Fiber Laser Cutting Experiment Based on Special Materials

in Here is your first Forum Tue Jan 31, 2017 10:06 pm
by Eyes123456 • 29 Posts

Whitney often conducts fiber laser cutting detection and evaluation of new materials or special materials according to customers' requirements. Aluminum and stainless steel used in the aerospace industry, magnetic materials used in the rotor, zinc plates used in the flooring industry As well as many other materials were tested. What are the advantages and challenges of fiber green laser pointer in cutting these materials compared to non-thermal processes and what are the advantages of cutting high-contrast materials compared to CO2 lasers?

Customers often find Whitney with their special materials for use in aerospace, storage, manufacturing, construction and transportation, as well as specific customizations. Although these materials have never been used fiber laser cutting, customers still expect fiber lasers can be better than they are currently used in the process.

Whitney recently tested a laminate for use in the aerospace industry with a substrate of 0.762 mm and several layers of 0.076 mm laminated material with a total thickness of 1.524 Mm. Whitney tested stainless steel and aluminum gaskets. Whitney first tested a small sample cut to determine the cutting parameters, and then carried out the actual parts of the cutting test. Tests were performed using a variety of methods, including which of the methods of cutting from the front and back sides of the laminate were better to achieve better cutting results. "The other is to set the parameters precisely, making sure that the cutting edges are not welded together, which is particularly important when cutting the sheet," Bartholomew said. "If the cutting edges are welded together, you can not peel off the laminate."

A large number of samples were tested with different parameters, cutting from the front of the laminate, cutting at the back, different cutting speeds, and finally confirming that the fiber red laser pointer were able to perform gasket cleaning without cutting edges and breaking the laminate Cutting. "In this case, our cutting speed can be cut to 22.86 m / min from the back of the aluminum gasket, and to 3.048 m / min for stainless steel gaskets," Bartholomew said.

Whitney recently completed another test material, is used to manufacture motor and engine rotor in the laminated metal magnetic stainless steel. Parts with a complex shape, material thickness of only 0.0635 mm, the tolerance is extremely stringent requirements. Each piece must be cut exactly the same, and then in accordance with the needs of manufacturers in between the two into other materials. Parts made of stamping, the need for precision molds. "Customers are looking for a small batch process," says Bartholomew. "Because stamping dies can be very expensive, they want to find a way that does not need to be too fast, but at a lower cost of operation."

By adjusting the parameters of the standard fiber strongest laser pointer, Whitney successfully cut the magnetic material, the speed of up to 10.16m / min. Adjusted parameters include power, speed and focal length. Auxiliary gas pressure and nozzle types are also optimized to achieve the fastest cutting speeds and the cleanest cutting process. The challenge of fiber laser cutting is not in the cutting itself, but in the application. "The magnetic properties of the material itself can not be changed," Bartholomew says, "because that will change the interaction of the stainless steel sheet with the motor and the magnetic field." Similarly, the heat input to the material surface during processing will affect the structure of the material, Test its performance to determine whether the use of fiber laser cutting is feasible.

Plastics usually do not use fiber lasers, he said. "For the same reason, the wavelength range of fiber burning lasers for sale is particularly suitable for processing metal materials, but not suitable for plastic and acrylic.CO2 laser wavelength is just can be plastic absorption, so its good effect in the processing of plastic.This is the optical fiber Lasers and CO2 lasers, but fiber lasers are not a possibility, and we're willing to give it a shot. "

Fiber lasers are particularly well suited for processing metal materials because they have a wavelength of only 1.06 μm and a CO2 laser is 10.6 μm. The former is only one-tenth of the latter, so the material absorption of laser energy difference significantly. The use of fiber lasers to cut special materials requires extensive knowledge of power, beam quality, type of auxiliary gas and pressure, nozzle design, focus position and cutting speed. Optimization and balance of these parameters, and sometimes we need to do some necessary modifications to the machine. For example, a typical buy laser pointer cutting head height sensor can only sense metallic materials, so if other nonmetallic components are used to influence the high sensing performance, other height sensing techniques may be required.

As a mature process, the application of fiber lasers in high-contrast materials is another significant difference from CO2 lasers. "If you cut a high-reflectance material with CO2 lasers, then it is certainly a failure, because the power or light beam transmitted to the material will be reflected back," Bartholomew said. "The CO2 laser's beam path is made up of a series of mirrors, which are reflected back into the resonator, and a large amount of reflected power can damage or even destroy the resonator, so the sensor or the special reflective element that prevents the reflected light from passing through Some adjustments, which are complex and somewhat difficult. "

Fiber lasers are more suitable for cutting a variety of high-anti-material. "With a properly designed transmission fiber," he says, "if the reflected light enters the fiber, the fiber absorbs it so that it does not reach the 30mw laser pointer source, and the high beam does not have the chance to propagate back into the fiber."

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