Nowadays, laser cutting machines have been widely used in various industries, especially sheet metal processing and manufacturing industries. Because the laser cutting machine has many advantages in cutting stainless steel plates, it greatly improves the efficiency and thickness of cutting. Everyone knows that the cutting quality of a laser cutting machine depends on many factors, and the amount of defocus is an important parameter that affects the cutting quality in the laser cutting process. Today, Leapion Laser will analyze. What is the relationship between the defocus amount of the laser cutting machine when cutting stainless steel plates and the dross and burrs appearing in the cutting?
What is the amount of defocus?
The amount of defocus is an important parameter that affects the cutting quality during the laser cutting process. In the non-oxidized cutting of stainless steel plates, blowing away the molten metal with auxiliary gas is very important to reduce the amount of slag and improve the cutting quality. Therefore, it is necessary to The focus position is set inside the steel plate to expand the width of the cut to increase the flow of auxiliary gas. The actual production experience also proved that in the non-oxidation cutting process of the stainless steel plate, the focus position is set to the inside of the steel plate, and good processing quality can be obtained.
What are the different effects on cutting stainless steel plates when the laser cutting machine chooses different defocusing amounts?
1. When the focus position is appropriate, the cutting material melts, but the material near the cutting edge is not melted, the slag is blown away, forming a slag-free, smooth cutting seam.
2. When the focus position lags behind, the energy absorbed per unit area of the lower part of the cutting material is reduced, and the cutting energy is weakened, resulting in that the material cannot be completely melted and blown away by the auxiliary gas, so that the incompletely melted material adheres to the lower surface of the cutting plate.
3. When the focus position is advanced, the average energy absorbed per unit area of the lower half of the cutting material increases, causing the cut material and the material near the cutting edge to melt and become liquid flowing. At this time, due to the auxiliary air pressure and cutting At the same speed, the molten material adheres to the lower surface of the material in a spherical shape and forms slag.
In actual production, the focus of laser cutting stainless steel plate is required to be selected on or below the surface of the material. This is because the width of the upper part of the cutting groove is enlarged, the fluidity of the gas and the melt is improved, and the smooth section of the section is enlarged, and the cutting quality is improved.
During the cutting process, there is no definite value for the focus position for steel plates of different thicknesses. When the focus position is on or above the surface of the steel plate, due to the low average power density at the lower part of the steel plate and insufficient energy, it is easy to produce slag on the lower surface.
Therefore, when laser cutting stainless steel plates, the focus position should be selected inside the material. In order to improve the fluidity of gas and molten metal, to ensure that the lower part has sufficient energy density, so that the smooth surface range is expanded.
If you want to know more about the professional issues of laser cutting machine, welcome to consult Leapion Laser.