Principle of Laser Cutting Machine
Laser is a kind of light, which, like other natural light, is produced by atom (molecule or ion, etc.) transition. However, unlike ordinary light, laser depends on spontaneous emission only in the initial very www.shusongdaii.cn www.qieduanji.com.cn www.luyuanshimoju.cn www.luyanshimoju.org.cn www.suliaomoju.org.cn www.gelidunmoju.org.cnshort time, and the subsequent process is completely determined by stimulated radiation. Therefore, laser has very pure color, almost no divergence direction, extremely high luminous intensity and high coherence.
Laser cutting is realized by using high power density energy produced by laser focusing. Under the control of computer, the laser is discharged by pulse, and the controlled repetitive high frequency pulsed laser is output to form a beam with a certain frequency and pulse width. The pulsed laser beam is transmitted and reflected through the optical path and focused on the surface of the processed object through the focusing lens group, forming a fine, high energy density spot near the surface to be processed. The material is processed by instantaneous melting or gasification at high temperature. Every high-energy laser pulse instantaneously splashes a small hole on the surface of the object. Under the control of computer, the laser processing head and the processed material move continuously and relative to each other according to the pre-drawn figure, so that the object can be processed into the desired shape.
The process parameters (cutting speed, laser power, gas pressure, etc.) and trajectory of slit cutting are controlled by numerical control system. The slag at the slit is blown away by auxiliary gas under certain pressure.