Laser cutting mechanism nitrogen machine

The main advantages of laser cutting nitrogen machines are high cutting quality and wide processing range. In nitrogen cutting, the material is completely melted by laser energy, and nitrogen is blown out of the cutting seam to avoid inappropriate chemical reactions. The temperature in the melting point area is relatively low, coupled with the cooling and protective effect of nitrogen, the reaction is stable and uniform, and the cutting quality is high.

Equipment Introduction

1. Nitrogen equipment, with an outlet nitrogen flow rate of 10Nm3/h to 500Nm3/h, a nitrogen purity of 99.99% or above, and a nitrogen pressure of 14kg to 22kg. The system consists of a compressed air system, an air purification system, a nitrogen production device, and a booster equipment.

2. According to the auxiliary gas used, laser cutting can be divided into two cutting methods: oxygen and nitrogen. In oxygen cutting, oxygen participates in combustion and the melting temperature is close to the boiling point. High temperature leads to intense reactions, making it impossible to ensure smooth cross-sections; In addition, oxidation reactions and an increased heat affected zone result in relatively poor cutting quality, which can easily lead to quality defects such as wide cutting seams, oblique cross-sections, poor surface roughness, and welding slag. In nitrogen cutting, the material is completely melted by laser energy, and nitrogen is blown out of the cutting seam to avoid inappropriate chemical reactions. The temperature in the melting point area is relatively low, coupled with the cooling and protective effect of nitrogen, the reaction is stable and uniform, and the cutting quality is high. The cross-section is delicate and smooth, with low surface roughness and no oxide layer.

3. The cutting cost of high-purity nitrogen is three times higher than that of high-purity oxygen. Oxygen cutting requires a pressure of (1-4) * 105Pa, while nitrogen requires (10-140 * 105Pa). For example, when cutting a 2mm thick stainless steel plate, oxygen requires a pressure of 4 * 105Pa and a gas consumption of 2.3m3/h, while nitrogen corresponds to 14 * 105Pa and 15.2m3/h. Moreover, high power is required for nitrogen cutting, which increases energy consumption accordingly. The comprehensive cost of nitrogen cutting is more than 15 times that of oxygen cutting.

4. Oxygen assisted combustion increases heat and increases cutting thickness within the processing range. The advantage lies in low cost, mainly used in carbon steel. Nitrogen does not assist combustion and has a lower temperature in the melting area, making it suitable for processing low melting point materials such as aluminum and brass. Nitrogen gas protects the cutting seam from oxidation and can also be used for non oxidation cutting of stainless steel. Attachment: Application of Nitrogen Cutting Nitrogen cutting has solved many processing difficulties in actual production and expanded the processing range to areas where oxygen cutting is difficult to process, such as aluminum and brass.

Attachment: Below is an introduction to its application in the carbon steel and stainless steel industries.

1. Carbon steel and carbon steel are cut using oxygen. The surface temperature is very high due to carbon assisted melting and oxygen assisted combustion. When cutting sharp corners and holes with a diameter smaller than the material thickness, excessive heat is concentrated in the narrow area, making it impossible to guarantee cutting quality. Nitrogen does not assist combustion, and its cooling effect is suitable for solving such processing problems, which can improve product quality.

2. From a cost perspective, oxygen cutting is used for stainless steel parts that are not affected by oxidation at the cutting edge. However, the content of alloying elements such as Ni in stainless steel is relatively high, resulting in high viscosity and poor fluidity of the molten material. The lower air pressure during oxygen cutting can easily lead to quality defects such as slag sticking. The oxide layer seriously affects the welding quality when welding stainless steel, especially in argon arc welding. The high-quality non oxidation section provided by nitrogen cutting meets the high requirements of stainless steel welding for cutting sections.