What is a Fiber Laser Cutting Machine?
A fiber laser cutting machine is a high-precision, high-efficiency processing equipment that uses a fiber laser as its core light source to perform non-contact cutting of materials through high-energy-density laser beams. It integrates laser technology, CNC technology, precision mechanical technology, and automation control technology, enabling fast and accurate cutting of complex 2D or 3D shapes.
Working Principle
The working principle of a fiber laser cutting machine is based on the photothermal effect of lasers. First, multiple parallel multi-mode pump diodes serve as the laser source to generate laser light at a specific wavelength. The laser is then adjusted in the resonant cavity and coupled into a single optical fiber doped with rare earth elements. Subsequently, the laser is enhanced through multiple reflections in the fiber amplifier, ultimately forming a highly coherent laser beam. When this laser beam is focused on the workpiece surface, the irradiated area instantly melts and vaporizes. The CNC system then moves the spot position to achieve automatic cutting.
Key Features and Advantages
Fiber laser cutting machines offer numerous outstanding advantages:
Excellent beam quality: Smaller focused spot, finer cutting lines, higher work efficiency, and better processing quality
High cutting speed: Twice that of CO₂ laser cutting machines of the same power; thin plate cutting speed can exceed 40m/min
High photoelectric conversion efficiency: Approximately 30%, three times that of CO₂ laser cutting machines, making it energy-efficient and environmentally friendly
Low operating cost: Power consumption is only 20-30% of comparable CO₂ laser cutting machines; no laser working gas required; no reflective mirrors needed
Easy maintenance: Fiber optic transmission eliminates the need for optical path adjustment; key components have a service life of up to 100,000 hours
Material Applicability
Cuttable metal materials: Stainless steel, carbon steel, alloy steel, silicon steel, spring steel, aluminum, aluminum alloy, galvanized sheet, pickled plate, copper, silver, gold, titanium, and other metal sheets and tubes.
Materials not suitable for fiber laser cutting:
Non-metallic materials: Fiber laser cutting machines are primarily designed for metal materials. Since the fiber laser wavelength (approximately 1064nm) is not within the ideal absorption range of non-metallic materials such as fabric, leather, wood, stone, and plastic, the absorption effect is poor, making it difficult to achieve ideal cutting results. Currently, fiber laser cutting machines do not offer significant advantages in non-metal cutting applications.
Highly reflective metal materials (aluminum, copper, etc.): These materials have high reflectivity. Since the laser wavelength is not within their ideal absorption range, most of the energy is reflected back, which can easily damage the protective lens in front of the laser head. Long-term use is inefficient and increases consumable usage. However, using pulsed laser beams can partially improve cutting results by causing a sudden increase in the material's absorption coefficient due to the extremely high peak power of the pulse.
Relationship Between Cutting Thickness and Power
The cutting capability of a fiber laser cutting machine is closely related to its power:
Higher power enables greater cutting thickness: Generally, the higher the power, the thicker the metal plate that can be cut
Thinner materials allow faster cutting speeds: Fiber laser cutting machines show particularly significant advantages for thin plates
It's important to note that thinner plates are not always easier to cut. For example, when using a fiber laser cutting machine on a 0.55mm thick metal sheet, issues such as warping of the remaining material may occur due to the sheet being too thin, affecting precision. Therefore, it is essential to select equipment with appropriate power based on actual processing requirements.
Application Fields
Fiber laser cutting machines are widely used in sheet metal processing, aerospace, aviation, electronics, electrical appliances, automobile manufacturing, grain machinery, textile machinery, engineering machinery, precision parts, shipbuilding, metallurgical equipment, elevators, home appliances, crafts and gifts, advertising production, kitchenware processing, and various other manufacturing industries.
