Introduction of metal laser numerical control cutting machine processing method

In the field of metal cutting, laser CNC cutting machine is undoubtedly one of the most sophisticated processing methods. In most companies and operators, the type of laser cutting may not be much different, but as a professional laser processing, it is different. The characteristics of metal materials, laser CNC cutting machine processing methods will also be different. The following Wuhan Jiabei Technology will explain the classification of several major metal laser CNC cutting machines on the market.

First, the laser cutting machine flame cutting method

The laser flame cutting of laser numerical control cutting machine differs from laser melting cutting in that oxygen is used as the cutting gas. A chemical reaction is generated to further heat the material by means of the interaction between the oxygen and the heated metal. Due to this effect, for structural steels of the same thickness, the cutting rate obtainable by this method is higher than that of melt cutting.

On the other hand, this method may have a worse cut quality than melt cut. In fact it produces wider slits, significant roughness, increased heat affected zone and worse edge quality. Laser flame cutting is not good when machining precision models and sharp corners (there is a danger of burning sharp corners). Pulse mode lasers can be used to limit thermal effects, and the power of the laser determines the cutting speed. In the case of a constant laser power, the limiting factor is the supply of oxygen and the thermal conductivity of the material.

Second, laser CNC cutting machine gasification cutting method

In the gasification cutting process of the laser of the laser numerical control cutting machine, the material is gasified at the slit, in which case a very high laser power is required.

In order to prevent the material vapor from condensing onto the slit wall, the thickness of the material must not exceed the diameter of the laser beam. This processing is therefore only suitable for applications where it is necessary to avoid the exclusion of molten material. This processing is actually only used in the small field of use of iron-based alloys. This processing cannot be used for materials such as wood and certain ceramics, which are not melted and thus are less likely to recondense the material vapor. In addition, these materials typically require thicker cuts. In gasification cutting of lasers, optimal beam focusing depends on material thickness and beam quality. Laser power and heat of vaporization have only a certain effect on the optimal focus position. In the case of a constant sheet thickness, the maximum cutting speed is inversely proportional to the material's vaporization temperature. The required laser power density is greater than 108 W/cm ² and depends on the material, depth of cut and beam focus position. In the case of a constant sheet thickness, assuming sufficient laser power, the maximum cutting speed is limited by the gas jet velocity.

Third, laser CNC cutting machine melting cutting method

In the laser melting cutting of a laser numerical control cutting machine, the workpiece is partially melted and the molten material is ejected by means of a gas flow. Since the transfer of material occurs only in its liquid state, this process is called laser melt cutting.

The laser beam is matched with a high-purity inert cutting gas to cause the molten material to leave the slit, and the gas itself is not involved in cutting. Laser melt cutting can result in higher cutting speeds than gasification cutting. The energy required for gasification is generally higher than the energy required to melt the material. In laser melt cutting, the laser beam is only partially absorbed. The maximum cutting speed increases as the laser power increases, and decreases almost inversely proportionally as the thickness of the sheet increases and the material melting temperature increases. In the case of a constant laser power, the limiting factor is the air pressure at the kerf and the thermal conductivity of the material. Laser melt cutting provides an oxidative cut for the iron material and titanium metal. The laser power density that produces melting but less than gasification is between 104 W/cm ² and 105 W/cm ² for steel materials.

Wuhan Jiabide Technology Co., Ltd. is a professional manufacturer of CNC cutting machine, CNC laser cutting machine, CNC flame cutting machine, CNC plasma cutting machine, CNC flame plasma dual-purpose cutting machine, advertising CNC cutting machine, CNC intersecting wire cutting machine, The company is always a high-tech enterprise integrating CNC products. The company always adheres to the business philosophy of “winning by quality and honesty” and adheres to the guiding principle of “service-oriented and market-oriented”. In the principle of customer first, the pursuit of perfect service. 24 hours to provide host display, sales, door-to-door, installation and commissioning, technical maintenance and other services. Maximize service to users.