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Principle and application industry of plastic laser welding machine

by:J&D WATER     2020-02-27
Plastic laser welding machine is a kind of welding method that uses high energy density laser beam as heat source, that is, laser radiation heats the surface of the workpiece, and the surface heat diffuses to the inside through heat conduction to melt the workpiece, form a specific molten pool. As shown in Fig. 1, the laser beam passes through the upper layer of light-transmitting material and is then absorbed by the lower layer of material. After the laser energy is absorbed, it is converted into heat energy because the two layers of materials are pressed together. Heat energy is conducted from the absorption layer to the light-transmitting layer, so that the two layers of materials are melted and combined. Figure 1 plastic laser transmission welding principle it can be seen that the energy of the laser beam must be absorbed by the plastic to achieve a good welding effect, so the plastic laser welding machine generally uses a semiconductor laser. In addition, not all plastics can be welded by laser welding. Plastics can be divided into two categories: thermosetting and thermoplastic. Among them, thermosetting plastics do not have repeated formability and cannot be welded, while thermoplastic will melt after reheating ( Heating and cooling can be applied to make it produce reversible changes) , Is the so-called physical change, and therefore has weldability. Compared with other welding methods, laser welding has the characteristics of fast speed and good effect, and the generated mechanical stress and thermal stress are small, so it is especially suitable for precision electronic components such as mouse, mobile phone and connector, and complex parts that need to be welded in a cleaner way, such as plastic products containing circuit boards. Automobile, medical treatment, consumer electronics, food and other industries are all ideal application fields for laser welding. Plastic laser welding machine in automobile industry is widely used in automobile industry, such as automatic door lock, engine sensor, cab frame, fuel nozzle, gear shift frame, etc, the taillights of some models have also been welded by laser. The lamps welded by laser have good sealing performance, and there will be no water leakage, air leakage and other phenomena. The corrosion resistance of the weld is also very superior, moreover, its connection strength is higher and the durability of the lamp is better. Fig. 2 is a car taillight welded by laser. Fig. 2 laser welding of automobile lamps Fig. 3 is the automobile instrument panel and instrument cover welded by laser. The welding of automobile instrument panel requires high appearance and connection strength. The use of laser welding can not only ensure the performance and good appearance of the instrument panel, but also improve the designability of the instrument panel. Figure 3 automotive instrument panel and instrument cover in the medical field, the medical industry requires extremely high connection quality of plastics. Based on the characteristics of laser transmission welding, precision welding, micro-connection and environmental protection of welding products, plastic products are widely used in medical engineering industry, especially in the field of medical devices, a large number of products are welded by laser welding technology. These welds are usually required to be carried out in a clean environment, which is also the usual requirement of many clinics and hospitals, and laser welding can just meet this clean requirement, therefore, a large number of plastic medical devices are welded by plastic laser welding technology. Plastic laser welding machine can be used for humidification bottle, fetal detector, microfluidic chip, earwax protector, blood analyzer, etc. Fig. 4 is a medical welding sample. Figure 4 the welding of humidified bottle the plastic laser welding machine in household appliance industry can be used in household appliance industry, such as air-conditioner fan blades, liquid-cooled lamp, LED lamp, etc. Liquid cooling lamp welding laser welding plastic has the comprehensive advantages of low cost, no pollution, high speed, convenient processing, easy realization of precision numerical control, wide application range of raw materials, good bonding and manufacturability, etc, with the research on plastic welding process and the gradual commercialization of plastic laser welding equipment, the application of plastic laser welding will be more and more extensive and the technology will be more and more mature. In order to meet the growing demand for transparent plastic products in industrial, medical and scientific markets.
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