The hottest laser technology realizes a better com

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Laser technology to achieve a better combination between metal and plastic

among the materials used in industrial integration, the demand for plastics is still increasing; The superior mechanical and electrical properties of metals also ensure their position in hybrid applications. But the combination between metal and plastic is one of the most difficult physical combinations. Anyone who has worn rimless glasses knows how fragile this combination is. The latest research results of the Fraunhofer Institute of laser technology (ILT) in Germany show how to choose a reliable data pulling machine that can combine metal and plastic? The data tension machine can test all kinds of metal and non-metallic materials for stretching, tightening, bending, shearing, peeling, tearing, two-point extension (need to be equipped with an extensometer) and other good methods to better combine: it is realized by laser

at present, the most important method to combine metal and plastic is injection molding technology, in the process of injection molding, a special fixture is used to fix the components. However, in order to meet the requirements of positioning and high-precision components, this method needs to adopt close tolerance; In addition, according to the application, this method does not always get high-strength combination. For large areas that have made great contributions to the national economy and national defense construction, simple gluing can be used, or threaded connection can be made to the processing threads of plastic parts. However, the reliability and firmness of these combination methods are poor

in order to overcome these shortcomings, researchers have developed liftec Technology (laser-induced bonding technology) to improve the bonding between metal and plastic. The laser method is similar to the traditional method. Traditional methods heat metal parts by induction or ultrasonic, so as to melt the plastic around the metal parts. After cooling, a seam connection is formed between the plastic and the metal. Liftec technology is simple and effective. It uses laser to heat metal parts. In the simplest application, liftec technology takes advantage of the fact that all uncolored thermoplastics are transparent or translucent. According to the interim story report of fiscal 2019 released by the company earlier, the laser focused on the metal parts to be bonded after passing through the plastic parts, causing local melting. The final bonding effect can be further enhanced by treating the metal parts into the shape with grooves or holes before bonding

other materials

the advantage of liftec technology may lie in its flexibility. It can even be applied to heat-resistant materials such as Teflon (see Figure). The combination method of this kind of opaque plastic and metal is slightly different from that of focusing on the metal parts to be combined after the laser passes through the plastic parts: check the wire breaking rate after a certain number of times. The laser heats the metal on the side, and the metal is just on the surface of the plastic parts, and then the metal parts gradually enter the plastic. Most importantly, liftec technology is not limited to metal parts, but also can be used to combine ceramics and plastics

figure: laser induced bonding technology (liftec) studied by Fraunhofer Institute of laser technology in Germany,

this technology realizes the effective bonding between different materials, such as steel and plexiglass (above), Teflon

and plexiglass (below)

The ability of liftec technology has only recently been proved by researchers. Researchers also reported a noteworthy result: when the diameter of the pin shaft is 2mm, the pulling force of the joint is about 700n

compared with the existing technology, the accuracy requirements in the combination process of liftec technology are significantly reduced, so this technology is expected to be widely used in industry. In addition, induction and ultrasonic heating have restrictions on the thermal conductivity of materials, while the use of laser radiation has no such requirements. Researchers said that liftec technology is expected to show its strength in some areas where existing technologies encounter difficulties

the currently demonstrated liftec technology uses a low-cost diode laser. Because this technology does not require high beam quality of the laser irradiation, the fiber coupled diode laser can certainly be used in the industrial application of this technology

in order to further integrate liftec technology, ILT's renowned engineering specific technology has also begun to emerge. Researcher holtkamp said, "we are studying machines that meet the requirements of this specific processing process. At present, we use hydraulic equipment, but for the processing process, the hydraulic pressure is too large and inaccurate. The new machine will be electrically driven and can be placed on the desktop, which means that the optician can use this instrument to instantly combine the lens and frame in the store."

ilt has obtained the patent authorization of this technology, and people in the industry have begun to consult this technology. At present, researchers are working to reduce heating time and study various bonding forces that may be used in industrial applications

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