In operation, the cutting of different shape parts can be applied only by changing the NC program, which can be cut in 2D as well as 3D. (3) Combined with the computer, the whole plate can be arranged to save material. B: Puncture height Required fields are marked *. When cutting flammable materials such as cotton, paper, the inert gas is been used. The type of cutting gas to be targeted needs to be selected according to the characteristics of the individual sheets. The higher the purity, the brighter the cutting surface. According to the above inference, the general rule of the cutting speed of the thin plate can be obtained: The freshmancan also use this ruleas the basis for selecting auxiliary gases. are prone to cracking during or after processing, and quartz glass with a thickness of less than 2 mm has good cutting properties. Titanium plates are cut with argon and nitrogen as processing gases. The laser cutting process has low noise, small vibration and no pollution. For example, the laser cutter with 2KW laser power been adopted, the cutting speed of carbon steel with 8mm thickness is 1.6m/min. The cutting speed shows the parabolic relationship with the surface roughness of the cutting section. Your email address will not be published. That is to say, in the case where the processing power, the material, and the thickness of the sheet are the same, the larger the gas pressure, the more smoke dustthat can be blown off at the unit speed. N2:The energy generated by the RF generator first excites N2, causing it to be in a transition state. The properties of the material near the slit are also almost unaffected. Unfortunately there is no easy road to achieve the optimum performance on our particular machine, we have to run many cuts and write down everything, every setting that we programmed for that cut and within the parameters recommended by the manufacturer, eventually we find out the best one for that particular machine. On the one hand, the gas is produced by the cutting of metal, and the oxidation reaction occurs, which gives off a lot of oxidation heat. With the moving of the workpiece, the hole is synchronized horizontally to form a slit in the direction of cutting. The cutting speed of the cutting system has exceeded 100m/min. Typical products that have been adopted are: automatic elevator structural parts, elevator panel, machine tools and food machinery outer cover, various electric gas cabinets, switchgear, textile machinery parts, construction machinery structural parts, large motor silicon steel sheet, etc. The size accuracy of the cutting parts can be up to + 0.05mm. Hi, Of course, the oxygen flow rate is not the higher the better, because the fast velocity can lead to the rapid cooling of the metal oxide, which is also detrimental to the cutting quality. In order to overcome this phenomenon, placed the high sensitivity of the capacitive sensor on the cutting head, to realize the real-time feedback of the distance information between the nozzle and panel to the CNC system. Use the auxiliary gas to blow away the slag in the coaxial kerf, Cool the surface of the processed object to reduce the heat affected zone, Cool the protective lens to prevent contamination of the lens and cause the protective lens to overheat, Some cutting gases can also protect the base metal. Which auxiliary gas should be selected for different plates? T: Sheet thickness. Laser cutting forming technology also has a wide range of applications in the field of non-metallic materials. It is a non-contact cutting tool, which means: (1) No mechanical deformation of the workpiece; (2) No tool wear, no tool conversion problem; (3) The cutting material does not need to consider its hardness, that is, the laser cutting ability is not affected by the hardness of the cutting material, and any material with hardness can be cut. The cutting edge is affected very small by the heat, and there is no deformation of the workpiece. In the process of vaporization, the steam takes away the melting point and scour debris, forming holes. In order to prevent the sediment from entering the pump, a uniform slit of 0.3mm wide was cut on the alloy steel tube with a thickness of 6~9mm. Under certain plate thickness and cutting speed, there is an optimal range of laser power. This post just answer your questions about laser cut kerf: https://www.machinemfg.com/things-you-should-know-about-laser-cut-kerf/. The Ultimate Guide to Fiber Laser Cutting, The Ultimate Guide to Fiber Laser Cutting Machine, What Is Fiber Laser? With the mature and perfect technology of high power fiber laser generator in recent years, its application field is expanding continuously, and the fiber laser cutting machine has become the hot spot of industry research and development. The metal around the spots melts due to thermal diffusion. I do a lot of thinking, reading, and writing around sheet metal fabrication, machining, mechanical engineering, and machine tools for metals. The sheet cutting speed is 2 ~ 4 times of CO2. Other parameters can refer to nickel-chrome steel. The auxiliary gas entering the nozzle can also cool the focus lens, prevent the dust from entering the lens seat to contaminate the lens and cause the lens to overheat. Aerospace components processed by laser cutting include engine flame tube, titanium alloy thin-wall machine, aircraft frame, titanium alloy skin, wing long stern, tail siding, helicopter main rotor, space shuttle ceramic heat insulation tile, etc. For example, when cutting stainless steel materials, when the requirement for the quality or surface quality of the products is not high (for example, after the cutting the products need to be painted and through other processing processes), air can be used as the cutting gas, which can reduce the cost. Such as the