Laser technology to achieve better combination between metal and plastic
industry combined with the use of materials, the demand for plastic continues to increase; And metal in mechanical and electrical aspects of superior performance and ensure the status of its application in the mixed. But between metal and plastic is one of the most difficult physical combination, the combination of any one take over his rimless glasses knows how fragile the combination. Germany's fraunhofer institute of laser technology ( ILT） The latest research results shows a kind of metal and plastic can be a good way to better together: using laser.
at present, the combination of metal and plastic injection molding is the primary method of forming technology, in the process of injection molding through a dedicated fixture fixed components. But in order to meet the requirements of positioning and high precision components, this method requires a close tolerance; In addition, according to the application of this approach is not always can get the combination of high strength. For larger area, can use simple agglutination, or for the plastic parts processing thread screw thread connection. But the combination method of poor reliability and robustness.
in order to overcome these shortcomings, the researchers developed LIFTEC technology ( Laser induced combining technology) To improve the combination of between metal and plastic. Laser method similar to the traditional method. Traditional methods through induction or ultrasonic heating metal parts, plastic around to molten metal part, after cooling is formed between plastic and metal joint connection. LIFTEC technology is simple and effective, it USES the laser heating metal parts. In the simplest application, LIFTEC technology USES all the thermoplastic not coloring is transparent or translucent properties. After plastic parts laser focus on stay in combination with metal parts, cause local melting. Before combining the shape of the metal parts processing with a groove or hole, can further enhance the combination effect of the end.
the advantages of the technique on LIFTEC perhaps lies in its flexibility, it even can be used in the heat resistant materials (such as teflon As shown in figure) 。 This kind of opaque plastic and metal combination method, combined with laser focus after plastic parts on the stay of the metal parts is a little different: heating metal laser in the flank, and exactly on the plastic parts of metal on the surface, and then gradually into the plastic metal parts. Most importantly, LIFTEC technologies not only confined to the metal parts, can also be used for combination of ceramic and plastic. Graph: Germany's fraunhofer institute of laser technology research (laser induced in combination with technology LIFTEC） , this technology has realized the effective combination between different materials, such as steel and organic glass ( Above) , fluoro lung and organic glass ( The figure below) 。
LIFTEC technology ability recently was proved by the researchers, the researchers also reported a notable results: when the pin diameter is 2 mm, combined with the force of about 700 n.
compared with the existing technology, LIFTEC technology greatly reduced in the process of the combination of accuracy requirement, so the technology is expected to gain wide application in industry. In addition, induction heating and ultrasonic on the material's thermal conductivity has limits, while the use of laser radiation there is no such requirement. , the researchers said LIFTEC technology is expected to play a prominent role in some areas of the existing technical difficulties.
the current demo LIFTEC diode laser technology is using a low price. Because of the technology for the use of laser irradiation of the beam quality is not high, so fiber coupled laser diode must be used in the industrial application of this technology.
in order to further integration LIFTEC technology, ILT prestigious engineering specialized technology began to emerge. The researchers Holtkamp said: & other; We are looking to meet the specific process requirements of the machine. At present we adopt hydraulic equipment, but for the processing technology, the hydraulic pressure is too great and inaccurate. The new machine will be driven by electricity, can be placed on the table, this means that the optometrists will be able to use the equipment in the shop the lens and frame moment together. ”
ILT has obtained a patent for the technology, the technology and industrial circles began to have counseling. Now researchers are working to reduce the heating time, may be used in industrial applications and research of all kinds of binding force.