When laser cutting is used in sheet metal, there will be burning edge and slag hanging, which not only affects the precision and beauty of the product, but also reduces the quality of the product, and brings great economic loss to the enterprise. How can we effectively avoid and deal with this problem? Chuang Xiaobian is going to popularize the knowledge of metal laser cutting and burning.
Analysis of the causes of cutting edge by metal laser cutting machine
The metal laser cutting machine produces a large amount of heat when processing the sheet metal. Under normal circumstances, the heat generated by the cutting will be cooled down to the processed sheet metal. In the processing of small holes, the metal laser cutting machine can be fully cooled on the outside of the hole. The small hole inside the single hole is small because of the heat diffusible space, and the heat is too concentrated to cause excessive burning, slag and so on. In addition, in the thick plate cutting, the molten metal accumulated on the surface of the material and the accumulation of heat can make the auxiliary air flow disorder and the heat input too much, thus causing excessive burning.
The solution to the over burning of the 1. metal laser cutting machine in the cutting of carbon steel holes: in the carbon steel cutting with oxygen as auxiliary gas, the key to solve the problem lies in how to restrain the generation of oxidation reaction heat. The method of auxiliary oxygen or delayed switching can be used to cut auxiliary air or nitrogen. This method can be used to process the small holes of the 1/6 thick plate. The pulse cutting condition of low frequency and high peak output power can reduce the heat output and help optimize the cutting conditions. Setting the condition as a single pulse laser beam, high peak output and low frequency condition of high energy intensity can effectively reduce the accumulation of molten metal on the surface of the material during the process of perforation and effectively suppress the heat output.
The solution of 2. metal laser cutting machine in the cutting of aluminum alloy and stainless steel: in the processing of this kind of material, the auxiliary gas used in this kind of material is nitrogen. In the cutting, there will be no burning edge. However, because the temperature of the material inside the small hole is very high, the phenomenon of the inside slag hanging will be more frequent. The effective solution is to increase the pressure of auxiliary gas, and set the conditions as high peak output and low frequency pulse conditions. As the auxiliary gas is used in air, it will not burn as well as nitrogen, but it is easy to have slag in the bottom. It needs to be set to high auxiliary gas pressure, high peak output, low frequency pulse condition.
标签:   钣金加工 激光切割加工