Views: 0 Author: HanTenCNC Publish Time: 2022-01-03 Origin: Site
In recent years, with the expansion of the global automotive market demand, while the process of automotive intelligence is accelerating, advanced manufacturing technology represented by laser technology is also constantly promoting the upgrading of the automotive manufacturing industry. The laser welding process of car lights is in the field of car lights. It also develops rapidly.
The laser welding process for car lights has only become popular in recent years. Nowadays, OEMs have higher and higher requirements for the shape of the taillights, and the taillights tend to be more and more complicated. Friction welding has a relatively large impact on the appearance of parts, and the friction welding process has gradually been unable to meet the requirements of precision taillight parts. Hot plate welding is an earlier and simplest welding technology in plastic welding technology. With the development of technology, at present, the most commonly used welding methods in the manufacture of car lights are vibration friction welding and ultrasonic welding. In addition, there is laser welding technology that has received more and more attention. In the comparison of various welding technologies, it is not difficult to see that plastic laser welding has the characteristics of beautiful welding seams, flexible welding, and high strength, and has become a "potential stock" in automotive lamp welding technology. Therefore, laser welding conforms to the trend and has become a new choice for the welding process of automobile lights in the future.
The more common laser welding methods include track laser welding, synchronous laser welding, and quasi-synchronous laser welding. Track laser welding is also known as sequential axis welding. It refers to the welding completed by the relative movement of the weldment and the laser beam according to a predetermined route. With the movement of the laser beam, the welding material melts and then cools and solidifies to complete the welding. The movement of the laser beam can be done by a robot. This laser welding method reduces processing costs and reduces process damage. The unit cost of this plastic welding technology is extremely low, so it saves money.
Synchronous laser welding means that the weld is heated by multiple laser beams at the same time. Synchronous welding has no limitation on the length of the welding seam, and the welding seam can also be not on the same plane, which is suitable for mass production. As long as the pressure of the fixture can be evenly distributed along the entire weld. Synchronous welding can well complete the welding on the same plane, if it is a curve welding of a complex curved surface. Need to add beam shaping parts. By controlling and adjusting the beam shaping components, the laser energy is evenly distributed throughout the length of the weld.
The principle of laser welding of car lights is as follows. During the welding process, two different plastic products are clamped together under pressure. An optical path system composed of mirrors, lenses or optical fibers. Focusing the beam generated by the laser on the area to be welded, the laser passes through the transmissive material above, and is then absorbed by the absorbing material below, and converts light energy into heat energy, so that the absorbing material below heats up. And transfer the heat to the transmissive material above. A welding zone is formed at the contact surface of the two materials. During the subsequent solidification process, the melted material forms a joint. The two materials to be welded are connected.
The lampshade and the shell of the car light are two different materials. In order to achieve laser welding, the lampshade material must be able to have a very high transmittance to the laser. The shell material must have a very high absorption rate for the laser. Before welding, make sure that there are no pits and bumps between the lampshade and the housing. When there are pits and bumps between the lampshade and the housing, there will be a gap between the two. And this kind of gap cannot be removed by means of pressure. When the laser is irradiated on the surface of the shell welding ribs, the heat generated by the shell welding ribs cannot be transferred to the lampshade due to the existence of the gap, which causes the temperature of the shell welding ribs at the gap to be too high and carbonization occurs, which affects the appearance of the whole lamp. In severe cases, the air-tightness of the entire lamp will be affected.
Car headlights, also known as car headlights, car led daytime running lights, as the eyes of a car, are not only related to the external image of a car owner, but also closely related to driving at night or safe driving under bad weather conditions. In the manufacture of automobile headlights, it is generally composed of lamp beads, heat sink, circular base and fan, and the connection of lamp beads, heat sink and base is generally realized by welding several components of the car light. In the trimming of car lights, a handheld laser welding device is generally used to fix the connection part, but the welding head part in the hand-held part is easy to shake, resulting in poor connection of the welding position.
In order to solve the problems in the existing welding technology of automobile taillights, headlights and lampshades, we recommend using HANTENCNC platform welding machine.