pattern of an art photograph album, Chinese and English fonts of the company, government department, the hotel, the shop sign, the station, the pier, the public place. The heavy metal processing industry which means a lot to the industrial manufacturing system, many metal materials, no matter how hard it is, can be cut without deformation. its very useful for users. It uses the laser as the preheating source and uses the oxygen and other active gases as the cutting gas. The coating oil film on the surface of the plate will get better perforation effect without reducing the processing quality. Much appreciated ! Under this heat, the material is formed by a small hole filled with steam, surrounded by molten metal walls. It is also not easy to achieve success by cutting a very large and closed shape. What aspects of cutting quality will be affected by different gases? Thank you. The laser fusion cutting does not require the complete vaporization of the metal, the required energy is only 1/10 of the vaporization. The main applicable plates are stainless steel, plated steel, brass, aluminum, aluminum alloy, etc. It is estimated that when the steel is cut, the amount of heat released by the oxidation is about 60% of the total energy required for cutting. (2) combustion material is transferred into slag to control the combustion rate of oxygen and metal, and the speed of oxygen diffusion through the slag to the ignition front has a great impact on the combustion speed. The main function is to help burn and blow off the cut melt. The material will get better results when it is cut with oxygen. The proportional relationship between the above mentioned three gas is: Fiber Laser cutting is a hot cutting method which makes use of the focused high power density laser beam as the main heat source to illuminate the workpiece, cause the irradiation materials rapidly melting, evaporation and ablation or reach the ignition point. The cutting speed of stainless steel with 2mm thick is 3.5m/min, and the thermal influence area and the deformation are very small. Brass with a thickness of 1mm can be cut with nitrogen. Of course, for high-reflectance materials such as gold, silver, copper, and aluminum, they are also good heat transfer conductors, so laser cutting is difficult and cant even be cut. Great job Cutting low carbon steel plate generally USES oxygen. Best regards, Your email address will not be published. As a sophisticated machining method, laser cutting can cut almost all materials, including 2D or 3D cutting of thin metal sheets. The higher the oxygen flow rate, the faster the combustion chemical reaction and the removal of slag. Nitrogen is usually used for cutting stainless steel and aluminum alloy materials. Thanks. As the cutting speed increases from zero, the surface roughness of the section decreases gradually and the cutting speed continues to increase. As the cutting speed decreases, the slit width will increase. The role of oxygen in the cutting process of carbon steel is to fuel and blow off the molten material. When cutting aluminum alloy, the focal position is close to the lower surface of the plate. When oxygen is used as a processing gas, the cutting edge is slightly oxidized. The cutting speed of the controlled fracturing cutting is fast and does not require too much power, otherwise, it will cause the surface of the workpiece to melt and break the edge of the cutting. Send us a message or leave your comment below to let us know what's in your mind. Just missed a little section about piercing but still this is the best there is!! Special attention is paid to the study of the technology of nitrogen cutting low carbon steel to improve the cutting quality of the plate. How to Check The Paint Color Difference of The Product? The adoption of flexible light guiding system of optical fiber laser and beam transmission distance is constant, fundamentally avoid poor cutting quality which caused by the length of the light path changes of the CO2 laser generator. Fiber Laser cutting equipment can cut stainless steel below 4mm, and can cut up to 8 ~ 10mm thick stainless steel in laser beam if add oxygen. Generally speaking, the larger the laser power, the thicker the cutting board and the faster-cutting speed. Laser cutting can achieve better cutting quality due to the small laser spot, high energy density and fast cutting speed. The roughness of the cutting surface is the smallest in this range. The laser beam is focused to form a very small operating point with strong energy, and it is applied to cutting with many characteristics. The metal vapor in the small pit rapidly expands, causing a micro-explosion, and the molten material is ejected at a high speed to generate a highly directional anti-shock wave, so that a holewith a large upper side and a small lower sideis formed on the surface to be processed. After laser cutting, the width of the heat-affected zone is small, the performance of the material near the slit is almost unaffected, and the deformation of the workpiece is small, the cutting precision is high, the geometry of the slit is good, and the shape of the slit cross-section is relatively regularrectangular. When the power density of the incoming laser beam exceeds a certain value, the material inside the beam irradiation point begins to evaporate and then forming a hole. In the area of thin plate cutting, traditional CO2 laser and YAG laser is gradually occupied by fiber laser generator, mainly for the following reasons: Low cost. In recent years, optical fiber laser cutting machine has been widely used to make metal laser cutting more convenient and efficient. In my specific case I was after good surface finish in 4mm stock 2mm slit and +/- 0.1mm or better tolerance. Hi, I'm Shanefounder of MachineMfg. But how can