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4.2 Light route maintenance
The light route system of the laser cutting machine consists of the reflection of the reflector and focusing of
the focus lens. The focus lens doesn’t have offset problem in the light route. However, the light route may offset
after a long period of work or due to mechanical vibration. Although the reflector will not offset when the
machine is under normal use, it is recommended that the user shall check whether the light route is normal each
time before the machine is working.
Proper and regular maintenance of the optical system can effectively extend the life of the laser generator
and reduce the cost of the lens.
During replacement, pay attention to placing, testing, installing the optical lens to keep it free of damage and
pollution. After installing a new lens, regular cleaning is needed. This is very simple. Proper operation will prolong
lifespan of the lens and lower cost. Otherwise, the lifespan will be shortened.
During laser working, it is inevitable to prevent the optical parts from contacting the suspended particles.
When cutting the materials, engraving and marking with laser, processing surface will release plenty of gas and
flying objects. The gas and flying objects may cause harm to the lens. When dirt falls on surface of the lens, it will
absorb energy from the laser beam causing thermal-lens effect. In case of no thermal stress formed on the lens,
the operator may take it down and clean it. Of course, a certain method capable of avoiding damage and further
pollution should be applied.
General rules of operation
During cleaning and installing the lens, any matter stuck on or even nail print or oil droplet may higher
absorption of the lens and shorten lifespan of it. Therefore, the following prevention measures must be taken:
1) Suction or blowing device are prohibited to avoid scratch on surface of the lens caused;
2) Do not touch film layer of the lens when taking it out, but to hold its edge;
3) Keep the lens at dry and clean place for testing and cleaning. A good working table should be equipped
with several layers of cleaning paper or lens cotton paper on the surface;
4) The operator shall not speak over the lens, and keep food, beverage and other pollution matter with
potential risk away from the working environment.
Correct leaning method
During cleaning the lens, the only objective is to remove pollution on the lens, but not cause further pollution
and damage to the lens. To achieve this goal, people usually take the method with less risk. The followings are just
for this purpose:
Firstly, use air balloon to blow off particles on surface of the lens, especially the micro particles and floccules
on the lens. This is a necessary step. Yet, compressed air of the production line is strictly prohibited. This is
because the air from it contains oil and moister, and that will cause further pollution to the lens.
Secondly, gently clean the lens with acetone or absolute alcohol (Absolute alcohol is necessary. It may lower
the possibility of pollution to the lens.)
After soaking acetone, use the lens paper to clean the lens under sunshine and move in a circle. When the
paper gets dirty, it is ma must to replace it. Cleaning must be done in a one-off way to avoid scratch caused.
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