Ultrasonic welding technology
High-power ultrasonic technology is based on physics, electronics, mechanical vibration, materials and other disciplines as one of the modern high-tech, it is the energy to make the object or the physical nature of the change in the power of the application of the national economy, it is to improve the quality of the product, reduce production costs, improve productivity, and to prevent environmental pollution has a special potential ability. In the past 10 years, with the development of microelectronics technology, new materials, so that the generation of high-power ultrasound, the basic effects of research and technical applications have made greater progress in the plea according to foreign reports know that the power of ultrasound generated by the social and economic benefits of the growth rate is quite alarming, in 1995, the output value of ultrasonic cleaners 2.8 billion U.S. dollars, ultrasonic plastic welding 200 million U.S. dollars, the domestic power ultrasound output value of 167 million yuan! Domestic some of the traditional ultrasonic cleaner, welding, processing and other equipment development, sales are also booming, in recent years the development of new technologies and their applications such as acoustic chemistry, ultrasonic motors, environmental protection governance, ultrasound therapy is also very active in the following on the power of ultrasound a few major aspects of the technology and application of the introduction.
Ultrasonic welding technology is divided into two kinds of metal welding and plastic welding, its function, the principle is slightly different, but the basic equipment or ultrasonic generator and transducer vibration system.
Metal welding spot welding seam welding butt welding, etc., ultrasonic technology is widely used in aluminum, aluminum foil, copper plate welding and silicon wires and metal wires, capacitor leads connected to the coal electronics industry in the spot welding is generally less powerful, in dozens of W or a few W or less, while the seam welding and butt welding power is larger, in the hundreds of W or even dozens of kW}According to the Japanese report with two up and down the vibration system for butt welding, the frequency of 27kHz, power 3kW can be used for the welding, the power of 3kW can be used for the welding, the power of 3kW can be used for the welding. The power of 3kW can weld 10mm thick aluminum plate, its welding strength up to the strength of the weld itself ultrasonic seam welding is currently mainly used in thin plate 1mm or 0.5mm below the aluminum pipe welding this welding is continuous welding, so the requirements of the vibration system with small loss, good reliability.
Ultrasonic welding technology is ultrasonic through the welding head added to the junction of the two surfaces to be welded, due to the acoustic resistance at the interface and therefore produce a localized high temperature gathered in the weld area, resulting in the interface at the rapid melting of the plastic, under a certain pressure, the two weldments synthesized into a single piece of the rapid development of the plastics industry and the plastic weld without the addition of any binders, fillers, or solvents, do not contaminate the environment, and therefore is widely used in aviation, Automotive, electrical appliances, instrumentation, packaging, toys, electronics, medical equipment, clothing and other industries ultrasonic welding machine quality and weldments at the interface of the ultrasonic energy, pressure, welding time, the correct mastery of the relationship between the three is the key to weld the strength of the microcomputer-controlled ultrasonic welding machine according to the state of the state of the nature of the weldments, automatic control of the generator's output power, the pressure of weldments and the welding time, and other parameters to enable Reach the optimal welding state, when the parameters do not adapt to the automatic alarm or shutdown currently welding large-sized workpiece, due to the large cross-section welding head by the influence of transverse vibration, its amplitude distribution is quite critical, the correct design of the vibration system, especially the head of the tool is an ultrasonic plastic welder success or failure factors sometimes require multiple welding pieces of this sub-mother type of weld head should be designed into a half-wavelength or full-wavelength, when the multiple weld surface in the same plane and the spacing is small take half-wavelength or full-wavelength. When multiple welding surfaces in the same plane and the spacing is small take half-wavelength, when the spacing is large can take the full wavelength of the current ultrasonic plastic welder and its frequency used in most of the 15 ~ 40kHz, for some of the melting point of the higher polyester film class can be used at a higher frequency, and even up to 300kHz left state with the plastic instead of steel to save metal materials and reduce the weight of ultrasonic welding technology application areas and market prospects, the ultrasonic welding technology is a good choice for the market. Welding technology applications and market prospects are encouraging.