Fields of use in the ultrasonic welding technology industry
In the production of industrial products, some industrial materials are often used, such as plastic, metal, wood and other industrial materials. In daily life, we often see that a product is made with more than one type of material; we also often see When a product is composed of multiple parts, and there will be gaps between the parts, this will not only affect the quality of the product, but also affect the beauty of the product. This requires them to be welded to each other. Follow the skills With development, people's requirements for welding skills are getting higher and higher. At present, traditional welding skills are not only expensive, but the quality of welding is not high, and subtle gaps often occur. Therefore, people hope to use new ultrasonic welding machine skills to improve products. Quality. Provided by the Technical Department of Shanghai Huangrun Ultrasonic Technology Co., Ltd.
In 1943, on the basis of summarizing previous theories and practices, Behl in the United States invented ultrasonic welding, which has since promoted the development of ultrasonic welding skills. Because ultrasonic welding skills are energy-saving, there is no need to install smoke dissipation devices, and no welding accessories are required during welding. , Low cost, high efficiency, good sealing, easy to realize automatic production and other advantages, ultrasonic welding skills are developing faster and faster.
1. Current status of the use of ultrasonic welding skills in industrial products
In the fields of aerospace, nuclear energy industry, electronics industry and other industries with high precision requirements, it is difficult to meet the technical requirements using traditional welding skills, and the cost is high and the efficiency is low. At present, ultrasonic welding skills are used in all walks of life. All have good use, such as medical machinery, packaging, hardware and other occupations; there are many products that can be welded, such as auto parts, optical lenses, U disks, etc.
2. Principles and characteristics of ultrasonic welding skills
Ultrasonic is a sound wave with a frequency higher than 20000 Hz, so the energy is large. Ultrasonic welding is a special welding that uses the mechanical oscillation energy of the ultrasonic frequency (over 20000 Hz) to connect the same or dissimilar metals, semiconductors, plastics, and cermets. Method . When ultrasonic waves act on the surface of thermoplastic plastics, tens of thousands of high-frequency oscillations per second will occur. This kind of high-frequency oscillations reaching a certain amplitude will transmit ultrasonic energy to the welding area through the upper weldment. The welding area, that is, the acoustic resistance at the interface of the two welding is relatively large, so local high temperature will occur. And because of the poor thermal conductivity of plastic products, the collective energy cannot be emitted in time for a while, so the energy will gather in the welding area, causing two The contact surface of the plastic melts quickly, and after a certain amount of pressure is applied, it will fuse into one. When the ultrasound stops, let the pressure continue for a few seconds to solidify and shape, thus forming a strong molecular chain. So as to achieve the purpose of welding. When the metal is ultrasonically welded, neither the current is delivered to the workpiece nor the high temperature heat source is applied to the workpiece, but under the action of static pressure, the elastic oscillation energy is converted into the friction work between the workpiece interface, The deformation energy and the limited temperature rise make the metal atoms in the welding area instantly activated, and the molecules at the two-phase interface penetrate each other, and finally realize the solid state connection of the metal weldment. Provided by the Technical Department of Shanghai Huangrun Ultrasonic Technology Co., Ltd.
2.1 Strengths of ultrasonic welding skills
Compared with traditional welding skills, ultrasonic welding skills have the following advantages: (1) Fast welding speed, high welding accuracy, and high welding joint strength; (2) Wide welding scale, good stability, and small deformation of the workpiece after welding ; (3) The surface of the welding object is clean and beautiful, smooth and smooth; (4) When welding, no welding agent is needed, which will not pollute the workpiece and generate no harmful gas, so it is an environmentally friendly welding method; (5) When welding, only need to supply small power to perform welding, low energy consumption; (6) Simple operation, low cost, high efficiency, and good sealing.