Correct cleaning method for protective lens of laser cutting machine

There are many kinds of lenses used in the laser cutting machine, such as focusing lenses, protective lenses, etc., which will inevitably be polluted during the working process, such as water pollution or dust pollution, so it is necessary to clean the laser lens during the daily maintenance process to ensure the stability of the laser cutting machine. Of course, cleaning lenses is not the same as cleaning glasses in our life, which requires special attention. This article explains the correct cleaning method of laser lenses in laser cutting machines. In the process of cleaning lenses, the main purpose is to remove the pollutants from the lenses and do not cause further pollution and damage to the lenses. In order to achieve this goal, people should often adopt the method with relatively low risk.

Tools and chemical materials:

1. Anhydrous CH3COCH3
2. Water-free cotton swab
3. High pressure gas
4. Tape

Methods and steps:

1. First, use the air ball to blow off the floating objects on the surface of the element, especially the lenses with tiny particles and dirt on the surface. This step is necessary. But do not use the compressed air on the production line, because these air will contain oil and water droplets, which will deepen the pollution of the lens.

2. Clean the lens slightly with CH3COCH3. This level of CH3COCH3 is almost anhydrous, which reduces the possibility of lens contamination. When the cotton ball is dipped in CH3COCH3, the lens must be cleaned under light and moved in a circular way. Once the cotton swab is dirty, it must be replaced. The cleaning shall be completed at one time to avoid the generation of ripple. (If the lens has two coated surfaces, such as a lens, each surface needs to be cleaned in this way. One side needs to be placed on a layer of clean lens paper for protection.)

3. If CH3COCH3 cannot remove all dirt, then use acid vinegar to clean. Acid and vinegar cleaning is used to remove dirt by dissolving it, but it will not cause damage to optical lenses. This sour vinegar can be experimental grade (diluted to 50% strength), or domestic white vinegar with 6% acetic acid can also be used. The cleaning procedure is the same as that of CH3COCH3, and then use CH3COCH3 to remove acid and vinegar and dry the lens. At this time, frequently change the cotton ball to completely absorb the acid and hydrate.

matters needing attention

(Note: Only pure paper stick cotton swabs can be used. Only high-quality medical cotton balls that have been selected and do not contain any abrasives can be used.) Of course, certain pollutants and lens damage can not be removed by cleaning, especially the film burning caused by metal splash and dirt. The main way to restore good performance is to replace the lens. Correct installation method In the installation process, if the method is not correct, the lens will be contaminated. Therefore, the operation regulations mentioned earlier should be followed. If a large number of lenses need to be installed and removed, it is necessary to design a fixture to complete the task. The special fixture can reduce the number of contact with the lens, thus reducing the risk of lens pollution or damage. In addition, if the lens is installed incorrectly, the laser system will not work properly, or even be damaged. All carbon dioxide laser lenses should be installed in a certain direction. Therefore, the user should confirm the correct direction of the lens. The reflector is the third commonly used lens, and its installation is also very critical. Of course, it is easy to distinguish the reflecting surface from the reflecting mirror. Obviously, the coated side is facing the laser. In general, the manufacturer will mark the edges to help identify the surface. Generally, this mark is an arrow, with the arrow facing one side. Every lens manufacturer has a system for lens marking. Generally speaking, for the reflector and output mirror, the arrow points to the high reverse side. For the lens, the arrow points at the concave or flat surface. Sometimes, the lens label will remind the meaning of the mark. When the lens is properly cleaned and operated, its service life and performance will undoubtedly be significantly improved, which is also one of the important ways to improve the service life and stability of the laser cutting machine. Taking some preventive and maintenance measures will ensure that the laser cutting machine works longer and has higher stability.


Hanzhong Brisun Optics Co., Ltd. Is the high precision optical element manufacturer provides customized production of Various optical lenses, including spherical lens, cylindrical lens, optical window, mirror, prism, filter, metal base mirror and other high-precision optical elements. The base materials include various optical glass, fused quartz, calcium fluoride (CaF2), zinc selenide (ZnSe), germanium (GE), silicon (SI), sapphire, metal and other materials. And provide antireflective film, high reflection film, spectroscopic film, metal film and other optical coatings.

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