we judge whether a laser cutter is good? No machining is required, and the parts can be used directly. Due to restricted by laser power and equipment volume, the laser cutter can only cut the small thickness of plate and pipe material, and with the increase of workpiece thickness, the cutting speed decreases significantly. Part of the material requires oxygen to participate in the puncture, Stainless steel, aluminum, galvanized sheet. Glad to hear that. Privacy Policy | Terms and Conditions | Sitemap. It is important to note that the oxygen contains impurities such as water, which can seriously affect the cutting quality of the plate surface. Hello, thank you for this detail explanation. The auxiliary gas can prevent slag from returning during the cutting process, thereby protecting the internal lens of the laser head. What Are The Criteria? When cutting the 2mm stainless steel sample in below FIG, the focus position is about 0.8 ~ 1.2mm below the surface of the plate. Since there is no tooling cost, the laser cutting equipment is also suitable for small batches of parts that can not be processed previously. The laser cut clean through iron as though it were mud, this is no exaggeration. Its in high precision, better than plasma cutting. In addition to the above application, the application is also expanded to: 13D laser cutting system or industrial robot is used to cut the space curve. When the steel is cut, oxygen is used as the auxiliary gas and molten metal to produce exothermic chemical reaction oxidation material, while helping to blow away the slag in the slit. Comparison of ordinary lighting and laser: Laser generating gas is different from cutting gas. How is the pressure of the auxiliary gas controlled? I just wonder if my idea is possible. It is important to note that this controlled fracturing cutting is not suitable for cutting acute angle and arm of angle. Laser cutting equipment costs high, which means a high one-time investment. Then, how tochoose an auxiliary gas? When the cutting speed increases to a certain value, it will be unable to cut through the plate. Acrylic, polyethylene, polypropylene, polyester, PTFE. Air can be supplied directly from the air compressor, so it is very cheap compared to other gases. Well described post.Thanks for sharing this useful information. The end of the slit is black or dark yellow. For brittle materials prone to heat damage, high speed and controllable cutting through laser beam heating are called controlled fracturing cutting. Based on the characteristics of the gas, such as flammability and combustion, and various attempts, the following experience is obtained. The cutting material is low carbon steel platewith 6.2mm thickness. In the process of laser cutting, the laser focus position has a great influence on the surface quality of the parts after cutting, and different materials have different requirements on the focus position. The auxiliary gases commonly used in laser cutting are nitrogen, oxygen and air. The flow rate varies depending on the type of nozzle, but generally it is large. Secondly, lasers can cut nonmetals, while other hot cutting methods cannot. Laser cutting machine is a kind of equipment that can partially replace traditional metal cutting method. The cutting quality of the laser cutting machine is an important standard to judge whether the cutting machine is qualified. Compared with other thermal cutting methods, laser cutting is characterized by fast cutting speed and high cutting quality. The role is to prevent oxidation and blow off the melt. This is a must read for any fiber laser technician/operator. Its purity requirement is generally 99.95% or higher. The cutting speed can reach 600cm/min for 2mm mild steel with 1200W laser cutter while the speed can reach 1200cm/min for 5mm Polypropylene resin plate. Pure aluminum is very difficult to cut because of its high purity. are not suitable for air because the air will oxidize the base material. The key considerations are the cost of cutting and the requirements for the product. The laser power has a great influence on cutting thickness, cutting speed, cutting width and cutting quality. The surface of the cutting surface is clean and beautiful, the surface roughness is only a few tens of microns, even laser cutting can be used as the last procedure, no need machining, the parts can be used directly. Numerous varieties of cutting materials. Is the laser beam at the center of the nozzle? When the cut product is the final product, there is no subsequent process, and it is necessary to use a protective gas, such as a craftproduct. This post might be helpful for you: https://www.machinemfg.com/factors-closely-related-to-laser-cutting/. If low-speed processing is used, the thin plate can be cut, and metals such as single Ti and Zr need to use air as the auxiliary gas. In general, many gases are versatile. The high-quality laser beam, laser energy can achieve stepless regulation. After laser cutting, the thermal effect area is very small. It can blow the cutting piece be melted and vaporized, can also blow the smoke in the process of cutting, so as to reduces the barriers to cutting the workpiece. In practical applications, the height of the focus varies with the material and the cutting machine. In this case, the cutting edge will not be oxidized. For example, cutting 12mm stainless steel requires 150m3/h, while cutting 3mm requires only 50m3/h. The principle of laser oxygen cutting is similar to that of oxyacetylene cutting. hi, These vapors spew out very fast, making an incision in the material at the same time as the vapor. In the field of automobile manufacturing, the cutting technology of space curves such as car roof windows has been widely used.
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