reducing the damage to the lens;

The waste residue generated during the operation of the laser cutting machine causes the auxiliary air to blow down from the cutting nozzle, thereby greatly reducing the damage to the lower part of the focusing lens by the waste residue;

Minimize the use of ultra-high-speed perforations, and use conventional perforations to extend the life of the focusing lens.

Generally, the focusing lens is cleaned and maintained every time before starting work. When cleaning the focusing lens of a fiber laser cutting machine, clean wipes and optical-grade solvents are often used to prevent damage by other contaminants. The wipe paper must be moistened with a suitable solvent and never used dry. In consideration of softness, the usable wipes are pure cotton Webril wipes or applicators such as cotton balls, lens tissues, and cotton swabs.

In addition to the nozzle, the focusing lens is the closest accessory to the processing surface when the laser cutting machine is working. Although the focusing lens is a very small part, it is one of the core components of the laser cutting machine and affects the processing of the laser cutting machine. Efficiency and quality.