The advantages of ultrasonic metal welding are fast, energy-saving, high fusion strength, good electrical conductivity, no spark, and near-cold processing; the disadvantage is that the welded metal parts should not be too thick (generally less than or equal to 5mm), and the solder joints should not be too large. Need to pressurize. Ultrasonic welding
A welding method in which two plastics are welded together due to the heat generated by the intermolecular friction of the thermoplastic under the action of ultrasonic vibration.
2, ultrasonic metal welding
The advantages of ultrasonic metal welding are fast, energy-saving, high fusion strength, good electrical conductivity, no spark, and near-cold processing; the disadvantage is that the welded metal parts should not be too thick (generally less than or equal to 5mm), and the solder joints should not be too large. Need to pressurize.
Ultrasonic metal welding is a mechanical process. During the welding process, no current flows through the weldment, and there is no welding arc such as electric welding mode. Since ultrasonic welding does not have problems such as heat conduction and electrical resistivity, Metal materials are undoubtedly an ideal metal welding equipment system for efficient welding of sheets of different thicknesses.
Advantages of ultrasonic welding
1. Ultrasonic plastic welding advantages: fast welding speed, high welding strength and good sealing; replace traditional welding/bonding process, low cost, clean and pollution-free and will not damage the workpiece; stable welding process, all welding parameters can pass The software system performs tracking and monitoring, and it is easy to eliminate and maintain the fault once it is found.
2, ultrasonic metal welding advantages: 1), welding materials do not melt, not fragile metal properties. 2), good electrical conductivity after welding, the resistance coefficient is extremely low or nearly zero. 3), the welding metal surface requirements are low, oxidation or plating can be welded. 4), welding time is short, no need for any flux, gas, solder. 5), welding without sparks, environmental protection and safety.
Ultrasonic metal welding for products
1) Nickel-metal hydride battery Nickel-metal hydride battery nickel mesh and nickel sheet inter-melting and nickel sheet inter-melting. 2) Lithium battery, polymer battery copper foil and nickel sheet are mutually melted, and aluminum foil and aluminum sheet are mutually melted. 3), the wires are mutually melted, and they are entangled into one and a plurality of mutually melted. 4), the wire and the name of the electronic components, contacts, connectors and mutual fusion. 5), the mutual melting of large-scale heat sinks, heat exchange fins, and honeycomb hearts of famous household appliances and automotive products. 6), electromagnetic switch, no fuse switch and other large current contacts, mutual melting of dissimilar metal pieces. 7) The sealing and cutting of the metal pipe can be water and airtight.
Ultrasonic welding principle of ultrasonic plastic welding
When ultrasonic waves act on the thermoplastic plastic contact surface, high-frequency vibrations of tens of thousands of times per second are generated. This high-frequency vibration reaches a certain amplitude, and the ultrasonic energy is transmitted to the weld zone through the upper weldment, because the weld zone is two At the interface of the welding, the sound resistance is large, so local high temperature is generated. Moreover, due to the poor thermal conductivity of the plastic, it can not be dissipated in time and gather in the weld zone, so that the contact faces of the two plastics melt rapidly, and after a certain pressure, they are integrated into one. When the ultrasonic wave stops, let the pressure last for a few seconds to solidify it, thus forming a strong molecular chain for welding purposes, the welding strength can be close to the strength of the raw material. The quality of ultrasonic plastic welding depends on the amplitude of the transducer welding head, the applied pressure and the welding time. The welding time and the welding head pressure can be adjusted. The amplitude is determined by the transducer and the horn. The interaction of these three quantities has a suitable value. When the energy exceeds the appropriate value, the melting amount of the plastic is large, and the welding material is easily deformed; if the energy is small, the welding is not easy, and the applied pressure is not too large. This optimum pressure is the product of the side length of the welded portion and the optimum pressure per 1 mm of the edge.
