Laser cutting is to use a focusing mirror to focus the CO2 laser beam on the surface of the material to melt the material, while blowing the melted material with a compressed gas coaxial with the laser beam, and moving the laser beam and the material along a certain trajectory to form a relative movement. A certain shape of the slit. In industrial production, laser cutting technology is widely used in the processing of metal and non-metal materials, which can greatly reduce processing time, reduce processing costs and improve workpiece quality. For the combination of metal and plastic, the latest research from the Fraunhofer Institute for Laser Cutting Machine Technology (ILT) shows a better combination of metal and plastic with a laser cutter. A good way.
At present, the most important method of combining metal and plastic is injection molding technology, in which a component is fixed by a special clamp during the injection molding process. However, in order to meet the requirements of positioning and high-precision components, tight tolerances are often required; in addition, depending on the application, this method does not always achieve a combination of high strength. For larger areas, simple gluing can be used, or the threading of the plastic part processing threads can be made. However, the reliability and robustness of these combined methods are poor.
To overcome these shortcomings, the researchers developed the LIFTEC technology (laser cutter induction bonding technology) to improve the bond between metal and plastic. The laser cutting machine method is similar to the conventional method. The conventional method heats the metal parts by induction or ultrasonication, thereby melting the plastic around the metal parts, and after cooling, a joint is formed between the plastic and the metal. LIFTEC technology uses a laser cutter to heat metal parts. In the simplest application, LIFTEC technology takes advantage of the fact that all unpigmented thermoplastics are transparent or translucent. The laser cutter passes through the plastic part and focuses on the metal part to be joined, causing local melting. The final bonding effect can be further enhanced by treating the metal part into a shape with grooves or holes prior to bonding.
The advantage of technology is its flexibility, which can even be applied to heat resistant materials like Teflon. This type of opaque plastic and metal bonding method is slightly different from the laser cutting machine that is focused on the metal part to be bonded after passing through the plastic part: the laser cutting machine heats the metal on the side and the metal is located on the surface of the plastic part, then the metal part Gradually enter the plastic. Most importantly, LIFTEC technology is not limited to metal parts, but can also be used to combine ceramics and plastics.
Laser cutting machine induction bonding technology (LIFTEC), researched by the Fraunhofer Laser Cutting Machine Technology Research Institute, Germany, enables the effective combination of different materials, such as steel and plexiglass, Teflon and plexiglass. The capabilities of LIFTEC technology have only recently been demonstrated by researchers, and the researchers also reported a noteworthy result: when the pin diameter is 2mm, the force of the pull-open bond is about 700N. Compared with the prior art, the accuracy requirement in the combination process of LIFTEC technology is greatly reduced, so the technology is expected to be widely used in the industry. In addition, induction and ultrasonic heating have limitations on the thermal conductivity of the material, which is not required for radiation using a laser cutter. Researchers say that LIFTEC technology is expected to play a significant role in some areas where existing technologies are having difficulty.
At present, LIFTEC technology uses a low-cost diode laser cutting machine. Since the technology does not require high beam quality for the laser cutting machine used, the fiber-coupled diode laser cutting machine can meet the industrial application of the technology.
In order to further integrate the LIFTEC technology, ILT's renowned engineering-specific technology is also beginning to emerge. Researcher Holtkamp said: "We are working on machines that meet the requirements of this particular process. Currently we use hydraulic equipment, but the hydraulic pressure is too large and inaccurate for the process. The new machine will be powered and can be placed in On the desktop, this means that the optician can use the instrument to instantly combine the lens and frame in the store."
A patent license for this technology has been obtained, and industry professionals have begun consulting the technology. Researchers are currently working to reduce heating time and to study the various bonding forces that may be used in laser cutting machine industrial applications. It is believed that in the future industrialization process, LIFTEC technology will be able to show its talents, making our industrial processing more efficient, higher energy and higher quality.
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