Demystifying the gasification cutting method of laser cutting machine

by:Caodahai     2021-09-05
We have talked about the melting and cutting method of laser cutting machine before, I believe everyone also has a certain understanding of the melting and cutting method. And as a cutting method that is also popular for laser cutting machines—gasification cutting method, how much do you know about you? Let’s analyze it for you next.   The gasification cutting method of laser cutting machine is that when several high power density is irradiated to the surface of the workpiece, the material is heated to the vaporization point in a very short time, and part of the material is turned into steam and escapes to form a slit. We can learn in detail from the following aspects:    1. The laser beam irradiates the surface of the workpiece, part of the beam energy is reflected, and the remaining part is searched for by the material. The reflectivity decreases as the surface continues to heat up.  2. The speed at which the surface temperature of the workpiece rises to the boiling point temperature of the material is very fast, enough to avoid melting caused by heat conduction. 3. The steam is quickly selected from the surface of the workpiece at near sonic speed, and its accelerating force generates a stress wave inside the material. When the power density is greater than 109W/cm2, the reflection in the stress wave material will cause the brittle material to rupture, and it will also increase evaporation. The front pressure increases the vaporization temperature.  4. The steam takes away the molten particles and scouring debris, forming holes. During the vaporization process, 60% of the material is driven out in the form of droplets.   5. When the power density is greater than 108W/cm2, a stress field similar to a point load is formed, and the standing wave is reflected inside the material.   6. If overheating occurs, the hot vapor from the hole will reflect and absorb the incident laser beam due to the high electron density. There is an optimal power density. For stainless steel, the value is 5X108W/cm2. Above this value, the vapor absorption blocks the increased power, and the absorption wave starts to move away from the surface of the workpiece toward the beam direction.  7. For some materials that are partially permeable to the beam, heat is absorbed internally, and internal boiling occurs at the evaporation front, expelling the material as an explosion below the surface.   Wuhan Gaoneng Laser Equipment Manufacturing Co., Ltd. is a high-tech enterprise integrating Ru0026D, production and sales of professional laser complete sets of equipment. Not only successfully developed laser equipment with advanced technology, but also used self-support import and export rights to promote products to more than 40 global markets including Hong Kong, South Korea, Vietnam, Malaysia, Thailand, Australia, the United States, Japan, Germany, the Netherlands, Jordan, etc. nation.
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