Ultrasonic welding application method
1. Welding method: The welding head vibrating at ultra-high frequency of ultrasonic wave makes the frictional heat of the joint surface of two plastics melt and join under moderate pressure. The welding strength can be compared with the body, using suitable workpiece and reasonable interface. Designed to achieve watertight and airtight, and to avoid the inconvenience caused by the use of auxiliary materials, to achieve efficient and clean welding.
Second, the rivet welding method: Ultrasonic ultra-high frequency vibration welding head, pressing the tip of the plastic product, so that it instantly melts into a rivet shape, so that the materials of different materials are mechanically riveted together.
3. Embedding: By means of the trajectory of the welding head and appropriate pressure, metal parts (such as nuts, screws, etc.) are squeezed into the plastic hole and fixed at a certain depth. After completion, the tension and torque can be comparable. The strength of the traditional mold forming can eliminate the disadvantages of the injection mold being damaged and the injection being slow.
4. Molding: This method is similar to the rivet welding method in that a concave horn is pressed against the outer ring of the plastic product, and the ultrasonic wave is ultrasonically fused after the ultrasonic wave is ultrasonically welded, and the metal object is coated and fixed. The appearance is smooth and beautiful, and the method is mostly used in the fixed forming of electronic products and horns, and the fixing of lenses for cosmetics.
V. Spot welding: A. Weld the two plastic points without pre-designing the welding wire to achieve the purpose of welding. B. For relatively large workpieces, it is not easy to design the workpiece of the welding wire for point welding, and the welding effect can be achieved, and multiple points can be spot welded at the same time.
Sixth, cutting and sealing: Using the principle of ultrasonic vibration for instant vibration, the chemical fiber fabric is cut, and its advantages are smooth and not cracked or drawn.
Ultrasonic metal welding machine (Nike Ultrasonic Wang Qiang)
The principle of ultrasonic metal welding is a special method of connecting the same metal or dissimilar metal by using the mechanical vibration energy of ultrasonic frequency (over 16KHz). When the metal is ultrasonically welded, neither the current is supplied to the workpiece nor the high temperature heat source is applied to the workpiece, but the vibration energy of the frame is converted into the friction work, the deformation energy and the limited temperature rise of the work chamber under static pressure. The metallurgical bond between the joints is a solid state welding realized without the base material melting. Therefore, it effectively overcomes the phenomenon of spatter and oxidation generated during resistance welding. Ultrasonic metal welding machine can perform single point welding, multi-point welding and short strip welding on filament or sheet material of non-ferrous metals such as copper, silver, aluminum and nickel. Can be widely used in thyristor leads, fuse sheets, electrical leads, lithium battery pole pieces, pole welding.
Ultrasonic welding application
For all application markets, ultrasonic welding has its unique advantages - fast, efficient, clean and robust, and has earned recognition in all walks of life.
First, the car: (transportation industry) Ultrasonic can be controlled by computer program to control the welding of large and irregular workpieces such as: bumper, front and rear doors, lamps, brake lights and so on. With the development of high-grade roads, anti-reflective films are also increasingly using ultrasonic welding.
Second, home appliances: Through appropriate adjustments can be used: portable fluorescent lamp cover, steam ironing door, TV casing, recording, sound machine transparent panel, power rectifier, TV shell screw holder, mosquito lamp housing, washing machine dewatering tank, etc. Sealed, strong and beautiful home appliances.
Third, the packaging: the sealing of the hose, the connection of the special packing belt.
Fourth, the toy industry: Due to the use of ultrasonic technology to make the product clean, efficient and firm, eliminating the use of screws, adhesives, glue or other ancillary products, reducing production costs, so that the competitiveness of enterprises in the market is greatly enhanced.
V. Electronics: The use of automation solutions allows users to achieve large-scale production while ensuring the quality of products.
6. Other commercial uses: From communication equipment, computer industry, printing equipment to audio-visual products, you can use Minghe ultrasonic equipment, which brings you simple, clean and efficient production methods, bringing you more opportunity.
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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